Commit | Line | Data |
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c906108c | 1 | /* Low level interface to ptrace, for GDB when running under Unix. |
197e01b6 | 2 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
0fb0cc75 JB |
3 | 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, |
4 | 2009 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 | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 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 | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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" | |
7e1789f5 | 29 | #include "observer.h" |
c906108c SS |
30 | |
31 | #include "gdb_string.h" | |
32 | #include <signal.h> | |
33 | #include <fcntl.h> | |
0ea3f30e | 34 | #include "gdb_select.h" |
c906108c | 35 | |
44270758 | 36 | #include "inflow.h" |
c906108c | 37 | |
c2d11a7d JM |
38 | #ifdef HAVE_SYS_IOCTL_H |
39 | #include <sys/ioctl.h> | |
40 | #endif | |
41 | ||
f2acbe1c MK |
42 | #ifndef O_NOCTTY |
43 | #define O_NOCTTY 0 | |
44 | #endif | |
45 | ||
c906108c | 46 | #if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN) |
a14ed312 | 47 | static void handle_sigio (int); |
c906108c SS |
48 | #endif |
49 | ||
a14ed312 | 50 | extern void _initialize_inflow (void); |
392a587b | 51 | |
a14ed312 | 52 | static void pass_signal (int); |
c906108c | 53 | |
a14ed312 | 54 | static void kill_command (char *, int); |
c906108c | 55 | |
a14ed312 | 56 | static void terminal_ours_1 (int); |
c906108c SS |
57 | \f |
58 | /* Record terminal status separately for debugger and inferior. */ | |
59 | ||
819cc324 | 60 | static struct serial *stdin_serial; |
c906108c | 61 | |
7e1789f5 PA |
62 | /* Terminal related info we need to keep track of. Each inferior |
63 | holds an instance of this structure --- we save it whenever the | |
64 | corresponding inferior stops, and restore it to the foreground | |
65 | inferior when it resumes. */ | |
66 | struct terminal_info | |
67 | { | |
68 | /* The name of the tty (from the `tty' command) that we gave to the | |
69 | inferior when it was started. */ | |
70 | const char *run_terminal; | |
71 | ||
72 | /* TTY state. We save it whenever the inferior stops, and restore | |
73 | it when it resumes. */ | |
74 | serial_ttystate ttystate; | |
75 | ||
76 | #ifdef PROCESS_GROUP_TYPE | |
77 | /* Process group. Saved and restored just like ttystate. */ | |
78 | PROCESS_GROUP_TYPE process_group; | |
79 | #endif | |
c906108c | 80 | |
7e1789f5 PA |
81 | /* fcntl flags. Saved and restored just like ttystate. */ |
82 | int tflags; | |
83 | }; | |
c906108c | 84 | |
7e1789f5 PA |
85 | /* Our own tty state, which we restore every time we need to deal with |
86 | the terminal. This is only set once, when GDB first starts. The | |
87 | settings of flags which readline saves and restores and | |
88 | unimportant. */ | |
89 | static struct terminal_info our_terminal_info; | |
c906108c SS |
90 | |
91 | #ifdef PROCESS_GROUP_TYPE | |
7e1789f5 PA |
92 | |
93 | /* Return the process group of the current inferior. */ | |
94 | ||
95 | PROCESS_GROUP_TYPE | |
96 | inferior_process_group (void) | |
97 | { | |
98 | return current_inferior ()->terminal_info->process_group; | |
99 | } | |
c906108c SS |
100 | #endif |
101 | ||
102 | /* While the inferior is running, we want SIGINT and SIGQUIT to go to the | |
103 | inferior only. If we have job control, that takes care of it. If not, | |
104 | we save our handlers in these two variables and set SIGINT and SIGQUIT | |
105 | to SIG_IGN. */ | |
106 | ||
107 | static void (*sigint_ours) (); | |
108 | static void (*sigquit_ours) (); | |
109 | ||
7e1789f5 PA |
110 | /* The name of the tty (from the `tty' command) that we're giving to |
111 | the inferior when starting it up. This is only (and should only | |
112 | be) used as a transient global by new_tty_prefork, new_tty and | |
113 | create_tty_session, called from fork_inferior, while forking a new | |
114 | child. */ | |
3cb3b8df | 115 | static const char *inferior_thisrun_terminal; |
