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c906108c SS |
1 | /* Low level interface to ptrace, for GDB when running under Unix. |
2 | Copyright 1986-87, 1989, 1991-92, 1995, 1998 Free Software Foundation, Inc. | |
3 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
c906108c | 10 | |
c5aa993b JM |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
c906108c | 15 | |
c5aa993b JM |
16 | You should have received a copy of the GNU General Public License |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include "frame.h" | |
23 | #include "inferior.h" | |
24 | #include "command.h" | |
25 | #include "signals.h" | |
26 | #include "serial.h" | |
27 | #include "terminal.h" | |
28 | #include "target.h" | |
29 | #include "gdbthread.h" | |
30 | ||
31 | #include "gdb_string.h" | |
32 | #include <signal.h> | |
33 | #include <fcntl.h> | |
34 | #ifdef HAVE_UNISTD_H | |
35 | #include <unistd.h> | |
36 | #endif | |
7a292a7a SS |
37 | #ifdef HAVE_SYS_SELECT_H |
38 | #include <sys/select.h> | |
39 | #endif | |
c906108c SS |
40 | |
41 | #ifdef HAVE_TERMIOS | |
42 | #define PROCESS_GROUP_TYPE pid_t | |
43 | #endif | |
44 | ||
45 | #ifdef HAVE_TERMIO | |
46 | #define PROCESS_GROUP_TYPE int | |
47 | #endif | |
48 | ||
49 | #ifdef HAVE_SGTTY | |
50 | #ifdef SHORT_PGRP | |
51 | /* This is only used for the ultra. Does it have pid_t? */ | |
52 | #define PROCESS_GROUP_TYPE short | |
53 | #else | |
54 | #define PROCESS_GROUP_TYPE int | |
55 | #endif | |
56 | #endif /* sgtty */ | |
57 | ||
58 | #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) | |
59 | static void | |
60 | handle_sigio PARAMS ((int)); | |
61 | #endif | |
62 | ||
392a587b JM |
63 | extern void _initialize_inflow PARAMS ((void)); |
64 | ||
c906108c SS |
65 | static void |
66 | pass_signal PARAMS ((int)); | |
67 | ||
68 | static void | |
69 | kill_command PARAMS ((char *, int)); | |
70 | ||
71 | static void | |
72 | terminal_ours_1 PARAMS ((int)); | |
73 | \f | |
74 | /* Record terminal status separately for debugger and inferior. */ | |
75 | ||
76 | static serial_t stdin_serial; | |
77 | ||
78 | /* TTY state for the inferior. We save it whenever the inferior stops, and | |
79 | restore it when it resumes. */ | |
80 | static serial_ttystate inferior_ttystate; | |
81 | ||
82 | /* Our own tty state, which we restore every time we need to deal with the | |
83 | terminal. We only set it once, when GDB first starts. The settings of | |
84 | flags which readline saves and restores and unimportant. */ | |
85 | static serial_ttystate our_ttystate; | |
86 | ||
87 | /* fcntl flags for us and the inferior. Saved and restored just like | |
88 | {our,inferior}_ttystate. */ | |
89 | static int tflags_inferior; | |
90 | static int tflags_ours; | |
91 | ||
92 | #ifdef PROCESS_GROUP_TYPE | |
93 | /* Process group for us and the inferior. Saved and restored just like | |
94 | {our,inferior}_ttystate. */ | |
95 | PROCESS_GROUP_TYPE our_process_group; | |
96 | PROCESS_GROUP_TYPE inferior_process_group; | |
97 | #endif | |
98 | ||
99 | /* While the inferior is running, we want SIGINT and SIGQUIT to go to the | |
100 | inferior only. If we have job control, that takes care of it. If not, | |
101 | we save our handlers in these two variables and set SIGINT and SIGQUIT | |
102 | to SIG_IGN. */ | |
103 | ||
104 | static void (*sigint_ours) (); | |
105 | static void (*sigquit_ours) (); | |
106 | ||
