Commit | Line | Data |
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c906108c | 1 | /* Low level interface to ptrace, for GDB when running under Unix. |
197e01b6 | 2 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
0fb0cc75 | 3 | 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, |
7b6bb8da | 4 | 2009, 2010, 2011 Free Software Foundation, Inc. |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c5aa993b | 11 | (at your option) any later version. |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b | 18 | You should have received a copy of the GNU General Public License |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include "frame.h" | |
23 | #include "inferior.h" | |
24 | #include "command.h" | |
c906108c SS |
25 | #include "serial.h" |
26 | #include "terminal.h" | |
27 | #include "target.h" | |
28 | #include "gdbthread.h" | |
7e1789f5 | 29 | #include "observer.h" |
c906108c SS |
30 | |
31 | #include "gdb_string.h" | |
32 | #include <signal.h> | |
33 | #include <fcntl.h> | |
0ea3f30e | 34 | #include "gdb_select.h" |
c906108c | 35 | |
44270758 | 36 | #include "inflow.h" |
7bfc9434 | 37 | #include "gdbcmd.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 | extern void _initialize_inflow (void); |
392a587b | 48 | |
a14ed312 | 49 | static void pass_signal (int); |
c906108c | 50 | |
a14ed312 | 51 | static void terminal_ours_1 (int); |
c906108c SS |
52 | \f |
53 | /* Record terminal status separately for debugger and inferior. */ | |
54 | ||
819cc324 | 55 | static struct serial *stdin_serial; |
c906108c | 56 | |
7e1789f5 PA |
57 | /* Terminal related info we need to keep track of. Each inferior |
58 | holds an instance of this structure --- we save it whenever the | |
59 | corresponding inferior stops, and restore it to the foreground | |
60 | inferior when it resumes. */ | |
61 | struct terminal_info | |
62 | { | |
63 | /* The name of the tty (from the `tty' command) that we gave to the | |
64 | inferior when it was started. */ | |
191c4426 | 65 | char *run_terminal; |
7e1789f5 PA |
66 | |
67 | /* TTY state. We save it whenever the inferior stops, and restore | |
68 | it when it resumes. */ | |
69 | serial_ttystate ttystate; | |
70 | ||
71 | #ifdef PROCESS_GROUP_TYPE | |
72 | /* Process group. Saved and restored just like ttystate. */ | |
73 | PROCESS_GROUP_TYPE process_group; | |
74 | #endif | |
c906108c | 75 | |
7e1789f5 PA |
76 | /* fcntl flags. Saved and restored just like ttystate. */ |
77 | int tflags; | |
78 | }; | |
c906108c | 79 | |
7e1789f5 PA |
80 | /* Our own tty state, which we restore every time we need to deal with |
81 | the terminal. This is only set once, when GDB first starts. The | |
82 | settings of flags which readline saves and restores and | |
83 | unimportant. */ | |
84 | static struct terminal_info our_terminal_info; | |
c906108c | 85 | |
6c95b8df PA |
86 | static struct terminal_info *get_inflow_inferior_data (struct inferior *); |
87 | ||
c906108c | 88 | #ifdef PROCESS_GROUP_TYPE |
7e1789f5 PA |
89 | |
90 | /* Return the process group of the current inferior. */ | |
91 | ||
92 | PROCESS_GROUP_TYPE | |
93 | inferior_process_group (void) | |
94 | { | |
6c95b8df | 95 | return get_inflow_inferior_data (current_inferior ())->process_group; |
7e1789f5 | 96 | } |
c906108c SS |
97 | #endif |
98 | ||
99 | /* While the inferior is running, we want SIGINT and SIGQUIT to go to the | |
100 | inferior only. If we have job control, that takes care of it. If not, | |
101 | we save our handlers in these two variables and set SIGINT and SIGQUIT | |
102 | to SIG_IGN. */ | |
103 | ||
104 | static void (*sigint_ours) (); | |
105 | static void (*sigquit_ours) (); | |
106 | ||
7e1789f5 PA |
107 | /* The name of the tty (from the `tty' command) that we're giving to |
108 | the inferior when starting it up. This is only (and should only | |
191c4426 PA |
109 | be) used as a transient global by new_tty_prefork, |
110 | create_tty_session, new_tty and new_tty_postfork, all called from | |