c906108c SS |
116 | |
117 | /* Nonzero if our terminal settings are in effect. Zero if the | |
118 | inferior's settings are in effect. Ignored if !gdb_has_a_terminal | |
119 | (). */ | |
120 | ||
121 | int terminal_is_ours; | |
122 | ||
64a0ac84 PA |
123 | #ifdef PROCESS_GROUP_TYPE |
124 | static PROCESS_GROUP_TYPE | |
125 | gdb_getpgrp (void) | |
126 | { | |
127 | int process_group = -1; | |
128 | #ifdef HAVE_TERMIOS | |
129 | process_group = tcgetpgrp (0); | |
130 | #endif | |
131 | #ifdef HAVE_TERMIO | |
132 | process_group = getpgrp (); | |
133 | #endif | |
134 | #ifdef HAVE_SGTTY | |
135 | ioctl (0, TIOCGPGRP, &process_group); | |
136 | #endif | |
137 | return process_group; | |
138 | } | |
139 | #endif | |
140 | ||
c5aa993b JM |
141 | enum |
142 | { | |
143 | yes, no, have_not_checked | |
144 | } | |
145 | gdb_has_a_terminal_flag = have_not_checked; | |
c906108c SS |
146 | |
147 | /* Does GDB have a terminal (on stdin)? */ | |
148 | int | |
fba45db2 | 149 | gdb_has_a_terminal (void) |
c906108c SS |
150 | { |
151 | switch (gdb_has_a_terminal_flag) | |
152 | { | |
153 | case yes: | |
154 | return 1; | |
155 | case no: | |
156 | return 0; | |
157 | case have_not_checked: | |
2cd58942 AC |
158 | /* Get all the current tty settings (including whether we have a |
159 | tty at all!). Can't do this in _initialize_inflow because | |
160 | serial_fdopen() won't work until the serial_ops_list is | |
161 | initialized. */ | |
c906108c SS |
162 | |
163 | #ifdef F_GETFL | |
7e1789f5 | 164 | our_terminal_info.tflags = fcntl (0, F_GETFL, 0); |
c906108c SS |
165 | #endif |
166 | ||
167 | gdb_has_a_terminal_flag = no; | |
c906108c SS |
168 | if (stdin_serial != NULL) |
169 | { | |
7e1789f5 | 170 | our_terminal_info.ttystate = serial_get_tty_state (stdin_serial); |
c906108c | 171 | |
7e1789f5 | 172 | if (our_terminal_info.ttystate != NULL) |
c906108c SS |
173 | { |
174 | gdb_has_a_terminal_flag = yes; | |
807bddf3 | 175 | #ifdef PROCESS_GROUP_TYPE |
7e1789f5 | 176 | our_terminal_info.process_group = gdb_getpgrp (); |
807bddf3 | 177 | #endif |
c906108c SS |
178 | } |
179 | } | |
180 | ||
181 | return gdb_has_a_terminal_flag == yes; | |
182 | default: | |
183 | /* "Can't happen". */ | |
184 | return 0; | |
185 | } | |
186 | } | |
187 | ||
188 | /* Macro for printing errors from ioctl operations */ | |
189 | ||
190 | #define OOPSY(what) \ | |
191 | if (result == -1) \ | |
192 | fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ | |
dc672865 | 193 | what, safe_strerror (errno)) |
c906108c | 194 | |
a14ed312 | 195 | static void terminal_ours_1 (int); |
c906108c SS |
196 | |
197 | /* Initialize the terminal settings we record for the inferior, | |
198 | before we actually run the inferior. */ | |
199 | ||
200 | void | |
fba45db2 | 201 | terminal_init_inferior_with_pgrp (int pgrp) |
c906108c SS |
202 | { |
203 | if (gdb_has_a_terminal ()) | |
204 | { | |
7e1789f5 PA |
205 | struct inferior *inf = current_inferior (); |
206 | ||
2cd58942 AC |
207 | /* We could just as well copy our_ttystate (if we felt like |
208 | adding a new function serial_copy_tty_state()). */ | |
7e1789f5 PA |
209 | xfree (inf->terminal_info->ttystate); |
210 | inf->terminal_info->ttystate | |
211 | = serial_get_tty_state (stdin_serial); | |
c906108c SS |
212 | |
213 | #ifdef PROCESS_GROUP_TYPE | |
7e1789f5 | 214 | inf->terminal_info->process_group = pgrp; |
c906108c SS |
215 | #endif |
216 | ||
217 | /* Make sure that next time we call terminal_inferior (which will be | |
c5aa993b JM |
218 | before the program runs, as it needs to be), we install the new |
219 | process group. */ | |
c906108c SS |
220 | terminal_is_ours = 1; |
221 | } | |
222 | } | |
223 | ||
a790ad35 SC |
224 | /* Save the terminal settings again. This is necessary for the TUI |
225 | when it switches to TUI or non-TUI mode; curses changes the terminal | |
226 | and gdb must be able to restore it correctly. */ | |
227 | ||
228 | void | |
7bda5e4a | 229 | terminal_save_ours (void) |
a790ad35 SC |
230 | { |
