View Source: getpgrp(2) - Waikato Linux Users Group

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!!NAME
setpgrp - get process group
!!SYNOPSIS
 __#include <unistd.h>__
 __pid_t getpgrp(void);__
!!DESCRIPTION

getpgrp(2) is equivalent to [getpgid(0)|getpgrp(2)]. Each process group is a member of a session and each process is a member of the session of which its process group is a member.

[ProcessGroup]s 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 to read. These calls are thus used by programs such as csh(1) to create process groups in implementing job control. The [TIOCGPGRP] and
[TIOCSPGRP] calls described in termios(4) are used to get/set the process group of the control terminal.

If a session has a controlling terminal, [CLOCAL] is not set and a hangup occurs, then the session leader is sent a [SIGHUP]. If the session leader exits, the [SIGHUP] signal will be sent to each process in the foreground process group of the controlling terminal.

If the exit of the process causes a process group to become orphaned, and if any member of the newly-orphaned process group is stopped, then a [SIGHUP] signal followed by a [SIGCONT] signal will be sent to each process in the newly-orphaned process group.

!!RETURN VALUE
getpgrp(2) always returns the current process group.

!!CONFORMING TO
The function getpgrp(2) conforms to POSIX.1.

!!SEE ALSO
getuid(2), setsid(2), tcsetpgrp(3), termios(4)

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Last edited on Tuesday, December 31, 2002 1:31:23 am by PerryLorier

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