Commit | Line | Data |
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c906108c | 1 | /* Low level interface to ptrace, for GDB when running under Unix. |
197e01b6 | 2 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
9b254dd1 | 3 | 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
2da6aac3 | 4 | Free Software Foundation, Inc. |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
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 |
c5aa993b | 11 | (at your option) any later version. |
c906108c | 12 | |
c5aa993b JM |
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. | |
c906108c | 17 | |
c5aa993b | 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/>. */ |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include "frame.h" | |
23 | #include "inferior.h" | |
24 | #include "command.h" | |
c906108c SS |
25 | #include "serial.h" |
26 | #include "terminal.h" | |
27 | #include "target.h" | |
28 | #include "gdbthread.h" | |
29 | ||
30 | #include "gdb_string.h" | |
31 | #include <signal.h> | |
32 | #include <fcntl.h> | |
0ea3f30e | 33 | #include "gdb_select.h" |
c906108c | 34 | |
44270758 | 35 | #include "inflow.h" |
c906108c | 36 | |
c2d11a7d JM |
37 | #ifdef HAVE_SYS_IOCTL_H |
38 | #include <sys/ioctl.h> | |
39 | #endif | |
40 | ||
f2acbe1c MK |
41 | #ifndef O_NOCTTY |
42 | #define O_NOCTTY 0 | |
43 | #endif | |
44 | ||
c906108c | 45 | #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) |
a14ed312 | 46 | static void handle_sigio (int); |
c906108c SS |
47 | #endif |
48 | ||
a14ed312 | 49 | extern void _initialize_inflow (void); |
392a587b | 50 | |
a14ed312 | 51 | static void pass_signal (int); |
c906108c | 52 | |
a14ed312 | 53 | static void kill_command (char *, int); |
c906108c | 54 | |
a14ed312 | 55 | static void terminal_ours_1 (int); |
c906108c SS |
56 | \f |
57 | /* Record terminal status separately for debugger and inferior. */ | |
58 | ||
819cc324 | 59 | static struct serial *stdin_serial; |
c906108c SS |
60 | |
61 | /* TTY state for the inferior. We save it whenever the inferior stops, and | |
62 | restore it when it resumes. */ | |
63 | static serial_ttystate inferior_ttystate; | |
64 | ||
65 | /* Our own tty state, which we restore every time we need to deal with the | |
66 | terminal. We only set it once, when GDB first starts. The settings of | |
67 | flags which readline saves and restores and unimportant. */ | |
68 | static serial_ttystate our_ttystate; | |
69 | ||
70 | /* fcntl flags for us and the inferior. Saved and restored just like | |
71 | {our,inferior}_ttystate. */ | |
72 | static int tflags_inferior; | |
73 | static int tflags_ours; | |
74 | ||
75 | #ifdef PROCESS_GROUP_TYPE | |
76 | /* Process group for us and the inferior. Saved and restored just like | |
77 | {our,inferior}_ttystate. */ | |
78 | PROCESS_GROUP_TYPE our_process_group; | |
79 | PROCESS_GROUP_TYPE inferior_process_group; | |
80 | #endif | |
81 | ||
82 | /* While the inferior is running, we want SIGINT and SIGQUIT to go to the | |
83 | inferior only. If we have job control, that takes care of it. If not, | |
84 | we save our handlers in these two variables and set SIGINT and SIGQUIT | |
85 | to SIG_IGN. */ | |
86 | ||
87 | static void (*sigint_ours) (); | |
88 | static void (*sigquit_ours) (); | |
89 | ||
90 | /* The name of the tty (from the `tty' command) that we gave to the inferior | |
91 | when it was last started. */ | |
92 | ||
3cb3b8df | 93 | static const char *inferior_thisrun_terminal; |
c906108c SS |
94 | |
95 | /* Nonzero if our terminal settings are in effect. Zero if the | |
96 | inferior's settings are in effect. Ignored if !gdb_has_a_terminal | |
97 | (). */ | |
98 | ||
99 | int terminal_is_ours; | |
100 | ||
c5aa993b JM |