107 | /* The name of the tty (from the `tty' command) that we gave to the inferior | |
108 | when it was last started. */ | |
109 | ||
110 | static char *inferior_thisrun_terminal; | |
111 | ||
112 | /* Nonzero if our terminal settings are in effect. Zero if the | |
113 | inferior's settings are in effect. Ignored if !gdb_has_a_terminal | |
114 | (). */ | |
115 | ||
116 | int terminal_is_ours; | |
117 | ||
c5aa993b JM |
118 | enum |
119 | { | |
120 | yes, no, have_not_checked | |
121 | } | |
122 | gdb_has_a_terminal_flag = have_not_checked; | |
c906108c SS |
123 | |
124 | /* Does GDB have a terminal (on stdin)? */ | |
125 | int | |
126 | gdb_has_a_terminal () | |
127 | { | |
128 | switch (gdb_has_a_terminal_flag) | |
129 | { | |
130 | case yes: | |
131 | return 1; | |
132 | case no: | |
133 | return 0; | |
134 | case have_not_checked: | |
135 | /* Get all the current tty settings (including whether we have a tty at | |
c5aa993b JM |
136 | all!). Can't do this in _initialize_inflow because SERIAL_FDOPEN |
137 | won't work until the serial_ops_list is initialized. */ | |
c906108c SS |
138 | |
139 | #ifdef F_GETFL | |
140 | tflags_ours = fcntl (0, F_GETFL, 0); | |
141 | #endif | |
142 | ||
143 | gdb_has_a_terminal_flag = no; | |
144 | stdin_serial = SERIAL_FDOPEN (0); | |
145 | if (stdin_serial != NULL) | |
146 | { | |
147 | our_ttystate = SERIAL_GET_TTY_STATE (stdin_serial); | |
148 | ||
149 | if (our_ttystate != NULL) | |
150 | { | |
151 | gdb_has_a_terminal_flag = yes; | |
152 | #ifdef HAVE_TERMIOS | |
153 | our_process_group = tcgetpgrp (0); | |
154 | #endif | |
155 | #ifdef HAVE_TERMIO | |
156 | our_process_group = getpgrp (); | |
157 | #endif | |
158 | #ifdef HAVE_SGTTY | |
159 | ioctl (0, TIOCGPGRP, &our_process_group); | |
160 | #endif | |
161 | } | |
162 | } | |
163 | ||
164 | return gdb_has_a_terminal_flag == yes; | |
165 | default: | |
166 | /* "Can't happen". */ | |
167 | return 0; | |
168 | } | |
169 | } | |
170 | ||
171 | /* Macro for printing errors from ioctl operations */ | |
172 | ||
173 | #define OOPSY(what) \ | |
174 | if (result == -1) \ | |
175 | fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ | |
176 | what, strerror (errno)) | |
177 | ||
178 | static void terminal_ours_1 PARAMS ((int)); | |
179 | ||
180 | /* Initialize the terminal settings we record for the inferior, | |
181 | before we actually run the inferior. */ | |
182 | ||
183 | void | |
184 | terminal_init_inferior_with_pgrp (pgrp) | |
185 | int pgrp; | |
186 | { | |
187 | if (gdb_has_a_terminal ()) | |
188 | { | |
189 | /* We could just as well copy our_ttystate (if we felt like adding | |
c5aa993b | 190 | a new function SERIAL_COPY_TTY_STATE). */ |
c906108c SS |
191 | if (inferior_ttystate) |
192 | free (inferior_ttystate); | |
193 | inferior_ttystate = SERIAL_GET_TTY_STATE (stdin_serial); | |
194 | ||
195 | #ifdef PROCESS_GROUP_TYPE | |
196 | inferior_process_group = pgrp; | |
197 | #endif | |
198 | ||
199 | /* Make sure that next time we call terminal_inferior (which will be | |
c5aa993b JM |
200 | before the program runs, as it needs to be), we install the new |
201 | process group. */ | |
c906108c SS |
202 | terminal_is_ours = 1; |
203 | } | |
204 | } | |
205 | ||
206 | void | |
207 | terminal_init_inferior () | |
208 | { | |
209 | #ifdef PROCESS_GROUP_TYPE | |
210 | /* This is for Lynx, and should be cleaned up by having Lynx be a separate | |
