Commit | Line | Data |
---|---|---|
bd5635a1 | 1 | /* Low level interface to ptrace, for GDB when running under Unix. |
ee0613d1 | 2 | Copyright 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc. |
bd5635a1 RP |
3 | |
4 | This file is part of GDB. | |
5 | ||
715d2e06 | 6 | This program is free software; you can redistribute it and/or modify |
bd5635a1 | 7 | it under the terms of the GNU General Public License as published by |
715d2e06 JG |
8 | the Free Software Foundation; either version 2 of the License, or |
9 | (at your option) any later version. | |
bd5635a1 | 10 | |
715d2e06 | 11 | This program is distributed in the hope that it will be useful, |
bd5635a1 RP |
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. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
715d2e06 JG |
17 | along with this program; if not, write to the Free Software |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
bd5635a1 | 19 | |
bd5635a1 | 20 | #include "defs.h" |
bd5635a1 RP |
21 | #include "frame.h" |
22 | #include "inferior.h" | |
23 | #include "command.h" | |
24 | #include "signals.h" | |
a88797b5 | 25 | #include "serial.h" |
a14a8fad | 26 | #include "terminal.h" |
bd5635a1 | 27 | #include "target.h" |
199b2450 | 28 | #include "thread.h" |
bd5635a1 | 29 | |
a14a8fad JK |
30 | #include <signal.h> |
31 | #include <fcntl.h> | |
32 | ||
33 | #if !defined (HAVE_TERMIOS) && !defined (HAVE_TERMIO) && !defined (HAVE_SGTTY) && !defined (__GO32__) | |
34 | #define HAVE_SGTTY | |
bd5635a1 RP |
35 | #endif |
36 | ||
a14a8fad JK |
37 | #if defined (HAVE_TERMIOS) |
38 | #include <termios.h> | |
39 | #include <unistd.h> | |
40 | #endif | |
bd5635a1 | 41 | |
a14a8fad JK |
42 | #ifdef HAVE_TERMIOS |
43 | #define PROCESS_GROUP_TYPE pid_t | |
44 | #endif | |
45 | ||
46 | #ifdef HAVE_SGTTY | |
47 | #ifdef SHORT_PGRP | |
48 | /* This is only used for the ultra. Does it have pid_t? */ | |
49 | #define PROCESS_GROUP_TYPE short | |
50 | #else | |
51 | #define PROCESS_GROUP_TYPE int | |
52 | #endif | |
53 | #endif /* sgtty */ | |
bd5635a1 | 54 | |
e676a15f FF |
55 | static void |
56 | kill_command PARAMS ((char *, int)); | |
57 | ||
58 | static void | |
59 | terminal_ours_1 PARAMS ((int)); | |
2a5ec41d | 60 | |
bd5635a1 RP |
61 | /* Nonzero if we are debugging an attached outside process |
62 | rather than an inferior. */ | |
63 | ||
64 | int attach_flag; | |
65 | ||
66 | \f | |
67 | /* Record terminal status separately for debugger and inferior. */ | |
68 | ||
a88797b5 | 69 | static serial_t stdin_serial; |
bd5635a1 | 70 | |
a88797b5 FF |
71 | /* TTY state for the inferior. We save it whenever the inferior stops, and |
72 | restore it when it resumes. */ | |
73 | static serial_ttystate inferior_ttystate; | |
bd5635a1 | 74 | |
a88797b5 FF |
75 | /* Our own tty state, which we restore every time we need to deal with the |
76 | terminal. We only set it once, when GDB first starts. The settings of | |
77 | flags which readline saves and restores and unimportant. */ | |
78 | static serial_ttystate our_ttystate; | |
bd5635a1 | 79 | |
a88797b5 FF |
80 | /* fcntl flags for us and the inferior. Saved and restored just like |