101 | enum |
102 | { | |
103 | yes, no, have_not_checked | |
104 | } | |
105 | gdb_has_a_terminal_flag = have_not_checked; | |
c906108c SS |
106 | |
107 | /* Does GDB have a terminal (on stdin)? */ | |
108 | int | |
fba45db2 | 109 | gdb_has_a_terminal (void) |
c906108c SS |
110 | { |
111 | switch (gdb_has_a_terminal_flag) | |
112 | { | |
113 | case yes: | |
114 | return 1; | |
115 | case no: | |
116 | return 0; | |
117 | case have_not_checked: | |
2cd58942 AC |
118 | /* Get all the current tty settings (including whether we have a |
119 | tty at all!). Can't do this in _initialize_inflow because | |
120 | serial_fdopen() won't work until the serial_ops_list is | |
121 | initialized. */ | |
c906108c SS |
122 | |
123 | #ifdef F_GETFL | |
124 | tflags_ours = fcntl (0, F_GETFL, 0); | |
125 | #endif | |
126 | ||
127 | gdb_has_a_terminal_flag = no; | |
c906108c SS |
128 | if (stdin_serial != NULL) |
129 | { | |
2cd58942 | 130 | our_ttystate = serial_get_tty_state (stdin_serial); |
c906108c SS |
131 | |
132 | if (our_ttystate != NULL) | |
133 | { | |
134 | gdb_has_a_terminal_flag = yes; | |
135 | #ifdef HAVE_TERMIOS | |
136 | our_process_group = tcgetpgrp (0); | |
137 | #endif | |
138 | #ifdef HAVE_TERMIO | |
139 | our_process_group = getpgrp (); | |
140 | #endif | |
141 | #ifdef HAVE_SGTTY | |
142 | ioctl (0, TIOCGPGRP, &our_process_group); | |
143 | #endif | |
144 | } | |
145 | } | |
146 | ||
147 | return gdb_has_a_terminal_flag == yes; | |
148 | default: | |
149 | /* "Can't happen". */ | |
150 | return 0; | |
151 | } | |
152 | } | |
153 | ||
154 | /* Macro for printing errors from ioctl operations */ | |
155 | ||
156 | #define OOPSY(what) \ | |
157 | if (result == -1) \ | |
158 | fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ | |
dc672865 | 159 | what, safe_strerror (errno)) |
c906108c | 160 | |
a14ed312 | 161 | static void terminal_ours_1 (int); |
c906108c SS |
162 | |
163 | /* Initialize the terminal settings we record for the inferior, | |
164 | before we actually run the inferior. */ | |
165 | ||
166 | void | |
fba45db2 | 167 | terminal_init_inferior_with_pgrp (int pgrp) |
c906108c SS |
168 | { |
169 | if (gdb_has_a_terminal ()) | |
170 | { | |
2cd58942 AC |
171 | /* We could just as well copy our_ttystate (if we felt like |
172 | adding a new function serial_copy_tty_state()). */ | |
c906108c | 173 | if (inferior_ttystate) |
b8c9b27d | 174 | xfree (inferior_ttystate); |
2cd58942 | 175 | inferior_ttystate = serial_get_tty_state (stdin_serial); |
c906108c SS |
176 | |
177 | #ifdef PROCESS_GROUP_TYPE | |
178 | inferior_process_group = pgrp; | |
179 | #endif | |
180 | ||
181 | /* Make sure that next time we call terminal_inferior (which will be | |
c5aa993b JM |
182 | before the program runs, as it needs to be), we install the new |
183 | process group. */ | |
c906108c SS |
184 | terminal_is_ours = 1; |
185 | } | |
186 | } | |
187 | ||
a790ad35 SC |
188 | /* Save the terminal settings again. This is necessary for the TUI |
189 | when it switches to TUI or non-TUI mode; curses changes the terminal | |
190 | and gdb must be able to restore it correctly. */ | |
191 | ||
192 | void | |
7bda5e4a | 193 | terminal_save_ours (void) |
a790ad35 SC |
194 | { |
195 | if (gdb_has_a_terminal ()) | |
196 | { | |
197 | /* We could just as well copy our_ttystate (if we felt like adding | |
198 | a new function serial_copy_tty_state). */ | |
199 | if (our_ttystate) | |
200 | xfree (our_ttystate); | |
201 | our_ttystate = serial_get_tty_state (stdin_serial); | |
202 | } | |
203 | } | |
204 | ||
c906108c | 205 | void |
fba45db2 | 206 | terminal_init_inferior (void) |
c906108c SS |
207 | { |
208 | #ifdef PROCESS_GROUP_TYPE | |
