SYNOPSIS
       #include <unistd.h>

       pid_t setpgrp(void);


DESCRIPTION
       If  the calling process is not already a session leader, setpgrp() sets
       the process group ID of the calling process to the process  ID  of  the
       calling  process. If setpgrp() creates a new session, then the new ses-
       sion has no controlling terminal.

       The setpgrp() function has no effect when the calling process is a ses-
       sion leader.

RETURN VALUE
       Upon completion, setpgrp() shall return the process group ID.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       exec() , fork() , getpid() , getsid() , kill() , setpgid() , setsid() ,
       the Base Definitions volume of IEEE Std 1003.1-2001, <unistd.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the  referee document. The original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .