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60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
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/* Copyright (C) 1991, 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <fcntl.h>
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/* Create a new session with the calling process as its leader.
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The process group IDs of the session and the calling process
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are set to the process ID of the calling process, which is returned. */
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int
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DEFUN_VOID(__setsid)
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{
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pid_t pid = getpid ();
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int tty;
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int save = errno;
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if (__getpgrp (pid) == pid)
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{
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/* Already the leader. */
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errno = EPERM;
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return -1;
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}
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if (setpgid (pid, pid) < 0)
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return -1;
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tty = open ("/dev/tty", 0);
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if (tty < 0)
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{
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errno = save;
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return 0;
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}
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(void) __ioctl (tty, TIOCNOTTY, 0);
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(void) __close (tty);
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errno = save;
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return 0;
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}
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weak_alias (__setsid, setsid)
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