231 | if (gdb_has_a_terminal ()) | |
232 | { | |
233 | /* We could just as well copy our_ttystate (if we felt like adding | |
234 | a new function serial_copy_tty_state). */ | |
7e1789f5 PA |
235 | xfree (our_terminal_info.ttystate); |
236 | our_terminal_info.ttystate = serial_get_tty_state (stdin_serial); | |
a790ad35 SC |
237 | } |
238 | } | |
239 | ||
c906108c | 240 | void |
fba45db2 | 241 | terminal_init_inferior (void) |
c906108c SS |
242 | { |
243 | #ifdef PROCESS_GROUP_TYPE | |
244 | /* This is for Lynx, and should be cleaned up by having Lynx be a separate | |
245 | debugging target with a version of target_terminal_init_inferior which | |
246 | passes in the process group to a generic routine which does all the work | |
247 | (and the non-threaded child_terminal_init_inferior can just pass in | |
39f77062 | 248 | inferior_ptid to the same routine). */ |
c906108c | 249 | /* We assume INFERIOR_PID is also the child's process group. */ |
39f77062 | 250 | terminal_init_inferior_with_pgrp (PIDGET (inferior_ptid)); |
c906108c SS |
251 | #endif /* PROCESS_GROUP_TYPE */ |
252 | } | |
253 | ||
254 | /* Put the inferior's terminal settings into effect. | |
255 | This is preparation for starting or resuming the inferior. */ | |
256 | ||
257 | void | |
fba45db2 | 258 | terminal_inferior (void) |
c906108c | 259 | { |
7e1789f5 PA |
260 | struct inferior *inf; |
261 | ||
262 | if (!terminal_is_ours) | |
263 | return; | |
264 | ||
265 | inf = current_inferior (); | |
266 | ||
267 | if (gdb_has_a_terminal () | |
268 | && inf->terminal_info->ttystate != NULL | |
269 | && inf->terminal_info->run_terminal == NULL) | |
c906108c SS |
270 | { |
271 | int result; | |
272 | ||
273 | #ifdef F_GETFL | |
274 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
275 | places we use F_SETFL, so I'm inclined to think perhaps there |
276 | is some reason, however perverse. Perhaps not though... */ | |
7e1789f5 PA |
277 | result = fcntl (0, F_SETFL, inf->terminal_info->tflags); |
278 | result = fcntl (0, F_SETFL, inf->terminal_info->tflags); | |
c906108c SS |
279 | OOPSY ("fcntl F_SETFL"); |
280 | #endif | |
281 | ||
282 | /* Because we were careful to not change in or out of raw mode in | |
c5aa993b JM |
283 | terminal_ours, we will not change in our out of raw mode with |
284 | this call, so we don't flush any input. */ | |
7e1789f5 PA |
285 | result = serial_set_tty_state (stdin_serial, |
286 | inf->terminal_info->ttystate); | |
c906108c SS |
287 | OOPSY ("setting tty state"); |
288 | ||
289 | if (!job_control) | |
290 | { | |
c5aa993b | 291 | sigint_ours = (void (*)()) signal (SIGINT, SIG_IGN); |
c906108c | 292 | #ifdef SIGQUIT |
c5aa993b | 293 | sigquit_ours = (void (*)()) signal (SIGQUIT, SIG_IGN); |
c906108c SS |
294 | #endif |
295 | } | |
296 | ||
297 | /* If attach_flag is set, we don't know whether we are sharing a | |
c5aa993b JM |
298 | terminal with the inferior or not. (attaching a process |
299 | without a terminal is one case where we do not; attaching a | |
300 | process which we ran from the same shell as GDB via `&' is | |
301 | one case where we do, I think (but perhaps this is not | |
302 | `sharing' in the sense that we need to save and restore tty | |
303 | state)). I don't know if there is any way to tell whether we | |
304 | are sharing a terminal. So what we do is to go through all | |
305 | the saving and restoring of the tty state, but ignore errors | |
306 | setting the process group, which will happen if we are not | |
307 | sharing a terminal). */ | |
c906108c SS |
308 | |
309 | if (job_control) | |
310 | { | |
311 | #ifdef HAVE_TERMIOS | |
7e1789f5 | 312 | result = tcsetpgrp (0, inf->terminal_info->process_group); |
181e7f93 | 313 | if (!inf->attach_flag) |
c906108c SS |
314 | OOPSY ("tcsetpgrp"); |
315 | #endif | |
316 | ||
317 | #ifdef HAVE_SGTTY | |
7e1789f5 | 318 | result = ioctl (0, TIOCSPGRP, &inf->terminal_info->process_group); |
181e7f93 | 319 | if (!inf->attach_flag) |
c906108c SS |
320 | OOPSY ("TIOCSPGRP"); |
321 | #endif | |