111 | fork_inferior, while forking a new child. */ | |
3cb3b8df | 112 | static const char *inferior_thisrun_terminal; |
c906108c SS |
113 | |
114 | /* Nonzero if our terminal settings are in effect. Zero if the | |
115 | inferior's settings are in effect. Ignored if !gdb_has_a_terminal | |
116 | (). */ | |
117 | ||
118 | int terminal_is_ours; | |
119 | ||
64a0ac84 PA |
120 | #ifdef PROCESS_GROUP_TYPE |
121 | static PROCESS_GROUP_TYPE | |
122 | gdb_getpgrp (void) | |
123 | { | |
124 | int process_group = -1; | |
abbb1732 | 125 | |
64a0ac84 PA |
126 | #ifdef HAVE_TERMIOS |
127 | process_group = tcgetpgrp (0); | |
128 | #endif | |
129 | #ifdef HAVE_TERMIO | |
130 | process_group = getpgrp (); | |
131 | #endif | |
132 | #ifdef HAVE_SGTTY | |
133 | ioctl (0, TIOCGPGRP, &process_group); | |
134 | #endif | |
135 | return process_group; | |
136 | } | |
137 | #endif | |
138 | ||
c5aa993b JM |
139 | enum |
140 | { | |
141 | yes, no, have_not_checked | |
142 | } | |
143 | gdb_has_a_terminal_flag = have_not_checked; | |
c906108c | 144 | |
7bfc9434 JB |
145 | /* The value of the "interactive-mode" setting. */ |
146 | static enum auto_boolean interactive_mode = AUTO_BOOLEAN_AUTO; | |
147 | ||
148 | /* Implement the "show interactive-mode" option. */ | |
149 | ||
150 | static void | |
151 | show_interactive_mode (struct ui_file *file, int from_tty, | |
152 | struct cmd_list_element *c, | |
153 | const char *value) | |
154 | { | |
155 | if (interactive_mode == AUTO_BOOLEAN_AUTO) | |
156 | fprintf_filtered (file, "Debugger's interactive mode " | |
157 | "is %s (currently %s).\n", | |
158 | value, gdb_has_a_terminal () ? "on" : "off"); | |
159 | else | |
160 | fprintf_filtered (file, "Debugger's interactive mode is %s.\n", value); | |
161 | } | |
162 | ||
c906108c SS |
163 | /* Does GDB have a terminal (on stdin)? */ |
164 | int | |
fba45db2 | 165 | gdb_has_a_terminal (void) |
c906108c | 166 | { |
7bfc9434 | 167 | if (interactive_mode != AUTO_BOOLEAN_AUTO) |
6b0c4c1f | 168 | return interactive_mode == AUTO_BOOLEAN_TRUE; |
7bfc9434 | 169 | |
c906108c SS |
170 | switch (gdb_has_a_terminal_flag) |
171 | { | |
172 | case yes: | |
173 | return 1; | |
174 | case no: | |
175 | return 0; | |
176 | case have_not_checked: | |
2cd58942 AC |
177 | /* Get all the current tty settings (including whether we have a |
178 | tty at all!). Can't do this in _initialize_inflow because | |
179 | serial_fdopen() won't work until the serial_ops_list is | |
180 | initialized. */ | |
c906108c SS |
181 | |
182 | #ifdef F_GETFL | |
7e1789f5 | 183 | our_terminal_info.tflags = fcntl (0, F_GETFL, 0); |
c906108c SS |
184 | #endif |
185 | ||
186 | gdb_has_a_terminal_flag = no; | |
c906108c SS |
187 | if (stdin_serial != NULL) |
188 | { | |
7e1789f5 | 189 | our_terminal_info.ttystate = serial_get_tty_state (stdin_serial); |
c906108c | 190 | |
7e1789f5 | 191 | if (our_terminal_info.ttystate != NULL) |
c906108c SS |
192 | { |
193 | gdb_has_a_terminal_flag = yes; | |
807bddf3 | 194 | #ifdef PROCESS_GROUP_TYPE |
7e1789f5 | 195 | our_terminal_info.process_group = gdb_getpgrp (); |
807bddf3 | 196 | #endif |
c906108c SS |
197 | } |
198 | } | |
199 | ||
200 | return gdb_has_a_terminal_flag == yes; | |
201 | default: | |
202 | /* "Can't happen". */ | |
203 | return 0; | |
204 | } | |
205 | } | |
206 | ||
207 | /* Macro for printing errors from ioctl operations */ | |
208 | ||
209 | #define OOPSY(what) \ | |
210 | if (result == -1) \ | |
211 | fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ | |
dc672865 | 212 | what, safe_strerror (errno)) |
c906108c | 213 | |
a14ed312 | 214 | static void terminal_ours_1 (int); |
c906108c SS |
215 | |
216 | /* Initialize the terminal settings we record for the inferior, | |
217 | before we actually run the inferior. */ | |
218 | ||
219 | void | |
fba45db2 | 220 | terminal_init_inferior_with_pgrp (int pgrp) |
c906108c SS |
221 | { |
222 | if (gdb_has_a_terminal ()) | |
223 | { | |
7e1789f5 | 224 | struct inferior *inf = current_inferior (); |
