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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 | ||
4 | This file is part of GDB. | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "frame.h" | |
22 | #include "inferior.h" | |
23 | #include "command.h" | |
24 | #include "signals.h" | |
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> | |
33 | #ifdef HAVE_UNISTD_H | |
34 | #include <unistd.h> | |
35 | #endif | |
7a292a7a SS |
36 | #ifdef HAVE_SYS_SELECT_H |
37 | #include <sys/select.h> | |
38 | #endif | |
c906108c SS |
39 | |
40 | #ifdef HAVE_TERMIOS | |
41 | #define PROCESS_GROUP_TYPE pid_t | |
42 | #endif | |
43 | ||
44 | #ifdef HAVE_TERMIO | |
45 | #define PROCESS_GROUP_TYPE int | |
46 | #endif | |
47 | ||
48 | #ifdef HAVE_SGTTY | |
49 | #ifdef SHORT_PGRP | |
50 | /* This is only used for the ultra. Does it have pid_t? */ | |
51 | #define PROCESS_GROUP_TYPE short | |
52 | #else | |
53 | #define PROCESS_GROUP_TYPE int | |
54 | #endif | |
55 | #endif /* sgtty */ | |
56 | ||
57 | #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) | |
58 | static void | |
59 | handle_sigio PARAMS ((int)); | |
60 | #endif | |
61 | ||
392a587b JM |
62 | extern void _initialize_inflow PARAMS ((void)); |
63 | ||
c906108c SS |
64 | static void |
65 | pass_signal PARAMS ((int)); | |
66 | ||
67 | static void | |
68 | kill_command PARAMS ((char *, int)); | |
69 | ||
70 | static void | |
71 | terminal_ours_1 PARAMS ((int)); | |
72 | \f | |
73 | /* Record terminal status separately for debugger and inferior. */ | |
74 | ||
75 | static serial_t stdin_serial; | |
76 | ||
77 | /* TTY state for the inferior. We save it whenever the inferior stops, and | |
78 | restore it when it resumes. */ | |
79 | static serial_ttystate inferior_ttystate; | |
80 | ||
81 | /* Our own tty state, which we restore every time we need to deal with the | |
82 | terminal. We only set it once, when GDB first starts. The settings of | |
83 | flags which readline saves and restores and unimportant. */ | |
84 | static serial_ttystate our_ttystate; | |
85 | ||
86 | /* fcntl flags for us and the inferior. Saved and restored just like | |
87 | {our,inferior}_ttystate. */ | |
88 | static int tflags_inferior; | |
89 | static int tflags_ours; | |
90 | ||
91 | #ifdef PROCESS_GROUP_TYPE | |
92 | /* Process group for us and the inferior. Saved and restored just like | |
93 | {our,inferior}_ttystate. */ | |
94 | PROCESS_GROUP_TYPE our_process_group; | |
95 | PROCESS_GROUP_TYPE inferior_process_group; | |
96 | #endif | |
97 | ||
98 | /* While the inferior is running, we want SIGINT and SIGQUIT to go to the | |
99 | inferior only. If we have job control, that takes care of it. If not, | |
100 | we save our handlers in these two variables and set SIGINT and SIGQUIT | |
101 | to SIG_IGN. */ | |
102 | ||
103 | static void (*sigint_ours) (); | |
104 | static void (*sigquit_ours) (); | |
105 | ||
106 | /* The name of the tty (from the `tty' command) that we gave to the inferior | |
107 | when it was last started. */ | |
108 | ||
109 | static char *inferior_thisrun_terminal; | |
110 | ||
111 | /* Nonzero if our terminal settings are in effect. Zero if the | |
112 | inferior's settings are in effect. Ignored if !gdb_has_a_terminal | |
113 | (). */ | |
114 | ||
115 | int terminal_is_ours; | |
116 | ||
117 | enum {yes, no, have_not_checked} gdb_has_a_terminal_flag = have_not_checked; | |
118 | ||
119 | /* Does GDB have a terminal (on stdin)? */ | |
120 | int | |
121 | gdb_has_a_terminal () | |
122 | { | |
123 | switch (gdb_has_a_terminal_flag) | |
