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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> | |
7a292a7a SS |
34 | #ifdef HAVE_SYS_SELECT_H |
35 | #include <sys/select.h> | |
36 | #endif | |
c906108c SS |
37 | |
38 | #ifdef HAVE_TERMIOS | |
39 | #define PROCESS_GROUP_TYPE pid_t | |
40 | #endif | |
41 | ||
42 | #ifdef HAVE_TERMIO | |
43 | #define PROCESS_GROUP_TYPE int | |
44 | #endif | |
45 | ||
46 | #ifdef HAVE_SGTTY | |
47 | #ifdef SHORT_PGRP | |
48 | /* This is only used for the ultra. Does it have pid_t? */ | |
49 | #define PROCESS_GROUP_TYPE short | |
50 | #else | |
51 | #define PROCESS_GROUP_TYPE int | |
52 | #endif | |
53 | #endif /* sgtty */ | |
54 | ||
c2d11a7d JM |
55 | #ifdef HAVE_SYS_IOCTL_H |
56 | #include <sys/ioctl.h> | |
57 | #endif | |
58 | ||
c906108c SS |
59 | #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) |
60 | static void | |
61 | handle_sigio PARAMS ((int)); | |
62 | #endif | |
63 | ||
392a587b JM |
64 | extern void _initialize_inflow PARAMS ((void)); |
65 | ||
c906108c SS |
66 | static void |
67 | pass_signal PARAMS ((int)); | |
68 | ||
69 | static void | |
70 | kill_command PARAMS ((char *, int)); | |
71 | ||
72 | static void | |
73 | terminal_ours_1 PARAMS ((int)); | |
74 | \f | |
75 | /* Record terminal status separately for debugger and inferior. */ | |
76 | ||
77 | static serial_t stdin_serial; | |
78 | ||
79 | /* TTY state for the inferior. We save it whenever the inferior stops, and | |
80 | restore it when it resumes. */ | |
81 | static serial_ttystate inferior_ttystate; | |
82 | ||
83 | /* Our own tty state, which we restore every time we need to deal with the | |
84 | terminal. We only set it once, when GDB first starts. The settings of | |
85 | flags which readline saves and restores and unimportant. */ | |
86 | static serial_ttystate our_ttystate; | |
87 | ||
88 | /* fcntl flags for us and the inferior. Saved and restored just like | |
89 | {our,inferior}_ttystate. */ | |
90 | static int tflags_inferior; | |
91 | static int tflags_ours; | |
92 | ||
93 | #ifdef PROCESS_GROUP_TYPE | |
94 | /* Process group for us and the inferior. Saved and restored just like | |
95 | {our,inferior}_ttystate. */ | |
96 | PROCESS_GROUP_TYPE our_process_group; | |
97 | PROCESS_GROUP_TYPE inferior_process_group; | |
98 | #endif | |
99 | ||
100 | /* While the inferior is running, we want SIGINT and SIGQUIT to go to the | |
101 | inferior only. If we have job control, that takes care of it. If not, | |
102 | we save our handlers in these two variables and set SIGINT and SIGQUIT | |
103 | to SIG_IGN. */ | |
104 | ||
105 | static void (*sigint_ours) (); | |
106 | static void (*sigquit_ours) (); | |
107 | ||
108 | /* The name of the tty (from the `tty' command) that we gave to the inferior | |
109 | when it was last started. */ | |
110 | ||
111 | static char *inferior_thisrun_terminal; | |
112 | ||
113 | /* Nonzero if our terminal settings are in effect. Zero if the | |
114 | inferior's settings are in effect. Ignored if !gdb_has_a_terminal | |
115 | (). */ | |
116 | ||
117 | int terminal_is_ours; | |
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 | |
127 | gdb_has_a_terminal () | |
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: | |
136 | /* Get all the current tty settings (including whether we have a tty at | |
c5aa993b JM |
137 | all!). Can't do this in _initialize_inflow because SERIAL_FDOPEN |
138 | won't work until the serial_ops_list is initialized. */ | |
c906108c SS |
139 | |
140 | #ifdef F_GETFL | |
141 | tflags_ours = fcntl (0, F_GETFL, 0); | |
142 | #endif | |
143 | ||
