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c906108c
SS
1/* Low level interface to ptrace, for GDB when running under Unix.
2 Copyright 1986-87, 1989, 1991-92, 1995, 1998 Free Software Foundation, Inc.
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
8 the Free Software Foundation; either version 2 of the License, or
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
JM
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
c906108c
SS
20
21#include "defs.h"
22#include "frame.h"
23#include "inferior.h"
24#include "command.h"
25#include "signals.h"
26#include "serial.h"
27#include "terminal.h"
28#include "target.h"
29#include "gdbthread.h"
30
31#include "gdb_string.h"
32#include <signal.h>
33#include <fcntl.h>
7a292a7a
SS
34#ifdef HAVE_SYS_SELECT_H
35#include <sys/select.h>
36#endif
c906108c
SS
37
38#ifdef HAVE_TERMIOS
39#define PROCESS_GROUP_TYPE pid_t
40#endif
41
42#ifdef HAVE_TERMIO
43#define PROCESS_GROUP_TYPE int
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 */
54
55#if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN)
56static void
57handle_sigio PARAMS ((int));
58#endif
59
392a587b
JM
60extern void _initialize_inflow PARAMS ((void));
61
c906108c
SS
62static void
63pass_signal PARAMS ((int));
64
65static void
66kill_command PARAMS ((char *, int));
67
68static void
69terminal_ours_1 PARAMS ((int));
70\f
71/* Record terminal status separately for debugger and inferior. */
72
73static serial_t stdin_serial;
74
75/* TTY state for the inferior. We save it whenever the inferior stops, and
76 restore it when it resumes. */
77static serial_ttystate inferior_ttystate;
78
79/* Our own tty state, which we restore every time we need to deal with the
80 terminal. We only set it once, when GDB first starts. The settings of
81 flags which readline saves and restores and unimportant. */
82static serial_ttystate our_ttystate;
83
84/* fcntl flags for us and the inferior. Saved and restored just like
85 {our,inferior}_ttystate. */
86static int tflags_inferior;
87static int tflags_ours;
88
89#ifdef PROCESS_GROUP_TYPE
90/* Process group for us and the inferior. Saved and restored just like
91 {our,inferior}_ttystate. */
92PROCESS_GROUP_TYPE our_process_group;
93PROCESS_GROUP_TYPE inferior_process_group;
94#endif
95
96/* While the inferior is running, we want SIGINT and SIGQUIT to go to the
97 inferior only. If we have job control, that takes care of it. If not,
98 we save our handlers in these two variables and set SIGINT and SIGQUIT
99 to SIG_IGN. */
100
101static void (*sigint_ours) ();
102static void (*sigquit_ours) ();
103
104/* The name of the tty (from the `tty' command) that we gave to the inferior
105 when it was last started. */
106
107static char *inferior_thisrun_terminal;
108
109/* Nonzero if our terminal settings are in effect. Zero if the
110 inferior's settings are in effect. Ignored if !gdb_has_a_terminal
111 (). */
112
113int terminal_is_ours;
114
c5aa993b
JM
115enum
116 {
117 yes, no, have_not_checked
118 }
119gdb_has_a_terminal_flag = have_not_checked;
c906108c
SS
120
121/* Does GDB have a terminal (on stdin)? */
122int
123gdb_has_a_terminal ()
124{
125 switch (gdb_has_a_terminal_flag)
126 {
127 case yes:
128 return 1;
129 case no:
130 return 0;
131 case have_not_checked:
132 /* Get all the current tty settings (including whether we have a tty at
c5aa993b
JM
133 all!). Can't do this in _initialize_inflow because SERIAL_FDOPEN
134 won't work until the serial_ops_list is initialized. */
c906108c
SS
135
136#ifdef F_GETFL
137 tflags_ours = fcntl (0, F_GETFL, 0);
138#endif
139
140 gdb_has_a_terminal_flag = no;
141 stdin_serial = SERIAL_FDOPEN (0);
142 if (stdin_serial != NULL)
143 {
144 our_ttystate = SERIAL_GET_TTY_STATE (stdin_serial);
145
146 if (our_ttystate != NULL)
147 {
148 gdb_has_a_terminal_flag = yes;
149#ifdef HAVE_TERMIOS
150 our_process_group = tcgetpgrp (0);
151#endif
152#ifdef HAVE_TERMIO
153 our_process_group = getpgrp ();
154#endif
155#ifdef HAVE_SGTTY
156 ioctl (0, TIOCGPGRP, &our_process_group);
157#endif
158 }
159 }
160
161 return gdb_has_a_terminal_flag == yes;
162 default:
163 /* "Can't happen". */