322 | } | |
323 | ||
324 | } | |
325 | terminal_is_ours = 0; | |
326 | } | |
327 | ||
328 | /* Put some of our terminal settings into effect, | |
329 | enough to get proper results from our output, | |
330 | but do not change into or out of RAW mode | |
331 | so that no input is discarded. | |
332 | ||
333 | After doing this, either terminal_ours or terminal_inferior | |
334 | should be called to get back to a normal state of affairs. */ | |
335 | ||
336 | void | |
fba45db2 | 337 | terminal_ours_for_output (void) |
c906108c SS |
338 | { |
339 | terminal_ours_1 (1); | |
340 | } | |
341 | ||
342 | /* Put our terminal settings into effect. | |
343 | First record the inferior's terminal settings | |
344 | so they can be restored properly later. */ | |
345 | ||
346 | void | |
fba45db2 | 347 | terminal_ours (void) |
c906108c SS |
348 | { |
349 | terminal_ours_1 (0); | |
350 | } | |
351 | ||
352 | /* output_only is not used, and should not be used unless we introduce | |
353 | separate terminal_is_ours and terminal_is_ours_for_output | |
354 | flags. */ | |
355 | ||
356 | static void | |
fba45db2 | 357 | terminal_ours_1 (int output_only) |
c906108c | 358 | { |
7e1789f5 PA |
359 | struct inferior *inf; |
360 | ||
361 | if (terminal_is_ours) | |
362 | return; | |
363 | ||
364 | /* Checking inferior->run_terminal is necessary so that | |
c906108c SS |
365 | if GDB is running in the background, it won't block trying |
366 | to do the ioctl()'s below. Checking gdb_has_a_terminal | |
367 | avoids attempting all the ioctl's when running in batch. */ | |
7e1789f5 PA |
368 | |
369 | inf = current_inferior (); | |
370 | ||
371 | if (inf->terminal_info->run_terminal != NULL || gdb_has_a_terminal () == 0) | |
c906108c SS |
372 | return; |
373 | ||
374 | if (!terminal_is_ours) | |
375 | { | |
4b69c284 | 376 | #ifdef SIGTTOU |
c906108c | 377 | /* Ignore this signal since it will happen when we try to set the |
c5aa993b | 378 | pgrp. */ |
4b69c284 AC |
379 | void (*osigttou) () = NULL; |
380 | #endif | |
c906108c SS |
381 | int result; |
382 | ||
383 | terminal_is_ours = 1; | |
384 | ||
385 | #ifdef SIGTTOU | |
386 | if (job_control) | |
c5aa993b | 387 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
c906108c SS |
388 | #endif |
389 | ||
7e1789f5 PA |
390 | xfree (inf->terminal_info->ttystate); |
391 | inf->terminal_info->ttystate = serial_get_tty_state (stdin_serial); | |
64a0ac84 | 392 | |
49a834f9 | 393 | #ifdef PROCESS_GROUP_TYPE |
181e7f93 | 394 | if (!inf->attach_flag) |
64a0ac84 PA |
395 | /* If setpgrp failed in terminal_inferior, this would give us |
396 | our process group instead of the inferior's. See | |
397 | terminal_inferior for details. */ | |
7e1789f5 | 398 | inf->terminal_info->process_group = gdb_getpgrp (); |
49a834f9 | 399 | #endif |
c906108c SS |
400 | |
401 | /* Here we used to set ICANON in our ttystate, but I believe this | |
c5aa993b JM |
402 | was an artifact from before when we used readline. Readline sets |
403 | the tty state when it needs to. | |
404 | FIXME-maybe: However, query() expects non-raw mode and doesn't | |
405 | use readline. Maybe query should use readline (on the other hand, | |
406 | this only matters for HAVE_SGTTY, not termio or termios, I think). */ | |
c906108c SS |
407 | |
408 | /* Set tty state to our_ttystate. We don't change in our out of raw | |
c5aa993b JM |
409 | mode, to avoid flushing input. We need to do the same thing |
410 | regardless of output_only, because we don't have separate | |
411 | terminal_is_ours and terminal_is_ours_for_output flags. It's OK, | |
412 | though, since readline will deal with raw mode when/if it needs to. | |
413 | */ | |
c906108c | 414 | |
7e1789f5 PA |
415 | serial_noflush_set_tty_state (stdin_serial, our_terminal_info.ttystate, |
416 | inf->terminal_info->ttystate); | |
c906108c SS |
417 | |
418 | if (job_control) | |
419 | { | |
420 | #ifdef HAVE_TERMIOS | |
7e1789f5 | 421 | result = tcsetpgrp (0, our_terminal_info.process_group); |
c906108c SS |
422 | #if 0 |