144 | gdb_has_a_terminal_flag = no; | |
145 | stdin_serial = SERIAL_FDOPEN (0); | |
146 | if (stdin_serial != NULL) | |
147 | { | |
148 | our_ttystate = SERIAL_GET_TTY_STATE (stdin_serial); | |
149 | ||
150 | if (our_ttystate != NULL) | |
151 | { | |
152 | gdb_has_a_terminal_flag = yes; | |
153 | #ifdef HAVE_TERMIOS | |
154 | our_process_group = tcgetpgrp (0); | |
155 | #endif | |
156 | #ifdef HAVE_TERMIO | |
157 | our_process_group = getpgrp (); | |
158 | #endif | |
159 | #ifdef HAVE_SGTTY | |
160 | ioctl (0, TIOCGPGRP, &our_process_group); | |
161 | #endif | |
162 | } | |
163 | } | |
164 | ||
165 | return gdb_has_a_terminal_flag == yes; | |
166 | default: | |
167 | /* "Can't happen". */ | |
168 | return 0; | |
169 | } | |
170 | } | |
171 | ||
172 | /* Macro for printing errors from ioctl operations */ | |
173 | ||
174 | #define OOPSY(what) \ | |
175 | if (result == -1) \ | |
176 | fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ | |
177 | what, strerror (errno)) | |
178 | ||
179 | static void terminal_ours_1 PARAMS ((int)); | |
180 | ||
181 | /* Initialize the terminal settings we record for the inferior, | |
182 | before we actually run the inferior. */ | |
183 | ||
184 | void | |
185 | terminal_init_inferior_with_pgrp (pgrp) | |
186 | int pgrp; | |
187 | { | |
188 | if (gdb_has_a_terminal ()) | |
189 | { | |
190 | /* We could just as well copy our_ttystate (if we felt like adding | |
c5aa993b | 191 | a new function SERIAL_COPY_TTY_STATE). */ |
c906108c SS |
192 | if (inferior_ttystate) |
193 | free (inferior_ttystate); | |
194 | inferior_ttystate = SERIAL_GET_TTY_STATE (stdin_serial); | |
195 | ||
196 | #ifdef PROCESS_GROUP_TYPE | |
197 | inferior_process_group = pgrp; | |
198 | #endif | |
199 | ||
200 | /* Make sure that next time we call terminal_inferior (which will be | |
c5aa993b JM |
201 | before the program runs, as it needs to be), we install the new |
202 | process group. */ | |
c906108c SS |
203 | terminal_is_ours = 1; |
204 | } | |
205 | } | |
206 | ||
207 | void | |
208 | terminal_init_inferior () | |
209 | { | |
210 | #ifdef PROCESS_GROUP_TYPE | |
211 | /* This is for Lynx, and should be cleaned up by having Lynx be a separate | |
212 | debugging target with a version of target_terminal_init_inferior which | |
213 | passes in the process group to a generic routine which does all the work | |
214 | (and the non-threaded child_terminal_init_inferior can just pass in | |
215 | inferior_pid to the same routine). */ | |
216 | /* We assume INFERIOR_PID is also the child's process group. */ | |
217 | terminal_init_inferior_with_pgrp (PIDGET (inferior_pid)); | |
218 | #endif /* PROCESS_GROUP_TYPE */ | |
219 | } | |
220 | ||
221 | /* Put the inferior's terminal settings into effect. | |
222 | This is preparation for starting or resuming the inferior. */ | |
223 | ||
224 | void | |
225 | terminal_inferior () | |
226 | { | |
227 | if (gdb_has_a_terminal () && terminal_is_ours | |
228 | && inferior_thisrun_terminal == 0) | |
229 | { | |
230 | int result; | |
231 | ||
232 | #ifdef F_GETFL | |
233 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
234 | places we use F_SETFL, so I'm inclined to think perhaps there |
235 | is some reason, however perverse. Perhaps not though... */ | |
c906108c SS |
236 | result = fcntl (0, F_SETFL, tflags_inferior); |
237 | result = fcntl (0, F_SETFL, tflags_inferior); | |
238 | OOPSY ("fcntl F_SETFL"); | |
239 | #endif | |
240 | ||
241 | /* Because we were careful to not change in or out of raw mode in | |
c5aa993b JM |
242 | terminal_ours, we will not change in our out of raw mode with |
