Commit | Line | Data |
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c906108c | 1 | /* Low level interface to ptrace, for GDB when running under Unix. |
b6ba6518 KB |
2 | Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
3 | 1996, 1998, 1999, 2000, 2001 Free Software Foundation, Inc. | |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
c906108c | 11 | |
c5aa993b JM |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
c906108c | 16 | |
c5aa993b JM |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
21 | |
22 | #include "defs.h" | |
23 | #include "frame.h" | |
24 | #include "inferior.h" | |
25 | #include "command.h" | |
c906108c SS |
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 | 59 | #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) |
a14ed312 | 60 | static void handle_sigio (int); |
c906108c SS |
61 | #endif |
62 | ||
a14ed312 | 63 | extern void _initialize_inflow (void); |
392a587b | 64 | |
a14ed312 | 65 | static void pass_signal (int); |
c906108c | 66 | |
a14ed312 | 67 | static void kill_command (char *, int); |
c906108c | 68 | |
a14ed312 | 69 | static void terminal_ours_1 (int); |
c906108c SS |
70 | \f |
71 | /* Record terminal status separately for debugger and inferior. */ | |
72 | ||
819cc324 | 73 | static struct serial *stdin_serial; |
c906108c SS |
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 | ||
c5aa993b JM |
115 | enum |
116 | { | |
117 | yes, no, have_not_checked | |
118 | } | |
119 | gdb_has_a_terminal_flag = have_not_checked; | |
c906108c SS |
120 | |
121 | /* Does GDB have a terminal (on stdin)? */ | |
122 | int | |
fba45db2 | 123 | gdb_has_a_terminal (void) |
c906108c SS |
124 | { |
125 | switch (gdb_has_a_terminal_flag) | |
126 | { | |
127 | case yes: | |
128 | return 1; | |
129 | case no: | |
130 | return 0; | |
131 | case have_not_checked: | |
2cd58942 AC |
132 | /* Get all the current tty settings (including whether we have a |
133 | tty at all!). Can't do this in _initialize_inflow because | |
134 | serial_fdopen() won't work until the serial_ops_list is | |
135 | initialized. */ | |
c906108c SS |
136 | |
137 | #ifdef F_GETFL | |
138 | tflags_ours = fcntl (0, F_GETFL, 0); | |
139 | #endif | |
140 | ||
141 | gdb_has_a_terminal_flag = no; | |
2cd58942 | 142 | stdin_serial = serial_fdopen (0); |
c906108c SS |
143 | if (stdin_serial != NULL) |
144 | { | |
2cd58942 | 145 | our_ttystate = serial_get_tty_state (stdin_serial); |
c906108c SS |
146 | |
147 | if (our_ttystate != NULL) | |
148 | { | |
149 | gdb_has_a_terminal_flag = yes; | |
150 | #ifdef HAVE_TERMIOS | |
151 | our_process_group = tcgetpgrp (0); | |
152 | #endif | |
153 | #ifdef HAVE_TERMIO | |
154 | our_process_group = getpgrp (); | |
155 | #endif | |
156 | #ifdef HAVE_SGTTY | |
157 | ioctl (0, TIOCGPGRP, &our_process_group); | |
158 | #endif | |
159 | } | |
160 | } | |
161 | ||
162 | return gdb_has_a_terminal_flag == yes; | |
163 | default: | |
164 | /* "Can't happen". */ | |
165 | return 0; | |
166 | } | |
167 | } | |
168 | ||
169 | /* Macro for printing errors from ioctl operations */ | |
170 | ||
171 | #define OOPSY(what) \ | |
172 | if (result == -1) \ | |
173 | fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ | |
