Commit | Line | Data |
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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" | |
c906108c SS |
25 | #include "serial.h" |
26 | #include "terminal.h" | |
27 | #include "target.h" | |
28 | #include "gdbthread.h" | |
29 | ||
30 | #include "gdb_string.h" | |
31 | #include <signal.h> | |
32 | #include <fcntl.h> | |
7a292a7a SS |
33 | #ifdef HAVE_SYS_SELECT_H |
34 | #include <sys/select.h> | |
35 | #endif | |
c906108c SS |
36 | |
37 | #ifdef HAVE_TERMIOS | |
38 | #define PROCESS_GROUP_TYPE pid_t | |
39 | #endif | |
40 | ||
41 | #ifdef HAVE_TERMIO | |
42 | #define PROCESS_GROUP_TYPE int | |
43 | #endif | |
44 | ||
45 | #ifdef HAVE_SGTTY | |
46 | #ifdef SHORT_PGRP | |
47 | /* This is only used for the ultra. Does it have pid_t? */ | |
48 | #define PROCESS_GROUP_TYPE short | |
49 | #else | |
50 | #define PROCESS_GROUP_TYPE int | |
51 | #endif | |
52 | #endif /* sgtty */ | |
53 | ||
c2d11a7d JM |
54 | #ifdef HAVE_SYS_IOCTL_H |
55 | #include <sys/ioctl.h> | |
56 | #endif | |
57 | ||
c906108c | 58 | #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) |
a14ed312 | 59 | static void handle_sigio (int); |
c906108c SS |
60 | #endif |
61 | ||
a14ed312 | 62 | extern void _initialize_inflow (void); |
392a587b | 63 | |
a14ed312 | 64 | static void pass_signal (int); |
c906108c | 65 | |
a14ed312 | 66 | static void kill_command (char *, int); |
c906108c | 67 | |
a14ed312 | 68 | static void terminal_ours_1 (int); |
c906108c SS |
69 | \f |
70 | /* Record terminal status separately for debugger and inferior. */ | |
71 | ||
72 | static serial_t stdin_serial; | |
73 | ||
74 | /* TTY state for the inferior. We save it whenever the inferior stops, and | |
75 | restore it when it resumes. */ | |
76 | static serial_ttystate inferior_ttystate; | |
77 | ||
78 | /* Our own tty state, which we restore every time we need to deal with the | |
79 | terminal. We only set it once, when GDB first starts. The settings of | |
80 | flags which readline saves and restores and unimportant. */ | |
81 | static serial_ttystate our_ttystate; | |
82 | ||
83 | /* fcntl flags for us and the inferior. Saved and restored just like | |
84 | {our,inferior}_ttystate. */ | |
85 | static int tflags_inferior; | |
86 | static int tflags_ours; | |
87 | ||
88 | #ifdef PROCESS_GROUP_TYPE | |
89 | /* Process group for us and the inferior. Saved and restored just like | |
90 | {our,inferior}_ttystate. */ | |
91 | PROCESS_GROUP_TYPE our_process_group; | |
92 | PROCESS_GROUP_TYPE inferior_process_group; | |
93 | #endif | |
94 | ||
95 | /* While the inferior is running, we want SIGINT and SIGQUIT to go to the | |
96 | inferior only. If we have job control, that takes care of it. If not, | |
97 | we save our handlers in these two variables and set SIGINT and SIGQUIT | |
98 | to SIG_IGN. */ | |
99 | ||
100 | static void (*sigint_ours) (); | |
101 | static void (*sigquit_ours) (); | |
102 | ||
103 | /* The name of the tty (from the `tty' command) that we gave to the inferior | |
104 | when it was last started. */ | |
105 | ||
106 | static char *inferior_thisrun_terminal; | |
107 | ||
108 | /* Nonzero if our terminal settings are in effect. Zero if the | |
109 | inferior's settings are in effect. Ignored if !gdb_has_a_terminal | |
110 | (). */ | |
111 | ||
112 | int terminal_is_ours; | |
