Commit | Line | Data |
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c906108c | 1 | /* Low level interface to ptrace, for GDB when running under Unix. |
ecd75fc8 | 2 | Copyright (C) 1986-2014 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 | 28 | |
0e9f083f | 29 | #include <string.h> |
c906108c SS |
30 | #include <signal.h> |
31 | #include <fcntl.h> | |
0ea3f30e | 32 | #include "gdb_select.h" |
c906108c | 33 | |
44270758 | 34 | #include "inflow.h" |
7bfc9434 | 35 | #include "gdbcmd.h" |
c906108c | 36 | |
c2d11a7d JM |
37 | #ifdef HAVE_SYS_IOCTL_H |
38 | #include <sys/ioctl.h> | |
39 | #endif | |
40 | ||
f2acbe1c MK |
41 | #ifndef O_NOCTTY |
42 | #define O_NOCTTY 0 | |
43 | #endif | |
44 | ||
a14ed312 | 45 | extern void _initialize_inflow (void); |
392a587b | 46 | |
a14ed312 | 47 | static void pass_signal (int); |
c906108c | 48 | |
d6b64346 | 49 | static void child_terminal_ours_1 (int); |
c906108c SS |
50 | \f |
51 | /* Record terminal status separately for debugger and inferior. */ | |
52 | ||
819cc324 | 53 | static struct serial *stdin_serial; |
c906108c | 54 | |
7e1789f5 PA |
55 | /* Terminal related info we need to keep track of. Each inferior |
56 | holds an instance of this structure --- we save it whenever the | |
57 | corresponding inferior stops, and restore it to the foreground | |
58 | inferior when it resumes. */ | |
59 | struct terminal_info | |
60 | { | |
61 | /* The name of the tty (from the `tty' command) that we gave to the | |
62 | inferior when it was started. */ | |
191c4426 | 63 | char *run_terminal; |
7e1789f5 PA |
64 | |
65 | /* TTY state. We save it whenever the inferior stops, and restore | |
66 | it when it resumes. */ | |
67 | serial_ttystate ttystate; | |
68 | ||
69 | #ifdef PROCESS_GROUP_TYPE | |
70 | /* Process group. Saved and restored just like ttystate. */ | |
71 | PROCESS_GROUP_TYPE process_group; | |
72 | #endif | |
c906108c | 73 | |
7e1789f5 PA |
74 | /* fcntl flags. Saved and restored just like ttystate. */ |
75 | int tflags; | |
76 | }; | |
c906108c | 77 | |
7e1789f5 PA |
78 | /* Our own tty state, which we restore every time we need to deal with |
79 | the terminal. This is only set once, when GDB first starts. The | |
80 | settings of flags which readline saves and restores and | |
81 | unimportant. */ | |
82 | static struct terminal_info our_terminal_info; | |
c906108c | 83 | |
6c95b8df PA |
84 | static struct terminal_info *get_inflow_inferior_data (struct inferior *); |
85 | ||
c906108c | 86 | #ifdef PROCESS_GROUP_TYPE |
7e1789f5 PA |
87 | |
88 | /* Return the process group of the current inferior. */ | |
89 | ||
90 | PROCESS_GROUP_TYPE | |
91 | inferior_process_group (void) | |
92 | { | |
6c95b8df | 93 | return get_inflow_inferior_data (current_inferior ())->process_group; |
7e1789f5 | 94 | } |
c906108c SS |
95 | #endif |
96 | ||
97 | /* While the inferior is running, we want SIGINT and SIGQUIT to go to the | |
98 | inferior only. If we have job control, that takes care of it. If not, | |
99 | we save our handlers in these two variables and set SIGINT and SIGQUIT | |
100 | to SIG_IGN. */ | |
101 | ||
102 | static void (*sigint_ours) (); | |
103 | static void (*sigquit_ours) (); | |
104 | ||
7e1789f5 PA |
105 | /* The name of the tty (from the `tty' command) that we're giving to |
106 | the inferior when starting it up. This is only (and should only | |
191c4426 PA |
107 | be) used as a transient global by new_tty_prefork, |
108 | create_tty_session, new_tty and new_tty_postfork, all called from | |
109 | fork_inferior, while forking a new child. */ | |
3cb3b8df | 110 | static const char *inferior_thisrun_terminal; |
c906108c SS |
111 | |
112 | /* Nonzero if our terminal settings are in effect. Zero if the | |
113 | inferior's settings are in effect. Ignored if !gdb_has_a_terminal | |
114 | (). */ | |
115 | ||
116 | int terminal_is_ours; | |
117 | ||
64a0ac84 PA |
118 | #ifdef PROCESS_GROUP_TYPE |
119 | static PROCESS_GROUP_TYPE | |
120 | gdb_getpgrp (void) | |
121 | { | |
122 | int process_group = -1; | |
abbb1732 | 123 | |
64a0ac84 PA |
124 | #ifdef HAVE_TERMIOS |
125 | process_group = tcgetpgrp (0); | |
126 | #endif | |
127 | #ifdef HAVE_TERMIO | |
128 | process_group = getpgrp (); | |
129 | #endif | |
130 | #ifdef HAVE_SGTTY | |
131 | ioctl (0, TIOCGPGRP, &process_group); | |
132 | #endif | |
133 | return process_group; | |
134 | } | |
135 | #endif | |
136 | ||
c5aa993b JM |
137 | enum |
138 | { | |