dc672865 | 174 | what, safe_strerror (errno)) |
c906108c | 175 | |
a14ed312 | 176 | static void terminal_ours_1 (int); |
c906108c SS |
177 | |
178 | /* Initialize the terminal settings we record for the inferior, | |
179 | before we actually run the inferior. */ | |
180 | ||
181 | void | |
fba45db2 | 182 | terminal_init_inferior_with_pgrp (int pgrp) |
c906108c SS |
183 | { |
184 | if (gdb_has_a_terminal ()) | |
185 | { | |
2cd58942 AC |
186 | /* We could just as well copy our_ttystate (if we felt like |
187 | adding a new function serial_copy_tty_state()). */ | |
c906108c | 188 | if (inferior_ttystate) |
b8c9b27d | 189 | xfree (inferior_ttystate); |
2cd58942 | 190 | inferior_ttystate = serial_get_tty_state (stdin_serial); |
c906108c SS |
191 | |
192 | #ifdef PROCESS_GROUP_TYPE | |
193 | inferior_process_group = pgrp; | |
194 | #endif | |
195 | ||
196 | /* Make sure that next time we call terminal_inferior (which will be | |
c5aa993b JM |
197 | before the program runs, as it needs to be), we install the new |
198 | process group. */ | |
c906108c SS |
199 | terminal_is_ours = 1; |
200 | } | |
201 | } | |
202 | ||
a790ad35 SC |
203 | /* Save the terminal settings again. This is necessary for the TUI |
204 | when it switches to TUI or non-TUI mode; curses changes the terminal | |
205 | and gdb must be able to restore it correctly. */ | |
206 | ||
207 | void | |
7bda5e4a | 208 | terminal_save_ours (void) |
a790ad35 SC |
209 | { |
210 | if (gdb_has_a_terminal ()) | |
211 | { | |
212 | /* We could just as well copy our_ttystate (if we felt like adding | |
213 | a new function serial_copy_tty_state). */ | |
214 | if (our_ttystate) | |
215 | xfree (our_ttystate); | |
216 | our_ttystate = serial_get_tty_state (stdin_serial); | |
217 | } | |
218 | } | |
219 | ||
c906108c | 220 | void |
fba45db2 | 221 | terminal_init_inferior (void) |
c906108c SS |
222 | { |
223 | #ifdef PROCESS_GROUP_TYPE | |
224 | /* This is for Lynx, and should be cleaned up by having Lynx be a separate | |
225 | debugging target with a version of target_terminal_init_inferior which | |
226 | passes in the process group to a generic routine which does all the work | |
227 | (and the non-threaded child_terminal_init_inferior can just pass in | |
39f77062 | 228 | inferior_ptid to the same routine). */ |
c906108c | 229 | /* We assume INFERIOR_PID is also the child's process group. */ |
39f77062 | 230 | terminal_init_inferior_with_pgrp (PIDGET (inferior_ptid)); |
c906108c SS |
231 | #endif /* PROCESS_GROUP_TYPE */ |
232 | } | |
233 | ||
234 | /* Put the inferior's terminal settings into effect. | |
235 | This is preparation for starting or resuming the inferior. */ | |
236 | ||
237 | void | |
fba45db2 | 238 | terminal_inferior (void) |
c906108c SS |
239 | { |
240 | if (gdb_has_a_terminal () && terminal_is_ours | |
241 | && inferior_thisrun_terminal == 0) | |
242 | { | |
243 | int result; | |
244 | ||
245 | #ifdef F_GETFL | |
246 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
247 | places we use F_SETFL, so I'm inclined to think perhaps there |
248 | is some reason, however perverse. Perhaps not though... */ | |
c906108c SS |
249 | result = fcntl (0, F_SETFL, tflags_inferior); |
250 | result = fcntl (0, F_SETFL, tflags_inferior); | |