124 | { | |
125 | case yes: | |
126 | return 1; | |
127 | case no: | |
128 | return 0; | |
129 | case have_not_checked: | |
130 | /* Get all the current tty settings (including whether we have a tty at | |
131 | all!). Can't do this in _initialize_inflow because SERIAL_FDOPEN | |
132 | won't work until the serial_ops_list is initialized. */ | |
133 | ||
134 | #ifdef F_GETFL | |
135 | tflags_ours = fcntl (0, F_GETFL, 0); | |
136 | #endif | |
137 | ||
138 | gdb_has_a_terminal_flag = no; | |
139 | stdin_serial = SERIAL_FDOPEN (0); | |
140 | if (stdin_serial != NULL) | |
141 | { | |
142 | our_ttystate = SERIAL_GET_TTY_STATE (stdin_serial); | |
143 | ||
144 | if (our_ttystate != NULL) | |
145 | { | |
146 | gdb_has_a_terminal_flag = yes; | |
147 | #ifdef HAVE_TERMIOS | |
148 | our_process_group = tcgetpgrp (0); | |
149 | #endif | |
150 | #ifdef HAVE_TERMIO | |
151 | our_process_group = getpgrp (); | |
152 | #endif | |
153 | #ifdef HAVE_SGTTY | |
154 | ioctl (0, TIOCGPGRP, &our_process_group); | |
155 | #endif | |
156 | } | |
157 | } | |
158 | ||
159 | return gdb_has_a_terminal_flag == yes; | |
160 | default: | |
161 | /* "Can't happen". */ | |
162 | return 0; | |
163 | } | |
164 | } | |
165 | ||
166 | /* Macro for printing errors from ioctl operations */ | |
167 | ||
168 | #define OOPSY(what) \ | |
169 | if (result == -1) \ | |
170 | fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ | |
171 | what, strerror (errno)) | |
172 | ||
173 | static void terminal_ours_1 PARAMS ((int)); | |
174 | ||
175 | /* Initialize the terminal settings we record for the inferior, | |
176 | before we actually run the inferior. */ | |
177 | ||
178 | void | |
179 | terminal_init_inferior_with_pgrp (pgrp) | |
180 | int pgrp; | |
181 | { | |
182 | if (gdb_has_a_terminal ()) | |
183 | { | |
184 | /* We could just as well copy our_ttystate (if we felt like adding | |
185 | a new function SERIAL_COPY_TTY_STATE). */ | |
186 | if (inferior_ttystate) | |
187 | free (inferior_ttystate); | |
188 | inferior_ttystate = SERIAL_GET_TTY_STATE (stdin_serial); | |
189 | ||
190 | #ifdef PROCESS_GROUP_TYPE | |
191 | inferior_process_group = pgrp; | |
192 | #endif | |
193 | ||
194 | /* Make sure that next time we call terminal_inferior (which will be | |
195 | before the program runs, as it needs to be), we install the new | |
196 | process group. */ | |
197 | terminal_is_ours = 1; | |
198 | } | |
199 | } | |
200 | ||
201 | void | |
202 | terminal_init_inferior () | |
203 | { | |
204 | #ifdef PROCESS_GROUP_TYPE | |
205 | /* This is for Lynx, and should be cleaned up by having Lynx be a separate | |
206 | debugging target with a version of target_terminal_init_inferior which | |
207 | passes in the process group to a generic routine which does all the work | |
208 | (and the non-threaded child_terminal_init_inferior can just pass in | |
209 | inferior_pid to the same routine). */ | |
210 | /* We assume INFERIOR_PID is also the child's process group. */ | |
211 | terminal_init_inferior_with_pgrp (PIDGET (inferior_pid)); | |
212 | #endif /* PROCESS_GROUP_TYPE */ | |
213 | } | |
214 | ||
215 | /* Put the inferior's terminal settings into effect. | |
216 | This is preparation for starting or resuming the inferior. */ | |
217 | ||
218 | void | |
219 | terminal_inferior () | |
220 | { | |
221 | if (gdb_has_a_terminal () && terminal_is_ours | |
222 | && inferior_thisrun_terminal == 0) | |
223 | { | |
224 | int result; | |
225 | ||
226 | #ifdef F_GETFL | |
227 | /* Is there a reason this is being done twice? It happens both | |