113 | ||
c5aa993b JM |
114 | enum |
115 | { | |
116 | yes, no, have_not_checked | |
117 | } | |
118 | gdb_has_a_terminal_flag = have_not_checked; | |
c906108c SS |
119 | |
120 | /* Does GDB have a terminal (on stdin)? */ | |
121 | int | |
fba45db2 | 122 | gdb_has_a_terminal (void) |
c906108c SS |
123 | { |
124 | switch (gdb_has_a_terminal_flag) | |
125 | { | |
126 | case yes: | |
127 | return 1; | |
128 | case no: | |
129 | return 0; | |
130 | case have_not_checked: | |
131 | /* Get all the current tty settings (including whether we have a tty at | |
c5aa993b JM |
132 | all!). Can't do this in _initialize_inflow because SERIAL_FDOPEN |
133 | won't work until the serial_ops_list is initialized. */ | |
c906108c SS |
134 | |
135 | #ifdef F_GETFL | |
136 | tflags_ours = fcntl (0, F_GETFL, 0); | |
137 | #endif | |
138 | ||
139 | gdb_has_a_terminal_flag = no; | |
140 | stdin_serial = SERIAL_FDOPEN (0); | |
141 | if (stdin_serial != NULL) | |
142 | { | |
143 | our_ttystate = SERIAL_GET_TTY_STATE (stdin_serial); | |
144 | ||
145 | if (our_ttystate != NULL) | |
146 | { | |
147 | gdb_has_a_terminal_flag = yes; | |
148 | #ifdef HAVE_TERMIOS | |
149 | our_process_group = tcgetpgrp (0); | |
150 | #endif | |
151 | #ifdef HAVE_TERMIO | |
152 | our_process_group = getpgrp (); | |
153 | #endif | |
154 | #ifdef HAVE_SGTTY | |
155 | ioctl (0, TIOCGPGRP, &our_process_group); | |
156 | #endif | |
157 | } | |
158 | } | |
159 | ||
160 | return gdb_has_a_terminal_flag == yes; | |
161 | default: | |
162 | /* "Can't happen". */ | |
163 | return 0; | |
164 | } | |
165 | } | |
166 | ||
167 | /* Macro for printing errors from ioctl operations */ | |
168 | ||
169 | #define OOPSY(what) \ | |
170 | if (result == -1) \ | |
171 | fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ | |
172 | what, strerror (errno)) | |
173 | ||
a14ed312 | 174 | static void terminal_ours_1 (int); |
c906108c SS |
175 | |
176 | /* Initialize the terminal settings we record for the inferior, | |
177 | before we actually run the inferior. */ | |
178 | ||
179 | void | |
fba45db2 | 180 | terminal_init_inferior_with_pgrp (int pgrp) |
c906108c SS |
181 | { |
182 | if (gdb_has_a_terminal ()) | |
183 | { | |
184 | /* We could just as well copy our_ttystate (if we felt like adding | |
c5aa993b | 185 | a new function SERIAL_COPY_TTY_STATE). */ |
c906108c | 186 | if (inferior_ttystate) |
b8c9b27d | 187 | xfree (inferior_ttystate); |
c906108c SS |
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 | |
c5aa993b JM |
195 | before the program runs, as it needs to be), we install the new |
196 | process group. */ | |
c906108c SS |
197 | terminal_is_ours = 1; |
198 | } | |
199 | } | |
200 | ||
201 | void | |
fba45db2 | 202 | terminal_init_inferior (void) |
c906108c SS |
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 | |
fba45db2 | 219 | terminal_inferior (void) |
c906108c SS |
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 | |
c5aa993b JM |
228 | places we use F_SETFL, so I'm inclined to think perhaps there |
229 | is some reason, however perverse. Perhaps not though... */ | |
c906108c SS |
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 | |
c5aa993b JM |
236 | terminal_ours, we will not change in our out of raw mode with |
237 | this call, so we don't flush any input. */ | |
c906108c SS |