164 return 0;
165 }
166}
167
168/* Macro for printing errors from ioctl operations */
169
170#define OOPSY(what) \
171 if (result == -1) \
172 fprintf_unfiltered(gdb_stderr, "[%s failed in terminal_inferior: %s]\n", \
173 what, strerror (errno))
174
175static void terminal_ours_1 PARAMS ((int));
176
177/* Initialize the terminal settings we record for the inferior,
178 before we actually run the inferior. */
179
180void
181terminal_init_inferior_with_pgrp (pgrp)
182 int pgrp;
183{
184 if (gdb_has_a_terminal ())
185 {
186 /* We could just as well copy our_ttystate (if we felt like adding
c5aa993b 187 a new function SERIAL_COPY_TTY_STATE). */
c906108c
SS
188 if (inferior_ttystate)
189 free (inferior_ttystate);
190 inferior_ttystate = SERIAL_GET_TTY_STATE (stdin_serial);
191
192#ifdef PROCESS_GROUP_TYPE
193 inferior_process_group = pgrp;
194#endif
195
196 /* Make sure that next time we call terminal_inferior (which will be
c5aa993b
JM
197 before the program runs, as it needs to be), we install the new
198 process group. */
c906108c
SS
199 terminal_is_ours = 1;
200 }
201}
202
203void
204terminal_init_inferior ()
205{
206#ifdef PROCESS_GROUP_TYPE
207 /* This is for Lynx, and should be cleaned up by having Lynx be a separate
208 debugging target with a version of target_terminal_init_inferior which
209 passes in the process group to a generic routine which does all the work
210 (and the non-threaded child_terminal_init_inferior can just pass in
211 inferior_pid to the same routine). */
212 /* We assume INFERIOR_PID is also the child's process group. */
213 terminal_init_inferior_with_pgrp (PIDGET (inferior_pid));
214#endif /* PROCESS_GROUP_TYPE */
215}
216
217/* Put the inferior's terminal settings into effect.
218 This is preparation for starting or resuming the inferior. */
219
220void
221terminal_inferior ()
222{
223 if (gdb_has_a_terminal () && terminal_is_ours
224 && inferior_thisrun_terminal == 0)
225 {
226 int result;
227
228#ifdef F_GETFL
229 /* Is there a reason this is being done twice? It happens both
c5aa993b
JM
230 places we use F_SETFL, so I'm inclined to think perhaps there
231 is some reason, however perverse. Perhaps not though... */
c906108c
SS
232 result = fcntl (0, F_SETFL, tflags_inferior);
233 result = fcntl (0, F_SETFL, tflags_inferior);
234 OOPSY ("fcntl F_SETFL");
235#endif
236
237 /* Because we were careful to not change in or out of raw mode in
c5aa993b
JM
238 terminal_ours, we will not change in our out of raw mode with
239 this call, so we don't flush any input. */
c906108c
SS
240 result = SERIAL_SET_TTY_STATE (stdin_serial, inferior_ttystate);
241 OOPSY ("setting tty state");
242
243 if (!job_control)
244 {
c5aa993b 245 sigint_ours = (void (*)()) signal (SIGINT, SIG_IGN);
c906108c 246#ifdef SIGQUIT
c5aa993b 247 sigquit_ours = (void (*)()) signal (SIGQUIT, SIG_IGN);
c906108c
SS
248#endif
249 }
250
251 /* If attach_flag is set, we don't know whether we are sharing a
c5aa993b
JM
252 terminal with the inferior or not. (attaching a process
253 without a terminal is one case where we do not; attaching a
254 process which we ran from the same shell as GDB via `&' is
255 one case where we do, I think (but perhaps this is not
256 `sharing' in the sense that we need to save and restore tty
257 state)). I don't know if there is any way to tell whether we
258 are sharing a terminal. So what we do is to go through all
259 the saving and restoring of the tty state, but ignore errors
260 setting the process group, which will happen if we are not
261 sharing a terminal). */
c906108c
SS
262
263 if (job_control)
264 {
265#ifdef HAVE_TERMIOS
266 result = tcsetpgrp (0, inferior_process_group);
267 if (!attach_flag)
268 OOPSY ("tcsetpgrp");
269#endif
270
271#ifdef HAVE_SGTTY
272 result = ioctl (0, TIOCSPGRP, &inferior_process_group);
273 if (!attach_flag)
274 OOPSY ("TIOCSPGRP");
275#endif
276 }
277
278 }
279 terminal_is_ours = 0;
280}
281
282/* Put some of our terminal settings into effect,
283 enough to get proper results from our output,
284 but do not change into or out of RAW mode
285 so that no input is discarded.
