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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 tty. 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().
getsid(2), setpgid(2), setpgrp(2), tcgetsid(3), credentials(7)
This page is part of release 3.32 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 2008-12-03 SETSID(2)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface