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