81 | {our,inferior}_ttystate. */ | |
82 | static int tflags_inferior; | |
83 | static int tflags_ours; | |
bd5635a1 | 84 | |
a14a8fad JK |
85 | #ifdef PROCESS_GROUP_TYPE |
86 | /* Process group for us and the inferior. Saved and restored just like | |
87 | {our,inferior}_ttystate. */ | |
88 | PROCESS_GROUP_TYPE our_process_group; | |
89 | PROCESS_GROUP_TYPE inferior_process_group; | |
90 | #endif | |
91 | ||
a88797b5 FF |
92 | /* While the inferior is running, we want SIGINT and SIGQUIT to go to the |
93 | inferior only. If we have job control, that takes care of it. If not, | |
94 | we save our handlers in these two variables and set SIGINT and SIGQUIT | |
95 | to SIG_IGN. */ | |
bd5635a1 RP |
96 | static void (*sigint_ours) (); |
97 | static void (*sigquit_ours) (); | |
bd5635a1 | 98 | |
2a5ec41d JG |
99 | /* The name of the tty (from the `tty' command) that we gave to the inferior |
100 | when it was last started. */ | |
bd5635a1 | 101 | |
2a5ec41d | 102 | static char *inferior_thisrun_terminal; |
bd5635a1 | 103 | |
49781499 JK |
104 | /* Nonzero if our terminal settings are in effect. Zero if the |
105 | inferior's settings are in effect. Ignored if !gdb_has_a_terminal | |
106 | (). */ | |
2a5ec41d | 107 | |
bd5635a1 RP |
108 | static int terminal_is_ours; |
109 | ||
a88797b5 FF |
110 | enum {yes, no, have_not_checked} gdb_has_a_terminal_flag = have_not_checked; |
111 | ||
112 | /* Does GDB have a terminal (on stdin)? */ | |
113 | int | |
114 | gdb_has_a_terminal () | |
115 | { | |
116 | switch (gdb_has_a_terminal_flag) | |
117 | { | |
118 | case yes: | |
119 | return 1; | |
120 | case no: | |
121 | return 0; | |
122 | case have_not_checked: | |
123 | /* Get all the current tty settings (including whether we have a tty at | |
124 | all!). Can't do this in _initialize_inflow because SERIAL_FDOPEN | |
125 | won't work until the serial_ops_list is initialized. */ | |
126 | ||
49781499 | 127 | #ifdef F_GETFL |
a88797b5 | 128 | tflags_ours = fcntl (0, F_GETFL, 0); |
49781499 | 129 | #endif |
a88797b5 FF |
130 | |
131 | gdb_has_a_terminal_flag = no; | |
132 | stdin_serial = SERIAL_FDOPEN (0); | |
133 | if (stdin_serial != NULL) | |
134 | { | |
135 | our_ttystate = SERIAL_GET_TTY_STATE (stdin_serial); | |
a14a8fad | 136 | |
a88797b5 | 137 | if (our_ttystate != NULL) |
a14a8fad JK |
138 | { |
139 | gdb_has_a_terminal_flag = yes; | |
140 | #ifdef HAVE_TERMIOS | |
141 | our_process_group = tcgetpgrp (0); | |
142 | #endif | |
143 | #ifdef HAVE_SGTTY | |
d76eb5f4 | 144 | ioctl (0, TIOCGPGRP, &our_process_group); |
a14a8fad JK |
145 | #endif |
146 | } | |
a88797b5 FF |
147 | } |
148 | ||
149 | return gdb_has_a_terminal_flag == yes; | |
199b2450 TL |
150 | default: |
151 | /* "Can't happen". */ | |
152 | return 0; | |
a88797b5 FF |
153 | } |
154 | } | |
155 | ||
2a5ec41d JG |
156 | /* Macro for printing errors from ioctl operations */ |
157 | ||
158 | #define OOPSY(what) \ | |
159 | if (result == -1) \ | |
199b2450 | 160 | fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \ |
2a5ec41d JG |
161 | what, strerror (errno)) |
162 | ||
a88797b5 | 163 | static void terminal_ours_1 PARAMS ((int)); |
2a5ec41d | 164 | |
bd5635a1 RP |