228 | places we use F_SETFL, so I'm inclined to think perhaps there | |
229 | is some reason, however perverse. Perhaps not though... */ | |
230 | result = fcntl (0, F_SETFL, tflags_inferior); | |
231 | result = fcntl (0, F_SETFL, tflags_inferior); | |
232 | OOPSY ("fcntl F_SETFL"); | |
233 | #endif | |
234 | ||
235 | /* Because we were careful to not change in or out of raw mode in | |
236 | terminal_ours, we will not change in our out of raw mode with | |
237 | this call, so we don't flush any input. */ | |
238 | result = SERIAL_SET_TTY_STATE (stdin_serial, inferior_ttystate); | |
239 | OOPSY ("setting tty state"); | |
240 | ||
241 | if (!job_control) | |
242 | { | |
243 | sigint_ours = (void (*) ()) signal (SIGINT, SIG_IGN); | |
244 | #ifdef SIGQUIT | |
245 | sigquit_ours = (void (*) ()) signal (SIGQUIT, SIG_IGN); | |
246 | #endif | |
247 | } | |
248 | ||
249 | /* If attach_flag is set, we don't know whether we are sharing a | |
250 | terminal with the inferior or not. (attaching a process | |
251 | without a terminal is one case where we do not; attaching a | |
252 | process which we ran from the same shell as GDB via `&' is | |
253 | one case where we do, I think (but perhaps this is not | |
254 | `sharing' in the sense that we need to save and restore tty | |
255 | state)). I don't know if there is any way to tell whether we | |
256 | are sharing a terminal. So what we do is to go through all | |
257 | the saving and restoring of the tty state, but ignore errors | |
258 | setting the process group, which will happen if we are not | |
259 | sharing a terminal). */ | |
260 | ||
261 | if (job_control) | |
262 | { | |
263 | #ifdef HAVE_TERMIOS | |
264 | result = tcsetpgrp (0, inferior_process_group); | |
265 | if (!attach_flag) | |
266 | OOPSY ("tcsetpgrp"); | |
267 | #endif | |
268 | ||
269 | #ifdef HAVE_SGTTY | |
270 | result = ioctl (0, TIOCSPGRP, &inferior_process_group); | |
271 | if (!attach_flag) | |
272 | OOPSY ("TIOCSPGRP"); | |
273 | #endif | |
274 | } | |
275 | ||
276 | } | |
277 | terminal_is_ours = 0; | |
278 | } | |
279 | ||
280 | /* Put some of our terminal settings into effect, | |
281 | enough to get proper results from our output, | |
282 | but do not change into or out of RAW mode | |
283 | so that no input is discarded. | |
284 | ||
285 | After doing this, either terminal_ours or terminal_inferior | |
286 | should be called to get back to a normal state of affairs. */ | |
287 | ||
288 | void | |
289 | terminal_ours_for_output () | |
290 | { | |
291 | terminal_ours_1 (1); | |
292 | } | |
293 | ||
294 | /* Put our terminal settings into effect. | |
295 | First record the inferior's terminal settings | |
296 | so they can be restored properly later. */ | |
297 | ||
298 | void | |
299 | terminal_ours () | |
300 | { | |
301 | terminal_ours_1 (0); | |
302 | } | |
303 | ||
304 | /* output_only is not used, and should not be used unless we introduce | |
305 | separate terminal_is_ours and terminal_is_ours_for_output | |
306 | flags. */ | |
307 | ||
308 | static void | |
309 | terminal_ours_1 (output_only) | |
310 | int output_only; | |
311 | { | |
312 | /* Checking inferior_thisrun_terminal is necessary so that | |
313 | if GDB is running in the background, it won't block trying | |
314 | to do the ioctl()'s below. Checking gdb_has_a_terminal | |
315 | avoids attempting all the ioctl's when running in batch. */ | |
316 | if (inferior_thisrun_terminal != 0 || gdb_has_a_terminal () == 0) | |
317 | return; | |
318 | ||
319 | if (!terminal_is_ours) | |
320 | { | |
