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 | ||
64a0ac84 PA |
101 | #ifdef PROCESS_GROUP_TYPE |
102 | static PROCESS_GROUP_TYPE | |
103 | gdb_getpgrp (void) | |
104 | { | |
105 | int process_group = -1; | |
106 | #ifdef HAVE_TERMIOS | |
107 | process_group = tcgetpgrp (0); | |
108 | #endif | |
109 | #ifdef HAVE_TERMIO | |
110 | process_group = getpgrp (); | |
111 | #endif | |
112 | #ifdef HAVE_SGTTY | |
113 | ioctl (0, TIOCGPGRP, &process_group); | |
114 | #endif | |
115 | return process_group; | |
116 | } | |
117 | #endif | |
118 | ||
c5aa993b JM |
119 | enum |
120 | { | |
121 | yes, no, have_not_checked | |
122 | } | |
123 | gdb_has_a_terminal_flag = have_not_checked; | |
c906108c SS |
124 | |
125 | /* Does GDB have a terminal (on stdin)? */ | |
126 | int | |
fba45db2 | 127 | gdb_has_a_terminal (void) |
c906108c SS |
128 | { |
129 | switch (gdb_has_a_terminal_flag) | |
130 | { | |
131 | case yes: | |
132 | return 1; | |
133 | case no: | |
134 | return 0; | |
135 | case have_not_checked: | |
2cd58942 AC |
136 | /* Get all the current tty settings (including whether we have a |
137 | tty at all!). Can't do this in _initialize_inflow because | |
138 | serial_fdopen() won't work until the serial_ops_list is | |
139 | initialized. */ | |
c906108c SS |
140 | |
141 | #ifdef F_GETFL | |
142 | tflags_ours = fcntl (0, F_GETFL, 0); | |
143 | #endif | |
144 | ||
145 | gdb_has_a_terminal_flag = no; | |
c906108c SS |
146 | if (stdin_serial != NULL) |
147 | { | |
2cd58942 | 148 | our_ttystate = serial_get_tty_state (stdin_serial); |
c906108c SS |
149 | |
150 | if (our_ttystate != NULL) | |
151 | { | |
152 | gdb_has_a_terminal_flag = yes; | |
64a0ac84 | 153 | our_process_group = gdb_getpgrp (); |
c906108c SS |
154 | } |
155 | } | |
156 | ||
157 | return gdb_has_a_terminal_flag == yes; | |
158 | default: | |
159 | /* "Can't happen". */ | |
160 | return 0; | |
161 | } | |
162 | } | |
163 | ||
164 | /* Macro for printing errors from ioctl operations */ | |
165 | ||
166 | #define OOPSY(what) \ | |
167 | if (result == -1) \ | |
168 | fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ | |
dc672865 | 169 | what, safe_strerror (errno)) |
c906108c | 170 | |
a14ed312 | 171 | static void terminal_ours_1 (int); |
c906108c SS |
172 | |
173 | /* Initialize the terminal settings we record for the inferior, | |
174 | before we actually run the inferior. */ | |
175 | ||
176 | void | |
fba45db2 | 177 | terminal_init_inferior_with_pgrp (int pgrp) |
c906108c SS |
178 | { |
179 | if (gdb_has_a_terminal ()) | |
180 | { | |
2cd58942 AC |
181 | /* We could just as well copy our_ttystate (if we felt like |
182 | adding a new function serial_copy_tty_state()). */ | |
c906108c | 183 | if (inferior_ttystate) |
b8c9b27d | 184 | xfree (inferior_ttystate); |
2cd58942 | 185 | inferior_ttystate = serial_get_tty_state (stdin_serial); |
c906108c SS |
186 | |
187 | #ifdef PROCESS_GROUP_TYPE | |
188 | inferior_process_group = pgrp; | |
189 | #endif | |
190 | ||
191 | /* Make sure that next time we call terminal_inferior (which will be | |
c5aa993b JM |
192 | before the program runs, as it needs to be), we install the new |
193 | process group. */ | |
c906108c SS |
194 | terminal_is_ours = 1; |
195 | } | |
196 | } | |
197 | ||
a790ad35 SC |