238 | result = SERIAL_SET_TTY_STATE (stdin_serial, inferior_ttystate); |
239 | OOPSY ("setting tty state"); | |
240 | ||
241 | if (!job_control) | |
242 | { | |
c5aa993b | 243 | sigint_ours = (void (*)()) signal (SIGINT, SIG_IGN); |
c906108c | 244 | #ifdef SIGQUIT |
c5aa993b | 245 | sigquit_ours = (void (*)()) signal (SIGQUIT, SIG_IGN); |
c906108c SS |
246 | #endif |
247 | } | |
248 | ||
249 | /* If attach_flag is set, we don't know whether we are sharing a | |
c5aa993b JM |
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). */ | |
c906108c SS |
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 | |
fba45db2 | 289 | terminal_ours_for_output (void) |
c906108c SS |
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 | |
fba45db2 | 299 | terminal_ours (void) |
c906108c SS |
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 | |
fba45db2 | 309 | terminal_ours_1 (int output_only) |
c906108c SS |
310 | { |
311 | /* Checking inferior_thisrun_terminal is necessary so that | |
312 | if GDB is running in the background, it won't block trying | |
313 | to do the ioctl()'s below. Checking gdb_has_a_terminal | |
314 | avoids attempting all the ioctl's when running in batch. */ | |
315 | if (inferior_thisrun_terminal != 0 || gdb_has_a_terminal () == 0) | |
316 | return; | |
317 | ||
318 | if (!terminal_is_ours) | |
319 | { | |
320 | /* Ignore this signal since it will happen when we try to set the | |
c5aa993b | 321 | pgrp. */ |
c906108c SS |
322 | void (*osigttou) (); |
323 | int result; | |
324 | ||
325 | terminal_is_ours = 1; | |
326 | ||
327 | #ifdef SIGTTOU | |
328 | if (job_control) | |
c5aa993b | 329 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
c906108c SS |
330 | #endif |
331 | ||
332 | if (inferior_ttystate) | |
b8c9b27d | 333 | xfree (inferior_ttystate); |
c906108c SS |
334 | inferior_ttystate = SERIAL_GET_TTY_STATE (stdin_serial); |
335 | #ifdef HAVE_TERMIOS | |
336 | inferior_process_group = tcgetpgrp (0); | |
337 | #endif | |
338 | #ifdef HAVE_TERMIO | |
339 | inferior_process_group = getpgrp (); | |
340 | #endif | |
341 | #ifdef HAVE_SGTTY | |
342 | ioctl (0, TIOCGPGRP, &inferior_process_group); | |
343 | #endif | |
344 | ||
345 | /* Here we used to set ICANON in our ttystate, but I believe this | |
c5aa993b JM |
346 | was an artifact from before when we used readline. Readline sets |
347 | the tty state when it needs to. | |
348 | FIXME-maybe: However, query() expects non-raw mode and doesn't | |
349 | use readline. Maybe query should use readline (on the other hand, | |
350 | this only matters for HAVE_SGTTY, not termio or termios, I think). */ | |
c906108c SS |
351 | |
352 | /* Set tty state to our_ttystate. We don't change in our out of raw | |
c5aa993b JM |
353 | mode, to avoid flushing input. We need to do the same thing |
354 | regardless of output_only, because we don't have separate | |
355 | terminal_is_ours and terminal_is_ours_for_output flags. It's OK, | |
356 | though, since readline will deal with raw mode when/if it needs to. | |
357 | */ | |
c906108c SS |
358 | |
359 | SERIAL_NOFLUSH_SET_TTY_STATE (stdin_serial, our_ttystate, | |
360 | inferior_ttystate); | |
361 | ||
362 | if (job_control) | |
363 | { | |
364 | #ifdef HAVE_TERMIOS | |
365 | result = tcsetpgrp (0, our_process_group); | |
366 | #if 0 | |
367 | /* This fails on Ultrix with EINVAL if you run the testsuite | |
