Commit | Line | Data |
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c906108c | 1 | /* Fork a Unix child process, and set up to debug it, for GDB. |
74a4fe32 | 2 | |
61baf725 | 3 | Copyright (C) 1990-2017 Free Software Foundation, Inc. |
74a4fe32 | 4 | |
c906108c SS |
5 | Contributed by Cygnus Support. |
6 | ||
c5aa993b | 7 | This file is part of GDB. |
c906108c | 8 | |
c5aa993b JM |
9 | This program is free software; you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 12 | (at your option) any later version. |
c906108c | 13 | |
c5aa993b JM |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
c906108c | 18 | |
c5aa993b | 19 | You should have received a copy of the GNU General Public License |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
21 | |
22 | #include "defs.h" | |
c906108c | 23 | #include "inferior.h" |
191c4426 | 24 | #include "terminal.h" |
c906108c | 25 | #include "target.h" |
03f2053f | 26 | #include "gdb_wait.h" |
74c1b268 | 27 | #include "gdb_vfork.h" |
c906108c | 28 | #include "gdbcore.h" |
c906108c | 29 | #include "gdbthread.h" |
c2d11a7d | 30 | #include "command.h" /* for dont_repeat () */ |
ccd213ac | 31 | #include "gdbcmd.h" |
a77053c2 | 32 | #include "solib.h" |
614c279d | 33 | #include "filestuff.h" |
49940788 | 34 | #include "top.h" |
f348d89a | 35 | #include "signals-state-save-restore.h" |
15652511 | 36 | #include "job-control.h" |
c906108c | 37 | #include <signal.h> |
7c5ded6a | 38 | #include <vector> |
c906108c | 39 | |
74a4fe32 | 40 | /* This just gets used as a default if we can't find SHELL. */ |
c906108c | 41 | #define SHELL_FILE "/bin/sh" |
c906108c SS |
42 | |
43 | extern char **environ; | |
44 | ||
ccd213ac DJ |
45 | static char *exec_wrapper; |
46 | ||
808480f6 | 47 | /* Build the argument vector for execv(3). */ |
74a4fe32 | 48 | |
808480f6 | 49 | class execv_argv |
c906108c | 50 | { |
808480f6 PA |
51 | public: |
52 | /* EXEC_FILE is the file to run. ALLARGS is a string containing the | |
53 | arguments to the program. If starting with a shell, SHELL_FILE | |
54 | is the shell to run. Otherwise, SHELL_FILE is NULL. */ | |
55 | execv_argv (const char *exec_file, const std::string &allargs, | |
56 | const char *shell_file); | |
57 | ||
58 | /* Return a pointer to the built argv, in the type expected by | |
59 | execv. The result is (only) valid for as long as this execv_argv | |
60 | object is live. We return a "char **" because that's the type | |
61 | that the execv functions expect. Note that it is guaranteed that | |
62 | the execv functions do not modify the argv[] array nor the | |
63 | strings to which the array point. */ | |
64 | char **argv () | |
65 | { | |
66 | return const_cast<char **> (&m_argv[0]); | |
67 | } | |
68 | ||
69 | private: | |
70 | /* Disable copying. */ | |
71 | execv_argv (const execv_argv &) = delete; | |
72 | void operator= (const execv_argv &) = delete; | |
73 | ||
74 | /* Helper methods for constructing the argument vector. */ | |
75 | ||
76 | /* Used when building an argv for a straight execv call, without | |
77 | going via the shell. */ | |
78 | void init_for_no_shell (const char *exec_file, | |
79 | const std::string &allargs); | |
80 | ||
81 | /* Used when building an argv for execing a shell that execs the | |
82 | child program. */ | |
83 | void init_for_shell (const char *exec_file, | |
84 | const std::string &allargs, | |
85 | const char *shell_file); | |
