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c906108c | 1 | /* Low level interface to ptrace, for GDB when running under Unix. |
e2882c85 | 2 | Copyright (C) 1986-2018 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 | |
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 | |
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 PA |
140 | static sighandler_t sigint_ours; |
141 | static sighandler_t sigquit_ours; | |
c906108c | 142 | |
7e1789f5 PA |
143 | /* The name of the tty (from the `tty' command) that we're giving to |
144 | the inferior when starting it up. This is only (and should only | |
191c4426 PA |
145 | be) used as a transient global by new_tty_prefork, |
146 | create_tty_session, new_tty and new_tty_postfork, all called from | |
147 | fork_inferior, while forking a new child. */ | |
3cb3b8df | 148 | static const char *inferior_thisrun_terminal; |
c906108c | 149 | |
e671cd59 PA |
150 | /* Track who owns GDB's terminal (is it GDB or some inferior?). While |
151 | target_terminal::is_ours() etc. tracks the core's intention and is | |
152 | independent of the target backend, this tracks the actual state of | |
153 | GDB's own tty. So for example, | |
154 | ||
155 | (target_terminal::is_inferior () && gdb_tty_state == terminal_is_ours) | |
c906108c | 156 | |
e671cd59 PA |
157 | is true when the (native) inferior is not sharing a terminal with |
158 | GDB (e.g., because we attached to an inferior that is running on a | |
159 | different terminal). */ | |
160 | static target_terminal_state gdb_tty_state = target_terminal_state::is_ours; | |
c906108c | 161 | |
d9de1fe3 | 162 | /* See terminal.h. */ |
ea42d6f8 | 163 | |
6a06d660 PP |
164 | void |
165 | set_initial_gdb_ttystate (void) | |
166 | { | |
d9de1fe3 PA |
167 | /* Note we can't do any of this in _initialize_inflow because at |
168 | that point stdin_serial has not been created yet. */ | |
169 | ||
6a06d660 | 170 | initial_gdb_ttystate = serial_get_tty_state (stdin_serial); |
6a06d660 | 171 | |
d9de1fe3 | 172 | if (initial_gdb_ttystate != NULL) |
c906108c | 173 | { |
d9de1fe3 PA |
174 | our_terminal_info.ttystate |
175 | = serial_copy_tty_state (stdin_serial, initial_gdb_ttystate); | |
c906108c | 176 | #ifdef F_GETFL |
7e1789f5 | 177 | our_terminal_info.tflags = fcntl (0, F_GETFL, 0); |
c906108c | 178 | #endif |
726e1356 PA |
179 | #ifdef HAVE_TERMIOS_H |
180 | our_terminal_info.process_group = tcgetpgrp (0); | |
807bddf3 | 181 | #endif |
c906108c SS |
182 | } |
183 | } | |
184 | ||
d9de1fe3 PA |
185 | /* Does GDB have a terminal (on stdin)? */ |
186 | ||
187 | static int | |
188 | gdb_has_a_terminal (void) | |
189 | { | |
190 | return initial_gdb_ttystate != NULL; | |
191 | } | |
192 | ||
c906108c SS |
193 | /* Macro for printing errors from ioctl operations */ |
194 | ||
195 | #define OOPSY(what) \ | |
196 | if (result == -1) \ | |
197 | fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ | |
dc672865 | 198 | what, safe_strerror (errno)) |
c906108c | 199 | |
c906108c SS |
200 | /* Initialize the terminal settings we record for the inferior, |
201 | before we actually run the inferior. */ | |
202 | ||
203 | void | |
556e5da5 | 204 | child_terminal_init (struct target_ops *self) |
c906108c | 205 | { |
e671cd59 PA |
206 | if (!gdb_has_a_terminal ()) |
207 | return; | |
208 | ||
209 | inferior *inf = current_inferior (); | |
210 | terminal_info *tinfo = get_inflow_inferior_data (inf); | |
6f64ef53 | 211 | |
726e1356 | 212 | #ifdef HAVE_TERMIOS_H |
e671cd59 PA |
213 | /* A child we spawn should be a process group leader (PGID==PID) at |
214 | this point, though that may not be true if we're attaching to an | |
215 | existing process. */ | |
556e5da5 | 216 | tinfo->process_group = inf->pid; |
6f64ef53 PA |
217 | #endif |
218 | ||
e671cd59 PA |
