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.\" $FreeBSD$ 34.\" 35.Dd June 4, 1993 36.Dt SETPGID 2 37.Os 38.Sh NAME 39.Nm setpgid , 40.Nm setpgrp 41.Nd set process group 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.Fd #include <unistd.h> 46.Ft int 47.Fn setpgid "pid_t pid" "pid_t pgrp" 48.Ft int 49.Fn setpgrp "pid_t pid" "pid_t pgrp" 50.Sh DESCRIPTION 51.Fn Setpgid 52sets the process group of the specified process 53.Fa pid 54to the specified 55.Fa pgrp . 56If 57.Fa pid 58is zero, then the call applies to the current process. 59.Pp 60If the invoker is not the super-user, then the affected process 61must have the same effective user-id as the invoker or be a descendant 62of the invoking process. 63.Sh RETURN VALUES 64.Fn Setpgid 65returns 0 when the operation was successful. 66If the request failed, -1 is returned and the global variable 67.Va errno 68indicates the reason. 69.Sh ERRORS 70.Fn Setpgid 71will fail and the process group will not be altered if: 72.Bl -tag -width Er 73.It Bq Er ESRCH 74The requested process does not exist. 75.It Bq Er EPERM 76The effective user ID of the requested process is different 77from that of the caller and the process is not a descendent 78of the calling process. 79.El 80.Sh SEE ALSO 81.Xr getpgrp 2 82.Sh STANDARDS 83The 84.Fn setpgid 85function call is expected to conform to 86.St -p1003.1-90 . 87.Sh COMPATIBILITY 88.Fn Setpgrp 89is identical to 90.Fn setpgid , 91and is retained for calling convention compatibility with historical 92versions of 93.Bx . 94