6c95b8df | 225 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); |
7e1789f5 | 226 | |
2cd58942 AC |
227 | /* We could just as well copy our_ttystate (if we felt like |
228 | adding a new function serial_copy_tty_state()). */ | |
6c95b8df PA |
229 | xfree (tinfo->ttystate); |
230 | tinfo->ttystate = serial_get_tty_state (stdin_serial); | |
c906108c SS |
231 | |
232 | #ifdef PROCESS_GROUP_TYPE | |
6c95b8df | 233 | tinfo->process_group = pgrp; |
c906108c SS |
234 | #endif |
235 | ||
236 | /* Make sure that next time we call terminal_inferior (which will be | |
c5aa993b JM |
237 | before the program runs, as it needs to be), we install the new |
238 | process group. */ | |
c906108c SS |
239 | terminal_is_ours = 1; |
240 | } | |
241 | } | |
242 | ||
a790ad35 SC |
243 | /* Save the terminal settings again. This is necessary for the TUI |
244 | when it switches to TUI or non-TUI mode; curses changes the terminal | |
245 | and gdb must be able to restore it correctly. */ | |
246 | ||
247 | void | |
7bda5e4a | 248 | terminal_save_ours (void) |
a790ad35 SC |
249 | { |
250 | if (gdb_has_a_terminal ()) | |
251 | { | |
252 | /* We could just as well copy our_ttystate (if we felt like adding | |
253 | a new function serial_copy_tty_state). */ | |
7e1789f5 PA |
254 | xfree (our_terminal_info.ttystate); |
255 | our_terminal_info.ttystate = serial_get_tty_state (stdin_serial); | |
a790ad35 SC |
256 | } |
257 | } | |
258 | ||
c906108c | 259 | void |
fba45db2 | 260 | terminal_init_inferior (void) |
c906108c SS |
261 | { |
262 | #ifdef PROCESS_GROUP_TYPE | |
263 | /* This is for Lynx, and should be cleaned up by having Lynx be a separate | |
264 | debugging target with a version of target_terminal_init_inferior which | |
265 | passes in the process group to a generic routine which does all the work | |
266 | (and the non-threaded child_terminal_init_inferior can just pass in | |
39f77062 | 267 | inferior_ptid to the same routine). */ |
c906108c | 268 | /* We assume INFERIOR_PID is also the child's process group. */ |
39f77062 | 269 | terminal_init_inferior_with_pgrp (PIDGET (inferior_ptid)); |
c906108c SS |
270 | #endif /* PROCESS_GROUP_TYPE */ |
271 | } | |
272 | ||
273 | /* Put the inferior's terminal settings into effect. | |
274 | This is preparation for starting or resuming the inferior. */ | |
275 | ||
276 | void | |
fba45db2 | 277 | terminal_inferior (void) |
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 | |
355 | should be called to get back to a normal state of affairs. */ | |
356 | ||
357 | void | |
fba45db2 | 358 | terminal_ours_for_output (void) |
c906108c SS |
359 | { |
360 | terminal_ours_1 (1); | |
361 | } | |
362 | ||
363 | /* Put our terminal settings into effect. | |
364 | First record the inferior's terminal settings | |
365 | so they can be restored properly later. */ | |
366 | ||
367 | void | |
fba45db2 | 368 | terminal_ours (void) |
c906108c SS |
369 | { |
370 | terminal_ours_1 (0); | |
371 | } | |
372 | ||
373 | /* output_only is not used, and should not be used unless we introduce | |
374 | separate terminal_is_ours and terminal_is_ours_for_output | |
375 | flags. */ | |
376 | ||
377 | static void | |
fba45db2 | 378 | terminal_ours_1 (int output_only) |
c906108c | 379 | { |
7e1789f5 | 380 | struct inferior *inf; |
6c95b8df | 381 | struct terminal_info *tinfo; |
7e1789f5 PA |
382 | |
383 | if (terminal_is_ours) | |
384 | return; | |
385 | ||
d9d2d8b6 PA |
386 | terminal_is_ours = 1; |
387 | ||
7e1789f5 | 388 | /* Checking inferior->run_terminal is necessary so that |
c906108c SS |
389 | if GDB is running in the background, it won't block trying |
390 | to do the ioctl()'s below. Checking gdb_has_a_terminal | |
391 | avoids attempting all the ioctl's when running in batch. */ | |
7e1789f5 PA |
392 | |
393 | inf = current_inferior (); | |
6c95b8df | 394 | tinfo = get_inflow_inferior_data (inf); |
7e1789f5 | 395 | |
6c95b8df | 396 | if (tinfo->run_terminal != NULL || gdb_has_a_terminal () == 0) |