219 | xfree (tinfo->ttystate); |
220 | tinfo->ttystate = serial_copy_tty_state (stdin_serial, initial_gdb_ttystate); | |
c906108c SS |
221 | } |
222 | ||
a790ad35 SC |
223 | /* Save the terminal settings again. This is necessary for the TUI |
224 | when it switches to TUI or non-TUI mode; curses changes the terminal | |
225 | and gdb must be able to restore it correctly. */ | |
226 | ||
227 | void | |
3278a9f5 | 228 | gdb_save_tty_state (void) |
a790ad35 SC |
229 | { |
230 | if (gdb_has_a_terminal ()) | |
231 | { | |
7e1789f5 PA |
232 | xfree (our_terminal_info.ttystate); |
233 | our_terminal_info.ttystate = serial_get_tty_state (stdin_serial); | |
a790ad35 SC |
234 | } |
235 | } | |
236 | ||
e671cd59 PA |
237 | /* Try to determine whether TTY is GDB's input terminal. Returns |
238 | TRIBOOL_UNKNOWN if we can't tell. */ | |
4d4ca2a1 | 239 | |
e671cd59 PA |
240 | static tribool |
241 | is_gdb_terminal (const char *tty) | |
242 | { | |
243 | struct stat gdb_tty; | |
244 | struct stat other_tty; | |
245 | int res; | |
246 | ||
247 | res = stat (tty, &other_tty); | |
248 | if (res == -1) | |
249 | return TRIBOOL_UNKNOWN; | |
250 | ||
251 | res = fstat (STDIN_FILENO, &gdb_tty); | |
252 | if (res == -1) | |
253 | return TRIBOOL_UNKNOWN; | |
254 | ||
255 | return ((gdb_tty.st_dev == other_tty.st_dev | |
256 | && gdb_tty.st_ino == other_tty.st_ino) | |
257 | ? TRIBOOL_TRUE | |
258 | : TRIBOOL_FALSE); | |
259 | } | |
260 | ||
261 | /* Helper for sharing_input_terminal. Try to determine whether | |
262 | inferior INF is using the same TTY for input as GDB is. Returns | |
263 | TRIBOOL_UNKNOWN if we can't tell. */ | |
264 | ||
265 | static tribool | |
266 | sharing_input_terminal_1 (inferior *inf) | |
267 | { | |
268 | /* Using host-dependent code here is fine, because the | |
269 | child_terminal_foo functions are meant to be used by child/native | |
270 | targets. */ | |
271 | #if defined (__linux__) || defined (__sun__) | |
272 | char buf[100]; | |
273 | ||
274 | xsnprintf (buf, sizeof (buf), "/proc/%d/fd/0", inf->pid); | |
275 | return is_gdb_terminal (buf); | |
276 | #else | |
277 | return TRIBOOL_UNKNOWN; | |
278 | #endif | |
279 | } | |
280 | ||
281 | /* Return true if the inferior is using the same TTY for input as GDB | |
282 | is. If this is true, then we save/restore terminal flags/state. | |
283 | ||
284 | This is necessary because if inf->attach_flag is set, we don't | |
285 | offhand know whether we are sharing a terminal with the inferior or | |
286 | not. Attaching a process without a terminal is one case where we | |
287 | do not; attaching a process which we ran from the same shell as GDB | |
288 | via `&' is one case where we do. | |
289 | ||
290 | If we can't determine, we assume the TTY is being shared. This | |
291 | works OK if you're only debugging one inferior. However, if you're | |
292 | debugging more than one inferior, and e.g., one is spawned by GDB | |
293 | with "run" (sharing terminal with GDB), and another is attached to | |
294 | (and running on a different terminal, as is most common), then it | |
295 | matters, because we can only restore the terminal settings of one | |
296 | of the inferiors, and in that scenario, we want to restore the | |
297 | settings of the "run"'ed inferior. | |
298 | ||
299 | Note, this is not the same as determining whether GDB and the | |
300 | inferior are in the same session / connected to the same | |
301 | controlling tty. An inferior (fork child) may call setsid, | |
302 | disconnecting itself from the ctty, while still leaving | |
303 | stdin/stdout/stderr associated with the original terminal. If | |
304 | we're debugging that process, we should also save/restore terminal | |
305 | settings. */ | |
306 | ||
307 | static bool | |
308 | sharing_input_terminal (inferior *inf) | |