368 | in the background with nohup, and then log out. GDB never | |
369 | used to check for an error here, so perhaps there are other | |
370 | such situations as well. */ | |
371 | if (result == -1) | |
372 | fprintf_unfiltered (gdb_stderr, "[tcsetpgrp failed in terminal_ours: %s]\n", | |
c5aa993b | 373 | strerror (errno)); |
c906108c SS |
374 | #endif |
375 | #endif /* termios */ | |
376 | ||
377 | #ifdef HAVE_SGTTY | |
378 | result = ioctl (0, TIOCSPGRP, &our_process_group); | |
379 | #endif | |
380 | } | |
381 | ||
382 | #ifdef SIGTTOU | |
383 | if (job_control) | |
384 | signal (SIGTTOU, osigttou); | |
385 | #endif | |
386 | ||
387 | if (!job_control) | |
388 | { | |
389 | signal (SIGINT, sigint_ours); | |
390 | #ifdef SIGQUIT | |
391 | signal (SIGQUIT, sigquit_ours); | |
392 | #endif | |
393 | } | |
394 | ||
395 | #ifdef F_GETFL | |
396 | tflags_inferior = fcntl (0, F_GETFL, 0); | |
397 | ||
398 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
399 | places we use F_SETFL, so I'm inclined to think perhaps there |
400 | is some reason, however perverse. Perhaps not though... */ | |
c906108c SS |
401 | result = fcntl (0, F_SETFL, tflags_ours); |
402 | result = fcntl (0, F_SETFL, tflags_ours); | |
403 | #endif | |
404 | ||
c5aa993b | 405 | result = result; /* lint */ |
c906108c SS |
406 | } |
407 | } | |
408 | ||
409 | /* ARGSUSED */ | |
410 | void | |
fba45db2 | 411 | term_info (char *arg, int from_tty) |
c906108c SS |
412 | { |
413 | target_terminal_info (arg, from_tty); | |
414 | } | |
415 | ||
416 | /* ARGSUSED */ | |
417 | void | |
fba45db2 | 418 | child_terminal_info (char *args, int from_tty) |
c906108c SS |
419 | { |
420 | if (!gdb_has_a_terminal ()) | |
421 | { | |
422 | printf_filtered ("This GDB does not control a terminal.\n"); | |
423 | return; | |
424 | } | |
425 | ||
426 | printf_filtered ("Inferior's terminal status (currently saved by GDB):\n"); | |
427 | ||
428 | /* First the fcntl flags. */ | |
429 | { | |
430 | int flags; | |
c5aa993b | 431 | |
c906108c SS |
432 | flags = tflags_inferior; |
433 | ||
434 | printf_filtered ("File descriptor flags = "); | |
435 | ||
436 | #ifndef O_ACCMODE | |
437 | #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) | |
438 | #endif | |
439 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug */ | |
440 | switch (flags & (O_ACCMODE)) | |
441 | { | |
c5aa993b JM |
442 | case O_RDONLY: |
443 | printf_filtered ("O_RDONLY"); | |
444 | break; | |
445 | case O_WRONLY: | |
446 | printf_filtered ("O_WRONLY"); | |
447 | break; | |
448 | case O_RDWR: | |
449 | printf_filtered ("O_RDWR"); | |
450 | break; | |
c906108c SS |
451 | } |
452 | flags &= ~(O_ACCMODE); | |
453 | ||
454 | #ifdef O_NONBLOCK | |
c5aa993b | 455 | if (flags & O_NONBLOCK) |
c906108c SS |
456 | printf_filtered (" | O_NONBLOCK"); |
457 | flags &= ~O_NONBLOCK; | |
458 | #endif | |
c5aa993b | 459 | |
c906108c SS |
460 | #if defined (O_NDELAY) |
461 | /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will | |
462 | print it as O_NONBLOCK, which is good cause that is what POSIX | |
463 | has, and the flag will already be cleared by the time we get here. */ | |
464 | if (flags & O_NDELAY) | |
465 | printf_filtered (" | O_NDELAY"); | |
466 | flags &= ~O_NDELAY; | |
467 | #endif | |
468 | ||
469 | if (flags & O_APPEND) | |
