Commit | Line | Data |
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c906108c | 1 | /* Low level interface to ptrace, for GDB when running under Unix. |
61baf725 | 2 | Copyright (C) 1986-2017 Free Software Foundation, Inc. |
c906108c | 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 | |
a9762ec7 | 8 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 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 | 16 | You should have received a copy of the GNU General Public License |
a9762ec7 | 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
18 | |
19 | #include "defs.h" | |
20 | #include "frame.h" | |
21 | #include "inferior.h" | |
22 | #include "command.h" | |
c906108c SS |
23 | #include "serial.h" |
24 | #include "terminal.h" | |
25 | #include "target.h" | |
26 | #include "gdbthread.h" | |
7e1789f5 | 27 | #include "observer.h" |
c906108c SS |
28 | #include <signal.h> |
29 | #include <fcntl.h> | |
0ea3f30e | 30 | #include "gdb_select.h" |
c906108c | 31 | |
44270758 | 32 | #include "inflow.h" |
7bfc9434 | 33 | #include "gdbcmd.h" |
be628ab8 | 34 | #include "gdb_termios.h" |
15652511 | 35 | #include "job-control.h" |
c906108c | 36 | |
c2d11a7d JM |
37 | #ifdef HAVE_SYS_IOCTL_H |
38 | #include <sys/ioctl.h> | |
39 | #endif | |
40 | ||
f2acbe1c MK |
41 | #ifndef O_NOCTTY |
42 | #define O_NOCTTY 0 | |
43 | #endif | |
44 | ||
a14ed312 | 45 | static void pass_signal (int); |
c906108c | 46 | |
d6b64346 | 47 | static void child_terminal_ours_1 (int); |
c906108c SS |
48 | \f |
49 | /* Record terminal status separately for debugger and inferior. */ | |
50 | ||
819cc324 | 51 | static struct serial *stdin_serial; |
c906108c | 52 | |
7e1789f5 PA |
53 | /* Terminal related info we need to keep track of. Each inferior |
54 | holds an instance of this structure --- we save it whenever the | |
55 | corresponding inferior stops, and restore it to the foreground | |
56 | inferior when it resumes. */ | |
57 | struct terminal_info | |
58 | { | |
59 | /* The name of the tty (from the `tty' command) that we gave to the | |
60 | inferior when it was started. */ | |
191c4426 | 61 | char *run_terminal; |
7e1789f5 PA |
62 | |
63 | /* TTY state. We save it whenever the inferior stops, and restore | |
64 | it when it resumes. */ | |
65 | serial_ttystate ttystate; | |
66 | ||
67 | #ifdef PROCESS_GROUP_TYPE | |
68 | /* Process group. Saved and restored just like ttystate. */ | |
69 | PROCESS_GROUP_TYPE process_group; | |
70 | #endif | |
c906108c | 71 | |
7e1789f5 PA |
72 | /* fcntl flags. Saved and restored just like ttystate. */ |
73 | int tflags; | |
74 | }; | |
c906108c | 75 | |
7e1789f5 | 76 | /* Our own tty state, which we restore every time we need to deal with |
d9de1fe3 PA |
77 | the terminal. This is set once, when GDB first starts, and then |
78 | whenever we enter/leave TUI mode (gdb_save_tty_state). The | |
79 | settings of flags which readline saves and restores are | |
7e1789f5 PA |
80 | unimportant. */ |
81 | static struct terminal_info our_terminal_info; | |
c906108c | 82 | |
d9de1fe3 PA |
83 | /* Snapshot of the initial tty state taken during initialization of |
84 | GDB, before readline/ncurses have had a chance to change it. This | |
85 | is used as the initial tty state given to each new spawned | |
86 | inferior. Unlike our_terminal_info, this is only ever set | |
87 | once. */ | |
6a06d660 PP |
88 | static serial_ttystate initial_gdb_ttystate; |
89 | ||
6c95b8df PA |
90 | static struct terminal_info *get_inflow_inferior_data (struct inferior *); |
91 | ||
c906108c | 92 | #ifdef PROCESS_GROUP_TYPE |
7e1789f5 PA |
93 | |
94 | /* Return the process group of the current inferior. */ | |
95 | ||
96 | PROCESS_GROUP_TYPE | |
97 | inferior_process_group (void) | |
98 | { | |
6c95b8df | 99 | return get_inflow_inferior_data (current_inferior ())->process_group; |
7e1789f5 | 100 | } |
c906108c SS |
101 | #endif |
102 | ||
103 | /* While the inferior is running, we want SIGINT and SIGQUIT to go to the | |