86 | ||
87 | /* The argument vector built. Holds non-owning pointers. Elements | |
88 | either point to the strings passed to the execv_argv ctor, or | |
89 | inside M_STORAGE. */ | |
90 | std::vector<const char *> m_argv; | |
91 | ||
92 | /* Storage. In the no-shell case, this contains a copy of the | |
93 | arguments passed to the ctor, split by '\0'. In the shell case, | |
94 | this contains the quoted shell command. I.e., SHELL_COMMAND in | |
95 | {"$SHELL" "-c", SHELL_COMMAND, NULL}. */ | |
96 | std::string m_storage; | |
97 | }; | |
98 | ||
99 | /* Create argument vector for straight call to execvp. Breaks up | |
100 | ALLARGS into an argument vector suitable for passing to execvp and | |
101 | stores it in M_ARGV. E.g., on "run a b c d" this routine would get | |
102 | as input the string "a b c d", and as output it would fill in | |
103 | M_ARGV with the four arguments "a", "b", "c", "d". Each argument | |
104 | in M_ARGV points to a substring of a copy of ALLARGS stored in | |
105 | M_STORAGE. */ | |
106 | ||
107 | void | |
108 | execv_argv::init_for_no_shell (const char *exec_file, | |
109 | const std::string &allargs) | |
110 | { | |
111 | ||
112 | /* Save/work with a copy stored in our storage. The pointers pushed | |
113 | to M_ARGV point directly into M_STORAGE, which is modified in | |
114 | place with the necessary NULL terminators. This avoids N heap | |
115 | allocations and string dups when 1 is sufficient. */ | |
116 | std::string &args_copy = m_storage = allargs; | |
117 | ||
118 | m_argv.push_back (exec_file); | |
119 | ||
120 | for (size_t cur_pos = 0; cur_pos < args_copy.size ();) | |
c906108c | 121 | { |
7c5ded6a | 122 | /* Skip whitespace-like chars. */ |
808480f6 | 123 | std::size_t pos = args_copy.find_first_not_of (" \t\n", cur_pos); |
7c5ded6a SDJ |
124 | |
125 | if (pos != std::string::npos) | |
126 | cur_pos = pos; | |
127 | ||
128 | /* Find the position of the next separator. */ | |
808480f6 | 129 | std::size_t next_sep = args_copy.find_first_of (" \t\n", cur_pos); |
7c5ded6a | 130 | |
7c5ded6a | 131 | if (next_sep == std::string::npos) |
808480f6 PA |
132 | { |
133 | /* No separator found, which means this is the last | |
134 | argument. */ | |
135 | next_sep = args_copy.size (); | |
136 | } | |
137 | else | |
138 | { | |
139 | /* Replace the separator with a terminator. */ | |
140 | args_copy[next_sep++] = '\0'; | |
141 | } | |
7c5ded6a | 142 | |
808480f6 | 143 | m_argv.push_back (&args_copy[cur_pos]); |
7c5ded6a SDJ |
144 | |
145 | cur_pos = next_sep; | |
c906108c SS |
146 | } |
147 | ||
7c5ded6a | 148 | /* NULL-terminate the vector. */ |
808480f6 | 149 | m_argv.push_back (NULL); |
c906108c SS |
150 | } |
151 | ||
808480f6 PA |
152 | /* When executing a command under the given shell, return true if the |
153 | '!' character should be escaped when embedded in a quoted | |
6037b830 JB |
154 | command-line argument. */ |
155 | ||
808480f6 | 156 | static bool |
6037b830 JB |
157 | escape_bang_in_quoted_argument (const char *shell_file) |
158 | { | |
808480f6 | 159 | size_t shell_file_len = strlen (shell_file); |
74a4fe32 | 160 | |
6037b830 JB |
161 | /* Bang should be escaped only in C Shells. For now, simply check |
162 | that the shell name ends with 'csh', which covers at least csh | |
163 | and tcsh. This should be good enough for now. */ | |
164 | ||
165 | if (shell_file_len < 3) | |
808480f6 | 166 | return false; |
