Commit | Line | Data |
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c906108c | 1 | /* Low level interface to ptrace, for GDB when running under Unix. |
b6ba6518 | 2 | Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
2da6aac3 DJ |
3 | 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004 |
4 | Free Software Foundation, Inc. | |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b JM |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "frame.h" | |
25 | #include "inferior.h" | |
26 | #include "command.h" | |
c906108c SS |
27 | #include "serial.h" |
28 | #include "terminal.h" | |
29 | #include "target.h" | |
30 | #include "gdbthread.h" | |
31 | ||
32 | #include "gdb_string.h" | |
33 | #include <signal.h> | |
34 | #include <fcntl.h> | |
7a292a7a SS |
35 | #ifdef HAVE_SYS_SELECT_H |
36 | #include <sys/select.h> | |
37 | #endif | |
c906108c | 38 | |
44270758 | 39 | #include "inflow.h" |
c906108c | 40 | |
c2d11a7d JM |
41 | #ifdef HAVE_SYS_IOCTL_H |
42 | #include <sys/ioctl.h> | |
43 | #endif | |
44 | ||
c906108c | 45 | #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) |
a14ed312 | 46 | static void handle_sigio (int); |
c906108c SS |
47 | #endif |
48 | ||
a14ed312 | 49 | extern void _initialize_inflow (void); |
392a587b | 50 | |
a14ed312 | 51 | static void pass_signal (int); |
c906108c | 52 | |
a14ed312 | 53 | static void kill_command (char *, int); |
c906108c | 54 | |
a14ed312 | 55 | static void terminal_ours_1 (int); |
c906108c SS |
56 | \f |
57 | /* Record terminal status separately for debugger and inferior. */ | |
58 | ||
819cc324 | 59 | static struct serial *stdin_serial; |
c906108c SS |
60 | |
61 | /* TTY state for the inferior. We save it whenever the inferior stops, and | |
62 | restore it when it resumes. */ | |
63 | static serial_ttystate inferior_ttystate; | |
64 | ||
65 | /* Our own tty state, which we restore every time we need to deal with the | |
66 | terminal. We only set it once, when GDB first starts. The settings of | |
67 | flags which readline saves and restores and unimportant. */ | |
68 | static serial_ttystate our_ttystate; | |
69 | ||
70 | /* fcntl flags for us and the inferior. Saved and restored just like | |
71 | {our,inferior}_ttystate. */ | |
72 | static int tflags_inferior; | |
73 | static int tflags_ours; | |
74 | ||
75 | #ifdef PROCESS_GROUP_TYPE | |
76 | /* Process group for us and the inferior. Saved and restored just like | |
77 | {our,inferior}_ttystate. */ | |
78 | PROCESS_GROUP_TYPE our_process_group; | |
79 | PROCESS_GROUP_TYPE inferior_process_group; | |
80 | #endif | |
81 | ||
82 | /* While the inferior is running, we want SIGINT and SIGQUIT to go to the | |
83 | inferior only. If we have job control, that takes care of it. If not, | |
84 | we save our handlers in these two variables and set SIGINT and SIGQUIT | |
85 | to SIG_IGN. */ | |
86 | ||
87 | static void (*sigint_ours) (); | |
88 | static void (*sigquit_ours) (); | |
89 | ||
90 | /* The name of the tty (from the `tty' command) that we gave to the inferior | |
91 | when it was last started. */ | |
92 | ||
93 | static char *inferior_thisrun_terminal; | |
94 | ||
95 | /* Nonzero if our terminal settings are in effect. Zero if the | |
96 | inferior's settings are in effect. Ignored if !gdb_has_a_terminal | |
97 | (). */ | |
98 | ||
99 | int terminal_is_ours; | |
100 | ||
c5aa993b JM |
101 | enum |
102 | { | |
103 | yes, no, have_not_checked | |
104 | } | |
105 | gdb_has_a_terminal_flag = have_not_checked; | |