c906108c SS |
397 | return; |
398 | ||
c906108c | 399 | { |
4b69c284 | 400 | #ifdef SIGTTOU |
c906108c | 401 | /* Ignore this signal since it will happen when we try to set the |
c5aa993b | 402 | pgrp. */ |
4b69c284 AC |
403 | void (*osigttou) () = NULL; |
404 | #endif | |
c906108c SS |
405 | int result; |
406 | ||
c906108c SS |
407 | #ifdef SIGTTOU |
408 | if (job_control) | |
c5aa993b | 409 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
c906108c SS |
410 | #endif |
411 | ||
6c95b8df PA |
412 | xfree (tinfo->ttystate); |
413 | tinfo->ttystate = serial_get_tty_state (stdin_serial); | |
64a0ac84 | 414 | |
49a834f9 | 415 | #ifdef PROCESS_GROUP_TYPE |
181e7f93 | 416 | if (!inf->attach_flag) |
64a0ac84 PA |
417 | /* If setpgrp failed in terminal_inferior, this would give us |
418 | our process group instead of the inferior's. See | |
419 | terminal_inferior for details. */ | |
6c95b8df | 420 | tinfo->process_group = gdb_getpgrp (); |
49a834f9 | 421 | #endif |
c906108c SS |
422 | |
423 | /* Here we used to set ICANON in our ttystate, but I believe this | |
c5aa993b JM |
424 | was an artifact from before when we used readline. Readline sets |
425 | the tty state when it needs to. | |
426 | FIXME-maybe: However, query() expects non-raw mode and doesn't | |
427 | use readline. Maybe query should use readline (on the other hand, | |
428 | this only matters for HAVE_SGTTY, not termio or termios, I think). */ | |
c906108c SS |
429 | |
430 | /* Set tty state to our_ttystate. We don't change in our out of raw | |
c5aa993b JM |
431 | mode, to avoid flushing input. We need to do the same thing |
432 | regardless of output_only, because we don't have separate | |
433 | terminal_is_ours and terminal_is_ours_for_output flags. It's OK, | |
1777feb0 MS |
434 | though, since readline will deal with raw mode when/if it needs |
435 | to. */ | |
c906108c | 436 | |
7e1789f5 | 437 | serial_noflush_set_tty_state (stdin_serial, our_terminal_info.ttystate, |
6c95b8df | 438 | tinfo->ttystate); |
c906108c SS |
439 | |
440 | if (job_control) | |
441 | { | |
442 | #ifdef HAVE_TERMIOS | |
7e1789f5 | 443 | result = tcsetpgrp (0, our_terminal_info.process_group); |
c906108c SS |
444 | #if 0 |
445 | /* This fails on Ultrix with EINVAL if you run the testsuite | |
446 | in the background with nohup, and then log out. GDB never | |
447 | used to check for an error here, so perhaps there are other | |
448 | such situations as well. */ | |
449 | if (result == -1) | |
3e43a32a MS |
450 | fprintf_unfiltered (gdb_stderr, |
451 | "[tcsetpgrp failed in terminal_ours: %s]\n", | |
dc672865 | 452 | safe_strerror (errno)); |
c906108c SS |
453 | #endif |
454 | #endif /* termios */ | |
455 | ||
456 | #ifdef HAVE_SGTTY | |
7e1789f5 | 457 | result = ioctl (0, TIOCSPGRP, &our_terminal_info.process_group); |
c906108c SS |
458 | #endif |
459 | } | |
460 | ||
461 | #ifdef SIGTTOU | |
462 | if (job_control) | |
463 | signal (SIGTTOU, osigttou); | |
464 | #endif | |
465 | ||
466 | if (!job_control) | |
467 | { | |
468 | signal (SIGINT, sigint_ours); | |
469 | #ifdef SIGQUIT | |
470 | signal (SIGQUIT, sigquit_ours); | |
471 | #endif | |
472 | } | |
473 | ||
474 | #ifdef F_GETFL | |
6c95b8df | 475 | tinfo->tflags = fcntl (0, F_GETFL, 0); |
c906108c SS |
476 | |
477 | /* Is there a reason this is being done twice? It happens both | |
c5aa993b JM |
478 | places we use F_SETFL, so I'm inclined to think perhaps there |
479 | is some reason, however perverse. Perhaps not though... */ | |
7e1789f5 PA |
480 | result = fcntl (0, F_SETFL, our_terminal_info.tflags); |
481 | result = fcntl (0, F_SETFL, our_terminal_info.tflags); | |
c906108c | 482 | #endif |
c906108c SS |
483 | } |
484 | } | |
485 | ||
6c95b8df PA |
486 | /* Per-inferior data key. */ |
487 | static const struct inferior_data *inflow_inferior_data; | |
7e1789f5 PA |
488 | |
489 | static void | |
6c95b8df | 490 | inflow_inferior_data_cleanup (struct inferior *inf, void *arg) |
7e1789f5 | 491 | { |
6c95b8df PA |
