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c906108c | 1 | /* Low level interface to ptrace, for GDB when running under Unix. |
42a4f53d | 2 | Copyright (C) 1986-2019 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" | |
76727919 | 27 | #include "observable.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 | |
0747795c | 37 | #include "common/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 | |
e671cd59 | 49 | static void child_terminal_ours_1 (target_terminal_state); |
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 | |
e671cd59 PA |
57 | corresponding inferior stops, and restore it to the terminal when |
58 | the inferior is resumed in the foreground. */ | |
7e1789f5 PA |
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 | |
e671cd59 | 66 | it when it resumes in the foreground. */ |
7e1789f5 PA |
67 | serial_ttystate ttystate; |
68 | ||
726e1356 | 69 | #ifdef HAVE_TERMIOS_H |
e671cd59 PA |
70 | /* The terminal's foreground process group. Saved whenever the |
71 | inferior stops. This is the pgrp displayed by "info terminal". | |
72 | Note that this may be not the inferior's actual process group, | |
73 | since each inferior that we spawn has its own process group, and | |
74 | only one can be in the foreground at a time. When the inferior | |
75 | resumes, if we can determine the inferior's actual pgrp, then we | |
76 | make that the foreground pgrp instead of what was saved here. | |
77 | While it's a bit arbitrary which inferior's pgrp ends up in the | |
78 | foreground when we resume several inferiors, this at least makes | |
79 | 'resume inf1+inf2' + 'stop all' + 'resume inf2' end up with | |
80 | inf2's pgrp in the foreground instead of inf1's (which would be | |
81 | problematic since it would be left stopped: Ctrl-C wouldn't work, | |
82 | for example). */ | |
726e1356 | 83 | pid_t process_group; |
7e1789f5 | 84 | #endif |
c906108c | 85 | |
7e1789f5 PA |
86 | /* fcntl flags. Saved and restored just like ttystate. */ |
87 | int tflags; | |
88 | }; | |
c906108c | 89 | |
7e1789f5 | 90 | /* Our own tty state, which we restore every time we need to deal with |
d9de1fe3 PA |
91 | the terminal. This is set once, when GDB first starts, and then |
92 | whenever we enter/leave TUI mode (gdb_save_tty_state). The | |
93 | settings of flags which readline saves and restores are | |
7e1789f5 PA |
94 | unimportant. */ |
95 | static struct terminal_info our_terminal_info; | |
c906108c | 96 | |
d9de1fe3 PA |
97 | /* Snapshot of the initial tty state taken during initialization of |
98 | GDB, before readline/ncurses have had a chance to change it. This | |
99 | is used as the initial tty state given to each new spawned | |
100 | inferior. Unlike our_terminal_info, this is only ever set | |
101 | once. */ | |
6a06d660 PP |
102 | static serial_ttystate initial_gdb_ttystate; |
103 | ||
6c95b8df PA |
104 | static struct terminal_info *get_inflow_inferior_data (struct inferior *); |
105 | ||
e2c33ac7 PA |
106 | /* RAII class used to ignore SIGTTOU in a scope. */ |
107 | ||
108 | class scoped_ignore_sigttou | |
109 | { | |
110 | public: | |
111 | scoped_ignore_sigttou () | |
112 | { | |
113 | #ifdef SIGTTOU | |
114 | if (job_control) | |
115 | m_osigttou = signal (SIGTTOU, SIG_IGN); | |
116 | #endif | |
117 | } | |
118 | ||
119 | ~scoped_ignore_sigttou () | |
120 | { | |
121 | #ifdef SIGTTOU | |
122 | if (job_control) | |
123 | signal (SIGTTOU, m_osigttou); | |
124 | #endif | |
125 | } | |
126 | ||
127 | DISABLE_COPY_AND_ASSIGN (scoped_ignore_sigttou); | |
128 | ||
129 | private: | |
130 | #ifdef SIGTTOU | |
131 | sighandler_t m_osigttou = NULL; | |
132 | #endif | |
133 | }; | |
134 | ||
c906108c SS |
135 | /* While the inferior is running, we want SIGINT and SIGQUIT to go to the |
136 | inferior only. If we have job control, that takes care of it. If not, | |
137 | we save our handlers in these two variables and set SIGINT and SIGQUIT | |
138 | to SIG_IGN. */ | |
139 | ||
a40805d4 | 140 | static sighandler_t sigint_ours; |
15766370 | 141 | #ifdef SIGQUIT |
a40805d4 | 142 | static sighandler_t sigquit_ours; |
15766370 | 143 | #endif |
c906108c | 144 | |
7e1789f5 PA |
145 | /* The name of the tty (from the `tty' command) that we're giving to |
146 | the inferior when starting it up. This is only (and should only | |
191c4426 PA |
147 | be) used as a transient global by new_tty_prefork, |
148 | create_tty_session, new_tty and new_tty_postfork, all called from | |
149 | fork_inferior, while forking a new child. */ | |
3cb3b8df | 150 | static const char *inferior_thisrun_terminal; |
c906108c | 151 | |
e671cd59 PA |
152 | /* Track who owns GDB's terminal (is it GDB or some inferior?). While |
153 | target_terminal::is_ours() etc. tracks the core's intention and is | |