209 | /* This is for Lynx, and should be cleaned up by having Lynx be a separate | |
210 | debugging target with a version of target_terminal_init_inferior which | |
211 | passes in the process group to a generic routine which does all the work | |
212 | (and the non-threaded child_terminal_init_inferior can just pass in | |
39f77062 | 213 | inferior_ptid to the same routine). */ |
c906108c | 214 | /* We assume INFERIOR_PID is also the child's process group. */ |
39f77062 | 215 | terminal_init_inferior_with_pgrp (PIDGET (inferior_ptid)); |
c906108c SS |
216 | #endif /* PROCESS_GROUP_TYPE */ |
217 | } | |
218 | ||
219 | /* Put the inferior's terminal settings into effect. | |
220 | This is preparation for starting or resuming the inferior. */ | |
221 | ||
222 | void | |
fba45db2 | 223 | terminal_inferior (void) |
c906108c SS |
224 | { |
225 | if (gdb_has_a_terminal () && terminal_is_ours | |
2da6aac3 | 226 | && inferior_ttystate != NULL |
c906108c SS |
227 | && inferior_thisrun_terminal == 0) |
228 | { | |
229 | int result; | |
230 | ||
231 | #ifdef F_GETFL | |
232 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
233 | places we use F_SETFL, so I'm inclined to think perhaps there |
234 | is some reason, however perverse. Perhaps not though... */ | |
c906108c SS |
235 | result = fcntl (0, F_SETFL, tflags_inferior); |
236 | result = fcntl (0, F_SETFL, tflags_inferior); | |
237 | OOPSY ("fcntl F_SETFL"); | |
238 | #endif | |
239 | ||
240 | /* Because we were careful to not change in or out of raw mode in | |
c5aa993b JM |
241 | terminal_ours, we will not change in our out of raw mode with |
242 | this call, so we don't flush any input. */ | |
2cd58942 | 243 | result = serial_set_tty_state (stdin_serial, inferior_ttystate); |
c906108c SS |
244 | OOPSY ("setting tty state"); |
245 | ||
246 | if (!job_control) | |
247 | { | |
c5aa993b | 248 | sigint_ours = (void (*)()) signal (SIGINT, SIG_IGN); |
c906108c | 249 | #ifdef SIGQUIT |
c5aa993b | 250 | sigquit_ours = (void (*)()) signal (SIGQUIT, SIG_IGN); |
c906108c SS |
251 | #endif |
252 | } | |
253 | ||
254 | /* If attach_flag is set, we don't know whether we are sharing a | |
c5aa993b JM |
255 | terminal with the inferior or not. (attaching a process |
256 | without a terminal is one case where we do not; attaching a | |
257 | process which we ran from the same shell as GDB via `&' is | |
258 | one case where we do, I think (but perhaps this is not | |
259 | `sharing' in the sense that we need to save and restore tty | |
260 | state)). I don't know if there is any way to tell whether we | |
261 | are sharing a terminal. So what we do is to go through all | |
262 | the saving and restoring of the tty state, but ignore errors | |
263 | setting the process group, which will happen if we are not | |
264 | sharing a terminal). */ | |
c906108c SS |
265 | |
266 | if (job_control) | |
267 | { | |
268 | #ifdef HAVE_TERMIOS | |
269 | result = tcsetpgrp (0, inferior_process_group); | |
270 | if (!attach_flag) | |
271 | OOPSY ("tcsetpgrp"); | |
272 | #endif | |
273 | ||
274 | #ifdef HAVE_SGTTY | |
275 | result = ioctl (0, TIOCSPGRP, &inferior_process_group); | |
276 | if (!attach_flag) | |
277 | OOPSY ("TIOCSPGRP"); | |
278 | #endif | |
279 | } | |
280 | ||
281 | } | |
282 | terminal_is_ours = 0; | |
283 | } | |
284 | ||
285 | /* Put some of our terminal settings into effect, | |
286 | enough to get proper results from our output, | |
287 | but do not change into or out of RAW mode | |
288 | so that no input is discarded. | |
289 | ||
290 | After doing this, either terminal_ours or terminal_inferior | |
291 | should be called to get back to a normal state of affairs. */ | |
292 | ||
293 | void | |
fba45db2 | 294 | terminal_ours_for_output (void) |