c906108c SS |
106 | |
107 | /* Does GDB have a terminal (on stdin)? */ | |
108 | int | |
fba45db2 | 109 | gdb_has_a_terminal (void) |
c906108c SS |
110 | { |
111 | switch (gdb_has_a_terminal_flag) | |
112 | { | |
113 | case yes: | |
114 | return 1; | |
115 | case no: | |
116 | return 0; | |
117 | case have_not_checked: | |
2cd58942 AC |
118 | /* Get all the current tty settings (including whether we have a |
119 | tty at all!). Can't do this in _initialize_inflow because | |
120 | serial_fdopen() won't work until the serial_ops_list is | |
121 | initialized. */ | |
c906108c SS |
122 | |
123 | #ifdef F_GETFL | |
124 | tflags_ours = fcntl (0, F_GETFL, 0); | |
125 | #endif | |
126 | ||
127 | gdb_has_a_terminal_flag = no; | |
2cd58942 | 128 | stdin_serial = serial_fdopen (0); |
c906108c SS |
129 | if (stdin_serial != NULL) |
130 | { | |
2cd58942 | 131 | our_ttystate = serial_get_tty_state (stdin_serial); |
c906108c SS |
132 | |
133 | if (our_ttystate != NULL) | |
134 | { | |
135 | gdb_has_a_terminal_flag = yes; | |
136 | #ifdef HAVE_TERMIOS | |
137 | our_process_group = tcgetpgrp (0); | |
138 | #endif | |
139 | #ifdef HAVE_TERMIO | |
140 | our_process_group = getpgrp (); | |
141 | #endif | |
142 | #ifdef HAVE_SGTTY | |
143 | ioctl (0, TIOCGPGRP, &our_process_group); | |
144 | #endif | |
145 | } | |
146 | } | |
147 | ||
148 | return gdb_has_a_terminal_flag == yes; | |
149 | default: | |
150 | /* "Can't happen". */ | |
151 | return 0; | |
152 | } | |
153 | } | |
154 | ||
155 | /* Macro for printing errors from ioctl operations */ | |
156 | ||
157 | #define OOPSY(what) \ | |
158 | if (result == -1) \ | |
159 | fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ | |
dc672865 | 160 | what, safe_strerror (errno)) |
c906108c | 161 | |
a14ed312 | 162 | static void terminal_ours_1 (int); |
c906108c SS |
163 | |
164 | /* Initialize the terminal settings we record for the inferior, | |
165 | before we actually run the inferior. */ | |
166 | ||
167 | void | |
fba45db2 | 168 | terminal_init_inferior_with_pgrp (int pgrp) |
c906108c SS |
169 | { |
170 | if (gdb_has_a_terminal ()) | |
171 | { | |
2cd58942 AC |
172 | /* We could just as well copy our_ttystate (if we felt like |
173 | adding a new function serial_copy_tty_state()). */ | |
c906108c | 174 | if (inferior_ttystate) |
b8c9b27d | 175 | xfree (inferior_ttystate); |
2cd58942 | 176 | inferior_ttystate = serial_get_tty_state (stdin_serial); |
c906108c SS |
177 | |
178 | #ifdef PROCESS_GROUP_TYPE | |
179 | inferior_process_group = pgrp; | |
180 | #endif | |
181 | ||
182 | /* Make sure that next time we call terminal_inferior (which will be | |
c5aa993b JM |
183 | before the program runs, as it needs to be), we install the new |
184 | process group. */ | |
c906108c SS |
185 | terminal_is_ours = 1; |
186 | } | |
187 | } | |
188 | ||
a790ad35 SC |
189 | /* Save the terminal settings again. This is necessary for the TUI |
190 | when it switches to TUI or non-TUI mode; curses changes the terminal | |
191 | and gdb must be able to restore it correctly. */ | |
192 | ||
193 | void | |
7bda5e4a | 194 | terminal_save_ours (void) |
a790ad35 SC |
195 | { |
196 | if (gdb_has_a_terminal ()) | |
197 | { | |
198 | /* We could just as well copy our_ttystate (if we felt like adding | |
199 | a new function serial_copy_tty_state). */ | |
200 | if (our_ttystate) | |
201 | xfree (our_ttystate); | |
202 | our_ttystate = serial_get_tty_state (stdin_serial); | |
203 | } | |
204 | } | |