154 | independent of the target backend, this tracks the actual state of | |
155 | GDB's own tty. So for example, | |
156 | ||
157 | (target_terminal::is_inferior () && gdb_tty_state == terminal_is_ours) | |
c906108c | 158 | |
e671cd59 PA |
159 | is true when the (native) inferior is not sharing a terminal with |
160 | GDB (e.g., because we attached to an inferior that is running on a | |
161 | different terminal). */ | |
162 | static target_terminal_state gdb_tty_state = target_terminal_state::is_ours; | |
c906108c | 163 | |
d9de1fe3 | 164 | /* See terminal.h. */ |
ea42d6f8 | 165 | |
6a06d660 PP |
166 | void |
167 | set_initial_gdb_ttystate (void) | |
168 | { | |
d9de1fe3 PA |
169 | /* Note we can't do any of this in _initialize_inflow because at |
170 | that point stdin_serial has not been created yet. */ | |
171 | ||
6a06d660 | 172 | initial_gdb_ttystate = serial_get_tty_state (stdin_serial); |
6a06d660 | 173 | |
d9de1fe3 | 174 | if (initial_gdb_ttystate != NULL) |
c906108c | 175 | { |
d9de1fe3 PA |
176 | our_terminal_info.ttystate |
177 | = serial_copy_tty_state (stdin_serial, initial_gdb_ttystate); | |
c906108c | 178 | #ifdef F_GETFL |
7e1789f5 | 179 | our_terminal_info.tflags = fcntl (0, F_GETFL, 0); |
c906108c | 180 | #endif |
726e1356 PA |
181 | #ifdef HAVE_TERMIOS_H |
182 | our_terminal_info.process_group = tcgetpgrp (0); | |
807bddf3 | 183 | #endif |
c906108c SS |
184 | } |
185 | } | |
186 | ||
d9de1fe3 PA |
187 | /* Does GDB have a terminal (on stdin)? */ |
188 | ||
189 | static int | |
190 | gdb_has_a_terminal (void) | |
191 | { | |
192 | return initial_gdb_ttystate != NULL; | |
193 | } | |
194 | ||
c906108c SS |
195 | /* Macro for printing errors from ioctl operations */ |
196 | ||
197 | #define OOPSY(what) \ | |
198 | if (result == -1) \ | |
199 | fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ | |
dc672865 | 200 | what, safe_strerror (errno)) |
c906108c | 201 | |
c906108c SS |
202 | /* Initialize the terminal settings we record for the inferior, |
203 | before we actually run the inferior. */ | |
204 | ||
205 | void | |
556e5da5 | 206 | child_terminal_init (struct target_ops *self) |
c906108c | 207 | { |
e671cd59 PA |
208 | if (!gdb_has_a_terminal ()) |
209 | return; | |
210 | ||
211 | inferior *inf = current_inferior (); | |
212 | terminal_info *tinfo = get_inflow_inferior_data (inf); | |
6f64ef53 | 213 | |
726e1356 | 214 | #ifdef HAVE_TERMIOS_H |
e671cd59 PA |
215 | /* A child we spawn should be a process group leader (PGID==PID) at |
216 | this point, though that may not be true if we're attaching to an | |
217 | existing process. */ | |
556e5da5 | 218 | tinfo->process_group = inf->pid; |
6f64ef53 PA |
219 | #endif |
220 | ||
e671cd59 PA |
221 | xfree (tinfo->ttystate); |
222 | tinfo->ttystate = serial_copy_tty_state (stdin_serial, initial_gdb_ttystate); | |
c906108c SS |
223 | } |
224 | ||
a790ad35 SC |
225 | /* Save the terminal settings again. This is necessary for the TUI |
226 | when it switches to TUI or non-TUI mode; curses changes the terminal | |
227 | and gdb must be able to restore it correctly. */ | |
228 | ||
229 | void | |
3278a9f5 | 230 | gdb_save_tty_state (void) |
a790ad35 SC |
231 | { |
232 | if (gdb_has_a_terminal ()) | |
233 | { | |
7e1789f5 PA |
234 | xfree (our_terminal_info.ttystate); |
235 | our_terminal_info.ttystate = serial_get_tty_state (stdin_serial); | |
a790ad35 SC |
236 | } |
237 | } | |
238 | ||
e671cd59 PA |
239 | /* Try to determine whether TTY is GDB's input terminal. Returns |
240 | TRIBOOL_UNKNOWN if we can't tell. */ | |
4d4ca2a1 | 241 | |
e671cd59 PA |
242 | static tribool |
243 | is_gdb_terminal (const char *tty) | |
244 | { | |
245 | struct stat gdb_tty; | |
246 | struct stat other_tty; | |
247 | int res; | |
248 | ||
249 | res = stat (tty, &other_tty); | |
250 | if (res == -1) | |
251 | return TRIBOOL_UNKNOWN; | |
252 | ||
253 | res = fstat (STDIN_FILENO, &gdb_tty); | |
254 | if (res == -1) | |
255 | return TRIBOOL_UNKNOWN; | |
256 | ||
257 | return ((gdb_tty.st_dev == other_tty.st_dev | |
258 | && gdb_tty.st_ino == other_tty.st_ino) | |
259 | ? TRIBOOL_TRUE | |
260 | : TRIBOOL_FALSE); | |
261 | } | |
262 | ||
263 | /* Helper for sharing_input_terminal. Try to determine whether | |
264 | inferior INF is using the same TTY for input as GDB is. Returns | |
265 | TRIBOOL_UNKNOWN if we can't tell. */ | |
266 | ||
267 | static tribool | |
268 | sharing_input_terminal_1 (inferior *inf) | |
269 | { | |
270 | /* Using host-dependent code here is fine, because the | |
271 | child_terminal_foo functions are meant to be used by child/native | |
272 | targets. */ | |
273 | #if defined (__linux__) || defined (__sun__) | |
274 | char buf[100]; | |
275 | ||
276 | xsnprintf (buf, sizeof (buf), "/proc/%d/fd/0", inf->pid); | |
