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 | 352 | |
49a834f9 | 353 | #ifdef PROCESS_GROUP_TYPE |
64a0ac84 PA |
354 | if (!attach_flag) |
355 | /* If setpgrp failed in terminal_inferior, this would give us | |
356 | our process group instead of the inferior's. See | |
357 | terminal_inferior for details. */ | |
358 | inferior_process_group = gdb_getpgrp (); | |
49a834f9 | 359 | #endif |
c906108c SS |
360 | |
361 | /* Here we used to set ICANON in our ttystate, but I believe this | |
c5aa993b JM |
362 | was an artifact from before when we used readline. Readline sets |
363 | the tty state when it needs to. | |
364 | FIXME-maybe: However, query() expects non-raw mode and doesn't | |
365 | use readline. Maybe query should use readline (on the other hand, | |
366 | this only matters for HAVE_SGTTY, not termio or termios, I think). */ | |
c906108c SS |
367 | |
368 | /* Set tty state to our_ttystate. We don't change in our out of raw | |
c5aa993b JM |
369 | mode, to avoid flushing input. We need to do the same thing |
370 | regardless of output_only, because we don't have separate | |
371 | terminal_is_ours and terminal_is_ours_for_output flags. It's OK, | |
372 | though, since readline will deal with raw mode when/if it needs to. | |
373 | */ | |
c906108c | 374 | |
2cd58942 | 375 | serial_noflush_set_tty_state (stdin_serial, our_ttystate, |
c906108c SS |
376 | inferior_ttystate); |
377 | ||
378 | if (job_control) | |
379 | { | |
380 | #ifdef HAVE_TERMIOS | |
381 | result = tcsetpgrp (0, our_process_group); | |
382 | #if 0 | |
383 | /* This fails on Ultrix with EINVAL if you run the testsuite | |
384 | in the background with nohup, and then log out. GDB never | |
385 | used to check for an error here, so perhaps there are other | |
386 | such situations as well. */ | |
387 | if (result == -1) | |
388 | fprintf_unfiltered (gdb_stderr, "[tcsetpgrp failed in terminal_ours: %s]\n", | |
dc672865 | 389 | safe_strerror (errno)); |
c906108c SS |
390 | #endif |
391 | #endif /* termios */ | |
392 | ||
393 | #ifdef HAVE_SGTTY | |
394 | result = ioctl (0, TIOCSPGRP, &our_process_group); | |
395 | #endif | |
396 | } | |
397 | ||
398 | #ifdef SIGTTOU | |
399 | if (job_control) | |
400 | signal (SIGTTOU, osigttou); | |
401 | #endif | |
402 | ||
403 | if (!job_control) | |
404 | { | |
405 | signal (SIGINT, sigint_ours); | |
406 | #ifdef SIGQUIT | |
407 | signal (SIGQUIT, sigquit_ours); | |
408 | #endif | |
409 | } | |
410 | ||
411 | #ifdef F_GETFL | |
412 | tflags_inferior = fcntl (0, F_GETFL, 0); | |
413 | ||
414 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
415 | places we use F_SETFL, so I'm inclined to think perhaps there |
416 | is some reason, however perverse. Perhaps not though... */ | |
c906108c SS |
417 | result = fcntl (0, F_SETFL, tflags_ours); |
418 | result = fcntl (0, F_SETFL, tflags_ours); | |
419 | #endif | |
c906108c SS |
420 | } |
421 | } | |
422 | ||
c906108c | 423 | void |
fba45db2 | 424 | term_info (char *arg, int from_tty) |
c906108c SS |
425 | { |
426 | target_terminal_info (arg, from_tty); | |
427 | } | |
428 | ||
c906108c | 429 | void |
fba45db2 | 430 | child_terminal_info (char *args, int from_tty) |
c906108c SS |
431 | { |
432 | if (!gdb_has_a_terminal ()) | |
433 | { | |
a3f17187 | 434 | printf_filtered (_("This GDB does not control a terminal.\n")); |
c906108c SS |
435 | return; |
436 | } | |
437 | ||