286
287 After doing this, either terminal_ours or terminal_inferior
288 should be called to get back to a normal state of affairs. */
289
290void
291terminal_ours_for_output ()
292{
293 terminal_ours_1 (1);
294}
295
296/* Put our terminal settings into effect.
297 First record the inferior's terminal settings
298 so they can be restored properly later. */
299
300void
301terminal_ours ()
302{
303 terminal_ours_1 (0);
304}
305
306/* output_only is not used, and should not be used unless we introduce
307 separate terminal_is_ours and terminal_is_ours_for_output
308 flags. */
309
310static void
311terminal_ours_1 (output_only)
312 int output_only;
313{
314 /* Checking inferior_thisrun_terminal is necessary so that
315 if GDB is running in the background, it won't block trying
316 to do the ioctl()'s below. Checking gdb_has_a_terminal
317 avoids attempting all the ioctl's when running in batch. */
318 if (inferior_thisrun_terminal != 0 || gdb_has_a_terminal () == 0)
319 return;
320
321 if (!terminal_is_ours)
322 {
323 /* Ignore this signal since it will happen when we try to set the
c5aa993b 324 pgrp. */
c906108c
SS
325 void (*osigttou) ();
326 int result;
327
328 terminal_is_ours = 1;
329
330#ifdef SIGTTOU
331 if (job_control)
c5aa993b 332 osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN);
c906108c
SS
333#endif
334
335 if (inferior_ttystate)
336 free (inferior_ttystate);
337 inferior_ttystate = SERIAL_GET_TTY_STATE (stdin_serial);
338#ifdef HAVE_TERMIOS
339 inferior_process_group = tcgetpgrp (0);
340#endif
341#ifdef HAVE_TERMIO
342 inferior_process_group = getpgrp ();
343#endif
344#ifdef HAVE_SGTTY
345 ioctl (0, TIOCGPGRP, &inferior_process_group);
346#endif
347
348 /* Here we used to set ICANON in our ttystate, but I believe this
c5aa993b
JM
349 was an artifact from before when we used readline. Readline sets
350 the tty state when it needs to.
351 FIXME-maybe: However, query() expects non-raw mode and doesn't
352 use readline. Maybe query should use readline (on the other hand,
353 this only matters for HAVE_SGTTY, not termio or termios, I think). */
c906108c
SS
354
355 /* Set tty state to our_ttystate. We don't change in our out of raw
c5aa993b
JM
356 mode, to avoid flushing input. We need to do the same thing
357 regardless of output_only, because we don't have separate
358 terminal_is_ours and terminal_is_ours_for_output flags. It's OK,
359 though, since readline will deal with raw mode when/if it needs to.
