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" |
726e1356 PA |
34 | #ifdef HAVE_TERMIOS_H |
35 | #include <termios.h> | |
36 | #endif | |
15652511 | 37 | #include "job-control.h" |
c906108c | 38 | |
c2d11a7d JM |
39 | #ifdef HAVE_SYS_IOCTL_H |
40 | #include <sys/ioctl.h> | |
41 | #endif | |
42 | ||
f2acbe1c MK |
43 | #ifndef O_NOCTTY |
44 | #define O_NOCTTY 0 | |
45 | #endif | |
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 | ||
726e1356 | 69 | #ifdef HAVE_TERMIOS_H |
7e1789f5 | 70 | /* Process group. Saved and restored just like ttystate. */ |
726e1356 | 71 | pid_t process_group; |
7e1789f5 | 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 | ||
e2c33ac7 PA |
94 | /* RAII class used to ignore SIGTTOU in a scope. */ |
95 | ||
96 | class scoped_ignore_sigttou | |
97 | { | |
98 | public: | |
99 | scoped_ignore_sigttou () | |
100 | { | |
101 | #ifdef SIGTTOU | |
102 | if (job_control) | |
103 | m_osigttou = signal (SIGTTOU, SIG_IGN); | |
104 | #endif | |
105 | } | |
106 | ||
107 | ~scoped_ignore_sigttou () | |
108 | { | |
109 | #ifdef SIGTTOU | |
110 | if (job_control) | |
111 | signal (SIGTTOU, m_osigttou); | |
112 | #endif | |
113 | } | |
114 | ||
115 | DISABLE_COPY_AND_ASSIGN (scoped_ignore_sigttou); | |
116 | ||
117 | private: | |
118 | #ifdef SIGTTOU | |
119 | sighandler_t m_osigttou = NULL; | |
120 | #endif | |
121 | }; | |
122 | ||
726e1356 | 123 | #ifdef HAVE_TERMIOS_H |
7e1789f5 PA |
124 | |
125 | /* Return the process group of the current inferior. */ | |
126 | ||
726e1356 | 127 | pid_t |
7e1789f5 PA |
128 | inferior_process_group (void) |
129 | { | |
6c95b8df | 130 | return get_inflow_inferior_data (current_inferior ())->process_group; |
7e1789f5 | 131 | } |
c906108c SS |
132 | #endif |
133 | ||
134 | /* While the inferior is running, we want SIGINT and SIGQUIT to go to the | |
135 | inferior only. If we have job control, that takes care of it. If not, | |
136 | we save our handlers in these two variables and set SIGINT and SIGQUIT | |
137 | to SIG_IGN. */ | |
138 | ||
a40805d4 PA |
139 | static sighandler_t sigint_ours; |
140 | static sighandler_t sigquit_ours; | |
c906108c | 141 | |
7e1789f5 PA |
142 | /* The name of the tty (from the `tty' command) that we're giving to |
143 | the inferior when starting it up. This is only (and should only | |
191c4426 PA |
144 | be) used as a transient global by new_tty_prefork, |
145 | create_tty_session, new_tty and new_tty_postfork, all called from | |
146 | fork_inferior, while forking a new child. */ | |
3cb3b8df | 147 | static const char *inferior_thisrun_terminal; |
c906108c SS |
148 | |
149 | /* Nonzero if our terminal settings are in effect. Zero if the | |
150 | inferior's settings are in effect. Ignored if !gdb_has_a_terminal | |
151 | (). */ | |
152 | ||
153 | int terminal_is_ours; | |
154 | ||
d9de1fe3 | 155 | /* See terminal.h. */ |
ea42d6f8 | 156 | |
6a06d660 PP |
157 | void |
158 | set_initial_gdb_ttystate (void) | |
159 | { | |
d9de1fe3 PA |
160 | /* Note we can't do any of this in _initialize_inflow because at |
161 | that point stdin_serial has not been created yet. */ | |
162 | ||
6a06d660 | 163 | initial_gdb_ttystate = serial_get_tty_state (stdin_serial); |