321 | /* Ignore this signal since it will happen when we try to set the | |
322 | pgrp. */ | |
323 | void (*osigttou) (); | |
324 | int result; | |
325 | ||
326 | terminal_is_ours = 1; | |
327 | ||
328 | #ifdef SIGTTOU | |
329 | if (job_control) | |
330 | osigttou = (void (*) ()) signal (SIGTTOU, SIG_IGN); | |
331 | #endif | |
332 | ||
333 | if (inferior_ttystate) | |
334 | free (inferior_ttystate); | |
335 | inferior_ttystate = SERIAL_GET_TTY_STATE (stdin_serial); | |
336 | #ifdef HAVE_TERMIOS | |
337 | inferior_process_group = tcgetpgrp (0); | |
338 | #endif | |
339 | #ifdef HAVE_TERMIO | |
340 | inferior_process_group = getpgrp (); | |
341 | #endif | |
342 | #ifdef HAVE_SGTTY | |
343 | ioctl (0, TIOCGPGRP, &inferior_process_group); | |
344 | #endif | |
345 | ||
346 | /* Here we used to set ICANON in our ttystate, but I believe this | |
347 | was an artifact from before when we used readline. Readline sets | |
348 | the tty state when it needs to. | |
349 | FIXME-maybe: However, query() expects non-raw mode and doesn't | |
350 | use readline. Maybe query should use readline (on the other hand, | |
351 | this only matters for HAVE_SGTTY, not termio or termios, I think). */ | |
352 | ||
353 | /* Set tty state to our_ttystate. We don't change in our out of raw | |
354 | mode, to avoid flushing input. We need to do the same thing | |
355 | regardless of output_only, because we don't have separate | |
356 | terminal_is_ours and terminal_is_ours_for_output flags. It's OK, | |
357 | though, since readline will deal with raw mode when/if it needs to. | |
358 | */ | |
359 | ||
360 | SERIAL_NOFLUSH_SET_TTY_STATE (stdin_serial, our_ttystate, | |
361 | inferior_ttystate); | |
362 | ||
363 | if (job_control) | |
364 | { | |
365 | #ifdef HAVE_TERMIOS | |
366 | result = tcsetpgrp (0, our_process_group); | |
367 | #if 0 | |
368 | /* This fails on Ultrix with EINVAL if you run the testsuite | |
369 | in the background with nohup, and then log out. GDB never | |
370 | used to check for an error here, so perhaps there are other | |
371 | such situations as well. */ | |
372 | if (result == -1) | |
373 | fprintf_unfiltered (gdb_stderr, "[tcsetpgrp failed in terminal_ours: %s]\n", | |
374 | strerror (errno)); | |
375 | #endif | |
376 | #endif /* termios */ | |
377 | ||
378 | #ifdef HAVE_SGTTY | |
379 | result = ioctl (0, TIOCSPGRP, &our_process_group); | |
380 | #endif | |
381 | } | |
382 | ||
383 | #ifdef SIGTTOU | |
384 | if (job_control) | |
385 | signal (SIGTTOU, osigttou); | |
386 | #endif | |
387 | ||
388 | if (!job_control) | |
389 | { | |
390 | signal (SIGINT, sigint_ours); | |
391 | #ifdef SIGQUIT | |
392 | signal (SIGQUIT, sigquit_ours); | |
393 | #endif | |
394 | } | |
395 | ||
396 | #ifdef F_GETFL | |
397 | tflags_inferior = fcntl (0, F_GETFL, 0); | |
398 | ||
399 | /* Is there a reason this is being done twice? It happens both | |
400 | places we use F_SETFL, so I'm inclined to think perhaps there | |
401 | is some reason, however perverse. Perhaps not though... */ | |
402 | result = fcntl (0, F_SETFL, tflags_ours); | |
403 | result = fcntl (0, F_SETFL, tflags_ours); | |
404 | #endif | |
405 | ||
406 | result = result; /* lint */ | |
407 | } | |
408 | } | |
409 | ||
410 | /* ARGSUSED */ | |
411 | void | |
412 | term_info (arg, from_tty) | |
413 | char *arg; | |
414 | int from_tty; | |
415 | { | |
416 | target_terminal_info (arg, from_tty); | |
417 | } | |
418 | ||
419 | /* ARGSUSED */ | |
420 | void | |
421 | child_terminal_info (args, from_tty) | |
422 | char *args; | |
423 | int from_tty; | |
424 | { | |
425 | if (!gdb_has_a_terminal ()) | |