6037b830 JB |
167 | |
168 | if (shell_file[shell_file_len - 3] == 'c' | |
169 | && shell_file[shell_file_len - 2] == 's' | |
170 | && shell_file[shell_file_len - 1] == 'h') | |
808480f6 PA |
171 | return true; |
172 | ||
173 | return false; | |
174 | } | |
175 | ||
176 | /* See declaration. */ | |
177 | ||
178 | execv_argv::execv_argv (const char *exec_file, | |
179 | const std::string &allargs, | |
180 | const char *shell_file) | |
181 | { | |
182 | if (shell_file == NULL) | |
183 | init_for_no_shell (exec_file, allargs); | |
184 | else | |
185 | init_for_shell (exec_file, allargs, shell_file); | |
186 | } | |
187 | ||
188 | /* See declaration. */ | |
189 | ||
190 | void | |
191 | execv_argv::init_for_shell (const char *exec_file, | |
192 | const std::string &allargs, | |
193 | const char *shell_file) | |
194 | { | |
195 | /* We're going to call a shell. */ | |
196 | bool escape_bang = escape_bang_in_quoted_argument (shell_file); | |
197 | ||
198 | /* We need to build a new shell command string, and make argv point | |
199 | to it. So build it in the storage. */ | |
200 | std::string &shell_command = m_storage; | |
201 | ||
202 | shell_command = "exec "; | |
203 | ||
204 | /* Add any exec wrapper. That may be a program name with arguments, | |
205 | so the user must handle quoting. */ | |
206 | if (exec_wrapper) | |
207 | { | |
208 | shell_command += exec_wrapper; | |
209 | shell_command += ' '; | |
210 | } | |
6037b830 | 211 | |
808480f6 PA |
212 | /* Now add exec_file, quoting as necessary. */ |
213 | ||
214 | /* Quoting in this style is said to work with all shells. But csh | |
215 | on IRIX 4.0.1 can't deal with it. So we only quote it if we need | |
216 | to. */ | |
217 | bool need_to_quote; | |
218 | const char *p = exec_file; | |
219 | while (1) | |
220 | { | |
221 | switch (*p) | |
222 | { | |
223 | case '\'': | |
224 | case '!': | |
225 | case '"': | |
226 | case '(': | |
227 | case ')': | |
228 | case '$': | |
229 | case '&': | |
230 | case ';': | |
231 | case '<': | |
232 | case '>': | |
233 | case ' ': | |
234 | case '\n': | |
235 | case '\t': | |
236 | need_to_quote = true; | |
237 | goto end_scan; | |
238 | ||
239 | case '\0': | |
240 | need_to_quote = false; | |
241 | goto end_scan; | |
242 | ||
243 | default: | |
244 | break; | |
245 | } | |
246 | ++p; | |
247 | } | |
248 | end_scan: | |
249 | if (need_to_quote) | |
250 | { | |
251 | shell_command += '\''; | |
252 | for (p = exec_file; *p != '\0'; ++p) | |
253 | { | |
254 | if (*p == '\'') | |
255 | shell_command += "'\\''"; | |
256 | else if (*p == '!' && escape_bang) | |
257 | shell_command += "\\!"; | |
258 | else | |
259 | shell_command += *p; | |
260 | } | |
261 | shell_command += '\''; | |
262 | } | |
263 | else | |
264 | shell_command += exec_file; | |
265 | ||
266 | shell_command += ' ' + allargs; | |
267 | ||
268 | /* If we decided above to start up with a shell, we exec the shell. | |
269 | "-c" says to interpret the next arg as a shell command to | |
270 | execute, and this command is "exec <target-program> <args>". */ | |
271 | m_argv.reserve (4); | |
272 | m_argv.push_back (shell_file); | |
273 | m_argv.push_back ("-c"); | |
274 | m_argv.push_back (shell_command.c_str ()); | |
275 | m_argv.push_back (NULL); | |
6037b830 | 276 | } |
c906108c | 277 | |
0db8980c SDJ |
278 | /* See inferior.h. */ |
279 | ||
280 | void | |
281 | trace_start_error (const char *fmt, ...) | |