492 | struct terminal_info *info; |
493 | ||
494 | info = inferior_data (inf, inflow_inferior_data); | |
495 | if (info != NULL) | |
496 | { | |
497 | xfree (info->run_terminal); | |
498 | xfree (info); | |
499 | } | |
500 | } | |
501 | ||
502 | /* Get the current svr4 data. If none is found yet, add it now. This | |
503 | function always returns a valid object. */ | |
504 | ||
505 | static struct terminal_info * | |
506 | get_inflow_inferior_data (struct inferior *inf) | |
507 | { | |
508 | struct terminal_info *info; | |
509 | ||
510 | info = inferior_data (inf, inflow_inferior_data); | |
511 | if (info == NULL) | |
512 | { | |
513 | info = XZALLOC (struct terminal_info); | |
514 | set_inferior_data (inf, inflow_inferior_data, info); | |
515 | } | |
7e1789f5 | 516 | |
6c95b8df | 517 | return info; |
7e1789f5 PA |
518 | } |
519 | ||
520 | /* This is a "inferior_exit" observer. Releases the TERMINAL_INFO member | |
521 | of the inferior structure. This field is private to inflow.c, and | |
522 | its type is opaque to the rest of GDB. PID is the target pid of | |
523 | the inferior that is about to be removed from the inferior | |
524 | list. */ | |
525 | ||
526 | static void | |
a79b8f6e | 527 | inflow_inferior_exit (struct inferior *inf) |
7e1789f5 | 528 | { |
6c95b8df | 529 | struct terminal_info *info; |
7e1789f5 | 530 | |
6c95b8df PA |
531 | info = inferior_data (inf, inflow_inferior_data); |
532 | if (info != NULL) | |
533 | { | |
534 | xfree (info->run_terminal); | |
535 | xfree (info); | |
536 | set_inferior_data (inf, inflow_inferior_data, NULL); | |
537 | } | |
7e1789f5 PA |
538 | } |
539 | ||
191c4426 PA |
540 | void |
541 | copy_terminal_info (struct inferior *to, struct inferior *from) | |
542 | { | |
6c95b8df PA |
543 | struct terminal_info *tinfo_to, *tinfo_from; |
544 | ||
545 | tinfo_to = get_inflow_inferior_data (to); | |
546 | tinfo_from = get_inflow_inferior_data (from); | |
547 | *tinfo_to = *tinfo_from; | |
548 | if (tinfo_from->run_terminal) | |
549 | tinfo_to->run_terminal | |
550 | = xstrdup (tinfo_from->run_terminal); | |
191c4426 PA |
551 | } |
552 | ||
c906108c | 553 | void |
fba45db2 | 554 | term_info (char *arg, int from_tty) |
c906108c SS |
555 | { |
556 | target_terminal_info (arg, from_tty); | |
557 | } | |
558 | ||
c906108c | 559 | void |
fba45db2 | 560 | child_terminal_info (char *args, int from_tty) |
c906108c | 561 | { |
7e1789f5 | 562 | struct inferior *inf; |
6c95b8df | 563 | struct terminal_info *tinfo; |
7e1789f5 | 564 | |
c906108c SS |
565 | if (!gdb_has_a_terminal ()) |
566 | { | |
a3f17187 | 567 | printf_filtered (_("This GDB does not control a terminal.\n")); |
c906108c SS |
568 | return; |
569 | } | |
570 | ||
7e1789f5 PA |
571 | if (ptid_equal (inferior_ptid, null_ptid)) |
572 | return; | |
573 | ||
574 | inf = current_inferior (); | |
6c95b8df | 575 | tinfo = get_inflow_inferior_data (inf); |
7e1789f5 | 576 | |
3e43a32a MS |
577 | printf_filtered (_("Inferior's terminal status " |
578 | "(currently saved by GDB):\n")); | |
c906108c SS |
579 | |
580 | /* First the fcntl flags. */ | |
581 | { | |
582 | int flags; | |
c5aa993b | 583 | |
6c95b8df | 584 | flags = tinfo->tflags; |
c906108c SS |
585 | |
586 | printf_filtered ("File descriptor flags = "); | |
587 | ||
588 | #ifndef O_ACCMODE | |
589 | #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) | |
590 | #endif | |
1777feb0 | 591 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug. */ |
c906108c SS |
592 | switch (flags & (O_ACCMODE)) |
593 | { | |
c5aa993b JM |
594 | case O_RDONLY: |
595 | printf_filtered ("O_RDONLY"); | |
596 | break; | |
597 | case O_WRONLY: | |
598 | printf_filtered ("O_WRONLY"); | |
599 | break; | |
600 | case O_RDWR: | |
601 | printf_filtered ("O_RDWR"); | |
602 | break; | |
c906108c SS |
603 | } |
604 | flags &= ~(O_ACCMODE); | |
605 | ||
606 | #ifdef O_NONBLOCK | |
c5aa993b | 607 | if (flags & O_NONBLOCK) |
c906108c SS |
608 | printf_filtered (" | O_NONBLOCK"); |
609 | flags &= ~O_NONBLOCK; | |
