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. 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.\" @(#)setpgid.2 8.1 (Berkeley) 6/4/93 33.\" $FreeBSD: src/lib/libc/sys/setpgid.2,v 1.5.2.7 2001/12/14 18:34:01 ru Exp $ 34.\" $DragonFly: src/lib/libc/sys/setpgid.2,v 1.4 2007/09/05 08:23:43 hasso Exp $ 35.\" 36.Dd June 4, 1993 37.Dt SETPGID 2 38.Os 39.Sh NAME 40.Nm setpgid , 41.Nm setpgrp 42.Nd set process group 43.Sh LIBRARY 44.Lb libc 45.Sh SYNOPSIS 46.In unistd.h 47.Ft int 48.Fn setpgid "pid_t pid" "pid_t pgrp" 49.Ft int 50.Fn setpgrp "pid_t pid" "pid_t pgrp" 51.Sh DESCRIPTION 52.Fn Setpgid 53sets the process group of the specified process 54.Fa pid 55to the specified 56.Fa pgrp . 57If 58.Fa pid 59is zero, then the call applies to the current process. 60If 61.Ar pgrp 62is zero, then the process id of the process specified by 63.Ar pid 64is used instead. 65.Pp 66If the invoker is not the super-user, then the affected process 67must have the same effective user-id as the invoker or be a descendant 68of the invoking process. 69.Sh RETURN VALUES 70.Rv -std setpgid 71.Sh COMPATIBILITY 72.Fn Setpgrp 73is identical to 74.Fn setpgid , 75and is retained for calling convention compatibility with historical 76versions of 77.Bx . 78.Sh ERRORS 79.Fn Setpgid 80will fail and the process group will not be altered if: 81.Bl -tag -width Er 82.It Bq Er EACCES 83The value of the 84.Fa pid 85argument matches the process ID of a child process of the calling 86process, and the child process has successfully executed one of the 87.Xr exec 3 88functions. 89.It Bq Er EINVAL 90The value of the 91.Fa pgrp 92is not legal (less than zero). 93.It Bq Er EPERM 94The effective user ID of the requested process is different 95from that of the caller and the process is not a descendant 96of the calling process. 97.It Bq Er ESRCH 98The value of the 99.Fa pid 100argument does not match the process ID of the calling process 101or of a child process of the calling process. 102.El 103.Sh SEE ALSO 104.Xr getpgrp 2 105.Sh STANDARDS 106The 107.Fn setpgid 108function call is expected to conform to 109.St -p1003.1-90 . 110