Commit | Line | Data |
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3993f6b1 | 1 | /* GNU/Linux native-dependent code common to multiple platforms. |
dba24537 | 2 | |
0fb0cc75 | 3 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
e26af52f | 4 | Free Software Foundation, Inc. |
3993f6b1 DJ |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
3993f6b1 DJ |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
3993f6b1 DJ |
20 | |
21 | #include "defs.h" | |
22 | #include "inferior.h" | |
23 | #include "target.h" | |
d6b0e80f | 24 | #include "gdb_string.h" |
3993f6b1 | 25 | #include "gdb_wait.h" |
d6b0e80f AC |
26 | #include "gdb_assert.h" |
27 | #ifdef HAVE_TKILL_SYSCALL | |
28 | #include <unistd.h> | |
29 | #include <sys/syscall.h> | |
30 | #endif | |
3993f6b1 | 31 | #include <sys/ptrace.h> |
0274a8ce | 32 | #include "linux-nat.h" |
ac264b3b | 33 | #include "linux-fork.h" |
d6b0e80f AC |
34 | #include "gdbthread.h" |
35 | #include "gdbcmd.h" | |
36 | #include "regcache.h" | |
4f844a66 | 37 | #include "regset.h" |
10d6c8cd DJ |
38 | #include "inf-ptrace.h" |
39 | #include "auxv.h" | |
dba24537 AC |
40 | #include <sys/param.h> /* for MAXPATHLEN */ |
41 | #include <sys/procfs.h> /* for elf_gregset etc. */ | |
42 | #include "elf-bfd.h" /* for elfcore_write_* */ | |
43 | #include "gregset.h" /* for gregset */ | |
44 | #include "gdbcore.h" /* for get_exec_file */ | |
45 | #include <ctype.h> /* for isdigit */ | |
46 | #include "gdbthread.h" /* for struct thread_info etc. */ | |
47 | #include "gdb_stat.h" /* for struct stat */ | |
48 | #include <fcntl.h> /* for O_RDONLY */ | |
b84876c2 PA |
49 | #include "inf-loop.h" |
50 | #include "event-loop.h" | |
51 | #include "event-top.h" | |
07e059b5 VP |
52 | #include <pwd.h> |
53 | #include <sys/types.h> | |
54 | #include "gdb_dirent.h" | |
55 | #include "xml-support.h" | |
dba24537 | 56 | |
10568435 JK |
57 | #ifdef HAVE_PERSONALITY |
58 | # include <sys/personality.h> | |
59 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
60 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
61 | # endif | |
62 | #endif /* HAVE_PERSONALITY */ | |
63 | ||
8a77dff3 VP |
64 | /* This comment documents high-level logic of this file. |
65 | ||
66 | Waiting for events in sync mode | |
67 | =============================== | |
68 | ||
69 | When waiting for an event in a specific thread, we just use waitpid, passing | |
70 | the specific pid, and not passing WNOHANG. | |
71 | ||
72 | When waiting for an event in all threads, waitpid is not quite good. Prior to | |
73 | version 2.4, Linux can either wait for event in main thread, or in secondary | |
74 | threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might | |
75 | miss an event. The solution is to use non-blocking waitpid, together with | |
76 | sigsuspend. First, we use non-blocking waitpid to get an event in the main | |
77 | process, if any. Second, we use non-blocking waitpid with the __WCLONED | |
78 | flag to check for events in cloned processes. If nothing is found, we use | |
79 | sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something | |
80 | happened to a child process -- and SIGCHLD will be delivered both for events | |
81 | in main debugged process and in cloned processes. As soon as we know there's | |
82 | an event, we get back to calling nonblocking waitpid with and without __WCLONED. | |
83 | ||
84 | Note that SIGCHLD should be blocked between waitpid and sigsuspend calls, | |
85 | so that we don't miss a signal. If SIGCHLD arrives in between, when it's | |
86 | blocked, the signal becomes pending and sigsuspend immediately | |
87 | notices it and returns. | |
88 | ||
89 | Waiting for events in async mode | |
90 | ================================ | |
91 | ||
7feb7d06 PA |
92 | In async mode, GDB should always be ready to handle both user input |
93 | and target events, so neither blocking waitpid nor sigsuspend are | |
94 | viable options. Instead, we should asynchronously notify the GDB main | |
95 | event loop whenever there's an unprocessed event from the target. We | |
96 | detect asynchronous target events by handling SIGCHLD signals. To | |
97 | notify the event loop about target events, the self-pipe trick is used | |
98 | --- a pipe is registered as waitable event source in the event loop, | |
99 | the event loop select/poll's on the read end of this pipe (as well on | |
100 | other event sources, e.g., stdin), and the SIGCHLD handler writes a | |
101 | byte to this pipe. This is more portable than relying on | |
102 | pselect/ppoll, since on kernels that lack those syscalls, libc | |
103 | emulates them with select/poll+sigprocmask, and that is racy | |
104 | (a.k.a. plain broken). | |
105 | ||
106 | Obviously, if we fail to notify the event loop if there's a target | |
107 | event, it's bad. OTOH, if we notify the event loop when there's no | |
108 | event from the target, linux_nat_wait will detect that there's no real | |
109 | event to report, and return event of type TARGET_WAITKIND_IGNORE. | |
110 | This is mostly harmless, but it will waste time and is better avoided. | |
111 | ||
112 | The main design point is that every time GDB is outside linux-nat.c, | |
113 | we have a SIGCHLD handler installed that is called when something | |
114 | happens to the target and notifies the GDB event loop. Whenever GDB | |
115 | core decides to handle the event, and calls into linux-nat.c, we | |
116 | process things as in sync mode, except that the we never block in | |
117 | sigsuspend. | |
118 | ||
119 | While processing an event, we may end up momentarily blocked in | |
120 | waitpid calls. Those waitpid calls, while blocking, are guarantied to | |
121 | return quickly. E.g., in all-stop mode, before reporting to the core | |
122 | that an LWP hit a breakpoint, all LWPs are stopped by sending them | |
123 | SIGSTOP, and synchronously waiting for the SIGSTOP to be reported. | |
124 | Note that this is different from blocking indefinitely waiting for the | |
125 | next event --- here, we're already handling an event. | |
8a77dff3 VP |
126 | |
127 | Use of signals | |
128 | ============== | |
129 | ||
130 | We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another | |
131 | signal is not entirely significant; we just need for a signal to be delivered, | |
132 | so that we can intercept it. SIGSTOP's advantage is that it can not be | |
133 | blocked. A disadvantage is that it is not a real-time signal, so it can only | |
134 | be queued once; we do not keep track of other sources of SIGSTOP. | |
135 | ||
136 | Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't | |
137 | use them, because they have special behavior when the signal is generated - | |
138 | not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL | |
139 | kills the entire thread group. | |
140 | ||
141 | A delivered SIGSTOP would stop the entire thread group, not just the thread we | |
142 | tkill'd. But we never let the SIGSTOP be delivered; we always intercept and | |
143 | cancel it (by PTRACE_CONT without passing SIGSTOP). | |
144 | ||
145 | We could use a real-time signal instead. This would solve those problems; we | |
146 | could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB. | |
147 | But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH | |
148 | generates it, and there are races with trying to find a signal that is not | |
149 | blocked. */ | |
a0ef4274 | 150 | |
dba24537 AC |
151 | #ifndef O_LARGEFILE |
152 | #define O_LARGEFILE 0 | |
153 | #endif | |
0274a8ce | 154 | |
3993f6b1 DJ |
155 | /* If the system headers did not provide the constants, hard-code the normal |
156 | values. */ | |
157 | #ifndef PTRACE_EVENT_FORK | |
158 | ||
159 | #define PTRACE_SETOPTIONS 0x4200 | |
160 | #define PTRACE_GETEVENTMSG 0x4201 | |
161 | ||
162 | /* options set using PTRACE_SETOPTIONS */ | |
163 | #define PTRACE_O_TRACESYSGOOD 0x00000001 | |
164 | #define PTRACE_O_TRACEFORK 0x00000002 | |
165 | #define PTRACE_O_TRACEVFORK 0x00000004 | |
166 | #define PTRACE_O_TRACECLONE 0x00000008 | |
167 | #define PTRACE_O_TRACEEXEC 0x00000010 | |
9016a515 DJ |
168 | #define PTRACE_O_TRACEVFORKDONE 0x00000020 |
169 | #define PTRACE_O_TRACEEXIT 0x00000040 | |
3993f6b1 DJ |
170 | |
171 | /* Wait extended result codes for the above trace options. */ | |
172 | #define PTRACE_EVENT_FORK 1 | |
173 | #define PTRACE_EVENT_VFORK 2 | |
174 | #define PTRACE_EVENT_CLONE 3 | |
175 | #define PTRACE_EVENT_EXEC 4 | |
c874c7fc | 176 | #define PTRACE_EVENT_VFORK_DONE 5 |
9016a515 | 177 | #define PTRACE_EVENT_EXIT 6 |
3993f6b1 DJ |
178 | |
179 | #endif /* PTRACE_EVENT_FORK */ | |
180 | ||
181 | /* We can't always assume that this flag is available, but all systems | |
182 | with the ptrace event handlers also have __WALL, so it's safe to use | |
183 | here. */ | |
184 | #ifndef __WALL | |
185 | #define __WALL 0x40000000 /* Wait for any child. */ | |
186 | #endif | |
187 | ||
02d3ff8c | 188 | #ifndef PTRACE_GETSIGINFO |
1ef18d08 PA |
189 | # define PTRACE_GETSIGINFO 0x4202 |
190 | # define PTRACE_SETSIGINFO 0x4203 | |
02d3ff8c UW |
191 | #endif |
192 | ||
10d6c8cd DJ |
193 | /* The single-threaded native GNU/Linux target_ops. We save a pointer for |
194 | the use of the multi-threaded target. */ | |
195 | static struct target_ops *linux_ops; | |
f973ed9c | 196 | static struct target_ops linux_ops_saved; |
10d6c8cd | 197 | |
9f0bdab8 DJ |
198 | /* The method to call, if any, when a new thread is attached. */ |
199 | static void (*linux_nat_new_thread) (ptid_t); | |
200 | ||
5b009018 PA |
201 | /* The method to call, if any, when the siginfo object needs to be |
202 | converted between the layout returned by ptrace, and the layout in | |
203 | the architecture of the inferior. */ | |
204 | static int (*linux_nat_siginfo_fixup) (struct siginfo *, | |
205 | gdb_byte *, | |
206 | int); | |
207 | ||
ac264b3b MS |
208 | /* The saved to_xfer_partial method, inherited from inf-ptrace.c. |
209 | Called by our to_xfer_partial. */ | |
210 | static LONGEST (*super_xfer_partial) (struct target_ops *, | |
211 | enum target_object, | |
212 | const char *, gdb_byte *, | |
213 | const gdb_byte *, | |
10d6c8cd DJ |
214 | ULONGEST, LONGEST); |
215 | ||
d6b0e80f | 216 | static int debug_linux_nat; |
920d2a44 AC |
217 | static void |
218 | show_debug_linux_nat (struct ui_file *file, int from_tty, | |
219 | struct cmd_list_element *c, const char *value) | |
220 | { | |
221 | fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"), | |
222 | value); | |
223 | } | |
d6b0e80f | 224 | |
b84876c2 PA |
225 | static int debug_linux_nat_async = 0; |
226 | static void | |
227 | show_debug_linux_nat_async (struct ui_file *file, int from_tty, | |
228 | struct cmd_list_element *c, const char *value) | |
229 | { | |
230 | fprintf_filtered (file, _("Debugging of GNU/Linux async lwp module is %s.\n"), | |
231 | value); | |
232 | } | |
233 | ||
10568435 JK |
234 | static int disable_randomization = 1; |
235 | ||
236 | static void | |
237 | show_disable_randomization (struct ui_file *file, int from_tty, | |
238 | struct cmd_list_element *c, const char *value) | |
239 | { | |
240 | #ifdef HAVE_PERSONALITY | |
241 | fprintf_filtered (file, _("\ | |
242 | Disabling randomization of debuggee's virtual address space is %s.\n"), | |
243 | value); | |
244 | #else /* !HAVE_PERSONALITY */ | |
245 | fputs_filtered (_("\ | |
246 | Disabling randomization of debuggee's virtual address space is unsupported on\n\ | |
247 | this platform.\n"), file); | |
248 | #endif /* !HAVE_PERSONALITY */ | |
249 | } | |
250 | ||
251 | static void | |
252 | set_disable_randomization (char *args, int from_tty, struct cmd_list_element *c) | |
253 | { | |
254 | #ifndef HAVE_PERSONALITY | |
255 | error (_("\ | |
256 | Disabling randomization of debuggee's virtual address space is unsupported on\n\ | |
257 | this platform.")); | |
258 | #endif /* !HAVE_PERSONALITY */ | |
259 | } | |
260 | ||
9016a515 DJ |
261 | static int linux_parent_pid; |
262 | ||
ae087d01 DJ |
263 | struct simple_pid_list |
264 | { | |
265 | int pid; | |
3d799a95 | 266 | int status; |
ae087d01 DJ |
267 | struct simple_pid_list *next; |
268 | }; | |
269 | struct simple_pid_list *stopped_pids; | |
270 | ||
3993f6b1 DJ |
271 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK |
272 | can not be used, 1 if it can. */ | |
273 | ||
274 | static int linux_supports_tracefork_flag = -1; | |
275 | ||
9016a515 DJ |
276 | /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have |
277 | PTRACE_O_TRACEVFORKDONE. */ | |
278 | ||
279 | static int linux_supports_tracevforkdone_flag = -1; | |
280 | ||
b84876c2 PA |
281 | /* Async mode support */ |
282 | ||
b84876c2 PA |
283 | /* Zero if the async mode, although enabled, is masked, which means |
284 | linux_nat_wait should behave as if async mode was off. */ | |
285 | static int linux_nat_async_mask_value = 1; | |
286 | ||
287 | /* The read/write ends of the pipe registered as waitable file in the | |
288 | event loop. */ | |
289 | static int linux_nat_event_pipe[2] = { -1, -1 }; | |
290 | ||
7feb7d06 | 291 | /* Flush the event pipe. */ |
b84876c2 | 292 | |
7feb7d06 PA |
293 | static void |
294 | async_file_flush (void) | |
b84876c2 | 295 | { |
7feb7d06 PA |
296 | int ret; |
297 | char buf; | |
b84876c2 | 298 | |
7feb7d06 | 299 | do |
b84876c2 | 300 | { |
7feb7d06 | 301 | ret = read (linux_nat_event_pipe[0], &buf, 1); |
b84876c2 | 302 | } |
7feb7d06 | 303 | while (ret >= 0 || (ret == -1 && errno == EINTR)); |
b84876c2 PA |
304 | } |
305 | ||
7feb7d06 PA |
306 | /* Put something (anything, doesn't matter what, or how much) in event |
307 | pipe, so that the select/poll in the event-loop realizes we have | |
308 | something to process. */ | |
252fbfc8 | 309 | |
b84876c2 | 310 | static void |
7feb7d06 | 311 | async_file_mark (void) |
b84876c2 | 312 | { |
7feb7d06 | 313 | int ret; |
b84876c2 | 314 | |
7feb7d06 PA |
315 | /* It doesn't really matter what the pipe contains, as long we end |
316 | up with something in it. Might as well flush the previous | |
317 | left-overs. */ | |
318 | async_file_flush (); | |
b84876c2 | 319 | |
7feb7d06 | 320 | do |
b84876c2 | 321 | { |
7feb7d06 | 322 | ret = write (linux_nat_event_pipe[1], "+", 1); |
b84876c2 | 323 | } |
7feb7d06 | 324 | while (ret == -1 && errno == EINTR); |
b84876c2 | 325 | |
7feb7d06 PA |
326 | /* Ignore EAGAIN. If the pipe is full, the event loop will already |
327 | be awakened anyway. */ | |
b84876c2 PA |
328 | } |
329 | ||
7feb7d06 PA |
330 | static void linux_nat_async (void (*callback) |
331 | (enum inferior_event_type event_type, void *context), | |
332 | void *context); | |
333 | static int linux_nat_async_mask (int mask); | |
334 | static int kill_lwp (int lwpid, int signo); | |
335 | ||
336 | static int stop_callback (struct lwp_info *lp, void *data); | |
337 | ||
338 | static void block_child_signals (sigset_t *prev_mask); | |
339 | static void restore_child_signals_mask (sigset_t *prev_mask); | |
ae087d01 DJ |
340 | \f |
341 | /* Trivial list manipulation functions to keep track of a list of | |
342 | new stopped processes. */ | |
343 | static void | |
3d799a95 | 344 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) |
ae087d01 DJ |
345 | { |
346 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
347 | new_pid->pid = pid; | |
3d799a95 | 348 | new_pid->status = status; |
ae087d01 DJ |
349 | new_pid->next = *listp; |
350 | *listp = new_pid; | |
351 | } | |
352 | ||
353 | static int | |
3d799a95 | 354 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *status) |
ae087d01 DJ |
355 | { |
356 | struct simple_pid_list **p; | |
357 | ||
358 | for (p = listp; *p != NULL; p = &(*p)->next) | |
359 | if ((*p)->pid == pid) | |
360 | { | |
361 | struct simple_pid_list *next = (*p)->next; | |
3d799a95 | 362 | *status = (*p)->status; |
ae087d01 DJ |
363 | xfree (*p); |
364 | *p = next; | |
365 | return 1; | |
366 | } | |
367 | return 0; | |
368 | } | |
369 | ||
3d799a95 DJ |
370 | static void |
371 | linux_record_stopped_pid (int pid, int status) | |
ae087d01 | 372 | { |
3d799a95 | 373 | add_to_pid_list (&stopped_pids, pid, status); |
ae087d01 DJ |
374 | } |
375 | ||
3993f6b1 DJ |
376 | \f |
377 | /* A helper function for linux_test_for_tracefork, called after fork (). */ | |
378 | ||
379 | static void | |
380 | linux_tracefork_child (void) | |
381 | { | |
382 | int ret; | |
383 | ||
384 | ptrace (PTRACE_TRACEME, 0, 0, 0); | |
385 | kill (getpid (), SIGSTOP); | |
386 | fork (); | |
48bb3cce | 387 | _exit (0); |
3993f6b1 DJ |
388 | } |
389 | ||
7feb7d06 | 390 | /* Wrapper function for waitpid which handles EINTR. */ |
b957e937 DJ |
391 | |
392 | static int | |
393 | my_waitpid (int pid, int *status, int flags) | |
394 | { | |
395 | int ret; | |
b84876c2 | 396 | |
b957e937 DJ |
397 | do |
398 | { | |
399 | ret = waitpid (pid, status, flags); | |
400 | } | |
401 | while (ret == -1 && errno == EINTR); | |
402 | ||
403 | return ret; | |
404 | } | |
405 | ||
406 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. | |
407 | ||
408 | First, we try to enable fork tracing on ORIGINAL_PID. If this fails, | |
409 | we know that the feature is not available. This may change the tracing | |
410 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. | |
411 | ||
412 | However, if it succeeds, we don't know for sure that the feature is | |
413 | available; old versions of PTRACE_SETOPTIONS ignored unknown options. We | |
3993f6b1 | 414 | create a child process, attach to it, use PTRACE_SETOPTIONS to enable |
b957e937 DJ |
415 | fork tracing, and let it fork. If the process exits, we assume that we |
416 | can't use TRACEFORK; if we get the fork notification, and we can extract | |
417 | the new child's PID, then we assume that we can. */ | |
3993f6b1 DJ |
418 | |
419 | static void | |
b957e937 | 420 | linux_test_for_tracefork (int original_pid) |
3993f6b1 DJ |
421 | { |
422 | int child_pid, ret, status; | |
423 | long second_pid; | |
7feb7d06 | 424 | sigset_t prev_mask; |
4c28f408 | 425 | |
7feb7d06 PA |
426 | /* We don't want those ptrace calls to be interrupted. */ |
427 | block_child_signals (&prev_mask); | |
3993f6b1 | 428 | |
b957e937 DJ |
429 | linux_supports_tracefork_flag = 0; |
430 | linux_supports_tracevforkdone_flag = 0; | |
431 | ||
432 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK); | |
433 | if (ret != 0) | |
7feb7d06 PA |
434 | { |
435 | restore_child_signals_mask (&prev_mask); | |
436 | return; | |
437 | } | |
b957e937 | 438 | |
3993f6b1 DJ |
439 | child_pid = fork (); |
440 | if (child_pid == -1) | |
e2e0b3e5 | 441 | perror_with_name (("fork")); |
3993f6b1 DJ |
442 | |
443 | if (child_pid == 0) | |
444 | linux_tracefork_child (); | |
445 | ||
b957e937 | 446 | ret = my_waitpid (child_pid, &status, 0); |
3993f6b1 | 447 | if (ret == -1) |
e2e0b3e5 | 448 | perror_with_name (("waitpid")); |
3993f6b1 | 449 | else if (ret != child_pid) |
8a3fe4f8 | 450 | error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret); |
3993f6b1 | 451 | if (! WIFSTOPPED (status)) |
8a3fe4f8 | 452 | error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), status); |
3993f6b1 | 453 | |
3993f6b1 DJ |
454 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); |
455 | if (ret != 0) | |
456 | { | |
b957e937 DJ |
457 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
458 | if (ret != 0) | |
459 | { | |
8a3fe4f8 | 460 | warning (_("linux_test_for_tracefork: failed to kill child")); |
7feb7d06 | 461 | restore_child_signals_mask (&prev_mask); |
b957e937 DJ |
462 | return; |
463 | } | |
464 | ||
465 | ret = my_waitpid (child_pid, &status, 0); | |
466 | if (ret != child_pid) | |
8a3fe4f8 | 467 | warning (_("linux_test_for_tracefork: failed to wait for killed child")); |
b957e937 | 468 | else if (!WIFSIGNALED (status)) |
8a3fe4f8 AC |
469 | warning (_("linux_test_for_tracefork: unexpected wait status 0x%x from " |
470 | "killed child"), status); | |
b957e937 | 471 | |
7feb7d06 | 472 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
473 | return; |
474 | } | |
475 | ||
9016a515 DJ |
476 | /* Check whether PTRACE_O_TRACEVFORKDONE is available. */ |
477 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, | |
478 | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE); | |
479 | linux_supports_tracevforkdone_flag = (ret == 0); | |
480 | ||
b957e937 DJ |
481 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); |
482 | if (ret != 0) | |
8a3fe4f8 | 483 | warning (_("linux_test_for_tracefork: failed to resume child")); |
b957e937 DJ |
484 | |
485 | ret = my_waitpid (child_pid, &status, 0); | |
486 | ||
3993f6b1 DJ |
487 | if (ret == child_pid && WIFSTOPPED (status) |
488 | && status >> 16 == PTRACE_EVENT_FORK) | |
489 | { | |
490 | second_pid = 0; | |
491 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
492 | if (ret == 0 && second_pid != 0) | |
493 | { | |
494 | int second_status; | |
495 | ||
496 | linux_supports_tracefork_flag = 1; | |
b957e937 DJ |
497 | my_waitpid (second_pid, &second_status, 0); |
498 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
499 | if (ret != 0) | |
8a3fe4f8 | 500 | warning (_("linux_test_for_tracefork: failed to kill second child")); |
97725dc4 | 501 | my_waitpid (second_pid, &status, 0); |
3993f6b1 DJ |
502 | } |
503 | } | |
b957e937 | 504 | else |
8a3fe4f8 AC |
505 | warning (_("linux_test_for_tracefork: unexpected result from waitpid " |
506 | "(%d, status 0x%x)"), ret, status); | |
3993f6b1 | 507 | |
b957e937 DJ |
508 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
509 | if (ret != 0) | |
8a3fe4f8 | 510 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 | 511 | my_waitpid (child_pid, &status, 0); |
4c28f408 | 512 | |
7feb7d06 | 513 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
514 | } |
515 | ||
516 | /* Return non-zero iff we have tracefork functionality available. | |
517 | This function also sets linux_supports_tracefork_flag. */ | |
518 | ||
519 | static int | |
