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 1.7 1994/05/02 23:54:59 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_t pid" "pid_t pgrp" 46.Ft int 47.Fn setpgrp "pid_t pid" "pid_t pgrp" 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 Er 71.It Bq Er EACCESS 72The value of the 73.Fa pid 74argument matches the process ID of a child process of the calling process, 75and the child process has successfully executed one of the exec functions. 76.It Bq Er EPERM 77The effective user ID of the requested process is different 78from that of the caller and the process is not a descendant 79of the calling process. 80.It Bq Er ESRCH 81The value of the 82.Fa pid 83argument does not match the process ID of the calling process or of a 84child process of the calling process. 85.El 86.Sh SEE ALSO 87.Xr getpgrp 2 88.Sh STANDARDS 89The 90.Fn setpgid 91function conforms to 92.St -p1003.1-88 . 93.Sh COMPATIBILITY 94.Fn Setpgrp 95is identical to 96.Fn setpgid , 97and is retained for calling convention compatibility with historical 98versions of 99.Bx . 100