165 | /* Initialize the terminal settings we record for the inferior, |
166 | before we actually run the inferior. */ | |
167 | ||
168 | void | |
169 | terminal_init_inferior () | |
170 | { | |
49781499 JK |
171 | if (gdb_has_a_terminal ()) |
172 | { | |
173 | /* We could just as well copy our_ttystate (if we felt like adding | |
174 | a new function SERIAL_COPY_TTY_STATE). */ | |
175 | if (inferior_ttystate) | |
176 | free (inferior_ttystate); | |
177 | inferior_ttystate = SERIAL_GET_TTY_STATE (stdin_serial); | |
a14a8fad | 178 | #ifdef PROCESS_GROUP_TYPE |
5090e82c SG |
179 | #ifdef PIDGET /* XXX Lynx */ |
180 | inferior_process_group = PIDGET (inferior_pid); | |
181 | #else | |
a14a8fad | 182 | inferior_process_group = inferior_pid; |
5090e82c | 183 | #endif |
a14a8fad | 184 | #endif |
49781499 JK |
185 | |
186 | /* Make sure that next time we call terminal_inferior (which will be | |
187 | before the program runs, as it needs to be), we install the new | |
188 | process group. */ | |
189 | terminal_is_ours = 1; | |
190 | } | |
bd5635a1 RP |
191 | } |
192 | ||
193 | /* Put the inferior's terminal settings into effect. | |
194 | This is preparation for starting or resuming the inferior. */ | |
195 | ||
196 | void | |
197 | terminal_inferior () | |
198 | { | |
a88797b5 FF |
199 | if (gdb_has_a_terminal () && terminal_is_ours |
200 | && inferior_thisrun_terminal == 0) | |
bd5635a1 | 201 | { |
a88797b5 FF |
202 | int result; |
203 | ||
49781499 | 204 | #ifdef F_GETFL |
a88797b5 FF |
205 | /* Is there a reason this is being done twice? It happens both |
206 | places we use F_SETFL, so I'm inclined to think perhaps there | |
207 | is some reason, however perverse. Perhaps not though... */ | |
2a5ec41d JG |
208 | result = fcntl (0, F_SETFL, tflags_inferior); |
209 | result = fcntl (0, F_SETFL, tflags_inferior); | |
210 | OOPSY ("fcntl F_SETFL"); | |
49781499 | 211 | #endif |
bd5635a1 | 212 | |
a88797b5 FF |
213 | /* Because we were careful to not change in or out of raw mode in |
214 | terminal_ours, we will not change in our out of raw mode with | |
215 | this call, so we don't flush any input. */ | |
216 | result = SERIAL_SET_TTY_STATE (stdin_serial, inferior_ttystate); | |
a14a8fad JK |
217 | OOPSY ("setting tty state"); |
218 | ||
219 | if (!job_control) | |
220 | { | |
221 | sigint_ours = (void (*) ()) signal (SIGINT, SIG_IGN); | |
222 | sigquit_ours = (void (*) ()) signal (SIGQUIT, SIG_IGN); | |
223 | } | |
a88797b5 FF |
224 | |
225 | /* If attach_flag is set, we don't know whether we are sharing a | |
226 | terminal with the inferior or not. (attaching a process | |
227 | without a terminal is one case where we do not; attaching a | |
228 | process which we ran from the same shell as GDB via `&' is | |
229 | one case where we do, I think (but perhaps this is not | |
230 | `sharing' in the sense that we need to save and restore tty | |
231 | state)). I don't know if there is any way to tell whether we | |
232 | are sharing a terminal. So what we do is to go through all | |
a14a8fad JK |
233 | the saving and restoring of the tty state, but ignore errors |
234 | setting the process group, which will happen if we are not | |