c906108c SS |
295 | { |
296 | terminal_ours_1 (1); | |
297 | } | |
298 | ||
299 | /* Put our terminal settings into effect. | |
300 | First record the inferior's terminal settings | |
301 | so they can be restored properly later. */ | |
302 | ||
303 | void | |
fba45db2 | 304 | terminal_ours (void) |
c906108c SS |
305 | { |
306 | terminal_ours_1 (0); | |
307 | } | |
308 | ||
309 | /* output_only is not used, and should not be used unless we introduce | |
310 | separate terminal_is_ours and terminal_is_ours_for_output | |
311 | flags. */ | |
312 | ||
313 | static void | |
fba45db2 | 314 | terminal_ours_1 (int output_only) |
c906108c SS |
315 | { |
316 | /* Checking inferior_thisrun_terminal is necessary so that | |
317 | if GDB is running in the background, it won't block trying | |
318 | to do the ioctl()'s below. Checking gdb_has_a_terminal | |
319 | avoids attempting all the ioctl's when running in batch. */ | |
320 | if (inferior_thisrun_terminal != 0 || gdb_has_a_terminal () == 0) | |
321 | return; | |
322 | ||
323 | if (!terminal_is_ours) | |
324 | { | |
4b69c284 | 325 | #ifdef SIGTTOU |
c906108c | 326 | /* Ignore this signal since it will happen when we try to set the |
c5aa993b | 327 | pgrp. */ |
4b69c284 AC |
328 | void (*osigttou) () = NULL; |
329 | #endif | |
c906108c SS |
330 | int result; |
331 | ||
332 | terminal_is_ours = 1; | |
333 | ||
334 | #ifdef SIGTTOU | |
335 | if (job_control) | |
c5aa993b | 336 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
c906108c SS |
337 | #endif |
338 | ||
339 | if (inferior_ttystate) | |
b8c9b27d | 340 | xfree (inferior_ttystate); |
2cd58942 | 341 | inferior_ttystate = serial_get_tty_state (stdin_serial); |
c906108c SS |
342 | #ifdef HAVE_TERMIOS |
343 | inferior_process_group = tcgetpgrp (0); | |
344 | #endif | |
345 | #ifdef HAVE_TERMIO | |
346 | inferior_process_group = getpgrp (); | |
347 | #endif | |
348 | #ifdef HAVE_SGTTY | |
349 | ioctl (0, TIOCGPGRP, &inferior_process_group); | |
350 | #endif | |
351 | ||
352 | /* Here we used to set ICANON in our ttystate, but I believe this | |
c5aa993b JM |
353 | was an artifact from before when we used readline. Readline sets |
354 | the tty state when it needs to. | |
355 | FIXME-maybe: However, query() expects non-raw mode and doesn't | |
356 | use readline. Maybe query should use readline (on the other hand, | |
357 | this only matters for HAVE_SGTTY, not termio or termios, I think). */ | |
c906108c SS |
358 | |
359 | /* Set tty state to our_ttystate. We don't change in our out of raw | |
c5aa993b JM |
360 | mode, to avoid flushing input. We need to do the same thing |
361 | regardless of output_only, because we don't have separate | |
362 | terminal_is_ours and terminal_is_ours_for_output flags. It's OK, | |
363 | though, since readline will deal with raw mode when/if it needs to. | |
364 | */ | |
c906108c | 365 | |
2cd58942 | 366 | serial_noflush_set_tty_state (stdin_serial, our_ttystate, |
c906108c SS |
367 | inferior_ttystate); |
368 | ||
369 | if (job_control) | |
370 | { | |
371 | #ifdef HAVE_TERMIOS | |
372 | result = tcsetpgrp (0, our_process_group); | |
373 | #if 0 | |
374 | /* This fails on Ultrix with EINVAL if you run the testsuite | |
375 | in the background with nohup, and then log out. GDB never | |
376 | used to check for an error here, so perhaps there are other | |
377 | such situations as well. */ | |
378 | if (result == -1) | |
379 | fprintf_unfiltered (gdb_stderr, "[tcsetpgrp failed in terminal_ours: %s]\n", | |
dc672865 | 380 | safe_strerror (errno)); |
c906108c SS |
381 | #endif |
382 | #endif /* termios */ | |
383 | ||
384 | #ifdef HAVE_SGTTY | |
385 | result = ioctl (0, TIOCSPGRP, &our_process_group); | |
386 | #endif | |
387 | } | |
