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 | extern void _initialize_inflow (void); |
392a587b | 46 | |
a14ed312 | 47 | static void pass_signal (int); |
c906108c | 48 | |
d6b64346 | 49 | static void child_terminal_ours_1 (int); |
c906108c SS |
50 | \f |
51 | /* Record terminal status separately for debugger and inferior. */ | |
52 | ||
819cc324 | 53 | static struct serial *stdin_serial; |
c906108c | 54 | |
7e1789f5 PA |
55 | /* Terminal related info we need to keep track of. Each inferior |
56 | holds an instance of this structure --- we save it whenever the | |
57 | corresponding inferior stops, and restore it to the foreground | |
58 | inferior when it resumes. */ | |
59 | struct terminal_info | |
60 | { | |
61 | /* The name of the tty (from the `tty' command) that we gave to the | |
62 | inferior when it was started. */ | |
191c4426 | 63 | char *run_terminal; |
7e1789f5 PA |
64 | |
65 | /* TTY state. We save it whenever the inferior stops, and restore | |
66 | it when it resumes. */ | |
67 | serial_ttystate ttystate; | |
68 | ||
69 | #ifdef PROCESS_GROUP_TYPE | |
70 | /* Process group. Saved and restored just like ttystate. */ | |
71 | PROCESS_GROUP_TYPE process_group; | |
72 | #endif | |
c906108c | 73 | |
7e1789f5 PA |
74 | /* fcntl flags. Saved and restored just like ttystate. */ |
75 | int tflags; | |
76 | }; | |
c906108c | 77 | |
7e1789f5 | 78 | /* Our own tty state, which we restore every time we need to deal with |
d9de1fe3 PA |
79 | the terminal. This is set once, when GDB first starts, and then |
80 | whenever we enter/leave TUI mode (gdb_save_tty_state). The | |
81 | settings of flags which readline saves and restores are | |
7e1789f5 PA |
82 | unimportant. */ |
83 | static struct terminal_info our_terminal_info; | |
c906108c | 84 | |
d9de1fe3 PA |
85 | /* Snapshot of the initial tty state taken during initialization of |
86 | GDB, before readline/ncurses have had a chance to change it. This | |
87 | is used as the initial tty state given to each new spawned | |
88 | inferior. Unlike our_terminal_info, this is only ever set | |
89 | once. */ | |
6a06d660 PP |
90 | static serial_ttystate initial_gdb_ttystate; |
91 | ||
6c95b8df PA |
92 | static struct terminal_info *get_inflow_inferior_data (struct inferior *); |
93 | ||
c906108c | 94 | #ifdef PROCESS_GROUP_TYPE |
7e1789f5 PA |
95 | |
96 | /* Return the process group of the current inferior. */ | |
97 | ||
98 | PROCESS_GROUP_TYPE | |
99 | inferior_process_group (void) | |
100 | { | |
6c95b8df | 101 | return get_inflow_inferior_data (current_inferior ())->process_group; |
7e1789f5 | 102 | } |
c906108c SS |
103 | #endif |
104 | ||
105 | /* While the inferior is running, we want SIGINT and SIGQUIT to go to the | |
106 | inferior only. If we have job control, that takes care of it. If not, | |
107 | we save our handlers in these two variables and set SIGINT and SIGQUIT | |
108 | to SIG_IGN. */ | |
109 | ||
a40805d4 PA |
110 | static sighandler_t sigint_ours; |
111 | static sighandler_t sigquit_ours; | |
c906108c | 112 | |
7e1789f5 PA |
113 | /* The name of the tty (from the `tty' command) that we're giving to |
114 | the inferior when starting it up. This is only (and should only | |
191c4426 PA |
115 | be) used as a transient global by new_tty_prefork, |
116 | create_tty_session, new_tty and new_tty_postfork, all called from | |
117 | fork_inferior, while forking a new child. */ | |
3cb3b8df | 118 | static const char *inferior_thisrun_terminal; |
c906108c SS |
119 | |
120 | /* Nonzero if our terminal settings are in effect. Zero if the | |
121 | inferior's settings are in effect. Ignored if !gdb_has_a_terminal | |
122 | (). */ | |
123 | ||
124 | int terminal_is_ours; | |