470 | printf_filtered (" | O_APPEND"); | |
471 | flags &= ~O_APPEND; | |
472 | ||
473 | #if defined (O_BINARY) | |
474 | if (flags & O_BINARY) | |
475 | printf_filtered (" | O_BINARY"); | |
476 | flags &= ~O_BINARY; | |
477 | #endif | |
478 | ||
479 | if (flags) | |
480 | printf_filtered (" | 0x%x", flags); | |
481 | printf_filtered ("\n"); | |
482 | } | |
483 | ||
484 | #ifdef PROCESS_GROUP_TYPE | |
2acceee2 JM |
485 | printf_filtered ("Process group = %d\n", |
486 | (int) inferior_process_group); | |
c906108c SS |
487 | #endif |
488 | ||
c2c6d25f | 489 | SERIAL_PRINT_TTY_STATE (stdin_serial, inferior_ttystate, gdb_stdout); |
c906108c SS |
490 | } |
491 | \f | |
492 | /* NEW_TTY_PREFORK is called before forking a new child process, | |
493 | so we can record the state of ttys in the child to be formed. | |
494 | TTYNAME is null if we are to share the terminal with gdb; | |
495 | or points to a string containing the name of the desired tty. | |
496 | ||
497 | NEW_TTY is called in new child processes under Unix, which will | |
498 | become debugger target processes. This actually switches to | |
499 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
500 | ||
501 | void | |
fba45db2 | 502 | new_tty_prefork (char *ttyname) |
c906108c SS |
503 | { |
504 | /* Save the name for later, for determining whether we and the child | |
505 | are sharing a tty. */ | |
506 | inferior_thisrun_terminal = ttyname; | |
507 | } | |
508 | ||
509 | void | |
fba45db2 | 510 | new_tty (void) |
c906108c SS |
511 | { |
512 | register int tty; | |
513 | ||
514 | if (inferior_thisrun_terminal == 0) | |
515 | return; | |
516 | #if !defined(__GO32__) && !defined(_WIN32) | |
517 | #ifdef TIOCNOTTY | |
518 | /* Disconnect the child process from our controlling terminal. On some | |
519 | systems (SVR4 for example), this may cause a SIGTTOU, so temporarily | |
520 | ignore SIGTTOU. */ | |
c5aa993b | 521 | tty = open ("/dev/tty", O_RDWR); |
c906108c SS |
522 | if (tty > 0) |
523 | { | |
524 | void (*osigttou) (); | |
525 | ||
c5aa993b JM |
526 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
527 | ioctl (tty, TIOCNOTTY, 0); | |
528 | close (tty); | |
529 | signal (SIGTTOU, osigttou); | |
c906108c SS |
530 | } |
531 | #endif | |
532 | ||
533 | /* Now open the specified new terminal. */ | |
534 | ||
535 | #ifdef USE_O_NOCTTY | |
c5aa993b | 536 | tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
c906108c | 537 | #else |
c5aa993b | 538 | tty = open (inferior_thisrun_terminal, O_RDWR); |
c906108c SS |
539 | #endif |
540 | if (tty == -1) | |
541 | { | |
542 | print_sys_errmsg (inferior_thisrun_terminal, errno); | |
c5aa993b | 543 | _exit (1); |
c906108c SS |
544 | } |
545 | ||
546 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
547 | if (tty != 0) | |
c5aa993b JM |
548 | { |
549 | close (0); | |
550 | dup (tty); | |
551 | } | |
c906108c | 552 | if (tty != 1) |
c5aa993b JM |
553 | { |
554 | close (1); | |
555 | dup (tty); | |
556 | } | |
c906108c | 557 | if (tty != 2) |
c5aa993b JM |
558 | { |
559 | close (2); | |
560 | dup (tty); | |
561 | } | |
c906108c | 562 | if (tty > 2) |
c5aa993b JM |
563 | close (tty); |
564 | #endif /* !go32 && !win32 */ | |
c906108c SS |
565 | } |
566 | \f | |
567 | /* Kill the inferior process. Make us have no inferior. */ | |
568 | ||
569 | /* ARGSUSED */ | |