a3f17187 | 438 | printf_filtered (_("Inferior's terminal status (currently saved by GDB):\n")); |
c906108c SS |
439 | |
440 | /* First the fcntl flags. */ | |
441 | { | |
442 | int flags; | |
c5aa993b | 443 | |
c906108c SS |
444 | flags = tflags_inferior; |
445 | ||
446 | printf_filtered ("File descriptor flags = "); | |
447 | ||
448 | #ifndef O_ACCMODE | |
449 | #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) | |
450 | #endif | |
451 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug */ | |
452 | switch (flags & (O_ACCMODE)) | |
453 | { | |
c5aa993b JM |
454 | case O_RDONLY: |
455 | printf_filtered ("O_RDONLY"); | |
456 | break; | |
457 | case O_WRONLY: | |
458 | printf_filtered ("O_WRONLY"); | |
459 | break; | |
460 | case O_RDWR: | |
461 | printf_filtered ("O_RDWR"); | |
462 | break; | |
c906108c SS |
463 | } |
464 | flags &= ~(O_ACCMODE); | |
465 | ||
466 | #ifdef O_NONBLOCK | |
c5aa993b | 467 | if (flags & O_NONBLOCK) |
c906108c SS |
468 | printf_filtered (" | O_NONBLOCK"); |
469 | flags &= ~O_NONBLOCK; | |
470 | #endif | |
c5aa993b | 471 | |
c906108c SS |
472 | #if defined (O_NDELAY) |
473 | /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will | |
474 | print it as O_NONBLOCK, which is good cause that is what POSIX | |
475 | has, and the flag will already be cleared by the time we get here. */ | |
476 | if (flags & O_NDELAY) | |
477 | printf_filtered (" | O_NDELAY"); | |
478 | flags &= ~O_NDELAY; | |
479 | #endif | |
480 | ||
481 | if (flags & O_APPEND) | |
482 | printf_filtered (" | O_APPEND"); | |
483 | flags &= ~O_APPEND; | |
484 | ||
485 | #if defined (O_BINARY) | |
486 | if (flags & O_BINARY) | |
487 | printf_filtered (" | O_BINARY"); | |
488 | flags &= ~O_BINARY; | |
489 | #endif | |
490 | ||
491 | if (flags) | |
492 | printf_filtered (" | 0x%x", flags); | |
493 | printf_filtered ("\n"); | |
494 | } | |
495 | ||
496 | #ifdef PROCESS_GROUP_TYPE | |
2acceee2 JM |
497 | printf_filtered ("Process group = %d\n", |
498 | (int) inferior_process_group); | |
c906108c SS |
499 | #endif |
500 | ||
2cd58942 | 501 | serial_print_tty_state (stdin_serial, inferior_ttystate, gdb_stdout); |
c906108c SS |
502 | } |
503 | \f | |
504 | /* NEW_TTY_PREFORK is called before forking a new child process, | |
505 | so we can record the state of ttys in the child to be formed. | |
506 | TTYNAME is null if we are to share the terminal with gdb; | |
507 | or points to a string containing the name of the desired tty. | |
508 | ||
509 | NEW_TTY is called in new child processes under Unix, which will | |
510 | become debugger target processes. This actually switches to | |
511 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
512 | ||
513 | void | |
3cb3b8df | 514 | new_tty_prefork (const char *ttyname) |
c906108c SS |
515 | { |
516 | /* Save the name for later, for determining whether we and the child | |
517 | are sharing a tty. */ | |
518 | inferior_thisrun_terminal = ttyname; | |
519 | } | |
520 | ||
521 | void | |
fba45db2 | 522 | new_tty (void) |
c906108c | 523 | { |
52f0bd74 | 524 | int tty; |
c906108c SS |
525 | |
526 | if (inferior_thisrun_terminal == 0) | |
527 | return; | |
528 | #if !defined(__GO32__) && !defined(_WIN32) | |
529 | #ifdef TIOCNOTTY | |
530 | /* Disconnect the child process from our controlling terminal. On some | |
531 | systems (SVR4 for example), this may cause a SIGTTOU, so temporarily | |
532 | ignore SIGTTOU. */ | |