125 | ||
64a0ac84 PA |
126 | #ifdef PROCESS_GROUP_TYPE |
127 | static PROCESS_GROUP_TYPE | |
128 | gdb_getpgrp (void) | |
129 | { | |
130 | int process_group = -1; | |
abbb1732 | 131 | |
64a0ac84 PA |
132 | #ifdef HAVE_TERMIOS |
133 | process_group = tcgetpgrp (0); | |
134 | #endif | |
135 | #ifdef HAVE_TERMIO | |
136 | process_group = getpgrp (); | |
137 | #endif | |
138 | #ifdef HAVE_SGTTY | |
139 | ioctl (0, TIOCGPGRP, &process_group); | |
140 | #endif | |
141 | return process_group; | |
142 | } | |
143 | #endif | |
144 | ||
d9de1fe3 | 145 | /* See terminal.h. */ |
ea42d6f8 | 146 | |
6a06d660 PP |
147 | void |
148 | set_initial_gdb_ttystate (void) | |
149 | { | |
d9de1fe3 PA |
150 | /* Note we can't do any of this in _initialize_inflow because at |
151 | that point stdin_serial has not been created yet. */ | |
152 | ||
6a06d660 | 153 | initial_gdb_ttystate = serial_get_tty_state (stdin_serial); |
6a06d660 | 154 | |
d9de1fe3 | 155 | if (initial_gdb_ttystate != NULL) |
c906108c | 156 | { |
d9de1fe3 PA |
157 | our_terminal_info.ttystate |
158 | = serial_copy_tty_state (stdin_serial, initial_gdb_ttystate); | |
c906108c | 159 | #ifdef F_GETFL |
7e1789f5 | 160 | our_terminal_info.tflags = fcntl (0, F_GETFL, 0); |
c906108c | 161 | #endif |
807bddf3 | 162 | #ifdef PROCESS_GROUP_TYPE |
d9de1fe3 | 163 | our_terminal_info.process_group = gdb_getpgrp (); |
807bddf3 | 164 | #endif |
c906108c SS |
165 | } |
166 | } | |
167 | ||
d9de1fe3 PA |
168 | /* Does GDB have a terminal (on stdin)? */ |
169 | ||
170 | static int | |
171 | gdb_has_a_terminal (void) | |
172 | { | |
173 | return initial_gdb_ttystate != NULL; | |
174 | } | |
175 | ||
c906108c SS |
176 | /* Macro for printing errors from ioctl operations */ |
177 | ||
178 | #define OOPSY(what) \ | |
179 | if (result == -1) \ | |
180 | fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ | |
dc672865 | 181 | what, safe_strerror (errno)) |
c906108c | 182 | |
c906108c SS |
183 | /* Initialize the terminal settings we record for the inferior, |
184 | before we actually run the inferior. */ | |
185 | ||
186 | void | |
d6b64346 | 187 | child_terminal_init_with_pgrp (int pgrp) |
c906108c | 188 | { |
6f64ef53 PA |
189 | struct inferior *inf = current_inferior (); |
190 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); | |
191 | ||
192 | #ifdef PROCESS_GROUP_TYPE | |
193 | /* Store the process group even without a terminal as it is used not | |
194 | only to reset the tty foreground process group, but also to | |
195 | interrupt the inferior. */ | |
196 | tinfo->process_group = pgrp; | |
197 | #endif | |
198 | ||
c906108c SS |
199 | if (gdb_has_a_terminal ()) |
200 | { | |
6c95b8df | 201 | xfree (tinfo->ttystate); |
1e182ce8 | 202 | tinfo->ttystate = serial_copy_tty_state (stdin_serial, |
6a06d660 | 203 | initial_gdb_ttystate); |
c906108c | 204 | |
c906108c | 205 | /* Make sure that next time we call terminal_inferior (which will be |
c5aa993b JM |
206 | before the program runs, as it needs to be), we install the new |
207 | process group. */ | |
c906108c SS |
208 | terminal_is_ours = 1; |
209 | } | |
210 | } | |
211 | ||
a790ad35 SC |
212 | /* Save the terminal settings again. This is necessary for the TUI |
213 | when it switches to TUI or non-TUI mode; curses changes the terminal | |
214 | and gdb must be able to restore it correctly. */ | |
215 | ||
216 | void | |
3278a9f5 | 217 | gdb_save_tty_state (void) |
a790ad35 SC |
218 | { |
219 | if (gdb_has_a_terminal ()) | |
220 | { | |
7e1789f5 PA |
221 | xfree (our_terminal_info.ttystate); |
222 | our_terminal_info.ttystate = serial_get_tty_state (stdin_serial); | |
a790ad35 SC |
223 | } |
224 | } | |
225 | ||
c906108c | 226 | void |