6a06d660 | 164 | |
d9de1fe3 | 165 | if (initial_gdb_ttystate != NULL) |
c906108c | 166 | { |
d9de1fe3 PA |
167 | our_terminal_info.ttystate |
168 | = serial_copy_tty_state (stdin_serial, initial_gdb_ttystate); | |
c906108c | 169 | #ifdef F_GETFL |
7e1789f5 | 170 | our_terminal_info.tflags = fcntl (0, F_GETFL, 0); |
c906108c | 171 | #endif |
726e1356 PA |
172 | #ifdef HAVE_TERMIOS_H |
173 | our_terminal_info.process_group = tcgetpgrp (0); | |
807bddf3 | 174 | #endif |
c906108c SS |
175 | } |
176 | } | |
177 | ||
d9de1fe3 PA |
178 | /* Does GDB have a terminal (on stdin)? */ |
179 | ||
180 | static int | |
181 | gdb_has_a_terminal (void) | |
182 | { | |
183 | return initial_gdb_ttystate != NULL; | |
184 | } | |
185 | ||
c906108c SS |
186 | /* Macro for printing errors from ioctl operations */ |
187 | ||
188 | #define OOPSY(what) \ | |
189 | if (result == -1) \ | |
190 | fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ | |
dc672865 | 191 | what, safe_strerror (errno)) |
c906108c | 192 | |
c906108c SS |
193 | /* Initialize the terminal settings we record for the inferior, |
194 | before we actually run the inferior. */ | |
195 | ||
196 | void | |
556e5da5 | 197 | child_terminal_init (struct target_ops *self) |
c906108c | 198 | { |
6f64ef53 PA |
199 | struct inferior *inf = current_inferior (); |
200 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); | |
201 | ||
726e1356 | 202 | #ifdef HAVE_TERMIOS_H |
6f64ef53 PA |
203 | /* Store the process group even without a terminal as it is used not |
204 | only to reset the tty foreground process group, but also to | |
556e5da5 PA |
205 | interrupt the inferior. A child we spawn should be a process |
206 | group leader (PGID==PID) at this point, though that may not be | |
207 | true if we're attaching to an existing process. */ | |
208 | tinfo->process_group = inf->pid; | |
6f64ef53 PA |
209 | #endif |
210 | ||
c906108c SS |
211 | if (gdb_has_a_terminal ()) |
212 | { | |
6c95b8df | 213 | xfree (tinfo->ttystate); |
1e182ce8 | 214 | tinfo->ttystate = serial_copy_tty_state (stdin_serial, |
6a06d660 | 215 | initial_gdb_ttystate); |
c906108c | 216 | |
c906108c | 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 | |
3278a9f5 | 229 | gdb_save_tty_state (void) |
a790ad35 SC |
230 | { |
231 | if (gdb_has_a_terminal ()) | |
232 | { | |
7e1789f5 PA |
233 | xfree (our_terminal_info.ttystate); |
234 | our_terminal_info.ttystate = serial_get_tty_state (stdin_serial); | |
a790ad35 SC |
235 | } |
236 | } | |
237 | ||
c906108c | 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 | |
6c95b8df | 264 | result = fcntl (0, F_SETFL, tinfo->tflags); |
c906108c SS |
265 | OOPSY ("fcntl F_SETFL"); |
266 | #endif | |
267 | ||
726e1356 | 268 | result = serial_set_tty_state (stdin_serial, tinfo->ttystate); |
c906108c SS |
269 | OOPSY ("setting tty state"); |
270 | ||
271 | if (!job_control) | |
272 | { | |
a40805d4 | 273 | sigint_ours = signal (SIGINT, SIG_IGN); |
c906108c | 274 | #ifdef SIGQUIT |
a40805d4 | 275 | sigquit_ours = signal (SIGQUIT, SIG_IGN); |
c906108c SS |
276 | #endif |
277 | } | |
278 | ||
279 | /* If attach_flag is set, we don't know whether we are sharing a | |