b957e937 | 520 | linux_supports_tracefork (int pid) |
3993f6b1 DJ |
521 | { |
522 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 523 | linux_test_for_tracefork (pid); |
3993f6b1 DJ |
524 | return linux_supports_tracefork_flag; |
525 | } | |
526 | ||
9016a515 | 527 | static int |
b957e937 | 528 | linux_supports_tracevforkdone (int pid) |
9016a515 DJ |
529 | { |
530 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 531 | linux_test_for_tracefork (pid); |
9016a515 DJ |
532 | return linux_supports_tracevforkdone_flag; |
533 | } | |
534 | ||
3993f6b1 | 535 | \f |
4de4c07c DJ |
536 | void |
537 | linux_enable_event_reporting (ptid_t ptid) | |
538 | { | |
d3587048 | 539 | int pid = ptid_get_lwp (ptid); |
4de4c07c DJ |
540 | int options; |
541 | ||
d3587048 DJ |
542 | if (pid == 0) |
543 | pid = ptid_get_pid (ptid); | |
544 | ||
b957e937 | 545 | if (! linux_supports_tracefork (pid)) |
4de4c07c DJ |
546 | return; |
547 | ||
a2f23071 DJ |
548 | options = PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK | PTRACE_O_TRACEEXEC |
549 | | PTRACE_O_TRACECLONE; | |
b957e937 | 550 | if (linux_supports_tracevforkdone (pid)) |
9016a515 DJ |
551 | options |= PTRACE_O_TRACEVFORKDONE; |
552 | ||
553 | /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support | |
554 | read-only process state. */ | |
4de4c07c DJ |
555 | |
556 | ptrace (PTRACE_SETOPTIONS, pid, 0, options); | |
557 | } | |
558 | ||
6d8fd2b7 UW |
559 | static void |
560 | linux_child_post_attach (int pid) | |
4de4c07c DJ |
561 | { |
562 | linux_enable_event_reporting (pid_to_ptid (pid)); | |
0ec9a092 | 563 | check_for_thread_db (); |
4de4c07c DJ |
564 | } |
565 | ||
10d6c8cd | 566 | static void |
4de4c07c DJ |
567 | linux_child_post_startup_inferior (ptid_t ptid) |
568 | { | |
569 | linux_enable_event_reporting (ptid); | |
0ec9a092 | 570 | check_for_thread_db (); |
4de4c07c DJ |
571 | } |
572 | ||
6d8fd2b7 UW |
573 | static int |
574 | linux_child_follow_fork (struct target_ops *ops, int follow_child) | |
3993f6b1 | 575 | { |
7feb7d06 | 576 | sigset_t prev_mask; |
4de4c07c DJ |
577 | ptid_t last_ptid; |
578 | struct target_waitstatus last_status; | |
9016a515 | 579 | int has_vforked; |
4de4c07c DJ |
580 | int parent_pid, child_pid; |
581 | ||
7feb7d06 | 582 | block_child_signals (&prev_mask); |
b84876c2 | 583 | |
4de4c07c | 584 | get_last_target_status (&last_ptid, &last_status); |
9016a515 | 585 | has_vforked = (last_status.kind == TARGET_WAITKIND_VFORKED); |
d3587048 DJ |
586 | parent_pid = ptid_get_lwp (last_ptid); |
587 | if (parent_pid == 0) | |
588 | parent_pid = ptid_get_pid (last_ptid); | |
3a3e9ee3 | 589 | child_pid = PIDGET (last_status.value.related_pid); |
4de4c07c DJ |
590 | |
591 | if (! follow_child) | |
592 | { | |
593 | /* We're already attached to the parent, by default. */ | |
594 | ||
595 | /* Before detaching from the child, remove all breakpoints from | |
b242c3c2 PA |
596 | it. If we forked, then this has already been taken care of |
597 | by infrun.c. If we vforked however, any breakpoint inserted | |
598 | in the parent is visible in the child, even those added while | |
599 | stopped in a vfork catchpoint. This won't actually modify | |
600 | the breakpoint list, but will physically remove the | |
601 | breakpoints from the child. This will remove the breakpoints | |
602 | from the parent also, but they'll be reinserted below. */ | |
603 | if (has_vforked) | |
604 | detach_breakpoints (child_pid); | |
4de4c07c | 605 | |
ac264b3b MS |
606 | /* Detach new forked process? */ |
607 | if (detach_fork) | |
f75c00e4 | 608 | { |
e85a822c | 609 | if (info_verbose || debug_linux_nat) |
ac264b3b MS |
610 | { |
611 | target_terminal_ours (); | |
612 | fprintf_filtered (gdb_stdlog, | |
613 | "Detaching after fork from child process %d.\n", | |
614 | child_pid); | |
615 | } | |
4de4c07c | 616 | |
ac264b3b MS |
617 | ptrace (PTRACE_DETACH, child_pid, 0, 0); |
618 | } | |
619 | else | |
620 | { | |
621 | struct fork_info *fp; | |
77435e4c | 622 | struct inferior *parent_inf, *child_inf; |
7f9f62ba PA |
623 | |
624 | /* Add process to GDB's tables. */ | |
77435e4c PA |
625 | child_inf = add_inferior (child_pid); |
626 | ||
627 | parent_inf = find_inferior_pid (GET_PID (last_ptid)); | |
628 | child_inf->attach_flag = parent_inf->attach_flag; | |
7f9f62ba | 629 | |
ac264b3b MS |
630 | /* Retain child fork in ptrace (stopped) state. */ |
631 | fp = find_fork_pid (child_pid); | |
632 | if (!fp) | |
633 | fp = add_fork (child_pid); | |
634 | fork_save_infrun_state (fp, 0); | |
635 | } | |
9016a515 DJ |
636 | |
637 | if (has_vforked) | |
638 | { | |
b957e937 DJ |
639 | gdb_assert (linux_supports_tracefork_flag >= 0); |
640 | if (linux_supports_tracevforkdone (0)) | |
9016a515 DJ |
641 | { |
642 | int status; | |
643 | ||
644 | ptrace (PTRACE_CONT, parent_pid, 0, 0); | |
58aecb61 | 645 | my_waitpid (parent_pid, &status, __WALL); |
c874c7fc | 646 | if ((status >> 16) != PTRACE_EVENT_VFORK_DONE) |
8a3fe4f8 AC |
647 | warning (_("Unexpected waitpid result %06x when waiting for " |
648 | "vfork-done"), status); | |
9016a515 DJ |
649 | } |
650 | else | |
651 | { | |
652 | /* We can't insert breakpoints until the child has | |
653 | finished with the shared memory region. We need to | |
654 | wait until that happens. Ideal would be to just | |
655 | call: | |
656 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
657 | - waitpid (parent_pid, &status, __WALL); | |
658 | However, most architectures can't handle a syscall | |
659 | being traced on the way out if it wasn't traced on | |
660 | the way in. | |
661 | ||
662 | We might also think to loop, continuing the child | |
663 | until it exits or gets a SIGTRAP. One problem is | |
664 | that the child might call ptrace with PTRACE_TRACEME. | |
665 | ||
666 | There's no simple and reliable way to figure out when | |
667 | the vforked child will be done with its copy of the | |
668 | shared memory. We could step it out of the syscall, | |
669 | two instructions, let it go, and then single-step the | |
670 | parent once. When we have hardware single-step, this | |
671 | would work; with software single-step it could still | |
672 | be made to work but we'd have to be able to insert | |
673 | single-step breakpoints in the child, and we'd have | |
674 | to insert -just- the single-step breakpoint in the | |
675 | parent. Very awkward. | |
676 | ||
677 | In the end, the best we can do is to make sure it | |
678 | runs for a little while. Hopefully it will be out of | |
679 | range of any breakpoints we reinsert. Usually this | |
680 | is only the single-step breakpoint at vfork's return | |
681 | point. */ | |
682 | ||
683 | usleep (10000); | |
684 | } | |
685 | ||
686 | /* Since we vforked, breakpoints were removed in the parent | |
687 | too. Put them back. */ | |
688 | reattach_breakpoints (parent_pid); | |
689 | } | |
4de4c07c | 690 | } |
3993f6b1 | 691 | else |
4de4c07c | 692 | { |
4e1c45ea PA |
693 | struct thread_info *last_tp = find_thread_pid (last_ptid); |
694 | struct thread_info *tp; | |
4de4c07c | 695 | char child_pid_spelling[40]; |
77435e4c | 696 | struct inferior *parent_inf, *child_inf; |
4de4c07c | 697 | |
4e1c45ea PA |
698 | /* Copy user stepping state to the new inferior thread. */ |
699 | struct breakpoint *step_resume_breakpoint = last_tp->step_resume_breakpoint; | |
700 | CORE_ADDR step_range_start = last_tp->step_range_start; | |
701 | CORE_ADDR step_range_end = last_tp->step_range_end; | |
702 | struct frame_id step_frame_id = last_tp->step_frame_id; | |
703 | ||
704 | /* Otherwise, deleting the parent would get rid of this | |
705 | breakpoint. */ | |
706 | last_tp->step_resume_breakpoint = NULL; | |
707 | ||
4de4c07c DJ |
708 | /* Before detaching from the parent, remove all breakpoints from it. */ |
709 | remove_breakpoints (); | |
710 | ||
e85a822c | 711 | if (info_verbose || debug_linux_nat) |
f75c00e4 DJ |
712 | { |
713 | target_terminal_ours (); | |
ac264b3b MS |
714 | fprintf_filtered (gdb_stdlog, |
715 | "Attaching after fork to child process %d.\n", | |
716 | child_pid); | |
f75c00e4 | 717 | } |
4de4c07c | 718 | |
7a7d3353 PA |
719 | /* Add the new inferior first, so that the target_detach below |
720 | doesn't unpush the target. */ | |
721 | ||
77435e4c PA |
722 | child_inf = add_inferior (child_pid); |
723 | ||
724 | parent_inf = find_inferior_pid (GET_PID (last_ptid)); | |
725 | child_inf->attach_flag = parent_inf->attach_flag; | |
7a7d3353 | 726 | |
9016a515 DJ |
727 | /* If we're vforking, we may want to hold on to the parent until |
728 | the child exits or execs. At exec time we can remove the old | |
729 | breakpoints from the parent and detach it; at exit time we | |
730 | could do the same (or even, sneakily, resume debugging it - the | |
731 | child's exec has failed, or something similar). | |
732 | ||
733 | This doesn't clean up "properly", because we can't call | |
734 | target_detach, but that's OK; if the current target is "child", | |
735 | then it doesn't need any further cleanups, and lin_lwp will | |
736 | generally not encounter vfork (vfork is defined to fork | |
737 | in libpthread.so). | |
738 | ||
739 | The holding part is very easy if we have VFORKDONE events; | |
740 | but keeping track of both processes is beyond GDB at the | |
741 | moment. So we don't expose the parent to the rest of GDB. | |
742 | Instead we quietly hold onto it until such time as we can | |
743 | safely resume it. */ | |
744 | ||
745 | if (has_vforked) | |
7f9f62ba PA |
746 | { |
747 | linux_parent_pid = parent_pid; | |
748 | detach_inferior (parent_pid); | |
749 | } | |
ac264b3b MS |
750 | else if (!detach_fork) |
751 | { | |
752 | struct fork_info *fp; | |
753 | /* Retain parent fork in ptrace (stopped) state. */ | |
754 | fp = find_fork_pid (parent_pid); | |
755 | if (!fp) | |
756 | fp = add_fork (parent_pid); | |
757 | fork_save_infrun_state (fp, 0); | |
0d14fc63 PA |
758 | |
759 | /* Also add an entry for the child fork. */ | |
760 | fp = find_fork_pid (child_pid); | |
761 | if (!fp) | |
762 | fp = add_fork (child_pid); | |
763 | fork_save_infrun_state (fp, 0); | |
ac264b3b | 764 | } |
9016a515 | 765 | else |
b84876c2 | 766 | target_detach (NULL, 0); |
4de4c07c | 767 | |
9f0bdab8 | 768 | inferior_ptid = ptid_build (child_pid, child_pid, 0); |
ac264b3b | 769 | |
9f0bdab8 | 770 | linux_nat_switch_fork (inferior_ptid); |
ef29ce1a | 771 | check_for_thread_db (); |
4de4c07c | 772 | |
4e1c45ea PA |
773 | tp = inferior_thread (); |
774 | tp->step_resume_breakpoint = step_resume_breakpoint; | |
775 | tp->step_range_start = step_range_start; | |
776 | tp->step_range_end = step_range_end; | |
777 | tp->step_frame_id = step_frame_id; | |
778 | ||
4de4c07c DJ |
779 | /* Reset breakpoints in the child as appropriate. */ |
780 | follow_inferior_reset_breakpoints (); | |
781 | } | |
782 | ||
7feb7d06 | 783 | restore_child_signals_mask (&prev_mask); |
4de4c07c DJ |
784 | return 0; |
785 | } | |
786 | ||
4de4c07c | 787 | \f |
6d8fd2b7 UW |
788 | static void |
789 | linux_child_insert_fork_catchpoint (int pid) | |
4de4c07c | 790 | { |
b957e937 | 791 | if (! linux_supports_tracefork (pid)) |
8a3fe4f8 | 792 | error (_("Your system does not support fork catchpoints.")); |
3993f6b1 DJ |
793 | } |
794 | ||
6d8fd2b7 UW |
795 | static void |
796 | linux_child_insert_vfork_catchpoint (int pid) | |
3993f6b1 | 797 | { |
b957e937 | 798 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 799 | error (_("Your system does not support vfork catchpoints.")); |
3993f6b1 DJ |
800 | } |
801 | ||
6d8fd2b7 UW |
802 | static void |
803 | linux_child_insert_exec_catchpoint (int pid) | |
3993f6b1 | 804 | { |
b957e937 | 805 | if (!linux_supports_tracefork (pid)) |
8a3fe4f8 | 806 | error (_("Your system does not support exec catchpoints.")); |
3993f6b1 DJ |
807 | } |
808 | ||
d6b0e80f AC |
809 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's |
810 | are processes sharing the same VM space. A multi-threaded process | |
811 | is basically a group of such processes. However, such a grouping | |
812 | is almost entirely a user-space issue; the kernel doesn't enforce | |
813 | such a grouping at all (this might change in the future). In | |
814 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
815 | Threads library) to provide such a grouping. | |
816 | ||
817 | It is perfectly well possible to write a multi-threaded application | |
818 | without the assistance of a threads library, by using the clone | |
819 | system call directly. This module should be able to give some | |
820 | rudimentary support for debugging such applications if developers | |
821 | specify the CLONE_PTRACE flag in the clone system call, and are | |
822 | using the Linux kernel 2.4 or above. | |
823 | ||
824 | Note that there are some peculiarities in GNU/Linux that affect | |
825 | this code: | |
826 | ||
827 | - In general one should specify the __WCLONE flag to waitpid in | |
828 | order to make it report events for any of the cloned processes | |
829 | (and leave it out for the initial process). However, if a cloned | |
830 | process has exited the exit status is only reported if the | |
831 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but | |
832 | we cannot use it since GDB must work on older systems too. | |
833 | ||
834 | - When a traced, cloned process exits and is waited for by the | |
835 | debugger, the kernel reassigns it to the original parent and | |
836 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads | |
837 | library doesn't notice this, which leads to the "zombie problem": | |
838 | When debugged a multi-threaded process that spawns a lot of | |
839 | threads will run out of processes, even if the threads exit, | |
840 | because the "zombies" stay around. */ | |
841 | ||
842 | /* List of known LWPs. */ | |
9f0bdab8 | 843 | struct lwp_info *lwp_list; |
d6b0e80f AC |
844 | |
845 | /* Number of LWPs in the list. */ | |
846 | static int num_lwps; | |
d6b0e80f AC |
847 | \f |
848 | ||
d6b0e80f AC |
849 | /* Original signal mask. */ |
850 | static sigset_t normal_mask; | |
851 | ||
852 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
853 | _initialize_linux_nat. */ | |
854 | static sigset_t suspend_mask; | |
855 | ||
7feb7d06 PA |
856 | /* Signals to block to make that sigsuspend work. */ |
857 | static sigset_t blocked_mask; | |
858 | ||
859 | /* SIGCHLD action. */ | |
860 | struct sigaction sigchld_action; | |
b84876c2 | 861 | |
7feb7d06 PA |
862 | /* Block child signals (SIGCHLD and linux threads signals), and store |
863 | the previous mask in PREV_MASK. */ | |
84e46146 | 864 | |
7feb7d06 PA |
865 | static void |
866 | block_child_signals (sigset_t *prev_mask) | |
867 | { | |
868 | /* Make sure SIGCHLD is blocked. */ | |
869 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
870 | sigaddset (&blocked_mask, SIGCHLD); | |
871 | ||
872 | sigprocmask (SIG_BLOCK, &blocked_mask, prev_mask); | |
873 | } | |
874 | ||
875 | /* Restore child signals mask, previously returned by | |
876 | block_child_signals. */ | |
877 | ||
878 | static void | |
879 | restore_child_signals_mask (sigset_t *prev_mask) | |
880 | { | |
881 | sigprocmask (SIG_SETMASK, prev_mask, NULL); | |
882 | } | |
d6b0e80f AC |
883 | \f |
884 | ||
885 | /* Prototypes for local functions. */ | |
886 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
28439f5e | 887 | static int linux_thread_alive (ptid_t ptid); |
6d8fd2b7 | 888 | static char *linux_child_pid_to_exec_file (int pid); |
710151dd PA |
889 | static int cancel_breakpoint (struct lwp_info *lp); |
890 | ||
d6b0e80f AC |
891 | \f |
892 | /* Convert wait status STATUS to a string. Used for printing debug | |
893 | messages only. */ | |
894 | ||
895 | static char * | |
896 | status_to_str (int status) | |
897 | { | |
898 | static char buf[64]; | |
899 | ||
900 | if (WIFSTOPPED (status)) | |
901 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
902 | strsignal (WSTOPSIG (status))); | |
903 | else if (WIFSIGNALED (status)) | |
904 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
905 | strsignal (WSTOPSIG (status))); | |
906 | else | |
907 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
908 | ||
909 | return buf; | |
910 | } | |
911 | ||
912 | /* Initialize the list of LWPs. Note that this module, contrary to | |
913 | what GDB's generic threads layer does for its thread list, | |
914 | re-initializes the LWP lists whenever we mourn or detach (which | |
915 | doesn't involve mourning) the inferior. */ | |
916 | ||
917 | static void | |
918 | init_lwp_list (void) | |
919 | { | |
920 | struct lwp_info *lp, *lpnext; | |
921 | ||
922 | for (lp = lwp_list; lp; lp = lpnext) | |
923 | { | |
924 | lpnext = lp->next; | |
925 | xfree (lp); | |
926 | } | |
927 | ||
928 | lwp_list = NULL; | |
929 | num_lwps = 0; | |
d6b0e80f AC |
930 | } |
931 | ||
f973ed9c | 932 | /* Add the LWP specified by PID to the list. Return a pointer to the |
9f0bdab8 DJ |
933 | structure describing the new LWP. The LWP should already be stopped |
934 | (with an exception for the very first LWP). */ | |
d6b0e80f AC |
935 | |
936 | static struct lwp_info * | |
937 | add_lwp (ptid_t ptid) | |
938 | { | |
939 | struct lwp_info *lp; | |
940 | ||
941 | gdb_assert (is_lwp (ptid)); | |
942 | ||
943 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
944 | ||
945 | memset (lp, 0, sizeof (struct lwp_info)); | |
946 | ||
947 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
948 | ||
949 | lp->ptid = ptid; | |
950 | ||
951 | lp->next = lwp_list; | |
952 | lwp_list = lp; | |
f973ed9c | 953 | ++num_lwps; |
d6b0e80f | 954 | |
9f0bdab8 DJ |
955 | if (num_lwps > 1 && linux_nat_new_thread != NULL) |
956 | linux_nat_new_thread (ptid); | |
957 | ||
d6b0e80f AC |
958 | return lp; |
959 | } | |
960 | ||
961 | /* Remove the LWP specified by PID from the list. */ | |
962 | ||
963 | static void | |
964 | delete_lwp (ptid_t ptid) | |
965 | { | |
966 | struct lwp_info *lp, *lpprev; | |
967 | ||
968 | lpprev = NULL; | |
969 | ||
970 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
971 | if (ptid_equal (lp->ptid, ptid)) | |
972 | break; | |
973 | ||
974 | if (!lp) | |
975 | return; | |
976 | ||
d6b0e80f AC |
977 | num_lwps--; |
978 | ||
979 | if (lpprev) | |
980 | lpprev->next = lp->next; | |
981 | else | |
982 | lwp_list = lp->next; | |
983 | ||
984 | xfree (lp); | |
985 | } | |
986 | ||
987 | /* Return a pointer to the structure describing the LWP corresponding | |
988 | to PID. If no corresponding LWP could be found, return NULL. */ | |
989 | ||
990 | static struct lwp_info * | |
991 | find_lwp_pid (ptid_t ptid) | |
992 | { | |
993 | struct lwp_info *lp; | |
994 | int lwp; | |
995 | ||
996 | if (is_lwp (ptid)) | |
997 | lwp = GET_LWP (ptid); | |
998 | else | |
999 | lwp = GET_PID (ptid); | |
1000 | ||
1001 | for (lp = lwp_list; lp; lp = lp->next) | |
1002 | if (lwp == GET_LWP (lp->ptid)) | |
1003 | return lp; | |
1004 | ||
1005 | return NULL; | |
1006 | } | |
1007 | ||
1008 | /* Call CALLBACK with its second argument set to DATA for every LWP in | |
1009 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
1010 | pointer to the structure describing that LWP immediately. | |
1011 | Otherwise return NULL. */ | |
1012 | ||
1013 | struct lwp_info * | |
1014 | iterate_over_lwps (int (*callback) (struct lwp_info *, void *), void *data) | |
1015 | { | |
1016 | struct lwp_info *lp, *lpnext; | |
1017 | ||
1018 | for (lp = lwp_list; lp; lp = lpnext) | |
1019 | { | |
1020 | lpnext = lp->next; | |
1021 | if ((*callback) (lp, data)) | |
1022 | return lp; | |
1023 | } | |
1024 | ||
1025 | return NULL; | |
1026 | } | |
1027 | ||
f973ed9c DJ |
1028 | /* Update our internal state when changing from one fork (checkpoint, |
1029 | et cetera) to another indicated by NEW_PTID. We can only switch | |
1030 | single-threaded applications, so we only create one new LWP, and | |
1031 | the previous list is discarded. */ | |
1032 | ||
1033 | void | |
1034 | linux_nat_switch_fork (ptid_t new_ptid) | |
1035 | { | |
1036 | struct lwp_info *lp; | |
1037 | ||
1038 | init_lwp_list (); | |
1039 | lp = add_lwp (new_ptid); | |
1040 | lp->stopped = 1; | |
e26af52f | 1041 | |
4f8d22e3 PA |
1042 | init_thread_list (); |
1043 | add_thread_silent (new_ptid); | |
e26af52f DJ |
1044 | } |
1045 | ||
e26af52f DJ |
1046 | /* Handle the exit of a single thread LP. */ |
1047 | ||
1048 | static void | |
1049 | exit_lwp (struct lwp_info *lp) | |
1050 | { | |
063bfe2e VP |
1051 | struct thread_info *th = find_thread_pid (lp->ptid); |
1052 | ||
1053 | if (th) | |
e26af52f | 1054 | { |
17faa917 DJ |
1055 | if (print_thread_events) |
1056 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1057 | ||
4f8d22e3 | 1058 | delete_thread (lp->ptid); |
e26af52f DJ |
1059 | } |
1060 | ||
1061 | delete_lwp (lp->ptid); | |
1062 | } | |
1063 | ||
a0ef4274 DJ |
1064 | /* Detect `T (stopped)' in `/proc/PID/status'. |
1065 | Other states including `T (tracing stop)' are reported as false. */ | |
1066 | ||
1067 | static int | |
1068 | pid_is_stopped (pid_t pid) | |
1069 | { | |
1070 | FILE *status_file; | |
1071 | char buf[100]; | |
1072 | int retval = 0; | |
1073 | ||
1074 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
1075 | status_file = fopen (buf, "r"); | |
1076 | if (status_file != NULL) | |
1077 | { | |
1078 | int have_state = 0; | |
1079 | ||
1080 | while (fgets (buf, sizeof (buf), status_file)) | |
1081 | { | |
1082 | if (strncmp (buf, "State:", 6) == 0) | |
1083 | { | |
1084 | have_state = 1; | |
1085 | break; | |
1086 | } | |
1087 | } | |
1088 | if (have_state && strstr (buf, "T (stopped)") != NULL) | |
1089 | retval = 1; | |
1090 | fclose (status_file); | |
1091 | } | |
1092 | return retval; | |
1093 | } | |
1094 | ||
1095 | /* Wait for the LWP specified by LP, which we have just attached to. | |
1096 | Returns a wait status for that LWP, to cache. */ | |
1097 | ||
1098 | static int | |