198 | /* Save the terminal settings again. This is necessary for the TUI |
199 | when it switches to TUI or non-TUI mode; curses changes the terminal | |
200 | and gdb must be able to restore it correctly. */ | |
201 | ||
202 | void | |
7bda5e4a | 203 | terminal_save_ours (void) |
a790ad35 SC |
204 | { |
205 | if (gdb_has_a_terminal ()) | |
206 | { | |
207 | /* We could just as well copy our_ttystate (if we felt like adding | |
208 | a new function serial_copy_tty_state). */ | |
209 | if (our_ttystate) | |
210 | xfree (our_ttystate); | |
211 | our_ttystate = serial_get_tty_state (stdin_serial); | |
212 | } | |
213 | } | |
214 | ||
c906108c | 215 | void |
fba45db2 | 216 | terminal_init_inferior (void) |
c906108c SS |
217 | { |
218 | #ifdef PROCESS_GROUP_TYPE | |
219 | /* This is for Lynx, and should be cleaned up by having Lynx be a separate | |
220 | debugging target with a version of target_terminal_init_inferior which | |
221 | passes in the process group to a generic routine which does all the work | |
222 | (and the non-threaded child_terminal_init_inferior can just pass in | |
39f77062 | 223 | inferior_ptid to the same routine). */ |
c906108c | 224 | /* We assume INFERIOR_PID is also the child's process group. */ |
39f77062 | 225 | terminal_init_inferior_with_pgrp (PIDGET (inferior_ptid)); |
c906108c SS |
226 | #endif /* PROCESS_GROUP_TYPE */ |
227 | } | |
228 | ||
229 | /* Put the inferior's terminal settings into effect. | |
230 | This is preparation for starting or resuming the inferior. */ | |
231 | ||
232 | void | |
fba45db2 | 233 | terminal_inferior (void) |
c906108c SS |
234 | { |
235 | if (gdb_has_a_terminal () && terminal_is_ours | |
2da6aac3 | 236 | && inferior_ttystate != NULL |
c906108c SS |
237 | && inferior_thisrun_terminal == 0) |
238 | { | |
239 | int result; | |
240 | ||
241 | #ifdef F_GETFL | |
242 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
243 | places we use F_SETFL, so I'm inclined to think perhaps there |
244 | is some reason, however perverse. Perhaps not though... */ | |
c906108c SS |
245 | result = fcntl (0, F_SETFL, tflags_inferior); |
246 | result = fcntl (0, F_SETFL, tflags_inferior); | |
247 | OOPSY ("fcntl F_SETFL"); | |
248 | #endif | |
249 | ||
250 | /* Because we were careful to not change in or out of raw mode in | |
c5aa993b JM |
251 | terminal_ours, we will not change in our out of raw mode with |
252 | this call, so we don't flush any input. */ | |
2cd58942 | 253 | result = serial_set_tty_state (stdin_serial, inferior_ttystate); |
c906108c SS |
254 | OOPSY ("setting tty state"); |
255 | ||
256 | if (!job_control) | |
257 | { | |
c5aa993b | 258 | sigint_ours = (void (*)()) signal (SIGINT, SIG_IGN); |
c906108c | 259 | #ifdef SIGQUIT |
c5aa993b | 260 | sigquit_ours = (void (*)()) signal (SIGQUIT, SIG_IGN); |
c906108c SS |
261 | #endif |
262 | } | |
263 | ||
264 | /* If attach_flag is set, we don't know whether we are sharing a | |
c5aa993b JM |
265 | terminal with the inferior or not. (attaching a process |
266 | without a terminal is one case where we do not; attaching a | |
267 | process which we ran from the same shell as GDB via `&' is | |
268 | one case where we do, I think (but perhaps this is not | |
269 | `sharing' in the sense that we need to save and restore tty | |