d6b64346 | 227 | child_terminal_init (struct target_ops *self) |
c906108c SS |
228 | { |
229 | #ifdef PROCESS_GROUP_TYPE | |
d6b64346 PA |
230 | /* This is for Lynx, and should be cleaned up by having Lynx be a |
231 | separate debugging target with a version of target_terminal_init | |
232 | which passes in the process group to a generic routine which does | |
233 | all the work (and the non-threaded child_terminal_init can just | |
234 | pass in inferior_ptid to the same routine). */ | |
c906108c | 235 | /* We assume INFERIOR_PID is also the child's process group. */ |
d6b64346 | 236 | child_terminal_init_with_pgrp (ptid_get_pid (inferior_ptid)); |
c906108c SS |
237 | #endif /* PROCESS_GROUP_TYPE */ |
238 | } | |
239 | ||
240 | /* Put the inferior's terminal settings into effect. | |
4d4ca2a1 DE |
241 | This is preparation for starting or resuming the inferior. |
242 | ||
243 | N.B. Targets that want to use this with async support must build that | |
244 | support on top of this (e.g., the caller still needs to remove stdin | |
245 | from the event loop). E.g., see linux_nat_terminal_inferior. */ | |
c906108c SS |
246 | |
247 | void | |
d6b64346 | 248 | child_terminal_inferior (struct target_ops *self) |
c906108c | 249 | { |
7e1789f5 | 250 | struct inferior *inf; |
6c95b8df | 251 | struct terminal_info *tinfo; |
7e1789f5 PA |
252 | |
253 | if (!terminal_is_ours) | |
254 | return; | |
255 | ||
256 | inf = current_inferior (); | |
6c95b8df | 257 | tinfo = get_inflow_inferior_data (inf); |
7e1789f5 PA |
258 | |
259 | if (gdb_has_a_terminal () | |
6c95b8df PA |
260 | && tinfo->ttystate != NULL |
261 | && tinfo->run_terminal == NULL) | |
c906108c SS |
262 | { |
263 | int result; | |
264 | ||
265 | #ifdef F_GETFL | |
266 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
267 | places we use F_SETFL, so I'm inclined to think perhaps there |
268 | is some reason, however perverse. Perhaps not though... */ | |
6c95b8df PA |
269 | result = fcntl (0, F_SETFL, tinfo->tflags); |
270 | result = fcntl (0, F_SETFL, tinfo->tflags); | |
c906108c SS |
271 | OOPSY ("fcntl F_SETFL"); |
272 | #endif | |
273 | ||
274 | /* Because we were careful to not change in or out of raw mode in | |
c5aa993b JM |
275 | terminal_ours, we will not change in our out of raw mode with |
276 | this call, so we don't flush any input. */ | |
7e1789f5 | 277 | result = serial_set_tty_state (stdin_serial, |
6c95b8df | 278 | tinfo->ttystate); |
c906108c SS |
279 | OOPSY ("setting tty state"); |
280 | ||
281 | if (!job_control) | |
282 | { | |
a40805d4 | 283 | sigint_ours = signal (SIGINT, SIG_IGN); |
c906108c | 284 | #ifdef SIGQUIT |
a40805d4 | 285 | sigquit_ours = signal (SIGQUIT, SIG_IGN); |
c906108c SS |
286 | #endif |
287 | } | |
288 | ||
289 | /* If attach_flag is set, we don't know whether we are sharing a | |
c5aa993b JM |
290 | terminal with the inferior or not. (attaching a process |
291 | without a terminal is one case where we do not; attaching a | |
292 | process which we ran from the same shell as GDB via `&' is | |
293 | one case where we do, I think (but perhaps this is not | |
294 | `sharing' in the sense that we need to save and restore tty | |
295 | state)). I don't know if there is any way to tell whether we | |
296 | are sharing a terminal. So what we do is to go through all | |
297 | the saving and restoring of the tty state, but ignore errors | |
298 | setting the process group, which will happen if we are not | |
299 | sharing a terminal). */ | |
c906108c SS |
300 | |
301 | if (job_control) | |
302 | { | |
303 | #ifdef HAVE_TERMIOS | |
6c95b8df | 304 | result = tcsetpgrp (0, tinfo->process_group); |
181e7f93 | 305 | if (!inf->attach_flag) |