388 | ||
389 | #ifdef SIGTTOU | |
390 | if (job_control) | |
391 | signal (SIGTTOU, osigttou); | |
392 | #endif | |
393 | ||
394 | if (!job_control) | |
395 | { | |
396 | signal (SIGINT, sigint_ours); | |
397 | #ifdef SIGQUIT | |
398 | signal (SIGQUIT, sigquit_ours); | |
399 | #endif | |
400 | } | |
401 | ||
402 | #ifdef F_GETFL | |
403 | tflags_inferior = fcntl (0, F_GETFL, 0); | |
404 | ||
405 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
406 | places we use F_SETFL, so I'm inclined to think perhaps there |
407 | is some reason, however perverse. Perhaps not though... */ | |
c906108c SS |
408 | result = fcntl (0, F_SETFL, tflags_ours); |
409 | result = fcntl (0, F_SETFL, tflags_ours); | |
410 | #endif | |
c906108c SS |
411 | } |
412 | } | |
413 | ||
c906108c | 414 | void |
fba45db2 | 415 | term_info (char *arg, int from_tty) |
c906108c SS |
416 | { |
417 | target_terminal_info (arg, from_tty); | |
418 | } | |
419 | ||
c906108c | 420 | void |
fba45db2 | 421 | child_terminal_info (char *args, int from_tty) |
c906108c SS |
422 | { |
423 | if (!gdb_has_a_terminal ()) | |
424 | { | |
a3f17187 | 425 | printf_filtered (_("This GDB does not control a terminal.\n")); |
c906108c SS |
426 | return; |
427 | } | |
428 | ||
a3f17187 | 429 | printf_filtered (_("Inferior's terminal status (currently saved by GDB):\n")); |
c906108c SS |
430 | |
431 | /* First the fcntl flags. */ | |
432 | { | |
433 | int flags; | |
c5aa993b | 434 | |
c906108c SS |
435 | flags = tflags_inferior; |
436 | ||
437 | printf_filtered ("File descriptor flags = "); | |
438 | ||
439 | #ifndef O_ACCMODE | |
440 | #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) | |
441 | #endif | |
442 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug */ | |
443 | switch (flags & (O_ACCMODE)) | |
444 | { | |
c5aa993b JM |
445 | case O_RDONLY: |
446 | printf_filtered ("O_RDONLY"); | |
447 | break; | |
448 | case O_WRONLY: | |
449 | printf_filtered ("O_WRONLY"); | |
450 | break; | |
451 | case O_RDWR: | |
452 | printf_filtered ("O_RDWR"); | |
453 | break; | |
c906108c SS |
454 | } |
455 | flags &= ~(O_ACCMODE); | |
456 | ||
457 | #ifdef O_NONBLOCK | |
c5aa993b | 458 | if (flags & O_NONBLOCK) |
c906108c SS |
459 | printf_filtered (" | O_NONBLOCK"); |
460 | flags &= ~O_NONBLOCK; | |
461 | #endif | |
c5aa993b | 462 | |
c906108c SS |
463 | #if defined (O_NDELAY) |
464 | /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will | |
465 | print it as O_NONBLOCK, which is good cause that is what POSIX | |
466 | has, and the flag will already be cleared by the time we get here. */ | |
467 | if (flags & O_NDELAY) | |
468 | printf_filtered (" | O_NDELAY"); | |
469 | flags &= ~O_NDELAY; | |
470 | #endif | |
471 | ||
472 | if (flags & O_APPEND) | |
473 | printf_filtered (" | O_APPEND"); | |
474 | flags &= ~O_APPEND; | |
475 | ||
476 | #if defined (O_BINARY) | |
477 | if (flags & O_BINARY) | |
478 | printf_filtered (" | O_BINARY"); | |
479 | flags &= ~O_BINARY; | |
480 | #endif | |
481 | ||
482 | if (flags) | |
483 | printf_filtered (" | 0x%x", flags); | |
484 | printf_filtered ("\n"); | |
485 | } | |
486 | ||
487 | #ifdef PROCESS_GROUP_TYPE | |
2acceee2 JM |
488 | printf_filtered ("Process group = %d\n", |
489 | (int) inferior_process_group); | |
c906108c SS |
490 | #endif |
491 | ||
2cd58942 | 492 | serial_print_tty_state (stdin_serial, inferior_ttystate, gdb_stdout); |
c906108c SS |
493 | } |
494 | \f | |
495 | /* NEW_TTY_PREFORK is called before forking a new child process, | |
496 | so we can record the state of ttys in the child to be formed. | |
497 | TTYNAME is null if we are to share the terminal with gdb; | |
498 | or points to a string containing the name of the desired tty. | |
499 | ||