270 | state)). I don't know if there is any way to tell whether we | |
271 | are sharing a terminal. So what we do is to go through all | |
272 | the saving and restoring of the tty state, but ignore errors | |
273 | setting the process group, which will happen if we are not | |
274 | sharing a terminal). */ | |
c906108c SS |
275 | |
276 | if (job_control) | |
277 | { | |
278 | #ifdef HAVE_TERMIOS | |
279 | result = tcsetpgrp (0, inferior_process_group); | |
280 | if (!attach_flag) | |
281 | OOPSY ("tcsetpgrp"); | |
282 | #endif | |
283 | ||
284 | #ifdef HAVE_SGTTY | |
285 | result = ioctl (0, TIOCSPGRP, &inferior_process_group); | |
286 | if (!attach_flag) | |
287 | OOPSY ("TIOCSPGRP"); | |
288 | #endif | |
289 | } | |
290 | ||
291 | } | |
292 | terminal_is_ours = 0; | |
293 | } | |
294 | ||
295 | /* Put some of our terminal settings into effect, | |
296 | enough to get proper results from our output, | |
297 | but do not change into or out of RAW mode | |
298 | so that no input is discarded. | |
299 | ||
300 | After doing this, either terminal_ours or terminal_inferior | |
301 | should be called to get back to a normal state of affairs. */ | |
302 | ||
303 | void | |
fba45db2 | 304 | terminal_ours_for_output (void) |
c906108c SS |
305 | { |
306 | terminal_ours_1 (1); | |
307 | } | |
308 | ||
309 | /* Put our terminal settings into effect. | |
310 | First record the inferior's terminal settings | |
311 | so they can be restored properly later. */ | |
312 | ||
313 | void | |
fba45db2 | 314 | terminal_ours (void) |
c906108c SS |
315 | { |
316 | terminal_ours_1 (0); | |
317 | } | |
318 | ||
319 | /* output_only is not used, and should not be used unless we introduce | |
320 | separate terminal_is_ours and terminal_is_ours_for_output | |
321 | flags. */ | |
322 | ||
323 | static void | |
fba45db2 | 324 | terminal_ours_1 (int output_only) |
c906108c SS |
325 | { |
326 | /* Checking inferior_thisrun_terminal is necessary so that | |
327 | if GDB is running in the background, it won't block trying | |
328 | to do the ioctl()'s below. Checking gdb_has_a_terminal | |
329 | avoids attempting all the ioctl's when running in batch. */ | |
330 | if (inferior_thisrun_terminal != 0 || gdb_has_a_terminal () == 0) | |
331 | return; | |
332 | ||
333 | if (!terminal_is_ours) | |
334 | { | |
4b69c284 | 335 | #ifdef SIGTTOU |
c906108c | 336 | /* Ignore this signal since it will happen when we try to set the |
c5aa993b | 337 | pgrp. */ |
4b69c284 AC |
338 | void (*osigttou) () = NULL; |
339 | #endif | |
c906108c SS |
340 | int result; |
341 | ||
342 | terminal_is_ours = 1; | |
343 | ||
344 | #ifdef SIGTTOU | |
345 | if (job_control) | |
c5aa993b | 346 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
c906108c SS |
347 | #endif |
348 | ||
349 | if (inferior_ttystate) | |
b8c9b27d | 350 | xfree (inferior_ttystate); |
2cd58942 | 351 | inferior_ttystate = serial_get_tty_state (stdin_serial); |
64a0ac84 PA |
352 | |
353 | if (!attach_flag) | |
354 | /* If setpgrp failed in terminal_inferior, this would give us | |
355 | our process group instead of the inferior's. See | |
356 | terminal_inferior for details. */ | |
357 | inferior_process_group = gdb_getpgrp (); | |
c906108c SS |
358 | |
359 | /* Here we used to set ICANON in our ttystate, but I believe this | |