211 | debugging target with a version of target_terminal_init_inferior which | |
212 | passes in the process group to a generic routine which does all the work | |
213 | (and the non-threaded child_terminal_init_inferior can just pass in | |
214 | inferior_pid to the same routine). */ | |
215 | /* We assume INFERIOR_PID is also the child's process group. */ | |
216 | terminal_init_inferior_with_pgrp (PIDGET (inferior_pid)); | |
217 | #endif /* PROCESS_GROUP_TYPE */ | |
218 | } | |
219 | ||
220 | /* Put the inferior's terminal settings into effect. | |
221 | This is preparation for starting or resuming the inferior. */ | |
222 | ||
223 | void | |
224 | terminal_inferior () | |
225 | { | |
226 | if (gdb_has_a_terminal () && terminal_is_ours | |
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. */ | |
c906108c SS |
243 | result = SERIAL_SET_TTY_STATE (stdin_serial, inferior_ttystate); |
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 | |
294 | terminal_ours_for_output () | |
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 | |
304 | terminal_ours () | |
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 | |
314 | terminal_ours_1 (output_only) | |
315 | int output_only; | |
316 | { | |
317 | /* Checking inferior_thisrun_terminal is necessary so that | |
318 | if GDB is running in the background, it won't block trying | |
319 | to do the ioctl()'s below. Checking gdb_has_a_terminal | |
320 | avoids attempting all the ioctl's when running in batch. */ | |
321 | if (inferior_thisrun_terminal != 0 || gdb_has_a_terminal () == 0) | |
322 | return; | |
323 | ||
324 | if (!terminal_is_ours) | |
325 | { | |
326 | /* Ignore this signal since it will happen when we try to set the | |
c5aa993b | 327 | pgrp. */ |
c906108c SS |
328 | void (*osigttou) (); |
329 | int result; | |
330 | ||
331 | terminal_is_ours = 1; | |
332 | ||
333 | #ifdef SIGTTOU | |
334 | if (job_control) | |
c5aa993b | 335 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
c906108c SS |
336 | #endif |
337 | ||
338 | if (inferior_ttystate) | |
339 | free (inferior_ttystate); | |
340 | inferior_ttystate = SERIAL_GET_TTY_STATE (stdin_serial); | |
341 | #ifdef HAVE_TERMIOS | |
342 | inferior_process_group = tcgetpgrp (0); | |
343 | #endif | |
344 | #ifdef HAVE_TERMIO | |
345 | inferior_process_group = getpgrp (); | |
346 | #endif | |
347 | #ifdef HAVE_SGTTY | |
348 | ioctl (0, TIOCGPGRP, &inferior_process_group); | |
349 | #endif | |
350 | ||
351 | /* Here we used to set ICANON in our ttystate, but I believe this | |
c5aa993b JM |
352 | was an artifact from before when we used readline. Readline sets |
353 | the tty state when it needs to. | |
354 | FIXME-maybe: However, query() expects non-raw mode and doesn't | |
355 | use readline. Maybe query should use readline (on the other hand, | |
356 | this only matters for HAVE_SGTTY, not termio or termios, I think). */ | |
c906108c SS |
357 | |
358 | /* Set tty state to our_ttystate. We don't change in our out of raw | |
c5aa993b JM |
359 | mode, to avoid flushing input. We need to do the same thing |
360 | regardless of output_only, because we don't have separate | |
361 | terminal_is_ours and terminal_is_ours_for_output flags. It's OK, | |
362 | though, since readline will deal with raw mode when/if it needs to. | |
363 | */ | |
c906108c SS |
364 | |
365 | SERIAL_NOFLUSH_SET_TTY_STATE (stdin_serial, our_ttystate, | |
366 | inferior_ttystate); | |