205 | ||
c906108c | 206 | void |
fba45db2 | 207 | terminal_init_inferior (void) |
c906108c SS |
208 | { |
209 | #ifdef PROCESS_GROUP_TYPE | |
210 | /* This is for Lynx, and should be cleaned up by having Lynx be a separate | |
211 | debugging target with a version of target_terminal_init_inferior which | |
212 | passes in the process group to a generic routine which does all the work | |
213 | (and the non-threaded child_terminal_init_inferior can just pass in | |
39f77062 | 214 | inferior_ptid to the same routine). */ |
c906108c | 215 | /* We assume INFERIOR_PID is also the child's process group. */ |
39f77062 | 216 | terminal_init_inferior_with_pgrp (PIDGET (inferior_ptid)); |
c906108c SS |
217 | #endif /* PROCESS_GROUP_TYPE */ |
218 | } | |
219 | ||
220 | /* Put the inferior's terminal settings into effect. | |
221 | This is preparation for starting or resuming the inferior. */ | |
222 | ||
223 | void | |
fba45db2 | 224 | terminal_inferior (void) |
c906108c SS |
225 | { |
226 | if (gdb_has_a_terminal () && terminal_is_ours | |
2da6aac3 | 227 | && inferior_ttystate != NULL |
c906108c SS |
228 | && inferior_thisrun_terminal == 0) |
229 | { | |
230 | int result; | |
231 | ||
232 | #ifdef F_GETFL | |
233 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
234 | places we use F_SETFL, so I'm inclined to think perhaps there |
235 | is some reason, however perverse. Perhaps not though... */ | |
c906108c SS |
236 | result = fcntl (0, F_SETFL, tflags_inferior); |
237 | result = fcntl (0, F_SETFL, tflags_inferior); | |
238 | OOPSY ("fcntl F_SETFL"); | |
239 | #endif | |
240 | ||
241 | /* Because we were careful to not change in or out of raw mode in | |
c5aa993b JM |
242 | terminal_ours, we will not change in our out of raw mode with |
243 | this call, so we don't flush any input. */ | |
2cd58942 | 244 | result = serial_set_tty_state (stdin_serial, inferior_ttystate); |
c906108c SS |
245 | OOPSY ("setting tty state"); |
246 | ||
247 | if (!job_control) | |
248 | { | |
c5aa993b | 249 | sigint_ours = (void (*)()) signal (SIGINT, SIG_IGN); |
c906108c | 250 | #ifdef SIGQUIT |
c5aa993b | 251 | sigquit_ours = (void (*)()) signal (SIGQUIT, SIG_IGN); |
c906108c SS |
252 | #endif |
253 | } | |
254 | ||
255 | /* If attach_flag is set, we don't know whether we are sharing a | |
c5aa993b JM |
256 | terminal with the inferior or not. (attaching a process |
257 | without a terminal is one case where we do not; attaching a | |
258 | process which we ran from the same shell as GDB via `&' is | |
259 | one case where we do, I think (but perhaps this is not | |
260 | `sharing' in the sense that we need to save and restore tty | |
261 | state)). I don't know if there is any way to tell whether we | |
262 | are sharing a terminal. So what we do is to go through all | |
263 | the saving and restoring of the tty state, but ignore errors | |
264 | setting the process group, which will happen if we are not | |
265 | sharing a terminal). */ | |
c906108c SS |
266 | |
267 | if (job_control) | |
268 | { | |
269 | #ifdef HAVE_TERMIOS | |
270 | result = tcsetpgrp (0, inferior_process_group); | |
271 | if (!attach_flag) | |
272 | OOPSY ("tcsetpgrp"); | |
273 | #endif | |
274 | ||
275 | #ifdef HAVE_SGTTY | |
276 | result = ioctl (0, TIOCSPGRP, &inferior_process_group); | |
277 | if (!attach_flag) | |
278 | OOPSY ("TIOCSPGRP"); | |
279 | #endif | |
280 | } | |
281 | ||
282 | } | |
283 | terminal_is_ours = 0; | |
284 | } | |
285 | ||