104 | inferior only. If we have job control, that takes care of it. If not, | |
105 | we save our handlers in these two variables and set SIGINT and SIGQUIT | |
106 | to SIG_IGN. */ | |
107 | ||
a40805d4 PA |
108 | static sighandler_t sigint_ours; |
109 | static sighandler_t sigquit_ours; | |
c906108c | 110 | |
7e1789f5 PA |
111 | /* The name of the tty (from the `tty' command) that we're giving to |
112 | the inferior when starting it up. This is only (and should only | |
191c4426 PA |
113 | be) used as a transient global by new_tty_prefork, |
114 | create_tty_session, new_tty and new_tty_postfork, all called from | |
115 | fork_inferior, while forking a new child. */ | |
3cb3b8df | 116 | static const char *inferior_thisrun_terminal; |
c906108c SS |
117 | |
118 | /* Nonzero if our terminal settings are in effect. Zero if the | |
119 | inferior's settings are in effect. Ignored if !gdb_has_a_terminal | |
120 | (). */ | |
121 | ||
122 | int terminal_is_ours; | |
123 | ||
64a0ac84 PA |
124 | #ifdef PROCESS_GROUP_TYPE |
125 | static PROCESS_GROUP_TYPE | |
126 | gdb_getpgrp (void) | |
127 | { | |
128 | int process_group = -1; | |
abbb1732 | 129 | |
64a0ac84 PA |
130 | #ifdef HAVE_TERMIOS |
131 | process_group = tcgetpgrp (0); | |
132 | #endif | |
133 | #ifdef HAVE_TERMIO | |
134 | process_group = getpgrp (); | |
135 | #endif | |
136 | #ifdef HAVE_SGTTY | |
137 | ioctl (0, TIOCGPGRP, &process_group); | |
138 | #endif | |
139 | return process_group; | |
140 | } | |
141 | #endif | |
142 | ||
d9de1fe3 | 143 | /* See terminal.h. */ |
ea42d6f8 | 144 | |
6a06d660 PP |
145 | void |
146 | set_initial_gdb_ttystate (void) | |
147 | { | |
d9de1fe3 PA |
148 | /* Note we can't do any of this in _initialize_inflow because at |
149 | that point stdin_serial has not been created yet. */ | |
150 | ||
6a06d660 | 151 | initial_gdb_ttystate = serial_get_tty_state (stdin_serial); |
6a06d660 | 152 | |
d9de1fe3 | 153 | if (initial_gdb_ttystate != NULL) |
c906108c | 154 | { |
d9de1fe3 PA |
155 | our_terminal_info.ttystate |
156 | = serial_copy_tty_state (stdin_serial, initial_gdb_ttystate); | |
c906108c | 157 | #ifdef F_GETFL |
7e1789f5 | 158 | our_terminal_info.tflags = fcntl (0, F_GETFL, 0); |
c906108c | 159 | #endif |
807bddf3 | 160 | #ifdef PROCESS_GROUP_TYPE |
d9de1fe3 | 161 | our_terminal_info.process_group = gdb_getpgrp (); |
807bddf3 | 162 | #endif |
c906108c SS |
163 | } |
164 | } | |
165 | ||
d9de1fe3 PA |
166 | /* Does GDB have a terminal (on stdin)? */ |
167 | ||
168 | static int | |
169 | gdb_has_a_terminal (void) | |
170 | { | |
171 | return initial_gdb_ttystate != NULL; | |
172 | } | |
173 | ||
c906108c SS |
174 | /* Macro for printing errors from ioctl operations */ |
175 | ||
176 | #define OOPSY(what) \ | |
177 | if (result == -1) \ | |
178 | fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ | |
dc672865 | 179 | what, safe_strerror (errno)) |
c906108c | 180 | |
c906108c SS |
181 | /* Initialize the terminal settings we record for the inferior, |
182 | before we actually run the inferior. */ | |
183 | ||
184 | void | |
d6b64346 | 185 | child_terminal_init_with_pgrp (int pgrp) |
c906108c | 186 | { |
6f64ef53 PA |
187 | struct inferior *inf = current_inferior (); |
188 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); | |
189 | ||
190 | #ifdef PROCESS_GROUP_TYPE | |
191 | /* Store the process group even without a terminal as it is used not | |
192 | only to reset the tty foreground process group, but also to | |
193 | interrupt the inferior. */ | |
194 | tinfo->process_group = pgrp; | |
195 | #endif | |
196 | ||
c906108c SS |
197 | if (gdb_has_a_terminal ()) |
198 | { | |
6c95b8df | 199 | xfree (tinfo->ttystate); |
1e182ce8 | 200 | tinfo->ttystate = serial_copy_tty_state (stdin_serial, |
6a06d660 | 201 | initial_gdb_ttystate); |
c906108c | 202 | |
c906108c | 203 | /* Make sure that next time we call terminal_inferior (which will be |