243 | this call, so we don't flush any input. */ | |
c906108c SS |
244 | result = SERIAL_SET_TTY_STATE (stdin_serial, inferior_ttystate); |
245 | OOPSY ("setting tty state"); | |
246 | ||
247 | if (!job_control) | |
248 | { | |
c5aa993b | 249 | sigint_ours = (void (*)()) signal (SIGINT, SIG_IGN); |
c906108c | 250 | #ifdef SIGQUIT |
c5aa993b | 251 | sigquit_ours = (void (*)()) signal (SIGQUIT, SIG_IGN); |
c906108c SS |
252 | #endif |
253 | } | |
254 | ||
255 | /* If attach_flag is set, we don't know whether we are sharing a | |
c5aa993b JM |
256 | terminal with the inferior or not. (attaching a process |
257 | without a terminal is one case where we do not; attaching a | |
258 | process which we ran from the same shell as GDB via `&' is | |
259 | one case where we do, I think (but perhaps this is not | |
260 | `sharing' in the sense that we need to save and restore tty | |
261 | state)). I don't know if there is any way to tell whether we | |
262 | are sharing a terminal. So what we do is to go through all | |
263 | the saving and restoring of the tty state, but ignore errors | |
264 | setting the process group, which will happen if we are not | |
265 | sharing a terminal). */ | |
c906108c SS |
266 | |
267 | if (job_control) | |
268 | { | |
269 | #ifdef HAVE_TERMIOS | |
270 | result = tcsetpgrp (0, inferior_process_group); | |
271 | if (!attach_flag) | |
272 | OOPSY ("tcsetpgrp"); | |
273 | #endif | |
274 | ||
275 | #ifdef HAVE_SGTTY | |
276 | result = ioctl (0, TIOCSPGRP, &inferior_process_group); | |
277 | if (!attach_flag) | |
278 | OOPSY ("TIOCSPGRP"); | |
279 | #endif | |
280 | } | |
281 | ||
282 | } | |
283 | terminal_is_ours = 0; | |
284 | } | |
285 | ||
286 | /* Put some of our terminal settings into effect, | |
287 | enough to get proper results from our output, | |
288 | but do not change into or out of RAW mode | |
289 | so that no input is discarded. | |
290 | ||
291 | After doing this, either terminal_ours or terminal_inferior | |
292 | should be called to get back to a normal state of affairs. */ | |
293 | ||
294 | void | |
295 | terminal_ours_for_output () | |
296 | { | |
297 | terminal_ours_1 (1); | |
298 | } | |
299 | ||
300 | /* Put our terminal settings into effect. | |
301 | First record the inferior's terminal settings | |
302 | so they can be restored properly later. */ | |
303 | ||
304 | void | |
305 | terminal_ours () | |
306 | { | |
307 | terminal_ours_1 (0); | |
308 | } | |
309 | ||
310 | /* output_only is not used, and should not be used unless we introduce | |
311 | separate terminal_is_ours and terminal_is_ours_for_output | |
312 | flags. */ | |
313 | ||
314 | static void | |
315 | terminal_ours_1 (output_only) | |
316 | int output_only; | |
317 | { | |
318 | /* Checking inferior_thisrun_terminal is necessary so that | |
319 | if GDB is running in the background, it won't block trying | |
320 | to do the ioctl()'s below. Checking gdb_has_a_terminal | |
321 | avoids attempting all the ioctl's when running in batch. */ | |
322 | if (inferior_thisrun_terminal != 0 || gdb_has_a_terminal () == 0) | |
323 | return; | |
324 | ||
325 | if (!terminal_is_ours) | |
326 | { | |
327 | /* Ignore this signal since it will happen when we try to set the | |
c5aa993b | 328 | pgrp. */ |
c906108c SS |
329 | void (*osigttou) (); |
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) | |
340 | free (inferior_ttystate); | |
341 | inferior_ttystate = SERIAL_GET_TTY_STATE (stdin_serial); | |
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 SS |
365 | |
366 | SERIAL_NOFLUSH_SET_TTY_STATE (stdin_serial, our_ttystate, | |
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", | |
