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.\" @(#)getpgrp.2 6.4 (Berkeley) 3/10/91 33.\" 34.Dd March 10, 1991 35.Dt GETPGRP 2 36.Os BSD 4.2 37.Sh NAME 38.Nm getpgrp 39.Nd get process group 40.Sh SYNOPSIS 41.Fd #include <unistd.h> 42.Ft pid_t 43.Fn getpgrp "void" 44.Sh DESCRIPTION 45The process group of the current process is returned by 46.Fn getpgrp . 47.Pp 48Process groups are used for distribution of signals, and 49by terminals to arbitrate requests for their input: processes 50that have the same process group as the terminal are foreground 51and may read, while others will block with a signal if they attempt 52to read. 53.Pp 54This call is thus used by programs such as 55.Xr csh 1 56to create 57process groups 58in implementing job control. 59The 60.Dv TIOCGPGRP 61and 62.Dv TIOCSPGRP 63calls 64described in 65.Xr termios 4 66are used to get/set the process group of the control terminal. 67.Sh SEE ALSO 68.Xr setpgrp 2 , 69.Xr getuid 2 , 70.Xr termios 4 71.Sh HISTORY 72The 73.Nm 74function call appeared in 75.Bx 4.0 . 76.Sh STANDARDS 77The 78.Fn getpgrp 79function conforms to IEEE Std 1003.1-1988 80.Pq Dq Tn POSIX . 81.Sh COMPATABILITY 82This version of 83.Fn getpgrp 84differs from past Berkeley versions by not taking a 85.Fa "pid_t pid" 86argument. 87This incompatibility is required by 88.St -p1003.1-88 . 89