c906108c SS |
306 | OOPSY ("tcsetpgrp"); |
307 | #endif | |
308 | ||
309 | #ifdef HAVE_SGTTY | |
6c95b8df | 310 | result = ioctl (0, TIOCSPGRP, &tinfo->process_group); |
181e7f93 | 311 | if (!inf->attach_flag) |
c906108c SS |
312 | OOPSY ("TIOCSPGRP"); |
313 | #endif | |
314 | } | |
315 | ||
316 | } | |
317 | terminal_is_ours = 0; | |
318 | } | |
319 | ||
320 | /* Put some of our terminal settings into effect, | |
321 | enough to get proper results from our output, | |
322 | but do not change into or out of RAW mode | |
323 | so that no input is discarded. | |
324 | ||
325 | After doing this, either terminal_ours or terminal_inferior | |
4d4ca2a1 DE |
326 | should be called to get back to a normal state of affairs. |
327 | ||
328 | N.B. The implementation is (currently) no different than | |
329 | child_terminal_ours. See child_terminal_ours_1. */ | |
c906108c SS |
330 | |
331 | void | |
d6b64346 | 332 | child_terminal_ours_for_output (struct target_ops *self) |
c906108c | 333 | { |
d6b64346 | 334 | child_terminal_ours_1 (1); |
c906108c SS |
335 | } |
336 | ||
337 | /* Put our terminal settings into effect. | |
338 | First record the inferior's terminal settings | |
4d4ca2a1 DE |
339 | so they can be restored properly later. |
340 | ||
341 | N.B. Targets that want to use this with async support must build that | |
342 | support on top of this (e.g., the caller still needs to add stdin to the | |
343 | event loop). E.g., see linux_nat_terminal_ours. */ | |
c906108c SS |
344 | |
345 | void | |
d6b64346 | 346 | child_terminal_ours (struct target_ops *self) |
c906108c | 347 | { |
d6b64346 | 348 | child_terminal_ours_1 (0); |
c906108c SS |
349 | } |
350 | ||
351 | /* output_only is not used, and should not be used unless we introduce | |
352 | separate terminal_is_ours and terminal_is_ours_for_output | |
353 | flags. */ | |
354 | ||
355 | static void | |
d6b64346 | 356 | child_terminal_ours_1 (int output_only) |
c906108c | 357 | { |
7e1789f5 | 358 | struct inferior *inf; |
6c95b8df | 359 | struct terminal_info *tinfo; |
7e1789f5 PA |
360 | |
361 | if (terminal_is_ours) | |
362 | return; | |
363 | ||
d9d2d8b6 PA |
364 | terminal_is_ours = 1; |
365 | ||
7e1789f5 | 366 | /* Checking inferior->run_terminal is necessary so that |
c906108c SS |
367 | if GDB is running in the background, it won't block trying |
368 | to do the ioctl()'s below. Checking gdb_has_a_terminal | |
369 | avoids attempting all the ioctl's when running in batch. */ | |
7e1789f5 PA |
370 | |
371 | inf = current_inferior (); | |
6c95b8df | 372 | tinfo = get_inflow_inferior_data (inf); |
7e1789f5 | 373 | |
6c95b8df | 374 | if (tinfo->run_terminal != NULL || gdb_has_a_terminal () == 0) |
c906108c | 375 | return; |
a579cd9a | 376 | else |
c906108c | 377 | { |
4b69c284 | 378 | #ifdef SIGTTOU |
c906108c | 379 | /* Ignore this signal since it will happen when we try to set the |
c5aa993b | 380 | pgrp. */ |
a40805d4 | 381 | sighandler_t osigttou = NULL; |
4b69c284 | 382 | #endif |
821fc4ae | 383 | int result ATTRIBUTE_UNUSED; |
c906108c | 384 | |
c906108c SS |
385 | #ifdef SIGTTOU |
386 | if (job_control) | |
a40805d4 | 387 | osigttou = signal (SIGTTOU, SIG_IGN); |
c906108c SS |
388 | #endif |
389 | ||
6c95b8df PA |
390 | xfree (tinfo->ttystate); |
391 | tinfo->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. */ | |
6c95b8df | 398 | tinfo->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, | |
1777feb0 MS |
412 | though, since readline will deal with raw mode when/if it needs |
413 | to. */ | |
c906108c | 414 | |
7e1789f5 | 415 | serial_noflush_set_tty_state (stdin_serial, our_terminal_info.ttystate, |
6c95b8df | 416 | tinfo->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) | |