360 */
c906108c
SS
361
362 SERIAL_NOFLUSH_SET_TTY_STATE (stdin_serial, our_ttystate,
363 inferior_ttystate);
364
365 if (job_control)
366 {
367#ifdef HAVE_TERMIOS
368 result = tcsetpgrp (0, our_process_group);
369#if 0
370 /* This fails on Ultrix with EINVAL if you run the testsuite
371 in the background with nohup, and then log out. GDB never
372 used to check for an error here, so perhaps there are other
373 such situations as well. */
374 if (result == -1)
375 fprintf_unfiltered (gdb_stderr, "[tcsetpgrp failed in terminal_ours: %s]\n",
c5aa993b 376 strerror (errno));
c906108c
SS
377#endif
378#endif /* termios */
379
380#ifdef HAVE_SGTTY
381 result = ioctl (0, TIOCSPGRP, &our_process_group);
382#endif
383 }
384
385#ifdef SIGTTOU
386 if (job_control)
387 signal (SIGTTOU, osigttou);
388#endif
389
390 if (!job_control)
391 {
392 signal (SIGINT, sigint_ours);
393#ifdef SIGQUIT
394 signal (SIGQUIT, sigquit_ours);
395#endif
396 }
397
398#ifdef F_GETFL
399 tflags_inferior = fcntl (0, F_GETFL, 0);
400
401 /* Is there a reason this is being done twice? It happens both
c5aa993b
JM
402 places we use F_SETFL, so I'm inclined to think perhaps there
403 is some reason, however perverse. Perhaps not though... */
c906108c
SS
404 result = fcntl (0, F_SETFL, tflags_ours);
405 result = fcntl (0, F_SETFL, tflags_ours);
406#endif
407
c5aa993b 408 result = result; /* lint */
c906108c
SS
409 }
410}
411
412/* ARGSUSED */
413void
414term_info (arg, from_tty)
415 char *arg;
416 int from_tty;
417{
418 target_terminal_info (arg, from_tty);
419}
420
421/* ARGSUSED */
422void
423child_terminal_info (args, from_tty)
424 char *args;
425 int from_tty;
426{
427 if (!gdb_has_a_terminal ())
428 {
429 printf_filtered ("This GDB does not control a terminal.\n");
430 return;
431 }
432
433 printf_filtered ("Inferior's terminal status (currently saved by GDB):\n");
434
435 /* First the fcntl flags. */
436 {
437 int flags;
c5aa993b 438
c906108c
SS
439 flags = tflags_inferior;
440
441 printf_filtered ("File descriptor flags = ");
442
443#ifndef O_ACCMODE
444#define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR)
445#endif
446 /* (O_ACCMODE) parens are to avoid Ultrix header file bug */
447 switch (flags & (O_ACCMODE))
448 {
c5aa993b
JM
449 case O_RDONLY:
450 printf_filtered ("O_RDONLY");
451 break;
452 case O_WRONLY:
453 printf_filtered ("O_WRONLY");
454 break;
455 case O_RDWR:
456 printf_filtered ("O_RDWR");
457 break;
c906108c
SS
458 }
459 flags &= ~(O_ACCMODE);
460
461#ifdef O_NONBLOCK
c5aa993b 462 if (flags & O_NONBLOCK)
c906108c
SS
463 printf_filtered (" | O_NONBLOCK");
464 flags &= ~O_NONBLOCK;
465#endif
c5aa993b 466
c906108c
SS
467#if defined (O_NDELAY)
468 /* If O_NDELAY and O_NONBLOCK are defined to the same thing, we will
469 print it as O_NONBLOCK, which is good cause that is what POSIX
470 has, and the flag will already be cleared by the time we get here. */
471 if (flags & O_NDELAY)
472 printf_filtered (" | O_NDELAY");
473 flags &= ~O_NDELAY;
474#endif
475
476 if (flags & O_APPEND)
477 printf_filtered (" | O_APPEND");
478 flags &= ~O_APPEND;
479
480#if defined (O_BINARY)
481 if (flags & O_BINARY)
482 printf_filtered (" | O_BINARY");
483 flags &= ~O_BINARY;
484#endif
485
486 if (flags)
487 printf_filtered (" | 0x%x", flags);
488 printf_filtered ("\n");
489 }
490
491#ifdef PROCESS_GROUP_TYPE
2acceee2
JM
492 printf_filtered ("Process group = %d\n",
493 (int) inferior_process_group);
c906108c
SS
494#endif
495
c2c6d25f 496 SERIAL_PRINT_TTY_STATE (stdin_serial, inferior_ttystate, gdb_stdout);
c906108c
SS
497}
498\f
499/* NEW_TTY_PREFORK is called before forking a new child process,
500 so we can record the state of ttys in the child to be formed.
501 TTYNAME is null if we are to share the terminal with gdb;
502 or points to a string containing the name of the desired tty.
