PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of
       this interface may differ (consult the corresponding 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.1‐2017, <unistd.h>

COPYRIGHT

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1-2017, Standard for Information Technology -- Portable  Operating  System  Interface
       (POSIX),  The  Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       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 .