c5aa993b | 380 | 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 | |
411 | ||
c5aa993b | 412 | result = result; /* lint */ |
c906108c SS |
413 | } |
414 | } | |
415 | ||
416 | /* ARGSUSED */ | |
417 | void | |
418 | term_info (arg, from_tty) | |
419 | char *arg; | |
420 | int from_tty; | |
421 | { | |
422 | target_terminal_info (arg, from_tty); | |
423 | } | |
424 | ||
425 | /* ARGSUSED */ | |
426 | void | |
427 | child_terminal_info (args, from_tty) | |
428 | char *args; | |
429 | int from_tty; | |
430 | { | |
431 | if (!gdb_has_a_terminal ()) | |
432 | { | |
433 | printf_filtered ("This GDB does not control a terminal.\n"); | |
434 | return; | |
435 | } | |
436 | ||
437 | printf_filtered ("Inferior's terminal status (currently saved by GDB):\n"); | |
438 | ||
439 | /* First the fcntl flags. */ | |
440 | { | |
441 | int flags; | |
c5aa993b | 442 | |
c906108c SS |
443 | flags = tflags_inferior; |
444 | ||
445 | printf_filtered ("File descriptor flags = "); | |
446 | ||
447 | #ifndef O_ACCMODE | |
448 | #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) | |
449 | #endif | |
450 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug */ | |
451 | switch (flags & (O_ACCMODE)) | |
452 | { | |
c5aa993b JM |
453 | case O_RDONLY: |
454 | printf_filtered ("O_RDONLY"); | |
455 | break; | |
456 | case O_WRONLY: | |
457 | printf_filtered ("O_WRONLY"); | |
458 | break; | |
459 | case O_RDWR: | |
460 | printf_filtered ("O_RDWR"); | |
461 | break; | |
c906108c SS |
462 | } |
463 | flags &= ~(O_ACCMODE); | |
464 | ||
465 | #ifdef O_NONBLOCK | |
c5aa993b | 466 | if (flags & O_NONBLOCK) |
c906108c SS |
467 | printf_filtered (" | O_NONBLOCK"); |
468 | flags &= ~O_NONBLOCK; | |
469 | #endif | |
c5aa993b | 470 | |
c906108c SS |
471 | #if defined (O_NDELAY) |
472 | /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will | |
473 | print it as O_NONBLOCK, which is good cause that is what POSIX | |
474 | has, and the flag will already be cleared by the time we get here. */ | |
475 | if (flags & O_NDELAY) | |
476 | printf_filtered (" | O_NDELAY"); | |
477 | flags &= ~O_NDELAY; | |
478 | #endif | |
479 | ||
480 | if (flags & O_APPEND) | |
481 | printf_filtered (" | O_APPEND"); | |
482 | flags &= ~O_APPEND; | |
483 | ||
484 | #if defined (O_BINARY) | |
485 | if (flags & O_BINARY) | |
486 | printf_filtered (" | O_BINARY"); | |
487 | flags &= ~O_BINARY; | |
488 | #endif | |
489 | ||
490 | if (flags) | |
491 | printf_filtered (" | 0x%x", flags); | |
492 | printf_filtered ("\n"); | |
493 | } | |
494 | ||
495 | #ifdef PROCESS_GROUP_TYPE | |
2acceee2 JM |
496 | printf_filtered ("Process group = %d\n", |
497 | (int) inferior_process_group); | |
c906108c SS |
498 | #endif |
499 | ||
c2c6d25f | 500 | SERIAL_PRINT_TTY_STATE (stdin_serial, inferior_ttystate, gdb_stdout); |
c906108c SS |
501 | } |
502 | \f | |
503 | /* NEW_TTY_PREFORK is called before forking a new child process, | |
504 | so we can record the state of ttys in the child to be formed. | |
505 | TTYNAME is null if we are to share the terminal with gdb; | |
506 | or points to a string containing the name of the desired tty. | |
507 | ||
508 | NEW_TTY is called in new child processes under Unix, which will | |
509 | become debugger target processes. This actually switches to | |
510 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
511 | ||
512 | void | |
513 | new_tty_prefork (ttyname) | |
514 | char *ttyname; | |
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 | |
522 | new_tty () | |
523 | { | |
524 | register int tty; | |
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. */ | |