277 | return is_gdb_terminal (buf); | |
278 | #else | |
279 | return TRIBOOL_UNKNOWN; | |
280 | #endif | |
281 | } | |
282 | ||
283 | /* Return true if the inferior is using the same TTY for input as GDB | |
284 | is. If this is true, then we save/restore terminal flags/state. | |
285 | ||
286 | This is necessary because if inf->attach_flag is set, we don't | |
287 | offhand know whether we are sharing a terminal with the inferior or | |
288 | not. Attaching a process without a terminal is one case where we | |
289 | do not; attaching a process which we ran from the same shell as GDB | |
290 | via `&' is one case where we do. | |
291 | ||
292 | If we can't determine, we assume the TTY is being shared. This | |
293 | works OK if you're only debugging one inferior. However, if you're | |
294 | debugging more than one inferior, and e.g., one is spawned by GDB | |
295 | with "run" (sharing terminal with GDB), and another is attached to | |
296 | (and running on a different terminal, as is most common), then it | |
297 | matters, because we can only restore the terminal settings of one | |
298 | of the inferiors, and in that scenario, we want to restore the | |
299 | settings of the "run"'ed inferior. | |
300 | ||
301 | Note, this is not the same as determining whether GDB and the | |
302 | inferior are in the same session / connected to the same | |
303 | controlling tty. An inferior (fork child) may call setsid, | |
304 | disconnecting itself from the ctty, while still leaving | |
305 | stdin/stdout/stderr associated with the original terminal. If | |
306 | we're debugging that process, we should also save/restore terminal | |
307 | settings. */ | |
308 | ||
309 | static bool | |
310 | sharing_input_terminal (inferior *inf) | |
311 | { | |
312 | terminal_info *tinfo = get_inflow_inferior_data (inf); | |
313 | ||
314 | tribool res = sharing_input_terminal_1 (inf); | |
315 | ||
316 | if (res == TRIBOOL_UNKNOWN) | |
317 | { | |
318 | /* As fallback, if we can't determine by stat'ing the inferior's | |
319 | tty directly (because it's not supported on this host) and | |
320 | the child was spawned, check whether run_terminal is our tty. | |
321 | This isn't ideal, since this is checking the child's | |
322 | controlling terminal, not the input terminal (which may have | |
323 | been redirected), but is still better than nothing. A false | |
324 | positive ("set inferior-tty" points to our terminal, but I/O | |
325 | was redirected) is much more likely than a false negative | |
326 | ("set inferior-tty" points to some other terminal, and then | |
327 | output was redirected to our terminal), and with a false | |
328 | positive we just end up trying to save/restore terminal | |
329 | settings when we didn't need to or we actually can't. */ | |
330 | if (tinfo->run_terminal != NULL) | |
331 | res = is_gdb_terminal (tinfo->run_terminal); | |
332 | ||
333 | /* If we still can't determine, assume yes. */ | |
334 | if (res == TRIBOOL_UNKNOWN) | |
335 | return true; | |
336 | } | |
337 | ||
338 | return res == TRIBOOL_TRUE; | |
339 | } | |
340 | ||
341 | /* Put the inferior's terminal settings into effect. This is | |
342 | preparation for starting or resuming the inferior. */ | |
c906108c SS |
343 | |
344 | void | |
d6b64346 | 345 | child_terminal_inferior (struct target_ops *self) |
c906108c | 346 | { |
e671cd59 PA |
347 | /* If we resume more than one inferior in the foreground on GDB's |
348 | terminal, then the first inferior's terminal settings "win". | |
349 | Note that every child process is put in its own process group, so | |
350 | the first process that ends up resumed ends up determining which | |
351 | process group the kernel forwards Ctrl-C/Ctrl-Z (SIGINT/SIGTTOU) | |
352 | to. */ | |
353 | if (gdb_tty_state == target_terminal_state::is_inferior) | |
7e1789f5 PA |
354 | return; |
355 | ||
e671cd59 PA |
356 | inferior *inf = current_inferior (); |
357 | terminal_info *tinfo = get_inflow_inferior_data (inf); | |
7e1789f5 PA |
358 | |
359 | if (gdb_has_a_terminal () | |
6c95b8df | 360 | && tinfo->ttystate != NULL |
e671cd59 | 361 | && sharing_input_terminal (inf)) |
c906108c SS |
362 | { |
363 | int result; | |
364 | ||
e671cd59 PA |
365 | /* Ignore SIGTTOU since it will happen when we try to set the |
366 | terminal's state (if gdb_tty_state is currently | |
367 | ours_for_output). */ | |
368 | scoped_ignore_sigttou ignore_sigttou; | |
369 | ||
c906108c | 370 | #ifdef F_GETFL |
6c95b8df | 371 | result = fcntl (0, F_SETFL, tinfo->tflags); |
c906108c SS |
372 | OOPSY ("fcntl F_SETFL"); |
373 | #endif | |
374 | ||
726e1356 | 375 | result = serial_set_tty_state (stdin_serial, tinfo->ttystate); |
c906108c SS |
376 | OOPSY ("setting tty state"); |
377 | ||
378 | if (!job_control) | |