286 | /* Put some of our terminal settings into effect, | |
287 | enough to get proper results from our output, | |
288 | but do not change into or out of RAW mode | |
289 | so that no input is discarded. | |
290 | ||
291 | After doing this, either terminal_ours or terminal_inferior | |
292 | should be called to get back to a normal state of affairs. */ | |
293 | ||
294 | void | |
fba45db2 | 295 | terminal_ours_for_output (void) |
c906108c SS |
296 | { |
297 | terminal_ours_1 (1); | |
298 | } | |
299 | ||
300 | /* Put our terminal settings into effect. | |
301 | First record the inferior's terminal settings | |
302 | so they can be restored properly later. */ | |
303 | ||
304 | void | |
fba45db2 | 305 | terminal_ours (void) |
c906108c SS |
306 | { |
307 | terminal_ours_1 (0); | |
308 | } | |
309 | ||
310 | /* output_only is not used, and should not be used unless we introduce | |
311 | separate terminal_is_ours and terminal_is_ours_for_output | |
312 | flags. */ | |
313 | ||
314 | static void | |
fba45db2 | 315 | terminal_ours_1 (int output_only) |
c906108c SS |
316 | { |
317 | /* Checking inferior_thisrun_terminal is necessary so that | |
318 | if GDB is running in the background, it won't block trying | |
319 | to do the ioctl()'s below. Checking gdb_has_a_terminal | |
320 | avoids attempting all the ioctl's when running in batch. */ | |
321 | if (inferior_thisrun_terminal != 0 || gdb_has_a_terminal () == 0) | |
322 | return; | |
323 | ||
324 | if (!terminal_is_ours) | |
325 | { | |
4b69c284 | 326 | #ifdef SIGTTOU |
c906108c | 327 | /* Ignore this signal since it will happen when we try to set the |
c5aa993b | 328 | pgrp. */ |
4b69c284 AC |
329 | void (*osigttou) () = NULL; |
330 | #endif | |
c906108c SS |
331 | int result; |
332 | ||
333 | terminal_is_ours = 1; | |
334 | ||
335 | #ifdef SIGTTOU | |
336 | if (job_control) | |
c5aa993b | 337 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
c906108c SS |
338 | #endif |
339 | ||
340 | if (inferior_ttystate) | |
b8c9b27d | 341 | xfree (inferior_ttystate); |
2cd58942 | 342 | inferior_ttystate = serial_get_tty_state (stdin_serial); |
c906108c SS |
343 | #ifdef HAVE_TERMIOS |
344 | inferior_process_group = tcgetpgrp (0); | |
345 | #endif | |
346 | #ifdef HAVE_TERMIO | |
347 | inferior_process_group = getpgrp (); | |
348 | #endif | |
349 | #ifdef HAVE_SGTTY | |
350 | ioctl (0, TIOCGPGRP, &inferior_process_group); | |
351 | #endif | |
352 | ||
353 | /* Here we used to set ICANON in our ttystate, but I believe this | |
c5aa993b JM |
354 | was an artifact from before when we used readline. Readline sets |
355 | the tty state when it needs to. | |
356 | FIXME-maybe: However, query() expects non-raw mode and doesn't | |
357 | use readline. Maybe query should use readline (on the other hand, | |
358 | this only matters for HAVE_SGTTY, not termio or termios, I think). */ | |
c906108c SS |
359 | |
360 | /* Set tty state to our_ttystate. We don't change in our out of raw | |
c5aa993b JM |
361 | mode, to avoid flushing input. We need to do the same thing |
362 | regardless of output_only, because we don't have separate | |
363 | terminal_is_ours and terminal_is_ours_for_output flags. It's OK, | |
364 | though, since readline will deal with raw mode when/if it needs to. | |
365 | */ | |
c906108c | 366 | |
2cd58942 | 367 | serial_noflush_set_tty_state (stdin_serial, our_ttystate, |
c906108c SS |
368 | inferior_ttystate); |
369 | ||
370 | if (job_control) | |
371 | { | |