139 | yes, no, have_not_checked | |
140 | } | |
141 | gdb_has_a_terminal_flag = have_not_checked; | |
c906108c | 142 | |
7bfc9434 JB |
143 | /* The value of the "interactive-mode" setting. */ |
144 | static enum auto_boolean interactive_mode = AUTO_BOOLEAN_AUTO; | |
145 | ||
146 | /* Implement the "show interactive-mode" option. */ | |
147 | ||
148 | static void | |
149 | show_interactive_mode (struct ui_file *file, int from_tty, | |
150 | struct cmd_list_element *c, | |
151 | const char *value) | |
152 | { | |
153 | if (interactive_mode == AUTO_BOOLEAN_AUTO) | |
154 | fprintf_filtered (file, "Debugger's interactive mode " | |
155 | "is %s (currently %s).\n", | |
156 | value, gdb_has_a_terminal () ? "on" : "off"); | |
157 | else | |
158 | fprintf_filtered (file, "Debugger's interactive mode is %s.\n", value); | |
159 | } | |
160 | ||
c906108c SS |
161 | /* Does GDB have a terminal (on stdin)? */ |
162 | int | |
fba45db2 | 163 | gdb_has_a_terminal (void) |
c906108c | 164 | { |
7bfc9434 | 165 | if (interactive_mode != AUTO_BOOLEAN_AUTO) |
6b0c4c1f | 166 | return interactive_mode == AUTO_BOOLEAN_TRUE; |
7bfc9434 | 167 | |
c906108c SS |
168 | switch (gdb_has_a_terminal_flag) |
169 | { | |
170 | case yes: | |
171 | return 1; | |
172 | case no: | |
173 | return 0; | |
174 | case have_not_checked: | |
2cd58942 AC |
175 | /* Get all the current tty settings (including whether we have a |
176 | tty at all!). Can't do this in _initialize_inflow because | |
177 | serial_fdopen() won't work until the serial_ops_list is | |
178 | initialized. */ | |
c906108c SS |
179 | |
180 | #ifdef F_GETFL | |
7e1789f5 | 181 | our_terminal_info.tflags = fcntl (0, F_GETFL, 0); |
c906108c SS |
182 | #endif |
183 | ||
184 | gdb_has_a_terminal_flag = no; | |
c906108c SS |
185 | if (stdin_serial != NULL) |
186 | { | |
7e1789f5 | 187 | our_terminal_info.ttystate = serial_get_tty_state (stdin_serial); |
c906108c | 188 | |
7e1789f5 | 189 | if (our_terminal_info.ttystate != NULL) |
c906108c SS |
190 | { |
191 | gdb_has_a_terminal_flag = yes; | |
807bddf3 | 192 | #ifdef PROCESS_GROUP_TYPE |
7e1789f5 | 193 | our_terminal_info.process_group = gdb_getpgrp (); |
807bddf3 | 194 | #endif |
c906108c SS |
195 | } |
196 | } | |
197 | ||
198 | return gdb_has_a_terminal_flag == yes; | |
199 | default: | |
200 | /* "Can't happen". */ | |
201 | return 0; | |
202 | } | |
203 | } | |
204 | ||
205 | /* Macro for printing errors from ioctl operations */ | |
206 | ||
207 | #define OOPSY(what) \ | |
208 | if (result == -1) \ | |
209 | fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ | |
dc672865 | 210 | what, safe_strerror (errno)) |
c906108c | 211 | |
c906108c SS |
212 | /* Initialize the terminal settings we record for the inferior, |
213 | before we actually run the inferior. */ | |
214 | ||
215 | void | |
d6b64346 | 216 | child_terminal_init_with_pgrp (int pgrp) |
c906108c | 217 | { |
6f64ef53 PA |
218 | struct inferior *inf = current_inferior (); |
219 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); | |
220 | ||
221 | #ifdef PROCESS_GROUP_TYPE | |
222 | /* Store the process group even without a terminal as it is used not | |
223 | only to reset the tty foreground process group, but also to | |
224 | interrupt the inferior. */ | |
225 | tinfo->process_group = pgrp; | |
226 | #endif | |
227 | ||
c906108c SS |
228 | if (gdb_has_a_terminal ()) |
229 | { | |
6c95b8df | 230 | xfree (tinfo->ttystate); |
1e182ce8 UW |
231 | tinfo->ttystate = serial_copy_tty_state (stdin_serial, |
232 | our_terminal_info.ttystate); | |
c906108c | 233 | |
c906108c | 234 | /* Make sure that next time we call terminal_inferior (which will be |
c5aa993b JM |
235 | before the program runs, as it needs to be), we install the new |
236 | process group. */ | |
c906108c SS |
237 | terminal_is_ours = 1; |
238 | } | |
239 | } | |
240 | ||
a790ad35 SC |
241 | /* Save the terminal settings again. This is necessary for the TUI |
242 | when it switches to TUI or non-TUI mode; curses changes the terminal | |
243 | and gdb must be able to restore it correctly. */ | |
244 | ||
245 | void | |
d6b64346 | 246 | child_terminal_save_ours (struct target_ops *self) |
a790ad35 SC |
247 | { |
248 | if (gdb_has_a_terminal ()) | |
249 | { | |
7e1789f5 PA |
250 | xfree (our_terminal_info.ttystate); |
251 | our_terminal_info.ttystate = serial_get_tty_state (stdin_serial); | |
a790ad35 SC |
252 | } |
253 | } | |
254 | ||
c906108c | 255 | void |
