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OpenDarwin 7.2.1 - man page for setsid (opendarwin section 2)

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SETSID(2)			     BSD System Calls Manual				SETSID(2)

NAME
     setsid -- create session and set process group ID

SYNOPSIS
     #include <sys/types.h>
     #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 ter-
     minal.  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
     setpgid(3), tcgetpgrp(3), tcsetpgrp(3)

STANDARDS
     The setsid function is expected to be compliant with the IEEE Std 1003.1-1988 (``POSIX.1'')
     specification.

BSD					   June 4, 1993 				      BSD
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