379 | { | |
a40805d4 | 380 | sigint_ours = signal (SIGINT, SIG_IGN); |
c906108c | 381 | #ifdef SIGQUIT |
a40805d4 | 382 | sigquit_ours = signal (SIGQUIT, SIG_IGN); |
c906108c SS |
383 | #endif |
384 | } | |
385 | ||
c906108c SS |
386 | if (job_control) |
387 | { | |
726e1356 | 388 | #ifdef HAVE_TERMIOS_H |
e671cd59 PA |
389 | /* If we can't tell the inferior's actual process group, |
390 | then restore whatever was the foreground pgrp the last | |
391 | time the inferior was running. See also comments | |
392 | describing terminal_state::process_group. */ | |
393 | #ifdef HAVE_GETPGID | |
394 | result = tcsetpgrp (0, getpgid (inf->pid)); | |
395 | #else | |
6c95b8df | 396 | result = tcsetpgrp (0, tinfo->process_group); |
e671cd59 PA |
397 | #endif |
398 | if (result == -1) | |
399 | { | |
400 | #if 0 | |
401 | /* This fails if either GDB has no controlling terminal, | |
402 | e.g., running under 'setsid(1)', or if the inferior | |
403 | is not attached to GDB's controlling terminal. E.g., | |
404 | if it called setsid to create a new session or used | |
405 | the TIOCNOTTY ioctl, or simply if we've attached to a | |
406 | process running on another terminal and we couldn't | |
407 | tell whether it was sharing GDB's terminal (and so | |
408 | assumed yes). */ | |
409 | fprintf_unfiltered | |
410 | (gdb_stderr, | |
411 | "[tcsetpgrp failed in child_terminal_inferior: %s]\n", | |
412 | safe_strerror (errno)); | |
413 | #endif | |
414 | } | |
c906108c | 415 | #endif |
c906108c | 416 | } |
e671cd59 PA |
417 | |
418 | gdb_tty_state = target_terminal_state::is_inferior; | |
c906108c | 419 | } |
c906108c SS |
420 | } |
421 | ||
422 | /* Put some of our terminal settings into effect, | |
423 | enough to get proper results from our output, | |
424 | but do not change into or out of RAW mode | |
425 | so that no input is discarded. | |
426 | ||
427 | After doing this, either terminal_ours or terminal_inferior | |
4d4ca2a1 DE |
428 | should be called to get back to a normal state of affairs. |
429 | ||
430 | N.B. The implementation is (currently) no different than | |
431 | child_terminal_ours. See child_terminal_ours_1. */ | |
c906108c SS |
432 | |
433 | void | |
d6b64346 | 434 | child_terminal_ours_for_output (struct target_ops *self) |
c906108c | 435 | { |
e671cd59 | 436 | child_terminal_ours_1 (target_terminal_state::is_ours_for_output); |
c906108c SS |
437 | } |
438 | ||
439 | /* Put our terminal settings into effect. | |
440 | First record the inferior's terminal settings | |
4d4ca2a1 DE |
441 | so they can be restored properly later. |
442 | ||
443 | N.B. Targets that want to use this with async support must build that | |
444 | support on top of this (e.g., the caller still needs to add stdin to the | |
445 | event loop). E.g., see linux_nat_terminal_ours. */ | |
c906108c SS |
446 | |
447 | void | |
d6b64346 | 448 | child_terminal_ours (struct target_ops *self) |
c906108c | 449 | { |
e671cd59 | 450 | child_terminal_ours_1 (target_terminal_state::is_ours); |
c906108c SS |
451 | } |
452 | ||
e671cd59 PA |
453 | /* Save the current terminal settings in the inferior's terminal_info |
454 | cache. */ | |
c906108c | 455 | |
e671cd59 PA |
456 | void |
457 | child_terminal_save_inferior (struct target_ops *self) | |
c906108c | 458 | { |
e671cd59 PA |
459 | /* Avoid attempting all the ioctl's when running in batch. */ |
460 | if (!gdb_has_a_terminal ()) | |
461 | return; | |
7e1789f5 | 462 | |
e671cd59 PA |
463 | inferior *inf = current_inferior (); |
464 | terminal_info *tinfo = get_inflow_inferior_data (inf); | |
465 | ||
466 | /* No need to save/restore if the inferior is not sharing GDB's | |
467 | tty. */ | |
468 | if (!sharing_input_terminal (inf)) | |
7e1789f5 PA |
469 | return; |
470 | ||
e671cd59 PA |
471 | xfree (tinfo->ttystate); |
472 | tinfo->ttystate = serial_get_tty_state (stdin_serial); | |
d9d2d8b6 | 473 | |
f6cfb427 | 474 | #ifdef HAVE_TERMIOS_H |
e671cd59 | 475 | tinfo->process_group = tcgetpgrp (0); |
f6cfb427 | 476 | #endif |
7e1789f5 | 477 | |
e671cd59 PA |
478 | #ifdef F_GETFL |
479 | tinfo->tflags = fcntl (0, F_GETFL, 0); | |
480 | #endif | |
481 | } | |
482 | ||
483 | /* Switch terminal state to DESIRED_STATE, either is_ours, or | |
484 | is_ours_for_output. */ | |
7e1789f5 | 485 | |
e671cd59 PA |
486 | static void |
487 | child_terminal_ours_1 (target_terminal_state desired_state) | |
488 | { | |
489 | gdb_assert (desired_state != target_terminal_state::is_inferior); | |
490 | ||
491 | /* Avoid attempting all the ioctl's when running in batch. */ | |
492 | if (!gdb_has_a_terminal ()) | |
c906108c | 493 | return; |
e671cd59 PA |
494 | |
495 | if (gdb_tty_state != desired_state) | |
c906108c | 496 | { |
821fc4ae | 497 | int result ATTRIBUTE_UNUSED; |
c906108c | 498 | |