d6b64346 | 256 | child_terminal_init (struct target_ops *self) |
c906108c SS |
257 | { |
258 | #ifdef PROCESS_GROUP_TYPE | |
d6b64346 PA |
259 | /* This is for Lynx, and should be cleaned up by having Lynx be a |
260 | separate debugging target with a version of target_terminal_init | |
261 | which passes in the process group to a generic routine which does | |
262 | all the work (and the non-threaded child_terminal_init can just | |
263 | pass in inferior_ptid to the same routine). */ | |
c906108c | 264 | /* We assume INFERIOR_PID is also the child's process group. */ |
d6b64346 | 265 | child_terminal_init_with_pgrp (ptid_get_pid (inferior_ptid)); |
c906108c SS |
266 | #endif /* PROCESS_GROUP_TYPE */ |
267 | } | |
268 | ||
269 | /* Put the inferior's terminal settings into effect. | |
4d4ca2a1 DE |
270 | This is preparation for starting or resuming the inferior. |
271 | ||
272 | N.B. Targets that want to use this with async support must build that | |
273 | support on top of this (e.g., the caller still needs to remove stdin | |
274 | from the event loop). E.g., see linux_nat_terminal_inferior. */ | |
c906108c SS |
275 | |
276 | void | |
d6b64346 | 277 | child_terminal_inferior (struct target_ops *self) |
c906108c | 278 | { |
7e1789f5 | 279 | struct inferior *inf; |
6c95b8df | 280 | struct terminal_info *tinfo; |
7e1789f5 PA |
281 | |
282 | if (!terminal_is_ours) | |
283 | return; | |
284 | ||
285 | inf = current_inferior (); | |
6c95b8df | 286 | tinfo = get_inflow_inferior_data (inf); |
7e1789f5 PA |
287 | |
288 | if (gdb_has_a_terminal () | |
6c95b8df PA |
289 | && tinfo->ttystate != NULL |
290 | && tinfo->run_terminal == NULL) | |
c906108c SS |
291 | { |
292 | int result; | |
293 | ||
294 | #ifdef F_GETFL | |
295 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
296 | places we use F_SETFL, so I'm inclined to think perhaps there |
297 | is some reason, however perverse. Perhaps not though... */ | |
6c95b8df PA |
298 | result = fcntl (0, F_SETFL, tinfo->tflags); |
299 | result = fcntl (0, F_SETFL, tinfo->tflags); | |
c906108c SS |
300 | OOPSY ("fcntl F_SETFL"); |
301 | #endif | |
302 | ||
303 | /* Because we were careful to not change in or out of raw mode in | |
c5aa993b JM |
304 | terminal_ours, we will not change in our out of raw mode with |
305 | this call, so we don't flush any input. */ | |
7e1789f5 | 306 | result = serial_set_tty_state (stdin_serial, |
6c95b8df | 307 | tinfo->ttystate); |
c906108c SS |
308 | OOPSY ("setting tty state"); |
309 | ||
310 | if (!job_control) | |
311 | { | |
c5aa993b | 312 | sigint_ours = (void (*)()) signal (SIGINT, SIG_IGN); |
c906108c | 313 | #ifdef SIGQUIT |
c5aa993b | 314 | sigquit_ours = (void (*)()) signal (SIGQUIT, SIG_IGN); |
c906108c SS |
315 | #endif |
316 | } | |
317 | ||
318 | /* If attach_flag is set, we don't know whether we are sharing a | |
c5aa993b JM |
319 | terminal with the inferior or not. (attaching a process |
320 | without a terminal is one case where we do not; attaching a | |
321 | process which we ran from the same shell as GDB via `&' is | |
322 | one case where we do, I think (but perhaps this is not | |
323 | `sharing' in the sense that we need to save and restore tty | |
324 | state)). I don't know if there is any way to tell whether we | |
325 | are sharing a terminal. So what we do is to go through all | |
326 | the saving and restoring of the tty state, but ignore errors | |
327 | setting the process group, which will happen if we are not | |
328 | sharing a terminal). */ | |
c906108c SS |
329 | |
330 | if (job_control) | |
331 | { | |
332 | #ifdef HAVE_TERMIOS | |
6c95b8df | 333 | result = tcsetpgrp (0, tinfo->process_group); |
181e7f93 | 334 | if (!inf->attach_flag) |
c906108c SS |
335 | OOPSY ("tcsetpgrp"); |
336 | #endif | |
337 | ||
338 | #ifdef HAVE_SGTTY | |
6c95b8df | 339 | result = ioctl (0, TIOCSPGRP, &tinfo->process_group); |
181e7f93 | 340 | if (!inf->attach_flag) |
c906108c SS |
341 | OOPSY ("TIOCSPGRP"); |
342 | #endif | |
343 | } | |
344 | ||
345 | } | |
346 | terminal_is_ours = 0; | |
347 | } | |
348 | ||
349 | /* Put some of our terminal settings into effect, | |
350 | enough to get proper results from our output, | |
351 | but do not change into or out of RAW mode | |
352 | so that no input is discarded. | |
353 | ||
354 | After doing this, either terminal_ours or terminal_inferior | |
4d4ca2a1 DE |
355 | should be called to get back to a normal state of affairs. |
356 | ||
