x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
SETSID(2) Linux Programmer's Manual SETSID(2)
NAME
setsid - creates a session and sets the process group ID
SYNOPSIS
#include <unistd.h>
pid_t setsid(void);
DESCRIPTION
setsid() creates a new session if the calling process is not a process
group leader. The calling process is the leader of the new session,
the process group leader of the new process group, and has no control-
ling terminal. The process group ID and session ID of the calling
process are set to the PID of the calling process. The calling process
will be the only process in this new process group and in this new ses-
sion.
RETURN VALUE
On success, the (new) session ID of the calling process is returned.
On error, (pid_t) -1 is returned, and errno is set to indicate the
error.
ERRORS
EPERM The process group ID of any process equals the PID of the call-
ing process. Thus, in particular, setsid() fails if the calling
process is already a process group leader.
CONFORMING TO
SVr4, POSIX.1-2001.
NOTES
A child created via fork(2) inherits its parent's session ID. The ses-
sion ID is preserved across an execve(2).
A process group leader is a process with process group ID equal to its
PID. In order to be sure that setsid() will succeed, fork(2) and
_exit(2), and have the child do setsid().
SEE ALSO
setsid(1), getsid(2), setpgid(2), setpgrp(2), tcgetsid(3), creden-
tials(7)
COLOPHON
This page is part of release 3.69 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
http://www.kernel.org/doc/man-pages/.
Linux 2013-02-11 SETSID(2)
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