282 | { | |
283 | va_list ap; | |
284 | ||
285 | va_start (ap, fmt); | |
286 | fprintf_unfiltered (gdb_stderr, "Could not trace the inferior " | |
287 | "process.\nError: "); | |
288 | vfprintf_unfiltered (gdb_stderr, fmt, ap); | |
1b076f25 | 289 | va_end (ap); |
0db8980c SDJ |
290 | |
291 | gdb_flush (gdb_stderr); | |
292 | _exit (0177); | |
293 | } | |
294 | ||
295 | /* See inferior.h. */ | |
296 | ||
297 | void | |
298 | trace_start_error_with_name (const char *string) | |
299 | { | |
300 | trace_start_error ("%s: %s", string, safe_strerror (errno)); | |
301 | } | |
302 | ||
74a4fe32 MK |
303 | /* Start an inferior Unix child process and sets inferior_ptid to its |
304 | pid. EXEC_FILE is the file to run. ALLARGS is a string containing | |
305 | the arguments to the program. ENV is the environment vector to | |
306 | pass. SHELL_FILE is the shell file, or NULL if we should pick | |
e69860f1 | 307 | one. EXEC_FUN is the exec(2) function to use, or NULL for the default |
74a4fe32 | 308 | one. */ |
c906108c | 309 | |
74a4fe32 MK |
310 | /* This function is NOT reentrant. Some of the variables have been |
311 | made static to ensure that they survive the vfork call. */ | |
c65ecaf3 | 312 | |
136d6dae | 313 | int |
7c5ded6a SDJ |
314 | fork_inferior (const char *exec_file_arg, const std::string &allargs, |
315 | char **env, void (*traceme_fun) (void), | |
316 | void (*init_trace_fun) (int), void (*pre_trace_fun) (void), | |
317 | char *shell_file_arg, | |
e69860f1 TG |
318 | void (*exec_fun)(const char *file, char * const *argv, |
319 | char * const *env)) | |
c906108c SS |
320 | { |
321 | int pid; | |
c906108c | 322 | static char default_shell_file[] = SHELL_FILE; |
0963b4bd | 323 | /* Set debug_fork then attach to the child while it sleeps, to debug. */ |
c906108c SS |
324 | static int debug_fork = 0; |
325 | /* This is set to the result of setpgrp, which if vforked, will be visible | |
326 | to you in the parent process. It's only used by humans for debugging. */ | |
327 | static int debug_setpgrp = 657473; | |
c65ecaf3 | 328 | static char *shell_file; |
7c5ded6a | 329 | static const char *exec_file; |
c906108c | 330 | char **save_our_env; |
3cb3b8df | 331 | const char *inferior_io_terminal = get_inferior_io_terminal (); |
6c95b8df | 332 | struct inferior *inf; |
f877b031 TG |
333 | int i; |
334 | int save_errno; | |
49940788 | 335 | struct ui *save_ui; |
c906108c | 336 | |
74a4fe32 MK |
337 | /* If no exec file handed to us, get it from the exec-file command |
338 | -- with a good, common error message if none is specified. */ | |
7c5ded6a | 339 | if (exec_file_arg == NULL) |
c906108c | 340 | exec_file = get_exec_file (1); |
7c5ded6a SDJ |
341 | else |
342 | exec_file = exec_file_arg; | |
c906108c | 343 | |
98882a26 PA |
344 | /* 'startup_with_shell' is declared in inferior.h and bound to the |
345 | "set startup-with-shell" option. If 0, we'll just do a | |
346 | fork/exec, no shell, so don't bother figuring out what shell. */ | |
98882a26 | 347 | if (startup_with_shell) |
c906108c | 348 | { |
808480f6 | 349 | shell_file = shell_file_arg; |
74a4fe32 | 350 | /* Figure out what shell to start up the user program under. */ |
c906108c SS |
351 | if (shell_file == NULL) |
352 | shell_file = getenv ("SHELL"); | |
353 | if (shell_file == NULL) | |
354 | shell_file = default_shell_file; | |
c906108c SS |
355 | } |
356 | else | |
808480f6 | 357 | shell_file = NULL; |