c5aa993b JM |
360 | was an artifact from before when we used readline. Readline sets |
361 | the tty state when it needs to. | |
362 | FIXME-maybe: However, query() expects non-raw mode and doesn't | |
363 | use readline. Maybe query should use readline (on the other hand, | |
364 | this only matters for HAVE_SGTTY, not termio or termios, I think). */ | |
c906108c SS |
365 | |
366 | /* Set tty state to our_ttystate. We don't change in our out of raw | |
c5aa993b JM |
367 | mode, to avoid flushing input. We need to do the same thing |
368 | regardless of output_only, because we don't have separate | |
369 | terminal_is_ours and terminal_is_ours_for_output flags. It's OK, | |
370 | though, since readline will deal with raw mode when/if it needs to. | |
371 | */ | |
c906108c | 372 | |
2cd58942 | 373 | serial_noflush_set_tty_state (stdin_serial, our_ttystate, |
c906108c SS |
374 | inferior_ttystate); |
375 | ||
376 | if (job_control) | |
377 | { | |
378 | #ifdef HAVE_TERMIOS | |
379 | result = tcsetpgrp (0, our_process_group); | |
380 | #if 0 | |
381 | /* This fails on Ultrix with EINVAL if you run the testsuite | |
382 | in the background with nohup, and then log out. GDB never | |
383 | used to check for an error here, so perhaps there are other | |
384 | such situations as well. */ | |
385 | if (result == -1) | |
386 | fprintf_unfiltered (gdb_stderr, "[tcsetpgrp failed in terminal_ours: %s]\n", | |
dc672865 | 387 | safe_strerror (errno)); |
c906108c SS |
388 | #endif |
389 | #endif /* termios */ | |
390 | ||
391 | #ifdef HAVE_SGTTY | |
392 | result = ioctl (0, TIOCSPGRP, &our_process_group); | |
393 | #endif | |
394 | } | |
395 | ||
396 | #ifdef SIGTTOU | |
397 | if (job_control) | |
398 | signal (SIGTTOU, osigttou); | |
399 | #endif | |
400 | ||
401 | if (!job_control) | |
402 | { | |
403 | signal (SIGINT, sigint_ours); | |
404 | #ifdef SIGQUIT | |
405 | signal (SIGQUIT, sigquit_ours); | |
406 | #endif | |
407 | } | |
408 | ||
409 | #ifdef F_GETFL | |
410 | tflags_inferior = fcntl (0, F_GETFL, 0); | |
411 | ||
412 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
413 | places we use F_SETFL, so I'm inclined to think perhaps there |
414 | is some reason, however perverse. Perhaps not though... */ | |
c906108c SS |
415 | result = fcntl (0, F_SETFL, tflags_ours); |
416 | result = fcntl (0, F_SETFL, tflags_ours); | |
417 | #endif | |
c906108c SS |
418 | } |
419 | } | |
420 | ||
c906108c | 421 | void |
fba45db2 | 422 | term_info (char *arg, int from_tty) |
c906108c SS |
423 | { |
424 | target_terminal_info (arg, from_tty); | |
425 | } | |
426 | ||
c906108c | 427 | void |
fba45db2 | 428 | child_terminal_info (char *args, int from_tty) |
c906108c SS |
429 | { |
430 | if (!gdb_has_a_terminal ()) | |
431 | { | |
a3f17187 | 432 | printf_filtered (_("This GDB does not control a terminal.\n")); |
c906108c SS |
433 | return; |
434 | } | |
435 | ||
a3f17187 | 436 | printf_filtered (_("Inferior's terminal status (currently saved by GDB):\n")); |
c906108c SS |
437 | |
438 | /* First the fcntl flags. */ | |
439 | { | |
440 | int flags; | |
c5aa993b | 441 | |
c906108c SS |
442 | flags = tflags_inferior; |
443 | ||
444 | printf_filtered ("File descriptor flags = "); | |
445 | ||
446 | #ifndef O_ACCMODE | |