546 | ||
547 | #ifdef USE_O_NOCTTY | |
c5aa993b | 548 | tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
c906108c | 549 | #else |
c5aa993b | 550 | tty = open (inferior_thisrun_terminal, O_RDWR); |
c906108c SS |
551 | #endif |
552 | if (tty == -1) | |
553 | { | |
554 | print_sys_errmsg (inferior_thisrun_terminal, errno); | |
c5aa993b | 555 | _exit (1); |
c906108c SS |
556 | } |
557 | ||
558 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
559 | if (tty != 0) | |
c5aa993b JM |
560 | { |
561 | close (0); | |
562 | dup (tty); | |
563 | } | |
c906108c | 564 | if (tty != 1) |
c5aa993b JM |
565 | { |
566 | close (1); | |
567 | dup (tty); | |
568 | } | |
c906108c | 569 | if (tty != 2) |
c5aa993b JM |
570 | { |
571 | close (2); | |
572 | dup (tty); | |
573 | } | |
c906108c | 574 | if (tty > 2) |
c5aa993b JM |
575 | close (tty); |
576 | #endif /* !go32 && !win32 */ | |
c906108c SS |
577 | } |
578 | \f | |
579 | /* Kill the inferior process. Make us have no inferior. */ | |
580 | ||
581 | /* ARGSUSED */ | |
582 | static void | |
583 | kill_command (arg, from_tty) | |
584 | char *arg; | |
585 | int from_tty; | |
586 | { | |
587 | /* FIXME: This should not really be inferior_pid (or target_has_execution). | |
588 | It should be a distinct flag that indicates that a target is active, cuz | |
589 | some targets don't have processes! */ | |
590 | ||
591 | if (inferior_pid == 0) | |
592 | error ("The program is not being run."); | |
593 | if (!query ("Kill the program being debugged? ")) | |
594 | error ("Not confirmed."); | |
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 | { | |
603 | printf_filtered ("In %s,\n", target_longname); | |
604 | if (selected_frame == NULL) | |
605 | fputs_filtered ("No selected stack frame.\n", gdb_stdout); | |
606 | else | |
607 | print_stack_frame (selected_frame, selected_frame_level, 1); | |
608 | } | |
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 | ||
614 | /* ARGSUSED */ | |
615 | static void | |
616 | pass_signal (signo) | |
c5aa993b | 617 | int signo; |
c906108c SS |
618 | { |
619 | #ifndef _WIN32 | |
620 | kill (PIDGET (inferior_pid), SIGINT); | |
621 | #endif | |
622 | } | |
623 | ||
c5aa993b | 624 | static void (*osig) (); |
c906108c SS |
625 | |
626 | void | |
c5aa993b | 627 | set_sigint_trap () |
c906108c SS |
628 | { |
629 | if (attach_flag || inferior_thisrun_terminal) | |
630 | { | |
c5aa993b | 631 | osig = (void (*)()) signal (SIGINT, pass_signal); |
c906108c SS |
632 | } |
633 | } | |
634 | ||
635 | void | |
c5aa993b | 636 | clear_sigint_trap () |
c906108c SS |
637 | { |
638 | if (attach_flag || inferior_thisrun_terminal) | |
639 | { | |
640 | signal (SIGINT, osig); | |
641 | } | |
642 | } | |
643 | \f | |
644 | #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) | |
645 | static void (*old_sigio) (); | |
646 | ||
647 | static void | |
648 | handle_sigio (signo) | |
649 | int signo; | |
650 | { | |
651 | int numfds; | |
652 | fd_set readfds; | |
653 | ||
654 | signal (SIGIO, handle_sigio); | |
655 | ||
656 | FD_ZERO (&readfds); | |
657 | FD_SET (target_activity_fd, &readfds); | |
658 | numfds = select (target_activity_fd + 1, &readfds, NULL, NULL, NULL); | |
659 | if (numfds >= 0 && FD_ISSET (target_activity_fd, &readfds)) | |
660 | { | |
661 | #ifndef _WIN32 | |
662 | if ((*target_activity_function) ()) | |
663 | kill (inferior_pid, SIGINT); | |
664 | #endif | |
665 | } | |
666 | } | |
667 | ||
668 | static int old_fcntl_flags; | |
669 | ||
670 | void | |
671 | set_sigio_trap () | |
672 | { | |
673 | if (target_activity_function) | |
674 | { | |
c5aa993b JM |
