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GETPGRP(2)                  BSD System Calls Manual                 GETPGRP(2)

NAME
     getpgrp, getpgid -- get process group

SYNOPSIS
     #include <&lt;unistd.h>&gt;

     pid_t
     getpgrp(void);

     pid_t
     getpgid(pid_t pid);

DESCRIPTION
     The process group of the current process is returned by getpgrp().  The
     process group of the pid process is returned by getpgid().  If pid is
     zero, getpgid() returns the process group of 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 to read.

     These calls are thus used by programs such as csh(1) to create process
     groups in implementing job control.  The tcgetpgrp() and tcsetpgrp()
     calls are used to get/set the process group of the control terminal.

ERRORS
     getpgrp() always succeeds, however getpgid() will succeed unless:

     [EPERM]            The current process and the process pid are not in the
                        same session.

     [ESRCH]            There is no process with a process ID equal to pid.

SEE ALSO
     setpgid(2), termios(4)

STANDARDS
     The getpgrp() and getpgid() functions conform to IEEE Std 1003.1-2008
     (``POSIX.1'').

HISTORY
     A getpgrp() function call that took a pid_t pid argument appeared in
     4.0BSD.  This version, without an argument, is derived from its usage in
     System V Release 4, and first appeared in NetBSD 0.9.

     The getpgid() function call is derived from its usage in System V Release
     4, and first appeared in NetBSD 1.2A.

BSD                             March 27, 2017                             BSD