1.\" Copyright (c) 1983, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)getpgrp.2 6.4 (Berkeley) 3/10/91 33.\" $Id: getpgrp.2,v 1.7 1994/01/31 18:36:17 jtc Exp $ 34.\" 35.Dd March 10, 1991 36.Dt GETPGRP 2 37.Os BSD 4.2 38.Sh NAME 39.Nm getpgrp 40.Nd get process group 41.Sh SYNOPSIS 42.Fd #include <sys/types.h> 43.Fd #include <unistd.h> 44.Ft pid_t 45.Fn getpgrp "void" 46.Sh DESCRIPTION 47The process group of the current process is returned by 48.Fn getpgrp . 49.Pp 50Process groups are used for distribution of signals, and 51by terminals to arbitrate requests for their input: processes 52that have the same process group as the terminal are foreground 53and may read, while others will block with a signal if they attempt 54to read. 55.Pp 56This call is thus used by programs such as 57.Xr csh 1 58to create 59process groups 60in implementing job control. 61The 62.Dv TIOCGPGRP 63and 64.Dv TIOCSPGRP 65calls 66described in 67.Xr termios 4 68are used to get/set the process group of the control terminal. 69.Sh SEE ALSO 70.Xr setpgrp 2 , 71.Xr getuid 2 , 72.Xr termios 4 73.Sh HISTORY 74The 75.Fn getpgrp 76function call appeared in 77.Bx 4.0 . 78.Sh STANDARDS 79The 80.Fn getpgrp 81function conforms to 82.St -p1003.1-88 . 83.Sh COMPATIBILITY 84This version of 85.Fn getpgrp 86differs from past Berkeley versions by not taking a 87.Fa "pid_t pid" 88argument. 89This incompatibility is required by 90.St -p1003.1-88 . 91