251 | OOPSY ("fcntl F_SETFL"); | |
252 | #endif | |
253 | ||
254 | /* Because we were careful to not change in or out of raw mode in | |
c5aa993b JM |
255 | terminal_ours, we will not change in our out of raw mode with |
256 | this call, so we don't flush any input. */ | |
2cd58942 | 257 | result = serial_set_tty_state (stdin_serial, inferior_ttystate); |
c906108c SS |
258 | OOPSY ("setting tty state"); |
259 | ||
260 | if (!job_control) | |
261 | { | |
c5aa993b | 262 | sigint_ours = (void (*)()) signal (SIGINT, SIG_IGN); |
c906108c | 263 | #ifdef SIGQUIT |
c5aa993b | 264 | sigquit_ours = (void (*)()) signal (SIGQUIT, SIG_IGN); |
c906108c SS |
265 | #endif |
266 | } | |
267 | ||
268 | /* If attach_flag is set, we don't know whether we are sharing a | |
c5aa993b JM |
269 | terminal with the inferior or not. (attaching a process |
270 | without a terminal is one case where we do not; attaching a | |
271 | process which we ran from the same shell as GDB via `&' is | |
272 | one case where we do, I think (but perhaps this is not | |
273 | `sharing' in the sense that we need to save and restore tty | |
274 | state)). I don't know if there is any way to tell whether we | |
275 | are sharing a terminal. So what we do is to go through all | |
276 | the saving and restoring of the tty state, but ignore errors | |
277 | setting the process group, which will happen if we are not | |
278 | sharing a terminal). */ | |
c906108c SS |
279 | |
280 | if (job_control) | |
281 | { | |
282 | #ifdef HAVE_TERMIOS | |
283 | result = tcsetpgrp (0, inferior_process_group); | |
284 | if (!attach_flag) | |
285 | OOPSY ("tcsetpgrp"); | |
286 | #endif | |
287 | ||
288 | #ifdef HAVE_SGTTY | |
289 | result = ioctl (0, TIOCSPGRP, &inferior_process_group); | |
290 | if (!attach_flag) | |
291 | OOPSY ("TIOCSPGRP"); | |
292 | #endif | |
293 | } | |
294 | ||
295 | } | |
296 | terminal_is_ours = 0; | |
297 | } | |
298 | ||
299 | /* Put some of our terminal settings into effect, | |
300 | enough to get proper results from our output, | |
301 | but do not change into or out of RAW mode | |
302 | so that no input is discarded. | |
303 | ||
304 | After doing this, either terminal_ours or terminal_inferior | |
305 | should be called to get back to a normal state of affairs. */ | |
306 | ||
307 | void | |
fba45db2 | 308 | terminal_ours_for_output (void) |
c906108c SS |
309 | { |
310 | terminal_ours_1 (1); | |
311 | } | |
312 | ||
313 | /* Put our terminal settings into effect. | |
314 | First record the inferior's terminal settings | |
315 | so they can be restored properly later. */ | |
316 | ||
317 | void | |
fba45db2 | 318 | terminal_ours (void) |
c906108c SS |
319 | { |
320 | terminal_ours_1 (0); | |
321 | } | |
322 | ||
323 | /* output_only is not used, and should not be used unless we introduce | |
324 | separate terminal_is_ours and terminal_is_ours_for_output | |
325 | flags. */ | |
326 | ||
327 | static void | |
fba45db2 | 328 | terminal_ours_1 (int output_only) |
c906108c SS |
329 | { |
330 | /* Checking inferior_thisrun_terminal is necessary so that | |
331 | if GDB is running in the background, it won't block trying | |
332 | to do the ioctl()'s below. Checking gdb_has_a_terminal | |