c5aa993b JM |
280 | terminal with the inferior or not. (attaching a process |
281 | without a terminal is one case where we do not; attaching a | |
282 | process which we ran from the same shell as GDB via `&' is | |
283 | one case where we do, I think (but perhaps this is not | |
284 | `sharing' in the sense that we need to save and restore tty | |
285 | state)). I don't know if there is any way to tell whether we | |
286 | are sharing a terminal. So what we do is to go through all | |
287 | the saving and restoring of the tty state, but ignore errors | |
288 | setting the process group, which will happen if we are not | |
289 | sharing a terminal). */ | |
c906108c SS |
290 | |
291 | if (job_control) | |
292 | { | |
726e1356 | 293 | #ifdef HAVE_TERMIOS_H |
6c95b8df | 294 | result = tcsetpgrp (0, tinfo->process_group); |
181e7f93 | 295 | if (!inf->attach_flag) |
c906108c SS |
296 | OOPSY ("tcsetpgrp"); |
297 | #endif | |
c906108c | 298 | } |
c906108c SS |
299 | } |
300 | terminal_is_ours = 0; | |
301 | } | |
302 | ||
303 | /* Put some of our terminal settings into effect, | |
304 | enough to get proper results from our output, | |
305 | but do not change into or out of RAW mode | |
306 | so that no input is discarded. | |
307 | ||
308 | After doing this, either terminal_ours or terminal_inferior | |
4d4ca2a1 DE |
309 | should be called to get back to a normal state of affairs. |
310 | ||
311 | N.B. The implementation is (currently) no different than | |
312 | child_terminal_ours. See child_terminal_ours_1. */ | |
c906108c SS |
313 | |
314 | void | |
d6b64346 | 315 | child_terminal_ours_for_output (struct target_ops *self) |
c906108c | 316 | { |
d6b64346 | 317 | child_terminal_ours_1 (1); |
c906108c SS |
318 | } |
319 | ||
320 | /* Put our terminal settings into effect. | |
321 | First record the inferior's terminal settings | |
4d4ca2a1 DE |
322 | so they can be restored properly later. |
323 | ||
324 | N.B. Targets that want to use this with async support must build that | |
325 | support on top of this (e.g., the caller still needs to add stdin to the | |
326 | event loop). E.g., see linux_nat_terminal_ours. */ | |
c906108c SS |
327 | |
328 | void | |
d6b64346 | 329 | child_terminal_ours (struct target_ops *self) |
c906108c | 330 | { |
d6b64346 | 331 | child_terminal_ours_1 (0); |
c906108c SS |
332 | } |
333 | ||
334 | /* output_only is not used, and should not be used unless we introduce | |
335 | separate terminal_is_ours and terminal_is_ours_for_output | |
336 | flags. */ | |
337 | ||
338 | static void | |
d6b64346 | 339 | child_terminal_ours_1 (int output_only) |
c906108c | 340 | { |
7e1789f5 | 341 | struct inferior *inf; |
6c95b8df | 342 | struct terminal_info *tinfo; |
7e1789f5 PA |
343 | |
344 | if (terminal_is_ours) | |
345 | return; | |
346 | ||
d9d2d8b6 PA |
347 | terminal_is_ours = 1; |
348 | ||
7e1789f5 | 349 | /* Checking inferior->run_terminal is necessary so that |
c906108c SS |
350 | if GDB is running in the background, it won't block trying |
351 | to do the ioctl()'s below. Checking gdb_has_a_terminal | |
352 | avoids attempting all the ioctl's when running in batch. */ | |