447 | #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) | |
448 | #endif | |
449 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug */ | |
450 | switch (flags & (O_ACCMODE)) | |
451 | { | |
c5aa993b JM |
452 | case O_RDONLY: |
453 | printf_filtered ("O_RDONLY"); | |
454 | break; | |
455 | case O_WRONLY: | |
456 | printf_filtered ("O_WRONLY"); | |
457 | break; | |
458 | case O_RDWR: | |
459 | printf_filtered ("O_RDWR"); | |
460 | break; | |
c906108c SS |
461 | } |
462 | flags &= ~(O_ACCMODE); | |
463 | ||
464 | #ifdef O_NONBLOCK | |
c5aa993b | 465 | if (flags & O_NONBLOCK) |
c906108c SS |
466 | printf_filtered (" | O_NONBLOCK"); |
467 | flags &= ~O_NONBLOCK; | |
468 | #endif | |
c5aa993b | 469 | |
c906108c SS |
470 | #if defined (O_NDELAY) |
471 | /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will | |
472 | print it as O_NONBLOCK, which is good cause that is what POSIX | |
473 | has, and the flag will already be cleared by the time we get here. */ | |
474 | if (flags & O_NDELAY) | |
475 | printf_filtered (" | O_NDELAY"); | |
476 | flags &= ~O_NDELAY; | |
477 | #endif | |
478 | ||
479 | if (flags & O_APPEND) | |
480 | printf_filtered (" | O_APPEND"); | |
481 | flags &= ~O_APPEND; | |
482 | ||
483 | #if defined (O_BINARY) | |
484 | if (flags & O_BINARY) | |
485 | printf_filtered (" | O_BINARY"); | |
486 | flags &= ~O_BINARY; | |
487 | #endif | |
488 | ||
489 | if (flags) | |
490 | printf_filtered (" | 0x%x", flags); | |
491 | printf_filtered ("\n"); | |
492 | } | |
493 | ||
494 | #ifdef PROCESS_GROUP_TYPE | |
2acceee2 JM |
495 | printf_filtered ("Process group = %d\n", |
496 | (int) inferior_process_group); | |
c906108c SS |
497 | #endif |
498 | ||
2cd58942 | 499 | serial_print_tty_state (stdin_serial, inferior_ttystate, gdb_stdout); |
c906108c SS |
500 | } |
501 | \f | |
502 | /* NEW_TTY_PREFORK is called before forking a new child process, | |
503 | so we can record the state of ttys in the child to be formed. | |
504 | TTYNAME is null if we are to share the terminal with gdb; | |
505 | or points to a string containing the name of the desired tty. | |
506 | ||
507 | NEW_TTY is called in new child processes under Unix, which will | |
508 | become debugger target processes. This actually switches to | |
509 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
510 | ||
511 | void | |
3cb3b8df | 512 | new_tty_prefork (const char *ttyname) |
c906108c SS |
513 | { |
514 | /* Save the name for later, for determining whether we and the child | |
515 | are sharing a tty. */ | |
516 | inferior_thisrun_terminal = ttyname; | |
517 | } | |
518 | ||
519 | void | |
fba45db2 | 520 | new_tty (void) |
c906108c | 521 | { |
52f0bd74 | 522 | int tty; |
c906108c SS |
523 | |
524 | if (inferior_thisrun_terminal == 0) | |
525 | return; | |
526 | #if !defined(__GO32__) && !defined(_WIN32) | |
527 | #ifdef TIOCNOTTY | |
528 | /* Disconnect the child process from our controlling terminal. On some | |
529 | systems (SVR4 for example), this may cause a SIGTTOU, so temporarily | |
530 | ignore SIGTTOU. */ | |
c5aa993b | 531 | tty = open ("/dev/tty", O_RDWR); |
c906108c SS |
532 | if (tty > 0) |
533 | { | |
534 | void (*osigttou) (); | |
535 | ||
c5aa993b JM |
536 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
537 | ioctl (tty, TIOCNOTTY, 0); | |