333 | avoids attempting all the ioctl's when running in batch. */ | |
334 | if (inferior_thisrun_terminal != 0 || gdb_has_a_terminal () == 0) | |
335 | return; | |
336 | ||
337 | if (!terminal_is_ours) | |
338 | { | |
4b69c284 | 339 | #ifdef SIGTTOU |
c906108c | 340 | /* Ignore this signal since it will happen when we try to set the |
c5aa993b | 341 | pgrp. */ |
4b69c284 AC |
342 | void (*osigttou) () = NULL; |
343 | #endif | |
c906108c SS |
344 | int result; |
345 | ||
346 | terminal_is_ours = 1; | |
347 | ||
348 | #ifdef SIGTTOU | |
349 | if (job_control) | |
c5aa993b | 350 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
c906108c SS |
351 | #endif |
352 | ||
353 | if (inferior_ttystate) | |
b8c9b27d | 354 | xfree (inferior_ttystate); |
2cd58942 | 355 | inferior_ttystate = serial_get_tty_state (stdin_serial); |
c906108c SS |
356 | #ifdef HAVE_TERMIOS |
357 | inferior_process_group = tcgetpgrp (0); | |
358 | #endif | |
359 | #ifdef HAVE_TERMIO | |
360 | inferior_process_group = getpgrp (); | |
361 | #endif | |
362 | #ifdef HAVE_SGTTY | |
363 | ioctl (0, TIOCGPGRP, &inferior_process_group); | |
364 | #endif | |
365 | ||
366 | /* Here we used to set ICANON in our ttystate, but I believe this | |
c5aa993b JM |
367 | was an artifact from before when we used readline. Readline sets |
368 | the tty state when it needs to. | |
369 | FIXME-maybe: However, query() expects non-raw mode and doesn't | |
370 | use readline. Maybe query should use readline (on the other hand, | |
371 | this only matters for HAVE_SGTTY, not termio or termios, I think). */ | |
c906108c SS |
372 | |
373 | /* Set tty state to our_ttystate. We don't change in our out of raw | |
c5aa993b JM |
374 | mode, to avoid flushing input. We need to do the same thing |
375 | regardless of output_only, because we don't have separate | |
376 | terminal_is_ours and terminal_is_ours_for_output flags. It's OK, | |
377 | though, since readline will deal with raw mode when/if it needs to. | |
378 | */ | |
c906108c | 379 | |
2cd58942 | 380 | serial_noflush_set_tty_state (stdin_serial, our_ttystate, |
c906108c SS |
381 | inferior_ttystate); |
382 | ||
383 | if (job_control) | |
384 | { | |
385 | #ifdef HAVE_TERMIOS | |
386 | result = tcsetpgrp (0, our_process_group); | |
387 | #if 0 | |
388 | /* This fails on Ultrix with EINVAL if you run the testsuite | |
389 | in the background with nohup, and then log out. GDB never | |
390 | used to check for an error here, so perhaps there are other | |
391 | such situations as well. */ | |
392 | if (result == -1) | |
393 | fprintf_unfiltered (gdb_stderr, "[tcsetpgrp failed in terminal_ours: %s]\n", | |
dc672865 | 394 | safe_strerror (errno)); |
c906108c SS |
395 | #endif |
396 | #endif /* termios */ | |
397 | ||
398 | #ifdef HAVE_SGTTY | |
399 | result = ioctl (0, TIOCSPGRP, &our_process_group); | |
400 | #endif | |
401 | } | |
402 | ||
403 | #ifdef SIGTTOU | |
404 | if (job_control) | |
405 | signal (SIGTTOU, osigttou); | |
406 | #endif | |
407 | ||
408 | if (!job_control) | |
409 | { | |
410 | signal (SIGINT, sigint_ours); | |
411 | #ifdef SIGQUIT | |
412 | signal (SIGQUIT, sigquit_ours); | |
413 | #endif | |
414 | } | |
415 | ||
416 | #ifdef F_GETFL | |