e2c33ac7 PA |
499 | /* Ignore SIGTTOU since it will happen when we try to set the |
500 | terminal's pgrp. */ | |
501 | scoped_ignore_sigttou ignore_sigttou; | |
c906108c | 502 | |
726e1356 PA |
503 | /* Set tty state to our_ttystate. */ |
504 | serial_set_tty_state (stdin_serial, our_terminal_info.ttystate); | |
c906108c | 505 | |
e671cd59 PA |
506 | /* If we only want output, then leave the inferior's pgrp in the |
507 | foreground, so that Ctrl-C/Ctrl-Z reach the inferior | |
508 | directly. */ | |
509 | if (job_control && desired_state == target_terminal_state::is_ours) | |
c906108c | 510 | { |
726e1356 | 511 | #ifdef HAVE_TERMIOS_H |
7e1789f5 | 512 | result = tcsetpgrp (0, our_terminal_info.process_group); |
c906108c SS |
513 | #if 0 |
514 | /* This fails on Ultrix with EINVAL if you run the testsuite | |
515 | in the background with nohup, and then log out. GDB never | |
516 | used to check for an error here, so perhaps there are other | |
517 | such situations as well. */ | |
518 | if (result == -1) | |
3e43a32a | 519 | fprintf_unfiltered (gdb_stderr, |
d6b64346 | 520 | "[tcsetpgrp failed in child_terminal_ours: %s]\n", |
dc672865 | 521 | safe_strerror (errno)); |
c906108c SS |
522 | #endif |
523 | #endif /* termios */ | |
c906108c SS |
524 | } |
525 | ||
e671cd59 | 526 | if (!job_control && desired_state == target_terminal_state::is_ours) |
c906108c SS |
527 | { |
528 | signal (SIGINT, sigint_ours); | |
529 | #ifdef SIGQUIT | |
530 | signal (SIGQUIT, sigquit_ours); | |
531 | #endif | |
532 | } | |
533 | ||
534 | #ifdef F_GETFL | |
7e1789f5 | 535 | result = fcntl (0, F_SETFL, our_terminal_info.tflags); |
c906108c | 536 | #endif |
e671cd59 PA |
537 | |
538 | gdb_tty_state = desired_state; | |
539 | } | |
540 | } | |
541 | ||
542 | /* Interrupt the inferior. Implementation of target_interrupt for | |
543 | child/native targets. */ | |
544 | ||
545 | void | |
546 | child_interrupt (struct target_ops *self) | |
547 | { | |
548 | /* Interrupt the first inferior that has a resumed thread. */ | |
e671cd59 | 549 | thread_info *resumed = NULL; |
08036331 | 550 | for (thread_info *thr : all_non_exited_threads ()) |
e671cd59 PA |
551 | { |
552 | if (thr->executing) | |
553 | { | |
554 | resumed = thr; | |
555 | break; | |
556 | } | |
557 | if (thr->suspend.waitstatus_pending_p) | |
558 | resumed = thr; | |
559 | } | |
560 | ||
561 | if (resumed != NULL) | |
562 | { | |
563 | /* Note that unlike pressing Ctrl-C on the controlling terminal, | |
564 | here we only interrupt one process, not the whole process | |
565 | group. This is because interrupting a process group (with | |
566 | either Ctrl-C or with kill(3) with negative PID) sends a | |
567 | SIGINT to each process in the process group, and we may not | |
568 | be debugging all processes in the process group. */ | |
f6cfb427 | 569 | #ifndef _WIN32 |
e671cd59 | 570 | kill (resumed->inf->pid, SIGINT); |
f6cfb427 | 571 | #endif |
e671cd59 PA |
572 | } |
573 | } | |
574 | ||
575 | /* Pass a Ctrl-C to the inferior as-if a Ctrl-C was pressed while the | |
576 | inferior was in the foreground. Implementation of | |
577 | target_pass_ctrlc for child/native targets. */ | |
578 | ||
579 | void | |
580 | child_pass_ctrlc (struct target_ops *self) | |
581 | { | |
582 | gdb_assert (!target_terminal::is_ours ()); | |
583 | ||
584 | #ifdef HAVE_TERMIOS_H | |
585 | if (job_control) | |
586 | { | |
587 | pid_t term_pgrp = tcgetpgrp (0); | |
588 | ||
589 | /* If there's any inferior sharing our terminal, pass the SIGINT | |
590 | to the terminal's foreground process group. This acts just | |
591 | like the user typed a ^C on the terminal while the inferior | |
592 | was in the foreground. Note that using a negative process | |
593 | number in kill() is a System V-ism. The proper BSD interface | |
594 | is killpg(). However, all modern BSDs support the System V | |
595 | interface too. */ | |
596 | ||
597 | if (term_pgrp != -1 && term_pgrp != our_terminal_info.process_group) | |
598 | { | |
599 | kill (-term_pgrp, SIGINT); | |
600 | return; | |
601 | } | |
602 | } | |
603 | #endif | |
604 | ||
605 | /* Otherwise, pass the Ctrl-C to the first inferior that was resumed | |
606 | in the foreground. */ | |
08036331 | 607 | for (inferior *inf : all_inferiors ()) |
e671cd59 PA |
608 | { |
609 | if (inf->terminal_state != target_terminal_state::is_ours) | |
610 | { | |
611 | gdb_assert (inf->pid != 0); | |
612 | ||
f6cfb427 | 613 | #ifndef _WIN32 |
e671cd59 | 614 | kill (inf->pid, SIGINT); |
f6cfb427 | 615 | #endif |
e671cd59 PA |
616 | return; |
617 | } | |
c906108c | 618 | } |
e671cd59 PA |
619 | |
620 | /* If no inferior was resumed in the foreground, then how did the | |
621 | !is_ours assert above pass? */ | |