500 | NEW_TTY is called in new child processes under Unix, which will | |
501 | become debugger target processes. This actually switches to | |
502 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
503 | ||
504 | void | |
3cb3b8df | 505 | new_tty_prefork (const char *ttyname) |
c906108c SS |
506 | { |
507 | /* Save the name for later, for determining whether we and the child | |
508 | are sharing a tty. */ | |
509 | inferior_thisrun_terminal = ttyname; | |
510 | } | |
511 | ||
512 | void | |
fba45db2 | 513 | new_tty (void) |
c906108c | 514 | { |
52f0bd74 | 515 | int tty; |
c906108c SS |
516 | |
517 | if (inferior_thisrun_terminal == 0) | |
518 | return; | |
519 | #if !defined(__GO32__) && !defined(_WIN32) | |
520 | #ifdef TIOCNOTTY | |
521 | /* Disconnect the child process from our controlling terminal. On some | |
522 | systems (SVR4 for example), this may cause a SIGTTOU, so temporarily | |
523 | ignore SIGTTOU. */ | |
c5aa993b | 524 | tty = open ("/dev/tty", O_RDWR); |
c906108c SS |
525 | if (tty > 0) |
526 | { | |
527 | void (*osigttou) (); | |
528 | ||
c5aa993b JM |
529 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
530 | ioctl (tty, TIOCNOTTY, 0); | |
531 | close (tty); | |
532 | signal (SIGTTOU, osigttou); | |
c906108c SS |
533 | } |
534 | #endif | |
535 | ||
536 | /* Now open the specified new terminal. */ | |
c5aa993b | 537 | tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
c906108c SS |
538 | if (tty == -1) |
539 | { | |
540 | print_sys_errmsg (inferior_thisrun_terminal, errno); | |
c5aa993b | 541 | _exit (1); |
c906108c SS |
542 | } |
543 | ||
544 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
545 | if (tty != 0) | |
c5aa993b JM |
546 | { |
547 | close (0); | |
548 | dup (tty); | |
549 | } | |
c906108c | 550 | if (tty != 1) |
c5aa993b JM |
551 | { |
552 | close (1); | |
553 | dup (tty); | |
554 | } | |
c906108c | 555 | if (tty != 2) |
c5aa993b JM |
556 | { |
557 | close (2); | |
558 | dup (tty); | |
559 | } | |
83116857 TJB |
560 | |
561 | #ifdef TIOCSCTTY | |
562 | /* Make tty our new controlling terminal. */ | |
563 | if (ioctl (tty, TIOCSCTTY, 0) == -1) | |
564 | /* Mention GDB in warning because it will appear in the inferior's | |
565 | terminal instead of GDB's. */ | |
566 | warning ("GDB: Failed to set controlling terminal: %s", | |
567 | safe_strerror (errno)); | |
568 | #endif | |
569 | ||
c906108c | 570 | if (tty > 2) |
c5aa993b JM |
571 | close (tty); |
572 | #endif /* !go32 && !win32 */ | |
c906108c SS |
573 | } |
574 | \f | |
575 | /* Kill the inferior process. Make us have no inferior. */ | |
576 | ||
c906108c | 577 | static void |
fba45db2 | 578 | kill_command (char *arg, int from_tty) |
c906108c | 579 | { |
39f77062 | 580 | /* FIXME: This should not really be inferior_ptid (or target_has_execution). |
c906108c SS |
581 | It should be a distinct flag that indicates that a target is active, cuz |
582 | some targets don't have processes! */ | |
583 | ||
39f77062 | 584 | if (ptid_equal (inferior_ptid, null_ptid)) |
8a3fe4f8 | 585 | error (_("The program is not being run.")); |
c906108c | 586 | if (!query ("Kill the program being debugged? ")) |
8a3fe4f8 | 587 | error (_("Not confirmed.")); |
c906108c SS |
588 | target_kill (); |
589 | ||
c5aa993b | 590 | init_thread_list (); /* Destroy thread info */ |
c906108c SS |
591 | |
592 | /* Killing off the inferior can leave us with a core file. If so, | |
593 | print the state we are left in. */ | |
c5aa993b JM |
594 | if (target_has_stack) |
595 | { | |
a3f17187 | 596 | printf_filtered (_("In %s,\n"), target_longname); |
206415a3 | 597 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); |
c5aa993b | 598 | } |
ce7d4522 | 599 | bfd_cache_close_all (); |