1099 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *cloned, | |
1100 | int *signalled) | |
1101 | { | |
1102 | pid_t new_pid, pid = GET_LWP (ptid); | |
1103 | int status; | |
1104 | ||
1105 | if (pid_is_stopped (pid)) | |
1106 | { | |
1107 | if (debug_linux_nat) | |
1108 | fprintf_unfiltered (gdb_stdlog, | |
1109 | "LNPAW: Attaching to a stopped process\n"); | |
1110 | ||
1111 | /* The process is definitely stopped. It is in a job control | |
1112 | stop, unless the kernel predates the TASK_STOPPED / | |
1113 | TASK_TRACED distinction, in which case it might be in a | |
1114 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1115 | can kill it, signal it, et cetera. | |
1116 | ||
1117 | First make sure there is a pending SIGSTOP. Since we are | |
1118 | already attached, the process can not transition from stopped | |
1119 | to running without a PTRACE_CONT; so we know this signal will | |
1120 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1121 | probably already in the queue (unless this kernel is old | |
1122 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1123 | is not an RT signal, it can only be queued once. */ | |
1124 | kill_lwp (pid, SIGSTOP); | |
1125 | ||
1126 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1127 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1128 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1129 | } | |
1130 | ||
1131 | /* Make sure the initial process is stopped. The user-level threads | |
1132 | layer might want to poke around in the inferior, and that won't | |
1133 | work if things haven't stabilized yet. */ | |
1134 | new_pid = my_waitpid (pid, &status, 0); | |
1135 | if (new_pid == -1 && errno == ECHILD) | |
1136 | { | |
1137 | if (first) | |
1138 | warning (_("%s is a cloned process"), target_pid_to_str (ptid)); | |
1139 | ||
1140 | /* Try again with __WCLONE to check cloned processes. */ | |
1141 | new_pid = my_waitpid (pid, &status, __WCLONE); | |
1142 | *cloned = 1; | |
1143 | } | |
1144 | ||
1145 | gdb_assert (pid == new_pid && WIFSTOPPED (status)); | |
1146 | ||
1147 | if (WSTOPSIG (status) != SIGSTOP) | |
1148 | { | |
1149 | *signalled = 1; | |
1150 | if (debug_linux_nat) | |
1151 | fprintf_unfiltered (gdb_stdlog, | |
1152 | "LNPAW: Received %s after attaching\n", | |
1153 | status_to_str (status)); | |
1154 | } | |
1155 | ||
1156 | return status; | |
1157 | } | |
1158 | ||
1159 | /* Attach to the LWP specified by PID. Return 0 if successful or -1 | |
1160 | if the new LWP could not be attached. */ | |
d6b0e80f | 1161 | |
9ee57c33 | 1162 | int |
93815fbf | 1163 | lin_lwp_attach_lwp (ptid_t ptid) |
d6b0e80f | 1164 | { |
9ee57c33 | 1165 | struct lwp_info *lp; |
7feb7d06 | 1166 | sigset_t prev_mask; |
d6b0e80f AC |
1167 | |
1168 | gdb_assert (is_lwp (ptid)); | |
1169 | ||
7feb7d06 | 1170 | block_child_signals (&prev_mask); |
d6b0e80f | 1171 | |
9ee57c33 | 1172 | lp = find_lwp_pid (ptid); |
d6b0e80f AC |
1173 | |
1174 | /* We assume that we're already attached to any LWP that has an id | |
1175 | equal to the overall process id, and to any LWP that is already | |
1176 | in our list of LWPs. If we're not seeing exit events from threads | |
1177 | and we've had PID wraparound since we last tried to stop all threads, | |
1178 | this assumption might be wrong; fortunately, this is very unlikely | |
1179 | to happen. */ | |
9ee57c33 | 1180 | if (GET_LWP (ptid) != GET_PID (ptid) && lp == NULL) |
d6b0e80f | 1181 | { |
a0ef4274 | 1182 | int status, cloned = 0, signalled = 0; |
d6b0e80f AC |
1183 | |
1184 | if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0) | |
9ee57c33 DJ |
1185 | { |
1186 | /* If we fail to attach to the thread, issue a warning, | |
1187 | but continue. One way this can happen is if thread | |
e9efe249 | 1188 | creation is interrupted; as of Linux kernel 2.6.19, a |
9ee57c33 DJ |
1189 | bug may place threads in the thread list and then fail |
1190 | to create them. */ | |
1191 | warning (_("Can't attach %s: %s"), target_pid_to_str (ptid), | |
1192 | safe_strerror (errno)); | |
7feb7d06 | 1193 | restore_child_signals_mask (&prev_mask); |
9ee57c33 DJ |
1194 | return -1; |
1195 | } | |
1196 | ||
d6b0e80f AC |
1197 | if (debug_linux_nat) |
1198 | fprintf_unfiltered (gdb_stdlog, | |
1199 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1200 | target_pid_to_str (ptid)); | |
1201 | ||
a0ef4274 DJ |
1202 | status = linux_nat_post_attach_wait (ptid, 0, &cloned, &signalled); |
1203 | lp = add_lwp (ptid); | |
1204 | lp->stopped = 1; | |
1205 | lp->cloned = cloned; | |
1206 | lp->signalled = signalled; | |
1207 | if (WSTOPSIG (status) != SIGSTOP) | |
d6b0e80f | 1208 | { |
a0ef4274 DJ |
1209 | lp->resumed = 1; |
1210 | lp->status = status; | |
d6b0e80f AC |
1211 | } |
1212 | ||
a0ef4274 | 1213 | target_post_attach (GET_LWP (lp->ptid)); |
d6b0e80f AC |
1214 | |
1215 | if (debug_linux_nat) | |
1216 | { | |
1217 | fprintf_unfiltered (gdb_stdlog, | |
1218 | "LLAL: waitpid %s received %s\n", | |
1219 | target_pid_to_str (ptid), | |
1220 | status_to_str (status)); | |
1221 | } | |
1222 | } | |
1223 | else | |
1224 | { | |
1225 | /* We assume that the LWP representing the original process is | |
1226 | already stopped. Mark it as stopped in the data structure | |
155bd5d1 AC |
1227 | that the GNU/linux ptrace layer uses to keep track of |
1228 | threads. Note that this won't have already been done since | |
1229 | the main thread will have, we assume, been stopped by an | |
1230 | attach from a different layer. */ | |
9ee57c33 DJ |
1231 | if (lp == NULL) |
1232 | lp = add_lwp (ptid); | |
d6b0e80f AC |
1233 | lp->stopped = 1; |
1234 | } | |
9ee57c33 | 1235 | |
7feb7d06 | 1236 | restore_child_signals_mask (&prev_mask); |
9ee57c33 | 1237 | return 0; |
d6b0e80f AC |
1238 | } |
1239 | ||
b84876c2 | 1240 | static void |
136d6dae VP |
1241 | linux_nat_create_inferior (struct target_ops *ops, |
1242 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1243 | int from_tty) |
1244 | { | |
1245 | int saved_async = 0; | |
10568435 JK |
1246 | #ifdef HAVE_PERSONALITY |
1247 | int personality_orig = 0, personality_set = 0; | |
1248 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1249 | |
1250 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1251 | we have to mask the async mode. */ | |
1252 | ||
1253 | if (target_can_async_p ()) | |
84e46146 PA |
1254 | /* Mask async mode. Creating a child requires a loop calling |
1255 | wait_for_inferior currently. */ | |
b84876c2 | 1256 | saved_async = linux_nat_async_mask (0); |
84e46146 | 1257 | |
10568435 JK |
1258 | #ifdef HAVE_PERSONALITY |
1259 | if (disable_randomization) | |
1260 | { | |
1261 | errno = 0; | |
1262 | personality_orig = personality (0xffffffff); | |
1263 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
1264 | { | |
1265 | personality_set = 1; | |
1266 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
1267 | } | |
1268 | if (errno != 0 || (personality_set | |
1269 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
1270 | warning (_("Error disabling address space randomization: %s"), | |
1271 | safe_strerror (errno)); | |
1272 | } | |
1273 | #endif /* HAVE_PERSONALITY */ | |
1274 | ||
136d6dae | 1275 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1276 | |
10568435 JK |
1277 | #ifdef HAVE_PERSONALITY |
1278 | if (personality_set) | |
1279 | { | |
1280 | errno = 0; | |
1281 | personality (personality_orig); | |
1282 | if (errno != 0) | |
1283 | warning (_("Error restoring address space randomization: %s"), | |
1284 | safe_strerror (errno)); | |
1285 | } | |
1286 | #endif /* HAVE_PERSONALITY */ | |
1287 | ||
b84876c2 PA |
1288 | if (saved_async) |
1289 | linux_nat_async_mask (saved_async); | |
1290 | } | |
1291 | ||
d6b0e80f | 1292 | static void |
136d6dae | 1293 | linux_nat_attach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f AC |
1294 | { |
1295 | struct lwp_info *lp; | |
d6b0e80f | 1296 | int status; |
af990527 | 1297 | ptid_t ptid; |
d6b0e80f AC |
1298 | |
1299 | /* FIXME: We should probably accept a list of process id's, and | |
1300 | attach all of them. */ | |
136d6dae | 1301 | linux_ops->to_attach (ops, args, from_tty); |
d6b0e80f | 1302 | |
af990527 PA |
1303 | /* The ptrace base target adds the main thread with (pid,0,0) |
1304 | format. Decorate it with lwp info. */ | |
1305 | ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)); | |
1306 | thread_change_ptid (inferior_ptid, ptid); | |
1307 | ||
9f0bdab8 | 1308 | /* Add the initial process as the first LWP to the list. */ |
af990527 | 1309 | lp = add_lwp (ptid); |
a0ef4274 DJ |
1310 | |
1311 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned, | |
1312 | &lp->signalled); | |
1313 | lp->stopped = 1; | |
9f0bdab8 | 1314 | |
a0ef4274 | 1315 | /* Save the wait status to report later. */ |
d6b0e80f | 1316 | lp->resumed = 1; |
a0ef4274 DJ |
1317 | if (debug_linux_nat) |
1318 | fprintf_unfiltered (gdb_stdlog, | |
1319 | "LNA: waitpid %ld, saving status %s\n", | |
1320 | (long) GET_PID (lp->ptid), status_to_str (status)); | |
710151dd | 1321 | |
7feb7d06 PA |
1322 | lp->status = status; |
1323 | ||
1324 | if (target_can_async_p ()) | |
1325 | target_async (inferior_event_handler, 0); | |
d6b0e80f AC |
1326 | } |
1327 | ||
a0ef4274 DJ |
1328 | /* Get pending status of LP. */ |
1329 | static int | |
1330 | get_pending_status (struct lwp_info *lp, int *status) | |
1331 | { | |
1332 | struct target_waitstatus last; | |
1333 | ptid_t last_ptid; | |
1334 | ||
1335 | get_last_target_status (&last_ptid, &last); | |
1336 | ||
1337 | /* If this lwp is the ptid that GDB is processing an event from, the | |
7feb7d06 PA |
1338 | signal will be in stop_signal. Otherwise, we may cache pending |
1339 | events in lp->status while trying to stop all threads (see | |
1340 | stop_wait_callback). */ | |
a0ef4274 DJ |
1341 | |
1342 | *status = 0; | |
4c28f408 PA |
1343 | |
1344 | if (non_stop) | |
a0ef4274 | 1345 | { |
4c28f408 PA |
1346 | enum target_signal signo = TARGET_SIGNAL_0; |
1347 | ||
1348 | if (is_executing (lp->ptid)) | |
1349 | { | |
1350 | /* If the core thought this lwp was executing --- e.g., the | |
1351 | executing property hasn't been updated yet, but the | |
1352 | thread has been stopped with a stop_callback / | |
1353 | stop_wait_callback sequence (see linux_nat_detach for | |
1354 | example) --- we can only have pending events in the local | |
1355 | queue. */ | |
7feb7d06 | 1356 | signo = target_signal_from_host (WSTOPSIG (lp->status)); |
4c28f408 PA |
1357 | } |
1358 | else | |
1359 | { | |
1360 | /* If the core knows the thread is not executing, then we | |
1361 | have the last signal recorded in | |
2020b7ab | 1362 | thread_info->stop_signal. */ |
4c28f408 | 1363 | |
2020b7ab PA |
1364 | struct thread_info *tp = find_thread_pid (lp->ptid); |
1365 | signo = tp->stop_signal; | |
4c28f408 PA |
1366 | } |
1367 | ||
1368 | if (signo != TARGET_SIGNAL_0 | |
1369 | && !signal_pass_state (signo)) | |
1370 | { | |
1371 | if (debug_linux_nat) | |
1372 | fprintf_unfiltered (gdb_stdlog, "\ | |
1373 | GPT: lwp %s had signal %s, but it is in no pass state\n", | |
1374 | target_pid_to_str (lp->ptid), | |
1375 | target_signal_to_string (signo)); | |
1376 | } | |
1377 | else | |
1378 | { | |
1379 | if (signo != TARGET_SIGNAL_0) | |
1380 | *status = W_STOPCODE (target_signal_to_host (signo)); | |
1381 | ||
1382 | if (debug_linux_nat) | |
1383 | fprintf_unfiltered (gdb_stdlog, | |
1384 | "GPT: lwp %s as pending signal %s\n", | |
1385 | target_pid_to_str (lp->ptid), | |
1386 | target_signal_to_string (signo)); | |
1387 | } | |
a0ef4274 | 1388 | } |
a0ef4274 | 1389 | else |
4c28f408 PA |
1390 | { |
1391 | if (GET_LWP (lp->ptid) == GET_LWP (last_ptid)) | |
1392 | { | |
2020b7ab PA |
1393 | struct thread_info *tp = find_thread_pid (lp->ptid); |
1394 | if (tp->stop_signal != TARGET_SIGNAL_0 | |
1395 | && signal_pass_state (tp->stop_signal)) | |
1396 | *status = W_STOPCODE (target_signal_to_host (tp->stop_signal)); | |
4c28f408 | 1397 | } |
4c28f408 PA |
1398 | else |
1399 | *status = lp->status; | |
1400 | } | |
a0ef4274 DJ |
1401 | |
1402 | return 0; | |
1403 | } | |
1404 | ||
d6b0e80f AC |
1405 | static int |
1406 | detach_callback (struct lwp_info *lp, void *data) | |
1407 | { | |
1408 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1409 | ||
1410 | if (debug_linux_nat && lp->status) | |
1411 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1412 | strsignal (WSTOPSIG (lp->status)), | |
1413 | target_pid_to_str (lp->ptid)); | |
1414 | ||
a0ef4274 DJ |
1415 | /* If there is a pending SIGSTOP, get rid of it. */ |
1416 | if (lp->signalled) | |
d6b0e80f | 1417 | { |
d6b0e80f AC |
1418 | if (debug_linux_nat) |
1419 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1420 | "DC: Sending SIGCONT to %s\n", |
1421 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1422 | |
a0ef4274 | 1423 | kill_lwp (GET_LWP (lp->ptid), SIGCONT); |
d6b0e80f | 1424 | lp->signalled = 0; |
d6b0e80f AC |
1425 | } |
1426 | ||
1427 | /* We don't actually detach from the LWP that has an id equal to the | |
1428 | overall process id just yet. */ | |
1429 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1430 | { | |
a0ef4274 DJ |
1431 | int status = 0; |
1432 | ||
1433 | /* Pass on any pending signal for this LWP. */ | |
1434 | get_pending_status (lp, &status); | |
1435 | ||
d6b0e80f AC |
1436 | errno = 0; |
1437 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
a0ef4274 | 1438 | WSTOPSIG (status)) < 0) |
8a3fe4f8 | 1439 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1440 | safe_strerror (errno)); |
1441 | ||
1442 | if (debug_linux_nat) | |
1443 | fprintf_unfiltered (gdb_stdlog, | |
1444 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1445 | target_pid_to_str (lp->ptid), | |
7feb7d06 | 1446 | strsignal (WSTOPSIG (status))); |
d6b0e80f AC |
1447 | |
1448 | delete_lwp (lp->ptid); | |
1449 | } | |
1450 | ||
1451 | return 0; | |
1452 | } | |
1453 | ||
1454 | static void | |
136d6dae | 1455 | linux_nat_detach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f | 1456 | { |
b84876c2 | 1457 | int pid; |
a0ef4274 DJ |
1458 | int status; |
1459 | enum target_signal sig; | |
1460 | ||
b84876c2 PA |
1461 | if (target_can_async_p ()) |
1462 | linux_nat_async (NULL, 0); | |
1463 | ||
4c28f408 PA |
1464 | /* Stop all threads before detaching. ptrace requires that the |
1465 | thread is stopped to sucessfully detach. */ | |
1466 | iterate_over_lwps (stop_callback, NULL); | |
1467 | /* ... and wait until all of them have reported back that | |
1468 | they're no longer running. */ | |
1469 | iterate_over_lwps (stop_wait_callback, NULL); | |
1470 | ||
d6b0e80f AC |
1471 | iterate_over_lwps (detach_callback, NULL); |
1472 | ||
1473 | /* Only the initial process should be left right now. */ | |
1474 | gdb_assert (num_lwps == 1); | |
1475 | ||
a0ef4274 DJ |
1476 | /* Pass on any pending signal for the last LWP. */ |
1477 | if ((args == NULL || *args == '\0') | |
1478 | && get_pending_status (lwp_list, &status) != -1 | |
1479 | && WIFSTOPPED (status)) | |
1480 | { | |
1481 | /* Put the signal number in ARGS so that inf_ptrace_detach will | |
1482 | pass it along with PTRACE_DETACH. */ | |
1483 | args = alloca (8); | |
1484 | sprintf (args, "%d", (int) WSTOPSIG (status)); | |
1485 | fprintf_unfiltered (gdb_stdlog, | |
1486 | "LND: Sending signal %s to %s\n", | |
1487 | args, | |
1488 | target_pid_to_str (lwp_list->ptid)); | |
1489 | } | |
1490 | ||
d6b0e80f AC |
1491 | /* Destroy LWP info; it's no longer valid. */ |
1492 | init_lwp_list (); | |
1493 | ||
7a7d3353 | 1494 | pid = ptid_get_pid (inferior_ptid); |
b84876c2 | 1495 | |
7a7d3353 PA |
1496 | if (forks_exist_p ()) |
1497 | { | |
1498 | /* Multi-fork case. The current inferior_ptid is being detached | |
1499 | from, but there are other viable forks to debug. Detach from | |
1500 | the current fork, and context-switch to the first | |
1501 | available. */ | |
1502 | linux_fork_detach (args, from_tty); | |
1503 | ||
1504 | if (non_stop && target_can_async_p ()) | |
1505 | target_async (inferior_event_handler, 0); | |
1506 | } | |
1507 | else | |
1508 | linux_ops->to_detach (ops, args, from_tty); | |
d6b0e80f AC |
1509 | } |
1510 | ||
1511 | /* Resume LP. */ | |
1512 | ||
1513 | static int | |
1514 | resume_callback (struct lwp_info *lp, void *data) | |
1515 | { | |
1516 | if (lp->stopped && lp->status == 0) | |
1517 | { | |
28439f5e PA |
1518 | linux_ops->to_resume (linux_ops, |
1519 | pid_to_ptid (GET_LWP (lp->ptid)), | |
10d6c8cd | 1520 | 0, TARGET_SIGNAL_0); |
d6b0e80f AC |
1521 | if (debug_linux_nat) |
1522 | fprintf_unfiltered (gdb_stdlog, | |
1523 | "RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n", | |
1524 | target_pid_to_str (lp->ptid)); | |
1525 | lp->stopped = 0; | |
1526 | lp->step = 0; | |
9f0bdab8 | 1527 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
d6b0e80f | 1528 | } |
57380f4e DJ |
1529 | else if (lp->stopped && debug_linux_nat) |
1530 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (has pending)\n", | |
1531 | target_pid_to_str (lp->ptid)); | |
1532 | else if (debug_linux_nat) | |
1533 | fprintf_unfiltered (gdb_stdlog, "RC: Not resuming sibling %s (not stopped)\n", | |
1534 | target_pid_to_str (lp->ptid)); | |
d6b0e80f AC |
1535 | |
1536 | return 0; | |
1537 | } | |
1538 | ||
1539 | static int | |
1540 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1541 | { | |
1542 | lp->resumed = 0; | |
1543 | return 0; | |
1544 | } | |
1545 | ||
1546 | static int | |
1547 | resume_set_callback (struct lwp_info *lp, void *data) | |
1548 | { | |
1549 | lp->resumed = 1; | |
1550 | return 0; | |
1551 | } | |
1552 | ||
1553 | static void | |
28439f5e PA |
1554 | linux_nat_resume (struct target_ops *ops, |
1555 | ptid_t ptid, int step, enum target_signal signo) | |
d6b0e80f | 1556 | { |
7feb7d06 | 1557 | sigset_t prev_mask; |
d6b0e80f AC |
1558 | struct lwp_info *lp; |
1559 | int resume_all; | |
1560 | ||
76f50ad1 DJ |
1561 | if (debug_linux_nat) |
1562 | fprintf_unfiltered (gdb_stdlog, | |
1563 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1564 | step ? "step" : "resume", | |
1565 | target_pid_to_str (ptid), | |
1566 | signo ? strsignal (signo) : "0", | |
1567 | target_pid_to_str (inferior_ptid)); | |
1568 | ||
7feb7d06 | 1569 | block_child_signals (&prev_mask); |
b84876c2 | 1570 | |
d6b0e80f AC |
1571 | /* A specific PTID means `step only this process id'. */ |
1572 | resume_all = (PIDGET (ptid) == -1); | |
1573 | ||
4c28f408 PA |
1574 | if (non_stop && resume_all) |
1575 | internal_error (__FILE__, __LINE__, | |
1576 | "can't resume all in non-stop mode"); | |
1577 | ||
1578 | if (!non_stop) | |
1579 | { | |
1580 | if (resume_all) | |
1581 | iterate_over_lwps (resume_set_callback, NULL); | |
1582 | else | |
1583 | iterate_over_lwps (resume_clear_callback, NULL); | |
1584 | } | |
d6b0e80f AC |
1585 | |
1586 | /* If PID is -1, it's the current inferior that should be | |
1587 | handled specially. */ | |
1588 | if (PIDGET (ptid) == -1) | |
1589 | ptid = inferior_ptid; | |
1590 | ||
1591 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1592 | gdb_assert (lp != NULL); |
d6b0e80f | 1593 | |
4c28f408 | 1594 | /* Convert to something the lower layer understands. */ |
9f0bdab8 | 1595 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); |
d6b0e80f | 1596 | |
9f0bdab8 DJ |
1597 | /* Remember if we're stepping. */ |
1598 | lp->step = step; | |
d6b0e80f | 1599 | |
9f0bdab8 DJ |
1600 | /* Mark this LWP as resumed. */ |
1601 | lp->resumed = 1; | |
76f50ad1 | 1602 | |
9f0bdab8 DJ |
1603 | /* If we have a pending wait status for this thread, there is no |
1604 | point in resuming the process. But first make sure that | |
1605 | linux_nat_wait won't preemptively handle the event - we | |
1606 | should never take this short-circuit if we are going to | |
1607 | leave LP running, since we have skipped resuming all the | |
1608 | other threads. This bit of code needs to be synchronized | |
1609 | with linux_nat_wait. */ | |
76f50ad1 | 1610 | |
9f0bdab8 DJ |
1611 | if (lp->status && WIFSTOPPED (lp->status)) |
1612 | { | |
d6b48e9c PA |
1613 | int saved_signo; |
1614 | struct inferior *inf; | |
76f50ad1 | 1615 | |
d6b48e9c PA |
1616 | inf = find_inferior_pid (ptid_get_pid (ptid)); |
1617 | gdb_assert (inf); | |
1618 | saved_signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1619 | ||
1620 | /* Defer to common code if we're gaining control of the | |
1621 | inferior. */ | |
1622 | if (inf->stop_soon == NO_STOP_QUIETLY | |
1623 | && signal_stop_state (saved_signo) == 0 | |
9f0bdab8 DJ |
1624 | && signal_print_state (saved_signo) == 0 |
1625 | && signal_pass_state (saved_signo) == 1) | |
d6b0e80f | 1626 | { |
9f0bdab8 DJ |
1627 | if (debug_linux_nat) |
1628 | fprintf_unfiltered (gdb_stdlog, | |
1629 | "LLR: Not short circuiting for ignored " | |
1630 | "status 0x%x\n", lp->status); | |
1631 | ||
d6b0e80f AC |
1632 | /* FIXME: What should we do if we are supposed to continue |
1633 | this thread with a signal? */ | |
1634 | gdb_assert (signo == TARGET_SIGNAL_0); | |
9f0bdab8 DJ |
1635 | signo = saved_signo; |
1636 | lp->status = 0; | |
1637 | } | |
1638 | } | |
76f50ad1 | 1639 | |
9f0bdab8 DJ |
1640 | if (lp->status) |
1641 | { | |
1642 | /* FIXME: What should we do if we are supposed to continue | |
1643 | this thread with a signal? */ | |
1644 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 | 1645 | |
9f0bdab8 DJ |
1646 | if (debug_linux_nat) |
1647 | fprintf_unfiltered (gdb_stdlog, | |
1648 | "LLR: Short circuiting for status 0x%x\n", | |
1649 | lp->status); | |
d6b0e80f | 1650 | |
7feb7d06 PA |
1651 | restore_child_signals_mask (&prev_mask); |
1652 | if (target_can_async_p ()) | |
1653 | { | |
1654 | target_async (inferior_event_handler, 0); | |
1655 | /* Tell the event loop we have something to process. */ | |
1656 | async_file_mark (); | |
1657 | } | |
9f0bdab8 | 1658 | return; |
d6b0e80f AC |
1659 | } |
1660 | ||
9f0bdab8 DJ |
