CentOS 7.0 - man page for setsid (centos section 2)

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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 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.

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 calling  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 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().

SEE ALSO
       setsid(1), getsid(2), setpgid(2), setpgrp(2), tcgetsid(3), credentials(7)

COLOPHON
       This page is part of release 3.53 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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