357 | N.B. The implementation is (currently) no different than | |
358 | child_terminal_ours. See child_terminal_ours_1. */ | |
c906108c SS |
359 | |
360 | void | |
d6b64346 | 361 | child_terminal_ours_for_output (struct target_ops *self) |
c906108c | 362 | { |
d6b64346 | 363 | child_terminal_ours_1 (1); |
c906108c SS |
364 | } |
365 | ||
366 | /* Put our terminal settings into effect. | |
367 | First record the inferior's terminal settings | |
4d4ca2a1 DE |
368 | so they can be restored properly later. |
369 | ||
370 | N.B. Targets that want to use this with async support must build that | |
371 | support on top of this (e.g., the caller still needs to add stdin to the | |
372 | event loop). E.g., see linux_nat_terminal_ours. */ | |
c906108c SS |
373 | |
374 | void | |
d6b64346 | 375 | child_terminal_ours (struct target_ops *self) |
c906108c | 376 | { |
d6b64346 | 377 | child_terminal_ours_1 (0); |
c906108c SS |
378 | } |
379 | ||
380 | /* output_only is not used, and should not be used unless we introduce | |
381 | separate terminal_is_ours and terminal_is_ours_for_output | |
382 | flags. */ | |
383 | ||
384 | static void | |
d6b64346 | 385 | child_terminal_ours_1 (int output_only) |
c906108c | 386 | { |
7e1789f5 | 387 | struct inferior *inf; |
6c95b8df | 388 | struct terminal_info *tinfo; |
7e1789f5 PA |
389 | |
390 | if (terminal_is_ours) | |
391 | return; | |
392 | ||
d9d2d8b6 PA |
393 | terminal_is_ours = 1; |
394 | ||
7e1789f5 | 395 | /* Checking inferior->run_terminal is necessary so that |
c906108c SS |
396 | if GDB is running in the background, it won't block trying |
397 | to do the ioctl()'s below. Checking gdb_has_a_terminal | |
398 | avoids attempting all the ioctl's when running in batch. */ | |
7e1789f5 PA |
399 | |
400 | inf = current_inferior (); | |
6c95b8df | 401 | tinfo = get_inflow_inferior_data (inf); |
7e1789f5 | 402 | |
6c95b8df | 403 | if (tinfo->run_terminal != NULL || gdb_has_a_terminal () == 0) |
c906108c SS |
404 | return; |
405 | ||
c906108c | 406 | { |
4b69c284 | 407 | #ifdef SIGTTOU |
c906108c | 408 | /* Ignore this signal since it will happen when we try to set the |
c5aa993b | 409 | pgrp. */ |
4b69c284 AC |
410 | void (*osigttou) () = NULL; |
411 | #endif | |
c906108c SS |
412 | int result; |
413 | ||
c906108c SS |
414 | #ifdef SIGTTOU |
415 | if (job_control) | |
c5aa993b | 416 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
c906108c SS |
417 | #endif |
418 | ||
6c95b8df PA |
419 | xfree (tinfo->ttystate); |
420 | tinfo->ttystate = serial_get_tty_state (stdin_serial); | |
64a0ac84 | 421 | |
49a834f9 | 422 | #ifdef PROCESS_GROUP_TYPE |
181e7f93 | 423 | if (!inf->attach_flag) |
64a0ac84 PA |
424 | /* If setpgrp failed in terminal_inferior, this would give us |
425 | our process group instead of the inferior's. See | |
426 | terminal_inferior for details. */ | |
6c95b8df | 427 | tinfo->process_group = gdb_getpgrp (); |
49a834f9 | 428 | #endif |
c906108c SS |
429 | |
430 | /* Here we used to set ICANON in our ttystate, but I believe this | |
c5aa993b JM |
431 | was an artifact from before when we used readline. Readline sets |
432 | the tty state when it needs to. | |
433 | FIXME-maybe: However, query() expects non-raw mode and doesn't | |
434 | use readline. Maybe query should use readline (on the other hand, | |
435 | this only matters for HAVE_SGTTY, not termio or termios, I think). */ | |
c906108c SS |
436 | |
437 | /* Set tty state to our_ttystate. We don't change in our out of raw | |
c5aa993b JM |
438 | mode, to avoid flushing input. We need to do the same thing |
439 | regardless of output_only, because we don't have separate | |
440 | terminal_is_ours and terminal_is_ours_for_output flags. It's OK, | |
1777feb0 MS |
441 | though, since readline will deal with raw mode when/if it needs |
442 | to. */ | |
c906108c | 443 | |
7e1789f5 | 444 | serial_noflush_set_tty_state (stdin_serial, our_terminal_info.ttystate, |
6c95b8df | 445 | tinfo->ttystate); |
c906108c SS |
446 | |
447 | if (job_control) | |
448 | { | |
449 | #ifdef HAVE_TERMIOS | |
7e1789f5 | 450 | result = tcsetpgrp (0, our_terminal_info.process_group); |
c906108c SS |
451 | #if 0 |
452 | /* This fails on Ultrix with EINVAL if you run the testsuite | |
453 | in the background with nohup, and then log out. GDB never | |
454 | used to check for an error here, so perhaps there are other | |
455 | such situations as well. */ | |
456 | if (result == -1) | |
3e43a32a | 457 | fprintf_unfiltered (gdb_stderr, |