c906108c SS |
600 | } |
601 | \f | |
602 | /* Call set_sigint_trap when you need to pass a signal on to an attached | |
603 | process when handling SIGINT */ | |
604 | ||
c906108c | 605 | static void |
fba45db2 | 606 | pass_signal (int signo) |
c906108c SS |
607 | { |
608 | #ifndef _WIN32 | |
39f77062 | 609 | kill (PIDGET (inferior_ptid), SIGINT); |
c906108c SS |
610 | #endif |
611 | } | |
612 | ||
c5aa993b | 613 | static void (*osig) (); |
c906108c SS |
614 | |
615 | void | |
fba45db2 | 616 | set_sigint_trap (void) |
c906108c SS |
617 | { |
618 | if (attach_flag || inferior_thisrun_terminal) | |
619 | { | |
c5aa993b | 620 | osig = (void (*)()) signal (SIGINT, pass_signal); |
c906108c SS |
621 | } |
622 | } | |
623 | ||
624 | void | |
fba45db2 | 625 | clear_sigint_trap (void) |
c906108c SS |
626 | { |
627 | if (attach_flag || inferior_thisrun_terminal) | |
628 | { | |
629 | signal (SIGINT, osig); | |
630 | } | |
631 | } | |
632 | \f | |
633 | #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) | |
634 | static void (*old_sigio) (); | |
635 | ||
636 | static void | |
fba45db2 | 637 | handle_sigio (int signo) |
c906108c SS |
638 | { |
639 | int numfds; | |
640 | fd_set readfds; | |
641 | ||
642 | signal (SIGIO, handle_sigio); | |
643 | ||
644 | FD_ZERO (&readfds); | |
645 | FD_SET (target_activity_fd, &readfds); | |
0ea3f30e | 646 | numfds = gdb_select (target_activity_fd + 1, &readfds, NULL, NULL, NULL); |
c906108c SS |
647 | if (numfds >= 0 && FD_ISSET (target_activity_fd, &readfds)) |
648 | { | |
649 | #ifndef _WIN32 | |
650 | if ((*target_activity_function) ()) | |
39f77062 | 651 | kill (PIDGET (inferior_ptid), SIGINT); |
c906108c SS |
652 | #endif |
653 | } | |
654 | } | |
655 | ||
656 | static int old_fcntl_flags; | |
657 | ||
658 | void | |
fba45db2 | 659 | set_sigio_trap (void) |
c906108c SS |
660 | { |
661 | if (target_activity_function) | |
662 | { | |
c5aa993b JM |
663 | old_sigio = (void (*)()) signal (SIGIO, handle_sigio); |
664 | fcntl (target_activity_fd, F_SETOWN, getpid ()); | |
c906108c SS |
665 | old_fcntl_flags = fcntl (target_activity_fd, F_GETFL, 0); |
666 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags | FASYNC); | |
667 | } | |
668 | } | |
669 | ||
670 | void | |
fba45db2 | 671 | clear_sigio_trap (void) |
c906108c SS |
672 | { |
673 | if (target_activity_function) | |
674 | { | |
675 | signal (SIGIO, old_sigio); | |
676 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags); | |
677 | } | |
678 | } | |
679 | #else /* No SIGIO. */ | |
680 | void | |
fba45db2 | 681 | set_sigio_trap (void) |
c906108c SS |
682 | { |
683 | if (target_activity_function) | |
e2e0b3e5 | 684 | internal_error (__FILE__, __LINE__, _("failed internal consistency check")); |
c906108c SS |
685 | } |
686 | ||
687 | void | |
fba45db2 | 688 | clear_sigio_trap (void) |
c906108c SS |
689 | { |
690 | if (target_activity_function) | |
e2e0b3e5 | 691 | internal_error (__FILE__, __LINE__, _("failed internal consistency check")); |
c906108c SS |
692 | } |
693 | #endif /* No SIGIO. */ | |
694 | \f | |
695 | ||
83116857 TJB |
696 | /* Create a new session if the inferior will run in a different tty. |
697 | A session is UNIX's way of grouping processes that share a controlling | |
698 | terminal, so a new one is needed if the inferior terminal will be | |
699 | different from GDB's. | |
700 | ||
701 | Returns the session id of the new session, 0 if no session was created | |
702 | or -1 if an error occurred. */ | |
703 | pid_t | |
704 | create_tty_session (void) | |
705 | { | |
706 | #ifdef HAVE_SETSID | |
707 | pid_t ret; | |
708 | ||
709 | if (!job_control || inferior_thisrun_terminal == 0) | |
710 | return 0; | |
711 | ||
712 | ret = setsid (); | |