423 | /* This fails on Ultrix with EINVAL if you run the testsuite | |
424 | in the background with nohup, and then log out. GDB never | |
425 | used to check for an error here, so perhaps there are other | |
426 | such situations as well. */ | |
427 | if (result == -1) | |
428 | fprintf_unfiltered (gdb_stderr, "[tcsetpgrp failed in terminal_ours: %s]\n", | |
dc672865 | 429 | safe_strerror (errno)); |
c906108c SS |
430 | #endif |
431 | #endif /* termios */ | |
432 | ||
433 | #ifdef HAVE_SGTTY | |
7e1789f5 | 434 | result = ioctl (0, TIOCSPGRP, &our_terminal_info.process_group); |
c906108c SS |
435 | #endif |
436 | } | |
437 | ||
438 | #ifdef SIGTTOU | |
439 | if (job_control) | |
440 | signal (SIGTTOU, osigttou); | |
441 | #endif | |
442 | ||
443 | if (!job_control) | |
444 | { | |
445 | signal (SIGINT, sigint_ours); | |
446 | #ifdef SIGQUIT | |
447 | signal (SIGQUIT, sigquit_ours); | |
448 | #endif | |
449 | } | |
450 | ||
451 | #ifdef F_GETFL | |
7e1789f5 | 452 | inf->terminal_info->tflags = fcntl (0, F_GETFL, 0); |
c906108c SS |
453 | |
454 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
455 | places we use F_SETFL, so I'm inclined to think perhaps there |
456 | is some reason, however perverse. Perhaps not though... */ | |
7e1789f5 PA |
457 | result = fcntl (0, F_SETFL, our_terminal_info.tflags); |
458 | result = fcntl (0, F_SETFL, our_terminal_info.tflags); | |
c906108c | 459 | #endif |
c906108c SS |
460 | } |
461 | } | |
462 | ||
7e1789f5 PA |
463 | /* This is a "new_inferior" observer. It's business is to allocate |
464 | the TERMINAL_INFO member of the inferior structure. This field is | |
465 | private to inflow.c, and its type is opaque to the rest of GDB. | |
466 | PID is the target pid of the inferior that has just been added to | |
467 | the inferior list. */ | |
468 | ||
469 | static void | |
470 | inflow_new_inferior (int pid) | |
471 | { | |
472 | struct inferior *inf = find_inferior_pid (pid); | |
473 | ||
474 | inf->terminal_info = XZALLOC (struct terminal_info); | |
475 | } | |
476 | ||
477 | /* This is a "inferior_exit" observer. Releases the TERMINAL_INFO member | |
478 | of the inferior structure. This field is private to inflow.c, and | |
479 | its type is opaque to the rest of GDB. PID is the target pid of | |
480 | the inferior that is about to be removed from the inferior | |
481 | list. */ | |
482 | ||
483 | static void | |
484 | inflow_inferior_exit (int pid) | |
485 | { | |
486 | struct inferior *inf = find_inferior_pid (pid); | |
487 | ||
488 | xfree (inf->terminal_info); | |
489 | inf->terminal_info = NULL; | |
490 | } | |
491 | ||
c906108c | 492 | void |
fba45db2 | 493 | term_info (char *arg, int from_tty) |
c906108c SS |
494 | { |
495 | target_terminal_info (arg, from_tty); | |
496 | } | |
497 | ||
c906108c | 498 | void |
fba45db2 | 499 | child_terminal_info (char *args, int from_tty) |
c906108c | 500 | { |
7e1789f5 PA |
501 | struct inferior *inf; |
502 | ||
c906108c SS |
503 | if (!gdb_has_a_terminal ()) |
504 | { | |
a3f17187 | 505 | printf_filtered (_("This GDB does not control a terminal.\n")); |
c906108c SS |
506 | return; |
507 | } | |
508 | ||
7e1789f5 PA |
509 | if (ptid_equal (inferior_ptid, null_ptid)) |
510 | return; | |
511 | ||
512 | inf = current_inferior (); | |
513 | ||
a3f17187 | 514 | printf_filtered (_("Inferior's terminal status (currently saved by GDB):\n")); |
c906108c SS |
515 | |
516 | /* First the fcntl flags. */ | |
517 | { | |
518 | int flags; | |
c5aa993b | 519 | |
7e1789f5 | 520 | flags = inf->terminal_info->tflags; |
c906108c SS |
521 | |
522 | printf_filtered ("File descriptor flags = "); | |
523 | ||
524 | #ifndef O_ACCMODE | |
525 | #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) | |
526 | #endif | |
527 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug */ | |
528 | switch (flags & (O_ACCMODE)) | |
529 | { | |
c5aa993b JM |
530 | case O_RDONLY: |
531 | printf_filtered ("O_RDONLY"); | |
532 | break; | |
533 | case O_WRONLY: | |
534 | printf_filtered ("O_WRONLY"); | |