c5aa993b JM |
204 | before the program runs, as it needs to be), we install the new |
205 | process group. */ | |
c906108c SS |
206 | terminal_is_ours = 1; |
207 | } | |
208 | } | |
209 | ||
a790ad35 SC |
210 | /* Save the terminal settings again. This is necessary for the TUI |
211 | when it switches to TUI or non-TUI mode; curses changes the terminal | |
212 | and gdb must be able to restore it correctly. */ | |
213 | ||
214 | void | |
3278a9f5 | 215 | gdb_save_tty_state (void) |
a790ad35 SC |
216 | { |
217 | if (gdb_has_a_terminal ()) | |
218 | { | |
7e1789f5 PA |
219 | xfree (our_terminal_info.ttystate); |
220 | our_terminal_info.ttystate = serial_get_tty_state (stdin_serial); | |
a790ad35 SC |
221 | } |
222 | } | |
223 | ||
c906108c | 224 | void |
d6b64346 | 225 | child_terminal_init (struct target_ops *self) |
c906108c SS |
226 | { |
227 | #ifdef PROCESS_GROUP_TYPE | |
d6b64346 | 228 | /* This is for Lynx, and should be cleaned up by having Lynx be a |
223ffa71 | 229 | separate debugging target with a version of target_terminal::init |
d6b64346 PA |
230 | which passes in the process group to a generic routine which does |
231 | all the work (and the non-threaded child_terminal_init can just | |
232 | pass in inferior_ptid to the same routine). */ | |
c906108c | 233 | /* We assume INFERIOR_PID is also the child's process group. */ |
d6b64346 | 234 | child_terminal_init_with_pgrp (ptid_get_pid (inferior_ptid)); |
c906108c SS |
235 | #endif /* PROCESS_GROUP_TYPE */ |
236 | } | |
237 | ||
238 | /* Put the inferior's terminal settings into effect. | |
4d4ca2a1 DE |
239 | This is preparation for starting or resuming the inferior. |
240 | ||
241 | N.B. Targets that want to use this with async support must build that | |
242 | support on top of this (e.g., the caller still needs to remove stdin | |
243 | from the event loop). E.g., see linux_nat_terminal_inferior. */ | |
c906108c SS |
244 | |
245 | void | |
d6b64346 | 246 | child_terminal_inferior (struct target_ops *self) |
c906108c | 247 | { |
7e1789f5 | 248 | struct inferior *inf; |
6c95b8df | 249 | struct terminal_info *tinfo; |
7e1789f5 PA |
250 | |
251 | if (!terminal_is_ours) | |
252 | return; | |
253 | ||
254 | inf = current_inferior (); | |
6c95b8df | 255 | tinfo = get_inflow_inferior_data (inf); |
7e1789f5 PA |
256 | |
257 | if (gdb_has_a_terminal () | |
6c95b8df PA |
258 | && tinfo->ttystate != NULL |
259 | && tinfo->run_terminal == NULL) | |
c906108c SS |
260 | { |
261 | int result; | |
262 | ||
263 | #ifdef F_GETFL | |
264 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
265 | places we use F_SETFL, so I'm inclined to think perhaps there |
266 | is some reason, however perverse. Perhaps not though... */ | |
6c95b8df PA |
267 | result = fcntl (0, F_SETFL, tinfo->tflags); |
268 | result = fcntl (0, F_SETFL, tinfo->tflags); | |
c906108c SS |
269 | OOPSY ("fcntl F_SETFL"); |
270 | #endif | |
271 | ||
272 | /* Because we were careful to not change in or out of raw mode in | |
c5aa993b JM |
273 | terminal_ours, we will not change in our out of raw mode with |
274 | this call, so we don't flush any input. */ | |
7e1789f5 | 275 | result = serial_set_tty_state (stdin_serial, |
6c95b8df | 276 | tinfo->ttystate); |
c906108c SS |
277 | OOPSY ("setting tty state"); |
278 | ||
279 | if (!job_control) | |
280 | { | |
a40805d4 | 281 | sigint_ours = signal (SIGINT, SIG_IGN); |
c906108c | 282 | #ifdef SIGQUIT |
a40805d4 | 283 | sigquit_ours = signal (SIGQUIT, SIG_IGN); |
c906108c SS |
284 | #endif |
285 | } | |
286 | ||
287 | /* If attach_flag is set, we don't know whether we are sharing a | |
c5aa993b JM |
288 | terminal with the inferior or not. (attaching a process |
289 | without a terminal is one case where we do not; attaching a | |
290 | process which we ran from the same shell as GDB via `&' is | |
291 | one case where we do, I think (but perhaps this is not | |
292 | `sharing' in the sense that we need to save and restore tty | |