7e1789f5 PA |
353 | |
354 | inf = current_inferior (); | |
6c95b8df | 355 | tinfo = get_inflow_inferior_data (inf); |
7e1789f5 | 356 | |
6c95b8df | 357 | if (tinfo->run_terminal != NULL || gdb_has_a_terminal () == 0) |
c906108c | 358 | return; |
a579cd9a | 359 | else |
c906108c | 360 | { |
821fc4ae | 361 | int result ATTRIBUTE_UNUSED; |
c906108c | 362 | |
e2c33ac7 PA |
363 | /* Ignore SIGTTOU since it will happen when we try to set the |
364 | terminal's pgrp. */ | |
365 | scoped_ignore_sigttou ignore_sigttou; | |
c906108c | 366 | |
6c95b8df PA |
367 | xfree (tinfo->ttystate); |
368 | tinfo->ttystate = serial_get_tty_state (stdin_serial); | |
64a0ac84 | 369 | |
726e1356 | 370 | #ifdef HAVE_TERMIOS_H |
181e7f93 | 371 | if (!inf->attach_flag) |
726e1356 | 372 | /* If tcsetpgrp failed in terminal_inferior, this would give us |
64a0ac84 PA |
373 | our process group instead of the inferior's. See |
374 | terminal_inferior for details. */ | |
726e1356 | 375 | tinfo->process_group = tcgetpgrp (0); |
49a834f9 | 376 | #endif |
c906108c | 377 | |
726e1356 PA |
378 | /* Set tty state to our_ttystate. */ |
379 | serial_set_tty_state (stdin_serial, our_terminal_info.ttystate); | |
c906108c SS |
380 | |
381 | if (job_control) | |
382 | { | |
726e1356 | 383 | #ifdef HAVE_TERMIOS_H |
7e1789f5 | 384 | result = tcsetpgrp (0, our_terminal_info.process_group); |
c906108c SS |
385 | #if 0 |
386 | /* This fails on Ultrix with EINVAL if you run the testsuite | |
387 | in the background with nohup, and then log out. GDB never | |
388 | used to check for an error here, so perhaps there are other | |
389 | such situations as well. */ | |
390 | if (result == -1) | |
3e43a32a | 391 | fprintf_unfiltered (gdb_stderr, |
d6b64346 | 392 | "[tcsetpgrp failed in child_terminal_ours: %s]\n", |
dc672865 | 393 | safe_strerror (errno)); |
c906108c SS |
394 | #endif |
395 | #endif /* termios */ | |
c906108c SS |
396 | } |
397 | ||
c906108c SS |
398 | if (!job_control) |
399 | { | |
400 | signal (SIGINT, sigint_ours); | |
401 | #ifdef SIGQUIT | |
402 | signal (SIGQUIT, sigquit_ours); | |
403 | #endif | |
404 | } | |
405 | ||
406 | #ifdef F_GETFL | |
6c95b8df | 407 | tinfo->tflags = fcntl (0, F_GETFL, 0); |
7e1789f5 | 408 | result = fcntl (0, F_SETFL, our_terminal_info.tflags); |
c906108c | 409 | #endif |
c906108c SS |
410 | } |
411 | } | |
412 | ||
6c95b8df PA |
413 | /* Per-inferior data key. */ |
414 | static const struct inferior_data *inflow_inferior_data; | |
7e1789f5 PA |
415 | |
416 | static void | |
6c95b8df | 417 | inflow_inferior_data_cleanup (struct inferior *inf, void *arg) |
7e1789f5 | 418 | { |
9a3c8263 | 419 | struct terminal_info *info = (struct terminal_info *) arg; |
6c95b8df | 420 | |
487ad57c YQ |
421 | xfree (info->run_terminal); |
422 | xfree (info->ttystate); | |
423 | xfree (info); | |
6c95b8df PA |
424 | } |
425 | ||
426 | /* Get the current svr4 data. If none is found yet, add it now. This | |
427 | function always returns a valid object. */ | |
428 | ||
429 | static struct terminal_info * | |
430 | get_inflow_inferior_data (struct inferior *inf) | |
431 | { | |
432 | struct terminal_info *info; | |
433 | ||