538 | close (tty); | |
539 | signal (SIGTTOU, osigttou); | |
c906108c SS |
540 | } |
541 | #endif | |
542 | ||
543 | /* Now open the specified new terminal. */ | |
c5aa993b | 544 | tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
c906108c SS |
545 | if (tty == -1) |
546 | { | |
547 | print_sys_errmsg (inferior_thisrun_terminal, errno); | |
c5aa993b | 548 | _exit (1); |
c906108c SS |
549 | } |
550 | ||
551 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
552 | if (tty != 0) | |
c5aa993b JM |
553 | { |
554 | close (0); | |
555 | dup (tty); | |
556 | } | |
c906108c | 557 | if (tty != 1) |
c5aa993b JM |
558 | { |
559 | close (1); | |
560 | dup (tty); | |
561 | } | |
c906108c | 562 | if (tty != 2) |
c5aa993b JM |
563 | { |
564 | close (2); | |
565 | dup (tty); | |
566 | } | |
83116857 TJB |
567 | |
568 | #ifdef TIOCSCTTY | |
569 | /* Make tty our new controlling terminal. */ | |
570 | if (ioctl (tty, TIOCSCTTY, 0) == -1) | |
571 | /* Mention GDB in warning because it will appear in the inferior's | |
572 | terminal instead of GDB's. */ | |
573 | warning ("GDB: Failed to set controlling terminal: %s", | |
574 | safe_strerror (errno)); | |
575 | #endif | |
576 | ||
c906108c | 577 | if (tty > 2) |
c5aa993b JM |
578 | close (tty); |
579 | #endif /* !go32 && !win32 */ | |
c906108c SS |
580 | } |
581 | \f | |
582 | /* Kill the inferior process. Make us have no inferior. */ | |
583 | ||
c906108c | 584 | static void |
fba45db2 | 585 | kill_command (char *arg, int from_tty) |
c906108c | 586 | { |
39f77062 | 587 | /* FIXME: This should not really be inferior_ptid (or target_has_execution). |
c906108c SS |
588 | It should be a distinct flag that indicates that a target is active, cuz |
589 | some targets don't have processes! */ | |
590 | ||
39f77062 | 591 | if (ptid_equal (inferior_ptid, null_ptid)) |
8a3fe4f8 | 592 | error (_("The program is not being run.")); |
c906108c | 593 | if (!query ("Kill the program being debugged? ")) |
8a3fe4f8 | 594 | error (_("Not confirmed.")); |
c906108c SS |
595 | target_kill (); |
596 | ||
c5aa993b | 597 | init_thread_list (); /* Destroy thread info */ |
c906108c SS |
598 | |
599 | /* Killing off the inferior can leave us with a core file. If so, | |
600 | print the state we are left in. */ | |
c5aa993b JM |
601 | if (target_has_stack) |
602 | { | |
a3f17187 | 603 | printf_filtered (_("In %s,\n"), target_longname); |
206415a3 | 604 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); |
c5aa993b | 605 | } |
ce7d4522 | 606 | bfd_cache_close_all (); |
c906108c SS |
607 | } |
608 | \f | |
609 | /* Call set_sigint_trap when you need to pass a signal on to an attached | |
610 | process when handling SIGINT */ | |
611 | ||
c906108c | 612 | static void |
fba45db2 | 613 | pass_signal (int signo) |
c906108c SS |
614 | { |
615 | #ifndef _WIN32 | |
39f77062 | 616 | kill (PIDGET (inferior_ptid), SIGINT); |
c906108c SS |
617 | #endif |
618 | } | |
619 | ||
c5aa993b | 620 | static void (*osig) (); |
c906108c SS |
621 | |
622 | void | |
fba45db2 | 623 | set_sigint_trap (void) |
c906108c SS |
624 | { |
625 | if (attach_flag || inferior_thisrun_terminal) | |
626 | { | |
c5aa993b | 627 | osig = (void (*)()) signal (SIGINT, pass_signal); |
c906108c SS |
628 | } |
629 | } | |
630 | ||