293 | state)). I don't know if there is any way to tell whether we | |
294 | are sharing a terminal. So what we do is to go through all | |
295 | the saving and restoring of the tty state, but ignore errors | |
296 | setting the process group, which will happen if we are not | |
297 | sharing a terminal). */ | |
c906108c SS |
298 | |
299 | if (job_control) | |
300 | { | |
301 | #ifdef HAVE_TERMIOS | |
6c95b8df | 302 | result = tcsetpgrp (0, tinfo->process_group); |
181e7f93 | 303 | if (!inf->attach_flag) |
c906108c SS |
304 | OOPSY ("tcsetpgrp"); |
305 | #endif | |
306 | ||
307 | #ifdef HAVE_SGTTY | |
6c95b8df | 308 | result = ioctl (0, TIOCSPGRP, &tinfo->process_group); |
181e7f93 | 309 | if (!inf->attach_flag) |
c906108c SS |
310 | OOPSY ("TIOCSPGRP"); |
311 | #endif | |
312 | } | |
313 | ||
314 | } | |
315 | terminal_is_ours = 0; | |
316 | } | |
317 | ||
318 | /* Put some of our terminal settings into effect, | |
319 | enough to get proper results from our output, | |
320 | but do not change into or out of RAW mode | |
321 | so that no input is discarded. | |
322 | ||
323 | After doing this, either terminal_ours or terminal_inferior | |
4d4ca2a1 DE |
324 | should be called to get back to a normal state of affairs. |
325 | ||
326 | N.B. The implementation is (currently) no different than | |
327 | child_terminal_ours. See child_terminal_ours_1. */ | |
c906108c SS |
328 | |
329 | void | |
d6b64346 | 330 | child_terminal_ours_for_output (struct target_ops *self) |
c906108c | 331 | { |
d6b64346 | 332 | child_terminal_ours_1 (1); |
c906108c SS |
333 | } |
334 | ||
335 | /* Put our terminal settings into effect. | |
336 | First record the inferior's terminal settings | |
4d4ca2a1 DE |
337 | so they can be restored properly later. |
338 | ||
339 | N.B. Targets that want to use this with async support must build that | |
340 | support on top of this (e.g., the caller still needs to add stdin to the | |
341 | event loop). E.g., see linux_nat_terminal_ours. */ | |
c906108c SS |
342 | |
343 | void | |
d6b64346 | 344 | child_terminal_ours (struct target_ops *self) |
c906108c | 345 | { |
d6b64346 | 346 | child_terminal_ours_1 (0); |
c906108c SS |
347 | } |
348 | ||
349 | /* output_only is not used, and should not be used unless we introduce | |
350 | separate terminal_is_ours and terminal_is_ours_for_output | |
351 | flags. */ | |
352 | ||
353 | static void | |
d6b64346 | 354 | child_terminal_ours_1 (int output_only) |
c906108c | 355 | { |
7e1789f5 | 356 | struct inferior *inf; |
6c95b8df | 357 | struct terminal_info *tinfo; |
7e1789f5 PA |
358 | |
359 | if (terminal_is_ours) | |
360 | return; | |
361 | ||
d9d2d8b6 PA |
362 | terminal_is_ours = 1; |
363 | ||
7e1789f5 | 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 (); | |
6c95b8df | 370 | tinfo = get_inflow_inferior_data (inf); |
7e1789f5 | 371 | |
6c95b8df | 372 | if (tinfo->run_terminal != NULL || gdb_has_a_terminal () == 0) |
c906108c | 373 | return; |
a579cd9a | 374 | else |
c906108c | 375 | { |
4b69c284 | 376 | #ifdef SIGTTOU |
c906108c | 377 | /* Ignore this signal since it will happen when we try to set the |
c5aa993b | 378 | pgrp. */ |
a40805d4 | 379 | sighandler_t osigttou = NULL; |
4b69c284 | 380 | #endif |
821fc4ae | 381 | int result ATTRIBUTE_UNUSED; |
c906108c | 382 | |
c906108c SS |
383 | #ifdef SIGTTOU |
384 | if (job_control) | |
a40805d4 | 385 | osigttou = signal (SIGTTOU, SIG_IGN); |
c906108c SS |
386 | #endif |
387 | ||
6c95b8df PA |
388 | xfree (tinfo->ttystate); |
389 | tinfo->ttystate = serial_get_tty_state (stdin_serial); | |
64a0ac84 | 390 | |
49a834f9 | 391 | #ifdef PROCESS_GROUP_TYPE |
181e7f93 | 392 | if (!inf->attach_flag) |
64a0ac84 PA |
393 | /* If setpgrp failed in terminal_inferior, this would give us |
394 | our process group instead of the inferior's. See | |
395 | terminal_inferior for details. */ | |
6c95b8df | 396 | tinfo->process_group = gdb_getpgrp (); |