c5aa993b | 533 | tty = open ("/dev/tty", O_RDWR); |
c906108c SS |
534 | if (tty > 0) |
535 | { | |
536 | void (*osigttou) (); | |
537 | ||
c5aa993b JM |
538 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
539 | ioctl (tty, TIOCNOTTY, 0); | |
540 | close (tty); | |
541 | signal (SIGTTOU, osigttou); | |
c906108c SS |
542 | } |
543 | #endif | |
544 | ||
545 | /* Now open the specified new terminal. */ | |
c5aa993b | 546 | tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
c906108c SS |
547 | if (tty == -1) |
548 | { | |
549 | print_sys_errmsg (inferior_thisrun_terminal, errno); | |
c5aa993b | 550 | _exit (1); |
c906108c SS |
551 | } |
552 | ||
553 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
554 | if (tty != 0) | |
c5aa993b JM |
555 | { |
556 | close (0); | |
557 | dup (tty); | |
558 | } | |
c906108c | 559 | if (tty != 1) |
c5aa993b JM |
560 | { |
561 | close (1); | |
562 | dup (tty); | |
563 | } | |
c906108c | 564 | if (tty != 2) |
c5aa993b JM |
565 | { |
566 | close (2); | |
567 | dup (tty); | |
568 | } | |
83116857 TJB |
569 | |
570 | #ifdef TIOCSCTTY | |
571 | /* Make tty our new controlling terminal. */ | |
572 | if (ioctl (tty, TIOCSCTTY, 0) == -1) | |
573 | /* Mention GDB in warning because it will appear in the inferior's | |
574 | terminal instead of GDB's. */ | |
575 | warning ("GDB: Failed to set controlling terminal: %s", | |
576 | safe_strerror (errno)); | |
577 | #endif | |
578 | ||
c906108c | 579 | if (tty > 2) |
c5aa993b JM |
580 | close (tty); |
581 | #endif /* !go32 && !win32 */ | |
c906108c SS |
582 | } |
583 | \f | |
584 | /* Kill the inferior process. Make us have no inferior. */ | |
585 | ||
c906108c | 586 | static void |
fba45db2 | 587 | kill_command (char *arg, int from_tty) |
c906108c | 588 | { |
39f77062 | 589 | /* FIXME: This should not really be inferior_ptid (or target_has_execution). |
c906108c SS |
590 | It should be a distinct flag that indicates that a target is active, cuz |
591 | some targets don't have processes! */ | |
592 | ||
39f77062 | 593 | if (ptid_equal (inferior_ptid, null_ptid)) |
8a3fe4f8 | 594 | error (_("The program is not being run.")); |
c906108c | 595 | if (!query ("Kill the program being debugged? ")) |
8a3fe4f8 | 596 | error (_("Not confirmed.")); |
c906108c SS |
597 | target_kill (); |
598 | ||
c5aa993b | 599 | init_thread_list (); /* Destroy thread info */ |
c906108c SS |
600 | |
601 | /* Killing off the inferior can leave us with a core file. If so, | |
602 | print the state we are left in. */ | |
c5aa993b JM |
603 | if (target_has_stack) |
604 | { | |
a3f17187 | 605 | printf_filtered (_("In %s,\n"), target_longname); |
206415a3 | 606 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); |
c5aa993b | 607 | } |
ce7d4522 | 608 | bfd_cache_close_all (); |
c906108c SS |
609 | } |
610 | \f | |
611 | /* Call set_sigint_trap when you need to pass a signal on to an attached | |
612 | process when handling SIGINT */ | |
613 | ||
c906108c | 614 | static void |
fba45db2 | 615 | pass_signal (int signo) |
c906108c SS |
616 | { |
617 | #ifndef _WIN32 | |
39f77062 | 618 | kill (PIDGET (inferior_ptid), SIGINT); |
c906108c SS |
619 | #endif |
620 | } | |
621 | ||
c5aa993b | 622 | static void (*osig) (); |
c906108c SS |
623 | |
624 | void | |
fba45db2 | 625 | set_sigint_trap (void) |
c906108c SS |
626 | { |
627 | if (attach_flag || inferior_thisrun_terminal) | |
628 | { | |