426 | { | |
427 | printf_filtered ("This GDB does not control a terminal.\n"); | |
428 | return; | |
429 | } | |
430 | ||
431 | printf_filtered ("Inferior's terminal status (currently saved by GDB):\n"); | |
432 | ||
433 | /* First the fcntl flags. */ | |
434 | { | |
435 | int flags; | |
436 | ||
437 | flags = tflags_inferior; | |
438 | ||
439 | printf_filtered ("File descriptor flags = "); | |
440 | ||
441 | #ifndef O_ACCMODE | |
442 | #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) | |
443 | #endif | |
444 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug */ | |
445 | switch (flags & (O_ACCMODE)) | |
446 | { | |
447 | case O_RDONLY: printf_filtered ("O_RDONLY"); break; | |
448 | case O_WRONLY: printf_filtered ("O_WRONLY"); break; | |
449 | case O_RDWR: printf_filtered ("O_RDWR"); break; | |
450 | } | |
451 | flags &= ~(O_ACCMODE); | |
452 | ||
453 | #ifdef O_NONBLOCK | |
454 | if (flags & O_NONBLOCK) | |
455 | printf_filtered (" | O_NONBLOCK"); | |
456 | flags &= ~O_NONBLOCK; | |
457 | #endif | |
458 | ||
459 | #if defined (O_NDELAY) | |
460 | /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will | |
461 | print it as O_NONBLOCK, which is good cause that is what POSIX | |
462 | has, and the flag will already be cleared by the time we get here. */ | |
463 | if (flags & O_NDELAY) | |
464 | printf_filtered (" | O_NDELAY"); | |
465 | flags &= ~O_NDELAY; | |
466 | #endif | |
467 | ||
468 | if (flags & O_APPEND) | |
469 | printf_filtered (" | O_APPEND"); | |
470 | flags &= ~O_APPEND; | |
471 | ||
472 | #if defined (O_BINARY) | |
473 | if (flags & O_BINARY) | |
474 | printf_filtered (" | O_BINARY"); | |
475 | flags &= ~O_BINARY; | |
476 | #endif | |
477 | ||
478 | if (flags) | |
479 | printf_filtered (" | 0x%x", flags); | |
480 | printf_filtered ("\n"); | |
481 | } | |
482 | ||
483 | #ifdef PROCESS_GROUP_TYPE | |
484 | printf_filtered ("Process group = %d\n", inferior_process_group); | |
485 | #endif | |
486 | ||
487 | SERIAL_PRINT_TTY_STATE (stdin_serial, inferior_ttystate); | |
488 | } | |
489 | \f | |
490 | /* NEW_TTY_PREFORK is called before forking a new child process, | |
491 | so we can record the state of ttys in the child to be formed. | |
492 | TTYNAME is null if we are to share the terminal with gdb; | |
493 | or points to a string containing the name of the desired tty. | |
494 | ||
495 | NEW_TTY is called in new child processes under Unix, which will | |
496 | become debugger target processes. This actually switches to | |
497 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
498 | ||
499 | void | |
500 | new_tty_prefork (ttyname) | |
501 | char *ttyname; | |
502 | { | |
503 | /* Save the name for later, for determining whether we and the child | |
504 | are sharing a tty. */ | |
505 | inferior_thisrun_terminal = ttyname; | |
506 | } | |
507 | ||
508 | void | |
509 | new_tty () | |
510 | { | |
511 | register int tty; | |
512 | ||
513 | if (inferior_thisrun_terminal == 0) | |
514 | return; | |
515 | #if !defined(__GO32__) && !defined(_WIN32) | |
516 | #ifdef TIOCNOTTY | |
517 | /* Disconnect the child process from our controlling terminal. On some | |
518 | systems (SVR4 for example), this may cause a SIGTTOU, so temporarily | |
519 | ignore SIGTTOU. */ | |
520 | tty = open("/dev/tty", O_RDWR); | |
521 | if (tty > 0) | |
522 | { | |
523 | void (*osigttou) (); | |
524 | ||
525 | osigttou = (void (*)()) signal(SIGTTOU, SIG_IGN); | |
526 | ioctl(tty, TIOCNOTTY, 0); | |
527 | close(tty); | |
528 | signal(SIGTTOU, osigttou); | |
529 | } | |
530 | #endif | |
