87 lines
2.4 KiB
C++
87 lines
2.4 KiB
C++
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/* Job control and terminal related functions, for GDB and gdbserver
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when running under Unix.
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Copyright (C) 1986-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "common-defs.h"
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#include "job-control.h"
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#ifdef HAVE_TERMIOS_H
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#include <termios.h>
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#endif
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#include <unistd.h>
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/* Nonzero if we have job control. */
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int job_control;
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/* Set the process group ID of the inferior.
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Just using job_control only does part of it because setpgid or
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setpgrp might not exist on a system without job control.
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For a more clean implementation, in libiberty, put a setpgid which merely
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calls setpgrp and a setpgrp which does nothing (any system with job control
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will have one or the other). */
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int
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gdb_setpgid ()
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{
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int retval = 0;
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if (job_control)
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{
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#ifdef HAVE_SETPGID
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/* The call setpgid (0, 0) is supposed to work and mean the same
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thing as this, but on Ultrix 4.2A it fails with EPERM (and
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setpgid (getpid (), getpid ()) succeeds). */
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retval = setpgid (getpid (), getpid ());
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#else
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#ifdef HAVE_SETPGRP
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#ifdef SETPGRP_VOID
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retval = setpgrp ();
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#else
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retval = setpgrp (getpid (), getpid ());
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#endif
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#endif /* HAVE_SETPGRP */
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#endif /* HAVE_SETPGID */
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}
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return retval;
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}
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/* See gdbsupport/common-terminal.h. */
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void
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have_job_control ()
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{
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/* OK, figure out whether we have job control. If termios is not
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available, leave job_control 0. */
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#if defined (HAVE_TERMIOS_H)
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/* Do all systems with termios have the POSIX way of identifying job
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control? I hope so. */
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#ifdef _POSIX_JOB_CONTROL
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job_control = 1;
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#else
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#ifdef _SC_JOB_CONTROL
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job_control = sysconf (_SC_JOB_CONTROL);
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#else
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job_control = 0; /* Have to assume the worst. */
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#endif /* _SC_JOB_CONTROL */
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#endif /* _POSIX_JOB_CONTROL */
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#endif /* HAVE_TERMIOS_H */
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}
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