c906108c | 358 | |
808480f6 PA |
359 | /* Build the argument vector. */ |
360 | execv_argv child_argv (exec_file, allargs, shell_file); | |
c906108c | 361 | |
c906108c | 362 | /* Retain a copy of our environment variables, since the child will |
74a4fe32 | 363 | replace the value of environ and if we're vforked, we have to |
c906108c SS |
364 | restore it. */ |
365 | save_our_env = environ; | |
366 | ||
49940788 PA |
367 | /* Likewise the current UI. */ |
368 | save_ui = current_ui; | |
369 | ||
c906108c SS |
370 | /* Tell the terminal handling subsystem what tty we plan to run on; |
371 | it will just record the information for later. */ | |
c906108c SS |
372 | new_tty_prefork (inferior_io_terminal); |
373 | ||
374 | /* It is generally good practice to flush any possible pending stdio | |
74a4fe32 | 375 | output prior to doing a fork, to avoid the possibility of both |
0963b4bd | 376 | the parent and child flushing the same data after the fork. */ |
49940788 PA |
377 | gdb_flush (main_ui->m_gdb_stdout); |
378 | gdb_flush (main_ui->m_gdb_stderr); | |
c906108c | 379 | |
74a4fe32 MK |
380 | /* If there's any initialization of the target layers that must |
381 | happen to prepare to handle the child we're about fork, do it | |
382 | now... */ | |
c906108c SS |
383 | if (pre_trace_fun != NULL) |
384 | (*pre_trace_fun) (); | |
385 | ||
3919e12c | 386 | /* Create the child process. Since the child process is going to |
7a0b0196 | 387 | exec(3) shortly afterwards, try to reduce the overhead by |
3919e12c MK |
388 | calling vfork(2). However, if PRE_TRACE_FUN is non-null, it's |
389 | likely that this optimization won't work since there's too much | |
390 | work to do between the vfork(2) and the exec(3). This is known | |
391 | to be the case on ttrace(2)-based HP-UX, where some handshaking | |
392 | between parent and child needs to happen between fork(2) and | |
393 | exec(2). However, since the parent is suspended in the vforked | |
394 | state, this doesn't work. Also note that the vfork(2) call might | |
395 | actually be a call to fork(2) due to the fact that autoconf will | |
396 | ``#define vfork fork'' on certain platforms. */ | |
397 | if (pre_trace_fun || debug_fork) | |
c906108c SS |
398 | pid = fork (); |
399 | else | |
400 | pid = vfork (); | |
c906108c SS |
401 | |
402 | if (pid < 0) | |
e2e0b3e5 | 403 | perror_with_name (("vfork")); |
c906108c SS |
404 | |
405 | if (pid == 0) | |
406 | { | |
49940788 PA |
407 | /* Switch to the main UI, so that gdb_std{in/out/err} in the |
408 | child are mapped to std{in/out/err}. This makes it possible | |
409 | to use fprintf_unfiltered/warning/error/etc. in the child | |
410 | from here on. */ | |
411 | current_ui = main_ui; | |
412 | ||
413 | /* Close all file descriptors except those that gdb inherited | |
414 | (usually 0/1/2), so they don't leak to the inferior. Note | |
415 | that this closes the file descriptors of all secondary | |
416 | UIs. */ | |
614c279d TT |
417 | close_most_fds (); |
418 | ||
c906108c SS |
419 | if (debug_fork) |
420 | sleep (debug_fork); | |
421 | ||
83116857 TJB |
422 | /* Create a new session for the inferior process, if necessary. |
423 | It will also place the inferior in a separate process group. */ | |
424 | if (create_tty_session () <= 0) | |
425 | { | |
426 | /* No session was created, but we still want to run the inferior | |
427 | in a separate process group. */ | |