610 | #endif | |
c5aa993b | 611 | |
c906108c SS |
612 | #if defined (O_NDELAY) |
613 | /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will | |
614 | print it as O_NONBLOCK, which is good cause that is what POSIX | |
615 | has, and the flag will already be cleared by the time we get here. */ | |
616 | if (flags & O_NDELAY) | |
617 | printf_filtered (" | O_NDELAY"); | |
618 | flags &= ~O_NDELAY; | |
619 | #endif | |
620 | ||
621 | if (flags & O_APPEND) | |
622 | printf_filtered (" | O_APPEND"); | |
623 | flags &= ~O_APPEND; | |
624 | ||
625 | #if defined (O_BINARY) | |
626 | if (flags & O_BINARY) | |
627 | printf_filtered (" | O_BINARY"); | |
628 | flags &= ~O_BINARY; | |
629 | #endif | |
630 | ||
631 | if (flags) | |
632 | printf_filtered (" | 0x%x", flags); | |
633 | printf_filtered ("\n"); | |
634 | } | |
635 | ||
636 | #ifdef PROCESS_GROUP_TYPE | |
6c95b8df | 637 | printf_filtered ("Process group = %d\n", (int) tinfo->process_group); |
c906108c SS |
638 | #endif |
639 | ||
6c95b8df | 640 | serial_print_tty_state (stdin_serial, tinfo->ttystate, gdb_stdout); |
c906108c SS |
641 | } |
642 | \f | |
643 | /* NEW_TTY_PREFORK is called before forking a new child process, | |
644 | so we can record the state of ttys in the child to be formed. | |
645 | TTYNAME is null if we are to share the terminal with gdb; | |
646 | or points to a string containing the name of the desired tty. | |
647 | ||
648 | NEW_TTY is called in new child processes under Unix, which will | |
649 | become debugger target processes. This actually switches to | |
650 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
651 | ||
652 | void | |
3cb3b8df | 653 | new_tty_prefork (const char *ttyname) |
c906108c SS |
654 | { |
655 | /* Save the name for later, for determining whether we and the child | |
656 | are sharing a tty. */ | |
657 | inferior_thisrun_terminal = ttyname; | |
658 | } | |
659 | ||
e6d088ec | 660 | #if !defined(__GO32__) && !defined(_WIN32) |
bf1d7d9c JB |
661 | /* If RESULT, assumed to be the return value from a system call, is |
662 | negative, print the error message indicated by errno and exit. | |
663 | MSG should identify the operation that failed. */ | |
664 | static void | |
665 | check_syscall (const char *msg, int result) | |
666 | { | |
667 | if (result < 0) | |
668 | { | |
669 | print_sys_errmsg (msg, errno); | |
670 | _exit (1); | |
671 | } | |
672 | } | |
e6d088ec | 673 | #endif |
bf1d7d9c | 674 | |
c906108c | 675 | void |
fba45db2 | 676 | new_tty (void) |
c906108c | 677 | { |
52f0bd74 | 678 | int tty; |
c906108c SS |
679 | |
680 | if (inferior_thisrun_terminal == 0) | |
681 | return; | |
682 | #if !defined(__GO32__) && !defined(_WIN32) | |
683 | #ifdef TIOCNOTTY | |
684 | /* Disconnect the child process from our controlling terminal. On some | |
685 | systems (SVR4 for example), this may cause a SIGTTOU, so temporarily | |
1777feb0 | 686 | ignore SIGTTOU. */ |
c5aa993b | 687 | tty = open ("/dev/tty", O_RDWR); |
c906108c SS |
688 | if (tty > 0) |
689 | { | |
690 | void (*osigttou) (); | |
691 | ||
c5aa993b JM |
692 | osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN); |
693 | ioctl (tty, TIOCNOTTY, 0); | |
694 | close (tty); | |
695 | signal (SIGTTOU, osigttou); | |
c906108c SS |
696 | } |
697 | #endif | |
698 | ||
699 | /* Now open the specified new terminal. */ | |
c5aa993b | 700 | tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY); |
bf1d7d9c | 701 | check_syscall (inferior_thisrun_terminal, tty); |
c906108c SS |
702 | |
703 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
704 | if (tty != 0) | |
c5aa993b JM |
705 | { |
706 | close (0); | |
bf1d7d9c | 707 | check_syscall ("dup'ing tty into fd 0", dup (tty)); |
c5aa993b | 708 | } |
c906108c | 709 | if (tty != 1) |
c5aa993b JM |
710 | { |
711 | close (1); | |
bf1d7d9c | 712 | check_syscall ("dup'ing tty into fd 1", dup (tty)); |
c5aa993b | 713 | } |
c906108c | 714 | if (tty != 2) |
c5aa993b JM |
715 | { |
716 | close (2); | |