d6b64346 | 458 | "[tcsetpgrp failed in child_terminal_ours: %s]\n", |
dc672865 | 459 | safe_strerror (errno)); |
c906108c SS |
460 | #endif |
461 | #endif /* termios */ | |
462 | ||
463 | #ifdef HAVE_SGTTY | |
7e1789f5 | 464 | result = ioctl (0, TIOCSPGRP, &our_terminal_info.process_group); |
c906108c SS |
465 | #endif |
466 | } | |
467 | ||
468 | #ifdef SIGTTOU | |
469 | if (job_control) | |
470 | signal (SIGTTOU, osigttou); | |
471 | #endif | |
472 | ||
473 | if (!job_control) | |
474 | { | |
475 | signal (SIGINT, sigint_ours); | |
476 | #ifdef SIGQUIT | |
477 | signal (SIGQUIT, sigquit_ours); | |
478 | #endif | |
479 | } | |
480 | ||
481 | #ifdef F_GETFL | |
6c95b8df | 482 | tinfo->tflags = fcntl (0, F_GETFL, 0); |
c906108c SS |
483 | |
484 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
485 | places we use F_SETFL, so I'm inclined to think perhaps there |
486 | is some reason, however perverse. Perhaps not though... */ | |
7e1789f5 PA |
487 | result = fcntl (0, F_SETFL, our_terminal_info.tflags); |
488 | result = fcntl (0, F_SETFL, our_terminal_info.tflags); | |
c906108c | 489 | #endif |
c906108c SS |
490 | } |
491 | } | |
492 | ||
6c95b8df PA |
493 | /* Per-inferior data key. */ |
494 | static const struct inferior_data *inflow_inferior_data; | |
7e1789f5 PA |
495 | |
496 | static void | |
6c95b8df | 497 | inflow_inferior_data_cleanup (struct inferior *inf, void *arg) |
7e1789f5 | 498 | { |
487ad57c | 499 | struct terminal_info *info = arg; |
6c95b8df | 500 | |
487ad57c YQ |
501 | xfree (info->run_terminal); |
502 | xfree (info->ttystate); | |
503 | xfree (info); | |
6c95b8df PA |
504 | } |
505 | ||
506 | /* Get the current svr4 data. If none is found yet, add it now. This | |
507 | function always returns a valid object. */ | |
508 | ||
509 | static struct terminal_info * | |
510 | get_inflow_inferior_data (struct inferior *inf) | |
511 | { | |
512 | struct terminal_info *info; | |
513 | ||
514 | info = inferior_data (inf, inflow_inferior_data); | |
515 | if (info == NULL) | |
516 | { | |
41bf6aca | 517 | info = XCNEW (struct terminal_info); |
6c95b8df PA |
518 | set_inferior_data (inf, inflow_inferior_data, info); |
519 | } | |
7e1789f5 | 520 | |
6c95b8df | 521 | return info; |
7e1789f5 PA |
522 | } |
523 | ||
524 | /* This is a "inferior_exit" observer. Releases the TERMINAL_INFO member | |
525 | of the inferior structure. This field is private to inflow.c, and | |
526 | its type is opaque to the rest of GDB. PID is the target pid of | |
527 | the inferior that is about to be removed from the inferior | |
528 | list. */ | |
529 | ||
530 | static void | |
a79b8f6e | 531 | inflow_inferior_exit (struct inferior *inf) |
7e1789f5 | 532 | { |
6c95b8df | 533 | struct terminal_info *info; |
7e1789f5 | 534 | |
6c95b8df PA |
535 | info = inferior_data (inf, inflow_inferior_data); |
536 | if (info != NULL) | |
537 | { | |
538 | xfree (info->run_terminal); | |
1e182ce8 | 539 | xfree (info->ttystate); |
6c95b8df PA |
540 | xfree (info); |
541 | set_inferior_data (inf, inflow_inferior_data, NULL); | |
542 | } | |
7e1789f5 PA |
543 | } |
544 | ||
191c4426 PA |
545 | void |
546 | copy_terminal_info (struct inferior *to, struct inferior *from) | |
547 | { | |
6c95b8df PA |
548 | struct terminal_info *tinfo_to, *tinfo_from; |
549 | ||
550 | tinfo_to = get_inflow_inferior_data (to); | |
551 | tinfo_from = get_inflow_inferior_data (from); | |
1e182ce8 UW |
552 | |
553 | xfree (tinfo_to->run_terminal); | |
554 | xfree (tinfo_to->ttystate); | |
555 | ||
6c95b8df | 556 | *tinfo_to = *tinfo_from; |
1e182ce8 | 557 | |
6c95b8df PA |
558 | if (tinfo_from->run_terminal) |
559 | tinfo_to->run_terminal | |
560 | = xstrdup (tinfo_from->run_terminal); | |
1e182ce8 UW |
561 | |
562 | if (tinfo_from->ttystate) | |
563 | tinfo_to->ttystate | |
564 | = serial_copy_tty_state (stdin_serial, tinfo_from->ttystate); | |
191c4426 PA |
565 | } |
566 | ||
c906108c | 567 | void |
fba45db2 | 568 | term_info (char *arg, int from_tty) |
c906108c SS |
569 | { |
570 | target_terminal_info (arg, from_tty); | |
571 | } | |
572 | ||
c906108c | 573 | void |
0a4f40a2 | 574 | child_terminal_info (struct target_ops *self, const char *args, int from_tty) |
c906108c | 575 | { |
7e1789f5 | 576 | struct inferior *inf; |
6c95b8df | 577 | struct terminal_info *tinfo; |
7e1789f5 | 578 | |
c906108c SS |
579 | if (!gdb_has_a_terminal ()) |
580 | { | |
a3f17187 | 581 | printf_filtered (_("This GDB does not control a terminal.\n")); |