428 | debug_setpgrp = gdb_setpgid (); | |
429 | if (debug_setpgrp == -1) | |
9b20d036 | 430 | perror (_("setpgrp failed in child")); |
83116857 | 431 | } |
c906108c | 432 | |
74a4fe32 MK |
433 | /* Ask the tty subsystem to switch to the one we specified |
434 | earlier (or to share the current terminal, if none was | |
435 | specified). */ | |
c906108c SS |
436 | new_tty (); |
437 | ||
438 | /* Changing the signal handlers for the inferior after | |
c5aa993b JM |
439 | a vfork can also change them for the superior, so we don't mess |
440 | with signals here. See comments in | |
441 | initialize_signals for how we get the right signal handlers | |
442 | for the inferior. */ | |
c906108c | 443 | |
0963b4bd | 444 | /* "Trace me, Dr. Memory!" */ |
c906108c | 445 | (*traceme_fun) (); |
74a4fe32 | 446 | |
c906108c | 447 | /* The call above set this process (the "child") as debuggable |
74a4fe32 MK |
448 | by the original gdb process (the "parent"). Since processes |
449 | (unlike people) can have only one parent, if you are debugging | |
450 | gdb itself (and your debugger is thus _already_ the | |
451 | controller/parent for this child), code from here on out is | |
452 | undebuggable. Indeed, you probably got an error message | |
453 | saying "not parent". Sorry; you'll have to use print | |
454 | statements! */ | |
c906108c | 455 | |
f348d89a PA |
456 | restore_original_signals_state (); |
457 | ||
c906108c | 458 | /* There is no execlpe call, so we have to set the environment |
c5aa993b JM |
459 | for our child in the global variable. If we've vforked, this |
460 | clobbers the parent, but environ is restored a few lines down | |
461 | in the parent. By the way, yes we do need to look down the | |
462 | path to find $SHELL. Rich Pixley says so, and I agree. */ | |
c906108c SS |
463 | environ = env; |
464 | ||
808480f6 PA |
465 | char **argv = child_argv.argv (); |
466 | ||
e69860f1 | 467 | if (exec_fun != NULL) |
7c5ded6a | 468 | (*exec_fun) (argv[0], &argv[0], env); |
e69860f1 | 469 | else |
7c5ded6a | 470 | execvp (argv[0], &argv[0]); |
f877b031 TG |
471 | |
472 | /* If we get here, it's an error. */ | |
473 | save_errno = errno; | |
fe23c31f | 474 | fprintf_unfiltered (gdb_stderr, "Cannot exec %s", argv[0]); |
f877b031 TG |
475 | for (i = 1; argv[i] != NULL; i++) |
476 | fprintf_unfiltered (gdb_stderr, " %s", argv[i]); | |
477 | fprintf_unfiltered (gdb_stderr, ".\n"); | |
478 | fprintf_unfiltered (gdb_stderr, "Error: %s\n", | |
479 | safe_strerror (save_errno)); | |
480 | gdb_flush (gdb_stderr); | |
481 | _exit (0177); | |
c906108c SS |
482 | } |
483 | ||
484 | /* Restore our environment in case a vforked child clob'd it. */ | |
485 | environ = save_our_env; | |
486 | ||
49940788 PA |
487 | /* Likewise the current UI. */ |
488 | current_ui = save_ui; | |
489 | ||
d90e17a7 PA |
490 | if (!have_inferiors ()) |
491 | init_thread_list (); | |
c906108c | 492 | |
6c95b8df PA |
493 | inf = current_inferior (); |
494 | ||
495 | inferior_appeared (inf, pid); | |
7f9f62ba | 496 | |
74a4fe32 MK |
497 | /* Needed for wait_for_inferior stuff below. */ |
498 | inferior_ptid = pid_to_ptid (pid); | |
c906108c | 499 | |
191c4426 PA |
500 | new_tty_postfork (); |
501 | ||
27c9d204 PA |
502 | /* We have something that executes now. We'll be running through |
503 | the shell at this point, but the pid shouldn't change. Targets | |
