| NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON | The Linux Programming Interface |
SETSID(2) Linux Programmer's Manual SETSID(2)
setsid - creates a session and sets the process group ID
#include <unistd.h>
pid_t setsid(void);
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 controlling 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 session.
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.
EPERM The process group ID of any process equals the PID of the
calling process. Thus, in particular, setsid() fails if the
calling process is already a process group leader.
SVr4, POSIX.1-2001.
A child created via fork(2) inherits its parent's session ID. The
session 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().
setsid(1), getsid(2), setpgid(2), setpgrp(2), tcgetsid(3),
credentials(7)
This page is part of release 3.51 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2013-02-11 SETSID(2)
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