49a834f9 | 397 | #endif |
c906108c SS |
398 | |
399 | /* Here we used to set ICANON in our ttystate, but I believe this | |
c5aa993b JM |
400 | was an artifact from before when we used readline. Readline sets |
401 | the tty state when it needs to. | |
402 | FIXME-maybe: However, query() expects non-raw mode and doesn't | |
403 | use readline. Maybe query should use readline (on the other hand, | |
404 | this only matters for HAVE_SGTTY, not termio or termios, I think). */ | |
c906108c SS |
405 | |
406 | /* Set tty state to our_ttystate. We don't change in our out of raw | |
c5aa993b JM |
407 | mode, to avoid flushing input. We need to do the same thing |
408 | regardless of output_only, because we don't have separate | |
409 | terminal_is_ours and terminal_is_ours_for_output flags. It's OK, | |
1777feb0 MS |
410 | though, since readline will deal with raw mode when/if it needs |
411 | to. */ | |
c906108c | 412 | |
7e1789f5 | 413 | serial_noflush_set_tty_state (stdin_serial, our_terminal_info.ttystate, |
6c95b8df | 414 | tinfo->ttystate); |
c906108c SS |
415 | |
416 | if (job_control) | |
417 | { | |
418 | #ifdef HAVE_TERMIOS | |
7e1789f5 | 419 | result = tcsetpgrp (0, our_terminal_info.process_group); |
c906108c SS |
420 | #if 0 |
421 | /* This fails on Ultrix with EINVAL if you run the testsuite | |
422 | in the background with nohup, and then log out. GDB never | |
423 | used to check for an error here, so perhaps there are other | |
424 | such situations as well. */ | |
425 | if (result == -1) | |
3e43a32a | 426 | fprintf_unfiltered (gdb_stderr, |
d6b64346 | 427 | "[tcsetpgrp failed in child_terminal_ours: %s]\n", |
dc672865 | 428 | safe_strerror (errno)); |
c906108c SS |
429 | #endif |
430 | #endif /* termios */ | |
431 | ||
432 | #ifdef HAVE_SGTTY | |
7e1789f5 | 433 | result = ioctl (0, TIOCSPGRP, &our_terminal_info.process_group); |
c906108c SS |
434 | #endif |
435 | } | |
436 | ||
437 | #ifdef SIGTTOU | |
438 | if (job_control) | |
439 | signal (SIGTTOU, osigttou); | |
440 | #endif | |
441 | ||
442 | if (!job_control) | |
443 | { | |
444 | signal (SIGINT, sigint_ours); | |
445 | #ifdef SIGQUIT | |
446 | signal (SIGQUIT, sigquit_ours); | |
447 | #endif | |
448 | } | |
449 | ||
450 | #ifdef F_GETFL | |
6c95b8df | 451 | tinfo->tflags = fcntl (0, F_GETFL, 0); |
c906108c SS |
452 | |
453 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
454 | places we use F_SETFL, so I'm inclined to think perhaps there |
455 | is some reason, however perverse. Perhaps not though... */ | |
7e1789f5 PA |
456 | result = fcntl (0, F_SETFL, our_terminal_info.tflags); |
457 | result = fcntl (0, F_SETFL, our_terminal_info.tflags); | |
c906108c | 458 | #endif |
c906108c SS |
459 | } |
460 | } | |
461 | ||
6c95b8df PA |
462 | /* Per-inferior data key. */ |
463 | static const struct inferior_data *inflow_inferior_data; | |
7e1789f5 PA |
464 | |
465 | static void | |
6c95b8df | 466 | inflow_inferior_data_cleanup (struct inferior *inf, void *arg) |
7e1789f5 | 467 | { |
9a3c8263 | 468 | struct terminal_info *info = (struct terminal_info *) arg; |
6c95b8df | 469 | |
487ad57c YQ |
470 | xfree (info->run_terminal); |
471 | xfree (info->ttystate); | |
472 | xfree (info); | |
6c95b8df PA |
473 | } |
474 | ||
475 | /* Get the current svr4 data. If none is found yet, add it now. This | |
476 | function always returns a valid object. */ | |
477 | ||
478 | static struct terminal_info * | |
479 | get_inflow_inferior_data (struct inferior *inf) | |
480 | { | |
481 | struct terminal_info *info; | |
482 | ||
9a3c8263 | 483 | info = (struct terminal_info *) inferior_data (inf, inflow_inferior_data); |
6c95b8df PA |
484 | if (info == NULL) |
485 | { | |
41bf6aca | 486 | info = XCNEW (struct terminal_info); |
6c95b8df PA |
487 | set_inferior_data (inf, inflow_inferior_data, info); |
488 | } | |
7e1789f5 | 489 | |
6c95b8df | 490 | return info; |
7e1789f5 PA |
491 | } |
492 | ||