417 | tflags_inferior = fcntl (0, F_GETFL, 0); | |
418 | ||
419 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
420 | places we use F_SETFL, so I'm inclined to think perhaps there |
421 | is some reason, however perverse. Perhaps not though... */ | |
c906108c SS |
422 | result = fcntl (0, F_SETFL, tflags_ours); |
423 | result = fcntl (0, F_SETFL, tflags_ours); | |
424 | #endif | |
425 | ||
c5aa993b | 426 | result = result; /* lint */ |
c906108c SS |
427 | } |
428 | } | |
429 | ||
430 | /* ARGSUSED */ | |
431 | void | |
fba45db2 | 432 | term_info (char *arg, int from_tty) |
c906108c SS |
433 | { |
434 | target_terminal_info (arg, from_tty); | |
435 | } | |
436 | ||
437 | /* ARGSUSED */ | |
438 | void | |
fba45db2 | 439 | child_terminal_info (char *args, int from_tty) |
c906108c SS |
440 | { |
441 | if (!gdb_has_a_terminal ()) | |
442 | { | |
443 | printf_filtered ("This GDB does not control a terminal.\n"); | |
444 | return; | |
445 | } | |
446 | ||
447 | printf_filtered ("Inferior's terminal status (currently saved by GDB):\n"); | |
448 | ||
449 | /* First the fcntl flags. */ | |
450 | { | |
451 | int flags; | |
c5aa993b | 452 | |
c906108c SS |
453 | flags = tflags_inferior; |
454 | ||
455 | printf_filtered ("File descriptor flags = "); | |
456 | ||
457 | #ifndef O_ACCMODE | |
458 | #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) | |
459 | #endif | |
460 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug */ | |
461 | switch (flags & (O_ACCMODE)) | |
462 | { | |
c5aa993b JM |
463 | case O_RDONLY: |
464 | printf_filtered ("O_RDONLY"); | |
465 | break; | |
466 | case O_WRONLY: | |
467 | printf_filtered ("O_WRONLY"); | |
468 | break; | |
469 | case O_RDWR: | |
470 | printf_filtered ("O_RDWR"); | |
471 | break; | |
c906108c SS |
472 | } |
473 | flags &= ~(O_ACCMODE); | |
474 | ||
475 | #ifdef O_NONBLOCK | |
c5aa993b | 476 | if (flags & O_NONBLOCK) |
c906108c SS |
477 | printf_filtered (" | O_NONBLOCK"); |
478 | flags &= ~O_NONBLOCK; | |
479 | #endif | |
c5aa993b | 480 | |
c906108c SS |
481 | #if defined (O_NDELAY) |
482 | /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will | |
483 | print it as O_NONBLOCK, which is good cause that is what POSIX | |
484 | has, and the flag will already be cleared by the time we get here. */ | |
485 | if (flags & O_NDELAY) | |
486 | printf_filtered (" | O_NDELAY"); | |
487 | flags &= ~O_NDELAY; | |
488 | #endif | |
489 | ||
490 | if (flags & O_APPEND) | |
491 | printf_filtered (" | O_APPEND"); | |
492 | flags &= ~O_APPEND; | |
493 | ||
494 | #if defined (O_BINARY) | |
495 | if (flags & O_BINARY) | |
496 | printf_filtered (" | O_BINARY"); | |
497 | flags &= ~O_BINARY; | |
498 | #endif | |
499 | ||
500 | if (flags) | |
501 | printf_filtered (" | 0x%x", flags); | |
502 | printf_filtered ("\n"); | |
503 | } | |
504 | ||
505 | #ifdef PROCESS_GROUP_TYPE | |
2acceee2 JM |
506 | printf_filtered ("Process group = %d\n", |
507 | (int) inferior_process_group); | |
c906108c SS |
508 | #endif |
509 | ||
2cd58942 | 510 | serial_print_tty_state (stdin_serial, inferior_ttystate, gdb_stdout); |
c906108c SS |
511 | } |
512 | \f | |
513 | /* NEW_TTY_PREFORK is called before forking a new child process, | |