9a3c8263 | 434 | info = (struct terminal_info *) inferior_data (inf, inflow_inferior_data); |
6c95b8df PA |
435 | if (info == NULL) |
436 | { | |
41bf6aca | 437 | info = XCNEW (struct terminal_info); |
6c95b8df PA |
438 | set_inferior_data (inf, inflow_inferior_data, info); |
439 | } | |
7e1789f5 | 440 | |
6c95b8df | 441 | return info; |
7e1789f5 PA |
442 | } |
443 | ||
444 | /* This is a "inferior_exit" observer. Releases the TERMINAL_INFO member | |
445 | of the inferior structure. This field is private to inflow.c, and | |
446 | its type is opaque to the rest of GDB. PID is the target pid of | |
447 | the inferior that is about to be removed from the inferior | |
448 | list. */ | |
449 | ||
450 | static void | |
a79b8f6e | 451 | inflow_inferior_exit (struct inferior *inf) |
7e1789f5 | 452 | { |
6c95b8df | 453 | struct terminal_info *info; |
7e1789f5 | 454 | |
9a3c8263 | 455 | info = (struct terminal_info *) inferior_data (inf, inflow_inferior_data); |
6c95b8df PA |
456 | if (info != NULL) |
457 | { | |
458 | xfree (info->run_terminal); | |
1e182ce8 | 459 | xfree (info->ttystate); |
6c95b8df PA |
460 | xfree (info); |
461 | set_inferior_data (inf, inflow_inferior_data, NULL); | |
462 | } | |
7e1789f5 PA |
463 | } |
464 | ||
191c4426 PA |
465 | void |
466 | copy_terminal_info (struct inferior *to, struct inferior *from) | |
467 | { | |
6c95b8df PA |
468 | struct terminal_info *tinfo_to, *tinfo_from; |
469 | ||
470 | tinfo_to = get_inflow_inferior_data (to); | |
471 | tinfo_from = get_inflow_inferior_data (from); | |
1e182ce8 UW |
472 | |
473 | xfree (tinfo_to->run_terminal); | |
474 | xfree (tinfo_to->ttystate); | |
475 | ||
6c95b8df | 476 | *tinfo_to = *tinfo_from; |
1e182ce8 | 477 | |
6c95b8df PA |
478 | if (tinfo_from->run_terminal) |
479 | tinfo_to->run_terminal | |
480 | = xstrdup (tinfo_from->run_terminal); | |
1e182ce8 UW |
481 | |
482 | if (tinfo_from->ttystate) | |
483 | tinfo_to->ttystate | |
484 | = serial_copy_tty_state (stdin_serial, tinfo_from->ttystate); | |
191c4426 PA |
485 | } |
486 | ||
c906108c | 487 | void |
1d12d88f | 488 | info_terminal_command (const char *arg, int from_tty) |
c906108c | 489 | { |
223ffa71 | 490 | target_terminal::info (arg, from_tty); |
c906108c SS |
491 | } |
492 | ||
c906108c | 493 | void |
0a4f40a2 | 494 | child_terminal_info (struct target_ops *self, const char *args, int from_tty) |
c906108c | 495 | { |
7e1789f5 | 496 | struct inferior *inf; |
6c95b8df | 497 | struct terminal_info *tinfo; |
7e1789f5 | 498 | |
c906108c SS |
499 | if (!gdb_has_a_terminal ()) |
500 | { | |
a3f17187 | 501 | printf_filtered (_("This GDB does not control a terminal.\n")); |
c906108c SS |
502 | return; |
503 | } | |
504 | ||
7e1789f5 PA |
505 | if (ptid_equal (inferior_ptid, null_ptid)) |
506 | return; | |
507 | ||
508 | inf = current_inferior (); | |
6c95b8df | 509 | tinfo = get_inflow_inferior_data (inf); |
7e1789f5 | 510 | |
3e43a32a MS |
511 | printf_filtered (_("Inferior's terminal status " |
512 | "(currently saved by GDB):\n")); | |
c906108c SS |
513 | |
514 | /* First the fcntl flags. */ | |
515 | { | |
516 | int flags; | |
c5aa993b | 517 | |
6c95b8df | 518 | flags = tinfo->tflags; |
c906108c SS |
519 | |