535 | break; | |
536 | case O_RDWR: | |
537 | printf_filtered ("O_RDWR"); | |
538 | break; | |
c906108c SS |
539 | } |
540 | flags &= ~(O_ACCMODE); | |
541 | ||
542 | #ifdef O_NONBLOCK | |
c5aa993b | 543 | if (flags & O_NONBLOCK) |
c906108c SS |
544 | printf_filtered (" | O_NONBLOCK"); |
545 | flags &= ~O_NONBLOCK; | |
546 | #endif | |
c5aa993b | 547 | |
c906108c SS |
548 | #if defined (O_NDELAY) |
549 | /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will | |
550 | print it as O_NONBLOCK, which is good cause that is what POSIX | |
551 | has, and the flag will already be cleared by the time we get here. */ | |
552 | if (flags & O_NDELAY) | |
553 | printf_filtered (" | O_NDELAY"); | |
554 | flags &= ~O_NDELAY; | |
555 | #endif | |
556 | ||
557 | if (flags & O_APPEND) | |
558 | printf_filtered (" | O_APPEND"); | |
559 | flags &= ~O_APPEND; | |
560 | ||
561 | #if defined (O_BINARY) | |
562 | if (flags & O_BINARY) | |
563 | printf_filtered (" | O_BINARY"); | |
564 | flags &= ~O_BINARY; | |
565 | #endif | |
566 | ||
567 | if (flags) | |
568 | printf_filtered (" | 0x%x", flags); | |
569 | printf_filtered ("\n"); | |
570 | } | |
571 | ||
572 | #ifdef PROCESS_GROUP_TYPE | |
2acceee2 | 573 | printf_filtered ("Process group = %d\n", |
7e1789f5 | 574 | (int) inf->terminal_info->process_group); |
c906108c SS |
575 | #endif |
576 | ||
7e1789f5 PA |
577 | serial_print_tty_state (stdin_serial, |
578 | inf->terminal_info->ttystate, | |
579 | gdb_stdout); | |
c906108c SS |
580 | } |
581 | \f | |
582 | /* NEW_TTY_PREFORK is called before forking a new child process, | |
583 | so we can record the state of ttys in the child to be formed. | |
584 | TTYNAME is null if we are to share the terminal with gdb; | |
585 | or points to a string containing the name of the desired tty. | |
586 | ||
587 | NEW_TTY is called in new child processes under Unix, which will | |
588 | become debugger target processes. This actually switches to | |
589 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
590 | ||
591 | void | |
3cb3b8df | 592 | new_tty_prefork (const char *ttyname) |
c906108c SS |
593 | { |
594 | /* Save the name for later, for determining whether we and the child | |
595 | are sharing a tty. */ | |
596 | inferior_thisrun_terminal = ttyname; | |
597 | } | |
598 | ||
bf1d7d9c JB |
599 | |
600 | /* If RESULT, assumed to be the return value from a system call, is | |
601 | negative, print the error message indicated by errno and exit. | |
602 | MSG should identify the operation that failed. */ | |
603 | static void | |
604 | check_syscall (const char *msg, int result) | |
605 | { | |
606 | if (result < 0) | |
607 | { | |
608 | print_sys_errmsg (msg, errno); | |
609 | _exit (1); | |
610 | } | |
611 | } | |
612 | ||
c906108c | 613 | void |
fba45db2 | 614 | new_tty (void) |
c906108c | 615 | { |
52f0bd74 | 616 | int tty; |
c906108c SS |
617 | |
618 | if (inferior_thisrun_terminal == 0) | |
619 | return; | |
620 | #if !defined(__GO32__) && !defined(_WIN32) | |
621 | #ifdef TIOCNOTTY | |
622 | /* Disconnect the child process from our controlling terminal. On some | |
623 | systems (SVR4 for example), this may cause a SIGTTOU, so temporarily | |
624 | ignore SIGTTOU. */ | |
c5aa993b | 625 | tty = open ("/dev/tty", O_RDWR); |
c906108c SS |
626 | if (tty > 0) |
627 | { | |
628 | void (*osigttou) (); | |
629 | ||
c5aa993b JM |
630 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
631 | ioctl (tty, TIOCNOTTY, 0); | |
632 | close (tty); | |
633 | signal (SIGTTOU, osigttou); | |
c906108c SS |
634 | } |
635 | #endif | |
636 | ||
637 | /* Now open the specified new terminal. */ | |
c5aa993b | 638 | tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
bf1d7d9c | 639 | check_syscall (inferior_thisrun_terminal, tty); |
c906108c SS |
640 | |
641 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
642 | if (tty != 0) | |
c5aa993b JM |
643 | { |
644 | close (0); | |
bf1d7d9c | 645 | check_syscall ("dup'ing tty into fd 0", dup (tty)); |
c5aa993b | 646 | } |