514 | so we can record the state of ttys in the child to be formed. | |
515 | TTYNAME is null if we are to share the terminal with gdb; | |
516 | or points to a string containing the name of the desired tty. | |
517 | ||
518 | NEW_TTY is called in new child processes under Unix, which will | |
519 | become debugger target processes. This actually switches to | |
520 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
521 | ||
522 | void | |
fba45db2 | 523 | new_tty_prefork (char *ttyname) |
c906108c SS |
524 | { |
525 | /* Save the name for later, for determining whether we and the child | |
526 | are sharing a tty. */ | |
527 | inferior_thisrun_terminal = ttyname; | |
528 | } | |
529 | ||
530 | void | |
fba45db2 | 531 | new_tty (void) |
c906108c SS |
532 | { |
533 | register int tty; | |
534 | ||
535 | if (inferior_thisrun_terminal == 0) | |
536 | return; | |
537 | #if !defined(__GO32__) && !defined(_WIN32) | |
538 | #ifdef TIOCNOTTY | |
539 | /* Disconnect the child process from our controlling terminal. On some | |
540 | systems (SVR4 for example), this may cause a SIGTTOU, so temporarily | |
541 | ignore SIGTTOU. */ | |
c5aa993b | 542 | tty = open ("/dev/tty", O_RDWR); |
c906108c SS |
543 | if (tty > 0) |
544 | { | |
545 | void (*osigttou) (); | |
546 | ||
c5aa993b JM |
547 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
548 | ioctl (tty, TIOCNOTTY, 0); | |
549 | close (tty); | |
550 | signal (SIGTTOU, osigttou); | |
c906108c SS |
551 | } |
552 | #endif | |
553 | ||
554 | /* Now open the specified new terminal. */ | |
555 | ||
556 | #ifdef USE_O_NOCTTY | |
c5aa993b | 557 | tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
c906108c | 558 | #else |
c5aa993b | 559 | tty = open (inferior_thisrun_terminal, O_RDWR); |
c906108c SS |
560 | #endif |
561 | if (tty == -1) | |
562 | { | |
563 | print_sys_errmsg (inferior_thisrun_terminal, errno); | |
c5aa993b | 564 | _exit (1); |
c906108c SS |
565 | } |
566 | ||
567 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
568 | if (tty != 0) | |
c5aa993b JM |
569 | { |
570 | close (0); | |
571 | dup (tty); | |
572 | } | |
c906108c | 573 | if (tty != 1) |
c5aa993b JM |
574 | { |
575 | close (1); | |
576 | dup (tty); | |
577 | } | |
c906108c | 578 | if (tty != 2) |
c5aa993b JM |
579 | { |
580 | close (2); | |
581 | dup (tty); | |
582 | } | |
c906108c | 583 | if (tty > 2) |
c5aa993b JM |
584 | close (tty); |
585 | #endif /* !go32 && !win32 */ | |
c906108c SS |
586 | } |
587 | \f | |
588 | /* Kill the inferior process. Make us have no inferior. */ | |
589 | ||
590 | /* ARGSUSED */ | |
591 | static void | |
fba45db2 | 592 | kill_command (char *arg, int from_tty) |
c906108c | 593 | { |
39f77062 | 594 | /* FIXME: This should not really be inferior_ptid (or target_has_execution). |
c906108c SS |
595 | It should be a distinct flag that indicates that a target is active, cuz |
596 | some targets don't have processes! */ | |
597 | ||
39f77062 | 598 | if (ptid_equal (inferior_ptid, null_ptid)) |
c906108c SS |
599 | error ("The program is not being run."); |
600 | if (!query ("Kill the program being debugged? ")) | |
601 | error ("Not confirmed."); | |
602 | target_kill (); | |
603 | ||
c5aa993b | 604 | init_thread_list (); /* Destroy thread info */ |