520 | printf_filtered ("File descriptor flags = "); | |
521 | ||
522 | #ifndef O_ACCMODE | |
523 | #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) | |
524 | #endif | |
1777feb0 | 525 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug. */ |
c906108c SS |
526 | switch (flags & (O_ACCMODE)) |
527 | { | |
c5aa993b JM |
528 | case O_RDONLY: |
529 | printf_filtered ("O_RDONLY"); | |
530 | break; | |
531 | case O_WRONLY: | |
532 | printf_filtered ("O_WRONLY"); | |
533 | break; | |
534 | case O_RDWR: | |
535 | printf_filtered ("O_RDWR"); | |
536 | break; | |
c906108c SS |
537 | } |
538 | flags &= ~(O_ACCMODE); | |
539 | ||
540 | #ifdef O_NONBLOCK | |
c5aa993b | 541 | if (flags & O_NONBLOCK) |
c906108c SS |
542 | printf_filtered (" | O_NONBLOCK"); |
543 | flags &= ~O_NONBLOCK; | |
544 | #endif | |
c5aa993b | 545 | |
c906108c SS |
546 | #if defined (O_NDELAY) |
547 | /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will | |
548 | print it as O_NONBLOCK, which is good cause that is what POSIX | |
549 | has, and the flag will already be cleared by the time we get here. */ | |
550 | if (flags & O_NDELAY) | |
551 | printf_filtered (" | O_NDELAY"); | |
552 | flags &= ~O_NDELAY; | |
553 | #endif | |
554 | ||
555 | if (flags & O_APPEND) | |
556 | printf_filtered (" | O_APPEND"); | |
557 | flags &= ~O_APPEND; | |
558 | ||
559 | #if defined (O_BINARY) | |
560 | if (flags & O_BINARY) | |
561 | printf_filtered (" | O_BINARY"); | |
562 | flags &= ~O_BINARY; | |
563 | #endif | |
564 | ||
565 | if (flags) | |
566 | printf_filtered (" | 0x%x", flags); | |
567 | printf_filtered ("\n"); | |
568 | } | |
569 | ||
726e1356 | 570 | #ifdef HAVE_TERMIOS_H |
6c95b8df | 571 | printf_filtered ("Process group = %d\n", (int) tinfo->process_group); |
c906108c SS |
572 | #endif |
573 | ||
6c95b8df | 574 | serial_print_tty_state (stdin_serial, tinfo->ttystate, gdb_stdout); |
c906108c SS |
575 | } |
576 | \f | |
577 | /* NEW_TTY_PREFORK is called before forking a new child process, | |
578 | so we can record the state of ttys in the child to be formed. | |
579 | TTYNAME is null if we are to share the terminal with gdb; | |
580 | or points to a string containing the name of the desired tty. | |
581 | ||
582 | NEW_TTY is called in new child processes under Unix, which will | |
583 | become debugger target processes. This actually switches to | |
584 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
585 | ||
586 | void | |
3cb3b8df | 587 | new_tty_prefork (const char *ttyname) |
c906108c SS |
588 | { |
589 | /* Save the name for later, for determining whether we and the child | |
590 | are sharing a tty. */ | |
591 | inferior_thisrun_terminal = ttyname; | |
592 | } | |
593 | ||
e6d088ec | 594 | #if !defined(__GO32__) && !defined(_WIN32) |
bf1d7d9c JB |
595 | /* If RESULT, assumed to be the return value from a system call, is |
596 | negative, print the error message indicated by errno and exit. | |
597 | MSG should identify the operation that failed. */ | |
598 | static void | |
599 | check_syscall (const char *msg, int result) | |
600 | { | |
601 | if (result < 0) | |
602 | { | |
603 | print_sys_errmsg (msg, errno); | |
604 | _exit (1); | |