504 | supporting MT should fill this task's ptid with more data as soon | |
505 | as they can. */ | |
506 | add_thread_silent (inferior_ptid); | |
507 | ||
c906108c | 508 | /* Now that we have a child process, make it our target, and |
74a4fe32 MK |
509 | initialize anything target-vector-specific that needs |
510 | initializing. */ | |
136d6dae VP |
511 | if (init_trace_fun) |
512 | (*init_trace_fun) (pid); | |
c906108c SS |
513 | |
514 | /* We are now in the child process of interest, having exec'd the | |
515 | correct program, and are poised at the first instruction of the | |
516 | new program. */ | |
136d6dae | 517 | return pid; |
c906108c SS |
518 | } |
519 | ||
c906108c SS |
520 | /* Accept NTRAPS traps from the inferior. */ |
521 | ||
522 | void | |
fba45db2 | 523 | startup_inferior (int ntraps) |
c906108c SS |
524 | { |
525 | int pending_execs = ntraps; | |
74a4fe32 | 526 | int terminal_initted = 0; |
d90e17a7 PA |
527 | ptid_t resume_ptid; |
528 | ||
98882a26 PA |
529 | if (startup_with_shell) |
530 | { | |
531 | /* One trap extra for exec'ing the shell. */ | |
532 | pending_execs++; | |
533 | } | |
534 | ||
d90e17a7 PA |
535 | if (target_supports_multi_process ()) |
536 | resume_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); | |
537 | else | |
538 | resume_ptid = minus_one_ptid; | |
c906108c | 539 | |
74a4fe32 MK |
540 | /* The process was started by the fork that created it, but it will |
541 | have stopped one instruction after execing the shell. Here we | |
542 | must get it up to actual execution of the real program. */ | |
c906108c | 543 | |
ccd213ac DJ |
544 | if (exec_wrapper) |
545 | pending_execs++; | |
546 | ||
c906108c SS |
547 | while (1) |
548 | { | |
a493e3e2 | 549 | enum gdb_signal resume_signal = GDB_SIGNAL_0; |
2e979b94 | 550 | ptid_t event_ptid; |
3c35e65b UW |
551 | |
552 | struct target_waitstatus ws; | |
553 | memset (&ws, 0, sizeof (ws)); | |
47608cb1 | 554 | event_ptid = target_wait (resume_ptid, &ws, 0); |
3c35e65b | 555 | |
2e979b94 PA |
556 | if (ws.kind == TARGET_WAITKIND_IGNORE) |
557 | /* The inferior didn't really stop, keep waiting. */ | |
558 | continue; | |
3c35e65b UW |
559 | |
560 | switch (ws.kind) | |
561 | { | |
3c35e65b UW |
562 | case TARGET_WAITKIND_SPURIOUS: |
563 | case TARGET_WAITKIND_LOADED: | |
564 | case TARGET_WAITKIND_FORKED: | |
565 | case TARGET_WAITKIND_VFORKED: | |
566 | case TARGET_WAITKIND_SYSCALL_ENTRY: | |
567 | case TARGET_WAITKIND_SYSCALL_RETURN: | |
568 | /* Ignore gracefully during startup of the inferior. */ | |
2e979b94 | 569 | switch_to_thread (event_ptid); |
3c35e65b UW |
570 | break; |
571 | ||
572 | case TARGET_WAITKIND_SIGNALLED: | |
573 | target_terminal_ours (); | |
7d5adfe3 | 574 | target_mourn_inferior (event_ptid); |
3c35e65b | 575 | error (_("During startup program terminated with signal %s, %s."), |
2ea28649 PA |
576 | gdb_signal_to_name (ws.value.sig), |
577 | gdb_signal_to_string (ws.value.sig)); | |
3c35e65b UW |
578 | return; |
579 | ||
580 | case TARGET_WAITKIND_EXITED: | |
581 | target_terminal_ours (); | |
7d5adfe3 | 582 | target_mourn_inferior (event_ptid); |
3c35e65b UW |
583 | if (ws.value.integer) |
584 | error (_("During startup program exited with code %d."), | |
585 | ws.value.integer); | |
586 | else | |
587 | error (_("During startup program exited normally.")); | |
588 | return; | |
589 | ||
590 | case TARGET_WAITKIND_EXECD: | |
591 | /* Handle EXEC signals as if they were SIGTRAP signals. */ | |