372 | #ifdef HAVE_TERMIOS | |
373 | result = tcsetpgrp (0, our_process_group); | |
374 | #if 0 | |
375 | /* This fails on Ultrix with EINVAL if you run the testsuite | |
376 | in the background with nohup, and then log out. GDB never | |
377 | used to check for an error here, so perhaps there are other | |
378 | such situations as well. */ | |
379 | if (result == -1) | |
380 | fprintf_unfiltered (gdb_stderr, "[tcsetpgrp failed in terminal_ours: %s]\n", | |
dc672865 | 381 | safe_strerror (errno)); |
c906108c SS |
382 | #endif |
383 | #endif /* termios */ | |
384 | ||
385 | #ifdef HAVE_SGTTY | |
386 | result = ioctl (0, TIOCSPGRP, &our_process_group); | |
387 | #endif | |
388 | } | |
389 | ||
390 | #ifdef SIGTTOU | |
391 | if (job_control) | |
392 | signal (SIGTTOU, osigttou); | |
393 | #endif | |
394 | ||
395 | if (!job_control) | |
396 | { | |
397 | signal (SIGINT, sigint_ours); | |
398 | #ifdef SIGQUIT | |
399 | signal (SIGQUIT, sigquit_ours); | |
400 | #endif | |
401 | } | |
402 | ||
403 | #ifdef F_GETFL | |
404 | tflags_inferior = fcntl (0, F_GETFL, 0); | |
405 | ||
406 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
407 | places we use F_SETFL, so I'm inclined to think perhaps there |
408 | is some reason, however perverse. Perhaps not though... */ | |
c906108c SS |
409 | result = fcntl (0, F_SETFL, tflags_ours); |
410 | result = fcntl (0, F_SETFL, tflags_ours); | |
411 | #endif | |
412 | ||
c5aa993b | 413 | result = result; /* lint */ |
c906108c SS |
414 | } |
415 | } | |
416 | ||
c906108c | 417 | void |
fba45db2 | 418 | term_info (char *arg, int from_tty) |
c906108c SS |
419 | { |
420 | target_terminal_info (arg, from_tty); | |
421 | } | |
422 | ||
c906108c | 423 | void |
fba45db2 | 424 | child_terminal_info (char *args, int from_tty) |
c906108c SS |
425 | { |
426 | if (!gdb_has_a_terminal ()) | |
427 | { | |
428 | printf_filtered ("This GDB does not control a terminal.\n"); | |
429 | return; | |
430 | } | |
431 | ||
432 | printf_filtered ("Inferior's terminal status (currently saved by GDB):\n"); | |
433 | ||
434 | /* First the fcntl flags. */ | |
435 | { | |
436 | int flags; | |
c5aa993b | 437 | |
c906108c SS |
438 | flags = tflags_inferior; |
439 | ||
440 | printf_filtered ("File descriptor flags = "); | |
441 | ||
442 | #ifndef O_ACCMODE | |
443 | #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) | |
444 | #endif | |
445 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug */ | |
446 | switch (flags & (O_ACCMODE)) | |
447 | { | |
c5aa993b JM |
448 | case O_RDONLY: |
449 | printf_filtered ("O_RDONLY"); | |
450 | break; | |
451 | case O_WRONLY: | |
452 | printf_filtered ("O_WRONLY"); | |
453 | break; | |
454 | case O_RDWR: | |
455 | printf_filtered ("O_RDWR"); | |
456 | break; | |
c906108c SS |
457 | } |
458 | flags &= ~(O_ACCMODE); | |
459 | ||
460 | #ifdef O_NONBLOCK | |
c5aa993b | 461 | if (flags & O_NONBLOCK) |
c906108c SS |
462 | printf_filtered (" | O_NONBLOCK"); |
463 | flags &= ~O_NONBLOCK; | |
464 | #endif | |
c5aa993b | 465 | |
c906108c SS |
466 | #if defined (O_NDELAY) |
467 | /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will | |
468 | print it as O_NONBLOCK, which is good cause that is what POSIX | |
469 | has, and the flag will already be cleared by the time we get here. */ | |
470 | if (flags & O_NDELAY) | |
471 | printf_filtered (" | O_NDELAY"); | |
472 | flags &= ~O_NDELAY; | |
473 | #endif | |
474 | ||
475 | if (flags & O_APPEND) | |
476 | printf_filtered (" | O_APPEND"); | |