c906108c SS |
582 | return; |
583 | } | |
584 | ||
7e1789f5 PA |
585 | if (ptid_equal (inferior_ptid, null_ptid)) |
586 | return; | |
587 | ||
588 | inf = current_inferior (); | |
6c95b8df | 589 | tinfo = get_inflow_inferior_data (inf); |
7e1789f5 | 590 | |
3e43a32a MS |
591 | printf_filtered (_("Inferior's terminal status " |
592 | "(currently saved by GDB):\n")); | |
c906108c SS |
593 | |
594 | /* First the fcntl flags. */ | |
595 | { | |
596 | int flags; | |
c5aa993b | 597 | |
6c95b8df | 598 | flags = tinfo->tflags; |
c906108c SS |
599 | |
600 | printf_filtered ("File descriptor flags = "); | |
601 | ||
602 | #ifndef O_ACCMODE | |
603 | #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) | |
604 | #endif | |
1777feb0 | 605 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug. */ |
c906108c SS |
606 | switch (flags & (O_ACCMODE)) |
607 | { | |
c5aa993b JM |
608 | case O_RDONLY: |
609 | printf_filtered ("O_RDONLY"); | |
610 | break; | |
611 | case O_WRONLY: | |
612 | printf_filtered ("O_WRONLY"); | |
613 | break; | |
614 | case O_RDWR: | |
615 | printf_filtered ("O_RDWR"); | |
616 | break; | |
c906108c SS |
617 | } |
618 | flags &= ~(O_ACCMODE); | |
619 | ||
620 | #ifdef O_NONBLOCK | |
c5aa993b | 621 | if (flags & O_NONBLOCK) |
c906108c SS |
622 | printf_filtered (" | O_NONBLOCK"); |
623 | flags &= ~O_NONBLOCK; | |
624 | #endif | |
c5aa993b | 625 | |
c906108c SS |
626 | #if defined (O_NDELAY) |
627 | /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will | |
628 | print it as O_NONBLOCK, which is good cause that is what POSIX | |
629 | has, and the flag will already be cleared by the time we get here. */ | |
630 | if (flags & O_NDELAY) | |
631 | printf_filtered (" | O_NDELAY"); | |
632 | flags &= ~O_NDELAY; | |
633 | #endif | |
634 | ||
635 | if (flags & O_APPEND) | |
636 | printf_filtered (" | O_APPEND"); | |
637 | flags &= ~O_APPEND; | |
638 | ||
639 | #if defined (O_BINARY) | |
640 | if (flags & O_BINARY) | |
641 | printf_filtered (" | O_BINARY"); | |
642 | flags &= ~O_BINARY; | |
643 | #endif | |
644 | ||
645 | if (flags) | |
646 | printf_filtered (" | 0x%x", flags); | |
647 | printf_filtered ("\n"); | |
648 | } | |
649 | ||
650 | #ifdef PROCESS_GROUP_TYPE | |
6c95b8df | 651 | printf_filtered ("Process group = %d\n", (int) tinfo->process_group); |
c906108c SS |
652 | #endif |
653 | ||
6c95b8df | 654 | serial_print_tty_state (stdin_serial, tinfo->ttystate, gdb_stdout); |
c906108c SS |
655 | } |
656 | \f | |
657 | /* NEW_TTY_PREFORK is called before forking a new child process, | |
658 | so we can record the state of ttys in the child to be formed. | |
659 | TTYNAME is null if we are to share the terminal with gdb; | |
660 | or points to a string containing the name of the desired tty. | |
661 | ||
662 | NEW_TTY is called in new child processes under Unix, which will | |
663 | become debugger target processes. This actually switches to | |
664 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
665 | ||
666 | void | |
3cb3b8df | 667 | new_tty_prefork (const char *ttyname) |
c906108c SS |
668 | { |
669 | /* Save the name for later, for determining whether we and the child | |
670 | are sharing a tty. */ | |
671 | inferior_thisrun_terminal = ttyname; | |
672 | } | |
673 | ||
e6d088ec | 674 | #if !defined(__GO32__) && !defined(_WIN32) |
bf1d7d9c JB |
675 | /* If RESULT, assumed to be the return value from a system call, is |
676 | negative, print the error message indicated by errno and exit. | |
677 | MSG should identify the operation that failed. */ | |
678 | static void | |
679 | check_syscall (const char *msg, int result) | |
680 | { | |
681 | if (result < 0) | |
682 | { | |
683 | print_sys_errmsg (msg, errno); | |
684 | _exit (1); | |
685 | } | |
686 | } | |
e6d088ec | 687 | #endif |
bf1d7d9c | 688 | |
c906108c | 689 | void |
fba45db2 | 690 | new_tty (void) |
c906108c | 691 | { |
52f0bd74 | 692 | int tty; |
c906108c SS |
693 | |
694 | if (inferior_thisrun_terminal == 0) | |
695 | return; | |
696 | #if !defined(__GO32__) && !defined(_WIN32) | |
697 | #ifdef TIOCNOTTY | |
698 | /* Disconnect the child process from our controlling terminal. On some | |
699 | systems (SVR4 for example), this may cause a SIGTTOU, so temporarily | |
1777feb0 | 700 | ignore SIGTTOU. */ |
c5aa993b | 701 | tty = open ("/dev/tty", O_RDWR); |
c906108c SS |
702 | if (tty > 0) |
703 | { | |
704 | void (*osigttou) (); | |
705 | ||