3e43a32a | 428 | fprintf_unfiltered (gdb_stderr, |
d6b64346 | 429 | "[tcsetpgrp failed in child_terminal_ours: %s]\n", |
dc672865 | 430 | safe_strerror (errno)); |
c906108c SS |
431 | #endif |
432 | #endif /* termios */ | |
433 | ||
434 | #ifdef HAVE_SGTTY | |
7e1789f5 | 435 | result = ioctl (0, TIOCSPGRP, &our_terminal_info.process_group); |
c906108c SS |
436 | #endif |
437 | } | |
438 | ||
439 | #ifdef SIGTTOU | |
440 | if (job_control) | |
441 | signal (SIGTTOU, osigttou); | |
442 | #endif | |
443 | ||
444 | if (!job_control) | |
445 | { | |
446 | signal (SIGINT, sigint_ours); | |
447 | #ifdef SIGQUIT | |
448 | signal (SIGQUIT, sigquit_ours); | |
449 | #endif | |
450 | } | |
451 | ||
452 | #ifdef F_GETFL | |
6c95b8df | 453 | tinfo->tflags = fcntl (0, F_GETFL, 0); |
c906108c SS |
454 | |
455 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
456 | places we use F_SETFL, so I'm inclined to think perhaps there |
457 | is some reason, however perverse. Perhaps not though... */ | |
7e1789f5 PA |
458 | result = fcntl (0, F_SETFL, our_terminal_info.tflags); |
459 | result = fcntl (0, F_SETFL, our_terminal_info.tflags); | |
c906108c | 460 | #endif |
c906108c SS |
461 | } |
462 | } | |
463 | ||
6c95b8df PA |
464 | /* Per-inferior data key. */ |
465 | static const struct inferior_data *inflow_inferior_data; | |
7e1789f5 PA |
466 | |
467 | static void | |
6c95b8df | 468 | inflow_inferior_data_cleanup (struct inferior *inf, void *arg) |
7e1789f5 | 469 | { |
9a3c8263 | 470 | struct terminal_info *info = (struct terminal_info *) arg; |
6c95b8df | 471 | |
487ad57c YQ |
472 | xfree (info->run_terminal); |
473 | xfree (info->ttystate); | |
474 | xfree (info); | |
6c95b8df PA |
475 | } |
476 | ||
477 | /* Get the current svr4 data. If none is found yet, add it now. This | |
478 | function always returns a valid object. */ | |
479 | ||
480 | static struct terminal_info * | |
481 | get_inflow_inferior_data (struct inferior *inf) | |
482 | { | |
483 | struct terminal_info *info; | |
484 | ||
9a3c8263 | 485 | info = (struct terminal_info *) inferior_data (inf, inflow_inferior_data); |
6c95b8df PA |
486 | if (info == NULL) |
487 | { | |
41bf6aca | 488 | info = XCNEW (struct terminal_info); |
6c95b8df PA |
489 | set_inferior_data (inf, inflow_inferior_data, info); |
490 | } | |
7e1789f5 | 491 | |
6c95b8df | 492 | return info; |
7e1789f5 PA |
493 | } |
494 | ||
495 | /* This is a "inferior_exit" observer. Releases the TERMINAL_INFO member | |
496 | of the inferior structure. This field is private to inflow.c, and | |
497 | its type is opaque to the rest of GDB. PID is the target pid of | |
498 | the inferior that is about to be removed from the inferior | |
499 | list. */ | |
500 | ||
501 | static void | |
a79b8f6e | 502 | inflow_inferior_exit (struct inferior *inf) |
7e1789f5 | 503 | { |
6c95b8df | 504 | struct terminal_info *info; |
7e1789f5 | 505 | |
9a3c8263 | 506 | info = (struct terminal_info *) inferior_data (inf, inflow_inferior_data); |
6c95b8df PA |
507 | if (info != NULL) |
508 | { | |
509 | xfree (info->run_terminal); | |
1e182ce8 | 510 | xfree (info->ttystate); |
6c95b8df PA |
511 | xfree (info); |
512 | set_inferior_data (inf, inflow_inferior_data, NULL); | |
513 | } | |
7e1789f5 PA |
514 | } |
515 | ||
191c4426 PA |
516 | void |
517 | copy_terminal_info (struct inferior *to, struct inferior *from) | |
518 | { | |
6c95b8df PA |
519 | struct terminal_info *tinfo_to, *tinfo_from; |
520 | ||
521 | tinfo_to = get_inflow_inferior_data (to); | |
522 | tinfo_from = get_inflow_inferior_data (from); | |
1e182ce8 UW |
523 | |
524 | xfree (tinfo_to->run_terminal); | |
525 | xfree (tinfo_to->ttystate); | |
526 | ||