367 | ||
368 | if (job_control) | |
369 | { | |
370 | #ifdef HAVE_TERMIOS | |
371 | result = tcsetpgrp (0, our_process_group); | |
372 | #if 0 | |
373 | /* This fails on Ultrix with EINVAL if you run the testsuite | |
374 | in the background with nohup, and then log out. GDB never | |
375 | used to check for an error here, so perhaps there are other | |
376 | such situations as well. */ | |
377 | if (result == -1) | |
378 | fprintf_unfiltered (gdb_stderr, "[tcsetpgrp failed in terminal_ours: %s]\n", | |
c5aa993b | 379 | strerror (errno)); |
c906108c SS |
380 | #endif |
381 | #endif /* termios */ | |
382 | ||
383 | #ifdef HAVE_SGTTY | |
384 | result = ioctl (0, TIOCSPGRP, &our_process_group); | |
385 | #endif | |
386 | } | |
387 | ||
388 | #ifdef SIGTTOU | |
389 | if (job_control) | |
390 | signal (SIGTTOU, osigttou); | |
391 | #endif | |
392 | ||
393 | if (!job_control) | |
394 | { | |
395 | signal (SIGINT, sigint_ours); | |
396 | #ifdef SIGQUIT | |
397 | signal (SIGQUIT, sigquit_ours); | |
398 | #endif | |
399 | } | |
400 | ||
401 | #ifdef F_GETFL | |
402 | tflags_inferior = fcntl (0, F_GETFL, 0); | |
403 | ||
404 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
405 | places we use F_SETFL, so I'm inclined to think perhaps there |
406 | is some reason, however perverse. Perhaps not though... */ | |
c906108c SS |
407 | result = fcntl (0, F_SETFL, tflags_ours); |
408 | result = fcntl (0, F_SETFL, tflags_ours); | |
409 | #endif | |
410 | ||
c5aa993b | 411 | result = result; /* lint */ |
c906108c SS |
412 | } |
413 | } | |
414 | ||
415 | /* ARGSUSED */ | |
416 | void | |
417 | term_info (arg, from_tty) | |
418 | char *arg; | |
419 | int from_tty; | |
420 | { | |
421 | target_terminal_info (arg, from_tty); | |
422 | } | |
423 | ||
424 | /* ARGSUSED */ | |
425 | void | |
426 | child_terminal_info (args, from_tty) | |
427 | char *args; | |
428 | int from_tty; | |
429 | { | |
430 | if (!gdb_has_a_terminal ()) | |
431 | { | |
432 | printf_filtered ("This GDB does not control a terminal.\n"); | |
433 | return; | |
434 | } | |
435 | ||
436 | printf_filtered ("Inferior's terminal status (currently saved by GDB):\n"); | |
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 | |
495 | printf_filtered ("Process group = %d\n", inferior_process_group); | |
496 | #endif | |
497 | ||
498 | SERIAL_PRINT_TTY_STATE (stdin_serial, inferior_ttystate); | |
499 | } | |
500 | \f | |
501 | /* NEW_TTY_PREFORK is called before forking a new child process, | |
502 | so we can record the state of ttys in the child to be formed. | |
503 | TTYNAME is null if we are to share the terminal with gdb; | |
504 | or points to a string containing the name of the desired tty. | |
505 | ||
506 | NEW_TTY is called in new child processes under Unix, which will | |
507 | become debugger target processes. This actually switches to | |
508 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
509 | ||
510 | void | |
511 | new_tty_prefork (ttyname) | |
512 | char *ttyname; | |
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 | |
520 | new_tty () | |
521 | { | |
522 | register int tty; | |
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. */ | |
544 | ||
545 | #ifdef USE_O_NOCTTY | |
c5aa993b | 546 | tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
c906108c | 547 | #else |
c5aa993b | 548 | tty = open (inferior_thisrun_terminal, O_RDWR); |
c906108c SS |
549 | #endif |
