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58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/* Copyright (C) 1991, 1995, 1996, 1997 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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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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__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 (__getpgid (pid) == pid)
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{
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/* Already the leader. */
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__set_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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__set_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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__set_errno (save);
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return 0;
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}
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weak_alias (__setsid, setsid)
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