1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)setpgid.2 8.1 (Berkeley) 6/4/93 29.\" $FreeBSD: src/lib/libc/sys/setpgid.2,v 1.5.2.7 2001/12/14 18:34:01 ru Exp $ 30.\" $DragonFly: src/lib/libc/sys/setpgid.2,v 1.4 2007/09/05 08:23:43 hasso Exp $ 31.\" 32.Dd June 4, 1993 33.Dt SETPGID 2 34.Os 35.Sh NAME 36.Nm setpgid , 37.Nm setpgrp 38.Nd set process group 39.Sh LIBRARY 40.Lb libc 41.Sh SYNOPSIS 42.In unistd.h 43.Ft int 44.Fn setpgid "pid_t pid" "pid_t pgrp" 45.Ft int 46.Fn setpgrp "pid_t pid" "pid_t pgrp" 47.Sh DESCRIPTION 48.Fn Setpgid 49sets the process group of the specified process 50.Fa pid 51to the specified 52.Fa pgrp . 53If 54.Fa pid 55is zero, then the call applies to the current process. 56If 57.Ar pgrp 58is zero, then the process id of the process specified by 59.Ar pid 60is used instead. 61.Pp 62If the invoker is not the super-user, then the affected process 63must have the same effective user-id as the invoker or be a descendant 64of the invoking process. 65.Sh RETURN VALUES 66.Rv -std setpgid 67.Sh COMPATIBILITY 68.Fn Setpgrp 69is identical to 70.Fn setpgid , 71and is retained for calling convention compatibility with historical 72versions of 73.Bx . 74.Sh ERRORS 75.Fn Setpgid 76will fail and the process group will not be altered if: 77.Bl -tag -width Er 78.It Bq Er EACCES 79The value of the 80.Fa pid 81argument matches the process ID of a child process of the calling 82process, and the child process has successfully executed one of the 83.Xr exec 3 84functions. 85.It Bq Er EINVAL 86The value of the 87.Fa pgrp 88is not legal (less than zero). 89.It Bq Er EPERM 90The effective user ID of the requested process is different 91from that of the caller and the process is not a descendant 92of the calling process. 93.It Bq Er ESRCH 94The value of the 95.Fa pid 96argument does not match the process ID of the calling process 97or of a child process of the calling process. 98.El 99.Sh SEE ALSO 100.Xr getpgrp 2 101.Sh STANDARDS 102The 103.Fn setpgid 104function call is expected to conform to 105.St -p1003.1-90 . 106