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NetBSD 6.1.5 - man page for setsid (netbsd section 2)

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SETSID(2)			     BSD 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() function 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.

     Upon successful completion, the setsid() function 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.

ERRORS
     If an error occurs, setsid() returns -1 and the global variable errno is set to indicate the
     error, as follows:

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

STANDARDS
     The setsid() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').

BSD					  April 4, 2011 				      BSD
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