675 | old_sigio = (void (*)()) signal (SIGIO, handle_sigio); |
676 | fcntl (target_activity_fd, F_SETOWN, getpid ()); | |
c906108c SS |
677 | old_fcntl_flags = fcntl (target_activity_fd, F_GETFL, 0); |
678 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags | FASYNC); | |
679 | } | |
680 | } | |
681 | ||
682 | void | |
683 | clear_sigio_trap () | |
684 | { | |
685 | if (target_activity_function) | |
686 | { | |
687 | signal (SIGIO, old_sigio); | |
688 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags); | |
689 | } | |
690 | } | |
691 | #else /* No SIGIO. */ | |
692 | void | |
693 | set_sigio_trap () | |
694 | { | |
695 | if (target_activity_function) | |
696 | abort (); | |
697 | } | |
698 | ||
699 | void | |
700 | clear_sigio_trap () | |
701 | { | |
702 | if (target_activity_function) | |
703 | abort (); | |
704 | } | |
705 | #endif /* No SIGIO. */ | |
706 | \f | |
707 | ||
708 | /* This is here because this is where we figure out whether we (probably) | |
709 | have job control. Just using job_control only does part of it because | |
710 | setpgid or setpgrp might not exist on a system without job control. | |
711 | It might be considered misplaced (on the other hand, process groups and | |
712 | job control are closely related to ttys). | |
713 | ||
714 | For a more clean implementation, in libiberty, put a setpgid which merely | |
715 | calls setpgrp and a setpgrp which does nothing (any system with job control | |
716 | will have one or the other). */ | |
717 | int | |
718 | gdb_setpgid () | |
719 | { | |
720 | int retval = 0; | |
721 | ||
722 | if (job_control) | |
723 | { | |
724 | #if defined (NEED_POSIX_SETPGID) || (defined (HAVE_TERMIOS) && defined (HAVE_SETPGID)) | |
725 | /* setpgid (0, 0) is supposed to work and mean the same thing as | |
c5aa993b JM |
726 | this, but on Ultrix 4.2A it fails with EPERM (and |
727 | setpgid (getpid (), getpid ()) succeeds). */ | |
c906108c SS |
728 | retval = setpgid (getpid (), getpid ()); |
729 | #else | |
730 | #if defined (TIOCGPGRP) | |
731 | #if defined(USG) && !defined(SETPGRP_ARGS) | |
732 | retval = setpgrp (); | |
733 | #else | |
734 | retval = setpgrp (getpid (), getpid ()); | |
735 | #endif /* USG */ | |
736 | #endif /* TIOCGPGRP. */ | |
737 | #endif /* NEED_POSIX_SETPGID */ | |
738 | } | |
739 | return retval; | |
740 | } | |
741 | ||
742 | void | |
743 | _initialize_inflow () | |
744 | { | |
745 | add_info ("terminal", term_info, | |
c5aa993b | 746 | "Print inferior's saved terminal status."); |
c906108c SS |
747 | |
748 | add_com ("kill", class_run, kill_command, | |
749 | "Kill execution of program being debugged."); | |
750 | ||
751 | inferior_pid = 0; | |
752 | ||
753 | terminal_is_ours = 1; | |
754 | ||
755 | /* OK, figure out whether we have job control. If neither termios nor | |
756 | sgtty (i.e. termio or go32), leave job_control 0. */ | |
757 | ||
758 | #if defined (HAVE_TERMIOS) | |
759 | /* Do all systems with termios have the POSIX way of identifying job | |
760 | control? I hope so. */ | |
761 | #ifdef _POSIX_JOB_CONTROL | |
762 | job_control = 1; | |
763 | #else | |
764 | #ifdef _SC_JOB_CONTROL | |
765 | job_control = sysconf (_SC_JOB_CONTROL); | |
766 | #else | |
c5aa993b JM |
767 | job_control = 0; /* have to assume the worst */ |
768 | #endif /* _SC_JOB_CONTROL */ | |
769 | #endif /* _POSIX_JOB_CONTROL */ | |
770 | #endif /* HAVE_TERMIOS */ | |
c906108c SS |
771 | |
772 | #ifdef HAVE_SGTTY | |
773 | #ifdef TIOCGPGRP | |
774 | job_control = 1; | |
775 | #else | |
776 | job_control = 0; | |
777 | #endif /* TIOCGPGRP */ | |
778 | #endif /* sgtty */ | |
779 | } |