713 | if (ret == -1) | |
714 | warning ("Failed to create new terminal session: setsid: %s", | |
715 | safe_strerror (errno)); | |
716 | ||
717 | return ret; | |
718 | #else | |
719 | return 0; | |
720 | #endif /* HAVE_SETSID */ | |
721 | } | |
722 | ||
c906108c SS |
723 | /* This is here because this is where we figure out whether we (probably) |
724 | have job control. Just using job_control only does part of it because | |
725 | setpgid or setpgrp might not exist on a system without job control. | |
726 | It might be considered misplaced (on the other hand, process groups and | |
727 | job control are closely related to ttys). | |
728 | ||
729 | For a more clean implementation, in libiberty, put a setpgid which merely | |
730 | calls setpgrp and a setpgrp which does nothing (any system with job control | |
731 | will have one or the other). */ | |
732 | int | |
fba45db2 | 733 | gdb_setpgid (void) |
c906108c SS |
734 | { |
735 | int retval = 0; | |
736 | ||
737 | if (job_control) | |
738 | { | |
0200359f MK |
739 | #if defined (HAVE_TERMIOS) || defined (TIOCGPGRP) |
740 | #ifdef HAVE_SETPGID | |
741 | /* The call setpgid (0, 0) is supposed to work and mean the same | |
742 | thing as this, but on Ultrix 4.2A it fails with EPERM (and | |
c5aa993b | 743 | setpgid (getpid (), getpid ()) succeeds). */ |
c906108c SS |
744 | retval = setpgid (getpid (), getpid ()); |
745 | #else | |
0200359f MK |
746 | #ifdef HAVE_SETPGRP |
747 | #ifdef SETPGRP_VOID | |
c906108c SS |
748 | retval = setpgrp (); |
749 | #else | |
750 | retval = setpgrp (getpid (), getpid ()); | |
0200359f MK |
751 | #endif |
752 | #endif /* HAVE_SETPGRP */ | |
753 | #endif /* HAVE_SETPGID */ | |
754 | #endif /* defined (HAVE_TERMIOS) || defined (TIOCGPGRP) */ | |
c906108c | 755 | } |
0200359f | 756 | |
c906108c SS |
757 | return retval; |
758 | } | |
759 | ||
0ea3f30e DJ |
760 | /* Get all the current tty settings (including whether we have a |
761 | tty at all!). We can't do this in _initialize_inflow because | |
762 | serial_fdopen() won't work until the serial_ops_list is | |
763 | initialized, but we don't want to do it lazily either, so | |
764 | that we can guarantee stdin_serial is opened if there is | |
765 | a terminal. */ | |
766 | void | |
767 | initialize_stdin_serial (void) | |
768 | { | |
769 | stdin_serial = serial_fdopen (0); | |
770 | } | |
771 | ||
c906108c | 772 | void |
fba45db2 | 773 | _initialize_inflow (void) |
c906108c SS |
774 | { |
775 | add_info ("terminal", term_info, | |
1bedd215 | 776 | _("Print inferior's saved terminal status.")); |
c906108c SS |
777 | |
778 | add_com ("kill", class_run, kill_command, | |
1bedd215 | 779 | _("Kill execution of program being debugged.")); |
c906108c | 780 | |
39f77062 | 781 | inferior_ptid = null_ptid; |
c906108c SS |
782 | |
783 | terminal_is_ours = 1; | |
784 | ||
785 | /* OK, figure out whether we have job control. If neither termios nor | |
786 | sgtty (i.e. termio or go32), leave job_control 0. */ | |
787 | ||
788 | #if defined (HAVE_TERMIOS) | |
789 | /* Do all systems with termios have the POSIX way of identifying job | |
790 | control? I hope so. */ | |
791 | #ifdef _POSIX_JOB_CONTROL | |
792 | job_control = 1; | |
793 | #else | |
794 | #ifdef _SC_JOB_CONTROL | |
795 | job_control = sysconf (_SC_JOB_CONTROL); | |
796 | #else | |
c5aa993b JM |
797 | job_control = 0; /* have to assume the worst */ |
798 | #endif /* _SC_JOB_CONTROL */ | |
799 | #endif /* _POSIX_JOB_CONTROL */ | |
800 | #endif /* HAVE_TERMIOS */ | |
c906108c SS |
801 | |
802 | #ifdef HAVE_SGTTY | |
803 | #ifdef TIOCGPGRP | |
804 | job_control = 1; | |
805 | #else | |
806 | job_control = 0; | |
807 | #endif /* TIOCGPGRP */ | |
808 | #endif /* sgtty */ | |
809 | } |