c906108c SS |
605 | |
606 | /* Killing off the inferior can leave us with a core file. If so, | |
607 | print the state we are left in. */ | |
c5aa993b JM |
608 | if (target_has_stack) |
609 | { | |
610 | printf_filtered ("In %s,\n", target_longname); | |
611 | if (selected_frame == NULL) | |
612 | fputs_filtered ("No selected stack frame.\n", gdb_stdout); | |
613 | else | |
b31da25e AC |
614 | print_stack_frame (selected_frame, |
615 | frame_relative_level (selected_frame), 1); | |
c5aa993b | 616 | } |
c906108c SS |
617 | } |
618 | \f | |
619 | /* Call set_sigint_trap when you need to pass a signal on to an attached | |
620 | process when handling SIGINT */ | |
621 | ||
622 | /* ARGSUSED */ | |
623 | static void | |
fba45db2 | 624 | pass_signal (int signo) |
c906108c SS |
625 | { |
626 | #ifndef _WIN32 | |
39f77062 | 627 | kill (PIDGET (inferior_ptid), SIGINT); |
c906108c SS |
628 | #endif |
629 | } | |
630 | ||
c5aa993b | 631 | static void (*osig) (); |
c906108c SS |
632 | |
633 | void | |
fba45db2 | 634 | set_sigint_trap (void) |
c906108c SS |
635 | { |
636 | if (attach_flag || inferior_thisrun_terminal) | |
637 | { | |
c5aa993b | 638 | osig = (void (*)()) signal (SIGINT, pass_signal); |
c906108c SS |
639 | } |
640 | } | |
641 | ||
642 | void | |
fba45db2 | 643 | clear_sigint_trap (void) |
c906108c SS |
644 | { |
645 | if (attach_flag || inferior_thisrun_terminal) | |
646 | { | |
647 | signal (SIGINT, osig); | |
648 | } | |
649 | } | |
650 | \f | |
651 | #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) | |
652 | static void (*old_sigio) (); | |
653 | ||
654 | static void | |
fba45db2 | 655 | handle_sigio (int signo) |
c906108c SS |
656 | { |
657 | int numfds; | |
658 | fd_set readfds; | |
659 | ||
660 | signal (SIGIO, handle_sigio); | |
661 | ||
662 | FD_ZERO (&readfds); | |
663 | FD_SET (target_activity_fd, &readfds); | |
664 | numfds = select (target_activity_fd + 1, &readfds, NULL, NULL, NULL); | |
665 | if (numfds >= 0 && FD_ISSET (target_activity_fd, &readfds)) | |
666 | { | |
667 | #ifndef _WIN32 | |
668 | if ((*target_activity_function) ()) | |
39f77062 | 669 | kill (PIDGET (inferior_ptid), SIGINT); |
c906108c SS |
670 | #endif |
671 | } | |
672 | } | |
673 | ||
674 | static int old_fcntl_flags; | |
675 | ||
676 | void | |
fba45db2 | 677 | set_sigio_trap (void) |
c906108c SS |
678 | { |
679 | if (target_activity_function) | |
680 | { | |
c5aa993b JM |
681 | old_sigio = (void (*)()) signal (SIGIO, handle_sigio); |
682 | fcntl (target_activity_fd, F_SETOWN, getpid ()); | |
c906108c SS |
683 | old_fcntl_flags = fcntl (target_activity_fd, F_GETFL, 0); |
684 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags | FASYNC); | |
685 | } | |
686 | } | |
687 | ||
688 | void | |
fba45db2 | 689 | clear_sigio_trap (void) |
c906108c SS |
690 | { |
691 | if (target_activity_function) | |
692 | { | |
693 | signal (SIGIO, old_sigio); | |
694 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags); | |
695 | } | |
696 | } | |
697 | #else /* No SIGIO. */ | |
698 | void | |
fba45db2 | 699 | set_sigio_trap (void) |
c906108c SS |
700 | { |
701 | if (target_activity_function) | |
e1e9e218 | 702 | internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