477 | flags &= ~O_APPEND; | |
478 | ||
479 | #if defined (O_BINARY) | |
480 | if (flags & O_BINARY) | |
481 | printf_filtered (" | O_BINARY"); | |
482 | flags &= ~O_BINARY; | |
483 | #endif | |
484 | ||
485 | if (flags) | |
486 | printf_filtered (" | 0x%x", flags); | |
487 | printf_filtered ("\n"); | |
488 | } | |
489 | ||
490 | #ifdef PROCESS_GROUP_TYPE | |
2acceee2 JM |
491 | printf_filtered ("Process group = %d\n", |
492 | (int) inferior_process_group); | |
c906108c SS |
493 | #endif |
494 | ||
2cd58942 | 495 | serial_print_tty_state (stdin_serial, inferior_ttystate, gdb_stdout); |
c906108c SS |
496 | } |
497 | \f | |
498 | /* NEW_TTY_PREFORK is called before forking a new child process, | |
499 | so we can record the state of ttys in the child to be formed. | |
500 | TTYNAME is null if we are to share the terminal with gdb; | |
501 | or points to a string containing the name of the desired tty. | |
502 | ||
503 | NEW_TTY is called in new child processes under Unix, which will | |
504 | become debugger target processes. This actually switches to | |
505 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
506 | ||
507 | void | |
fba45db2 | 508 | new_tty_prefork (char *ttyname) |
c906108c SS |
509 | { |
510 | /* Save the name for later, for determining whether we and the child | |
511 | are sharing a tty. */ | |
512 | inferior_thisrun_terminal = ttyname; | |
513 | } | |
514 | ||
515 | void | |
fba45db2 | 516 | new_tty (void) |
c906108c | 517 | { |
52f0bd74 | 518 | int tty; |
c906108c SS |
519 | |
520 | if (inferior_thisrun_terminal == 0) | |
521 | return; | |
522 | #if !defined(__GO32__) && !defined(_WIN32) | |
523 | #ifdef TIOCNOTTY | |
524 | /* Disconnect the child process from our controlling terminal. On some | |
525 | systems (SVR4 for example), this may cause a SIGTTOU, so temporarily | |
526 | ignore SIGTTOU. */ | |
c5aa993b | 527 | tty = open ("/dev/tty", O_RDWR); |
c906108c SS |
528 | if (tty > 0) |
529 | { | |
530 | void (*osigttou) (); | |
531 | ||
c5aa993b JM |
532 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
533 | ioctl (tty, TIOCNOTTY, 0); | |
534 | close (tty); | |
535 | signal (SIGTTOU, osigttou); | |
c906108c SS |
536 | } |
537 | #endif | |
538 | ||
539 | /* Now open the specified new terminal. */ | |
540 | ||
541 | #ifdef USE_O_NOCTTY | |
c5aa993b | 542 | tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
c906108c | 543 | #else |
c5aa993b | 544 | tty = open (inferior_thisrun_terminal, O_RDWR); |
c906108c SS |
545 | #endif |
546 | if (tty == -1) | |
547 | { | |
548 | print_sys_errmsg (inferior_thisrun_terminal, errno); | |
c5aa993b | 549 | _exit (1); |
c906108c SS |
550 | } |
551 | ||
552 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
553 | if (tty != 0) | |
c5aa993b JM |
554 | { |
555 | close (0); | |
556 | dup (tty); | |
557 | } | |
c906108c | 558 | if (tty != 1) |
c5aa993b JM |
559 | { |
560 | close (1); | |
561 | dup (tty); | |
562 | } | |
c906108c | 563 | if (tty != 2) |
c5aa993b JM |
564 | { |
565 | close (2); | |
566 | dup (tty); | |
567 | } | |
c906108c | 568 | if (tty > 2) |
c5aa993b JM |
569 | close (tty); |
570 | #endif /* !go32 && !win32 */ | |
c906108c SS |
571 | } |
572 | \f | |
573 | /* Kill the inferior process. Make us have no inferior. */ | |
574 | ||
c906108c | 575 | static void |
fba45db2 | 576 | kill_command (char *arg, int from_tty) |
c906108c | 577 | { |
39f77062 | 578 | /* FIXME: This should not really be inferior_ptid (or target_has_execution). |