605 | } | |
606 | } | |
e6d088ec | 607 | #endif |
bf1d7d9c | 608 | |
c906108c | 609 | void |
fba45db2 | 610 | new_tty (void) |
c906108c | 611 | { |
52f0bd74 | 612 | int tty; |
c906108c SS |
613 | |
614 | if (inferior_thisrun_terminal == 0) | |
615 | return; | |
616 | #if !defined(__GO32__) && !defined(_WIN32) | |
617 | #ifdef TIOCNOTTY | |
618 | /* Disconnect the child process from our controlling terminal. On some | |
619 | systems (SVR4 for example), this may cause a SIGTTOU, so temporarily | |
1777feb0 | 620 | ignore SIGTTOU. */ |
c5aa993b | 621 | tty = open ("/dev/tty", O_RDWR); |
c906108c SS |
622 | if (tty > 0) |
623 | { | |
e2c33ac7 | 624 | scoped_ignore_sigttou ignore_sigttou; |
c906108c | 625 | |
c5aa993b JM |
626 | ioctl (tty, TIOCNOTTY, 0); |
627 | close (tty); | |
c906108c SS |
628 | } |
629 | #endif | |
630 | ||
631 | /* Now open the specified new terminal. */ | |
c5aa993b | 632 | tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
bf1d7d9c | 633 | check_syscall (inferior_thisrun_terminal, tty); |
c906108c SS |
634 | |
635 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
636 | if (tty != 0) | |
c5aa993b JM |
637 | { |
638 | close (0); | |
bf1d7d9c | 639 | check_syscall ("dup'ing tty into fd 0", dup (tty)); |
c5aa993b | 640 | } |
c906108c | 641 | if (tty != 1) |
c5aa993b JM |
642 | { |
643 | close (1); | |
bf1d7d9c | 644 | check_syscall ("dup'ing tty into fd 1", dup (tty)); |
c5aa993b | 645 | } |
c906108c | 646 | if (tty != 2) |
c5aa993b JM |
647 | { |
648 | close (2); | |
bf1d7d9c | 649 | check_syscall ("dup'ing tty into fd 2", dup (tty)); |
c5aa993b | 650 | } |
83116857 TJB |
651 | |
652 | #ifdef TIOCSCTTY | |
653 | /* Make tty our new controlling terminal. */ | |
654 | if (ioctl (tty, TIOCSCTTY, 0) == -1) | |
655 | /* Mention GDB in warning because it will appear in the inferior's | |
656 | terminal instead of GDB's. */ | |
a73c6dcd | 657 | warning (_("GDB: Failed to set controlling terminal: %s"), |
83116857 TJB |
658 | safe_strerror (errno)); |
659 | #endif | |
660 | ||
c906108c | 661 | if (tty > 2) |
c5aa993b JM |
662 | close (tty); |
663 | #endif /* !go32 && !win32 */ | |
c906108c | 664 | } |
191c4426 PA |
665 | |
666 | /* NEW_TTY_POSTFORK is called after forking a new child process, and | |
667 | adding it to the inferior table, to store the TTYNAME being used by | |
668 | the child, or null if it sharing the terminal with gdb. */ | |
669 | ||
670 | void | |
671 | new_tty_postfork (void) | |
672 | { | |
673 | /* Save the name for later, for determining whether we and the child | |
674 | are sharing a tty. */ | |
675 | ||
676 | if (inferior_thisrun_terminal) | |
6c95b8df PA |
677 | { |
678 | struct inferior *inf = current_inferior (); | |
679 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); | |
680 | ||
681 | tinfo->run_terminal = xstrdup (inferior_thisrun_terminal); | |
682 | } | |
191c4426 PA |
683 | |
684 | inferior_thisrun_terminal = NULL; | |
685 | } | |
686 | ||
c906108c SS |
687 | \f |
688 | /* Call set_sigint_trap when you need to pass a signal on to an attached | |
1777feb0 | 689 | process when handling SIGINT. */ |
c906108c | 690 | |
c906108c | 691 | static void |
