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SETSID(2)		       System Calls Manual		       SETSID(2)

NAME
     setsid -- create session and set process group ID

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     pid_t
     setsid(void);

DESCRIPTION
     The setsid() system call creates a new session.  The calling process is the
     session  leader  of  the  new session, is the process group leader of a new
     process group and has no controlling terminal.  The calling process is  the
     only process in either the session or the process group.

RETURN VALUES
     Upon  successful  completion, the setsid() system call returns the value of
     the process group ID of the new process group, which is  the  same  as  the
     process ID of the calling process.  If an error occurs, setsid() returns -1
     and the global variable errno is set to indicate the error.

ERRORS
     The setsid() system call will fail if:

     [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
     setpgid(2), tcgetpgrp(3), tcsetpgrp(3)

STANDARDS
     The setsid() system call is expected  to  be  compliant  with  the  ISO/IEC
     9945-1:1990 ("POSIX.1") specification.

FreeBSD ports 15.quarterly	  June 4, 1993			       SETSID(2)

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