550 | if (tty == -1) | |
551 | { | |
552 | print_sys_errmsg (inferior_thisrun_terminal, errno); | |
c5aa993b | 553 | _exit (1); |
c906108c SS |
554 | } |
555 | ||
556 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
557 | if (tty != 0) | |
c5aa993b JM |
558 | { |
559 | close (0); | |
560 | dup (tty); | |
561 | } | |
c906108c | 562 | if (tty != 1) |
c5aa993b JM |
563 | { |
564 | close (1); | |
565 | dup (tty); | |
566 | } | |
c906108c | 567 | if (tty != 2) |
c5aa993b JM |
568 | { |
569 | close (2); | |
570 | dup (tty); | |
571 | } | |
c906108c | 572 | if (tty > 2) |
c5aa993b JM |
573 | close (tty); |
574 | #endif /* !go32 && !win32 */ | |
c906108c SS |
575 | } |
576 | \f | |
577 | /* Kill the inferior process. Make us have no inferior. */ | |
578 | ||
579 | /* ARGSUSED */ | |
580 | static void | |
581 | kill_command (arg, from_tty) | |
582 | char *arg; | |
583 | int from_tty; | |
584 | { | |
585 | /* FIXME: This should not really be inferior_pid (or target_has_execution). | |
586 | It should be a distinct flag that indicates that a target is active, cuz | |
587 | some targets don't have processes! */ | |
588 | ||
589 | if (inferior_pid == 0) | |
590 | error ("The program is not being run."); | |
591 | if (!query ("Kill the program being debugged? ")) | |
592 | error ("Not confirmed."); | |
593 | target_kill (); | |
594 | ||
c5aa993b | 595 | init_thread_list (); /* Destroy thread info */ |
c906108c SS |
596 | |
597 | /* Killing off the inferior can leave us with a core file. If so, | |
598 | print the state we are left in. */ | |
c5aa993b JM |
599 | if (target_has_stack) |
600 | { | |
601 | printf_filtered ("In %s,\n", target_longname); | |
602 | if (selected_frame == NULL) | |
603 | fputs_filtered ("No selected stack frame.\n", gdb_stdout); | |
604 | else | |
605 | print_stack_frame (selected_frame, selected_frame_level, 1); | |
606 | } | |
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 | ||
612 | /* ARGSUSED */ | |
613 | static void | |
614 | pass_signal (signo) | |
c5aa993b | 615 | int signo; |
c906108c SS |
616 | { |
617 | #ifndef _WIN32 | |
618 | kill (PIDGET (inferior_pid), SIGINT); | |
619 | #endif | |
620 | } | |
621 | ||
c5aa993b | 622 | static void (*osig) (); |
c906108c SS |
623 | |
624 | void | |
c5aa993b | 625 | set_sigint_trap () |
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 | |
c5aa993b | 634 | clear_sigint_trap () |
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 | |
646 | handle_sigio (signo) | |
647 | int signo; | |
648 | { | |
649 | int numfds; | |
650 | fd_set readfds; | |
651 | ||
652 | signal (SIGIO, handle_sigio); | |
653 | ||
654 | FD_ZERO (&readfds); | |
655 | FD_SET (target_activity_fd, &readfds); | |
656 | numfds = select (target_activity_fd + 1, &readfds, NULL, NULL, NULL); | |
657 | if (numfds >= 0 && FD_ISSET (target_activity_fd, &readfds)) | |
658 | { | |
659 | #ifndef _WIN32 | |
660 | if ((*target_activity_function) ()) | |
661 | kill (inferior_pid, SIGINT); | |
662 | #endif | |
663 | } | |
664 | } | |
665 | ||
666 | static int old_fcntl_flags; | |
667 | ||
668 | void | |
669 | set_sigio_trap () | |
670 | { | |
671 | if (target_activity_function) | |
672 | { | |
c5aa993b JM |
673 | old_sigio = (void (*)()) signal (SIGIO, handle_sigio); |
674 | fcntl (target_activity_fd, F_SETOWN, getpid ()); | |
c906108c SS |
675 | old_fcntl_flags = fcntl (target_activity_fd, F_GETFL, 0); |