309 | { | |
310 | terminal_info *tinfo = get_inflow_inferior_data (inf); | |
311 | ||
312 | tribool res = sharing_input_terminal_1 (inf); | |
313 | ||
314 | if (res == TRIBOOL_UNKNOWN) | |
315 | { | |
316 | /* As fallback, if we can't determine by stat'ing the inferior's | |
317 | tty directly (because it's not supported on this host) and | |
318 | the child was spawned, check whether run_terminal is our tty. | |
319 | This isn't ideal, since this is checking the child's | |
320 | controlling terminal, not the input terminal (which may have | |
321 | been redirected), but is still better than nothing. A false | |
322 | positive ("set inferior-tty" points to our terminal, but I/O | |
323 | was redirected) is much more likely than a false negative | |
324 | ("set inferior-tty" points to some other terminal, and then | |
325 | output was redirected to our terminal), and with a false | |
326 | positive we just end up trying to save/restore terminal | |
327 | settings when we didn't need to or we actually can't. */ | |
328 | if (tinfo->run_terminal != NULL) | |
329 | res = is_gdb_terminal (tinfo->run_terminal); | |
330 | ||
331 | /* If we still can't determine, assume yes. */ | |
332 | if (res == TRIBOOL_UNKNOWN) | |
333 | return true; | |
334 | } | |
335 | ||
336 | return res == TRIBOOL_TRUE; | |
337 | } | |
338 | ||
339 | /* Put the inferior's terminal settings into effect. This is | |
340 | preparation for starting or resuming the inferior. */ | |
c906108c SS |
341 | |
342 | void | |
d6b64346 | 343 | child_terminal_inferior (struct target_ops *self) |
c906108c | 344 | { |
e671cd59 PA |
345 | /* If we resume more than one inferior in the foreground on GDB's |
346 | terminal, then the first inferior's terminal settings "win". | |
347 | Note that every child process is put in its own process group, so | |
348 | the first process that ends up resumed ends up determining which | |
349 | process group the kernel forwards Ctrl-C/Ctrl-Z (SIGINT/SIGTTOU) | |
350 | to. */ | |
351 | if (gdb_tty_state == target_terminal_state::is_inferior) | |
7e1789f5 PA |
352 | return; |
353 | ||
e671cd59 PA |
354 | inferior *inf = current_inferior (); |
355 | terminal_info *tinfo = get_inflow_inferior_data (inf); | |
7e1789f5 PA |
356 | |
357 | if (gdb_has_a_terminal () | |
6c95b8df | 358 | && tinfo->ttystate != NULL |
e671cd59 | 359 | && sharing_input_terminal (inf)) |
c906108c SS |
360 | { |
361 | int result; | |
362 | ||
e671cd59 PA |
363 | /* Ignore SIGTTOU since it will happen when we try to set the |
364 | terminal's state (if gdb_tty_state is currently | |
365 | ours_for_output). */ | |
366 | scoped_ignore_sigttou ignore_sigttou; | |
367 | ||
c906108c | 368 | #ifdef F_GETFL |
6c95b8df | 369 | result = fcntl (0, F_SETFL, tinfo->tflags); |
c906108c SS |
370 | OOPSY ("fcntl F_SETFL"); |
371 | #endif | |
372 | ||
726e1356 | 373 | result = serial_set_tty_state (stdin_serial, tinfo->ttystate); |
c906108c SS |
374 | OOPSY ("setting tty state"); |
375 | ||
376 | if (!job_control) | |
377 | { | |
a40805d4 | 378 | sigint_ours = signal (SIGINT, SIG_IGN); |
c906108c | 379 | #ifdef SIGQUIT |
a40805d4 | 380 | sigquit_ours = signal (SIGQUIT, SIG_IGN); |
c906108c SS |
381 | #endif |
382 | } | |
383 | ||
c906108c SS |
384 | if (job_control) |
385 | { | |
726e1356 | 386 | #ifdef HAVE_TERMIOS_H |
e671cd59 PA |
387 | /* If we can't tell the inferior's actual process group, |
388 | then restore whatever was the foreground pgrp the last | |
389 | time the inferior was running. See also comments | |
390 | describing terminal_state::process_group. */ | |
391 | #ifdef HAVE_GETPGID | |
392 | result = tcsetpgrp (0, getpgid (inf->pid)); | |
393 | #else | |
6c95b8df | 394 | result = tcsetpgrp (0, tinfo->process_group); |
e671cd59 PA |
395 | #endif |