493 | /* This is a "inferior_exit" observer. Releases the TERMINAL_INFO member | |
494 | of the inferior structure. This field is private to inflow.c, and | |
495 | its type is opaque to the rest of GDB. PID is the target pid of | |
496 | the inferior that is about to be removed from the inferior | |
497 | list. */ | |
498 | ||
499 | static void | |
a79b8f6e | 500 | inflow_inferior_exit (struct inferior *inf) |
7e1789f5 | 501 | { |
6c95b8df | 502 | struct terminal_info *info; |
7e1789f5 | 503 | |
9a3c8263 | 504 | info = (struct terminal_info *) inferior_data (inf, inflow_inferior_data); |
6c95b8df PA |
505 | if (info != NULL) |
506 | { | |
507 | xfree (info->run_terminal); | |
1e182ce8 | 508 | xfree (info->ttystate); |
6c95b8df PA |
509 | xfree (info); |
510 | set_inferior_data (inf, inflow_inferior_data, NULL); | |
511 | } | |
7e1789f5 PA |
512 | } |
513 | ||
191c4426 PA |
514 | void |
515 | copy_terminal_info (struct inferior *to, struct inferior *from) | |
516 | { | |
6c95b8df PA |
517 | struct terminal_info *tinfo_to, *tinfo_from; |
518 | ||
519 | tinfo_to = get_inflow_inferior_data (to); | |
520 | tinfo_from = get_inflow_inferior_data (from); | |
1e182ce8 UW |
521 | |
522 | xfree (tinfo_to->run_terminal); | |
523 | xfree (tinfo_to->ttystate); | |
524 | ||
6c95b8df | 525 | *tinfo_to = *tinfo_from; |
1e182ce8 | 526 | |
6c95b8df PA |
527 | if (tinfo_from->run_terminal) |
528 | tinfo_to->run_terminal | |
529 | = xstrdup (tinfo_from->run_terminal); | |
1e182ce8 UW |
530 | |
531 | if (tinfo_from->ttystate) | |
532 | tinfo_to->ttystate | |
533 | = serial_copy_tty_state (stdin_serial, tinfo_from->ttystate); | |
191c4426 PA |
534 | } |
535 | ||
c906108c | 536 | void |
11db9430 | 537 | info_terminal_command (char *arg, int from_tty) |
c906108c | 538 | { |
223ffa71 | 539 | target_terminal::info (arg, from_tty); |
c906108c SS |
540 | } |
541 | ||
c906108c | 542 | void |
0a4f40a2 | 543 | child_terminal_info (struct target_ops *self, const char *args, int from_tty) |
c906108c | 544 | { |
7e1789f5 | 545 | struct inferior *inf; |
6c95b8df | 546 | struct terminal_info *tinfo; |
7e1789f5 | 547 | |
c906108c SS |
548 | if (!gdb_has_a_terminal ()) |
549 | { | |
a3f17187 | 550 | printf_filtered (_("This GDB does not control a terminal.\n")); |
c906108c SS |
551 | return; |
552 | } | |
553 | ||
7e1789f5 PA |
554 | if (ptid_equal (inferior_ptid, null_ptid)) |
555 | return; | |
556 | ||
557 | inf = current_inferior (); | |
6c95b8df | 558 | tinfo = get_inflow_inferior_data (inf); |
7e1789f5 | 559 | |
3e43a32a MS |
560 | printf_filtered (_("Inferior's terminal status " |
561 | "(currently saved by GDB):\n")); | |
c906108c SS |
562 | |
563 | /* First the fcntl flags. */ | |
564 | { | |
565 | int flags; | |
c5aa993b | 566 | |
6c95b8df | 567 | flags = tinfo->tflags; |
c906108c SS |
568 | |
569 | printf_filtered ("File descriptor flags = "); | |
570 | ||
571 | #ifndef O_ACCMODE | |
572 | #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) | |
573 | #endif | |
1777feb0 | 574 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug. */ |
c906108c SS |
575 | switch (flags & (O_ACCMODE)) |
576 | { | |
c5aa993b JM |
577 | case O_RDONLY: |
578 | printf_filtered ("O_RDONLY"); | |
579 | break; | |
580 | case O_WRONLY: | |
581 | printf_filtered ("O_WRONLY"); | |
582 | break; | |
583 | case O_RDWR: | |
584 | printf_filtered ("O_RDWR"); | |
585 | break; | |
c906108c SS |
586 | } |
587 | flags &= ~(O_ACCMODE); | |
588 | ||
589 | #ifdef O_NONBLOCK | |
c5aa993b | 590 | if (flags & O_NONBLOCK) |
c906108c SS |
591 | printf_filtered (" | O_NONBLOCK"); |
592 | flags &= ~O_NONBLOCK; | |
593 | #endif | |
c5aa993b | 594 | |
c906108c SS |
595 | #if defined (O_NDELAY) |
596 | /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will | |
597 | print it as O_NONBLOCK, which is good cause that is what POSIX | |
598 | has, and the flag will already be cleared by the time we get here. */ | |
599 | if (flags & O_NDELAY) | |
600 | printf_filtered (" | O_NDELAY"); | |