1661 | /* Mark LWP as not stopped to prevent it from being continued by |
1662 | resume_callback. */ | |
1663 | lp->stopped = 0; | |
1664 | ||
d6b0e80f AC |
1665 | if (resume_all) |
1666 | iterate_over_lwps (resume_callback, NULL); | |
1667 | ||
28439f5e | 1668 | linux_ops->to_resume (linux_ops, ptid, step, signo); |
9f0bdab8 DJ |
1669 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
1670 | ||
d6b0e80f AC |
1671 | if (debug_linux_nat) |
1672 | fprintf_unfiltered (gdb_stdlog, | |
1673 | "LLR: %s %s, %s (resume event thread)\n", | |
1674 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
1675 | target_pid_to_str (ptid), | |
1676 | signo ? strsignal (signo) : "0"); | |
b84876c2 | 1677 | |
7feb7d06 | 1678 | restore_child_signals_mask (&prev_mask); |
b84876c2 | 1679 | if (target_can_async_p ()) |
8ea051c5 | 1680 | target_async (inferior_event_handler, 0); |
d6b0e80f AC |
1681 | } |
1682 | ||
1683 | /* Issue kill to specified lwp. */ | |
1684 | ||
1685 | static int tkill_failed; | |
1686 | ||
1687 | static int | |
1688 | kill_lwp (int lwpid, int signo) | |
1689 | { | |
1690 | errno = 0; | |
1691 | ||
1692 | /* Use tkill, if possible, in case we are using nptl threads. If tkill | |
1693 | fails, then we are not using nptl threads and we should be using kill. */ | |
1694 | ||
1695 | #ifdef HAVE_TKILL_SYSCALL | |
1696 | if (!tkill_failed) | |
1697 | { | |
1698 | int ret = syscall (__NR_tkill, lwpid, signo); | |
1699 | if (errno != ENOSYS) | |
1700 | return ret; | |
1701 | errno = 0; | |
1702 | tkill_failed = 1; | |
1703 | } | |
1704 | #endif | |
1705 | ||
1706 | return kill (lwpid, signo); | |
1707 | } | |
1708 | ||
3d799a95 DJ |
1709 | /* Handle a GNU/Linux extended wait response. If we see a clone |
1710 | event, we need to add the new LWP to our list (and not report the | |
1711 | trap to higher layers). This function returns non-zero if the | |
1712 | event should be ignored and we should wait again. If STOPPING is | |
1713 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
1714 | |
1715 | static int | |
3d799a95 DJ |
1716 | linux_handle_extended_wait (struct lwp_info *lp, int status, |
1717 | int stopping) | |
d6b0e80f | 1718 | { |
3d799a95 DJ |
1719 | int pid = GET_LWP (lp->ptid); |
1720 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
1721 | struct lwp_info *new_lp = NULL; | |
1722 | int event = status >> 16; | |
d6b0e80f | 1723 | |
3d799a95 DJ |
1724 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
1725 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 1726 | { |
3d799a95 DJ |
1727 | unsigned long new_pid; |
1728 | int ret; | |
1729 | ||
1730 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 1731 | |
3d799a95 DJ |
1732 | /* If we haven't already seen the new PID stop, wait for it now. */ |
1733 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
1734 | { | |
1735 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
1736 | hits the SIGSTOP, but we're already attached. */ | |
1737 | ret = my_waitpid (new_pid, &status, | |
1738 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
1739 | if (ret == -1) | |
1740 | perror_with_name (_("waiting for new child")); | |
1741 | else if (ret != new_pid) | |
1742 | internal_error (__FILE__, __LINE__, | |
1743 | _("wait returned unexpected PID %d"), ret); | |
1744 | else if (!WIFSTOPPED (status)) | |
1745 | internal_error (__FILE__, __LINE__, | |
1746 | _("wait returned unexpected status 0x%x"), status); | |
1747 | } | |
1748 | ||
3a3e9ee3 | 1749 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 DJ |
1750 | |
1751 | if (event == PTRACE_EVENT_FORK) | |
1752 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
1753 | else if (event == PTRACE_EVENT_VFORK) | |
1754 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6fc19103 | 1755 | else |
3d799a95 | 1756 | { |
4c28f408 PA |
1757 | struct cleanup *old_chain; |
1758 | ||
3d799a95 DJ |
1759 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
1760 | new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (inferior_ptid))); | |
1761 | new_lp->cloned = 1; | |
4c28f408 | 1762 | new_lp->stopped = 1; |
d6b0e80f | 1763 | |
3d799a95 DJ |
1764 | if (WSTOPSIG (status) != SIGSTOP) |
1765 | { | |
1766 | /* This can happen if someone starts sending signals to | |
1767 | the new thread before it gets a chance to run, which | |
1768 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
1769 | This is an unlikely case, and harder to handle for | |
1770 | fork / vfork than for clone, so we do not try - but | |
1771 | we handle it for clone events here. We'll send | |
1772 | the other signal on to the thread below. */ | |
1773 | ||
1774 | new_lp->signalled = 1; | |
1775 | } | |
1776 | else | |
1777 | status = 0; | |
d6b0e80f | 1778 | |
4c28f408 | 1779 | if (non_stop) |
3d799a95 | 1780 | { |
4c28f408 PA |
1781 | /* Add the new thread to GDB's lists as soon as possible |
1782 | so that: | |
1783 | ||
1784 | 1) the frontend doesn't have to wait for a stop to | |
1785 | display them, and, | |
1786 | ||
1787 | 2) we tag it with the correct running state. */ | |
1788 | ||
1789 | /* If the thread_db layer is active, let it know about | |
1790 | this new thread, and add it to GDB's list. */ | |
1791 | if (!thread_db_attach_lwp (new_lp->ptid)) | |
1792 | { | |
1793 | /* We're not using thread_db. Add it to GDB's | |
1794 | list. */ | |
1795 | target_post_attach (GET_LWP (new_lp->ptid)); | |
1796 | add_thread (new_lp->ptid); | |
1797 | } | |
1798 | ||
1799 | if (!stopping) | |
1800 | { | |
1801 | set_running (new_lp->ptid, 1); | |
1802 | set_executing (new_lp->ptid, 1); | |
1803 | } | |
1804 | } | |
1805 | ||
1806 | if (!stopping) | |
1807 | { | |
1808 | new_lp->stopped = 0; | |
3d799a95 | 1809 | new_lp->resumed = 1; |
4c28f408 | 1810 | ptrace (PTRACE_CONT, new_pid, 0, |
3d799a95 DJ |
1811 | status ? WSTOPSIG (status) : 0); |
1812 | } | |
d6b0e80f | 1813 | |
3d799a95 DJ |
1814 | if (debug_linux_nat) |
1815 | fprintf_unfiltered (gdb_stdlog, | |
1816 | "LHEW: Got clone event from LWP %ld, resuming\n", | |
1817 | GET_LWP (lp->ptid)); | |
1818 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
1819 | ||
1820 | return 1; | |
1821 | } | |
1822 | ||
1823 | return 0; | |
d6b0e80f AC |
1824 | } |
1825 | ||
3d799a95 DJ |
1826 | if (event == PTRACE_EVENT_EXEC) |
1827 | { | |
1828 | ourstatus->kind = TARGET_WAITKIND_EXECD; | |
1829 | ourstatus->value.execd_pathname | |
6d8fd2b7 | 1830 | = xstrdup (linux_child_pid_to_exec_file (pid)); |
3d799a95 DJ |
1831 | |
1832 | if (linux_parent_pid) | |
1833 | { | |
1834 | detach_breakpoints (linux_parent_pid); | |
1835 | ptrace (PTRACE_DETACH, linux_parent_pid, 0, 0); | |
1836 | ||
1837 | linux_parent_pid = 0; | |
1838 | } | |
1839 | ||
25b22b0a PA |
1840 | /* At this point, all inserted breakpoints are gone. Doing this |
1841 | as soon as we detect an exec prevents the badness of deleting | |
1842 | a breakpoint writing the current "shadow contents" to lift | |
1843 | the bp. That shadow is NOT valid after an exec. | |
1844 | ||
1845 | Note that we have to do this after the detach_breakpoints | |
1846 | call above, otherwise breakpoints wouldn't be lifted from the | |
1847 | parent on a vfork, because detach_breakpoints would think | |
1848 | that breakpoints are not inserted. */ | |
1849 | mark_breakpoints_out (); | |
3d799a95 DJ |
1850 | return 0; |
1851 | } | |
1852 | ||
1853 | internal_error (__FILE__, __LINE__, | |
1854 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
1855 | } |
1856 | ||
1857 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has | |
1858 | exited. */ | |
1859 | ||
1860 | static int | |
1861 | wait_lwp (struct lwp_info *lp) | |
1862 | { | |
1863 | pid_t pid; | |
1864 | int status; | |
1865 | int thread_dead = 0; | |
1866 | ||
1867 | gdb_assert (!lp->stopped); | |
1868 | gdb_assert (lp->status == 0); | |
1869 | ||
58aecb61 | 1870 | pid = my_waitpid (GET_LWP (lp->ptid), &status, 0); |
d6b0e80f AC |
1871 | if (pid == -1 && errno == ECHILD) |
1872 | { | |
58aecb61 | 1873 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE); |
d6b0e80f AC |
1874 | if (pid == -1 && errno == ECHILD) |
1875 | { | |
1876 | /* The thread has previously exited. We need to delete it | |
1877 | now because, for some vendor 2.4 kernels with NPTL | |
1878 | support backported, there won't be an exit event unless | |
1879 | it is the main thread. 2.6 kernels will report an exit | |
1880 | event for each thread that exits, as expected. */ | |
1881 | thread_dead = 1; | |
1882 | if (debug_linux_nat) | |
1883 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
1884 | target_pid_to_str (lp->ptid)); | |
1885 | } | |
1886 | } | |
1887 | ||
1888 | if (!thread_dead) | |
1889 | { | |
1890 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
1891 | ||
1892 | if (debug_linux_nat) | |
1893 | { | |
1894 | fprintf_unfiltered (gdb_stdlog, | |
1895 | "WL: waitpid %s received %s\n", | |
1896 | target_pid_to_str (lp->ptid), | |
1897 | status_to_str (status)); | |
1898 | } | |
1899 | } | |
1900 | ||
1901 | /* Check if the thread has exited. */ | |
1902 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
1903 | { | |
1904 | thread_dead = 1; | |
1905 | if (debug_linux_nat) | |
1906 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
1907 | target_pid_to_str (lp->ptid)); | |
1908 | } | |
1909 | ||
1910 | if (thread_dead) | |
1911 | { | |
e26af52f | 1912 | exit_lwp (lp); |
d6b0e80f AC |
1913 | return 0; |
1914 | } | |
1915 | ||
1916 | gdb_assert (WIFSTOPPED (status)); | |
1917 | ||
1918 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
1919 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
1920 | { | |
1921 | if (debug_linux_nat) | |
1922 | fprintf_unfiltered (gdb_stdlog, | |
1923 | "WL: Handling extended status 0x%06x\n", | |
1924 | status); | |
3d799a95 | 1925 | if (linux_handle_extended_wait (lp, status, 1)) |
d6b0e80f AC |
1926 | return wait_lwp (lp); |
1927 | } | |
1928 | ||
1929 | return status; | |
1930 | } | |
1931 | ||
9f0bdab8 DJ |
1932 | /* Save the most recent siginfo for LP. This is currently only called |
1933 | for SIGTRAP; some ports use the si_addr field for | |
1934 | target_stopped_data_address. In the future, it may also be used to | |
1935 | restore the siginfo of requeued signals. */ | |
1936 | ||
1937 | static void | |
1938 | save_siginfo (struct lwp_info *lp) | |
1939 | { | |
1940 | errno = 0; | |
1941 | ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid), | |
1942 | (PTRACE_TYPE_ARG3) 0, &lp->siginfo); | |
1943 | ||
1944 | if (errno != 0) | |
1945 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
1946 | } | |
1947 | ||
d6b0e80f AC |
1948 | /* Send a SIGSTOP to LP. */ |
1949 | ||
1950 | static int | |
1951 | stop_callback (struct lwp_info *lp, void *data) | |
1952 | { | |
1953 | if (!lp->stopped && !lp->signalled) | |
1954 | { | |
1955 | int ret; | |
1956 | ||
1957 | if (debug_linux_nat) | |
1958 | { | |
1959 | fprintf_unfiltered (gdb_stdlog, | |
1960 | "SC: kill %s **<SIGSTOP>**\n", | |
1961 | target_pid_to_str (lp->ptid)); | |
1962 | } | |
1963 | errno = 0; | |
1964 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
1965 | if (debug_linux_nat) | |
1966 | { | |
1967 | fprintf_unfiltered (gdb_stdlog, | |
1968 | "SC: lwp kill %d %s\n", | |
1969 | ret, | |
1970 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
1971 | } | |
1972 | ||
1973 | lp->signalled = 1; | |
1974 | gdb_assert (lp->status == 0); | |
1975 | } | |
1976 | ||
1977 | return 0; | |
1978 | } | |
1979 | ||
57380f4e | 1980 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
1981 | |
1982 | static int | |
57380f4e DJ |
1983 | linux_nat_has_pending_sigint (int pid) |
1984 | { | |
1985 | sigset_t pending, blocked, ignored; | |
1986 | int i; | |
1987 | ||
1988 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
1989 | ||
1990 | if (sigismember (&pending, SIGINT) | |
1991 | && !sigismember (&ignored, SIGINT)) | |
1992 | return 1; | |
1993 | ||
1994 | return 0; | |
1995 | } | |
1996 | ||
1997 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
1998 | ||
1999 | static int | |
2000 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2001 | { |
57380f4e DJ |
2002 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2003 | flag to consume the next one. */ | |
2004 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2005 | && WSTOPSIG (lp->status) == SIGINT) | |
2006 | lp->status = 0; | |
2007 | else | |
2008 | lp->ignore_sigint = 1; | |
2009 | ||
2010 | return 0; | |
2011 | } | |
2012 | ||
2013 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2014 | This function is called after we know the LWP has stopped; if the LWP | |
2015 | stopped before the expected SIGINT was delivered, then it will never have | |
2016 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2017 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2018 | |
57380f4e DJ |
2019 | static void |
2020 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2021 | { | |
2022 | if (!lp->ignore_sigint) | |
2023 | return; | |
2024 | ||
2025 | if (!linux_nat_has_pending_sigint (GET_LWP (lp->ptid))) | |
2026 | { | |
2027 | if (debug_linux_nat) | |
2028 | fprintf_unfiltered (gdb_stdlog, | |
2029 | "MCIS: Clearing bogus flag for %s\n", | |
2030 | target_pid_to_str (lp->ptid)); | |
2031 | lp->ignore_sigint = 0; | |
2032 | } | |
2033 | } | |
2034 | ||
2035 | /* Wait until LP is stopped. */ | |
2036 | ||
2037 | static int | |
2038 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2039 | { | |
d6b0e80f AC |
2040 | if (!lp->stopped) |
2041 | { | |
2042 | int status; | |
2043 | ||
2044 | status = wait_lwp (lp); | |
2045 | if (status == 0) | |
2046 | return 0; | |
2047 | ||
57380f4e DJ |
2048 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2049 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2050 | { |
57380f4e | 2051 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2052 | |
2053 | errno = 0; | |
2054 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2055 | if (debug_linux_nat) | |
2056 | fprintf_unfiltered (gdb_stdlog, | |
57380f4e | 2057 | "PTRACE_CONT %s, 0, 0 (%s) (discarding SIGINT)\n", |
d6b0e80f AC |
2058 | target_pid_to_str (lp->ptid), |
2059 | errno ? safe_strerror (errno) : "OK"); | |
2060 | ||
57380f4e | 2061 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2062 | } |
2063 | ||
57380f4e DJ |
2064 | maybe_clear_ignore_sigint (lp); |
2065 | ||
d6b0e80f AC |
2066 | if (WSTOPSIG (status) != SIGSTOP) |
2067 | { | |
2068 | if (WSTOPSIG (status) == SIGTRAP) | |
2069 | { | |
2070 | /* If a LWP other than the LWP that we're reporting an | |
2071 | event for has hit a GDB breakpoint (as opposed to | |
2072 | some random trap signal), then just arrange for it to | |
2073 | hit it again later. We don't keep the SIGTRAP status | |
2074 | and don't forward the SIGTRAP signal to the LWP. We | |
2075 | will handle the current event, eventually we will | |
2076 | resume all LWPs, and this one will get its breakpoint | |
2077 | trap again. | |
2078 | ||
2079 | If we do not do this, then we run the risk that the | |
2080 | user will delete or disable the breakpoint, but the | |
2081 | thread will have already tripped on it. */ | |
2082 | ||
9f0bdab8 DJ |
2083 | /* Save the trap's siginfo in case we need it later. */ |
2084 | save_siginfo (lp); | |
2085 | ||
d6b0e80f AC |
2086 | /* Now resume this LWP and get the SIGSTOP event. */ |
2087 | errno = 0; | |
2088 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2089 | if (debug_linux_nat) | |
2090 | { | |
2091 | fprintf_unfiltered (gdb_stdlog, | |
2092 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
2093 | target_pid_to_str (lp->ptid), | |
2094 | errno ? safe_strerror (errno) : "OK"); | |
2095 | ||
2096 | fprintf_unfiltered (gdb_stdlog, | |
2097 | "SWC: Candidate SIGTRAP event in %s\n", | |
2098 | target_pid_to_str (lp->ptid)); | |
2099 | } | |
710151dd PA |
2100 | /* Hold this event/waitstatus while we check to see if |
2101 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2102 | stop_wait_callback (lp, NULL); |
710151dd | 2103 | |
7feb7d06 PA |
2104 | /* Hold the SIGTRAP for handling by linux_nat_wait. If |
2105 | there's another event, throw it back into the | |
2106 | queue. */ | |
2107 | if (lp->status) | |
710151dd | 2108 | { |
7feb7d06 PA |
2109 | if (debug_linux_nat) |
2110 | fprintf_unfiltered (gdb_stdlog, | |
2111 | "SWC: kill %s, %s\n", | |
2112 | target_pid_to_str (lp->ptid), | |
2113 | status_to_str ((int) status)); | |
2114 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
d6b0e80f | 2115 | } |
7feb7d06 PA |
2116 | |
2117 | /* Save the sigtrap event. */ | |
2118 | lp->status = status; | |
d6b0e80f AC |
2119 | return 0; |
2120 | } | |
2121 | else | |
2122 | { | |
2123 | /* The thread was stopped with a signal other than | |
2124 | SIGSTOP, and didn't accidentally trip a breakpoint. */ | |
2125 | ||
2126 | if (debug_linux_nat) | |
2127 | { | |
2128 | fprintf_unfiltered (gdb_stdlog, | |
2129 | "SWC: Pending event %s in %s\n", | |
2130 | status_to_str ((int) status), | |
2131 | target_pid_to_str (lp->ptid)); | |
2132 | } | |
2133 | /* Now resume this LWP and get the SIGSTOP event. */ | |
2134 | errno = 0; | |
2135 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2136 | if (debug_linux_nat) | |
2137 | fprintf_unfiltered (gdb_stdlog, | |
2138 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
2139 | target_pid_to_str (lp->ptid), | |
2140 | errno ? safe_strerror (errno) : "OK"); | |
2141 | ||
2142 | /* Hold this event/waitstatus while we check to see if | |
2143 | there are any more (we still want to get that SIGSTOP). */ | |
57380f4e | 2144 | stop_wait_callback (lp, NULL); |
710151dd PA |
2145 | |
2146 | /* If the lp->status field is still empty, use it to | |
2147 | hold this event. If not, then this event must be | |
2148 | returned to the event queue of the LWP. */ | |
7feb7d06 | 2149 | if (lp->status) |
d6b0e80f AC |
2150 | { |
2151 | if (debug_linux_nat) | |
2152 | { | |
2153 | fprintf_unfiltered (gdb_stdlog, | |
2154 | "SWC: kill %s, %s\n", | |
2155 | target_pid_to_str (lp->ptid), | |
2156 | status_to_str ((int) status)); | |
2157 | } | |
2158 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
2159 | } | |
710151dd PA |
2160 | else |
2161 | lp->status = status; | |
d6b0e80f AC |
2162 | return 0; |
2163 | } | |
2164 | } | |
2165 | else | |
2166 | { | |
2167 | /* We caught the SIGSTOP that we intended to catch, so | |
2168 | there's no SIGSTOP pending. */ | |
2169 | lp->stopped = 1; | |
2170 | lp->signalled = 0; | |
2171 | } | |
2172 | } | |
2173 | ||
2174 | return 0; | |
2175 | } | |
2176 | ||
d6b0e80f AC |
2177 | /* Return non-zero if LP has a wait status pending. */ |
2178 | ||
2179 | static int | |
2180 | status_callback (struct lwp_info *lp, void *data) | |
2181 | { | |
2182 | /* Only report a pending wait status if we pretend that this has | |
2183 | indeed been resumed. */ | |
2184 | return (lp->status != 0 && lp->resumed); | |
2185 | } | |
2186 | ||
2187 | /* Return non-zero if LP isn't stopped. */ | |
2188 | ||
2189 | static int | |
2190 | running_callback (struct lwp_info *lp, void *data) | |
2191 | { | |
2192 | return (lp->stopped == 0 || (lp->status != 0 && lp->resumed)); | |
2193 | } | |
2194 | ||
2195 | /* Count the LWP's that have had events. */ | |
2196 | ||
2197 | static int | |
2198 | count_events_callback (struct lwp_info *lp, void *data) | |
2199 | { | |
2200 | int *count = data; | |
2201 | ||
2202 | gdb_assert (count != NULL); | |
2203 | ||
e09490f1 DJ |
2204 | /* Count only resumed LWPs that have a SIGTRAP event pending. */ |
2205 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2206 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2207 | (*count)++; | |
2208 | ||
2209 | return 0; | |
2210 | } | |
2211 | ||
2212 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2213 | ||
2214 | static int | |
2215 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2216 | { | |
2217 | if (lp->step && lp->status != 0) | |
2218 | return 1; | |
2219 | else | |
2220 | return 0; | |
2221 | } | |
2222 | ||
2223 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
2224 | ||
2225 | static int | |
2226 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2227 | { | |
2228 | int *selector = data; | |
2229 | ||
2230 | gdb_assert (selector != NULL); | |
2231 | ||
e09490f1 DJ |
2232 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ |
2233 | if (lp->status != 0 && lp->resumed | |
d6b0e80f AC |
2234 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP) |
2235 | if ((*selector)-- == 0) | |
2236 | return 1; | |
2237 | ||
2238 | return 0; | |
2239 | } | |
2240 | ||
710151dd PA |
2241 | static int |
2242 | cancel_breakpoint (struct lwp_info *lp) | |
2243 | { | |
2244 | /* Arrange for a breakpoint to be hit again later. We don't keep | |
2245 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2246 | LWP. We will handle the current event, eventually we will resume | |
2247 | this LWP, and this breakpoint will trap again. | |
2248 | ||
2249 | If we do not do this, then we run the risk that the user will | |
2250 | delete or disable the breakpoint, but the LWP will have already | |
2251 | tripped on it. */ | |
2252 | ||
515630c5 UW |
2253 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
2254 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
2255 | CORE_ADDR pc; | |
2256 | ||
2257 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); | |
2258 | if (breakpoint_inserted_here_p (pc)) | |
710151dd PA |
2259 | { |
2260 | if (debug_linux_nat) | |
2261 | fprintf_unfiltered (gdb_stdlog, | |
2262 | "CB: Push back breakpoint for %s\n", | |
2263 | target_pid_to_str (lp->ptid)); | |
2264 | ||
2265 | /* Back up the PC if necessary. */ | |
515630c5 UW |
2266 | if (gdbarch_decr_pc_after_break (gdbarch)) |
2267 | regcache_write_pc (regcache, pc); | |
2268 | ||
710151dd PA |
2269 | return 1; |
2270 | } | |
2271 | return 0; | |
2272 | } | |
2273 | ||
d6b0e80f AC |
2274 | static int |