396 | if (result == -1) | |
397 | { | |
398 | #if 0 | |
399 | /* This fails if either GDB has no controlling terminal, | |
400 | e.g., running under 'setsid(1)', or if the inferior | |
401 | is not attached to GDB's controlling terminal. E.g., | |
402 | if it called setsid to create a new session or used | |
403 | the TIOCNOTTY ioctl, or simply if we've attached to a | |
404 | process running on another terminal and we couldn't | |
405 | tell whether it was sharing GDB's terminal (and so | |
406 | assumed yes). */ | |
407 | fprintf_unfiltered | |
408 | (gdb_stderr, | |
409 | "[tcsetpgrp failed in child_terminal_inferior: %s]\n", | |
410 | safe_strerror (errno)); | |
411 | #endif | |
412 | } | |
c906108c | 413 | #endif |
c906108c | 414 | } |
e671cd59 PA |
415 | |
416 | gdb_tty_state = target_terminal_state::is_inferior; | |
c906108c | 417 | } |
c906108c SS |
418 | } |
419 | ||
420 | /* Put some of our terminal settings into effect, | |
421 | enough to get proper results from our output, | |
422 | but do not change into or out of RAW mode | |
423 | so that no input is discarded. | |
424 | ||
425 | After doing this, either terminal_ours or terminal_inferior | |
4d4ca2a1 DE |
426 | should be called to get back to a normal state of affairs. |
427 | ||
428 | N.B. The implementation is (currently) no different than | |
429 | child_terminal_ours. See child_terminal_ours_1. */ | |
c906108c SS |
430 | |
431 | void | |
d6b64346 | 432 | child_terminal_ours_for_output (struct target_ops *self) |
c906108c | 433 | { |
e671cd59 | 434 | child_terminal_ours_1 (target_terminal_state::is_ours_for_output); |
c906108c SS |
435 | } |
436 | ||
437 | /* Put our terminal settings into effect. | |
438 | First record the inferior's terminal settings | |
4d4ca2a1 DE |
439 | so they can be restored properly later. |
440 | ||
441 | N.B. Targets that want to use this with async support must build that | |
442 | support on top of this (e.g., the caller still needs to add stdin to the | |
443 | event loop). E.g., see linux_nat_terminal_ours. */ | |
c906108c SS |
444 | |
445 | void | |
d6b64346 | 446 | child_terminal_ours (struct target_ops *self) |
c906108c | 447 | { |
e671cd59 | 448 | child_terminal_ours_1 (target_terminal_state::is_ours); |
c906108c SS |
449 | } |
450 | ||
e671cd59 PA |
451 | /* Save the current terminal settings in the inferior's terminal_info |
452 | cache. */ | |
c906108c | 453 | |
e671cd59 PA |
454 | void |
455 | child_terminal_save_inferior (struct target_ops *self) | |
c906108c | 456 | { |
e671cd59 PA |
457 | /* Avoid attempting all the ioctl's when running in batch. */ |
458 | if (!gdb_has_a_terminal ()) | |
459 | return; | |
7e1789f5 | 460 | |
e671cd59 PA |
461 | inferior *inf = current_inferior (); |
462 | terminal_info *tinfo = get_inflow_inferior_data (inf); | |
463 | ||
464 | /* No need to save/restore if the inferior is not sharing GDB's | |
465 | tty. */ | |
466 | if (!sharing_input_terminal (inf)) | |
7e1789f5 PA |
467 | return; |
468 | ||
e671cd59 PA |
469 | xfree (tinfo->ttystate); |
470 | tinfo->ttystate = serial_get_tty_state (stdin_serial); | |
d9d2d8b6 | 471 | |
f6cfb427 | 472 | #ifdef HAVE_TERMIOS_H |
e671cd59 | 473 | tinfo->process_group = tcgetpgrp (0); |
f6cfb427 | 474 | #endif |
7e1789f5 | 475 | |
e671cd59 PA |
476 | #ifdef F_GETFL |
477 | tinfo->tflags = fcntl (0, F_GETFL, 0); | |
478 | #endif | |
479 | } | |
480 | ||
481 | /* Switch terminal state to DESIRED_STATE, either is_ours, or | |
482 | is_ours_for_output. */ | |
7e1789f5 | 483 | |
e671cd59 PA |
484 | static void |
485 | child_terminal_ours_1 (target_terminal_state desired_state) | |
486 | { | |
487 | gdb_assert (desired_state != target_terminal_state::is_inferior); | |
488 | ||
489 | /* Avoid attempting all the ioctl's when running in batch. */ | |