531 | ||
532 | /* Now open the specified new terminal. */ | |
533 | ||
534 | #ifdef USE_O_NOCTTY | |
535 | tty = open(inferior_thisrun_terminal, O_RDWR | O_NOCTTY); | |
536 | #else | |
537 | tty = open(inferior_thisrun_terminal, O_RDWR); | |
538 | #endif | |
539 | if (tty == -1) | |
540 | { | |
541 | print_sys_errmsg (inferior_thisrun_terminal, errno); | |
542 | _exit(1); | |
543 | } | |
544 | ||
545 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
546 | if (tty != 0) | |
547 | { close (0); dup (tty); } | |
548 | if (tty != 1) | |
549 | { close (1); dup (tty); } | |
550 | if (tty != 2) | |
551 | { close (2); dup (tty); } | |
552 | if (tty > 2) | |
553 | close(tty); | |
554 | #endif /* !go32 && !win32*/ | |
555 | } | |
556 | \f | |
557 | /* Kill the inferior process. Make us have no inferior. */ | |
558 | ||
559 | /* ARGSUSED */ | |
560 | static void | |
561 | kill_command (arg, from_tty) | |
562 | char *arg; | |
563 | int from_tty; | |
564 | { | |
565 | /* FIXME: This should not really be inferior_pid (or target_has_execution). | |
566 | It should be a distinct flag that indicates that a target is active, cuz | |
567 | some targets don't have processes! */ | |
568 | ||
569 | if (inferior_pid == 0) | |
570 | error ("The program is not being run."); | |
571 | if (!query ("Kill the program being debugged? ")) | |
572 | error ("Not confirmed."); | |
573 | target_kill (); | |
574 | ||
575 | init_thread_list(); /* Destroy thread info */ | |
576 | ||
577 | /* Killing off the inferior can leave us with a core file. If so, | |
578 | print the state we are left in. */ | |
579 | if (target_has_stack) { | |
580 | printf_filtered ("In %s,\n", target_longname); | |
581 | if (selected_frame == NULL) | |
582 | fputs_filtered ("No selected stack frame.\n", gdb_stdout); | |
583 | else | |
584 | print_stack_frame (selected_frame, selected_frame_level, 1); | |
585 | } | |
586 | } | |
587 | \f | |
588 | /* Call set_sigint_trap when you need to pass a signal on to an attached | |
589 | process when handling SIGINT */ | |
590 | ||
591 | /* ARGSUSED */ | |
592 | static void | |
593 | pass_signal (signo) | |
594 | int signo; | |
595 | { | |
596 | #ifndef _WIN32 | |
597 | kill (PIDGET (inferior_pid), SIGINT); | |
598 | #endif | |
599 | } | |
600 | ||
601 | static void (*osig)(); | |
602 | ||
603 | void | |
604 | set_sigint_trap() | |
605 | { | |
606 | if (attach_flag || inferior_thisrun_terminal) | |
607 | { | |
608 | osig = (void (*) ()) signal (SIGINT, pass_signal); | |
609 | } | |
610 | } | |
611 | ||
612 | void | |
613 | clear_sigint_trap() | |
614 | { | |
615 | if (attach_flag || inferior_thisrun_terminal) | |
616 | { | |
617 | signal (SIGINT, osig); | |
618 | } | |
619 | } | |
620 | \f | |
621 | #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) | |
622 | static void (*old_sigio) (); | |
623 | ||
624 | static void | |
625 | handle_sigio (signo) | |
626 | int signo; | |
627 | { | |
628 | int numfds; | |
629 | fd_set readfds; | |
630 | ||
631 | signal (SIGIO, handle_sigio); | |
632 | ||
633 | FD_ZERO (&readfds); | |
634 | FD_SET (target_activity_fd, &readfds); | |
635 | numfds = select (target_activity_fd + 1, &readfds, NULL, NULL, NULL); | |
636 | if (numfds >= 0 && FD_ISSET (target_activity_fd, &readfds)) | |
637 | { | |
638 | #ifndef _WIN32 | |
639 | if ((*target_activity_function) ()) | |
640 | kill (inferior_pid, SIGINT); | |
641 | #endif | |
642 | } | |
643 | } | |
644 | ||
645 | static int old_fcntl_flags; | |
646 | ||
647 | void | |
648 | set_sigio_trap () | |
649 | { | |
650 | if (target_activity_function) | |