bf1d7d9c | 717 | check_syscall ("dup'ing tty into fd 2", dup (tty)); |
c5aa993b | 718 | } |
83116857 TJB |
719 | |
720 | #ifdef TIOCSCTTY | |
721 | /* Make tty our new controlling terminal. */ | |
722 | if (ioctl (tty, TIOCSCTTY, 0) == -1) | |
723 | /* Mention GDB in warning because it will appear in the inferior's | |
724 | terminal instead of GDB's. */ | |
a73c6dcd | 725 | warning (_("GDB: Failed to set controlling terminal: %s"), |
83116857 TJB |
726 | safe_strerror (errno)); |
727 | #endif | |
728 | ||
c906108c | 729 | if (tty > 2) |
c5aa993b JM |
730 | close (tty); |
731 | #endif /* !go32 && !win32 */ | |
c906108c | 732 | } |
191c4426 PA |
733 | |
734 | /* NEW_TTY_POSTFORK is called after forking a new child process, and | |
735 | adding it to the inferior table, to store the TTYNAME being used by | |
736 | the child, or null if it sharing the terminal with gdb. */ | |
737 | ||
738 | void | |
739 | new_tty_postfork (void) | |
740 | { | |
741 | /* Save the name for later, for determining whether we and the child | |
742 | are sharing a tty. */ | |
743 | ||
744 | if (inferior_thisrun_terminal) | |
6c95b8df PA |
745 | { |
746 | struct inferior *inf = current_inferior (); | |
747 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); | |
748 | ||
749 | tinfo->run_terminal = xstrdup (inferior_thisrun_terminal); | |
750 | } | |
191c4426 PA |
751 | |
752 | inferior_thisrun_terminal = NULL; | |
753 | } | |
754 | ||
c906108c SS |
755 | \f |
756 | /* Call set_sigint_trap when you need to pass a signal on to an attached | |
1777feb0 | 757 | process when handling SIGINT. */ |
c906108c | 758 | |
c906108c | 759 | static void |
fba45db2 | 760 | pass_signal (int signo) |
c906108c SS |
761 | { |
762 | #ifndef _WIN32 | |
39f77062 | 763 | kill (PIDGET (inferior_ptid), SIGINT); |
c906108c SS |
764 | #endif |
765 | } | |
766 | ||
c5aa993b | 767 | static void (*osig) (); |
7e1789f5 | 768 | static int osig_set; |
c906108c SS |
769 | |
770 | void | |
fba45db2 | 771 | set_sigint_trap (void) |
c906108c | 772 | { |
181e7f93 | 773 | struct inferior *inf = current_inferior (); |
6c95b8df PA |
774 | struct terminal_info *tinfo = get_inflow_inferior_data (inf); |
775 | ||
776 | if (inf->attach_flag || tinfo->run_terminal) | |
c906108c | 777 | { |
c5aa993b | 778 | osig = (void (*)()) signal (SIGINT, pass_signal); |
7e1789f5 | 779 | osig_set = 1; |
c906108c | 780 | } |
7e1789f5 PA |
781 | else |
782 | osig_set = 0; | |
c906108c SS |
783 | } |
784 | ||
785 | void | |
fba45db2 | 786 | clear_sigint_trap (void) |
c906108c | 787 | { |
7e1789f5 | 788 | if (osig_set) |
c906108c SS |
789 | { |
790 | signal (SIGINT, osig); | |
7e1789f5 | 791 | osig_set = 0; |
c906108c SS |
792 | } |
793 | } | |
794 | \f | |
c906108c | 795 | |
83116857 TJB |
796 | /* Create a new session if the inferior will run in a different tty. |
797 | A session is UNIX's way of grouping processes that share a controlling | |
798 | terminal, so a new one is needed if the inferior terminal will be | |
799 | different from GDB's. | |
800 | ||
801 | Returns the session id of the new session, 0 if no session was created | |
802 | or -1 if an error occurred. */ | |
803 | pid_t | |
804 | create_tty_session (void) | |
805 | { | |
806 | #ifdef HAVE_SETSID | |
807 | pid_t ret; | |
808 | ||
809 | if (!job_control || inferior_thisrun_terminal == 0) | |
810 | return 0; | |
811 | ||
812 | ret = setsid (); | |
813 | if (ret == -1) | |
a73c6dcd | 814 | warning (_("Failed to create new terminal session: setsid: %s"), |
83116857 TJB |
815 | safe_strerror (errno)); |
816 | ||
817 | return ret; | |
818 | #else | |
819 | return 0; | |
820 | #endif /* HAVE_SETSID */ | |
821 | } | |
822 | ||
c906108c SS |
823 | /* This is here because this is where we figure out whether we (probably) |
824 | have job control. Just using job_control only does part of it because | |
825 | setpgid or setpgrp might not exist on a system without job control. | |
826 | It might be considered misplaced (on the other hand, process groups and | |