676 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags | FASYNC); | |
677 | } | |
678 | } | |
679 | ||
680 | void | |
681 | clear_sigio_trap () | |
682 | { | |
683 | if (target_activity_function) | |
684 | { | |
685 | signal (SIGIO, old_sigio); | |
686 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags); | |
687 | } | |
688 | } | |
689 | #else /* No SIGIO. */ | |
690 | void | |
691 | set_sigio_trap () | |
692 | { | |
693 | if (target_activity_function) | |
694 | abort (); | |
695 | } | |
696 | ||
697 | void | |
698 | clear_sigio_trap () | |
699 | { | |
700 | if (target_activity_function) | |
701 | abort (); | |
702 | } | |
703 | #endif /* No SIGIO. */ | |
704 | \f | |
705 | ||
706 | /* This is here because this is where we figure out whether we (probably) | |
707 | have job control. Just using job_control only does part of it because | |
708 | setpgid or setpgrp might not exist on a system without job control. | |
709 | It might be considered misplaced (on the other hand, process groups and | |
710 | job control are closely related to ttys). | |
711 | ||
712 | For a more clean implementation, in libiberty, put a setpgid which merely | |
713 | calls setpgrp and a setpgrp which does nothing (any system with job control | |
714 | will have one or the other). */ | |
715 | int | |
716 | gdb_setpgid () | |
717 | { | |
718 | int retval = 0; | |
719 | ||
720 | if (job_control) | |
721 | { | |
722 | #if defined (NEED_POSIX_SETPGID) || (defined (HAVE_TERMIOS) && defined (HAVE_SETPGID)) | |
723 | /* setpgid (0, 0) is supposed to work and mean the same thing as | |
c5aa993b JM |
724 | this, but on Ultrix 4.2A it fails with EPERM (and |
725 | setpgid (getpid (), getpid ()) succeeds). */ | |
c906108c SS |
726 | retval = setpgid (getpid (), getpid ()); |
727 | #else | |
728 | #if defined (TIOCGPGRP) | |
729 | #if defined(USG) && !defined(SETPGRP_ARGS) | |
730 | retval = setpgrp (); | |
731 | #else | |
732 | retval = setpgrp (getpid (), getpid ()); | |
733 | #endif /* USG */ | |
734 | #endif /* TIOCGPGRP. */ | |
735 | #endif /* NEED_POSIX_SETPGID */ | |
736 | } | |
737 | return retval; | |
738 | } | |
739 | ||
740 | void | |
741 | _initialize_inflow () | |
742 | { | |
743 | add_info ("terminal", term_info, | |
c5aa993b | 744 | "Print inferior's saved terminal status."); |
c906108c SS |
745 | |
746 | add_com ("kill", class_run, kill_command, | |
747 | "Kill execution of program being debugged."); | |
748 | ||
749 | inferior_pid = 0; | |
750 | ||
751 | terminal_is_ours = 1; | |
752 | ||
753 | /* OK, figure out whether we have job control. If neither termios nor | |
754 | sgtty (i.e. termio or go32), leave job_control 0. */ | |
755 | ||
756 | #if defined (HAVE_TERMIOS) | |
757 | /* Do all systems with termios have the POSIX way of identifying job | |
758 | control? I hope so. */ | |
759 | #ifdef _POSIX_JOB_CONTROL | |
760 | job_control = 1; | |
761 | #else | |
762 | #ifdef _SC_JOB_CONTROL | |
763 | job_control = sysconf (_SC_JOB_CONTROL); | |
764 | #else | |
c5aa993b JM |
765 | job_control = 0; /* have to assume the worst */ |
766 | #endif /* _SC_JOB_CONTROL */ | |
767 | #endif /* _POSIX_JOB_CONTROL */ | |
768 | #endif /* HAVE_TERMIOS */ | |
c906108c SS |
769 | |
770 | #ifdef HAVE_SGTTY | |
771 | #ifdef TIOCGPGRP | |
772 | job_control = 1; | |
773 | #else | |
774 | job_control = 0; | |
775 | #endif /* TIOCGPGRP */ | |
776 | #endif /* sgtty */ | |
777 | } |