601 | flags &= ~O_NDELAY; | |
602 | #endif | |
603 | ||
604 | if (flags & O_APPEND) | |
605 | printf_filtered (" | O_APPEND"); | |
606 | flags &= ~O_APPEND; | |
607 | ||
608 | #if defined (O_BINARY) | |
609 | if (flags & O_BINARY) | |
610 | printf_filtered (" | O_BINARY"); | |
611 | flags &= ~O_BINARY; | |
612 | #endif | |
613 | ||
614 | if (flags) | |
615 | printf_filtered (" | 0x%x", flags); | |
616 | printf_filtered ("\n"); | |
617 | } | |
618 | ||
619 | #ifdef PROCESS_GROUP_TYPE | |
6c95b8df | 620 | printf_filtered ("Process group = %d\n", (int) tinfo->process_group); |
c906108c SS |
621 | #endif |
622 | ||
6c95b8df | 623 | serial_print_tty_state (stdin_serial, tinfo->ttystate, gdb_stdout); |
c906108c SS |
624 | } |
625 | \f | |
626 | /* NEW_TTY_PREFORK is called before forking a new child process, | |
627 | so we can record the state of ttys in the child to be formed. | |
628 | TTYNAME is null if we are to share the terminal with gdb; | |
629 | or points to a string containing the name of the desired tty. | |
630 | ||
631 | NEW_TTY is called in new child processes under Unix, which will | |
632 | become debugger target processes. This actually switches to | |
633 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
634 | ||
635 | void | |
3cb3b8df | 636 | new_tty_prefork (const char *ttyname) |
c906108c SS |
637 | { |
638 | /* Save the name for later, for determining whether we and the child | |
639 | are sharing a tty. */ | |
640 | inferior_thisrun_terminal = ttyname; | |
641 | } | |
642 | ||
e6d088ec | 643 | #if !defined(__GO32__) && !defined(_WIN32) |
bf1d7d9c JB |
644 | /* If RESULT, assumed to be the return value from a system call, is |
645 | negative, print the error message indicated by errno and exit. | |
646 | MSG should identify the operation that failed. */ | |
647 | static void | |
648 | check_syscall (const char *msg, int result) | |
649 | { | |
650 | if (result < 0) | |
651 | { | |
652 | print_sys_errmsg (msg, errno); | |
653 | _exit (1); | |
654 | } | |
655 | } | |
e6d088ec | 656 | #endif |
bf1d7d9c | 657 | |
c906108c | 658 | void |
fba45db2 | 659 | new_tty (void) |
c906108c | 660 | { |
52f0bd74 | 661 | int tty; |
c906108c SS |
662 | |
663 | if (inferior_thisrun_terminal == 0) | |
664 | return; | |
665 | #if !defined(__GO32__) && !defined(_WIN32) | |
666 | #ifdef TIOCNOTTY | |
667 | /* Disconnect the child process from our controlling terminal. On some | |
668 | systems (SVR4 for example), this may cause a SIGTTOU, so temporarily | |
1777feb0 | 669 | ignore SIGTTOU. */ |
c5aa993b | 670 | tty = open ("/dev/tty", O_RDWR); |
c906108c SS |
671 | if (tty > 0) |
672 | { | |
a40805d4 | 673 | sighandler_t osigttou; |
c906108c | 674 | |
a40805d4 | 675 | osigttou = signal (SIGTTOU, SIG_IGN); |
c5aa993b JM |
676 | ioctl (tty, TIOCNOTTY, 0); |
677 | close (tty); | |
678 | signal (SIGTTOU, osigttou); | |
c906108c SS |
679 | } |
680 | #endif | |
681 | ||
682 | /* Now open the specified new terminal. */ | |
c5aa993b | 683 | tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
bf1d7d9c | 684 | check_syscall (inferior_thisrun_terminal, tty); |
c906108c SS |
685 | |
686 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
687 | if (tty != 0) | |
c5aa993b JM |
688 | { |
689 | close (0); | |
bf1d7d9c | 690 | check_syscall ("dup'ing tty into fd 0", dup (tty)); |
c5aa993b | 691 | } |
c906108c | 692 | if (tty != 1) |
c5aa993b JM |
693 | { |
694 | close (1); | |
bf1d7d9c | 695 | check_syscall ("dup'ing tty into fd 1", dup (tty)); |
c5aa993b | 696 | } |
c906108c | 697 | if (tty != 2) |
c5aa993b JM |
698 | { |
699 | close (2); | |
bf1d7d9c | 700 | check_syscall ("dup'ing tty into fd 2", dup (tty)); |
c5aa993b | 701 | } |
83116857 TJB |
702 | |
703 | #ifdef TIOCSCTTY | |
704 | /* Make tty our new controlling terminal. */ | |
705 | if (ioctl (tty, TIOCSCTTY, 0) == -1) | |
706 | /* Mention GDB in warning because it will appear in the inferior's | |