490 | if (!gdb_has_a_terminal ()) | |
c906108c | 491 | return; |
e671cd59 PA |
492 | |
493 | if (gdb_tty_state != desired_state) | |
c906108c | 494 | { |
821fc4ae | 495 | int result ATTRIBUTE_UNUSED; |
c906108c | 496 | |
e2c33ac7 PA |
497 | /* Ignore SIGTTOU since it will happen when we try to set the |
498 | terminal's pgrp. */ | |
499 | scoped_ignore_sigttou ignore_sigttou; | |
c906108c | 500 | |
726e1356 PA |
501 | /* Set tty state to our_ttystate. */ |
502 | serial_set_tty_state (stdin_serial, our_terminal_info.ttystate); | |
c906108c | 503 | |
e671cd59 PA |
504 | /* If we only want output, then leave the inferior's pgrp in the |
505 | foreground, so that Ctrl-C/Ctrl-Z reach the inferior | |
506 | directly. */ | |
507 | if (job_control && desired_state == target_terminal_state::is_ours) | |
c906108c | 508 | { |
726e1356 | 509 | #ifdef HAVE_TERMIOS_H |
7e1789f5 | 510 | result = tcsetpgrp (0, our_terminal_info.process_group); |
c906108c SS |
511 | #if 0 |
512 | /* This fails on Ultrix with EINVAL if you run the testsuite | |
513 | in the background with nohup, and then log out. GDB never | |
514 | used to check for an error here, so perhaps there are other | |
515 | such situations as well. */ | |
516 | if (result == -1) | |
3e43a32a | 517 | fprintf_unfiltered (gdb_stderr, |
d6b64346 | 518 | "[tcsetpgrp failed in child_terminal_ours: %s]\n", |
dc672865 | 519 | safe_strerror (errno)); |
c906108c SS |
520 | #endif |
521 | #endif /* termios */ | |
c906108c SS |
522 | } |
523 | ||
e671cd59 | 524 | if (!job_control && desired_state == target_terminal_state::is_ours) |
c906108c SS |
525 | { |
526 | signal (SIGINT, sigint_ours); | |
527 | #ifdef SIGQUIT | |
528 | signal (SIGQUIT, sigquit_ours); | |
529 | #endif | |
530 | } | |
531 | ||
532 | #ifdef F_GETFL | |
7e1789f5 | 533 | result = fcntl (0, F_SETFL, our_terminal_info.tflags); |
c906108c | 534 | #endif |
e671cd59 PA |
535 | |
536 | gdb_tty_state = desired_state; | |
537 | } | |
538 | } | |
539 | ||
540 | /* Interrupt the inferior. Implementation of target_interrupt for | |
541 | child/native targets. */ | |
542 | ||
543 | void | |
544 | child_interrupt (struct target_ops *self) | |
545 | { | |
546 | /* Interrupt the first inferior that has a resumed thread. */ | |
547 | thread_info *thr; | |
548 | thread_info *resumed = NULL; | |
549 | ALL_NON_EXITED_THREADS (thr) | |
550 | { | |
551 | if (thr->executing) | |
552 | { | |
553 | resumed = thr; | |
554 | break; | |
555 | } | |
556 | if (thr->suspend.waitstatus_pending_p) | |
557 | resumed = thr; | |
558 | } | |
559 | ||
560 | if (resumed != NULL) | |
561 | { | |
562 | /* Note that unlike pressing Ctrl-C on the controlling terminal, | |
563 | here we only interrupt one process, not the whole process | |
564 | group. This is because interrupting a process group (with | |
565 | either Ctrl-C or with kill(3) with negative PID) sends a | |
566 | SIGINT to each process in the process group, and we may not | |
567 | be debugging all processes in the process group. */ | |
f6cfb427 | 568 | #ifndef _WIN32 |
e671cd59 | 569 | kill (resumed->inf->pid, SIGINT); |
f6cfb427 | 570 | #endif |
e671cd59 PA |
571 | } |
572 | } | |
573 | ||
574 | /* Pass a Ctrl-C to the inferior as-if a Ctrl-C was pressed while the | |
575 | inferior was in the foreground. Implementation of | |
576 | target_pass_ctrlc for child/native targets. */ | |
577 | ||
578 | void | |
579 | child_pass_ctrlc (struct target_ops *self) | |
580 | { | |
581 | gdb_assert (!target_terminal::is_ours ()); | |
582 | ||
583 | #ifdef HAVE_TERMIOS_H | |
584 | if (job_control) | |
585 | { | |
586 | pid_t term_pgrp = tcgetpgrp (0); | |
587 | ||
588 | /* If there's any inferior sharing our terminal, pass the SIGINT | |
589 | to the terminal's foreground process group. This acts just | |