235 | sharing a terminal). */ | |
a88797b5 | 236 | |
a14a8fad | 237 | if (job_control) |
a88797b5 | 238 | { |
a14a8fad JK |
239 | #ifdef HAVE_TERMIOS |
240 | result = tcsetpgrp (0, inferior_process_group); | |
241 | if (!attach_flag) | |
242 | OOPSY ("tcsetpgrp"); | |
243 | #endif | |
244 | ||
245 | #ifdef HAVE_SGTTY | |
179cd923 | 246 | result = ioctl (0, TIOCSPGRP, &inferior_process_group); |
a14a8fad JK |
247 | if (!attach_flag) |
248 | OOPSY ("TIOCSPGRP"); | |
249 | #endif | |
a88797b5 | 250 | } |
a14a8fad | 251 | |
bd5635a1 RP |
252 | } |
253 | terminal_is_ours = 0; | |
254 | } | |
255 | ||
256 | /* Put some of our terminal settings into effect, | |
257 | enough to get proper results from our output, | |
258 | but do not change into or out of RAW mode | |
259 | so that no input is discarded. | |
260 | ||
261 | After doing this, either terminal_ours or terminal_inferior | |
262 | should be called to get back to a normal state of affairs. */ | |
263 | ||
264 | void | |
265 | terminal_ours_for_output () | |
266 | { | |
267 | terminal_ours_1 (1); | |
268 | } | |
269 | ||
270 | /* Put our terminal settings into effect. | |
271 | First record the inferior's terminal settings | |
272 | so they can be restored properly later. */ | |
273 | ||
274 | void | |
275 | terminal_ours () | |
276 | { | |
277 | terminal_ours_1 (0); | |
278 | } | |
279 | ||
a88797b5 FF |
280 | /* output_only is not used, and should not be used unless we introduce |
281 | separate terminal_is_ours and terminal_is_ours_for_output | |
282 | flags. */ | |
283 | ||
bd5635a1 RP |
284 | static void |
285 | terminal_ours_1 (output_only) | |
286 | int output_only; | |
287 | { | |
2a5ec41d | 288 | /* Checking inferior_thisrun_terminal is necessary so that |
bd5635a1 | 289 | if GDB is running in the background, it won't block trying |
2a5ec41d JG |
290 | to do the ioctl()'s below. Checking gdb_has_a_terminal |
291 | avoids attempting all the ioctl's when running in batch. */ | |
a88797b5 | 292 | if (inferior_thisrun_terminal != 0 || gdb_has_a_terminal () == 0) |
bd5635a1 RP |
293 | return; |
294 | ||
295 | if (!terminal_is_ours) | |
296 | { | |
a88797b5 FF |
297 | /* Ignore this signal since it will happen when we try to set the |
298 | pgrp. */ | |
299 | void (*osigttou) (); | |
300 | int result; | |
301 | ||
bd5635a1 RP |
302 | terminal_is_ours = 1; |
303 | ||
a88797b5 FF |
304 | #ifdef SIGTTOU |
305 | if (job_control) | |
306 | osigttou = (void (*) ()) signal (SIGTTOU, SIG_IGN); | |
307 | #endif | |
bd5635a1 | 308 | |
a88797b5 FF |
309 | if (inferior_ttystate) |
310 | free (inferior_ttystate); | |
311 | inferior_ttystate = SERIAL_GET_TTY_STATE (stdin_serial); | |
a14a8fad JK |
312 | #ifdef HAVE_TERMIOS |
313 | inferior_process_group = tcgetpgrp (0); | |
314 | #endif | |
315 | #ifdef HAVE_SGTTY | |
d76eb5f4 | 316 | ioctl (0, TIOCGPGRP, &inferior_process_group); |
a14a8fad | 317 | #endif |
bd5635a1 | 318 | |
a88797b5 FF |
319 | /* Here we used to set ICANON in our ttystate, but I believe this |
320 | was an artifact from before when we used readline. Readline sets | |
321 | the tty state when it needs to. */ | |
