posix man page for setpgrp

SETPGRP(3P)						     POSIX Programmer's Manual						       SETPGRP(3P)

PROLOG
       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME
       setpgrp -- set the process group ID

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 session has no controlling terminal.

       The setpgrp() function has no effect when the calling process is a session 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
       It  is  unspecified  whether  this  function behaves as setpgid(0,0) or setsid() unless the process is already a session leader. Therefore,
       applications are encouraged to use setpgid() or setsid() as appropriate.

RATIONALE
       None.

FUTURE DIRECTIONS
       The setpgrp() function may be removed in a future version.

SEE ALSO
       exec, fork(), getpid(), getsid(), kill(), setpgid(), setsid()

       The Base Definitions volume of POSIX.1-2008, <unistd.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy  --	Portable  Operating  System  Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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 Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE
/The Open Group						       2013							       SETPGRP(3P)