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GETPGRP(2)		  FreeBSD System Calls Manual		    GETPGRP(2)

NAME
     getpgrp, getpgid -- get process group

SYNOPSIS
     #include <unistd.h>

     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.

FreeBSD	13.0		      September	10, 2015		  FreeBSD 13.0

NAME | SYNOPSIS | DESCRIPTION | ERRORS | SEE ALSO | STANDARDS | HISTORY

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