1.\" Copyright (c) 1980, 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: @(#)setpgid.2 6.3 (Berkeley) 3/10/91 33.\" $Id: setpgid.2,v 1.3 1993/11/25 00:39:37 jtc Exp $ 34.\" 35.Dd March 10, 1991 36.Dt SETPGRP 2 37.Os BSD 4 38.Sh NAME 39.Nm setpgid , 40.Nm setpgrp 41.Nd set process group 42.Sh SYNOPSIS 43.Fd #include <unistd.h> 44.Ft int 45.Fn setpgid pid_tpid pid_tpgrp 46.Ft int 47.Fn setpgrp pid_tpid pid_tpgrp 48.Sh DESCRIPTION 49.Fn Setpgid 50sets the process group of the specified process 51.Ar pid 52to the specified 53.Ar pgrp . 54If 55.Ar pid 56is zero, then the call applies to the current process. 57.Pp 58If the invoker is not the super-user, then the affected process 59must have the same effective user-id as the invoker or be a descendant 60of the invoking process. 61.Sh RETURN VALUES 62.Fn Setpgid 63returns 0 when the operation was successful. 64If the request failed, -1 is returned and the global variable 65.Va errno 66indicates the reason. 67.Sh ERRORS 68.Fn Setpgid 69will fail and the process group will not be altered if: 70.Bl -tag -width indent 71.It Bq Er ESRCH 72The requested process does not exist. 73.It Bq Er EPERM 74The effective user ID of the requested process is different 75from that of the caller and the process is not a descendent 76of the calling process. 77.El 78.Sh SEE ALSO 79.Xr getpgrp 2 80.Sh STANDARDS 81The 82.Fn setpgid 83function conforms to 84.St -p1003.1-88 . 85.Sh COMPATIBILITY 86.Fn Setpgrp 87is identical to 88.Fn setpgid , 89and is retained for calling convention compatibility with historical 90versions of 91.Bx . 92