622 | gdb_assert_not_reached ("no inferior resumed in the fg found"); | |
c906108c SS |
623 | } |
624 | ||
6c95b8df PA |
625 | /* Per-inferior data key. */ |
626 | static const struct inferior_data *inflow_inferior_data; | |
7e1789f5 PA |
627 | |
628 | static void | |
6c95b8df | 629 | inflow_inferior_data_cleanup (struct inferior *inf, void *arg) |
7e1789f5 | 630 | { |
9a3c8263 | 631 | struct terminal_info *info = (struct terminal_info *) arg; |
6c95b8df | 632 | |
487ad57c YQ |
633 | xfree (info->run_terminal); |
634 | xfree (info->ttystate); | |
635 | xfree (info); | |
6c95b8df PA |
636 | } |
637 | ||
638 | /* Get the current svr4 data. If none is found yet, add it now. This | |
639 | function always returns a valid object. */ | |
640 | ||
641 | static struct terminal_info * | |
642 | get_inflow_inferior_data (struct inferior *inf) | |
643 | { | |
644 | struct terminal_info *info; | |
645 | ||
9a3c8263 | 646 | info = (struct terminal_info *) inferior_data (inf, inflow_inferior_data); |
6c95b8df PA |
647 | if (info == NULL) |
648 | { | |
41bf6aca | 649 | info = XCNEW (struct terminal_info); |
6c95b8df PA |
650 | set_inferior_data (inf, inflow_inferior_data, info); |
651 | } | |
7e1789f5 | 652 | |
6c95b8df | 653 | return info; |
7e1789f5 PA |
654 | } |
655 | ||
656 | /* This is a "inferior_exit" observer. Releases the TERMINAL_INFO member | |
657 | of the inferior structure. This field is private to inflow.c, and | |
658 | its type is opaque to the rest of GDB. PID is the target pid of | |
659 | the inferior that is about to be removed from the inferior | |
660 | list. */ | |
661 | ||
662 | static void | |
a79b8f6e | 663 | inflow_inferior_exit (struct inferior *inf) |
7e1789f5 | 664 | { |
6c95b8df | 665 | struct terminal_info *info; |
7e1789f5 | 666 | |
e671cd59 PA |
667 | inf->terminal_state = target_terminal_state::is_ours; |
668 | ||
9a3c8263 | 669 | info = (struct terminal_info *) inferior_data (inf, inflow_inferior_data); |
6c95b8df PA |
670 | if (info != NULL) |
671 | { | |
672 | xfree (info->run_terminal); | |
1e182ce8 | 673 | xfree (info->ttystate); |
6c95b8df PA |
674 | xfree (info); |
675 | set_inferior_data (inf, inflow_inferior_data, NULL); | |
676 | } | |
7e1789f5 PA |
677 | } |
678 | ||
191c4426 PA |
679 | void |
680 | copy_terminal_info (struct inferior *to, struct inferior *from) | |
681 | { | |
6c95b8df PA |
682 | struct terminal_info *tinfo_to, *tinfo_from; |
683 | ||
684 | tinfo_to = get_inflow_inferior_data (to); | |
685 | tinfo_from = get_inflow_inferior_data (from); | |
1e182ce8 UW |
686 | |
687 | xfree (tinfo_to->run_terminal); | |
688 | xfree (tinfo_to->ttystate); | |
689 | ||
6c95b8df | 690 | *tinfo_to = *tinfo_from; |
1e182ce8 | 691 | |
6c95b8df PA |
692 | if (tinfo_from->run_terminal) |
693 | tinfo_to->run_terminal | |
694 | = xstrdup (tinfo_from->run_terminal); | |
1e182ce8 UW |
695 | |
696 | if (tinfo_from->ttystate) | |
697 | tinfo_to->ttystate | |
698 | = serial_copy_tty_state (stdin_serial, tinfo_from->ttystate); | |
e671cd59 PA |
699 | |
700 | to->terminal_state = from->terminal_state; | |
191c4426 PA |
701 | } |
702 | ||
35ed81d4 SM |
703 | /* See terminal.h. */ |
704 | ||
705 | void | |
706 | swap_terminal_info (inferior *a, inferior *b) | |
707 | { | |
708 | terminal_info *info_a | |
709 | = (terminal_info *) inferior_data (a, inflow_inferior_data); | |
710 | terminal_info *info_b | |
711 | = (terminal_info *) inferior_data (a, inflow_inferior_data); | |
712 | ||
713 | set_inferior_data (a, inflow_inferior_data, info_b); | |
714 | set_inferior_data (b, inflow_inferior_data, info_a); | |
715 | ||
716 | std::swap (a->terminal_state, b->terminal_state); | |
717 | } | |
718 | ||
c906108c | 719 | void |
1d12d88f | 720 | info_terminal_command (const char *arg, int from_tty) |
c906108c | 721 | { |
223ffa71 | 722 | target_terminal::info (arg, from_tty); |
c906108c SS |
723 | } |
724 | ||
c906108c | 725 | void |
0a4f40a2 | 726 | child_terminal_info (struct target_ops *self, const char *args, int from_tty) |
c906108c | 727 | { |
7e1789f5 | 728 | struct inferior *inf; |
6c95b8df | 729 | struct terminal_info *tinfo; |
7e1789f5 | 730 | |
c906108c SS |
731 | if (!gdb_has_a_terminal ()) |
732 | { | |
a3f17187 | 733 | printf_filtered (_("This GDB does not control a terminal.\n")); |
c906108c SS |
734 | return; |
735 | } | |
736 | ||
d7e15655 | 737 | if (inferior_ptid == null_ptid) |
7e1789f5 PA |
738 | return; |
739 | ||
740 | inf = current_inferior (); | |
6c95b8df | 741 | tinfo = get_inflow_inferior_data (inf); |
7e1789f5 | 742 | |
3e43a32a MS |
743 | printf_filtered (_("Inferior's terminal status " |
744 | "(currently saved by GDB):\n")); | |
c906108c SS |
745 | |
746 | /* First the fcntl flags. */ | |
747 | { | |
748 | int flags; | |
c5aa993b | 749 | |
6c95b8df | 750 | flags = tinfo->tflags; |