707 | terminal instead of GDB's. */ | |
a73c6dcd | 708 | warning (_("GDB: Failed to set controlling terminal: %s"), |
83116857 TJB |
709 | safe_strerror (errno)); |
710 | #endif | |
711 | ||
c906108c | 712 | if (tty > 2) |
c5aa993b JM |
713 | close (tty); |
714 | #endif /* !go32 && !win32 */ | |
c906108c | 715 | } |
191c4426 PA |
716 | |
717 | /* NEW_TTY_POSTFORK is called after forking a new child process, and | |
718 | adding it to the inferior table, to store the TTYNAME being used by | |
719 | the child, or null if it sharing the terminal with gdb. */ | |
720 | ||
721 | void | |
722 | new_tty_postfork (void) | |
723 | { | |
724 | /* Save the name for later, for determining whether we and the child | |
725 | are sharing a tty. */ | |
726 | ||
727 | if (inferior_thisrun_terminal) | |
6c95b8df PA |
728 | { |
729 | struct inferior *inf = current_inferior (); | |
730 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); | |
731 | ||
732 | tinfo->run_terminal = xstrdup (inferior_thisrun_terminal); | |
733 | } | |
191c4426 PA |
734 | |
735 | inferior_thisrun_terminal = NULL; | |
736 | } | |
737 | ||
c906108c SS |
738 | \f |
739 | /* Call set_sigint_trap when you need to pass a signal on to an attached | |
1777feb0 | 740 | process when handling SIGINT. */ |
c906108c | 741 | |
c906108c | 742 | static void |
fba45db2 | 743 | pass_signal (int signo) |
c906108c SS |
744 | { |
745 | #ifndef _WIN32 | |
dfd4cc63 | 746 | kill (ptid_get_pid (inferior_ptid), SIGINT); |
c906108c SS |
747 | #endif |
748 | } | |
749 | ||
a40805d4 | 750 | static sighandler_t osig; |
7e1789f5 | 751 | static int osig_set; |
c906108c SS |
752 | |
753 | void | |
fba45db2 | 754 | set_sigint_trap (void) |
c906108c | 755 | { |
181e7f93 | 756 | struct inferior *inf = current_inferior (); |
6c95b8df PA |
757 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); |
758 | ||
759 | if (inf->attach_flag || tinfo->run_terminal) | |
c906108c | 760 | { |
a40805d4 | 761 | osig = signal (SIGINT, pass_signal); |
7e1789f5 | 762 | osig_set = 1; |
c906108c | 763 | } |
7e1789f5 PA |
764 | else |
765 | osig_set = 0; | |
c906108c SS |
766 | } |
767 | ||
768 | void | |
fba45db2 | 769 | clear_sigint_trap (void) |
c906108c | 770 | { |
7e1789f5 | 771 | if (osig_set) |
c906108c SS |
772 | { |
773 | signal (SIGINT, osig); | |
7e1789f5 | 774 | osig_set = 0; |
c906108c SS |
775 | } |
776 | } | |
777 | \f | |
c906108c | 778 | |
83116857 TJB |
779 | /* Create a new session if the inferior will run in a different tty. |
780 | A session is UNIX's way of grouping processes that share a controlling | |
781 | terminal, so a new one is needed if the inferior terminal will be | |
782 | different from GDB's. | |
783 | ||
784 | Returns the session id of the new session, 0 if no session was created | |
785 | or -1 if an error occurred. */ | |
786 | pid_t | |
787 | create_tty_session (void) | |
788 | { | |
789 | #ifdef HAVE_SETSID | |
790 | pid_t ret; | |
791 | ||
792 | if (!job_control || inferior_thisrun_terminal == 0) | |
793 | return 0; | |
794 | ||
795 | ret = setsid (); | |
796 | if (ret == -1) | |
a73c6dcd | 797 | warning (_("Failed to create new terminal session: setsid: %s"), |
83116857 TJB |
798 | safe_strerror (errno)); |
799 | ||
800 | return ret; | |
801 | #else | |
802 | return 0; | |
803 | #endif /* HAVE_SETSID */ | |
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 | 820 | { |
11db9430 | 821 | add_info ("terminal", info_terminal_command, |
1bedd215 | 822 | _("Print inferior's saved terminal status.")); |
c906108c | 823 | |
c906108c SS |
824 | terminal_is_ours = 1; |
825 | ||
15652511 SDJ |
826 | /* OK, figure out whether we have job control. */ |
827 | have_job_control (); | |
7e1789f5 | 828 | |
7e1789f5 | 829 | observer_attach_inferior_exit (inflow_inferior_exit); |
6c95b8df PA |
830 | |
831 | inflow_inferior_data | |
8e260fc0 | 832 | = register_inferior_data_with_cleanup (NULL, inflow_inferior_data_cleanup); |
c906108c | 833 | } |