bd5635a1 | 322 | |
a88797b5 FF |
323 | /* Set tty state to our_ttystate. We don't change in our out of raw |
324 | mode, to avoid flushing input. We need to do the same thing | |
325 | regardless of output_only, because we don't have separate | |
326 | terminal_is_ours and terminal_is_ours_for_output flags. It's OK, | |
327 | though, since readline will deal with raw mode when/if it needs to. | |
328 | */ | |
329 | SERIAL_NOFLUSH_SET_TTY_STATE (stdin_serial, our_ttystate, | |
330 | inferior_ttystate); | |
bd5635a1 | 331 | |
a14a8fad JK |
332 | if (job_control) |
333 | { | |
334 | #ifdef HAVE_TERMIOS | |
335 | result = tcsetpgrp (0, our_process_group); | |
76e473bb JK |
336 | #if 0 |
337 | /* This fails on Ultrix with EINVAL if you run the testsuite | |
338 | in the background with nohup, and then log out. GDB never | |
339 | used to check for an error here, so perhaps there are other | |
340 | such situations as well. */ | |
d76eb5f4 | 341 | if (result == -1) |
199b2450 | 342 | fprintf_unfiltered (gdb_stderr, "[tcsetpgrp failed in terminal_ours: %s]\n", |
d76eb5f4 | 343 | strerror (errno)); |
a14a8fad | 344 | #endif |
76e473bb | 345 | #endif /* termios */ |
a14a8fad JK |
346 | |
347 | #ifdef HAVE_SGTTY | |
179cd923 | 348 | result = ioctl (0, TIOCSPGRP, &our_process_group); |
a14a8fad JK |
349 | #endif |
350 | } | |
351 | ||
a88797b5 FF |
352 | #ifdef SIGTTOU |
353 | if (job_control) | |
354 | signal (SIGTTOU, osigttou); | |
bd5635a1 | 355 | #endif |
bd5635a1 | 356 | |
a88797b5 FF |
357 | if (!job_control) |
358 | { | |
359 | signal (SIGINT, sigint_ours); | |
360 | signal (SIGQUIT, sigquit_ours); | |
361 | } | |
bd5635a1 | 362 | |
49781499 | 363 | #ifdef F_GETFL |
a88797b5 | 364 | tflags_inferior = fcntl (0, F_GETFL, 0); |
e676a15f | 365 | |
a88797b5 FF |
366 | /* Is there a reason this is being done twice? It happens both |
367 | places we use F_SETFL, so I'm inclined to think perhaps there | |
368 | is some reason, however perverse. Perhaps not though... */ | |
369 | result = fcntl (0, F_SETFL, tflags_ours); | |
370 | result = fcntl (0, F_SETFL, tflags_ours); | |
49781499 | 371 | #endif |
a88797b5 FF |
372 | |
373 | result = result; /* lint */ | |
374 | } | |
bd5635a1 RP |
375 | } |
376 | ||
377 | /* ARGSUSED */ | |
378 | void | |
379 | term_info (arg, from_tty) | |
380 | char *arg; | |
381 | int from_tty; | |
382 | { | |
383 | target_terminal_info (arg, from_tty); | |
384 | } | |
385 | ||
715d2e06 | 386 | /* ARGSUSED */ |
bd5635a1 RP |
387 | void |
388 | child_terminal_info (args, from_tty) | |
389 | char *args; | |
390 | int from_tty; | |
391 | { | |
a88797b5 FF |
392 | if (!gdb_has_a_terminal ()) |
393 | { | |
394 | printf_filtered ("This GDB does not control a terminal.\n"); | |
395 | return; | |
396 | } | |
bd5635a1 RP |
397 | |
398 | printf_filtered ("Inferior's terminal status (currently saved by GDB):\n"); | |
399 | ||
a88797b5 FF |
400 | /* First the fcntl flags. */ |
401 | { | |
402 | int flags; | |
403 | ||
404 | flags = tflags_inferior; | |
bd5635a1 | 405 | |
a88797b5 | 406 | printf_filtered ("File descriptor flags = "); |
bd5635a1 | 407 | |
a88797b5 FF |
408 | #ifndef O_ACCMODE |