590 | like the user typed a ^C on the terminal while the inferior | |
591 | was in the foreground. Note that using a negative process | |
592 | number in kill() is a System V-ism. The proper BSD interface | |
593 | is killpg(). However, all modern BSDs support the System V | |
594 | interface too. */ | |
595 | ||
596 | if (term_pgrp != -1 && term_pgrp != our_terminal_info.process_group) | |
597 | { | |
598 | kill (-term_pgrp, SIGINT); | |
599 | return; | |
600 | } | |
601 | } | |
602 | #endif | |
603 | ||
604 | /* Otherwise, pass the Ctrl-C to the first inferior that was resumed | |
605 | in the foreground. */ | |
606 | inferior *inf; | |
607 | ALL_INFERIORS (inf) | |
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 | ||
c906108c | 703 | void |
1d12d88f | 704 | info_terminal_command (const char *arg, int from_tty) |
c906108c | 705 | { |
223ffa71 | 706 | target_terminal::info (arg, from_tty); |
c906108c SS |
707 | } |
708 | ||
c906108c | 709 | void |
0a4f40a2 | 710 | child_terminal_info (struct target_ops *self, const char *args, int from_tty) |
c906108c | 711 | { |
7e1789f5 | 712 | struct inferior *inf; |
6c95b8df | 713 | struct terminal_info *tinfo; |
7e1789f5 | 714 | |
c906108c SS |
715 | if (!gdb_has_a_terminal ()) |
716 | { | |
a3f17187 | 717 | printf_filtered (_("This GDB does not control a terminal.\n")); |
c906108c SS |
718 | return; |
719 | } | |
720 | ||
7e1789f5 PA |
721 | if (ptid_equal (inferior_ptid, null_ptid)) |
722 | return; | |
723 | ||
724 | inf = current_inferior (); | |
6c95b8df | 725 | tinfo = get_inflow_inferior_data (inf); |
7e1789f5 | 726 | |
3e43a32a MS |
727 | printf_filtered (_("Inferior's terminal status " |
728 | "(currently saved by GDB):\n")); | |
c906108c SS |
729 | |
730 | /* First the fcntl flags. */ | |
731 | { | |
732 | int flags; | |
c5aa993b | 733 | |
6c95b8df | 734 | flags = tinfo->tflags; |
c906108c SS |
735 | |
736 | printf_filtered ("File descriptor flags = "); | |
737 | ||
738 | #ifndef O_ACCMODE | |
739 | #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) | |
740 | #endif | |
1777feb0 | 741 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug. */ |
c906108c SS |
742 | switch (flags & (O_ACCMODE)) |
743 | { | |
c5aa993b JM |
744 | case O_RDONLY: |
745 | printf_filtered ("O_RDONLY"); | |
746 | break; | |
747 | case O_WRONLY: | |
748 | printf_filtered ("O_WRONLY"); | |
749 | break; | |
750 | case O_RDWR: | |
751 | printf_filtered ("O_RDWR"); | |
752 | break; | |
c906108c SS |
753 | } |
754 | flags &= ~(O_ACCMODE); | |
755 | ||
756 | #ifdef O_NONBLOCK | |
c5aa993b | 757 | if (flags & O_NONBLOCK) |
c906108c SS |
758 | printf_filtered (" | O_NONBLOCK"); |
759 | flags &= ~O_NONBLOCK; | |
760 | #endif | |
c5aa993b | 761 | |
c906108c SS |
762 | #if defined (O_NDELAY) |
763 | /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will | |
764 | print it as O_NONBLOCK, which is good cause that is what POSIX | |
765 | has, and the flag will already be cleared by the time we get here. */ | |
766 | if (flags & O_NDELAY) | |
767 | printf_filtered (" | O_NDELAY"); | |
768 | flags &= ~O_NDELAY; | |
769 | #endif | |
770 | ||
771 | if (flags & O_APPEND) | |
772 | printf_filtered (" | O_APPEND"); | |
773 | flags &= ~O_APPEND; | |
774 | ||
775 | #if defined (O_BINARY) | |
776 | if (flags & O_BINARY) | |
777 | printf_filtered (" | O_BINARY"); | |
778 | flags &= ~O_BINARY; | |
779 | #endif | |
780 | ||
781 | if (flags) | |
782 | printf_filtered (" | 0x%x", flags); | |
783 | printf_filtered ("\n"); | |
784 | } | |
785 | ||
726e1356 | 786 | #ifdef HAVE_TERMIOS_H |
6c95b8df | 787 | printf_filtered ("Process group = %d\n", (int) tinfo->process_group); |
c906108c SS |
788 | #endif |
789 | ||
6c95b8df | 790 | serial_print_tty_state (stdin_serial, tinfo->ttystate, gdb_stdout); |
c906108c SS |
