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setpgrp(3posix)


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.12008, <unistd.h>

COPYRIGHT

   Portions  of  this text are reprinted and reproduced in electronic form
   from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
   --  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  Standard
   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 .



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