409 | #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR) | |
bd5635a1 | 410 | #endif |
a88797b5 FF |
411 | /* (O_ACCMODE) parens are to avoid Ultrix header file bug */ |
412 | switch (flags & (O_ACCMODE)) | |
413 | { | |
414 | case O_RDONLY: printf_filtered ("O_RDONLY"); break; | |
415 | case O_WRONLY: printf_filtered ("O_WRONLY"); break; | |
416 | case O_RDWR: printf_filtered ("O_RDWR"); break; | |
417 | } | |
418 | flags &= ~(O_ACCMODE); | |
bd5635a1 | 419 | |
a88797b5 FF |
420 | #ifdef O_NONBLOCK |
421 | if (flags & O_NONBLOCK) | |
422 | printf_filtered (" | O_NONBLOCK"); | |
423 | flags &= ~O_NONBLOCK; | |
bd5635a1 | 424 | #endif |
a88797b5 FF |
425 | |
426 | #if defined (O_NDELAY) | |
427 | /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will | |
428 | print it as O_NONBLOCK, which is good cause that is what POSIX | |
429 | has, and the flag will already be cleared by the time we get here. */ | |
430 | if (flags & O_NDELAY) | |
431 | printf_filtered (" | O_NDELAY"); | |
432 | flags &= ~O_NDELAY; | |
bd5635a1 | 433 | #endif |
a88797b5 FF |
434 | |
435 | if (flags & O_APPEND) | |
436 | printf_filtered (" | O_APPEND"); | |
437 | flags &= ~O_APPEND; | |
438 | ||
439 | #if defined (O_BINARY) | |
440 | if (flags & O_BINARY) | |
441 | printf_filtered (" | O_BINARY"); | |
442 | flags &= ~O_BINARY; | |
e676a15f FF |
443 | #endif |
444 | ||
a88797b5 FF |
445 | if (flags) |
446 | printf_filtered (" | 0x%x", flags); | |
447 | printf_filtered ("\n"); | |
448 | } | |
449 | ||
a14a8fad JK |
450 | #ifdef PROCESS_GROUP_TYPE |
451 | printf_filtered ("Process group = %d\n", inferior_process_group); | |
452 | #endif | |
453 | ||
a88797b5 | 454 | SERIAL_PRINT_TTY_STATE (stdin_serial, inferior_ttystate); |
bd5635a1 RP |
455 | } |
456 | \f | |
715d2e06 JG |
457 | /* NEW_TTY_PREFORK is called before forking a new child process, |
458 | so we can record the state of ttys in the child to be formed. | |
459 | TTYNAME is null if we are to share the terminal with gdb; | |
460 | or points to a string containing the name of the desired tty. | |
bd5635a1 | 461 | |
715d2e06 JG |
462 | NEW_TTY is called in new child processes under Unix, which will |
463 | become debugger target processes. This actually switches to | |
464 | the terminal specified in the NEW_TTY_PREFORK call. */ | |
465 | ||
7d9884b9 | 466 | void |
715d2e06 | 467 | new_tty_prefork (ttyname) |
bd5635a1 RP |
468 | char *ttyname; |
469 | { | |
bd5635a1 RP |
470 | /* Save the name for later, for determining whether we and the child |
471 | are sharing a tty. */ | |
472 | inferior_thisrun_terminal = ttyname; | |
715d2e06 JG |
473 | } |
474 | ||
475 | void | |
476 | new_tty () | |
477 | { | |
478 | register int tty; | |
479 | ||
480 | if (inferior_thisrun_terminal == 0) | |
bd5635a1 | 481 | return; |
e676a15f | 482 | #if !defined(__GO32__) |
bd5635a1 | 483 | #ifdef TIOCNOTTY |
e676a15f FF |
484 | /* Disconnect the child process from our controlling terminal. On some |
485 | systems (SVR4 for example), this may cause a SIGTTOU, so temporarily | |
486 | ignore SIGTTOU. */ | |
bd5635a1 RP |
487 | tty = open("/dev/tty", O_RDWR); |
488 | if (tty > 0) | |
489 | { | |
49781499 JK |