827 | job control are closely related to ttys). | |
828 | ||
829 | For a more clean implementation, in libiberty, put a setpgid which merely | |
830 | calls setpgrp and a setpgrp which does nothing (any system with job control | |
831 | will have one or the other). */ | |
832 | int | |
fba45db2 | 833 | gdb_setpgid (void) |
c906108c SS |
834 | { |
835 | int retval = 0; | |
836 | ||
837 | if (job_control) | |
838 | { | |
0200359f MK |
839 | #if defined (HAVE_TERMIOS) || defined (TIOCGPGRP) |
840 | #ifdef HAVE_SETPGID | |
841 | /* The call setpgid (0, 0) is supposed to work and mean the same | |
842 | thing as this, but on Ultrix 4.2A it fails with EPERM (and | |
c5aa993b | 843 | setpgid (getpid (), getpid ()) succeeds). */ |
c906108c SS |
844 | retval = setpgid (getpid (), getpid ()); |
845 | #else | |
0200359f MK |
846 | #ifdef HAVE_SETPGRP |
847 | #ifdef SETPGRP_VOID | |
c906108c SS |
848 | retval = setpgrp (); |
849 | #else | |
850 | retval = setpgrp (getpid (), getpid ()); | |
0200359f MK |
851 | #endif |
852 | #endif /* HAVE_SETPGRP */ | |
853 | #endif /* HAVE_SETPGID */ | |
854 | #endif /* defined (HAVE_TERMIOS) || defined (TIOCGPGRP) */ | |
c906108c | 855 | } |
0200359f | 856 | |
c906108c SS |
857 | return retval; |
858 | } | |
859 | ||
0ea3f30e DJ |
860 | /* Get all the current tty settings (including whether we have a |
861 | tty at all!). We can't do this in _initialize_inflow because | |
862 | serial_fdopen() won't work until the serial_ops_list is | |
863 | initialized, but we don't want to do it lazily either, so | |
864 | that we can guarantee stdin_serial is opened if there is | |
865 | a terminal. */ | |
866 | void | |
867 | initialize_stdin_serial (void) | |
868 | { | |
869 | stdin_serial = serial_fdopen (0); | |
870 | } | |
871 | ||
c906108c | 872 | void |
fba45db2 | 873 | _initialize_inflow (void) |
c906108c SS |
874 | { |
875 | add_info ("terminal", term_info, | |
1bedd215 | 876 | _("Print inferior's saved terminal status.")); |
c906108c | 877 | |
7bfc9434 JB |
878 | add_setshow_auto_boolean_cmd ("interactive-mode", class_support, |
879 | &interactive_mode, _("\ | |
880 | Set whether GDB's standard input is a terminal."), _("\ | |
881 | Show whether GDB's standard input is a terminal."), _("\ | |
882 | If on, GDB assumes that standard input is a terminal. In practice, it\n\ | |
883 | means that GDB should wait for the user to answer queries associated to\n\ | |
884 | commands entered at the command prompt. If off, GDB assumes that standard\n\ | |
885 | input is not a terminal, and uses the default answer to all queries.\n\ | |
886 | If auto (the default), determine which mode to use based on the standard\n\ | |
887 | input settings."), | |
888 | NULL, | |
889 | show_interactive_mode, | |
890 | &setlist, &showlist); | |
891 | ||
c906108c SS |
892 | terminal_is_ours = 1; |
893 | ||
894 | /* OK, figure out whether we have job control. If neither termios nor | |
895 | sgtty (i.e. termio or go32), leave job_control 0. */ | |
896 | ||
897 | #if defined (HAVE_TERMIOS) | |
898 | /* Do all systems with termios have the POSIX way of identifying job | |
899 | control? I hope so. */ | |
900 | #ifdef _POSIX_JOB_CONTROL | |
901 | job_control = 1; | |
902 | #else | |
903 | #ifdef _SC_JOB_CONTROL | |
904 | job_control = sysconf (_SC_JOB_CONTROL); | |
905 | #else | |
1777feb0 | 906 | job_control = 0; /* Have to assume the worst. */ |
c5aa993b JM |
907 | #endif /* _SC_JOB_CONTROL */ |
908 | #endif /* _POSIX_JOB_CONTROL */ | |
909 | #endif /* HAVE_TERMIOS */ | |
c906108c SS |
910 | |
911 | #ifdef HAVE_SGTTY | |
912 | #ifdef TIOCGPGRP | |
913 | job_control = 1; | |
914 | #else | |
915 | job_control = 0; | |
916 | #endif /* TIOCGPGRP */ | |
917 | #endif /* sgtty */ | |
7e1789f5 | 918 | |
7e1789f5 | 919 | observer_attach_inferior_exit (inflow_inferior_exit); |
6c95b8df PA |
920 | |
921 | inflow_inferior_data | |
922 | = register_inferior_data_with_cleanup (inflow_inferior_data_cleanup); | |
c906108c | 923 | } |