2275 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
2276 | { | |
2277 | struct lwp_info *event_lp = data; | |
2278 | ||
2279 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
2280 | if (lp == event_lp) | |
2281 | return 0; | |
2282 | ||
2283 | /* If a LWP other than the LWP that we're reporting an event for has | |
2284 | hit a GDB breakpoint (as opposed to some random trap signal), | |
2285 | then just arrange for it to hit it again later. We don't keep | |
2286 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2287 | LWP. We will handle the current event, eventually we will resume | |
2288 | all LWPs, and this one will get its breakpoint trap again. | |
2289 | ||
2290 | If we do not do this, then we run the risk that the user will | |
2291 | delete or disable the breakpoint, but the LWP will have already | |
2292 | tripped on it. */ | |
2293 | ||
2294 | if (lp->status != 0 | |
2295 | && WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP | |
710151dd PA |
2296 | && cancel_breakpoint (lp)) |
2297 | /* Throw away the SIGTRAP. */ | |
2298 | lp->status = 0; | |
d6b0e80f AC |
2299 | |
2300 | return 0; | |
2301 | } | |
2302 | ||
2303 | /* Select one LWP out of those that have events pending. */ | |
2304 | ||
2305 | static void | |
2306 | select_event_lwp (struct lwp_info **orig_lp, int *status) | |
2307 | { | |
2308 | int num_events = 0; | |
2309 | int random_selector; | |
2310 | struct lwp_info *event_lp; | |
2311 | ||
ac264b3b | 2312 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
2313 | (*orig_lp)->status = *status; |
2314 | ||
2315 | /* Give preference to any LWP that is being single-stepped. */ | |
2316 | event_lp = iterate_over_lwps (select_singlestep_lwp_callback, NULL); | |
2317 | if (event_lp != NULL) | |
2318 | { | |
2319 | if (debug_linux_nat) | |
2320 | fprintf_unfiltered (gdb_stdlog, | |
2321 | "SEL: Select single-step %s\n", | |
2322 | target_pid_to_str (event_lp->ptid)); | |
2323 | } | |
2324 | else | |
2325 | { | |
2326 | /* No single-stepping LWP. Select one at random, out of those | |
2327 | which have had SIGTRAP events. */ | |
2328 | ||
2329 | /* First see how many SIGTRAP events we have. */ | |
2330 | iterate_over_lwps (count_events_callback, &num_events); | |
2331 | ||
2332 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
2333 | random_selector = (int) | |
2334 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
2335 | ||
2336 | if (debug_linux_nat && num_events > 1) | |
2337 | fprintf_unfiltered (gdb_stdlog, | |
2338 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
2339 | num_events, random_selector); | |
2340 | ||
2341 | event_lp = iterate_over_lwps (select_event_lwp_callback, | |
2342 | &random_selector); | |
2343 | } | |
2344 | ||
2345 | if (event_lp != NULL) | |
2346 | { | |
2347 | /* Switch the event LWP. */ | |
2348 | *orig_lp = event_lp; | |
2349 | *status = event_lp->status; | |
2350 | } | |
2351 | ||
2352 | /* Flush the wait status for the event LWP. */ | |
2353 | (*orig_lp)->status = 0; | |
2354 | } | |
2355 | ||
2356 | /* Return non-zero if LP has been resumed. */ | |
2357 | ||
2358 | static int | |
2359 | resumed_callback (struct lwp_info *lp, void *data) | |
2360 | { | |
2361 | return lp->resumed; | |
2362 | } | |
2363 | ||
d6b0e80f AC |
2364 | /* Stop an active thread, verify it still exists, then resume it. */ |
2365 | ||
2366 | static int | |
2367 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
2368 | { | |
2369 | struct lwp_info *ptr; | |
2370 | ||
2371 | if (!lp->stopped && !lp->signalled) | |
2372 | { | |
2373 | stop_callback (lp, NULL); | |
2374 | stop_wait_callback (lp, NULL); | |
2375 | /* Resume if the lwp still exists. */ | |
2376 | for (ptr = lwp_list; ptr; ptr = ptr->next) | |
2377 | if (lp == ptr) | |
2378 | { | |
2379 | resume_callback (lp, NULL); | |
2380 | resume_set_callback (lp, NULL); | |
2381 | } | |
2382 | } | |
2383 | return 0; | |
2384 | } | |
2385 | ||
02f3fc28 | 2386 | /* Check if we should go on and pass this event to common code. |
fa2c6a57 | 2387 | Return the affected lwp if we are, or NULL otherwise. */ |
02f3fc28 PA |
2388 | static struct lwp_info * |
2389 | linux_nat_filter_event (int lwpid, int status, int options) | |
2390 | { | |
2391 | struct lwp_info *lp; | |
2392 | ||
2393 | lp = find_lwp_pid (pid_to_ptid (lwpid)); | |
2394 | ||
2395 | /* Check for stop events reported by a process we didn't already | |
2396 | know about - anything not already in our LWP list. | |
2397 | ||
2398 | If we're expecting to receive stopped processes after | |
2399 | fork, vfork, and clone events, then we'll just add the | |
2400 | new one to our list and go back to waiting for the event | |
2401 | to be reported - the stopped process might be returned | |
2402 | from waitpid before or after the event is. */ | |
2403 | if (WIFSTOPPED (status) && !lp) | |
2404 | { | |
2405 | linux_record_stopped_pid (lwpid, status); | |
2406 | return NULL; | |
2407 | } | |
2408 | ||
2409 | /* Make sure we don't report an event for the exit of an LWP not in | |
2410 | our list, i.e. not part of the current process. This can happen | |
2411 | if we detach from a program we original forked and then it | |
2412 | exits. */ | |
2413 | if (!WIFSTOPPED (status) && !lp) | |
2414 | return NULL; | |
2415 | ||
2416 | /* NOTE drow/2003-06-17: This code seems to be meant for debugging | |
2417 | CLONE_PTRACE processes which do not use the thread library - | |
2418 | otherwise we wouldn't find the new LWP this way. That doesn't | |
2419 | currently work, and the following code is currently unreachable | |
2420 | due to the two blocks above. If it's fixed some day, this code | |
2421 | should be broken out into a function so that we can also pick up | |
2422 | LWPs from the new interface. */ | |
2423 | if (!lp) | |
2424 | { | |
2425 | lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid))); | |
2426 | if (options & __WCLONE) | |
2427 | lp->cloned = 1; | |
2428 | ||
2429 | gdb_assert (WIFSTOPPED (status) | |
2430 | && WSTOPSIG (status) == SIGSTOP); | |
2431 | lp->signalled = 1; | |
2432 | ||
2433 | if (!in_thread_list (inferior_ptid)) | |
2434 | { | |
2435 | inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), | |
2436 | GET_PID (inferior_ptid)); | |
2437 | add_thread (inferior_ptid); | |
2438 | } | |
2439 | ||
2440 | add_thread (lp->ptid); | |
2441 | } | |
2442 | ||
2443 | /* Save the trap's siginfo in case we need it later. */ | |
2444 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) | |
2445 | save_siginfo (lp); | |
2446 | ||
2447 | /* Handle GNU/Linux's extended waitstatus for trace events. */ | |
2448 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2449 | { | |
2450 | if (debug_linux_nat) | |
2451 | fprintf_unfiltered (gdb_stdlog, | |
2452 | "LLW: Handling extended status 0x%06x\n", | |
2453 | status); | |
2454 | if (linux_handle_extended_wait (lp, status, 0)) | |
2455 | return NULL; | |
2456 | } | |
2457 | ||
2458 | /* Check if the thread has exited. */ | |
2459 | if ((WIFEXITED (status) || WIFSIGNALED (status)) && num_lwps > 1) | |
2460 | { | |
9db03742 JB |
2461 | /* If this is the main thread, we must stop all threads and verify |
2462 | if they are still alive. This is because in the nptl thread model | |
2463 | on Linux 2.4, there is no signal issued for exiting LWPs | |
02f3fc28 PA |
2464 | other than the main thread. We only get the main thread exit |
2465 | signal once all child threads have already exited. If we | |
2466 | stop all the threads and use the stop_wait_callback to check | |
2467 | if they have exited we can determine whether this signal | |
2468 | should be ignored or whether it means the end of the debugged | |
2469 | application, regardless of which threading model is being | |
5d3b6af6 | 2470 | used. */ |
02f3fc28 PA |
2471 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) |
2472 | { | |
2473 | lp->stopped = 1; | |
2474 | iterate_over_lwps (stop_and_resume_callback, NULL); | |
2475 | } | |
2476 | ||
2477 | if (debug_linux_nat) | |
2478 | fprintf_unfiltered (gdb_stdlog, | |
2479 | "LLW: %s exited.\n", | |
2480 | target_pid_to_str (lp->ptid)); | |
2481 | ||
9db03742 JB |
2482 | if (num_lwps > 1) |
2483 | { | |
2484 | /* If there is at least one more LWP, then the exit signal | |
2485 | was not the end of the debugged application and should be | |
2486 | ignored. */ | |
2487 | exit_lwp (lp); | |
2488 | return NULL; | |
2489 | } | |
02f3fc28 PA |
2490 | } |
2491 | ||
2492 | /* Check if the current LWP has previously exited. In the nptl | |
2493 | thread model, LWPs other than the main thread do not issue | |
2494 | signals when they exit so we must check whenever the thread has | |
2495 | stopped. A similar check is made in stop_wait_callback(). */ | |
28439f5e | 2496 | if (num_lwps > 1 && !linux_thread_alive (lp->ptid)) |
02f3fc28 PA |
2497 | { |
2498 | if (debug_linux_nat) | |
2499 | fprintf_unfiltered (gdb_stdlog, | |
2500 | "LLW: %s exited.\n", | |
2501 | target_pid_to_str (lp->ptid)); | |
2502 | ||
2503 | exit_lwp (lp); | |
2504 | ||
2505 | /* Make sure there is at least one thread running. */ | |
2506 | gdb_assert (iterate_over_lwps (running_callback, NULL)); | |
2507 | ||
2508 | /* Discard the event. */ | |
2509 | return NULL; | |
2510 | } | |
2511 | ||
2512 | /* Make sure we don't report a SIGSTOP that we sent ourselves in | |
2513 | an attempt to stop an LWP. */ | |
2514 | if (lp->signalled | |
2515 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
2516 | { | |
2517 | if (debug_linux_nat) | |
2518 | fprintf_unfiltered (gdb_stdlog, | |
2519 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
2520 | target_pid_to_str (lp->ptid)); | |
2521 | ||
2522 | /* This is a delayed SIGSTOP. */ | |
2523 | lp->signalled = 0; | |
2524 | ||
2525 | registers_changed (); | |
2526 | ||
28439f5e | 2527 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
02f3fc28 PA |
2528 | lp->step, TARGET_SIGNAL_0); |
2529 | if (debug_linux_nat) | |
2530 | fprintf_unfiltered (gdb_stdlog, | |
2531 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
2532 | lp->step ? | |
2533 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2534 | target_pid_to_str (lp->ptid)); | |
2535 | ||
2536 | lp->stopped = 0; | |
2537 | gdb_assert (lp->resumed); | |
2538 | ||
2539 | /* Discard the event. */ | |
2540 | return NULL; | |
2541 | } | |
2542 | ||
57380f4e DJ |
2543 | /* Make sure we don't report a SIGINT that we have already displayed |
2544 | for another thread. */ | |
2545 | if (lp->ignore_sigint | |
2546 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
2547 | { | |
2548 | if (debug_linux_nat) | |
2549 | fprintf_unfiltered (gdb_stdlog, | |
2550 | "LLW: Delayed SIGINT caught for %s.\n", | |
2551 | target_pid_to_str (lp->ptid)); | |
2552 | ||
2553 | /* This is a delayed SIGINT. */ | |
2554 | lp->ignore_sigint = 0; | |
2555 | ||
2556 | registers_changed (); | |
28439f5e | 2557 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
57380f4e DJ |
2558 | lp->step, TARGET_SIGNAL_0); |
2559 | if (debug_linux_nat) | |
2560 | fprintf_unfiltered (gdb_stdlog, | |
2561 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
2562 | lp->step ? | |
2563 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2564 | target_pid_to_str (lp->ptid)); | |
2565 | ||
2566 | lp->stopped = 0; | |
2567 | gdb_assert (lp->resumed); | |
2568 | ||
2569 | /* Discard the event. */ | |
2570 | return NULL; | |
2571 | } | |
2572 | ||
02f3fc28 PA |
2573 | /* An interesting event. */ |
2574 | gdb_assert (lp); | |
2575 | return lp; | |
2576 | } | |
2577 | ||
d6b0e80f | 2578 | static ptid_t |
7feb7d06 PA |
2579 | linux_nat_wait_1 (struct target_ops *ops, |
2580 | ptid_t ptid, struct target_waitstatus *ourstatus) | |
d6b0e80f | 2581 | { |
7feb7d06 | 2582 | static sigset_t prev_mask; |
d6b0e80f AC |
2583 | struct lwp_info *lp = NULL; |
2584 | int options = 0; | |
2585 | int status = 0; | |
2586 | pid_t pid = PIDGET (ptid); | |
d6b0e80f | 2587 | |
b84876c2 PA |
2588 | if (debug_linux_nat_async) |
2589 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); | |
2590 | ||
f973ed9c DJ |
2591 | /* The first time we get here after starting a new inferior, we may |
2592 | not have added it to the LWP list yet - this is the earliest | |
2593 | moment at which we know its PID. */ | |
2594 | if (num_lwps == 0) | |
2595 | { | |
2596 | gdb_assert (!is_lwp (inferior_ptid)); | |
2597 | ||
27c9d204 PA |
2598 | /* Upgrade the main thread's ptid. */ |
2599 | thread_change_ptid (inferior_ptid, | |
2600 | BUILD_LWP (GET_PID (inferior_ptid), | |
2601 | GET_PID (inferior_ptid))); | |
2602 | ||
f973ed9c DJ |
2603 | lp = add_lwp (inferior_ptid); |
2604 | lp->resumed = 1; | |
2605 | } | |
2606 | ||
7feb7d06 PA |
2607 | /* Make sure SIGCHLD is blocked. */ |
2608 | block_child_signals (&prev_mask); | |
d6b0e80f AC |
2609 | |
2610 | retry: | |
2611 | ||
f973ed9c DJ |
2612 | /* Make sure there is at least one LWP that has been resumed. */ |
2613 | gdb_assert (iterate_over_lwps (resumed_callback, NULL)); | |
d6b0e80f AC |
2614 | |
2615 | /* First check if there is a LWP with a wait status pending. */ | |
2616 | if (pid == -1) | |
2617 | { | |
2618 | /* Any LWP that's been resumed will do. */ | |
2619 | lp = iterate_over_lwps (status_callback, NULL); | |
2620 | if (lp) | |
2621 | { | |
2622 | status = lp->status; | |
2623 | lp->status = 0; | |
2624 | ||
2625 | if (debug_linux_nat && status) | |
2626 | fprintf_unfiltered (gdb_stdlog, | |
2627 | "LLW: Using pending wait status %s for %s.\n", | |
2628 | status_to_str (status), | |
2629 | target_pid_to_str (lp->ptid)); | |
2630 | } | |
2631 | ||
b84876c2 | 2632 | /* But if we don't find one, we'll have to wait, and check both |
7feb7d06 PA |
2633 | cloned and uncloned processes. We start with the cloned |
2634 | processes. */ | |
d6b0e80f AC |
2635 | options = __WCLONE | WNOHANG; |
2636 | } | |
2637 | else if (is_lwp (ptid)) | |
2638 | { | |
2639 | if (debug_linux_nat) | |
2640 | fprintf_unfiltered (gdb_stdlog, | |
2641 | "LLW: Waiting for specific LWP %s.\n", | |
2642 | target_pid_to_str (ptid)); | |
2643 | ||
2644 | /* We have a specific LWP to check. */ | |
2645 | lp = find_lwp_pid (ptid); | |
2646 | gdb_assert (lp); | |
2647 | status = lp->status; | |
2648 | lp->status = 0; | |
2649 | ||
2650 | if (debug_linux_nat && status) | |
2651 | fprintf_unfiltered (gdb_stdlog, | |
2652 | "LLW: Using pending wait status %s for %s.\n", | |
2653 | status_to_str (status), | |
2654 | target_pid_to_str (lp->ptid)); | |
2655 | ||
2656 | /* If we have to wait, take into account whether PID is a cloned | |
2657 | process or not. And we have to convert it to something that | |
2658 | the layer beneath us can understand. */ | |
2659 | options = lp->cloned ? __WCLONE : 0; | |
2660 | pid = GET_LWP (ptid); | |
2661 | } | |
2662 | ||
2663 | if (status && lp->signalled) | |
2664 | { | |
2665 | /* A pending SIGSTOP may interfere with the normal stream of | |
2666 | events. In a typical case where interference is a problem, | |
2667 | we have a SIGSTOP signal pending for LWP A while | |
2668 | single-stepping it, encounter an event in LWP B, and take the | |
2669 | pending SIGSTOP while trying to stop LWP A. After processing | |
2670 | the event in LWP B, LWP A is continued, and we'll never see | |
2671 | the SIGTRAP associated with the last time we were | |
2672 | single-stepping LWP A. */ | |
2673 | ||
2674 | /* Resume the thread. It should halt immediately returning the | |
2675 | pending SIGSTOP. */ | |
2676 | registers_changed (); | |
28439f5e | 2677 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 2678 | lp->step, TARGET_SIGNAL_0); |
d6b0e80f AC |
2679 | if (debug_linux_nat) |
2680 | fprintf_unfiltered (gdb_stdlog, | |
2681 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
2682 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2683 | target_pid_to_str (lp->ptid)); | |
2684 | lp->stopped = 0; | |
2685 | gdb_assert (lp->resumed); | |
2686 | ||
2687 | /* This should catch the pending SIGSTOP. */ | |
2688 | stop_wait_callback (lp, NULL); | |
2689 | } | |
2690 | ||
b84876c2 PA |
2691 | if (!target_can_async_p ()) |
2692 | { | |
2693 | /* Causes SIGINT to be passed on to the attached process. */ | |
2694 | set_sigint_trap (); | |
b84876c2 | 2695 | } |
d6b0e80f | 2696 | |
7feb7d06 PA |
2697 | if (target_can_async_p ()) |
2698 | options |= WNOHANG; /* In async mode, don't block. */ | |
2699 | ||
d6b0e80f AC |
2700 | while (status == 0) |
2701 | { | |
2702 | pid_t lwpid; | |
2703 | ||
7feb7d06 | 2704 | lwpid = my_waitpid (pid, &status, options); |
b84876c2 | 2705 | |
d6b0e80f AC |
2706 | if (lwpid > 0) |
2707 | { | |
2708 | gdb_assert (pid == -1 || lwpid == pid); | |
2709 | ||
2710 | if (debug_linux_nat) | |
2711 | { | |
2712 | fprintf_unfiltered (gdb_stdlog, | |
2713 | "LLW: waitpid %ld received %s\n", | |
2714 | (long) lwpid, status_to_str (status)); | |
2715 | } | |
2716 | ||
02f3fc28 | 2717 | lp = linux_nat_filter_event (lwpid, status, options); |
d6b0e80f AC |
2718 | if (!lp) |
2719 | { | |
02f3fc28 | 2720 | /* A discarded event. */ |
d6b0e80f AC |
2721 | status = 0; |
2722 | continue; | |
2723 | } | |
2724 | ||
2725 | break; | |
2726 | } | |
2727 | ||
2728 | if (pid == -1) | |
2729 | { | |
2730 | /* Alternate between checking cloned and uncloned processes. */ | |
2731 | options ^= __WCLONE; | |
2732 | ||
b84876c2 PA |
2733 | /* And every time we have checked both: |
2734 | In async mode, return to event loop; | |
2735 | In sync mode, suspend waiting for a SIGCHLD signal. */ | |
d6b0e80f | 2736 | if (options & __WCLONE) |
b84876c2 PA |
2737 | { |
2738 | if (target_can_async_p ()) | |
2739 | { | |
2740 | /* No interesting event. */ | |
2741 | ourstatus->kind = TARGET_WAITKIND_IGNORE; | |
2742 | ||
b84876c2 PA |
2743 | if (debug_linux_nat_async) |
2744 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); | |
2745 | ||
7feb7d06 | 2746 | restore_child_signals_mask (&prev_mask); |
b84876c2 PA |
2747 | return minus_one_ptid; |
2748 | } | |
2749 | ||
2750 | sigsuspend (&suspend_mask); | |
2751 | } | |
d6b0e80f AC |
2752 | } |
2753 | ||
2754 | /* We shouldn't end up here unless we want to try again. */ | |
2755 | gdb_assert (status == 0); | |
2756 | } | |
2757 | ||
b84876c2 | 2758 | if (!target_can_async_p ()) |
d26b5354 | 2759 | clear_sigint_trap (); |
d6b0e80f AC |
2760 | |
2761 | gdb_assert (lp); | |
2762 | ||
2763 | /* Don't report signals that GDB isn't interested in, such as | |
2764 | signals that are neither printed nor stopped upon. Stopping all | |
2765 | threads can be a bit time-consuming so if we want decent | |
2766 | performance with heavily multi-threaded programs, especially when | |
2767 | they're using a high frequency timer, we'd better avoid it if we | |
2768 | can. */ | |
2769 | ||
2770 | if (WIFSTOPPED (status)) | |
2771 | { | |
2772 | int signo = target_signal_from_host (WSTOPSIG (status)); | |
d6b48e9c PA |
2773 | struct inferior *inf; |
2774 | ||
2775 | inf = find_inferior_pid (ptid_get_pid (lp->ptid)); | |
2776 | gdb_assert (inf); | |
d6b0e80f | 2777 | |
d6b48e9c PA |
2778 | /* Defer to common code if we get a signal while |
2779 | single-stepping, since that may need special care, e.g. to | |
2780 | skip the signal handler, or, if we're gaining control of the | |
2781 | inferior. */ | |
d539ed7e | 2782 | if (!lp->step |
d6b48e9c | 2783 | && inf->stop_soon == NO_STOP_QUIETLY |
d539ed7e | 2784 | && signal_stop_state (signo) == 0 |
d6b0e80f AC |
2785 | && signal_print_state (signo) == 0 |
2786 | && signal_pass_state (signo) == 1) | |
2787 | { | |
2788 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
2789 | here? It is not clear we should. GDB may not expect | |
2790 | other threads to run. On the other hand, not resuming | |
2791 | newly attached threads may cause an unwanted delay in | |
2792 | getting them running. */ | |
2793 | registers_changed (); | |
28439f5e | 2794 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 2795 | lp->step, signo); |
d6b0e80f AC |
2796 | if (debug_linux_nat) |
2797 | fprintf_unfiltered (gdb_stdlog, | |
2798 | "LLW: %s %s, %s (preempt 'handle')\n", | |
2799 | lp->step ? | |
2800 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
2801 | target_pid_to_str (lp->ptid), | |
2802 | signo ? strsignal (signo) : "0"); | |
2803 | lp->stopped = 0; | |
2804 | status = 0; | |
2805 | goto retry; | |
2806 | } | |
2807 | ||
1ad15515 | 2808 | if (!non_stop) |
d6b0e80f | 2809 | { |
1ad15515 PA |
2810 | /* Only do the below in all-stop, as we currently use SIGINT |
2811 | to implement target_stop (see linux_nat_stop) in | |
2812 | non-stop. */ | |
2813 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
2814 | { | |
2815 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
2816 | forwarded to the entire process group, that is, all LWPs | |
2817 | will receive it - unless they're using CLONE_THREAD to | |
2818 | share signals. Since we only want to report it once, we | |
2819 | mark it as ignored for all LWPs except this one. */ | |
2820 | iterate_over_lwps (set_ignore_sigint, NULL); | |
2821 | lp->ignore_sigint = 0; | |
2822 | } | |
2823 | else | |
2824 | maybe_clear_ignore_sigint (lp); | |
d6b0e80f AC |
2825 | } |
2826 | } | |
2827 | ||
2828 | /* This LWP is stopped now. */ | |
2829 | lp->stopped = 1; | |
2830 | ||
2831 | if (debug_linux_nat) | |
2832 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
2833 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
2834 | ||
4c28f408 PA |
2835 | if (!non_stop) |
2836 | { | |
2837 | /* Now stop all other LWP's ... */ | |
2838 | iterate_over_lwps (stop_callback, NULL); | |
2839 | ||
2840 | /* ... and wait until all of them have reported back that | |
2841 | they're no longer running. */ | |
57380f4e | 2842 | iterate_over_lwps (stop_wait_callback, NULL); |
4c28f408 PA |
2843 | |
2844 | /* If we're not waiting for a specific LWP, choose an event LWP | |
2845 | from among those that have had events. Giving equal priority | |
2846 | to all LWPs that have had events helps prevent | |