503
504 NEW_TTY is called in new child processes under Unix, which will
505 become debugger target processes. This actually switches to
506 the terminal specified in the NEW_TTY_PREFORK call. */
507
508void
509new_tty_prefork (ttyname)
510 char *ttyname;
511{
512 /* Save the name for later, for determining whether we and the child
513 are sharing a tty. */
514 inferior_thisrun_terminal = ttyname;
515}
516
517void
518new_tty ()
519{
520 register int tty;
521
522 if (inferior_thisrun_terminal == 0)
523 return;
524#if !defined(__GO32__) && !defined(_WIN32)
525#ifdef TIOCNOTTY
526 /* Disconnect the child process from our controlling terminal. On some
527 systems (SVR4 for example), this may cause a SIGTTOU, so temporarily
528 ignore SIGTTOU. */
c5aa993b 529 tty = open ("/dev/tty", O_RDWR);
c906108c
SS
530 if (tty > 0)
531 {
532 void (*osigttou) ();
533
c5aa993b
JM
534 osigttou = (void (*)()) signal (SIGTTOU, SIG_IGN);
535 ioctl (tty, TIOCNOTTY, 0);
536 close (tty);
537 signal (SIGTTOU, osigttou);
c906108c
SS
538 }
539#endif
540
541 /* Now open the specified new terminal. */
542
543#ifdef USE_O_NOCTTY
c5aa993b 544 tty = open (inferior_thisrun_terminal, O_RDWR | O_NOCTTY);
c906108c 545#else
c5aa993b 546 tty = open (inferior_thisrun_terminal, O_RDWR);
c906108c
SS
547#endif
548 if (tty == -1)
549 {
550 print_sys_errmsg (inferior_thisrun_terminal, errno);
c5aa993b 551 _exit (1);
c906108c
SS
552 }
553
554 /* Avoid use of dup2; doesn't exist on all systems. */
555 if (tty != 0)
c5aa993b
JM
556 {
557 close (0);
558 dup (tty);
559 }
c906108c 560 if (tty != 1)
c5aa993b
JM
561 {
562 close (1);
563 dup (tty);
564 }
c906108c 565 if (tty != 2)
c5aa993b
JM
566 {
567 close (2);
568 dup (tty);
569 }
c906108c 570 if (tty > 2)
c5aa993b
JM
571 close (tty);
572#endif /* !go32 && !win32 */
c906108c
SS
573}
574\f
575/* Kill the inferior process. Make us have no inferior. */
576
577/* ARGSUSED */
578static void
579kill_command (arg, from_tty)
580 char *arg;
581 int from_tty;
582{
583 /* FIXME: This should not really be inferior_pid (or target_has_execution).
584 It should be a distinct flag that indicates that a target is active, cuz
585 some targets don't have processes! */
586
587 if (inferior_pid == 0)
588 error ("The program is not being run.");
589 if (!query ("Kill the program being debugged? "))
590 error ("Not confirmed.");
591 target_kill ();
592
c5aa993b 593 init_thread_list (); /* Destroy thread info */
c906108c
SS
594
595 /* Killing off the inferior can leave us with a core file. If so,
596 print the state we are left in. */
c5aa993b
JM
597 if (target_has_stack)
598 {
599 printf_filtered ("In %s,\n", target_longname);
600 if (selected_frame == NULL)
601 fputs_filtered ("No selected stack frame.\n", gdb_stdout);
602 else
603 print_stack_frame (selected_frame, selected_frame_level, 1);
604 }
c906108c
SS
605}
606\f
607/* Call set_sigint_trap when you need to pass a signal on to an attached
608 process when handling SIGINT */
609
610/* ARGSUSED */
611static void
612pass_signal (signo)
c5aa993b 613 int signo;
c906108c
SS
614{
615#ifndef _WIN32
616 kill (PIDGET (inferior_pid), SIGINT);
617#endif
618}
619
c5aa993b 620static void (*osig) ();
c906108c
SS
621
622void
c5aa993b 623set_sigint_trap ()
c906108c
SS
624{
625 if (attach_flag || inferior_thisrun_terminal)
626 {
c5aa993b 627 osig = (void (*)()) signal (SIGINT, pass_signal);
c906108c
SS
628 }
629}
630
631void
c5aa993b 632clear_sigint_trap ()
c906108c
SS
633{
634 if (attach_flag || inferior_thisrun_terminal)
635 {
636 signal (SIGINT, osig);
637 }
638}
639\f
640#if defined (SIGIO) && defined (FASYNC) && defined (FD_SET) && defined (F_SETOWN)
641static void (*old_sigio) ();
642
643static void