631 | void | |
fba45db2 | 632 | clear_sigint_trap (void) |
c906108c SS |
633 | { |
634 | if (attach_flag || inferior_thisrun_terminal) | |
635 | { | |
636 | signal (SIGINT, osig); | |
637 | } | |
638 | } | |
639 | \f | |
640 | #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) | |
641 | static void (*old_sigio) (); | |
642 | ||
643 | static void | |
fba45db2 | 644 | handle_sigio (int signo) |
c906108c SS |
645 | { |
646 | int numfds; | |
647 | fd_set readfds; | |
648 | ||
649 | signal (SIGIO, handle_sigio); | |
650 | ||
651 | FD_ZERO (&readfds); | |
652 | FD_SET (target_activity_fd, &readfds); | |
0ea3f30e | 653 | numfds = gdb_select (target_activity_fd + 1, &readfds, NULL, NULL, NULL); |
c906108c SS |
654 | if (numfds >= 0 && FD_ISSET (target_activity_fd, &readfds)) |
655 | { | |
656 | #ifndef _WIN32 | |
657 | if ((*target_activity_function) ()) | |
39f77062 | 658 | kill (PIDGET (inferior_ptid), SIGINT); |
c906108c SS |
659 | #endif |
660 | } | |
661 | } | |
662 | ||
663 | static int old_fcntl_flags; | |
664 | ||
665 | void | |
fba45db2 | 666 | set_sigio_trap (void) |
c906108c SS |
667 | { |
668 | if (target_activity_function) | |
669 | { | |
c5aa993b JM |
670 | old_sigio = (void (*)()) signal (SIGIO, handle_sigio); |
671 | fcntl (target_activity_fd, F_SETOWN, getpid ()); | |
c906108c SS |
672 | old_fcntl_flags = fcntl (target_activity_fd, F_GETFL, 0); |
673 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags | FASYNC); | |
674 | } | |
675 | } | |
676 | ||
677 | void | |
fba45db2 | 678 | clear_sigio_trap (void) |
c906108c SS |
679 | { |
680 | if (target_activity_function) | |
681 | { | |
682 | signal (SIGIO, old_sigio); | |
683 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags); | |
684 | } | |
685 | } | |
686 | #else /* No SIGIO. */ | |
687 | void | |
fba45db2 | 688 | set_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 | ||
694 | void | |
fba45db2 | 695 | clear_sigio_trap (void) |
c906108c SS |
696 | { |
697 | if (target_activity_function) | |
e2e0b3e5 | 698 | internal_error (__FILE__, __LINE__, _("failed internal consistency check")); |
c906108c SS |
699 | } |
700 | #endif /* No SIGIO. */ | |
701 | \f | |
702 | ||
83116857 TJB |
703 | /* Create a new session if the inferior will run in a different tty. |
704 | A session is UNIX's way of grouping processes that share a controlling | |
705 | terminal, so a new one is needed if the inferior terminal will be | |
706 | different from GDB's. | |
707 | ||
708 | Returns the session id of the new session, 0 if no session was created | |
709 | or -1 if an error occurred. */ | |
710 | pid_t | |
711 | create_tty_session (void) | |
712 | { | |
713 | #ifdef HAVE_SETSID | |
714 | pid_t ret; | |
715 | ||
716 | if (!job_control || inferior_thisrun_terminal == 0) | |
717 | return 0; | |
718 | ||
719 | ret = setsid (); | |
720 | if (ret == -1) | |
721 | warning ("Failed to create new terminal session: setsid: %s", | |
722 | safe_strerror (errno)); | |
723 | ||
724 | return ret; | |
725 | #else | |
726 | return 0; | |
727 | #endif /* HAVE_SETSID */ | |
728 | } | |
729 | ||
c906108c SS |
730 | /* This is here because this is where we figure out whether we (probably) |
731 | have job control. Just using job_control only does part of it because | |