2847 | starvation. */ | |
2848 | if (pid == -1) | |
2849 | select_event_lwp (&lp, &status); | |
2850 | } | |
d6b0e80f AC |
2851 | |
2852 | /* Now that we've selected our final event LWP, cancel any | |
2853 | breakpoints in other LWPs that have hit a GDB breakpoint. See | |
2854 | the comment in cancel_breakpoints_callback to find out why. */ | |
2855 | iterate_over_lwps (cancel_breakpoints_callback, lp); | |
2856 | ||
d6b0e80f AC |
2857 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP) |
2858 | { | |
d6b0e80f AC |
2859 | if (debug_linux_nat) |
2860 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
2861 | "LLW: trap ptid is %s.\n", |
2862 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 2863 | } |
d6b0e80f AC |
2864 | |
2865 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2866 | { | |
2867 | *ourstatus = lp->waitstatus; | |
2868 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
2869 | } | |
2870 | else | |
2871 | store_waitstatus (ourstatus, status); | |
2872 | ||
b84876c2 PA |
2873 | if (debug_linux_nat_async) |
2874 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); | |
2875 | ||
7feb7d06 | 2876 | restore_child_signals_mask (&prev_mask); |
f973ed9c | 2877 | return lp->ptid; |
d6b0e80f AC |
2878 | } |
2879 | ||
7feb7d06 PA |
2880 | static ptid_t |
2881 | linux_nat_wait (struct target_ops *ops, | |
2882 | ptid_t ptid, struct target_waitstatus *ourstatus) | |
2883 | { | |
2884 | ptid_t event_ptid; | |
2885 | ||
2886 | if (debug_linux_nat) | |
2887 | fprintf_unfiltered (gdb_stdlog, "linux_nat_wait: [%s]\n", target_pid_to_str (ptid)); | |
2888 | ||
2889 | /* Flush the async file first. */ | |
2890 | if (target_can_async_p ()) | |
2891 | async_file_flush (); | |
2892 | ||
2893 | event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus); | |
2894 | ||
2895 | /* If we requested any event, and something came out, assume there | |
2896 | may be more. If we requested a specific lwp or process, also | |
2897 | assume there may be more. */ | |
2898 | if (target_can_async_p () | |
2899 | && (ourstatus->kind != TARGET_WAITKIND_IGNORE | |
2900 | || !ptid_equal (ptid, minus_one_ptid))) | |
2901 | async_file_mark (); | |
2902 | ||
2903 | /* Get ready for the next event. */ | |
2904 | if (target_can_async_p ()) | |
2905 | target_async (inferior_event_handler, 0); | |
2906 | ||
2907 | return event_ptid; | |
2908 | } | |
2909 | ||
d6b0e80f AC |
2910 | static int |
2911 | kill_callback (struct lwp_info *lp, void *data) | |
2912 | { | |
2913 | errno = 0; | |
2914 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
2915 | if (debug_linux_nat) | |
2916 | fprintf_unfiltered (gdb_stdlog, | |
2917 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
2918 | target_pid_to_str (lp->ptid), | |
2919 | errno ? safe_strerror (errno) : "OK"); | |
2920 | ||
2921 | return 0; | |
2922 | } | |
2923 | ||
2924 | static int | |
2925 | kill_wait_callback (struct lwp_info *lp, void *data) | |
2926 | { | |
2927 | pid_t pid; | |
2928 | ||
2929 | /* We must make sure that there are no pending events (delayed | |
2930 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
2931 | program doesn't interfere with any following debugging session. */ | |
2932 | ||
2933 | /* For cloned processes we must check both with __WCLONE and | |
2934 | without, since the exit status of a cloned process isn't reported | |
2935 | with __WCLONE. */ | |
2936 | if (lp->cloned) | |
2937 | { | |
2938 | do | |
2939 | { | |
58aecb61 | 2940 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
e85a822c | 2941 | if (pid != (pid_t) -1) |
d6b0e80f | 2942 | { |
e85a822c DJ |
2943 | if (debug_linux_nat) |
2944 | fprintf_unfiltered (gdb_stdlog, | |
2945 | "KWC: wait %s received unknown.\n", | |
2946 | target_pid_to_str (lp->ptid)); | |
2947 | /* The Linux kernel sometimes fails to kill a thread | |
2948 | completely after PTRACE_KILL; that goes from the stop | |
2949 | point in do_fork out to the one in | |
2950 | get_signal_to_deliever and waits again. So kill it | |
2951 | again. */ | |
2952 | kill_callback (lp, NULL); | |
d6b0e80f AC |
2953 | } |
2954 | } | |
2955 | while (pid == GET_LWP (lp->ptid)); | |
2956 | ||
2957 | gdb_assert (pid == -1 && errno == ECHILD); | |
2958 | } | |
2959 | ||
2960 | do | |
2961 | { | |
58aecb61 | 2962 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
e85a822c | 2963 | if (pid != (pid_t) -1) |
d6b0e80f | 2964 | { |
e85a822c DJ |
2965 | if (debug_linux_nat) |
2966 | fprintf_unfiltered (gdb_stdlog, | |
2967 | "KWC: wait %s received unk.\n", | |
2968 | target_pid_to_str (lp->ptid)); | |
2969 | /* See the call to kill_callback above. */ | |
2970 | kill_callback (lp, NULL); | |
d6b0e80f AC |
2971 | } |
2972 | } | |
2973 | while (pid == GET_LWP (lp->ptid)); | |
2974 | ||
2975 | gdb_assert (pid == -1 && errno == ECHILD); | |
2976 | return 0; | |
2977 | } | |
2978 | ||
2979 | static void | |
7d85a9c0 | 2980 | linux_nat_kill (struct target_ops *ops) |
d6b0e80f | 2981 | { |
f973ed9c DJ |
2982 | struct target_waitstatus last; |
2983 | ptid_t last_ptid; | |
2984 | int status; | |
d6b0e80f | 2985 | |
f973ed9c DJ |
2986 | /* If we're stopped while forking and we haven't followed yet, |
2987 | kill the other task. We need to do this first because the | |
2988 | parent will be sleeping if this is a vfork. */ | |
d6b0e80f | 2989 | |
f973ed9c | 2990 | get_last_target_status (&last_ptid, &last); |
d6b0e80f | 2991 | |
f973ed9c DJ |
2992 | if (last.kind == TARGET_WAITKIND_FORKED |
2993 | || last.kind == TARGET_WAITKIND_VFORKED) | |
2994 | { | |
3a3e9ee3 | 2995 | ptrace (PT_KILL, PIDGET (last.value.related_pid), 0, 0); |
f973ed9c DJ |
2996 | wait (&status); |
2997 | } | |
2998 | ||
2999 | if (forks_exist_p ()) | |
7feb7d06 | 3000 | linux_fork_killall (); |
f973ed9c DJ |
3001 | else |
3002 | { | |
4c28f408 PA |
3003 | /* Stop all threads before killing them, since ptrace requires |
3004 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
3005 | iterate_over_lwps (stop_callback, NULL); | |
3006 | /* ... and wait until all of them have reported back that | |
3007 | they're no longer running. */ | |
3008 | iterate_over_lwps (stop_wait_callback, NULL); | |
3009 | ||
f973ed9c DJ |
3010 | /* Kill all LWP's ... */ |
3011 | iterate_over_lwps (kill_callback, NULL); | |
3012 | ||
3013 | /* ... and wait until we've flushed all events. */ | |
3014 | iterate_over_lwps (kill_wait_callback, NULL); | |
3015 | } | |
3016 | ||
3017 | target_mourn_inferior (); | |
d6b0e80f AC |
3018 | } |
3019 | ||
3020 | static void | |
136d6dae | 3021 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 3022 | { |
d6b0e80f AC |
3023 | /* Destroy LWP info; it's no longer valid. */ |
3024 | init_lwp_list (); | |
3025 | ||
f973ed9c | 3026 | if (! forks_exist_p ()) |
b84876c2 PA |
3027 | { |
3028 | /* Normal case, no other forks available. */ | |
7feb7d06 PA |
3029 | linux_ops->to_mourn_inferior (ops); |
3030 | ||
b84876c2 PA |
3031 | if (target_can_async_p ()) |
3032 | linux_nat_async (NULL, 0); | |
b84876c2 | 3033 | } |
f973ed9c DJ |
3034 | else |
3035 | /* Multi-fork case. The current inferior_ptid has exited, but | |
3036 | there are other viable forks to debug. Delete the exiting | |
3037 | one and context-switch to the first available. */ | |
3038 | linux_fork_mourn_inferior (); | |
d6b0e80f AC |
3039 | } |
3040 | ||
5b009018 PA |
3041 | /* Convert a native/host siginfo object, into/from the siginfo in the |
3042 | layout of the inferiors' architecture. */ | |
3043 | ||
3044 | static void | |
3045 | siginfo_fixup (struct siginfo *siginfo, gdb_byte *inf_siginfo, int direction) | |
3046 | { | |
3047 | int done = 0; | |
3048 | ||
3049 | if (linux_nat_siginfo_fixup != NULL) | |
3050 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
3051 | ||
3052 | /* If there was no callback, or the callback didn't do anything, | |
3053 | then just do a straight memcpy. */ | |
3054 | if (!done) | |
3055 | { | |
3056 | if (direction == 1) | |
3057 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
3058 | else | |
3059 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
3060 | } | |
3061 | } | |
3062 | ||
4aa995e1 PA |
3063 | static LONGEST |
3064 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, | |
3065 | const char *annex, gdb_byte *readbuf, | |
3066 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
3067 | { | |
4aa995e1 PA |
3068 | int pid; |
3069 | struct siginfo siginfo; | |
5b009018 | 3070 | gdb_byte inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
3071 | |
3072 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
3073 | gdb_assert (readbuf || writebuf); | |
3074 | ||
3075 | pid = GET_LWP (inferior_ptid); | |
3076 | if (pid == 0) | |
3077 | pid = GET_PID (inferior_ptid); | |
3078 | ||
3079 | if (offset > sizeof (siginfo)) | |
3080 | return -1; | |
3081 | ||
3082 | errno = 0; | |
3083 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3084 | if (errno != 0) | |
3085 | return -1; | |
3086 | ||
5b009018 PA |
3087 | /* When GDB is built as a 64-bit application, ptrace writes into |
3088 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
3089 | inferior with a 64-bit GDB should look the same as debugging it | |
3090 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
3091 | the converted layout, so any read/write will have to be done | |
3092 | post-conversion. */ | |
3093 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
3094 | ||
4aa995e1 PA |
3095 | if (offset + len > sizeof (siginfo)) |
3096 | len = sizeof (siginfo) - offset; | |
3097 | ||
3098 | if (readbuf != NULL) | |
5b009018 | 3099 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
3100 | else |
3101 | { | |
5b009018 PA |
3102 | memcpy (inf_siginfo + offset, writebuf, len); |
3103 | ||
3104 | /* Convert back to ptrace layout before flushing it out. */ | |
3105 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
3106 | ||
4aa995e1 PA |
3107 | errno = 0; |
3108 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
3109 | if (errno != 0) | |
3110 | return -1; | |
3111 | } | |
3112 | ||
3113 | return len; | |
3114 | } | |
3115 | ||
10d6c8cd DJ |
3116 | static LONGEST |
3117 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
3118 | const char *annex, gdb_byte *readbuf, | |
3119 | const gdb_byte *writebuf, | |
3120 | ULONGEST offset, LONGEST len) | |
d6b0e80f | 3121 | { |
4aa995e1 | 3122 | struct cleanup *old_chain; |
10d6c8cd | 3123 | LONGEST xfer; |
d6b0e80f | 3124 | |
4aa995e1 PA |
3125 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
3126 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
3127 | offset, len); | |
3128 | ||
3129 | old_chain = save_inferior_ptid (); | |
3130 | ||
d6b0e80f AC |
3131 | if (is_lwp (inferior_ptid)) |
3132 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
3133 | ||
10d6c8cd DJ |
3134 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
3135 | offset, len); | |
d6b0e80f AC |
3136 | |
3137 | do_cleanups (old_chain); | |
3138 | return xfer; | |
3139 | } | |
3140 | ||
3141 | static int | |
28439f5e | 3142 | linux_thread_alive (ptid_t ptid) |
d6b0e80f | 3143 | { |
4c28f408 PA |
3144 | int err; |
3145 | ||
d6b0e80f AC |
3146 | gdb_assert (is_lwp (ptid)); |
3147 | ||
4c28f408 PA |
3148 | /* Send signal 0 instead of anything ptrace, because ptracing a |
3149 | running thread errors out claiming that the thread doesn't | |
3150 | exist. */ | |
3151 | err = kill_lwp (GET_LWP (ptid), 0); | |
3152 | ||
d6b0e80f AC |
3153 | if (debug_linux_nat) |
3154 | fprintf_unfiltered (gdb_stdlog, | |
4c28f408 | 3155 | "LLTA: KILL(SIG0) %s (%s)\n", |
d6b0e80f | 3156 | target_pid_to_str (ptid), |
4c28f408 | 3157 | err ? safe_strerror (err) : "OK"); |
9c0dd46b | 3158 | |
4c28f408 | 3159 | if (err != 0) |
d6b0e80f AC |
3160 | return 0; |
3161 | ||
3162 | return 1; | |
3163 | } | |
3164 | ||
28439f5e PA |
3165 | static int |
3166 | linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid) | |
3167 | { | |
3168 | return linux_thread_alive (ptid); | |
3169 | } | |
3170 | ||
d6b0e80f | 3171 | static char * |
117de6a9 | 3172 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
3173 | { |
3174 | static char buf[64]; | |
3175 | ||
a0ef4274 DJ |
3176 | if (is_lwp (ptid) |
3177 | && ((lwp_list && lwp_list->next) | |
3178 | || GET_PID (ptid) != GET_LWP (ptid))) | |
d6b0e80f AC |
3179 | { |
3180 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
3181 | return buf; | |
3182 | } | |
3183 | ||
3184 | return normal_pid_to_str (ptid); | |
3185 | } | |
3186 | ||
dba24537 AC |
3187 | /* Accepts an integer PID; Returns a string representing a file that |
3188 | can be opened to get the symbols for the child process. */ | |
3189 | ||
6d8fd2b7 UW |
3190 | static char * |
3191 | linux_child_pid_to_exec_file (int pid) | |
dba24537 AC |
3192 | { |
3193 | char *name1, *name2; | |
3194 | ||
3195 | name1 = xmalloc (MAXPATHLEN); | |
3196 | name2 = xmalloc (MAXPATHLEN); | |
3197 | make_cleanup (xfree, name1); | |
3198 | make_cleanup (xfree, name2); | |
3199 | memset (name2, 0, MAXPATHLEN); | |
3200 | ||
3201 | sprintf (name1, "/proc/%d/exe", pid); | |
3202 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
3203 | return name2; | |
3204 | else | |
3205 | return name1; | |
3206 | } | |
3207 | ||
3208 | /* Service function for corefiles and info proc. */ | |
3209 | ||
3210 | static int | |
3211 | read_mapping (FILE *mapfile, | |
3212 | long long *addr, | |
3213 | long long *endaddr, | |
3214 | char *permissions, | |
3215 | long long *offset, | |
3216 | char *device, long long *inode, char *filename) | |
3217 | { | |
3218 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
3219 | addr, endaddr, permissions, offset, device, inode); | |
3220 | ||
2e14c2ea MS |
3221 | filename[0] = '\0'; |
3222 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
3223 | { |
3224 | /* Eat everything up to EOL for the filename. This will prevent | |
3225 | weird filenames (such as one with embedded whitespace) from | |
3226 | confusing this code. It also makes this code more robust in | |
3227 | respect to annotations the kernel may add after the filename. | |
3228 | ||
3229 | Note the filename is used for informational purposes | |
3230 | only. */ | |
3231 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
3232 | } | |
2e14c2ea | 3233 | |
dba24537 AC |
3234 | return (ret != 0 && ret != EOF); |
3235 | } | |
3236 | ||
3237 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
3238 | regions in the inferior for a corefile. */ | |
3239 | ||
3240 | static int | |
3241 | linux_nat_find_memory_regions (int (*func) (CORE_ADDR, | |
3242 | unsigned long, | |
3243 | int, int, int, void *), void *obfd) | |
3244 | { | |
89ecc4f5 | 3245 | int pid = PIDGET (inferior_ptid); |
dba24537 AC |
3246 | char mapsfilename[MAXPATHLEN]; |
3247 | FILE *mapsfile; | |
3248 | long long addr, endaddr, size, offset, inode; | |
3249 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
3250 | int read, write, exec; | |
3251 | int ret; | |
7c8a8b04 | 3252 | struct cleanup *cleanup; |
dba24537 AC |
3253 | |
3254 | /* Compose the filename for the /proc memory map, and open it. */ | |
89ecc4f5 | 3255 | sprintf (mapsfilename, "/proc/%d/maps", pid); |
dba24537 | 3256 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) |
8a3fe4f8 | 3257 | error (_("Could not open %s."), mapsfilename); |
7c8a8b04 | 3258 | cleanup = make_cleanup_fclose (mapsfile); |
dba24537 AC |
3259 | |
3260 | if (info_verbose) | |
3261 | fprintf_filtered (gdb_stdout, | |
3262 | "Reading memory regions from %s\n", mapsfilename); | |
3263 | ||
3264 | /* Now iterate until end-of-file. */ | |
3265 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
3266 | &offset, &device[0], &inode, &filename[0])) | |
3267 | { | |
3268 | size = endaddr - addr; | |
3269 | ||
3270 | /* Get the segment's permissions. */ | |
3271 | read = (strchr (permissions, 'r') != 0); | |
3272 | write = (strchr (permissions, 'w') != 0); | |
3273 | exec = (strchr (permissions, 'x') != 0); | |
3274 | ||
3275 | if (info_verbose) | |
3276 | { | |
3277 | fprintf_filtered (gdb_stdout, | |
3278 | "Save segment, %lld bytes at 0x%s (%c%c%c)", | |
3279 | size, paddr_nz (addr), | |
3280 | read ? 'r' : ' ', | |
3281 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
b260b6c1 | 3282 | if (filename[0]) |
dba24537 AC |
3283 | fprintf_filtered (gdb_stdout, " for %s", filename); |
3284 | fprintf_filtered (gdb_stdout, "\n"); | |
3285 | } | |
3286 | ||
3287 | /* Invoke the callback function to create the corefile | |
3288 | segment. */ | |
3289 | func (addr, size, read, write, exec, obfd); | |
3290 | } | |
7c8a8b04 | 3291 | do_cleanups (cleanup); |
dba24537 AC |
3292 | return 0; |
3293 | } | |
3294 | ||
2020b7ab PA |
3295 | static int |
3296 | find_signalled_thread (struct thread_info *info, void *data) | |
3297 | { | |
3298 | if (info->stop_signal != TARGET_SIGNAL_0 | |
3299 | && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) | |
3300 | return 1; | |
3301 | ||
3302 | return 0; | |
3303 | } | |
3304 | ||
3305 | static enum target_signal | |
3306 | find_stop_signal (void) | |
3307 | { | |
3308 | struct thread_info *info = | |
3309 | iterate_over_threads (find_signalled_thread, NULL); | |
3310 | ||
3311 | if (info) | |
3312 | return info->stop_signal; | |
3313 | else | |
3314 | return TARGET_SIGNAL_0; | |
3315 | } | |
3316 | ||
dba24537 AC |
3317 | /* Records the thread's register state for the corefile note |
3318 | section. */ | |
3319 | ||
3320 | static char * | |
3321 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2020b7ab PA |
3322 | char *note_data, int *note_size, |
3323 | enum target_signal stop_signal) | |
dba24537 AC |
3324 | { |
3325 | gdb_gregset_t gregs; | |
3326 | gdb_fpregset_t fpregs; | |
dba24537 | 3327 | unsigned long lwp = ptid_get_lwp (ptid); |
594f7785 UW |
3328 | struct regcache *regcache = get_thread_regcache (ptid); |
3329 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
4f844a66 | 3330 | const struct regset *regset; |
55e969c1 | 3331 | int core_regset_p; |
594f7785 | 3332 | struct cleanup *old_chain; |
17ea7499 CES |
3333 | struct core_regset_section *sect_list; |
3334 | char *gdb_regset; | |
594f7785 UW |
3335 | |
3336 | old_chain = save_inferior_ptid (); | |
3337 | inferior_ptid = ptid; | |
3338 | target_fetch_registers (regcache, -1); | |
3339 | do_cleanups (old_chain); | |
4f844a66 DM |
3340 | |
3341 | core_regset_p = gdbarch_regset_from_core_section_p (gdbarch); | |
17ea7499 CES |
3342 | sect_list = gdbarch_core_regset_sections (gdbarch); |
3343 | ||
55e969c1 DM |
3344 | if (core_regset_p |
3345 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg", | |
3346 | sizeof (gregs))) != NULL | |
3347 | && regset->collect_regset != NULL) | |
594f7785 | 3348 | regset->collect_regset (regset, regcache, -1, |
55e969c1 | 3349 | &gregs, sizeof (gregs)); |
4f844a66 | 3350 | else |
594f7785 | 3351 | fill_gregset (regcache, &gregs, -1); |
4f844a66 | 3352 | |
55e969c1 DM |
3353 | note_data = (char *) elfcore_write_prstatus (obfd, |
3354 | note_data, | |
3355 | note_size, | |
3356 | lwp, | |
3357 | stop_signal, &gregs); | |
3358 | ||
17ea7499 CES |
3359 | /* The loop below uses the new struct core_regset_section, which stores |
3360 | the supported section names and sizes for the core file. Note that | |
3361 | note PRSTATUS needs to be treated specially. But the other notes are | |
3362 | structurally the same, so they can benefit from the new struct. */ | |
3363 | if (core_regset_p && sect_list != NULL) | |
3364 | while (sect_list->sect_name != NULL) | |
3365 | { | |
3366 | /* .reg was already handled above. */ | |
3367 | if (strcmp (sect_list->sect_name, ".reg") == 0) | |
3368 | { | |
3369 | sect_list++; | |
3370 | continue; | |
3371 | } | |
3372 | regset = gdbarch_regset_from_core_section (gdbarch, | |
3373 | sect_list->sect_name, | |
3374 | sect_list->size); | |
3375 | gdb_assert (regset && regset->collect_regset); | |
3376 | gdb_regset = xmalloc (sect_list->size); | |
3377 | regset->collect_regset (regset, regcache, -1, | |
3378 | gdb_regset, sect_list->size); | |
3379 | note_data = (char *) elfcore_write_register_note (obfd, | |
3380 | note_data, | |
3381 | note_size, | |
3382 | sect_list->sect_name, | |
3383 | gdb_regset, | |
3384 | sect_list->size); | |
3385 | xfree (gdb_regset); | |
3386 | sect_list++; | |
3387 | } | |
dba24537 | 3388 | |
17ea7499 CES |
3389 | /* For architectures that does not have the struct core_regset_section |
3390 | implemented, we use the old method. When all the architectures have | |
3391 | the new support, the code below should be deleted. */ | |
4f844a66 | 3392 | else |
17ea7499 CES |
3393 | { |
3394 | if (core_regset_p | |
3395 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", | |
3396 | sizeof (fpregs))) != NULL | |
3397 | && regset->collect_regset != NULL) | |
3398 | regset->collect_regset (regset, regcache, -1, | |
3399 | &fpregs, sizeof (fpregs)); | |
3400 | else | |
3401 | fill_fpregset (regcache, &fpregs, -1); | |
3402 | ||
3403 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
3404 | note_data, | |
3405 | note_size, | |
3406 | &fpregs, sizeof (fpregs)); | |
3407 | } | |
4f844a66 | 3408 | |
dba24537 AC |
3409 | return note_data; |
3410 | } | |
3411 | ||
3412 | struct linux_nat_corefile_thread_data | |
3413 | { | |
3414 | bfd *obfd; | |
3415 | char *note_data; | |
3416 | int *note_size; | |
3417 | int num_notes; | |
2020b7ab | 3418 | enum target_signal stop_signal; |
dba24537 AC |
3419 | }; |
3420 | ||
3421 | /* Called by gdbthread.c once per thread. Records the thread's | |
3422 | register state for the corefile note section. */ | |
3423 | ||
3424 | static int | |
3425 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
3426 | { | |
3427 | struct linux_nat_corefile_thread_data *args = data; | |
dba24537 | 3428 | |
dba24537 AC |
3429 | args->note_data = linux_nat_do_thread_registers (args->obfd, |
3430 | ti->ptid, | |
3431 | args->note_data, | |
2020b7ab PA |
3432 | args->note_size, |