c906108c SS |
751 | |
752 | printf_filtered ("File descriptor flags = "); | |
753 | ||
754 | #ifndef O_ACCMODE | |
755 | #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) | |
756 | #endif | |
1777feb0 | 757 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug. */ |
c906108c SS |
758 | switch (flags & (O_ACCMODE)) |
759 | { | |
c5aa993b JM |
760 | case O_RDONLY: |
761 | printf_filtered ("O_RDONLY"); | |
762 | break; | |
763 | case O_WRONLY: | |
764 | printf_filtered ("O_WRONLY"); | |
765 | break; | |
766 | case O_RDWR: | |
767 | printf_filtered ("O_RDWR"); | |
768 | break; | |
c906108c SS |
769 | } |
770 | flags &= ~(O_ACCMODE); | |
771 | ||
772 | #ifdef O_NONBLOCK | |
c5aa993b | 773 | if (flags & O_NONBLOCK) |
c906108c SS |
774 | printf_filtered (" | O_NONBLOCK"); |
775 | flags &= ~O_NONBLOCK; | |
776 | #endif | |
c5aa993b | 777 | |
c906108c SS |
778 | #if defined (O_NDELAY) |
779 | /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will | |
780 | print it as O_NONBLOCK, which is good cause that is what POSIX | |
781 | has, and the flag will already be cleared by the time we get here. */ | |
782 | if (flags & O_NDELAY) | |
783 | printf_filtered (" | O_NDELAY"); | |
784 | flags &= ~O_NDELAY; | |
785 | #endif | |
786 | ||
787 | if (flags & O_APPEND) | |
788 | printf_filtered (" | O_APPEND"); | |
789 | flags &= ~O_APPEND; | |
790 | ||
791 | #if defined (O_BINARY) | |
792 | if (flags & O_BINARY) | |
793 | printf_filtered (" | O_BINARY"); | |
794 | flags &= ~O_BINARY; | |
795 | #endif | |
796 | ||
797 | if (flags) | |
798 | printf_filtered (" | 0x%x", flags); | |
799 | printf_filtered ("\n"); | |
800 | } | |
801 | ||
726e1356 | 802 | #ifdef HAVE_TERMIOS_H |
6c95b8df | 803 | printf_filtered ("Process group = %d\n", (int) tinfo->process_group); |
c906108c SS |
804 | #endif |
805 | ||
6c95b8df | 806 | serial_print_tty_state (stdin_serial, tinfo->ttystate, gdb_stdout); |
c906108c SS |
807 | } |
808 | \f | |
809 | /* NEW_TTY_PREFORK is called before forking a new child process, | |
810 | so we can record the state of ttys in the child to be formed. | |
811 | TTYNAME is null if we are to share the terminal with gdb; | |
812 | or points to a string containing the name of the desired tty. | |
813 | ||
814 | NEW_TTY is called in new child processes under Unix, which will | |
815 | become debugger target processes. This actually switches to | |
816 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
817 | ||
818 | void | |
3cb3b8df | 819 | new_tty_prefork (const char *ttyname) |
c906108c SS |
820 | { |
821 | /* Save the name for later, for determining whether we and the child | |
822 | are sharing a tty. */ | |
823 | inferior_thisrun_terminal = ttyname; | |
824 | } | |
825 | ||
e6d088ec | 826 | #if !defined(__GO32__) && !defined(_WIN32) |
bf1d7d9c JB |
827 | /* If RESULT, assumed to be the return value from a system call, is |
828 | negative, print the error message indicated by errno and exit. | |
829 | MSG should identify the operation that failed. */ | |
830 | static void | |
831 | check_syscall (const char *msg, int result) | |
832 | { | |
833 | if (result < 0) | |
834 | { | |
835 | print_sys_errmsg (msg, errno); | |
836 | _exit (1); | |
837 | } | |
838 | } | |
e6d088ec | 839 | #endif |
bf1d7d9c | 840 | |
c906108c | 841 | void |
fba45db2 | 842 | new_tty (void) |
c906108c | 843 | { |
c906108c SS |
844 | if (inferior_thisrun_terminal == 0) |
845 | return; | |
846 | #if !defined(__GO32__) && !defined(_WIN32) | |
15766370 TT |
847 | int tty; |
848 | ||
c906108c SS |
849 | #ifdef TIOCNOTTY |
850 | /* Disconnect the child process from our controlling terminal. On some | |
851 | systems (SVR4 for example), this may cause a SIGTTOU, so temporarily | |
1777feb0 | 852 | ignore SIGTTOU. */ |
c5aa993b | 853 | tty = open ("/dev/tty", O_RDWR); |
c906108c SS |
854 | if (tty > 0) |
855 | { | |
e2c33ac7 | 856 | scoped_ignore_sigttou ignore_sigttou; |
c906108c | 857 | |
c5aa993b JM |
858 | ioctl (tty, TIOCNOTTY, 0); |
859 | close (tty); | |
c906108c SS |
860 | } |
861 | #endif | |
862 | ||
863 | /* Now open the specified new terminal. */ | |
c5aa993b | 864 | tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
bf1d7d9c | 865 | check_syscall (inferior_thisrun_terminal, tty); |
c906108c SS |
866 | |
867 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
868 | if (tty != 0) | |
c5aa993b JM |
869 | { |
870 | close (0); | |
bf1d7d9c | 871 | check_syscall ("dup'ing tty into fd 0", dup (tty)); |
c5aa993b | 872 | } |
c906108c | 873 | if (tty != 1) |
c5aa993b JM |
874 | { |
875 | close (1); | |
bf1d7d9c | 876 | check_syscall ("dup'ing tty into fd 1", dup (tty)); |
c5aa993b | 877 | } |
c906108c | 878 | if (tty != 2) |
c5aa993b JM |
879 | { |
880 | close (2); | |
