1 /* Job control and terminal related functions, for GDB and gdbserver
2 when running under Unix.
4 Copyright (C) 1986-2017 Free Software Foundation, Inc.
6 This file is part of GDB.
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
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #include "common-defs.h"
22 #include "job-control.h"
23 #include "gdb_termios.h"
25 /* Nonzero if we have job control. */
28 /* Set the process group ID of the inferior.
30 Just using job_control only does part of it because setpgid or
31 setpgrp might not exist on a system without job control.
33 For a more clean implementation, in libiberty, put a setpgid which merely
34 calls setpgrp and a setpgrp which does nothing (any system with job control
35 will have one or the other). */
44 #if defined (HAVE_TERMIOS) || defined (TIOCGPGRP)
46 /* The call setpgid (0, 0) is supposed to work and mean the same
47 thing as this, but on Ultrix 4.2A it fails with EPERM (and
48 setpgid (getpid (), getpid ()) succeeds). */
49 retval
= setpgid (getpid (), getpid ());
55 retval
= setpgrp (getpid (), getpid ());
57 #endif /* HAVE_SETPGRP */
58 #endif /* HAVE_SETPGID */
59 #endif /* defined (HAVE_TERMIOS) || defined (TIOCGPGRP) */
65 /* See common/common-terminal.h. */
70 /* OK, figure out whether we have job control. If neither termios nor
71 sgtty (i.e. termio or go32), leave job_control 0. */
72 #if defined (HAVE_TERMIOS)
73 /* Do all systems with termios have the POSIX way of identifying job
74 control? I hope so. */
75 #ifdef _POSIX_JOB_CONTROL
78 #ifdef _SC_JOB_CONTROL
79 job_control
= sysconf (_SC_JOB_CONTROL
);
81 job_control
= 0; /* Have to assume the worst. */
82 #endif /* _SC_JOB_CONTROL */
83 #endif /* _POSIX_JOB_CONTROL */
84 #endif /* HAVE_TERMIOS */
91 #endif /* TIOCGPGRP */
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