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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 control-
       ling 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.

RETURN VALUE
       The session ID of the calling process.

ERRORS
       On error, -1 will be returned.  The only	 error	which  can  happen  is
       EPERM.  It  is returned when 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.

NOTES
       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 and  exit,  and
       have the	child do setsid().

CONFORMING TO
       POSIX, SVr4.

SEE ALSO
       setpgid(2), setpgrp(2)

Linux 1.0.0			  1994-08-27			     SETSID(2)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | NOTES | CONFORMING TO | SEE ALSO

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