c5aa993b | 629 | osig = (void (*)()) signal (SIGINT, pass_signal); |
c906108c SS |
630 | } |
631 | } | |
632 | ||
633 | void | |
fba45db2 | 634 | clear_sigint_trap (void) |
c906108c SS |
635 | { |
636 | if (attach_flag || inferior_thisrun_terminal) | |
637 | { | |
638 | signal (SIGINT, osig); | |
639 | } | |
640 | } | |
641 | \f | |
642 | #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) | |
643 | static void (*old_sigio) (); | |
644 | ||
645 | static void | |
fba45db2 | 646 | handle_sigio (int signo) |
c906108c SS |
647 | { |
648 | int numfds; | |
649 | fd_set readfds; | |
650 | ||
651 | signal (SIGIO, handle_sigio); | |
652 | ||
653 | FD_ZERO (&readfds); | |
654 | FD_SET (target_activity_fd, &readfds); | |
0ea3f30e | 655 | numfds = gdb_select (target_activity_fd + 1, &readfds, NULL, NULL, NULL); |
c906108c SS |
656 | if (numfds >= 0 && FD_ISSET (target_activity_fd, &readfds)) |
657 | { | |
658 | #ifndef _WIN32 | |
659 | if ((*target_activity_function) ()) | |
39f77062 | 660 | kill (PIDGET (inferior_ptid), SIGINT); |
c906108c SS |
661 | #endif |
662 | } | |
663 | } | |
664 | ||
665 | static int old_fcntl_flags; | |
666 | ||
667 | void | |
fba45db2 | 668 | set_sigio_trap (void) |
c906108c SS |
669 | { |
670 | if (target_activity_function) | |
671 | { | |
c5aa993b JM |
672 | old_sigio = (void (*)()) signal (SIGIO, handle_sigio); |
673 | fcntl (target_activity_fd, F_SETOWN, getpid ()); | |
c906108c SS |
674 | old_fcntl_flags = fcntl (target_activity_fd, F_GETFL, 0); |
675 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags | FASYNC); | |
676 | } | |
677 | } | |
678 | ||
679 | void | |
fba45db2 | 680 | clear_sigio_trap (void) |
c906108c SS |
681 | { |
682 | if (target_activity_function) | |
683 | { | |
684 | signal (SIGIO, old_sigio); | |
685 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags); | |
686 | } | |
687 | } | |
688 | #else /* No SIGIO. */ | |
689 | void | |
fba45db2 | 690 | set_sigio_trap (void) |
c906108c SS |
691 | { |
692 | if (target_activity_function) | |
e2e0b3e5 | 693 | internal_error (__FILE__, __LINE__, _("failed internal consistency check")); |
c906108c SS |
694 | } |
695 | ||
696 | void | |
fba45db2 | 697 | clear_sigio_trap (void) |
c906108c SS |
698 | { |
699 | if (target_activity_function) | |
e2e0b3e5 | 700 | internal_error (__FILE__, __LINE__, _("failed internal consistency check")); |
c906108c SS |
701 | } |
702 | #endif /* No SIGIO. */ | |
703 | \f | |
704 | ||
83116857 TJB |
705 | /* Create a new session if the inferior will run in a different tty. |
706 | A session is UNIX's way of grouping processes that share a controlling | |
707 | terminal, so a new one is needed if the inferior terminal will be | |
708 | different from GDB's. | |
709 | ||
710 | Returns the session id of the new session, 0 if no session was created | |
711 | or -1 if an error occurred. */ | |
712 | pid_t | |
713 | create_tty_session (void) | |
714 | { | |
715 | #ifdef HAVE_SETSID | |
716 | pid_t ret; | |
717 | ||
718 | if (!job_control || inferior_thisrun_terminal == 0) | |
719 | return 0; | |
720 | ||
721 | ret = setsid (); | |
722 | if (ret == -1) | |
723 | warning ("Failed to create new terminal session: setsid: %s", | |
724 | safe_strerror (errno)); | |
725 | ||
726 | return ret; | |
727 | #else | |
728 | return 0; | |
729 | #endif /* HAVE_SETSID */ | |
730 | } | |
731 | ||
c906108c SS |
732 | /* This is here because this is where we figure out whether we (probably) |