3433 | args->stop_signal); | |
dba24537 | 3434 | args->num_notes++; |
56be3814 | 3435 | |
dba24537 AC |
3436 | return 0; |
3437 | } | |
3438 | ||
dba24537 AC |
3439 | /* Fills the "to_make_corefile_note" target vector. Builds the note |
3440 | section for a corefile, and returns it in a malloc buffer. */ | |
3441 | ||
3442 | static char * | |
3443 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
3444 | { | |
3445 | struct linux_nat_corefile_thread_data thread_args; | |
3446 | struct cleanup *old_chain; | |
d99148ef | 3447 | /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */ |
dba24537 | 3448 | char fname[16] = { '\0' }; |
d99148ef | 3449 | /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */ |
dba24537 AC |
3450 | char psargs[80] = { '\0' }; |
3451 | char *note_data = NULL; | |
3452 | ptid_t current_ptid = inferior_ptid; | |
c6826062 | 3453 | gdb_byte *auxv; |
dba24537 AC |
3454 | int auxv_len; |
3455 | ||
3456 | if (get_exec_file (0)) | |
3457 | { | |
3458 | strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname)); | |
3459 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); | |
3460 | if (get_inferior_args ()) | |
3461 | { | |
d99148ef JK |
3462 | char *string_end; |
3463 | char *psargs_end = psargs + sizeof (psargs); | |
3464 | ||
3465 | /* linux_elfcore_write_prpsinfo () handles zero unterminated | |
3466 | strings fine. */ | |
3467 | string_end = memchr (psargs, 0, sizeof (psargs)); | |
3468 | if (string_end != NULL) | |
3469 | { | |
3470 | *string_end++ = ' '; | |
3471 | strncpy (string_end, get_inferior_args (), | |
3472 | psargs_end - string_end); | |
3473 | } | |
dba24537 AC |
3474 | } |
3475 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
3476 | note_data, | |
3477 | note_size, fname, psargs); | |
3478 | } | |
3479 | ||
3480 | /* Dump information for threads. */ | |
3481 | thread_args.obfd = obfd; | |
3482 | thread_args.note_data = note_data; | |
3483 | thread_args.note_size = note_size; | |
3484 | thread_args.num_notes = 0; | |
2020b7ab | 3485 | thread_args.stop_signal = find_stop_signal (); |
dba24537 | 3486 | iterate_over_lwps (linux_nat_corefile_thread_callback, &thread_args); |
2020b7ab PA |
3487 | gdb_assert (thread_args.num_notes != 0); |
3488 | note_data = thread_args.note_data; | |
dba24537 | 3489 | |
13547ab6 DJ |
3490 | auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV, |
3491 | NULL, &auxv); | |
dba24537 AC |
3492 | if (auxv_len > 0) |
3493 | { | |
3494 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
3495 | "CORE", NT_AUXV, auxv, auxv_len); | |
3496 | xfree (auxv); | |
3497 | } | |
3498 | ||
3499 | make_cleanup (xfree, note_data); | |
3500 | return note_data; | |
3501 | } | |
3502 | ||
3503 | /* Implement the "info proc" command. */ | |
3504 | ||
3505 | static void | |
3506 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
3507 | { | |
89ecc4f5 DE |
3508 | /* A long is used for pid instead of an int to avoid a loss of precision |
3509 | compiler warning from the output of strtoul. */ | |
3510 | long pid = PIDGET (inferior_ptid); | |
dba24537 AC |
3511 | FILE *procfile; |
3512 | char **argv = NULL; | |
3513 | char buffer[MAXPATHLEN]; | |
3514 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
3515 | int cmdline_f = 1; | |
3516 | int cwd_f = 1; | |
3517 | int exe_f = 1; | |
3518 | int mappings_f = 0; | |
3519 | int environ_f = 0; | |
3520 | int status_f = 0; | |
3521 | int stat_f = 0; | |
3522 | int all = 0; | |
3523 | struct stat dummy; | |
3524 | ||
3525 | if (args) | |
3526 | { | |
3527 | /* Break up 'args' into an argv array. */ | |
d1a41061 PP |
3528 | argv = gdb_buildargv (args); |
3529 | make_cleanup_freeargv (argv); | |
dba24537 AC |
3530 | } |
3531 | while (argv != NULL && *argv != NULL) | |
3532 | { | |
3533 | if (isdigit (argv[0][0])) | |
3534 | { | |
3535 | pid = strtoul (argv[0], NULL, 10); | |
3536 | } | |
3537 | else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0) | |
3538 | { | |
3539 | mappings_f = 1; | |
3540 | } | |
3541 | else if (strcmp (argv[0], "status") == 0) | |
3542 | { | |
3543 | status_f = 1; | |
3544 | } | |
3545 | else if (strcmp (argv[0], "stat") == 0) | |
3546 | { | |
3547 | stat_f = 1; | |
3548 | } | |
3549 | else if (strcmp (argv[0], "cmd") == 0) | |
3550 | { | |
3551 | cmdline_f = 1; | |
3552 | } | |
3553 | else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0) | |
3554 | { | |
3555 | exe_f = 1; | |
3556 | } | |
3557 | else if (strcmp (argv[0], "cwd") == 0) | |
3558 | { | |
3559 | cwd_f = 1; | |
3560 | } | |
3561 | else if (strncmp (argv[0], "all", strlen (argv[0])) == 0) | |
3562 | { | |
3563 | all = 1; | |
3564 | } | |
3565 | else | |
3566 | { | |
3567 | /* [...] (future options here) */ | |
3568 | } | |
3569 | argv++; | |
3570 | } | |
3571 | if (pid == 0) | |
8a3fe4f8 | 3572 | error (_("No current process: you must name one.")); |
dba24537 | 3573 | |
89ecc4f5 | 3574 | sprintf (fname1, "/proc/%ld", pid); |
dba24537 | 3575 | if (stat (fname1, &dummy) != 0) |
8a3fe4f8 | 3576 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 3577 | |
89ecc4f5 | 3578 | printf_filtered (_("process %ld\n"), pid); |
dba24537 AC |
3579 | if (cmdline_f || all) |
3580 | { | |
89ecc4f5 | 3581 | sprintf (fname1, "/proc/%ld/cmdline", pid); |
d5d6fca5 | 3582 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 3583 | { |
7c8a8b04 | 3584 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
bf1d7d9c JB |
3585 | if (fgets (buffer, sizeof (buffer), procfile)) |
3586 | printf_filtered ("cmdline = '%s'\n", buffer); | |
3587 | else | |
3588 | warning (_("unable to read '%s'"), fname1); | |
7c8a8b04 | 3589 | do_cleanups (cleanup); |
dba24537 AC |
3590 | } |
3591 | else | |
8a3fe4f8 | 3592 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3593 | } |
3594 | if (cwd_f || all) | |
3595 | { | |
89ecc4f5 | 3596 | sprintf (fname1, "/proc/%ld/cwd", pid); |
dba24537 AC |
3597 | memset (fname2, 0, sizeof (fname2)); |
3598 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
3599 | printf_filtered ("cwd = '%s'\n", fname2); | |
3600 | else | |
8a3fe4f8 | 3601 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
3602 | } |
3603 | if (exe_f || all) | |
3604 | { | |
89ecc4f5 | 3605 | sprintf (fname1, "/proc/%ld/exe", pid); |
dba24537 AC |
3606 | memset (fname2, 0, sizeof (fname2)); |
3607 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
3608 | printf_filtered ("exe = '%s'\n", fname2); | |
3609 | else | |
8a3fe4f8 | 3610 | warning (_("unable to read link '%s'"), fname1); |
dba24537 AC |
3611 | } |
3612 | if (mappings_f || all) | |
3613 | { | |
89ecc4f5 | 3614 | sprintf (fname1, "/proc/%ld/maps", pid); |
d5d6fca5 | 3615 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
3616 | { |
3617 | long long addr, endaddr, size, offset, inode; | |
3618 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
7c8a8b04 | 3619 | struct cleanup *cleanup; |
dba24537 | 3620 | |
7c8a8b04 | 3621 | cleanup = make_cleanup_fclose (procfile); |
a3f17187 | 3622 | printf_filtered (_("Mapped address spaces:\n\n")); |
17a912b6 | 3623 | if (gdbarch_addr_bit (current_gdbarch) == 32) |
dba24537 AC |
3624 | { |
3625 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
3626 | "Start Addr", | |
3627 | " End Addr", | |
3628 | " Size", " Offset", "objfile"); | |
3629 | } | |
3630 | else | |
3631 | { | |
3632 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
3633 | "Start Addr", | |
3634 | " End Addr", | |
3635 | " Size", " Offset", "objfile"); | |
3636 | } | |
3637 | ||
3638 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
3639 | &offset, &device[0], &inode, &filename[0])) | |
3640 | { | |
3641 | size = endaddr - addr; | |
3642 | ||
3643 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
3644 | calls here (and possibly above) should be abstracted | |
3645 | out into their own functions? Andrew suggests using | |
3646 | a generic local_address_string instead to print out | |
3647 | the addresses; that makes sense to me, too. */ | |
3648 | ||
17a912b6 | 3649 | if (gdbarch_addr_bit (current_gdbarch) == 32) |
dba24537 AC |
3650 | { |
3651 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
3652 | (unsigned long) addr, /* FIXME: pr_addr */ | |
3653 | (unsigned long) endaddr, | |
3654 | (int) size, | |
3655 | (unsigned int) offset, | |
3656 | filename[0] ? filename : ""); | |
3657 | } | |
3658 | else | |
3659 | { | |
3660 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
3661 | (unsigned long) addr, /* FIXME: pr_addr */ | |
3662 | (unsigned long) endaddr, | |
3663 | (int) size, | |
3664 | (unsigned int) offset, | |
3665 | filename[0] ? filename : ""); | |
3666 | } | |
3667 | } | |
3668 | ||
7c8a8b04 | 3669 | do_cleanups (cleanup); |
dba24537 AC |
3670 | } |
3671 | else | |
8a3fe4f8 | 3672 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3673 | } |
3674 | if (status_f || all) | |
3675 | { | |
89ecc4f5 | 3676 | sprintf (fname1, "/proc/%ld/status", pid); |
d5d6fca5 | 3677 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 3678 | { |
7c8a8b04 | 3679 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
3680 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
3681 | puts_filtered (buffer); | |
7c8a8b04 | 3682 | do_cleanups (cleanup); |
dba24537 AC |
3683 | } |
3684 | else | |
8a3fe4f8 | 3685 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3686 | } |
3687 | if (stat_f || all) | |
3688 | { | |
89ecc4f5 | 3689 | sprintf (fname1, "/proc/%ld/stat", pid); |
d5d6fca5 | 3690 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
3691 | { |
3692 | int itmp; | |
3693 | char ctmp; | |
a25694b4 | 3694 | long ltmp; |
7c8a8b04 | 3695 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
3696 | |
3697 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 3698 | printf_filtered (_("Process: %d\n"), itmp); |
a25694b4 | 3699 | if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0) |
a3f17187 | 3700 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 3701 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 3702 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 3703 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3704 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 3705 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3706 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 3707 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3708 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 3709 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3710 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 3711 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 3712 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
a25694b4 AS |
3713 | if (fscanf (procfile, "%lu ", <mp) > 0) |
3714 | printf_filtered (_("Flags: 0x%lx\n"), ltmp); | |
3715 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3716 | printf_filtered (_("Minor faults (no memory page): %lu\n"), | |
3717 | (unsigned long) ltmp); | |
3718 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3719 | printf_filtered (_("Minor faults, children: %lu\n"), | |
3720 | (unsigned long) ltmp); | |
3721 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3722 | printf_filtered (_("Major faults (memory page faults): %lu\n"), | |
3723 | (unsigned long) ltmp); | |
3724 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3725 | printf_filtered (_("Major faults, children: %lu\n"), | |
3726 | (unsigned long) ltmp); | |
3727 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3728 | printf_filtered (_("utime: %ld\n"), ltmp); | |
3729 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3730 | printf_filtered (_("stime: %ld\n"), ltmp); | |
3731 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3732 | printf_filtered (_("utime, children: %ld\n"), ltmp); | |
3733 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3734 | printf_filtered (_("stime, children: %ld\n"), ltmp); | |
3735 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3736 | printf_filtered (_("jiffies remaining in current time slice: %ld\n"), | |
3737 | ltmp); | |
3738 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3739 | printf_filtered (_("'nice' value: %ld\n"), ltmp); | |
3740 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3741 | printf_filtered (_("jiffies until next timeout: %lu\n"), | |
3742 | (unsigned long) ltmp); | |
3743 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3744 | printf_filtered (_("jiffies until next SIGALRM: %lu\n"), | |
3745 | (unsigned long) ltmp); | |
3746 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3747 | printf_filtered (_("start time (jiffies since system boot): %ld\n"), | |
3748 | ltmp); | |
3749 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3750 | printf_filtered (_("Virtual memory size: %lu\n"), | |
3751 | (unsigned long) ltmp); | |
3752 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3753 | printf_filtered (_("Resident set size: %lu\n"), (unsigned long) ltmp); | |
3754 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3755 | printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp); | |
3756 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3757 | printf_filtered (_("Start of text: 0x%lx\n"), ltmp); | |
3758 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3759 | printf_filtered (_("End of text: 0x%lx\n"), ltmp); | |
3760 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3761 | printf_filtered (_("Start of stack: 0x%lx\n"), ltmp); | |
dba24537 AC |
3762 | #if 0 /* Don't know how architecture-dependent the rest is... |
3763 | Anyway the signal bitmap info is available from "status". */ | |
a25694b4 AS |
3764 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
3765 | printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp); | |
3766 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
3767 | printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp); | |
3768 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3769 | printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp); | |
3770 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3771 | printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp); | |
3772 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3773 | printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp); | |
3774 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3775 | printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp); | |
3776 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ | |
3777 | printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp); | |
dba24537 | 3778 | #endif |
7c8a8b04 | 3779 | do_cleanups (cleanup); |
dba24537 AC |
3780 | } |
3781 | else | |
8a3fe4f8 | 3782 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
3783 | } |
3784 | } | |
3785 | ||
10d6c8cd DJ |
3786 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
3787 | filesystem. Because we can use a single read() call for /proc, this | |
3788 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
3789 | but it doesn't support writes. */ | |
3790 | ||
3791 | static LONGEST | |
3792 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
3793 | const char *annex, gdb_byte *readbuf, | |
3794 | const gdb_byte *writebuf, | |
3795 | ULONGEST offset, LONGEST len) | |
dba24537 | 3796 | { |
10d6c8cd DJ |
3797 | LONGEST ret; |
3798 | int fd; | |
dba24537 AC |
3799 | char filename[64]; |
3800 | ||
10d6c8cd | 3801 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
3802 | return 0; |
3803 | ||
3804 | /* Don't bother for one word. */ | |
3805 | if (len < 3 * sizeof (long)) | |
3806 | return 0; | |
3807 | ||
3808 | /* We could keep this file open and cache it - possibly one per | |
3809 | thread. That requires some juggling, but is even faster. */ | |
3810 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
3811 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
3812 | if (fd == -1) | |
3813 | return 0; | |
3814 | ||
3815 | /* If pread64 is available, use it. It's faster if the kernel | |
3816 | supports it (only one syscall), and it's 64-bit safe even on | |
3817 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
3818 | application). */ | |
3819 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 3820 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 3821 | #else |
10d6c8cd | 3822 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
3823 | #endif |
3824 | ret = 0; | |
3825 | else | |
3826 | ret = len; | |
3827 | ||
3828 | close (fd); | |
3829 | return ret; | |
3830 | } | |
3831 | ||
3832 | /* Parse LINE as a signal set and add its set bits to SIGS. */ | |
3833 | ||
3834 | static void | |
3835 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
3836 | { | |
3837 | int len = strlen (line) - 1; | |
3838 | const char *p; | |
3839 | int signum; | |
3840 | ||
3841 | if (line[len] != '\n') | |
8a3fe4f8 | 3842 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
3843 | |
3844 | p = line; | |
3845 | signum = len * 4; | |
3846 | while (len-- > 0) | |
3847 | { | |
3848 | int digit; | |
3849 | ||
3850 | if (*p >= '0' && *p <= '9') | |
3851 | digit = *p - '0'; | |
3852 | else if (*p >= 'a' && *p <= 'f') | |
3853 | digit = *p - 'a' + 10; | |
3854 | else | |
8a3fe4f8 | 3855 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
3856 | |
3857 | signum -= 4; | |
3858 | ||
3859 | if (digit & 1) | |
3860 | sigaddset (sigs, signum + 1); | |
3861 | if (digit & 2) | |
3862 | sigaddset (sigs, signum + 2); | |
3863 | if (digit & 4) | |
3864 | sigaddset (sigs, signum + 3); | |
3865 | if (digit & 8) | |
3866 | sigaddset (sigs, signum + 4); | |
3867 | ||
3868 | p++; | |
3869 | } | |
3870 | } | |
3871 | ||
3872 | /* Find process PID's pending signals from /proc/pid/status and set | |
3873 | SIGS to match. */ | |
3874 | ||
3875 | void | |
3876 | linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored) | |
3877 | { | |
3878 | FILE *procfile; | |
3879 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
3880 | int signum; | |
7c8a8b04 | 3881 | struct cleanup *cleanup; |
dba24537 AC |
3882 | |
3883 | sigemptyset (pending); | |
3884 | sigemptyset (blocked); | |
3885 | sigemptyset (ignored); | |
3886 | sprintf (fname, "/proc/%d/status", pid); | |
3887 | procfile = fopen (fname, "r"); | |
3888 | if (procfile == NULL) | |
8a3fe4f8 | 3889 | error (_("Could not open %s"), fname); |
7c8a8b04 | 3890 | cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
3891 | |
3892 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
3893 | { | |
3894 | /* Normal queued signals are on the SigPnd line in the status | |
3895 | file. However, 2.6 kernels also have a "shared" pending | |
3896 | queue for delivering signals to a thread group, so check for | |
3897 | a ShdPnd line also. | |
3898 | ||
3899 | Unfortunately some Red Hat kernels include the shared pending | |
3900 | queue but not the ShdPnd status field. */ | |
3901 | ||
3902 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
3903 | add_line_to_sigset (buffer + 8, pending); | |
3904 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
3905 | add_line_to_sigset (buffer + 8, pending); | |
3906 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
3907 | add_line_to_sigset (buffer + 8, blocked); | |
3908 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
3909 | add_line_to_sigset (buffer + 8, ignored); | |
3910 | } | |
3911 | ||
7c8a8b04 | 3912 | do_cleanups (cleanup); |
dba24537 AC |
3913 | } |
3914 | ||
07e059b5 VP |
3915 | static LONGEST |
3916 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, | |
3917 | const char *annex, gdb_byte *readbuf, | |
3918 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
3919 | { | |
3920 | /* We make the process list snapshot when the object starts to be | |
3921 | read. */ | |
3922 | static const char *buf; | |
3923 | static LONGEST len_avail = -1; | |
3924 | static struct obstack obstack; | |
3925 | ||
3926 | DIR *dirp; | |
3927 | ||
3928 | gdb_assert (object == TARGET_OBJECT_OSDATA); | |
3929 | ||
3930 | if (strcmp (annex, "processes") != 0) | |
3931 | return 0; | |
3932 | ||
3933 | gdb_assert (readbuf && !writebuf); | |
3934 | ||
3935 | if (offset == 0) | |
3936 | { | |
3937 | if (len_avail != -1 && len_avail != 0) | |
3938 | obstack_free (&obstack, NULL); | |
3939 | len_avail = 0; | |
3940 | buf = NULL; | |
3941 | obstack_init (&obstack); | |
3942 | obstack_grow_str (&obstack, "<osdata type=\"processes\">\n"); | |
3943 | ||
3944 | dirp = opendir ("/proc"); | |
3945 | if (dirp) | |
3946 | { | |
3947 | struct dirent *dp; | |
3948 | while ((dp = readdir (dirp)) != NULL) | |
3949 | { | |
3950 | struct stat statbuf; | |
3951 | char procentry[sizeof ("/proc/4294967295")]; | |
3952 | ||
3953 | if (!isdigit (dp->d_name[0]) | |
1a6d2f2f | 3954 | || NAMELEN (dp) > sizeof ("4294967295") - 1) |
07e059b5 VP |
3955 | continue; |
3956 | ||
3957 | sprintf (procentry, "/proc/%s", dp->d_name); | |
3958 | if (stat (procentry, &statbuf) == 0 | |
3959 | && S_ISDIR (statbuf.st_mode)) | |
3960 | { | |
3961 | char *pathname; | |
3962 | FILE *f; | |
3963 | char cmd[MAXPATHLEN + 1]; | |
3964 | struct passwd *entry; | |
3965 | ||
3966 | pathname = xstrprintf ("/proc/%s/cmdline", dp->d_name); | |
3967 | entry = getpwuid (statbuf.st_uid); | |
3968 | ||
3969 | if ((f = fopen (pathname, "r")) != NULL) | |
3970 | { | |
3971 | size_t len = fread (cmd, 1, sizeof (cmd) - 1, f); | |
3972 | if (len > 0) | |
3973 | { | |
3974 | int i; | |
3975 | for (i = 0; i < len; i++) | |
3976 | if (cmd[i] == '\0') | |
3977 | cmd[i] = ' '; | |
3978 | cmd[len] = '\0'; | |
3979 | ||
3980 | obstack_xml_printf ( | |
3981 | &obstack, | |
3982 | "<item>" | |
3983 | "<column name=\"pid\">%s</column>" | |
3984 | "<column name=\"user\">%s</column>" | |
3985 | "<column name=\"command\">%s</column>" | |
3986 | "</item>", | |
3987 | dp->d_name, | |
3988 | entry ? entry->pw_name : "?", | |
3989 | cmd); | |
3990 | } | |
3991 | fclose (f); | |
3992 | } | |
3993 | ||
3994 | xfree (pathname); | |
3995 | } | |
3996 | } | |
3997 | ||
3998 | closedir (dirp); | |