6c95b8df | 527 | *tinfo_to = *tinfo_from; |
1e182ce8 | 528 | |
6c95b8df PA |
529 | if (tinfo_from->run_terminal) |
530 | tinfo_to->run_terminal | |
531 | = xstrdup (tinfo_from->run_terminal); | |
1e182ce8 UW |
532 | |
533 | if (tinfo_from->ttystate) | |
534 | tinfo_to->ttystate | |
535 | = serial_copy_tty_state (stdin_serial, tinfo_from->ttystate); | |
191c4426 PA |
536 | } |
537 | ||
c906108c | 538 | void |
fba45db2 | 539 | term_info (char *arg, int from_tty) |
c906108c SS |
540 | { |
541 | target_terminal_info (arg, from_tty); | |
542 | } | |
543 | ||
c906108c | 544 | void |
0a4f40a2 | 545 | child_terminal_info (struct target_ops *self, const char *args, int from_tty) |
c906108c | 546 | { |
7e1789f5 | 547 | struct inferior *inf; |
6c95b8df | 548 | struct terminal_info *tinfo; |
7e1789f5 | 549 | |
c906108c SS |
550 | if (!gdb_has_a_terminal ()) |
551 | { | |
a3f17187 | 552 | printf_filtered (_("This GDB does not control a terminal.\n")); |
c906108c SS |
553 | return; |
554 | } | |
555 | ||
7e1789f5 PA |
556 | if (ptid_equal (inferior_ptid, null_ptid)) |
557 | return; | |
558 | ||
559 | inf = current_inferior (); | |
6c95b8df | 560 | tinfo = get_inflow_inferior_data (inf); |
7e1789f5 | 561 | |
3e43a32a MS |
562 | printf_filtered (_("Inferior's terminal status " |
563 | "(currently saved by GDB):\n")); | |
c906108c SS |
564 | |
565 | /* First the fcntl flags. */ | |
566 | { | |
567 | int flags; | |
c5aa993b | 568 | |
6c95b8df | 569 | flags = tinfo->tflags; |
c906108c SS |
570 | |
571 | printf_filtered ("File descriptor flags = "); | |
572 | ||
573 | #ifndef O_ACCMODE | |
574 | #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) | |
575 | #endif | |
1777feb0 | 576 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug. */ |
c906108c SS |
577 | switch (flags & (O_ACCMODE)) |
578 | { | |
c5aa993b JM |
579 | case O_RDONLY: |
580 | printf_filtered ("O_RDONLY"); | |
581 | break; | |
582 | case O_WRONLY: | |
583 | printf_filtered ("O_WRONLY"); | |
584 | break; | |
585 | case O_RDWR: | |
586 | printf_filtered ("O_RDWR"); | |
587 | break; | |
c906108c SS |
588 | } |
589 | flags &= ~(O_ACCMODE); | |
590 | ||
591 | #ifdef O_NONBLOCK | |
c5aa993b | 592 | if (flags & O_NONBLOCK) |
c906108c SS |
593 | printf_filtered (" | O_NONBLOCK"); |
594 | flags &= ~O_NONBLOCK; | |
595 | #endif | |
c5aa993b | 596 | |
c906108c SS |
597 | #if defined (O_NDELAY) |
598 | /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will | |
599 | print it as O_NONBLOCK, which is good cause that is what POSIX | |
600 | has, and the flag will already be cleared by the time we get here. */ | |
601 | if (flags & O_NDELAY) | |
602 | printf_filtered (" | O_NDELAY"); | |
603 | flags &= ~O_NDELAY; | |
604 | #endif | |
605 | ||
606 | if (flags & O_APPEND) | |
607 | printf_filtered (" | O_APPEND"); | |
608 | flags &= ~O_APPEND; | |
609 | ||
610 | #if defined (O_BINARY) | |
611 | if (flags & O_BINARY) | |
612 | printf_filtered (" | O_BINARY"); | |
613 | flags &= ~O_BINARY; | |
614 | #endif | |
615 | ||
616 | if (flags) | |
617 | printf_filtered (" | 0x%x", flags); | |
618 | printf_filtered ("\n"); | |
619 | } | |
620 | ||
621 | #ifdef PROCESS_GROUP_TYPE | |
6c95b8df | 622 | printf_filtered ("Process group = %d\n", (int) tinfo->process_group); |
c906108c SS |
623 | #endif |
624 | ||
6c95b8df | 625 | serial_print_tty_state (stdin_serial, tinfo->ttystate, gdb_stdout); |
c906108c SS |
626 | } |
627 | \f | |
628 | /* NEW_TTY_PREFORK is called before forking a new child process, | |
629 | so we can record the state of ttys in the child to be formed. | |
630 | TTYNAME is null if we are to share the terminal with gdb; | |
631 | or points to a string containing the name of the desired tty. | |