644handle_sigio (signo)
645 int signo;
646{
647 int numfds;
648 fd_set readfds;
649
650 signal (SIGIO, handle_sigio);
651
652 FD_ZERO (&readfds);
653 FD_SET (target_activity_fd, &readfds);
654 numfds = select (target_activity_fd + 1, &readfds, NULL, NULL, NULL);
655 if (numfds >= 0 && FD_ISSET (target_activity_fd, &readfds))
656 {
657#ifndef _WIN32
658 if ((*target_activity_function) ())
659 kill (inferior_pid, SIGINT);
660#endif
661 }
662}
663
664static int old_fcntl_flags;
665
666void
667set_sigio_trap ()
668{
669 if (target_activity_function)
670 {
c5aa993b
JM
671 old_sigio = (void (*)()) signal (SIGIO, handle_sigio);
672 fcntl (target_activity_fd, F_SETOWN, getpid ());
c906108c
SS
673 old_fcntl_flags = fcntl (target_activity_fd, F_GETFL, 0);
674 fcntl (target_activity_fd, F_SETFL, old_fcntl_flags | FASYNC);
675 }
676}
677
678void
679clear_sigio_trap ()
680{
681 if (target_activity_function)
682 {
683 signal (SIGIO, old_sigio);
684 fcntl (target_activity_fd, F_SETFL, old_fcntl_flags);
685 }
686}
687#else /* No SIGIO. */
688void
689set_sigio_trap ()
690{
691 if (target_activity_function)
692 abort ();
693}
694
695void
696clear_sigio_trap ()
697{
698 if (target_activity_function)
699 abort ();
700}
701#endif /* No SIGIO. */
702\f
703
704/* This is here because this is where we figure out whether we (probably)
705 have job control. Just using job_control only does part of it because
706 setpgid or setpgrp might not exist on a system without job control.
707 It might be considered misplaced (on the other hand, process groups and
708 job control are closely related to ttys).
709
710 For a more clean implementation, in libiberty, put a setpgid which merely
711 calls setpgrp and a setpgrp which does nothing (any system with job control
712 will have one or the other). */
713int
714gdb_setpgid ()
715{
716 int retval = 0;
717
718 if (job_control)
719 {
720#if defined (NEED_POSIX_SETPGID) || (defined (HAVE_TERMIOS) && defined (HAVE_SETPGID))
721 /* setpgid (0, 0) is supposed to work and mean the same thing as
c5aa993b
JM
722 this, but on Ultrix 4.2A it fails with EPERM (and
723 setpgid (getpid (), getpid ()) succeeds). */
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724 retval = setpgid (getpid (), getpid ());
725#else
726#if defined (TIOCGPGRP)
727#if defined(USG) && !defined(SETPGRP_ARGS)
728 retval = setpgrp ();
729#else
730 retval = setpgrp (getpid (), getpid ());
731#endif /* USG */
732#endif /* TIOCGPGRP. */
733#endif /* NEED_POSIX_SETPGID */
734 }
735 return retval;
736}
737
738void
739_initialize_inflow ()
740{
741 add_info ("terminal", term_info,
c5aa993b 742 "Print inferior's saved terminal status.");
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743
744 add_com ("kill", class_run, kill_command,
745 "Kill execution of program being debugged.");
746
747 inferior_pid = 0;
748
749 terminal_is_ours = 1;
750
751 /* OK, figure out whether we have job control. If neither termios nor
752 sgtty (i.e. termio or go32), leave job_control 0. */
753
754#if defined (HAVE_TERMIOS)
755 /* Do all systems with termios have the POSIX way of identifying job
756 control? I hope so. */
757#ifdef _POSIX_JOB_CONTROL
758 job_control = 1;
759#else
760#ifdef _SC_JOB_CONTROL
761 job_control = sysconf (_SC_JOB_CONTROL);
762#else
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763 job_control = 0; /* have to assume the worst */
764#endif /* _SC_JOB_CONTROL */
765#endif /* _POSIX_JOB_CONTROL */
766#endif /* HAVE_TERMIOS */
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767
768#ifdef HAVE_SGTTY
769#ifdef TIOCGPGRP
770 job_control = 1;
771#else
772 job_control = 0;
773#endif /* TIOCGPGRP */
774#endif /* sgtty */
775}