fba45db2 | 692 | pass_signal (int signo) |
c906108c SS |
693 | { |
694 | #ifndef _WIN32 | |
dfd4cc63 | 695 | kill (ptid_get_pid (inferior_ptid), SIGINT); |
c906108c SS |
696 | #endif |
697 | } | |
698 | ||
a40805d4 | 699 | static sighandler_t osig; |
7e1789f5 | 700 | static int osig_set; |
c906108c SS |
701 | |
702 | void | |
fba45db2 | 703 | set_sigint_trap (void) |
c906108c | 704 | { |
181e7f93 | 705 | struct inferior *inf = current_inferior (); |
6c95b8df PA |
706 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); |
707 | ||
708 | if (inf->attach_flag || tinfo->run_terminal) | |
c906108c | 709 | { |
a40805d4 | 710 | osig = signal (SIGINT, pass_signal); |
7e1789f5 | 711 | osig_set = 1; |
c906108c | 712 | } |
7e1789f5 PA |
713 | else |
714 | osig_set = 0; | |
c906108c SS |
715 | } |
716 | ||
717 | void | |
fba45db2 | 718 | clear_sigint_trap (void) |
c906108c | 719 | { |
7e1789f5 | 720 | if (osig_set) |
c906108c SS |
721 | { |
722 | signal (SIGINT, osig); | |
7e1789f5 | 723 | osig_set = 0; |
c906108c SS |
724 | } |
725 | } | |
726 | \f | |
c906108c | 727 | |
83116857 TJB |
728 | /* Create a new session if the inferior will run in a different tty. |
729 | A session is UNIX's way of grouping processes that share a controlling | |
730 | terminal, so a new one is needed if the inferior terminal will be | |
731 | different from GDB's. | |
732 | ||
733 | Returns the session id of the new session, 0 if no session was created | |
734 | or -1 if an error occurred. */ | |
735 | pid_t | |
736 | create_tty_session (void) | |
737 | { | |
738 | #ifdef HAVE_SETSID | |
739 | pid_t ret; | |
740 | ||
741 | if (!job_control || inferior_thisrun_terminal == 0) | |
742 | return 0; | |
743 | ||
744 | ret = setsid (); | |
745 | if (ret == -1) | |
a73c6dcd | 746 | warning (_("Failed to create new terminal session: setsid: %s"), |
83116857 TJB |
747 | safe_strerror (errno)); |
748 | ||
749 | return ret; | |
750 | #else | |
751 | return 0; | |
752 | #endif /* HAVE_SETSID */ | |
753 | } | |
754 | ||
0ea3f30e DJ |
755 | /* Get all the current tty settings (including whether we have a |
756 | tty at all!). We can't do this in _initialize_inflow because | |
757 | serial_fdopen() won't work until the serial_ops_list is | |
758 | initialized, but we don't want to do it lazily either, so | |
759 | that we can guarantee stdin_serial is opened if there is | |
760 | a terminal. */ | |
761 | void | |
762 | initialize_stdin_serial (void) | |
763 | { | |
764 | stdin_serial = serial_fdopen (0); | |
765 | } | |
766 | ||
c906108c | 767 | void |
fba45db2 | 768 | _initialize_inflow (void) |
c906108c | 769 | { |
11db9430 | 770 | add_info ("terminal", info_terminal_command, |
1bedd215 | 771 | _("Print inferior's saved terminal status.")); |
c906108c | 772 | |
c906108c SS |
773 | terminal_is_ours = 1; |
774 | ||
15652511 SDJ |
775 | /* OK, figure out whether we have job control. */ |
776 | have_job_control (); | |
7e1789f5 | 777 | |
7e1789f5 | 778 | observer_attach_inferior_exit (inflow_inferior_exit); |
6c95b8df PA |
779 | |
780 | inflow_inferior_data | |
8e260fc0 | 781 | = register_inferior_data_with_cleanup (NULL, inflow_inferior_data_cleanup); |
c906108c | 782 | } |