490 | void (*osigttou) (); |
491 | ||
e676a15f | 492 | osigttou = (void (*)()) signal(SIGTTOU, SIG_IGN); |
bd5635a1 RP |
493 | ioctl(tty, TIOCNOTTY, 0); |
494 | close(tty); | |
a88797b5 | 495 | signal(SIGTTOU, osigttou); |
bd5635a1 RP |
496 | } |
497 | #endif | |
498 | ||
499 | /* Now open the specified new terminal. */ | |
500 | ||
7d9884b9 JG |
501 | #ifdef USE_O_NOCTTY |
502 | tty = open(inferior_thisrun_terminal, O_RDWR | O_NOCTTY); | |
503 | #else | |
715d2e06 | 504 | tty = open(inferior_thisrun_terminal, O_RDWR); |
7d9884b9 | 505 | #endif |
bd5635a1 RP |
506 | if (tty == -1) |
507 | { | |
715d2e06 | 508 | print_sys_errmsg (inferior_thisrun_terminal, errno); |
bd5635a1 RP |
509 | _exit(1); |
510 | } | |
511 | ||
512 | /* Avoid use of dup2; doesn't exist on all systems. */ | |
513 | if (tty != 0) | |
514 | { close (0); dup (tty); } | |
515 | if (tty != 1) | |
516 | { close (1); dup (tty); } | |
517 | if (tty != 2) | |
518 | { close (2); dup (tty); } | |
519 | if (tty > 2) | |
520 | close(tty); | |
a88797b5 | 521 | #endif /* !go32 */ |
bd5635a1 RP |
522 | } |
523 | \f | |
524 | /* Kill the inferior process. Make us have no inferior. */ | |
525 | ||
526 | /* ARGSUSED */ | |
527 | static void | |
528 | kill_command (arg, from_tty) | |
529 | char *arg; | |
530 | int from_tty; | |
531 | { | |
a88797b5 | 532 | /* Shouldn't this be target_has_execution? FIXME. */ |
bd5635a1 RP |
533 | if (inferior_pid == 0) |
534 | error ("The program is not being run."); | |
a88797b5 | 535 | if (!query ("Kill the program being debugged? ")) |
bd5635a1 | 536 | error ("Not confirmed."); |
ee0613d1 | 537 | target_kill (); |
777bef06 | 538 | |
199b2450 TL |
539 | init_thread_list(); /* Destroy thread info */ |
540 | ||
777bef06 JK |
541 | /* Killing off the inferior can leave us with a core file. If so, |
542 | print the state we are left in. */ | |
543 | if (target_has_stack) { | |
544 | printf_filtered ("In %s,\n", current_target->to_longname); | |
545 | if (selected_frame == NULL) | |
199b2450 | 546 | fputs_filtered ("No selected stack frame.\n", gdb_stdout); |
777bef06 | 547 | else |
cadbb07a | 548 | print_stack_frame (selected_frame, selected_frame_level, 1); |
777bef06 | 549 | } |
bd5635a1 RP |
550 | } |
551 | ||
552 | /* The inferior process has died. Long live the inferior! */ | |
553 | ||
554 | void | |
555 | generic_mourn_inferior () | |
556 | { | |
557 | inferior_pid = 0; | |
558 | attach_flag = 0; | |
cf3e377e | 559 | breakpoint_init_inferior (); |
bd5635a1 RP |
560 | registers_changed (); |
561 | ||
562 | #ifdef CLEAR_DEFERRED_STORES | |
563 | /* Delete any pending stores to the inferior... */ | |
564 | CLEAR_DEFERRED_STORES; | |
565 | #endif | |
566 | ||
bd5635a1 | 567 | reopen_exec_file (); |
cf3e377e JK |
568 | reinit_frame_cache (); |
569 | ||
bd5635a1 RP |
570 | /* It is confusing to the user for ignore counts to stick around |
571 | from previous runs of the inferior. So clear them. */ | |
572 | breakpoint_clear_ignore_counts (); | |
573 | } | |
bd5635a1 | 574 | \f |
a88797b5 FF |
575 | /* Call set_sigint_trap when you need to pass a signal on to an attached |
576 | process when handling SIGINT */ | |
577 | ||