651 | { | |
652 | old_sigio = (void (*) ()) signal (SIGIO, handle_sigio); | |
653 | fcntl (target_activity_fd, F_SETOWN, getpid()); | |
654 | old_fcntl_flags = fcntl (target_activity_fd, F_GETFL, 0); | |
655 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags | FASYNC); | |
656 | } | |
657 | } | |
658 | ||
659 | void | |
660 | clear_sigio_trap () | |
661 | { | |
662 | if (target_activity_function) | |
663 | { | |
664 | signal (SIGIO, old_sigio); | |
665 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags); | |
666 | } | |
667 | } | |
668 | #else /* No SIGIO. */ | |
669 | void | |
670 | set_sigio_trap () | |
671 | { | |
672 | if (target_activity_function) | |
673 | abort (); | |
674 | } | |
675 | ||
676 | void | |
677 | clear_sigio_trap () | |
678 | { | |
679 | if (target_activity_function) | |
680 | abort (); | |
681 | } | |
682 | #endif /* No SIGIO. */ | |
683 | \f | |
684 | ||
685 | /* This is here because this is where we figure out whether we (probably) | |
686 | have job control. Just using job_control only does part of it because | |
687 | setpgid or setpgrp might not exist on a system without job control. | |
688 | It might be considered misplaced (on the other hand, process groups and | |
689 | job control are closely related to ttys). | |
690 | ||
691 | For a more clean implementation, in libiberty, put a setpgid which merely | |
692 | calls setpgrp and a setpgrp which does nothing (any system with job control | |
693 | will have one or the other). */ | |
694 | int | |
695 | gdb_setpgid () | |
696 | { | |
697 | int retval = 0; | |
698 | ||
699 | if (job_control) | |
700 | { | |
701 | #if defined (NEED_POSIX_SETPGID) || (defined (HAVE_TERMIOS) && defined (HAVE_SETPGID)) | |
702 | /* setpgid (0, 0) is supposed to work and mean the same thing as | |
703 | this, but on Ultrix 4.2A it fails with EPERM (and | |
704 | setpgid (getpid (), getpid ()) succeeds). */ | |
705 | retval = setpgid (getpid (), getpid ()); | |
706 | #else | |
707 | #if defined (TIOCGPGRP) | |
708 | #if defined(USG) && !defined(SETPGRP_ARGS) | |
709 | retval = setpgrp (); | |
710 | #else | |
711 | retval = setpgrp (getpid (), getpid ()); | |
712 | #endif /* USG */ | |
713 | #endif /* TIOCGPGRP. */ | |
714 | #endif /* NEED_POSIX_SETPGID */ | |
715 | } | |
716 | return retval; | |
717 | } | |
718 | ||
719 | void | |
720 | _initialize_inflow () | |
721 | { | |
722 | add_info ("terminal", term_info, | |
723 | "Print inferior's saved terminal status."); | |
724 | ||
725 | add_com ("kill", class_run, kill_command, | |
726 | "Kill execution of program being debugged."); | |
727 | ||
728 | inferior_pid = 0; | |
729 | ||
730 | terminal_is_ours = 1; | |
731 | ||
732 | /* OK, figure out whether we have job control. If neither termios nor | |
733 | sgtty (i.e. termio or go32), leave job_control 0. */ | |
734 | ||
735 | #if defined (HAVE_TERMIOS) | |
736 | /* Do all systems with termios have the POSIX way of identifying job | |
737 | control? I hope so. */ | |
738 | #ifdef _POSIX_JOB_CONTROL | |
739 | job_control = 1; | |
740 | #else | |
741 | #ifdef _SC_JOB_CONTROL | |
742 | job_control = sysconf (_SC_JOB_CONTROL); | |
743 | #else | |
744 | job_control = 0; /* have to assume the worst */ | |
745 | #endif /* _SC_JOB_CONTROL */ | |
746 | #endif /* _POSIX_JOB_CONTROL */ | |
747 | #endif /* HAVE_TERMIOS */ | |
748 | ||
749 | #ifdef HAVE_SGTTY | |
750 | #ifdef TIOCGPGRP | |
751 | job_control = 1; | |
752 | #else | |
753 | job_control = 0; | |
754 | #endif /* TIOCGPGRP */ | |
755 | #endif /* sgtty */ | |
756 | } |