733 | have job control. Just using job_control only does part of it because | |
734 | setpgid or setpgrp might not exist on a system without job control. | |
735 | It might be considered misplaced (on the other hand, process groups and | |
736 | job control are closely related to ttys). | |
737 | ||
738 | For a more clean implementation, in libiberty, put a setpgid which merely | |
739 | calls setpgrp and a setpgrp which does nothing (any system with job control | |
740 | will have one or the other). */ | |
741 | int | |
fba45db2 | 742 | gdb_setpgid (void) |
c906108c SS |
743 | { |
744 | int retval = 0; | |
745 | ||
746 | if (job_control) | |
747 | { | |
0200359f MK |
748 | #if defined (HAVE_TERMIOS) || defined (TIOCGPGRP) |
749 | #ifdef HAVE_SETPGID | |
750 | /* The call setpgid (0, 0) is supposed to work and mean the same | |
751 | thing as this, but on Ultrix 4.2A it fails with EPERM (and | |
c5aa993b | 752 | setpgid (getpid (), getpid ()) succeeds). */ |
c906108c SS |
753 | retval = setpgid (getpid (), getpid ()); |
754 | #else | |
0200359f MK |
755 | #ifdef HAVE_SETPGRP |
756 | #ifdef SETPGRP_VOID | |
c906108c SS |
757 | retval = setpgrp (); |
758 | #else | |
759 | retval = setpgrp (getpid (), getpid ()); | |
0200359f MK |
760 | #endif |
761 | #endif /* HAVE_SETPGRP */ | |
762 | #endif /* HAVE_SETPGID */ | |
763 | #endif /* defined (HAVE_TERMIOS) || defined (TIOCGPGRP) */ | |
c906108c | 764 | } |
0200359f | 765 | |
c906108c SS |
766 | return retval; |
767 | } | |
768 | ||
0ea3f30e DJ |
769 | /* Get all the current tty settings (including whether we have a |
770 | tty at all!). We can't do this in _initialize_inflow because | |
771 | serial_fdopen() won't work until the serial_ops_list is | |
772 | initialized, but we don't want to do it lazily either, so | |
773 | that we can guarantee stdin_serial is opened if there is | |
774 | a terminal. */ | |
775 | void | |
776 | initialize_stdin_serial (void) | |
777 | { | |
778 | stdin_serial = serial_fdopen (0); | |
779 | } | |
780 | ||
c906108c | 781 | void |
fba45db2 | 782 | _initialize_inflow (void) |
c906108c SS |
783 | { |
784 | add_info ("terminal", term_info, | |
1bedd215 | 785 | _("Print inferior's saved terminal status.")); |
c906108c SS |
786 | |
787 | add_com ("kill", class_run, kill_command, | |
1bedd215 | 788 | _("Kill execution of program being debugged.")); |
c906108c | 789 | |
39f77062 | 790 | inferior_ptid = null_ptid; |
c906108c SS |
791 | |
792 | terminal_is_ours = 1; | |
793 | ||
794 | /* OK, figure out whether we have job control. If neither termios nor | |
795 | sgtty (i.e. termio or go32), leave job_control 0. */ | |
796 | ||
797 | #if defined (HAVE_TERMIOS) | |
798 | /* Do all systems with termios have the POSIX way of identifying job | |
799 | control? I hope so. */ | |
800 | #ifdef _POSIX_JOB_CONTROL | |
801 | job_control = 1; | |
802 | #else | |
803 | #ifdef _SC_JOB_CONTROL | |
804 | job_control = sysconf (_SC_JOB_CONTROL); | |
805 | #else | |
c5aa993b JM |
806 | job_control = 0; /* have to assume the worst */ |
807 | #endif /* _SC_JOB_CONTROL */ | |
808 | #endif /* _POSIX_JOB_CONTROL */ | |
809 | #endif /* HAVE_TERMIOS */ | |
c906108c SS |
810 | |
811 | #ifdef HAVE_SGTTY | |
812 | #ifdef TIOCGPGRP | |
813 | job_control = 1; | |
814 | #else | |
815 | job_control = 0; | |
816 | #endif /* TIOCGPGRP */ | |
817 | #endif /* sgtty */ | |
818 | } |