732 | setpgid or setpgrp might not exist on a system without job control. | |
733 | It might be considered misplaced (on the other hand, process groups and | |
734 | job control are closely related to ttys). | |
735 | ||
736 | For a more clean implementation, in libiberty, put a setpgid which merely | |
737 | calls setpgrp and a setpgrp which does nothing (any system with job control | |
738 | will have one or the other). */ | |
739 | int | |
fba45db2 | 740 | gdb_setpgid (void) |
c906108c SS |
741 | { |
742 | int retval = 0; | |
743 | ||
744 | if (job_control) | |
745 | { | |
0200359f MK |
746 | #if defined (HAVE_TERMIOS) || defined (TIOCGPGRP) |
747 | #ifdef HAVE_SETPGID | |
748 | /* The call setpgid (0, 0) is supposed to work and mean the same | |
749 | thing as this, but on Ultrix 4.2A it fails with EPERM (and | |
c5aa993b | 750 | setpgid (getpid (), getpid ()) succeeds). */ |
c906108c SS |
751 | retval = setpgid (getpid (), getpid ()); |
752 | #else | |
0200359f MK |
753 | #ifdef HAVE_SETPGRP |
754 | #ifdef SETPGRP_VOID | |
c906108c SS |
755 | retval = setpgrp (); |
756 | #else | |
757 | retval = setpgrp (getpid (), getpid ()); | |
0200359f MK |
758 | #endif |
759 | #endif /* HAVE_SETPGRP */ | |
760 | #endif /* HAVE_SETPGID */ | |
761 | #endif /* defined (HAVE_TERMIOS) || defined (TIOCGPGRP) */ | |
c906108c | 762 | } |
0200359f | 763 | |
c906108c SS |
764 | return retval; |
765 | } | |
766 | ||
0ea3f30e DJ |
767 | /* Get all the current tty settings (including whether we have a |
768 | tty at all!). We can't do this in _initialize_inflow because | |
769 | serial_fdopen() won't work until the serial_ops_list is | |
770 | initialized, but we don't want to do it lazily either, so | |
771 | that we can guarantee stdin_serial is opened if there is | |
772 | a terminal. */ | |
773 | void | |
774 | initialize_stdin_serial (void) | |
775 | { | |
776 | stdin_serial = serial_fdopen (0); | |
777 | } | |
778 | ||
c906108c | 779 | void |
fba45db2 | 780 | _initialize_inflow (void) |
c906108c SS |
781 | { |
782 | add_info ("terminal", term_info, | |
1bedd215 | 783 | _("Print inferior's saved terminal status.")); |
c906108c SS |
784 | |
785 | add_com ("kill", class_run, kill_command, | |
1bedd215 | 786 | _("Kill execution of program being debugged.")); |
c906108c | 787 | |
39f77062 | 788 | inferior_ptid = null_ptid; |
c906108c SS |
789 | |
790 | terminal_is_ours = 1; | |
791 | ||
792 | /* OK, figure out whether we have job control. If neither termios nor | |
793 | sgtty (i.e. termio or go32), leave job_control 0. */ | |
794 | ||
795 | #if defined (HAVE_TERMIOS) | |
796 | /* Do all systems with termios have the POSIX way of identifying job | |
797 | control? I hope so. */ | |
798 | #ifdef _POSIX_JOB_CONTROL | |
799 | job_control = 1; | |
800 | #else | |
801 | #ifdef _SC_JOB_CONTROL | |
802 | job_control = sysconf (_SC_JOB_CONTROL); | |
803 | #else | |
c5aa993b JM |
804 | job_control = 0; /* have to assume the worst */ |
805 | #endif /* _SC_JOB_CONTROL */ | |
806 | #endif /* _POSIX_JOB_CONTROL */ | |
807 | #endif /* HAVE_TERMIOS */ | |
c906108c SS |
808 | |
809 | #ifdef HAVE_SGTTY | |
810 | #ifdef TIOCGPGRP | |
811 | job_control = 1; | |
812 | #else | |
813 | job_control = 0; | |
814 | #endif /* TIOCGPGRP */ | |
815 | #endif /* sgtty */ | |
816 | } |