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RedHat 9 (Linux i386) - man page for setsid (redhat section 2)

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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.

       The session ID of the calling process.

       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.

       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().

       POSIX, SVr4.

       setpgid(2), setpgrp(2)

Linux 1.0.0				    1994-08-27					SETSID(2)
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