3999 | } | |
4000 | ||
4001 | obstack_grow_str0 (&obstack, "</osdata>\n"); | |
4002 | buf = obstack_finish (&obstack); | |
4003 | len_avail = strlen (buf); | |
4004 | } | |
4005 | ||
4006 | if (offset >= len_avail) | |
4007 | { | |
4008 | /* Done. Get rid of the obstack. */ | |
4009 | obstack_free (&obstack, NULL); | |
4010 | buf = NULL; | |
4011 | len_avail = 0; | |
4012 | return 0; | |
4013 | } | |
4014 | ||
4015 | if (len > len_avail - offset) | |
4016 | len = len_avail - offset; | |
4017 | memcpy (readbuf, buf + offset, len); | |
4018 | ||
4019 | return len; | |
4020 | } | |
4021 | ||
10d6c8cd DJ |
4022 | static LONGEST |
4023 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
4024 | const char *annex, gdb_byte *readbuf, | |
4025 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4026 | { | |
4027 | LONGEST xfer; | |
4028 | ||
4029 | if (object == TARGET_OBJECT_AUXV) | |
4030 | return procfs_xfer_auxv (ops, object, annex, readbuf, writebuf, | |
4031 | offset, len); | |
4032 | ||
07e059b5 VP |
4033 | if (object == TARGET_OBJECT_OSDATA) |
4034 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
4035 | offset, len); | |
4036 | ||
10d6c8cd DJ |
4037 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
4038 | offset, len); | |
4039 | if (xfer != 0) | |
4040 | return xfer; | |
4041 | ||
4042 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
4043 | offset, len); | |
4044 | } | |
4045 | ||
e9efe249 | 4046 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
4047 | it with local methods. */ |
4048 | ||
910122bf UW |
4049 | static void |
4050 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 4051 | { |
6d8fd2b7 UW |
4052 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
4053 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; | |
4054 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; | |
4055 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; | |
10d6c8cd | 4056 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
4057 | t->to_post_attach = linux_child_post_attach; |
4058 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
4059 | t->to_find_memory_regions = linux_nat_find_memory_regions; |
4060 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
4061 | ||
4062 | super_xfer_partial = t->to_xfer_partial; | |
4063 | t->to_xfer_partial = linux_xfer_partial; | |
910122bf UW |
4064 | } |
4065 | ||
4066 | struct target_ops * | |
4067 | linux_target (void) | |
4068 | { | |
4069 | struct target_ops *t; | |
4070 | ||
4071 | t = inf_ptrace_target (); | |
4072 | linux_target_install_ops (t); | |
4073 | ||
4074 | return t; | |
4075 | } | |
4076 | ||
4077 | struct target_ops * | |
7714d83a | 4078 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
4079 | { |
4080 | struct target_ops *t; | |
4081 | ||
4082 | t = inf_ptrace_trad_target (register_u_offset); | |
4083 | linux_target_install_ops (t); | |
10d6c8cd | 4084 | |
10d6c8cd DJ |
4085 | return t; |
4086 | } | |
4087 | ||
b84876c2 PA |
4088 | /* target_is_async_p implementation. */ |
4089 | ||
4090 | static int | |
4091 | linux_nat_is_async_p (void) | |
4092 | { | |
4093 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 4094 | it explicitly with the "set target-async" command. |
b84876c2 | 4095 | Someday, linux will always be async. */ |
c6ebd6cf | 4096 | if (!target_async_permitted) |
b84876c2 PA |
4097 | return 0; |
4098 | ||
4099 | return 1; | |
4100 | } | |
4101 | ||
4102 | /* target_can_async_p implementation. */ | |
4103 | ||
4104 | static int | |
4105 | linux_nat_can_async_p (void) | |
4106 | { | |
4107 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 4108 | it explicitly with the "set target-async" command. |
b84876c2 | 4109 | Someday, linux will always be async. */ |
c6ebd6cf | 4110 | if (!target_async_permitted) |
b84876c2 PA |
4111 | return 0; |
4112 | ||
4113 | /* See target.h/target_async_mask. */ | |
4114 | return linux_nat_async_mask_value; | |
4115 | } | |
4116 | ||
9908b566 VP |
4117 | static int |
4118 | linux_nat_supports_non_stop (void) | |
4119 | { | |
4120 | return 1; | |
4121 | } | |
4122 | ||
b84876c2 PA |
4123 | /* target_async_mask implementation. */ |
4124 | ||
4125 | static int | |
7feb7d06 | 4126 | linux_nat_async_mask (int new_mask) |
b84876c2 | 4127 | { |
7feb7d06 | 4128 | int curr_mask = linux_nat_async_mask_value; |
b84876c2 | 4129 | |
7feb7d06 | 4130 | if (curr_mask != new_mask) |
b84876c2 | 4131 | { |
7feb7d06 | 4132 | if (new_mask == 0) |
b84876c2 PA |
4133 | { |
4134 | linux_nat_async (NULL, 0); | |
7feb7d06 | 4135 | linux_nat_async_mask_value = new_mask; |
b84876c2 PA |
4136 | } |
4137 | else | |
4138 | { | |
7feb7d06 | 4139 | linux_nat_async_mask_value = new_mask; |
84e46146 | 4140 | |
7feb7d06 PA |
4141 | /* If we're going out of async-mask in all-stop, then the |
4142 | inferior is stopped. The next resume will call | |
4143 | target_async. In non-stop, the target event source | |
4144 | should be always registered in the event loop. Do so | |
4145 | now. */ | |
4146 | if (non_stop) | |
4147 | linux_nat_async (inferior_event_handler, 0); | |
b84876c2 PA |
4148 | } |
4149 | } | |
4150 | ||
7feb7d06 | 4151 | return curr_mask; |
b84876c2 PA |
4152 | } |
4153 | ||
4154 | static int async_terminal_is_ours = 1; | |
4155 | ||
4156 | /* target_terminal_inferior implementation. */ | |
4157 | ||
4158 | static void | |
4159 | linux_nat_terminal_inferior (void) | |
4160 | { | |
4161 | if (!target_is_async_p ()) | |
4162 | { | |
4163 | /* Async mode is disabled. */ | |
4164 | terminal_inferior (); | |
4165 | return; | |
4166 | } | |
4167 | ||
4168 | /* GDB should never give the terminal to the inferior, if the | |
4169 | inferior is running in the background (run&, continue&, etc.). | |
4170 | This check can be removed when the common code is fixed. */ | |
4171 | if (!sync_execution) | |
4172 | return; | |
4173 | ||
4174 | terminal_inferior (); | |
4175 | ||
4176 | if (!async_terminal_is_ours) | |
4177 | return; | |
4178 | ||
4179 | delete_file_handler (input_fd); | |
4180 | async_terminal_is_ours = 0; | |
4181 | set_sigint_trap (); | |
4182 | } | |
4183 | ||
4184 | /* target_terminal_ours implementation. */ | |
4185 | ||
2c0b251b | 4186 | static void |
b84876c2 PA |
4187 | linux_nat_terminal_ours (void) |
4188 | { | |
4189 | if (!target_is_async_p ()) | |
4190 | { | |
4191 | /* Async mode is disabled. */ | |
4192 | terminal_ours (); | |
4193 | return; | |
4194 | } | |
4195 | ||
4196 | /* GDB should never give the terminal to the inferior if the | |
4197 | inferior is running in the background (run&, continue&, etc.), | |
4198 | but claiming it sure should. */ | |
4199 | terminal_ours (); | |
4200 | ||
4201 | if (!sync_execution) | |
4202 | return; | |
4203 | ||
4204 | if (async_terminal_is_ours) | |
4205 | return; | |
4206 | ||
4207 | clear_sigint_trap (); | |
4208 | add_file_handler (input_fd, stdin_event_handler, 0); | |
4209 | async_terminal_is_ours = 1; | |
4210 | } | |
4211 | ||
4212 | static void (*async_client_callback) (enum inferior_event_type event_type, | |
4213 | void *context); | |
4214 | static void *async_client_context; | |
4215 | ||
7feb7d06 PA |
4216 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
4217 | so we notice when any child changes state, and notify the | |
4218 | event-loop; it allows us to use sigsuspend in linux_nat_wait_1 | |
4219 | above to wait for the arrival of a SIGCHLD. */ | |
4220 | ||
b84876c2 | 4221 | static void |
7feb7d06 | 4222 | sigchld_handler (int signo) |
b84876c2 | 4223 | { |
7feb7d06 PA |
4224 | int old_errno = errno; |
4225 | ||
4226 | if (debug_linux_nat_async) | |
4227 | fprintf_unfiltered (gdb_stdlog, "sigchld\n"); | |
4228 | ||
4229 | if (signo == SIGCHLD | |
4230 | && linux_nat_event_pipe[0] != -1) | |
4231 | async_file_mark (); /* Let the event loop know that there are | |
4232 | events to handle. */ | |
4233 | ||
4234 | errno = old_errno; | |
4235 | } | |
4236 | ||
4237 | /* Callback registered with the target events file descriptor. */ | |
4238 | ||
4239 | static void | |
4240 | handle_target_event (int error, gdb_client_data client_data) | |
4241 | { | |
4242 | (*async_client_callback) (INF_REG_EVENT, async_client_context); | |
4243 | } | |
4244 | ||
4245 | /* Create/destroy the target events pipe. Returns previous state. */ | |
4246 | ||
4247 | static int | |
4248 | linux_async_pipe (int enable) | |
4249 | { | |
4250 | int previous = (linux_nat_event_pipe[0] != -1); | |
4251 | ||
4252 | if (previous != enable) | |
4253 | { | |
4254 | sigset_t prev_mask; | |
4255 | ||
4256 | block_child_signals (&prev_mask); | |
4257 | ||
4258 | if (enable) | |
4259 | { | |
4260 | if (pipe (linux_nat_event_pipe) == -1) | |
4261 | internal_error (__FILE__, __LINE__, | |
4262 | "creating event pipe failed."); | |
4263 | ||
4264 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
4265 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
4266 | } | |
4267 | else | |
4268 | { | |
4269 | close (linux_nat_event_pipe[0]); | |
4270 | close (linux_nat_event_pipe[1]); | |
4271 | linux_nat_event_pipe[0] = -1; | |
4272 | linux_nat_event_pipe[1] = -1; | |
4273 | } | |
4274 | ||
4275 | restore_child_signals_mask (&prev_mask); | |
4276 | } | |
4277 | ||
4278 | return previous; | |
b84876c2 PA |
4279 | } |
4280 | ||
4281 | /* target_async implementation. */ | |
4282 | ||
4283 | static void | |
4284 | linux_nat_async (void (*callback) (enum inferior_event_type event_type, | |
4285 | void *context), void *context) | |
4286 | { | |
c6ebd6cf | 4287 | if (linux_nat_async_mask_value == 0 || !target_async_permitted) |
b84876c2 PA |
4288 | internal_error (__FILE__, __LINE__, |
4289 | "Calling target_async when async is masked"); | |
4290 | ||
4291 | if (callback != NULL) | |
4292 | { | |
4293 | async_client_callback = callback; | |
4294 | async_client_context = context; | |
7feb7d06 PA |
4295 | if (!linux_async_pipe (1)) |
4296 | { | |
4297 | add_file_handler (linux_nat_event_pipe[0], | |
4298 | handle_target_event, NULL); | |
4299 | /* There may be pending events to handle. Tell the event loop | |
4300 | to poll them. */ | |
4301 | async_file_mark (); | |
4302 | } | |
b84876c2 PA |
4303 | } |
4304 | else | |
4305 | { | |
4306 | async_client_callback = callback; | |
4307 | async_client_context = context; | |
b84876c2 | 4308 | delete_file_handler (linux_nat_event_pipe[0]); |
7feb7d06 | 4309 | linux_async_pipe (0); |
b84876c2 PA |
4310 | } |
4311 | return; | |
4312 | } | |
4313 | ||
252fbfc8 PA |
4314 | /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other |
4315 | event came out. */ | |
4316 | ||
4c28f408 | 4317 | static int |
252fbfc8 | 4318 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 4319 | { |
252fbfc8 PA |
4320 | ptid_t ptid = * (ptid_t *) data; |
4321 | ||
4322 | if (ptid_equal (lwp->ptid, ptid) | |
4323 | || ptid_equal (minus_one_ptid, ptid) | |
4324 | || (ptid_is_pid (ptid) | |
4325 | && ptid_get_pid (ptid) == ptid_get_pid (lwp->ptid))) | |
4326 | { | |
4327 | if (!lwp->stopped) | |
4328 | { | |
4329 | int pid, status; | |
7feb7d06 | 4330 | ptid_t ptid = lwp->ptid; |
252fbfc8 PA |
4331 | |
4332 | if (debug_linux_nat) | |
4333 | fprintf_unfiltered (gdb_stdlog, | |
4334 | "LNSL: running -> suspending %s\n", | |
4335 | target_pid_to_str (lwp->ptid)); | |
4336 | ||
252fbfc8 | 4337 | |
7feb7d06 PA |
4338 | stop_callback (lwp, NULL); |
4339 | stop_wait_callback (lwp, NULL); | |
252fbfc8 | 4340 | |
7feb7d06 PA |
4341 | /* If the lwp exits while we try to stop it, there's nothing |
4342 | else to do. */ | |
4343 | lwp = find_lwp_pid (ptid); | |
4344 | if (lwp == NULL) | |
4345 | return 0; | |
252fbfc8 PA |
4346 | |
4347 | /* If we didn't collect any signal other than SIGSTOP while | |
4348 | stopping the LWP, push a SIGNAL_0 event. In either case, | |
4349 | the event-loop will end up calling target_wait which will | |
4350 | collect these. */ | |
7feb7d06 PA |
4351 | if (lwp->status == 0) |
4352 | lwp->status = W_STOPCODE (0); | |
4353 | async_file_mark (); | |
252fbfc8 PA |
4354 | } |
4355 | else | |
4356 | { | |
4357 | /* Already known to be stopped; do nothing. */ | |
4358 | ||
4359 | if (debug_linux_nat) | |
4360 | { | |
4361 | if (find_thread_pid (lwp->ptid)->stop_requested) | |
4362 | fprintf_unfiltered (gdb_stdlog, "\ | |
4363 | LNSL: already stopped/stop_requested %s\n", | |
4364 | target_pid_to_str (lwp->ptid)); | |
4365 | else | |
4366 | fprintf_unfiltered (gdb_stdlog, "\ | |
4367 | LNSL: already stopped/no stop_requested yet %s\n", | |
4368 | target_pid_to_str (lwp->ptid)); | |
4369 | } | |
4370 | } | |
4371 | } | |
4c28f408 PA |
4372 | return 0; |
4373 | } | |
4374 | ||
4375 | static void | |
4376 | linux_nat_stop (ptid_t ptid) | |
4377 | { | |
4378 | if (non_stop) | |
7feb7d06 | 4379 | iterate_over_lwps (linux_nat_stop_lwp, &ptid); |
4c28f408 PA |
4380 | else |
4381 | linux_ops->to_stop (ptid); | |
4382 | } | |
4383 | ||
f973ed9c DJ |
4384 | void |
4385 | linux_nat_add_target (struct target_ops *t) | |
4386 | { | |
f973ed9c DJ |
4387 | /* Save the provided single-threaded target. We save this in a separate |
4388 | variable because another target we've inherited from (e.g. inf-ptrace) | |
4389 | may have saved a pointer to T; we want to use it for the final | |
4390 | process stratum target. */ | |
4391 | linux_ops_saved = *t; | |
4392 | linux_ops = &linux_ops_saved; | |
4393 | ||
4394 | /* Override some methods for multithreading. */ | |
b84876c2 | 4395 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
4396 | t->to_attach = linux_nat_attach; |
4397 | t->to_detach = linux_nat_detach; | |
4398 | t->to_resume = linux_nat_resume; | |
4399 | t->to_wait = linux_nat_wait; | |
4400 | t->to_xfer_partial = linux_nat_xfer_partial; | |
4401 | t->to_kill = linux_nat_kill; | |
4402 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
4403 | t->to_thread_alive = linux_nat_thread_alive; | |
4404 | t->to_pid_to_str = linux_nat_pid_to_str; | |
4405 | t->to_has_thread_control = tc_schedlock; | |
4406 | ||
b84876c2 PA |
4407 | t->to_can_async_p = linux_nat_can_async_p; |
4408 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 4409 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
b84876c2 PA |
4410 | t->to_async = linux_nat_async; |
4411 | t->to_async_mask = linux_nat_async_mask; | |
4412 | t->to_terminal_inferior = linux_nat_terminal_inferior; | |
4413 | t->to_terminal_ours = linux_nat_terminal_ours; | |
4414 | ||
4c28f408 PA |
4415 | /* Methods for non-stop support. */ |
4416 | t->to_stop = linux_nat_stop; | |
4417 | ||
f973ed9c DJ |
4418 | /* We don't change the stratum; this target will sit at |
4419 | process_stratum and thread_db will set at thread_stratum. This | |
4420 | is a little strange, since this is a multi-threaded-capable | |
4421 | target, but we want to be on the stack below thread_db, and we | |
4422 | also want to be used for single-threaded processes. */ | |
4423 | ||
4424 | add_target (t); | |
f973ed9c DJ |
4425 | } |
4426 | ||
9f0bdab8 DJ |
4427 | /* Register a method to call whenever a new thread is attached. */ |
4428 | void | |
4429 | linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t)) | |
4430 | { | |
4431 | /* Save the pointer. We only support a single registered instance | |
4432 | of the GNU/Linux native target, so we do not need to map this to | |
4433 | T. */ | |
4434 | linux_nat_new_thread = new_thread; | |
4435 | } | |
4436 | ||
5b009018 PA |
4437 | /* Register a method that converts a siginfo object between the layout |
4438 | that ptrace returns, and the layout in the architecture of the | |
4439 | inferior. */ | |
4440 | void | |
4441 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
4442 | int (*siginfo_fixup) (struct siginfo *, | |
4443 | gdb_byte *, | |
4444 | int)) | |
4445 | { | |
4446 | /* Save the pointer. */ | |
4447 | linux_nat_siginfo_fixup = siginfo_fixup; | |
4448 | } | |
4449 | ||
9f0bdab8 DJ |
4450 | /* Return the saved siginfo associated with PTID. */ |
4451 | struct siginfo * | |
4452 | linux_nat_get_siginfo (ptid_t ptid) | |
4453 | { | |
4454 | struct lwp_info *lp = find_lwp_pid (ptid); | |
4455 | ||
4456 | gdb_assert (lp != NULL); | |
4457 | ||
4458 | return &lp->siginfo; | |
4459 | } | |
4460 | ||
2c0b251b PA |
4461 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
4462 | extern initialize_file_ftype _initialize_linux_nat; | |
4463 | ||
d6b0e80f AC |
4464 | void |
4465 | _initialize_linux_nat (void) | |
4466 | { | |
b84876c2 | 4467 | sigset_t mask; |
dba24537 | 4468 | |
1bedd215 AC |
4469 | add_info ("proc", linux_nat_info_proc_cmd, _("\ |
4470 | Show /proc process information about any running process.\n\ | |
dba24537 AC |
4471 | Specify any process id, or use the program being debugged by default.\n\ |
4472 | Specify any of the following keywords for detailed info:\n\ | |
4473 | mappings -- list of mapped memory regions.\n\ | |
4474 | stat -- list a bunch of random process info.\n\ | |
4475 | status -- list a different bunch of random process info.\n\ | |
1bedd215 | 4476 | all -- list all available /proc info.")); |
d6b0e80f | 4477 | |
b84876c2 PA |
4478 | add_setshow_zinteger_cmd ("lin-lwp", class_maintenance, |
4479 | &debug_linux_nat, _("\ | |
4480 | Set debugging of GNU/Linux lwp module."), _("\ | |
4481 | Show debugging of GNU/Linux lwp module."), _("\ | |
4482 | Enables printf debugging output."), | |
4483 | NULL, | |
4484 | show_debug_linux_nat, | |
4485 | &setdebuglist, &showdebuglist); | |
4486 | ||
4487 | add_setshow_zinteger_cmd ("lin-lwp-async", class_maintenance, | |
4488 | &debug_linux_nat_async, _("\ | |
4489 | Set debugging of GNU/Linux async lwp module."), _("\ | |
4490 | Show debugging of GNU/Linux async lwp module."), _("\ | |
4491 | Enables printf debugging output."), | |
4492 | NULL, | |
4493 | show_debug_linux_nat_async, | |
4494 | &setdebuglist, &showdebuglist); | |
4495 | ||
b84876c2 | 4496 | /* Save this mask as the default. */ |
d6b0e80f AC |
4497 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
4498 | ||
7feb7d06 PA |
4499 | /* Install a SIGCHLD handler. */ |
4500 | sigchld_action.sa_handler = sigchld_handler; | |
4501 | sigemptyset (&sigchld_action.sa_mask); | |
4502 | sigchld_action.sa_flags = SA_RESTART; | |
b84876c2 PA |
4503 | |
4504 | /* Make it the default. */ | |
7feb7d06 | 4505 | sigaction (SIGCHLD, &sigchld_action, NULL); |
d6b0e80f AC |
4506 | |
4507 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
4508 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
4509 | sigdelset (&suspend_mask, SIGCHLD); | |
4510 | ||
7feb7d06 | 4511 | sigemptyset (&blocked_mask); |
10568435 JK |
4512 | |
4513 | add_setshow_boolean_cmd ("disable-randomization", class_support, | |
4514 | &disable_randomization, _("\ | |
4515 | Set disabling of debuggee's virtual address space randomization."), _("\ | |
4516 | Show disabling of debuggee's virtual address space randomization."), _("\ | |
4517 | When this mode is on (which is the default), randomization of the virtual\n\ | |
4518 | address space is disabled. Standalone programs run with the randomization\n\ | |
4519 | enabled by default on some platforms."), | |
4520 | &set_disable_randomization, | |
4521 | &show_disable_randomization, | |
4522 | &setlist, &showlist); | |
d6b0e80f AC |
4523 | } |
4524 | \f | |
4525 | ||
4526 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
4527 | the GNU/Linux Threads library and therefore doesn't really belong | |
4528 | here. */ | |
4529 | ||
4530 | /* Read variable NAME in the target and return its value if found. | |
4531 | Otherwise return zero. It is assumed that the type of the variable | |
4532 | is `int'. */ | |
4533 | ||
4534 | static int | |
4535 | get_signo (const char *name) | |
4536 | { | |
4537 | struct minimal_symbol *ms; | |
4538 | int signo; | |
4539 | ||
4540 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
4541 | if (ms == NULL) | |
4542 | return 0; | |
4543 | ||
8e70166d | 4544 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
4545 | sizeof (signo)) != 0) |
4546 | return 0; | |
4547 | ||
4548 | return signo; | |
4549 | } | |
4550 | ||
4551 | /* Return the set of signals used by the threads library in *SET. */ | |
4552 | ||
4553 | void | |
4554 | lin_thread_get_thread_signals (sigset_t *set) | |
4555 | { | |
4556 | struct sigaction action; | |
4557 | int restart, cancel; | |
4558 | ||
b84876c2 | 4559 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
4560 | sigemptyset (set); |
4561 | ||
4562 | restart = get_signo ("__pthread_sig_restart"); | |
17fbb0bd DJ |
4563 | cancel = get_signo ("__pthread_sig_cancel"); |
4564 | ||
4565 | /* LinuxThreads normally uses the first two RT signals, but in some legacy | |
4566 | cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does | |
4567 | not provide any way for the debugger to query the signal numbers - | |
4568 | fortunately they don't change! */ | |
4569 | ||
d6b0e80f | 4570 | if (restart == 0) |
17fbb0bd | 4571 | restart = __SIGRTMIN; |
d6b0e80f | 4572 | |
d6b0e80f | 4573 | if (cancel == 0) |
17fbb0bd | 4574 | cancel = __SIGRTMIN + 1; |
d6b0e80f AC |
4575 | |
4576 | sigaddset (set, restart); | |
4577 | sigaddset (set, cancel); | |
4578 | ||
4579 | /* The GNU/Linux Threads library makes terminating threads send a | |
4580 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
4581 | those (to prevent them from terminating GDB itself, which is | |
4582 | likely to be their default action) and treat them the same way as | |
4583 | SIGCHLD. */ | |
4584 | ||
4585 | action.sa_handler = sigchld_handler; | |
4586 | sigemptyset (&action.sa_mask); | |
58aecb61 | 4587 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
4588 | sigaction (cancel, &action, NULL); |
4589 | ||
4590 | /* We block the "cancel" signal throughout this code ... */ | |
4591 | sigaddset (&blocked_mask, cancel); | |
4592 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
4593 | ||
4594 | /* ... except during a sigsuspend. */ | |
4595 | sigdelset (&suspend_mask, cancel); | |
4596 | } |