c5aa993b JM |
706 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
707 | ioctl (tty, TIOCNOTTY, 0); | |
708 | close (tty); | |
709 | signal (SIGTTOU, osigttou); | |
c906108c SS |
710 | } |
711 | #endif | |
712 | ||
713 | /* Now open the specified new terminal. */ | |
c5aa993b | 714 | tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
bf1d7d9c | 715 | check_syscall (inferior_thisrun_terminal, tty); |
c906108c SS |
716 | |
717 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
718 | if (tty != 0) | |
c5aa993b JM |
719 | { |
720 | close (0); | |
bf1d7d9c | 721 | check_syscall ("dup'ing tty into fd 0", dup (tty)); |
c5aa993b | 722 | } |
c906108c | 723 | if (tty != 1) |
c5aa993b JM |
724 | { |
725 | close (1); | |
bf1d7d9c | 726 | check_syscall ("dup'ing tty into fd 1", dup (tty)); |
c5aa993b | 727 | } |
c906108c | 728 | if (tty != 2) |
c5aa993b JM |
729 | { |
730 | close (2); | |
bf1d7d9c | 731 | check_syscall ("dup'ing tty into fd 2", dup (tty)); |
c5aa993b | 732 | } |
83116857 TJB |
733 | |
734 | #ifdef TIOCSCTTY | |
735 | /* Make tty our new controlling terminal. */ | |
736 | if (ioctl (tty, TIOCSCTTY, 0) == -1) | |
737 | /* Mention GDB in warning because it will appear in the inferior's | |
738 | terminal instead of GDB's. */ | |
a73c6dcd | 739 | warning (_("GDB: Failed to set controlling terminal: %s"), |
83116857 TJB |
740 | safe_strerror (errno)); |
741 | #endif | |
742 | ||
c906108c | 743 | if (tty > 2) |
c5aa993b JM |
744 | close (tty); |
745 | #endif /* !go32 && !win32 */ | |
c906108c | 746 | } |
191c4426 PA |
747 | |
748 | /* NEW_TTY_POSTFORK is called after forking a new child process, and | |
749 | adding it to the inferior table, to store the TTYNAME being used by | |
750 | the child, or null if it sharing the terminal with gdb. */ | |
751 | ||
752 | void | |
753 | new_tty_postfork (void) | |
754 | { | |
755 | /* Save the name for later, for determining whether we and the child | |
756 | are sharing a tty. */ | |
757 | ||
758 | if (inferior_thisrun_terminal) | |
6c95b8df PA |
759 | { |
760 | struct inferior *inf = current_inferior (); | |
761 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); | |
762 | ||
763 | tinfo->run_terminal = xstrdup (inferior_thisrun_terminal); | |
764 | } | |
191c4426 PA |
765 | |
766 | inferior_thisrun_terminal = NULL; | |
767 | } | |
768 | ||
c906108c SS |
769 | \f |
770 | /* Call set_sigint_trap when you need to pass a signal on to an attached | |
1777feb0 | 771 | process when handling SIGINT. */ |
c906108c | 772 | |
c906108c | 773 | static void |
fba45db2 | 774 | pass_signal (int signo) |
c906108c SS |
775 | { |
776 | #ifndef _WIN32 | |
dfd4cc63 | 777 | kill (ptid_get_pid (inferior_ptid), SIGINT); |
c906108c SS |
778 | #endif |
779 | } | |
780 | ||
c5aa993b | 781 | static void (*osig) (); |
7e1789f5 | 782 | static int osig_set; |
c906108c SS |
783 | |
784 | void | |
fba45db2 | 785 | set_sigint_trap (void) |
c906108c | 786 | { |
181e7f93 | 787 | struct inferior *inf = current_inferior (); |
6c95b8df PA |
788 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); |
789 | ||
790 | if (inf->attach_flag || tinfo->run_terminal) | |
c906108c | 791 | { |
c5aa993b | 792 | osig = (void (*)()) signal (SIGINT, pass_signal); |
7e1789f5 | 793 | osig_set = 1; |
c906108c | 794 | } |
7e1789f5 PA |
795 | else |
796 | osig_set = 0; | |
c906108c SS |
797 | } |
798 | ||
799 | void | |
fba45db2 | 800 | clear_sigint_trap (void) |
c906108c | 801 | { |
7e1789f5 | 802 | if (osig_set) |
c906108c SS |
803 | { |
804 | signal (SIGINT, osig); | |
7e1789f5 | 805 | osig_set = 0; |
c906108c SS |
806 | } |
807 | } | |
808 | \f | |
c906108c | 809 | |
83116857 TJB |
810 | /* Create a new session if the inferior will run in a different tty. |
811 | A session is UNIX's way of grouping processes that share a controlling | |
812 | terminal, so a new one is needed if the inferior terminal will be | |
813 | different from GDB's. | |
814 | ||
815 | Returns the session id of the new session, 0 if no session was created | |
816 | or -1 if an error occurred. */ | |
817 | pid_t | |
818 | create_tty_session (void) | |
819 | { | |
820 | #ifdef HAVE_SETSID | |
821 | pid_t ret; | |
822 | ||
823 | if (!job_control || inferior_thisrun_terminal == 0) | |
824 | return 0; | |
825 | ||
826 | ret = setsid (); | |
827 | if (ret == -1) | |
a73c6dcd | 828 | warning (_("Failed to create new terminal session: setsid: %s"), |
83116857 TJB |
829 | safe_strerror (errno)); |
830 | ||