c906108c | 647 | if (tty != 1) |
c5aa993b JM |
648 | { |
649 | close (1); | |
bf1d7d9c | 650 | check_syscall ("dup'ing tty into fd 1", dup (tty)); |
c5aa993b | 651 | } |
c906108c | 652 | if (tty != 2) |
c5aa993b JM |
653 | { |
654 | close (2); | |
bf1d7d9c | 655 | check_syscall ("dup'ing tty into fd 2", dup (tty)); |
c5aa993b | 656 | } |
83116857 TJB |
657 | |
658 | #ifdef TIOCSCTTY | |
659 | /* Make tty our new controlling terminal. */ | |
660 | if (ioctl (tty, TIOCSCTTY, 0) == -1) | |
661 | /* Mention GDB in warning because it will appear in the inferior's | |
662 | terminal instead of GDB's. */ | |
663 | warning ("GDB: Failed to set controlling terminal: %s", | |
664 | safe_strerror (errno)); | |
665 | #endif | |
666 | ||
c906108c | 667 | if (tty > 2) |
c5aa993b JM |
668 | close (tty); |
669 | #endif /* !go32 && !win32 */ | |
c906108c SS |
670 | } |
671 | \f | |
672 | /* Kill the inferior process. Make us have no inferior. */ | |
673 | ||
c906108c | 674 | static void |
fba45db2 | 675 | kill_command (char *arg, int from_tty) |
c906108c | 676 | { |
39f77062 | 677 | /* FIXME: This should not really be inferior_ptid (or target_has_execution). |
c906108c SS |
678 | It should be a distinct flag that indicates that a target is active, cuz |
679 | some targets don't have processes! */ | |
680 | ||
39f77062 | 681 | if (ptid_equal (inferior_ptid, null_ptid)) |
8a3fe4f8 | 682 | error (_("The program is not being run.")); |
9e2f0ad4 | 683 | if (!query (_("Kill the program being debugged? "))) |
8a3fe4f8 | 684 | error (_("Not confirmed.")); |
c906108c SS |
685 | target_kill (); |
686 | ||
5a55c295 PA |
687 | /* If the current target interface claims there's still execution, |
688 | then don't mess with threads of other processes. */ | |
689 | if (!target_has_execution) | |
c5aa993b | 690 | { |
5a55c295 PA |
691 | init_thread_list (); /* Destroy thread info */ |
692 | ||
693 | /* Killing off the inferior can leave us with a core file. If | |
694 | so, print the state we are left in. */ | |
695 | if (target_has_stack) | |
696 | { | |
697 | printf_filtered (_("In %s,\n"), target_longname); | |
698 | print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC); | |
699 | } | |
c5aa993b | 700 | } |
ce7d4522 | 701 | bfd_cache_close_all (); |
c906108c SS |
702 | } |
703 | \f | |
704 | /* Call set_sigint_trap when you need to pass a signal on to an attached | |
705 | process when handling SIGINT */ | |
706 | ||
c906108c | 707 | static void |
fba45db2 | 708 | pass_signal (int signo) |
c906108c SS |
709 | { |
710 | #ifndef _WIN32 | |
39f77062 | 711 | kill (PIDGET (inferior_ptid), SIGINT); |
c906108c SS |
712 | #endif |
713 | } | |
714 | ||
c5aa993b | 715 | static void (*osig) (); |
7e1789f5 | 716 | static int osig_set; |
c906108c SS |
717 | |
718 | void | |
fba45db2 | 719 | set_sigint_trap (void) |
c906108c | 720 | { |
181e7f93 | 721 | struct inferior *inf = current_inferior (); |
7e1789f5 | 722 | if (inf->attach_flag || inf->terminal_info->run_terminal) |
c906108c | 723 | { |
c5aa993b | 724 | osig = (void (*)()) signal (SIGINT, pass_signal); |
7e1789f5 | 725 | osig_set = 1; |
c906108c | 726 | } |
7e1789f5 PA |
727 | else |
728 | osig_set = 0; | |
c906108c SS |
729 | } |
730 | ||
731 | void | |
fba45db2 | 732 | clear_sigint_trap (void) |
c906108c | 733 | { |
7e1789f5 | 734 | if (osig_set) |
c906108c SS |
735 | { |
736 | signal (SIGINT, osig); | |
7e1789f5 | 737 | osig_set = 0; |
c906108c SS |
738 | } |
739 | } | |
740 | \f | |
c906108c | 741 | |
83116857 TJB |
742 | /* Create a new session if the inferior will run in a different tty. |
743 | A session is UNIX's way of grouping processes that share a controlling | |
744 | terminal, so a new one is needed if the inferior terminal will be | |
745 | different from GDB's. | |
746 | ||
747 | Returns the session id of the new session, 0 if no session was created | |
748 | or -1 if an error occurred. */ | |
749 | pid_t | |
750 | create_tty_session (void) | |
751 | { | |
752 | #ifdef HAVE_SETSID | |
753 | pid_t ret; | |