bd5635a1 RP |
578 | /* ARGSUSED */ |
579 | static void | |
a88797b5 FF |
580 | pass_signal (signo) |
581 | int signo; | |
bd5635a1 | 582 | { |
a88797b5 FF |
583 | kill (inferior_pid, SIGINT); |
584 | } | |
bd5635a1 | 585 | |
a88797b5 FF |
586 | static void (*osig)(); |
587 | ||
588 | void | |
589 | set_sigint_trap() | |
590 | { | |
591 | osig = (void (*) ()) signal (SIGINT, pass_signal); | |
592 | } | |
593 | ||
594 | void | |
595 | clear_sigint_trap() | |
596 | { | |
597 | signal (SIGINT, osig); | |
bd5635a1 | 598 | } |
bd5635a1 | 599 | \f |
a14a8fad JK |
600 | |
601 | int job_control; | |
602 | ||
603 | /* This is here because this is where we figure out whether we (probably) | |
604 | have job control. Just using job_control only does part of it because | |
605 | setpgid or setpgrp might not exist on a system without job control. | |
606 | It might be considered misplaced (on the other hand, process groups and | |
607 | job control are closely related to ttys). | |
608 | ||
609 | For a more clean implementation, in libiberty, put a setpgid which merely | |
610 | calls setpgrp and a setpgrp which does nothing (any system with job control | |
611 | will have one or the other). */ | |
612 | int | |
613 | gdb_setpgid () | |
614 | { | |
615 | int retval = 0; | |
616 | if (job_control) | |
617 | { | |
618 | #if defined (NEED_POSIX_SETPGID) || defined (HAVE_TERMIOS) | |
619 | /* Do all systems with termios have setpgid? I hope so. */ | |
620 | /* setpgid (0, 0) is supposed to work and mean the same thing as | |
621 | this, but on Ultrix 4.2A it fails with EPERM (and | |
622 | setpgid (getpid (), getpid ()) succeeds). */ | |
623 | retval = setpgid (getpid (), getpid ()); | |
624 | #else | |
625 | #if defined (TIOCGPGRP) | |
626 | #if defined(USG) && !defined(SETPGRP_ARGS) | |
627 | retval = setpgrp (); | |
628 | #else | |
629 | retval = setpgrp (getpid (), getpid ()); | |
630 | #endif /* USG */ | |
631 | #endif /* TIOCGPGRP. */ | |
632 | #endif /* NEED_POSIX_SETPGID */ | |
633 | } | |
634 | return retval; | |
635 | } | |
636 | ||
bd5635a1 RP |
637 | void |
638 | _initialize_inflow () | |
639 | { | |
640 | add_info ("terminal", term_info, | |
641 | "Print inferior's saved terminal status."); | |
642 | ||
bd5635a1 RP |
643 | add_com ("kill", class_run, kill_command, |
644 | "Kill execution of program being debugged."); | |
645 | ||
646 | inferior_pid = 0; | |
647 | ||
bd5635a1 | 648 | terminal_is_ours = 1; |
a14a8fad JK |
649 | |
650 | /* OK, figure out whether we have job control. If neither termios nor | |
651 | sgtty (i.e. termio or go32), leave job_control 0. */ | |
652 | ||
653 | #if defined (HAVE_TERMIOS) | |
654 | /* Do all systems with termios have the POSIX way of identifying job | |
655 | control? I hope so. */ | |
656 | #ifdef _POSIX_JOB_CONTROL | |
657 | job_control = 1; | |
658 | #else | |
659 | job_control = sysconf (_SC_JOB_CONTROL); | |
660 | #endif | |
661 | #endif /* termios */ | |
662 | ||
663 | #ifdef HAVE_SGTTY | |
664 | #ifdef TIOCGPGRP | |
665 | job_control = 1; | |
666 | #else | |
667 | job_control = 0; | |
668 | #endif /* TIOCGPGRP */ | |
669 | #endif /* sgtty */ | |
bd5635a1 | 670 | } |