c906108c SS |
579 | It should be a distinct flag that indicates that a target is active, cuz |
580 | some targets don't have processes! */ | |
581 | ||
39f77062 | 582 | if (ptid_equal (inferior_ptid, null_ptid)) |
c906108c SS |
583 | error ("The program is not being run."); |
584 | if (!query ("Kill the program being debugged? ")) | |
585 | error ("Not confirmed."); | |
586 | target_kill (); | |
587 | ||
c5aa993b | 588 | init_thread_list (); /* Destroy thread info */ |
c906108c SS |
589 | |
590 | /* Killing off the inferior can leave us with a core file. If so, | |
591 | print the state we are left in. */ | |
c5aa993b JM |
592 | if (target_has_stack) |
593 | { | |
594 | printf_filtered ("In %s,\n", target_longname); | |
6e7f8b9c | 595 | if (deprecated_selected_frame == NULL) |
c5aa993b JM |
596 | fputs_filtered ("No selected stack frame.\n", gdb_stdout); |
597 | else | |
6e7f8b9c AC |
598 | print_stack_frame (deprecated_selected_frame, |
599 | frame_relative_level (deprecated_selected_frame), 1); | |
c5aa993b | 600 | } |
c906108c SS |
601 | } |
602 | \f | |
603 | /* Call set_sigint_trap when you need to pass a signal on to an attached | |
604 | process when handling SIGINT */ | |
605 | ||
c906108c | 606 | static void |
fba45db2 | 607 | pass_signal (int signo) |
c906108c SS |
608 | { |
609 | #ifndef _WIN32 | |
39f77062 | 610 | kill (PIDGET (inferior_ptid), SIGINT); |
c906108c SS |
611 | #endif |
612 | } | |
613 | ||
c5aa993b | 614 | static void (*osig) (); |
c906108c SS |
615 | |
616 | void | |
fba45db2 | 617 | set_sigint_trap (void) |
c906108c SS |
618 | { |
619 | if (attach_flag || inferior_thisrun_terminal) | |
620 | { | |
c5aa993b | 621 | osig = (void (*)()) signal (SIGINT, pass_signal); |
c906108c SS |
622 | } |
623 | } | |
624 | ||
625 | void | |
fba45db2 | 626 | clear_sigint_trap (void) |
c906108c SS |
627 | { |
628 | if (attach_flag || inferior_thisrun_terminal) | |
629 | { | |
630 | signal (SIGINT, osig); | |
631 | } | |
632 | } | |
633 | \f | |
634 | #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) | |
635 | static void (*old_sigio) (); | |
636 | ||
637 | static void | |
fba45db2 | 638 | handle_sigio (int signo) |
c906108c SS |
639 | { |
640 | int numfds; | |
641 | fd_set readfds; | |
642 | ||
643 | signal (SIGIO, handle_sigio); | |
644 | ||
645 | FD_ZERO (&readfds); | |
646 | FD_SET (target_activity_fd, &readfds); | |
647 | numfds = select (target_activity_fd + 1, &readfds, NULL, NULL, NULL); | |
648 | if (numfds >= 0 && FD_ISSET (target_activity_fd, &readfds)) | |
649 | { | |
650 | #ifndef _WIN32 | |
651 | if ((*target_activity_function) ()) | |
39f77062 | 652 | kill (PIDGET (inferior_ptid), SIGINT); |
c906108c SS |
653 | #endif |
654 | } | |
655 | } | |
656 | ||
657 | static int old_fcntl_flags; | |
658 | ||
659 | void | |
fba45db2 | 660 | set_sigio_trap (void) |
c906108c SS |
661 | { |
662 | if (target_activity_function) | |
663 | { | |
c5aa993b JM |
664 | old_sigio = (void (*)()) signal (SIGIO, handle_sigio); |
665 | fcntl (target_activity_fd, F_SETOWN, getpid ()); | |
c906108c SS |
666 | old_fcntl_flags = fcntl (target_activity_fd, F_GETFL, 0); |
667 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags | FASYNC); | |
668 | } | |
669 | } | |
670 | ||
671 | void | |
fba45db2 | 672 | clear_sigio_trap (void) |
c906108c SS |
673 | { |
674 | if (target_activity_function) | |
675 | { | |
676 | signal (SIGIO, old_sigio); | |
677 | fcntl (target_activity_fd, F_SETFL, old_fcntl_flags); | |