754 | ||
755 | if (!job_control || inferior_thisrun_terminal == 0) | |
756 | return 0; | |
757 | ||
758 | ret = setsid (); | |
759 | if (ret == -1) | |
760 | warning ("Failed to create new terminal session: setsid: %s", | |
761 | safe_strerror (errno)); | |
762 | ||
763 | return ret; | |
764 | #else | |
765 | return 0; | |
766 | #endif /* HAVE_SETSID */ | |
767 | } | |
768 | ||
c906108c SS |
769 | /* This is here because this is where we figure out whether we (probably) |
770 | have job control. Just using job_control only does part of it because | |
771 | setpgid or setpgrp might not exist on a system without job control. | |
772 | It might be considered misplaced (on the other hand, process groups and | |
773 | job control are closely related to ttys). | |
774 | ||
775 | For a more clean implementation, in libiberty, put a setpgid which merely | |
776 | calls setpgrp and a setpgrp which does nothing (any system with job control | |
777 | will have one or the other). */ | |
778 | int | |
fba45db2 | 779 | gdb_setpgid (void) |
c906108c SS |
780 | { |
781 | int retval = 0; | |
782 | ||
783 | if (job_control) | |
784 | { | |
0200359f MK |
785 | #if defined (HAVE_TERMIOS) || defined (TIOCGPGRP) |
786 | #ifdef HAVE_SETPGID | |
787 | /* The call setpgid (0, 0) is supposed to work and mean the same | |
788 | thing as this, but on Ultrix 4.2A it fails with EPERM (and | |
c5aa993b | 789 | setpgid (getpid (), getpid ()) succeeds). */ |
c906108c SS |
790 | retval = setpgid (getpid (), getpid ()); |
791 | #else | |
0200359f MK |
792 | #ifdef HAVE_SETPGRP |
793 | #ifdef SETPGRP_VOID | |
c906108c SS |
794 | retval = setpgrp (); |
795 | #else | |
796 | retval = setpgrp (getpid (), getpid ()); | |
0200359f MK |
797 | #endif |
798 | #endif /* HAVE_SETPGRP */ | |
799 | #endif /* HAVE_SETPGID */ | |
800 | #endif /* defined (HAVE_TERMIOS) || defined (TIOCGPGRP) */ | |
c906108c | 801 | } |
0200359f | 802 | |
c906108c SS |
803 | return retval; |
804 | } | |
805 | ||
0ea3f30e DJ |
806 | /* Get all the current tty settings (including whether we have a |
807 | tty at all!). We can't do this in _initialize_inflow because | |
808 | serial_fdopen() won't work until the serial_ops_list is | |
809 | initialized, but we don't want to do it lazily either, so | |
810 | that we can guarantee stdin_serial is opened if there is | |
811 | a terminal. */ | |
812 | void | |
813 | initialize_stdin_serial (void) | |
814 | { | |
815 | stdin_serial = serial_fdopen (0); | |
816 | } | |
817 | ||
c906108c | 818 | void |
fba45db2 | 819 | _initialize_inflow (void) |
c906108c SS |
820 | { |
821 | add_info ("terminal", term_info, | |
1bedd215 | 822 | _("Print inferior's saved terminal status.")); |
c906108c SS |
823 | |
824 | add_com ("kill", class_run, kill_command, | |
1bedd215 | 825 | _("Kill execution of program being debugged.")); |
c906108c | 826 | |
39f77062 | 827 | inferior_ptid = null_ptid; |
c906108c SS |
828 | |
829 | terminal_is_ours = 1; | |
830 | ||
831 | /* OK, figure out whether we have job control. If neither termios nor | |
832 | sgtty (i.e. termio or go32), leave job_control 0. */ | |
833 | ||
834 | #if defined (HAVE_TERMIOS) | |
835 | /* Do all systems with termios have the POSIX way of identifying job | |
836 | control? I hope so. */ | |
837 | #ifdef _POSIX_JOB_CONTROL | |
838 | job_control = 1; | |
839 | #else | |
840 | #ifdef _SC_JOB_CONTROL | |
841 | job_control = sysconf (_SC_JOB_CONTROL); | |
842 | #else | |
c5aa993b JM |
843 | job_control = 0; /* have to assume the worst */ |
844 | #endif /* _SC_JOB_CONTROL */ | |
845 | #endif /* _POSIX_JOB_CONTROL */ | |
846 | #endif /* HAVE_TERMIOS */ | |
c906108c SS |
847 | |
848 | #ifdef HAVE_SGTTY | |
849 | #ifdef TIOCGPGRP | |
850 | job_control = 1; | |
851 | #else | |
852 | job_control = 0; | |
853 | #endif /* TIOCGPGRP */ | |
854 | #endif /* sgtty */ | |
7e1789f5 PA |
855 | |
856 | observer_attach_new_inferior (inflow_new_inferior); | |
857 | observer_attach_inferior_exit (inflow_inferior_exit); | |
c906108c | 858 | } |