.\" Copyright (c) 1983 Regents of the University of California.
.\" All rights reserved. The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\" @(#)getpgrp.2 6.2 (Berkeley) %G%
getpgrp \- get process group
The process group of the specified process is returned by
is zero, then the call applies to the current process.
Process groups are used for distribution of signals, and
by terminals to arbitrate requests for their input: processes
that have the same process group as the terminal are foreground
and may read, while others will block with a signal if they attempt
This call is thus used by programs such as
in implementing job control.
The TIOCGPGRP and TIOCSPGRP calls
are used to get/set the process group of the control terminal.
setpgrp(2), getuid(2), tty(4)