791 | } |
792 | \f | |
793 | /* NEW_TTY_PREFORK is called before forking a new child process, | |
794 | so we can record the state of ttys in the child to be formed. | |
795 | TTYNAME is null if we are to share the terminal with gdb; | |
796 | or points to a string containing the name of the desired tty. | |
797 | ||
798 | NEW_TTY is called in new child processes under Unix, which will | |
799 | become debugger target processes. This actually switches to | |
800 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
801 | ||
802 | void | |
3cb3b8df | 803 | new_tty_prefork (const char *ttyname) |
c906108c SS |
804 | { |
805 | /* Save the name for later, for determining whether we and the child | |
806 | are sharing a tty. */ | |
807 | inferior_thisrun_terminal = ttyname; | |
808 | } | |
809 | ||
e6d088ec | 810 | #if !defined(__GO32__) && !defined(_WIN32) |
bf1d7d9c JB |
811 | /* If RESULT, assumed to be the return value from a system call, is |
812 | negative, print the error message indicated by errno and exit. | |
813 | MSG should identify the operation that failed. */ | |
814 | static void | |
815 | check_syscall (const char *msg, int result) | |
816 | { | |
817 | if (result < 0) | |
818 | { | |
819 | print_sys_errmsg (msg, errno); | |
820 | _exit (1); | |
821 | } | |
822 | } | |
e6d088ec | 823 | #endif |
bf1d7d9c | 824 | |
c906108c | 825 | void |
fba45db2 | 826 | new_tty (void) |
c906108c | 827 | { |
52f0bd74 | 828 | int tty; |
c906108c SS |
829 | |
830 | if (inferior_thisrun_terminal == 0) | |
831 | return; | |
832 | #if !defined(__GO32__) && !defined(_WIN32) | |
833 | #ifdef TIOCNOTTY | |
834 | /* Disconnect the child process from our controlling terminal. On some | |
835 | systems (SVR4 for example), this may cause a SIGTTOU, so temporarily | |
1777feb0 | 836 | ignore SIGTTOU. */ |
c5aa993b | 837 | tty = open ("/dev/tty", O_RDWR); |
c906108c SS |
838 | if (tty > 0) |
839 | { | |
e2c33ac7 | 840 | scoped_ignore_sigttou ignore_sigttou; |
c906108c | 841 | |
c5aa993b JM |
842 | ioctl (tty, TIOCNOTTY, 0); |
843 | close (tty); | |
c906108c SS |
844 | } |
845 | #endif | |
846 | ||
847 | /* Now open the specified new terminal. */ | |
c5aa993b | 848 | tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
bf1d7d9c | 849 | check_syscall (inferior_thisrun_terminal, tty); |
c906108c SS |
850 | |
851 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
852 | if (tty != 0) | |
c5aa993b JM |
853 | { |
854 | close (0); | |
bf1d7d9c | 855 | check_syscall ("dup'ing tty into fd 0", dup (tty)); |
c5aa993b | 856 | } |
c906108c | 857 | if (tty != 1) |
c5aa993b JM |
858 | { |
859 | close (1); | |
bf1d7d9c | 860 | check_syscall ("dup'ing tty into fd 1", dup (tty)); |
c5aa993b | 861 | } |
c906108c | 862 | if (tty != 2) |
c5aa993b JM |
863 | { |
864 | close (2); | |
bf1d7d9c | 865 | check_syscall ("dup'ing tty into fd 2", dup (tty)); |
c5aa993b | 866 | } |
83116857 TJB |
867 | |
868 | #ifdef TIOCSCTTY | |
869 | /* Make tty our new controlling terminal. */ | |
870 | if (ioctl (tty, TIOCSCTTY, 0) == -1) | |
871 | /* Mention GDB in warning because it will appear in the inferior's | |
872 | terminal instead of GDB's. */ | |
a73c6dcd | 873 | warning (_("GDB: Failed to set controlling terminal: %s"), |
83116857 TJB |
874 | safe_strerror (errno)); |
875 | #endif | |
876 | ||
c906108c | 877 | if (tty > 2) |
c5aa993b JM |
878 | close (tty); |
879 | #endif /* !go32 && !win32 */ | |
c906108c | 880 | } |
191c4426 PA |
881 | |
882 | /* NEW_TTY_POSTFORK is called after forking a new child process, and | |
883 | adding it to the inferior table, to store the TTYNAME being used by | |
884 | the child, or null if it sharing the terminal with gdb. */ | |
885 | ||
886 | void | |
887 | new_tty_postfork (void) | |
888 | { | |
889 | /* Save the name for later, for determining whether we and the child | |