570 | static void | |
fba45db2 | 571 | kill_command (char *arg, int from_tty) |
c906108c SS |
572 | { |
573 | /* FIXME: This should not really be inferior_pid (or target_has_execution). | |
574 | It should be a distinct flag that indicates that a target is active, cuz | |
575 | some targets don't have processes! */ | |
576 | ||
577 | if (inferior_pid == 0) | |
578 | error ("The program is not being run."); | |
579 | if (!query ("Kill the program being debugged? ")) | |
580 | error ("Not confirmed."); | |
581 | target_kill (); | |
582 | ||
c5aa993b | 583 | init_thread_list (); /* Destroy thread info */ |
c906108c SS |
584 | |
585 | /* Killing off the inferior can leave us with a core file. If so, | |
586 | print the state we are left in. */ | |
c5aa993b JM |
587 | if (target_has_stack) |
588 | { | |
589 | printf_filtered ("In %s,\n", target_longname); | |
590 | if (selected_frame == NULL) | |
591 | fputs_filtered ("No selected stack frame.\n", gdb_stdout); | |
592 | else | |
593 | print_stack_frame (selected_frame, selected_frame_level, 1); | |
594 | } | |
c906108c SS |
595 | } |
596 | \f | |
597 | /* Call set_sigint_trap when you need to pass a signal on to an attached | |
598 | process when handling SIGINT */ | |
599 | ||
600 | /* ARGSUSED */ | |
601 | static void | |
fba45db2 | 602 | pass_signal (int signo) |
c906108c SS |
603 | { |
604 | #ifndef _WIN32 | |
605 | kill (PIDGET (inferior_pid), SIGINT); | |
606 | #endif | |
607 | } | |
608 | ||
c5aa993b | 609 | static void (*osig) (); |
c906108c SS |
610 | |
611 | void | |
fba45db2 | 612 | set_sigint_trap (void) |
c906108c SS |
613 | { |
614 | if (attach_flag || inferior_thisrun_terminal) | |
615 | { | |
c5aa993b | 616 | osig = (void (*)()) signal (SIGINT, pass_signal); |
c906108c SS |
617 | } |
618 | } | |
619 | ||
620 | void | |
fba45db2 | 621 | clear_sigint_trap (void) |
c906108c SS |
622 | { |
623 | if (attach_flag || inferior_thisrun_terminal) | |
624 | { | |
625 | signal (SIGINT, osig); | |
626 | } | |
627 | } | |
628 | \f | |
629 | #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) | |
630 | static void (*old_sigio) (); | |
631 | ||
632 | static void | |
fba45db2 | 633 | handle_sigio (int signo) |
c906108c SS |
634 | { |
635 | int numfds; | |
636 | fd_set readfds; | |
637 | ||
638 | signal (SIGIO, handle_sigio); | |
639 | ||
640 | FD_ZERO (&readfds); | |
641 | FD_SET (target_activity_fd, &readfds); | |
642 | numfds = select (target_activity_fd + 1, &readfds, NULL, NULL, NULL); | |
643 | if (numfds >= 0 && FD_ISSET (target_activity_fd, &readfds)) | |
644 | { | |
645 | #ifndef _WIN32 | |
646 | if ((*target_activity_function) ()) | |
647 | kill (inferior_pid, SIGINT); | |
648 | #endif | |
649 | } | |
650 | } | |
651 | ||
652 | static int old_fcntl_flags; | |
653 | ||
654 | void | |
fba45db2 | 655 | set_sigio_trap (void) |
c906108c SS |
656 | { |
657 | if (target_activity_function) | |
658 | { | |
c5aa993b JM |
659 | old_sigio = (void (*)()) signal (SIGIO, handle_sigio); |
660 | fcntl (target_activity_fd, F_SETOWN, getpid ()); | |
c906108c SS |
661 | old_fcntl_flags = fcntl (target_activity_fd, F_GETFL, 0); |
662 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags | FASYNC); | |
663 | } | |
664 | } | |
665 | ||
666 | void | |
fba45db2 | 667 | clear_sigio_trap (void) |
c906108c SS |
668 | { |