c906108c SS |
703 | } |
704 | ||
705 | void | |
fba45db2 | 706 | clear_sigio_trap (void) |
c906108c SS |
707 | { |
708 | if (target_activity_function) | |
e1e9e218 | 709 | internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
c906108c SS |
710 | } |
711 | #endif /* No SIGIO. */ | |
712 | \f | |
713 | ||
714 | /* This is here because this is where we figure out whether we (probably) | |
715 | have job control. Just using job_control only does part of it because | |
716 | setpgid or setpgrp might not exist on a system without job control. | |
717 | It might be considered misplaced (on the other hand, process groups and | |
718 | job control are closely related to ttys). | |
719 | ||
720 | For a more clean implementation, in libiberty, put a setpgid which merely | |
721 | calls setpgrp and a setpgrp which does nothing (any system with job control | |
722 | will have one or the other). */ | |
723 | int | |
fba45db2 | 724 | gdb_setpgid (void) |
c906108c SS |
725 | { |
726 | int retval = 0; | |
727 | ||
728 | if (job_control) | |
729 | { | |
0200359f MK |
730 | #if defined (HAVE_TERMIOS) || defined (TIOCGPGRP) |
731 | #ifdef HAVE_SETPGID | |
732 | /* The call setpgid (0, 0) is supposed to work and mean the same | |
733 | thing as this, but on Ultrix 4.2A it fails with EPERM (and | |
c5aa993b | 734 | setpgid (getpid (), getpid ()) succeeds). */ |
c906108c SS |
735 | retval = setpgid (getpid (), getpid ()); |
736 | #else | |
0200359f MK |
737 | #ifdef HAVE_SETPGRP |
738 | #ifdef SETPGRP_VOID | |
c906108c SS |
739 | retval = setpgrp (); |
740 | #else | |
741 | retval = setpgrp (getpid (), getpid ()); | |
0200359f MK |
742 | #endif |
743 | #endif /* HAVE_SETPGRP */ | |
744 | #endif /* HAVE_SETPGID */ | |
745 | #endif /* defined (HAVE_TERMIOS) || defined (TIOCGPGRP) */ | |
c906108c | 746 | } |
0200359f | 747 | |
c906108c SS |
748 | return retval; |
749 | } | |
750 | ||
751 | void | |
fba45db2 | 752 | _initialize_inflow (void) |
c906108c SS |
753 | { |
754 | add_info ("terminal", term_info, | |
c5aa993b | 755 | "Print inferior's saved terminal status."); |
c906108c SS |
756 | |
757 | add_com ("kill", class_run, kill_command, | |
758 | "Kill execution of program being debugged."); | |
759 | ||
39f77062 | 760 | inferior_ptid = null_ptid; |
c906108c SS |
761 | |
762 | terminal_is_ours = 1; | |
763 | ||
764 | /* OK, figure out whether we have job control. If neither termios nor | |
765 | sgtty (i.e. termio or go32), leave job_control 0. */ | |
766 | ||
767 | #if defined (HAVE_TERMIOS) | |
768 | /* Do all systems with termios have the POSIX way of identifying job | |
769 | control? I hope so. */ | |
770 | #ifdef _POSIX_JOB_CONTROL | |
771 | job_control = 1; | |
772 | #else | |
773 | #ifdef _SC_JOB_CONTROL | |
774 | job_control = sysconf (_SC_JOB_CONTROL); | |
775 | #else | |
c5aa993b JM |
776 | job_control = 0; /* have to assume the worst */ |
777 | #endif /* _SC_JOB_CONTROL */ | |
778 | #endif /* _POSIX_JOB_CONTROL */ | |
779 | #endif /* HAVE_TERMIOS */ | |
c906108c SS |
780 | |
781 | #ifdef HAVE_SGTTY | |
782 | #ifdef TIOCGPGRP | |
783 | job_control = 1; | |
784 | #else | |
785 | job_control = 0; | |
786 | #endif /* TIOCGPGRP */ | |
787 | #endif /* sgtty */ | |
788 | } |