632 | ||
633 | NEW_TTY is called in new child processes under Unix, which will | |
634 | become debugger target processes. This actually switches to | |
635 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
636 | ||
637 | void | |
3cb3b8df | 638 | new_tty_prefork (const char *ttyname) |
c906108c SS |
639 | { |
640 | /* Save the name for later, for determining whether we and the child | |
641 | are sharing a tty. */ | |
642 | inferior_thisrun_terminal = ttyname; | |
643 | } | |
644 | ||
e6d088ec | 645 | #if !defined(__GO32__) && !defined(_WIN32) |
bf1d7d9c JB |
646 | /* If RESULT, assumed to be the return value from a system call, is |
647 | negative, print the error message indicated by errno and exit. | |
648 | MSG should identify the operation that failed. */ | |
649 | static void | |
650 | check_syscall (const char *msg, int result) | |
651 | { | |
652 | if (result < 0) | |
653 | { | |
654 | print_sys_errmsg (msg, errno); | |
655 | _exit (1); | |
656 | } | |
657 | } | |
e6d088ec | 658 | #endif |
bf1d7d9c | 659 | |
c906108c | 660 | void |
fba45db2 | 661 | new_tty (void) |
c906108c | 662 | { |
52f0bd74 | 663 | int tty; |
c906108c SS |
664 | |
665 | if (inferior_thisrun_terminal == 0) | |
666 | return; | |
667 | #if !defined(__GO32__) && !defined(_WIN32) | |
668 | #ifdef TIOCNOTTY | |
669 | /* Disconnect the child process from our controlling terminal. On some | |
670 | systems (SVR4 for example), this may cause a SIGTTOU, so temporarily | |
1777feb0 | 671 | ignore SIGTTOU. */ |
c5aa993b | 672 | tty = open ("/dev/tty", O_RDWR); |
c906108c SS |
673 | if (tty > 0) |
674 | { | |
a40805d4 | 675 | sighandler_t osigttou; |
c906108c | 676 | |
a40805d4 | 677 | osigttou = signal (SIGTTOU, SIG_IGN); |
c5aa993b JM |
678 | ioctl (tty, TIOCNOTTY, 0); |
679 | close (tty); | |
680 | signal (SIGTTOU, osigttou); | |
c906108c SS |
681 | } |
682 | #endif | |
683 | ||
684 | /* Now open the specified new terminal. */ | |
c5aa993b | 685 | tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
bf1d7d9c | 686 | check_syscall (inferior_thisrun_terminal, tty); |
c906108c SS |
687 | |
688 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
689 | if (tty != 0) | |
c5aa993b JM |
690 | { |
691 | close (0); | |
bf1d7d9c | 692 | check_syscall ("dup'ing tty into fd 0", dup (tty)); |
c5aa993b | 693 | } |
c906108c | 694 | if (tty != 1) |
c5aa993b JM |
695 | { |
696 | close (1); | |
bf1d7d9c | 697 | check_syscall ("dup'ing tty into fd 1", dup (tty)); |
c5aa993b | 698 | } |
c906108c | 699 | if (tty != 2) |
c5aa993b JM |
700 | { |
701 | close (2); | |
bf1d7d9c | 702 | check_syscall ("dup'ing tty into fd 2", dup (tty)); |
c5aa993b | 703 | } |
83116857 TJB |
704 | |
705 | #ifdef TIOCSCTTY | |
706 | /* Make tty our new controlling terminal. */ | |
707 | if (ioctl (tty, TIOCSCTTY, 0) == -1) | |
708 | /* Mention GDB in warning because it will appear in the inferior's | |
709 | terminal instead of GDB's. */ | |
a73c6dcd | 710 | warning (_("GDB: Failed to set controlling terminal: %s"), |
83116857 TJB |
711 | safe_strerror (errno)); |
712 | #endif | |
713 | ||
c906108c | 714 | if (tty > 2) |
c5aa993b JM |
715 | close (tty); |
716 | #endif /* !go32 && !win32 */ | |
c906108c | 717 | } |
191c4426 PA |
718 | |
719 | /* NEW_TTY_POSTFORK is called after forking a new child process, and | |
720 | adding it to the inferior table, to store the TTYNAME being used by | |
721 | the child, or null if it sharing the terminal with gdb. */ | |
722 | ||
723 | void | |
724 | new_tty_postfork (void) | |
725 | { | |
726 | /* Save the name for later, for determining whether we and the child | |
727 | are sharing a tty. */ | |
728 | ||
729 | if (inferior_thisrun_terminal) | |