678 | } | |
679 | } | |
680 | #else /* No SIGIO. */ | |
681 | void | |
fba45db2 | 682 | set_sigio_trap (void) |
c906108c SS |
683 | { |
684 | if (target_activity_function) | |
e1e9e218 | 685 | internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
c906108c SS |
686 | } |
687 | ||
688 | void | |
fba45db2 | 689 | clear_sigio_trap (void) |
c906108c SS |
690 | { |
691 | if (target_activity_function) | |
e1e9e218 | 692 | internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
c906108c SS |
693 | } |
694 | #endif /* No SIGIO. */ | |
695 | \f | |
696 | ||
697 | /* This is here because this is where we figure out whether we (probably) | |
698 | have job control. Just using job_control only does part of it because | |
699 | setpgid or setpgrp might not exist on a system without job control. | |
700 | It might be considered misplaced (on the other hand, process groups and | |
701 | job control are closely related to ttys). | |
702 | ||
703 | For a more clean implementation, in libiberty, put a setpgid which merely | |
704 | calls setpgrp and a setpgrp which does nothing (any system with job control | |
705 | will have one or the other). */ | |
706 | int | |
fba45db2 | 707 | gdb_setpgid (void) |
c906108c SS |
708 | { |
709 | int retval = 0; | |
710 | ||
711 | if (job_control) | |
712 | { | |
0200359f MK |
713 | #if defined (HAVE_TERMIOS) || defined (TIOCGPGRP) |
714 | #ifdef HAVE_SETPGID | |
715 | /* The call setpgid (0, 0) is supposed to work and mean the same | |
716 | thing as this, but on Ultrix 4.2A it fails with EPERM (and | |
c5aa993b | 717 | setpgid (getpid (), getpid ()) succeeds). */ |
c906108c SS |
718 | retval = setpgid (getpid (), getpid ()); |
719 | #else | |
0200359f MK |
720 | #ifdef HAVE_SETPGRP |
721 | #ifdef SETPGRP_VOID | |
c906108c SS |
722 | retval = setpgrp (); |
723 | #else | |
724 | retval = setpgrp (getpid (), getpid ()); | |
0200359f MK |
725 | #endif |
726 | #endif /* HAVE_SETPGRP */ | |
727 | #endif /* HAVE_SETPGID */ | |
728 | #endif /* defined (HAVE_TERMIOS) || defined (TIOCGPGRP) */ | |
c906108c | 729 | } |
0200359f | 730 | |
c906108c SS |
731 | return retval; |
732 | } | |
733 | ||
734 | void | |
fba45db2 | 735 | _initialize_inflow (void) |
c906108c SS |
736 | { |
737 | add_info ("terminal", term_info, | |
c5aa993b | 738 | "Print inferior's saved terminal status."); |
c906108c SS |
739 | |
740 | add_com ("kill", class_run, kill_command, | |
741 | "Kill execution of program being debugged."); | |
742 | ||
39f77062 | 743 | inferior_ptid = null_ptid; |
c906108c SS |
744 | |
745 | terminal_is_ours = 1; | |
746 | ||
747 | /* OK, figure out whether we have job control. If neither termios nor | |
748 | sgtty (i.e. termio or go32), leave job_control 0. */ | |
749 | ||
750 | #if defined (HAVE_TERMIOS) | |
751 | /* Do all systems with termios have the POSIX way of identifying job | |
752 | control? I hope so. */ | |
753 | #ifdef _POSIX_JOB_CONTROL | |
754 | job_control = 1; | |
755 | #else | |
756 | #ifdef _SC_JOB_CONTROL | |
757 | job_control = sysconf (_SC_JOB_CONTROL); | |
758 | #else | |
c5aa993b JM |
759 | job_control = 0; /* have to assume the worst */ |
760 | #endif /* _SC_JOB_CONTROL */ | |
761 | #endif /* _POSIX_JOB_CONTROL */ | |
762 | #endif /* HAVE_TERMIOS */ | |
c906108c SS |
763 | |
764 | #ifdef HAVE_SGTTY | |
765 | #ifdef TIOCGPGRP | |
766 | job_control = 1; | |
767 | #else | |
768 | job_control = 0; | |
769 | #endif /* TIOCGPGRP */ | |
770 | #endif /* sgtty */ | |
771 | } |