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SETSID(2)		  FreeBSD 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	13.0			 June 4, 1993			  FreeBSD 13.0
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | STANDARDS

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