6c95b8df PA |
730 | { |
731 | struct inferior *inf = current_inferior (); | |
732 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); | |
733 | ||
734 | tinfo->run_terminal = xstrdup (inferior_thisrun_terminal); | |
735 | } | |
191c4426 PA |
736 | |
737 | inferior_thisrun_terminal = NULL; | |
738 | } | |
739 | ||
c906108c SS |
740 | \f |
741 | /* Call set_sigint_trap when you need to pass a signal on to an attached | |
1777feb0 | 742 | process when handling SIGINT. */ |
c906108c | 743 | |
c906108c | 744 | static void |
fba45db2 | 745 | pass_signal (int signo) |
c906108c SS |
746 | { |
747 | #ifndef _WIN32 | |
dfd4cc63 | 748 | kill (ptid_get_pid (inferior_ptid), SIGINT); |
c906108c SS |
749 | #endif |
750 | } | |
751 | ||
a40805d4 | 752 | static sighandler_t osig; |
7e1789f5 | 753 | static int osig_set; |
c906108c SS |
754 | |
755 | void | |
fba45db2 | 756 | set_sigint_trap (void) |
c906108c | 757 | { |
181e7f93 | 758 | struct inferior *inf = current_inferior (); |
6c95b8df PA |
759 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); |
760 | ||
761 | if (inf->attach_flag || tinfo->run_terminal) | |
c906108c | 762 | { |
a40805d4 | 763 | osig = signal (SIGINT, pass_signal); |
7e1789f5 | 764 | osig_set = 1; |
c906108c | 765 | } |
7e1789f5 PA |
766 | else |
767 | osig_set = 0; | |
c906108c SS |
768 | } |
769 | ||
770 | void | |
fba45db2 | 771 | clear_sigint_trap (void) |
c906108c | 772 | { |
7e1789f5 | 773 | if (osig_set) |
c906108c SS |
774 | { |
775 | signal (SIGINT, osig); | |
7e1789f5 | 776 | osig_set = 0; |
c906108c SS |
777 | } |
778 | } | |
779 | \f | |
c906108c | 780 | |
83116857 TJB |
781 | /* Create a new session if the inferior will run in a different tty. |
782 | A session is UNIX's way of grouping processes that share a controlling | |
783 | terminal, so a new one is needed if the inferior terminal will be | |
784 | different from GDB's. | |
785 | ||
786 | Returns the session id of the new session, 0 if no session was created | |
787 | or -1 if an error occurred. */ | |
788 | pid_t | |
789 | create_tty_session (void) | |
790 | { | |
791 | #ifdef HAVE_SETSID | |
792 | pid_t ret; | |
793 | ||
794 | if (!job_control || inferior_thisrun_terminal == 0) | |
795 | return 0; | |
796 | ||
797 | ret = setsid (); | |
798 | if (ret == -1) | |
a73c6dcd | 799 | warning (_("Failed to create new terminal session: setsid: %s"), |
83116857 TJB |
800 | safe_strerror (errno)); |
801 | ||
802 | return ret; | |
803 | #else | |
804 | return 0; | |
805 | #endif /* HAVE_SETSID */ | |
806 | } | |
807 | ||
0ea3f30e DJ |
808 | /* Get all the current tty settings (including whether we have a |
809 | tty at all!). We can't do this in _initialize_inflow because | |
810 | serial_fdopen() won't work until the serial_ops_list is | |
811 | initialized, but we don't want to do it lazily either, so | |
812 | that we can guarantee stdin_serial is opened if there is | |
813 | a terminal. */ | |
814 | void | |
815 | initialize_stdin_serial (void) | |
816 | { | |
817 | stdin_serial = serial_fdopen (0); | |
818 | } | |
819 | ||
c906108c | 820 | void |
fba45db2 | 821 | _initialize_inflow (void) |
c906108c SS |
822 | { |
823 | add_info ("terminal", term_info, | |
1bedd215 | 824 | _("Print inferior's saved terminal status.")); |
c906108c | 825 | |
c906108c SS |
826 | terminal_is_ours = 1; |
827 | ||
15652511 SDJ |
828 | /* OK, figure out whether we have job control. */ |
829 | have_job_control (); | |
7e1789f5 | 830 | |
7e1789f5 | 831 | observer_attach_inferior_exit (inflow_inferior_exit); |
6c95b8df PA |
832 | |
833 | inflow_inferior_data | |
8e260fc0 | 834 | = register_inferior_data_with_cleanup (NULL, inflow_inferior_data_cleanup); |
c906108c | 835 | } |