592 | xfree (ws.value.execd_pathname); | |
a493e3e2 | 593 | resume_signal = GDB_SIGNAL_TRAP; |
2e979b94 | 594 | switch_to_thread (event_ptid); |
3c35e65b UW |
595 | break; |
596 | ||
597 | case TARGET_WAITKIND_STOPPED: | |
598 | resume_signal = ws.value.sig; | |
2e979b94 | 599 | switch_to_thread (event_ptid); |
3c35e65b UW |
600 | break; |
601 | } | |
2020b7ab | 602 | |
a493e3e2 | 603 | if (resume_signal != GDB_SIGNAL_TRAP) |
c906108c | 604 | { |
3c35e65b | 605 | /* Let shell child handle its own signals in its own way. */ |
049a8570 | 606 | target_continue (resume_ptid, resume_signal); |
c906108c SS |
607 | } |
608 | else | |
609 | { | |
610 | /* We handle SIGTRAP, however; it means child did an exec. */ | |
611 | if (!terminal_initted) | |
612 | { | |
74a4fe32 MK |
613 | /* Now that the child has exec'd we know it has already |
614 | set its process group. On POSIX systems, tcsetpgrp | |
615 | will fail with EPERM if we try it before the child's | |
616 | setpgid. */ | |
c906108c SS |
617 | |
618 | /* Set up the "saved terminal modes" of the inferior | |
c5aa993b | 619 | based on what modes we are starting it with. */ |
c906108c SS |
620 | target_terminal_init (); |
621 | ||
622 | /* Install inferior's terminal modes. */ | |
623 | target_terminal_inferior (); | |
624 | ||
625 | terminal_initted = 1; | |
626 | } | |
627 | ||
74a4fe32 | 628 | if (--pending_execs == 0) |
c906108c SS |
629 | break; |
630 | ||
3c35e65b | 631 | /* Just make it go on. */ |
049a8570 | 632 | target_continue_no_signal (resume_ptid); |
c906108c SS |
633 | } |
634 | } | |
2e979b94 PA |
635 | |
636 | /* Mark all threads non-executing. */ | |
d90e17a7 | 637 | set_executing (resume_ptid, 0); |
c906108c | 638 | } |
ccd213ac DJ |
639 | |
640 | /* Implement the "unset exec-wrapper" command. */ | |
641 | ||
642 | static void | |
643 | unset_exec_wrapper_command (char *args, int from_tty) | |
644 | { | |
645 | xfree (exec_wrapper); | |
646 | exec_wrapper = NULL; | |
647 | } | |
648 | ||
98882a26 PA |
649 | static void |
650 | show_startup_with_shell (struct ui_file *file, int from_tty, | |
651 | struct cmd_list_element *c, const char *value) | |
652 | { | |
653 | fprintf_filtered (file, | |
654 | _("Use of shell to start subprocesses is %s.\n"), | |
655 | value); | |
656 | } | |
657 | ||
2c0b251b PA |
658 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
659 | extern initialize_file_ftype _initialize_fork_child; | |
660 | ||
ccd213ac DJ |
661 | void |
662 | _initialize_fork_child (void) | |
663 | { | |
664 | add_setshow_filename_cmd ("exec-wrapper", class_run, &exec_wrapper, _("\ | |
665 | Set a wrapper for running programs.\n\ | |
666 | The wrapper prepares the system and environment for the new program."), | |
667 | _("\ | |
668 | Show the wrapper for running programs."), NULL, | |
669 | NULL, NULL, | |
670 | &setlist, &showlist); | |
671 | ||
672 | add_cmd ("exec-wrapper", class_run, unset_exec_wrapper_command, | |
673 | _("Disable use of an execution wrapper."), | |
674 | &unsetlist); | |
98882a26 PA |
675 | |
676 | add_setshow_boolean_cmd ("startup-with-shell", class_support, | |
677 | &startup_with_shell, _("\ | |
678 | Set use of shell to start subprocesses. The default is on."), _("\ | |
679 | Show use of shell to start subprocesses."), NULL, | |
680 | NULL, | |
681 | show_startup_with_shell, | |
682 | &setlist, &showlist); | |
ccd213ac | 683 | } |