1.\" $NetBSD: setpgid.2,v 1.9 1997/03/27 06:14:04 mikel Exp $ 2.\" 3.\" Copyright (c) 1980, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)setpgid.2 8.1 (Berkeley) 6/4/93 35.\" 36.Dd June 4, 1993 37.Dt SETPGID 2 38.Os BSD 4 39.Sh NAME 40.Nm setpgid , 41.Nm setpgrp 42.Nd set process group 43.Sh SYNOPSIS 44.Fd #include <unistd.h> 45.Ft int 46.Fn setpgid "pid_t pid" "pid_t pgrp" 47.Ft int 48.Fn setpgrp "pid_t pid" "pid_t pgrp" 49.Sh DESCRIPTION 50.Fn Setpgid 51sets the process group of the specified process 52.Ar pid 53to the specified 54.Ar pgrp . 55If 56.Ar pid 57is zero, then the call applies to the current process. 58.Pp 59If the invoker is not the super-user, then the affected process 60must have the same effective user-id as the invoker or be a descendant 61of the invoking process. 62.Sh RETURN VALUES 63.Fn Setpgid 64returns 0 when the operation was successful. 65If the request failed, -1 is returned and the global variable 66.Va errno 67indicates the reason. 68.Sh ERRORS 69.Fn Setpgid 70will fail and the process group will not be altered if: 71.Bl -tag -width Er 72.It Bq Er EACCESS 73The value of the 74.Fa pid 75argument matches the process ID of a child process of the calling process, 76and the child process has successfully executed one of the exec functions. 77.It Bq Er EINVAL 78The value of the 79.Fa pgrp 80argument is less than zero. 81.It Bq Er EPERM 82The effective user ID of the requested process is different 83from that of the caller and the process is not a descendant 84of the calling process. 85.It Bq Er ESRCH 86The value of the 87.Fa pid 88argument does not match the process ID of the calling process or of a 89child process of the calling process. 90.El 91.Sh SEE ALSO 92.Xr getpgrp 2 93.Sh STANDARDS 94The 95.Fn setpgid 96function conforms to 97.St -p1003.1-88 . 98.Sh COMPATIBILITY 99.Fn Setpgrp 100is identical to 101.Fn setpgid , 102and is retained for calling convention compatibility with historical 103versions of 104.Bx . 105