bf1d7d9c | 881 | check_syscall ("dup'ing tty into fd 2", dup (tty)); |
c5aa993b | 882 | } |
83116857 TJB |
883 | |
884 | #ifdef TIOCSCTTY | |
885 | /* Make tty our new controlling terminal. */ | |
886 | if (ioctl (tty, TIOCSCTTY, 0) == -1) | |
887 | /* Mention GDB in warning because it will appear in the inferior's | |
888 | terminal instead of GDB's. */ | |
a73c6dcd | 889 | warning (_("GDB: Failed to set controlling terminal: %s"), |
83116857 TJB |
890 | safe_strerror (errno)); |
891 | #endif | |
892 | ||
c906108c | 893 | if (tty > 2) |
c5aa993b JM |
894 | close (tty); |
895 | #endif /* !go32 && !win32 */ | |
c906108c | 896 | } |
191c4426 PA |
897 | |
898 | /* NEW_TTY_POSTFORK is called after forking a new child process, and | |
899 | adding it to the inferior table, to store the TTYNAME being used by | |
900 | the child, or null if it sharing the terminal with gdb. */ | |
901 | ||
902 | void | |
903 | new_tty_postfork (void) | |
904 | { | |
905 | /* Save the name for later, for determining whether we and the child | |
906 | are sharing a tty. */ | |
907 | ||
908 | if (inferior_thisrun_terminal) | |
6c95b8df PA |
909 | { |
910 | struct inferior *inf = current_inferior (); | |
911 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); | |
912 | ||
913 | tinfo->run_terminal = xstrdup (inferior_thisrun_terminal); | |
914 | } | |
191c4426 PA |
915 | |
916 | inferior_thisrun_terminal = NULL; | |
917 | } | |
918 | ||
c906108c SS |
919 | \f |
920 | /* Call set_sigint_trap when you need to pass a signal on to an attached | |
1777feb0 | 921 | process when handling SIGINT. */ |
c906108c | 922 | |
c906108c | 923 | static void |
fba45db2 | 924 | pass_signal (int signo) |
c906108c SS |
925 | { |
926 | #ifndef _WIN32 | |
e99b03dc | 927 | kill (inferior_ptid.pid (), SIGINT); |
c906108c SS |
928 | #endif |
929 | } | |
930 | ||
a40805d4 | 931 | static sighandler_t osig; |
7e1789f5 | 932 | static int osig_set; |
c906108c SS |
933 | |
934 | void | |
fba45db2 | 935 | set_sigint_trap (void) |
c906108c | 936 | { |
181e7f93 | 937 | struct inferior *inf = current_inferior (); |
6c95b8df PA |
938 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); |
939 | ||
940 | if (inf->attach_flag || tinfo->run_terminal) | |
c906108c | 941 | { |
a40805d4 | 942 | osig = signal (SIGINT, pass_signal); |
7e1789f5 | 943 | osig_set = 1; |
c906108c | 944 | } |
7e1789f5 PA |
945 | else |
946 | osig_set = 0; | |
c906108c SS |
947 | } |
948 | ||
949 | void | |
fba45db2 | 950 | clear_sigint_trap (void) |
c906108c | 951 | { |
7e1789f5 | 952 | if (osig_set) |
c906108c SS |
953 | { |
954 | signal (SIGINT, osig); | |
7e1789f5 | 955 | osig_set = 0; |
c906108c SS |
956 | } |
957 | } | |
958 | \f | |
c906108c | 959 | |
83116857 TJB |
960 | /* Create a new session if the inferior will run in a different tty. |
961 | A session is UNIX's way of grouping processes that share a controlling | |
962 | terminal, so a new one is needed if the inferior terminal will be | |
963 | different from GDB's. | |
964 | ||
965 | Returns the session id of the new session, 0 if no session was created | |
966 | or -1 if an error occurred. */ | |
967 | pid_t | |
968 | create_tty_session (void) | |
969 | { | |
970 | #ifdef HAVE_SETSID | |
971 | pid_t ret; | |
972 | ||
973 | if (!job_control || inferior_thisrun_terminal == 0) | |
974 | return 0; | |
975 | ||
976 | ret = setsid (); | |
977 | if (ret == -1) | |
a73c6dcd | 978 | warning (_("Failed to create new terminal session: setsid: %s"), |
83116857 TJB |
979 | safe_strerror (errno)); |
980 | ||
981 | return ret; | |
982 | #else | |
983 | return 0; | |
984 | #endif /* HAVE_SETSID */ | |
985 | } | |
986 | ||
0ea3f30e DJ |
987 | /* Get all the current tty settings (including whether we have a |
988 | tty at all!). We can't do this in _initialize_inflow because | |
989 | serial_fdopen() won't work until the serial_ops_list is | |
990 | initialized, but we don't want to do it lazily either, so | |
991 | that we can guarantee stdin_serial is opened if there is | |
992 | a terminal. */ | |
993 | void | |
994 | initialize_stdin_serial (void) | |
995 | { | |
996 | stdin_serial = serial_fdopen (0); | |
997 | } | |
998 | ||
c906108c | 999 | void |
fba45db2 | 1000 | _initialize_inflow (void) |
c906108c | 1001 | { |
11db9430 | 1002 | add_info ("terminal", info_terminal_command, |
1bedd215 | 1003 | _("Print inferior's saved terminal status.")); |
c906108c | 1004 | |
15652511 SDJ |
1005 | /* OK, figure out whether we have job control. */ |
1006 | have_job_control (); | |
7e1789f5 | 1007 | |
76727919 | 1008 | gdb::observers::inferior_exit.attach (inflow_inferior_exit); |
6c95b8df PA |
1009 | |
1010 | inflow_inferior_data | |
8e260fc0 | 1011 | = register_inferior_data_with_cleanup (NULL, inflow_inferior_data_cleanup); |
c906108c | 1012 | } |