831 | return ret; | |
832 | #else | |
833 | return 0; | |
834 | #endif /* HAVE_SETSID */ | |
835 | } | |
836 | ||
c906108c SS |
837 | /* This is here because this is where we figure out whether we (probably) |
838 | have job control. Just using job_control only does part of it because | |
839 | setpgid or setpgrp might not exist on a system without job control. | |
840 | It might be considered misplaced (on the other hand, process groups and | |
841 | job control are closely related to ttys). | |
842 | ||
843 | For a more clean implementation, in libiberty, put a setpgid which merely | |
844 | calls setpgrp and a setpgrp which does nothing (any system with job control | |
845 | will have one or the other). */ | |
846 | int | |
fba45db2 | 847 | gdb_setpgid (void) |
c906108c SS |
848 | { |
849 | int retval = 0; | |
850 | ||
851 | if (job_control) | |
852 | { | |
0200359f MK |
853 | #if defined (HAVE_TERMIOS) || defined (TIOCGPGRP) |
854 | #ifdef HAVE_SETPGID | |
855 | /* The call setpgid (0, 0) is supposed to work and mean the same | |
856 | thing as this, but on Ultrix 4.2A it fails with EPERM (and | |
c5aa993b | 857 | setpgid (getpid (), getpid ()) succeeds). */ |
c906108c SS |
858 | retval = setpgid (getpid (), getpid ()); |
859 | #else | |
0200359f MK |
860 | #ifdef HAVE_SETPGRP |
861 | #ifdef SETPGRP_VOID | |
c906108c SS |
862 | retval = setpgrp (); |
863 | #else | |
864 | retval = setpgrp (getpid (), getpid ()); | |
0200359f MK |
865 | #endif |
866 | #endif /* HAVE_SETPGRP */ | |
867 | #endif /* HAVE_SETPGID */ | |
868 | #endif /* defined (HAVE_TERMIOS) || defined (TIOCGPGRP) */ | |
c906108c | 869 | } |
0200359f | 870 | |
c906108c SS |
871 | return retval; |
872 | } | |
873 | ||
0ea3f30e DJ |
874 | /* Get all the current tty settings (including whether we have a |
875 | tty at all!). We can't do this in _initialize_inflow because | |
876 | serial_fdopen() won't work until the serial_ops_list is | |
877 | initialized, but we don't want to do it lazily either, so | |
878 | that we can guarantee stdin_serial is opened if there is | |
879 | a terminal. */ | |
880 | void | |
881 | initialize_stdin_serial (void) | |
882 | { | |
883 | stdin_serial = serial_fdopen (0); | |
884 | } | |
885 | ||
c906108c | 886 | void |
fba45db2 | 887 | _initialize_inflow (void) |
c906108c SS |
888 | { |
889 | add_info ("terminal", term_info, | |
1bedd215 | 890 | _("Print inferior's saved terminal status.")); |
c906108c | 891 | |
7bfc9434 JB |
892 | add_setshow_auto_boolean_cmd ("interactive-mode", class_support, |
893 | &interactive_mode, _("\ | |
894 | Set whether GDB's standard input is a terminal."), _("\ | |
895 | Show whether GDB's standard input is a terminal."), _("\ | |
896 | If on, GDB assumes that standard input is a terminal. In practice, it\n\ | |
897 | means that GDB should wait for the user to answer queries associated to\n\ | |
898 | commands entered at the command prompt. If off, GDB assumes that standard\n\ | |
899 | input is not a terminal, and uses the default answer to all queries.\n\ | |
900 | If auto (the default), determine which mode to use based on the standard\n\ | |
901 | input settings."), | |
902 | NULL, | |
903 | show_interactive_mode, | |
904 | &setlist, &showlist); | |
905 | ||
c906108c SS |
906 | terminal_is_ours = 1; |
907 | ||
908 | /* OK, figure out whether we have job control. If neither termios nor | |
909 | sgtty (i.e. termio or go32), leave job_control 0. */ | |
910 | ||
911 | #if defined (HAVE_TERMIOS) | |
912 | /* Do all systems with termios have the POSIX way of identifying job | |
913 | control? I hope so. */ | |
914 | #ifdef _POSIX_JOB_CONTROL | |
915 | job_control = 1; | |
916 | #else | |
917 | #ifdef _SC_JOB_CONTROL | |
918 | job_control = sysconf (_SC_JOB_CONTROL); | |
919 | #else | |
1777feb0 | 920 | job_control = 0; /* Have to assume the worst. */ |
c5aa993b JM |
921 | #endif /* _SC_JOB_CONTROL */ |
922 | #endif /* _POSIX_JOB_CONTROL */ | |
923 | #endif /* HAVE_TERMIOS */ | |
c906108c SS |
924 | |
925 | #ifdef HAVE_SGTTY | |
926 | #ifdef TIOCGPGRP | |
927 | job_control = 1; | |
928 | #else | |
929 | job_control = 0; | |
930 | #endif /* TIOCGPGRP */ | |
931 | #endif /* sgtty */ | |
7e1789f5 | 932 | |
7e1789f5 | 933 | observer_attach_inferior_exit (inflow_inferior_exit); |
6c95b8df PA |
934 | |
935 | inflow_inferior_data | |
8e260fc0 | 936 | = register_inferior_data_with_cleanup (NULL, inflow_inferior_data_cleanup); |
c906108c | 937 | } |