669 | if (target_activity_function) | |
670 | { | |
671 | signal (SIGIO, old_sigio); | |
672 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags); | |
673 | } | |
674 | } | |
675 | #else /* No SIGIO. */ | |
676 | void | |
fba45db2 | 677 | set_sigio_trap (void) |
c906108c SS |
678 | { |
679 | if (target_activity_function) | |
680 | abort (); | |
681 | } | |
682 | ||
683 | void | |
fba45db2 | 684 | clear_sigio_trap (void) |
c906108c SS |
685 | { |
686 | if (target_activity_function) | |
687 | abort (); | |
688 | } | |
689 | #endif /* No SIGIO. */ | |
690 | \f | |
691 | ||
692 | /* This is here because this is where we figure out whether we (probably) | |
693 | have job control. Just using job_control only does part of it because | |
694 | setpgid or setpgrp might not exist on a system without job control. | |
695 | It might be considered misplaced (on the other hand, process groups and | |
696 | job control are closely related to ttys). | |
697 | ||
698 | For a more clean implementation, in libiberty, put a setpgid which merely | |
699 | calls setpgrp and a setpgrp which does nothing (any system with job control | |
700 | will have one or the other). */ | |
701 | int | |
fba45db2 | 702 | gdb_setpgid (void) |
c906108c SS |
703 | { |
704 | int retval = 0; | |
705 | ||
706 | if (job_control) | |
707 | { | |
708 | #if defined (NEED_POSIX_SETPGID) || (defined (HAVE_TERMIOS) && defined (HAVE_SETPGID)) | |
709 | /* setpgid (0, 0) is supposed to work and mean the same thing as | |
c5aa993b JM |
710 | this, but on Ultrix 4.2A it fails with EPERM (and |
711 | setpgid (getpid (), getpid ()) succeeds). */ | |
c906108c SS |
712 | retval = setpgid (getpid (), getpid ()); |
713 | #else | |
714 | #if defined (TIOCGPGRP) | |
715 | #if defined(USG) && !defined(SETPGRP_ARGS) | |
716 | retval = setpgrp (); | |
717 | #else | |
718 | retval = setpgrp (getpid (), getpid ()); | |
719 | #endif /* USG */ | |
720 | #endif /* TIOCGPGRP. */ | |
721 | #endif /* NEED_POSIX_SETPGID */ | |
722 | } | |
723 | return retval; | |
724 | } | |
725 | ||
726 | void | |
fba45db2 | 727 | _initialize_inflow (void) |
c906108c SS |
728 | { |
729 | add_info ("terminal", term_info, | |
c5aa993b | 730 | "Print inferior's saved terminal status."); |
c906108c SS |
731 | |
732 | add_com ("kill", class_run, kill_command, | |
733 | "Kill execution of program being debugged."); | |
734 | ||
735 | inferior_pid = 0; | |
736 | ||
737 | terminal_is_ours = 1; | |
738 | ||
739 | /* OK, figure out whether we have job control. If neither termios nor | |
740 | sgtty (i.e. termio or go32), leave job_control 0. */ | |
741 | ||
742 | #if defined (HAVE_TERMIOS) | |
743 | /* Do all systems with termios have the POSIX way of identifying job | |
744 | control? I hope so. */ | |
745 | #ifdef _POSIX_JOB_CONTROL | |
746 | job_control = 1; | |
747 | #else | |
748 | #ifdef _SC_JOB_CONTROL | |
749 | job_control = sysconf (_SC_JOB_CONTROL); | |
750 | #else | |
c5aa993b JM |
751 | job_control = 0; /* have to assume the worst */ |
752 | #endif /* _SC_JOB_CONTROL */ | |
753 | #endif /* _POSIX_JOB_CONTROL */ | |
754 | #endif /* HAVE_TERMIOS */ | |
c906108c SS |
755 | |
756 | #ifdef HAVE_SGTTY | |
757 | #ifdef TIOCGPGRP | |
758 | job_control = 1; | |
759 | #else | |
760 | job_control = 0; | |
761 | #endif /* TIOCGPGRP */ | |
762 | #endif /* sgtty */ | |
763 | } |