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SETSID(2P)							    SETSID(2P)

NAME
       setsid - (POSIX only) create session and set process group ID

SYNOPSIS
       #include <sys/types.h>

       pid_t setsid(void);

DESCRIPTION
       The   information   in	this   specification  applies  only  to	 POSIX
       applications.

       If the calling process is  not  a  process  group  leader,  the	setsid
       function	 creates  a  new  session.  The calling process is the session
       leader of the new session, the process group leader of  a  new  process
       group,  and  has	 no controlling terminal.  The process group ID of the
       calling process is set to the process ID of the calling	process.   The
       calling	process	 is  the only process in the new process group and the
       only process in the new session.

RETURN VALUE
       A successful call to setsid returns the value of the process  group  ID
       of  the	calling	 process.   A  value  of  -1  indicates	 that an error
       occurred, and the error code is stored in the global variable errno.

ERRORS
       A possible error for setsid is:

       [EPERM]	      The calling process is already a process	group  leader,
		      or  the  process	group  ID  of a process other than the
		      calling process matches the process ID  of  the  calling
		      process.

SEE ALSO
       execve(2),   exit(2),   fork(2),	  getpid(2),   kill(2),	  setpgid(2P),
       sigaction(2P)

4.2 Berkeley Distribution	August 1, 1992			    SETSID(2P)

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