890 | are sharing a tty. */ | |
891 | ||
892 | if (inferior_thisrun_terminal) | |
6c95b8df PA |
893 | { |
894 | struct inferior *inf = current_inferior (); | |
895 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); | |
896 | ||
897 | tinfo->run_terminal = xstrdup (inferior_thisrun_terminal); | |
898 | } | |
191c4426 PA |
899 | |
900 | inferior_thisrun_terminal = NULL; | |
901 | } | |
902 | ||
c906108c SS |
903 | \f |
904 | /* Call set_sigint_trap when you need to pass a signal on to an attached | |
1777feb0 | 905 | process when handling SIGINT. */ |
c906108c | 906 | |
c906108c | 907 | static void |
fba45db2 | 908 | pass_signal (int signo) |
c906108c SS |
909 | { |
910 | #ifndef _WIN32 | |
dfd4cc63 | 911 | kill (ptid_get_pid (inferior_ptid), SIGINT); |
c906108c SS |
912 | #endif |
913 | } | |
914 | ||
a40805d4 | 915 | static sighandler_t osig; |
7e1789f5 | 916 | static int osig_set; |
c906108c SS |
917 | |
918 | void | |
fba45db2 | 919 | set_sigint_trap (void) |
c906108c | 920 | { |
181e7f93 | 921 | struct inferior *inf = current_inferior (); |
6c95b8df PA |
922 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); |
923 | ||
924 | if (inf->attach_flag || tinfo->run_terminal) | |
c906108c | 925 | { |
a40805d4 | 926 | osig = signal (SIGINT, pass_signal); |
7e1789f5 | 927 | osig_set = 1; |
c906108c | 928 | } |
7e1789f5 PA |
929 | else |
930 | osig_set = 0; | |
c906108c SS |
931 | } |
932 | ||
933 | void | |
fba45db2 | 934 | clear_sigint_trap (void) |
c906108c | 935 | { |
7e1789f5 | 936 | if (osig_set) |
c906108c SS |
937 | { |
938 | signal (SIGINT, osig); | |
7e1789f5 | 939 | osig_set = 0; |
c906108c SS |
940 | } |
941 | } | |
942 | \f | |
c906108c | 943 | |
83116857 TJB |
944 | /* Create a new session if the inferior will run in a different tty. |
945 | A session is UNIX's way of grouping processes that share a controlling | |
946 | terminal, so a new one is needed if the inferior terminal will be | |
947 | different from GDB's. | |
948 | ||
949 | Returns the session id of the new session, 0 if no session was created | |
950 | or -1 if an error occurred. */ | |
951 | pid_t | |
952 | create_tty_session (void) | |
953 | { | |
954 | #ifdef HAVE_SETSID | |
955 | pid_t ret; | |
956 | ||
957 | if (!job_control || inferior_thisrun_terminal == 0) | |
958 | return 0; | |
959 | ||
960 | ret = setsid (); | |
961 | if (ret == -1) | |
a73c6dcd | 962 | warning (_("Failed to create new terminal session: setsid: %s"), |
83116857 TJB |
963 | safe_strerror (errno)); |
964 | ||
965 | return ret; | |
966 | #else | |
967 | return 0; | |
968 | #endif /* HAVE_SETSID */ | |
969 | } | |
970 | ||
0ea3f30e DJ |
971 | /* Get all the current tty settings (including whether we have a |
972 | tty at all!). We can't do this in _initialize_inflow because | |
973 | serial_fdopen() won't work until the serial_ops_list is | |
974 | initialized, but we don't want to do it lazily either, so | |
975 | that we can guarantee stdin_serial is opened if there is | |
976 | a terminal. */ | |
977 | void | |
978 | initialize_stdin_serial (void) | |
979 | { | |
980 | stdin_serial = serial_fdopen (0); | |
981 | } | |
982 | ||
c906108c | 983 | void |
fba45db2 | 984 | _initialize_inflow (void) |
c906108c | 985 | { |
11db9430 | 986 | add_info ("terminal", info_terminal_command, |
1bedd215 | 987 | _("Print inferior's saved terminal status.")); |
c906108c | 988 | |
15652511 SDJ |
989 | /* OK, figure out whether we have job control. */ |
990 | have_job_control (); | |
7e1789f5 | 991 | |
76727919 | 992 | gdb::observers::inferior_exit.attach (inflow_inferior_exit); |
6c95b8df PA |
993 | |
994 | inflow_inferior_data | |
8e260fc0 | 995 | = register_inferior_data_with_cleanup (NULL, inflow_inferior_data_cleanup); |
c906108c | 996 | } |