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.\" @(#)setpgid.2 6.3 (Berkeley) 3/10/91 33.\" 34.Dd March 10, 1991 35.Dt SETPGRP 2 36.Os BSD 4 37.Sh NAME 38.Nm setpgid , 39.Nm setpgrp 40.Nd set process group 41.Sh SYNOPSIS 42.Fd #include <unistd.h> 43.Ft int 44.Fn setpgid pid_tpid pid_tpgrp 45.Ft int 46.Fn setpgrp pid_tpid pid_tpgrp 47.Sh DESCRIPTION 48.Fn Setpgid 49sets the process group of the specified process 50.Ar pid 51to the specified 52.Ar pgrp . 53If 54.Ar pid 55is zero, then the call applies to the current process. 56.Pp 57If the invoker is not the super-user, then the affected process 58must have the same effective user-id as the invoker or be a descendant 59of the invoking process. 60.Sh RETURN VALUES 61.Fn Setpgid 62returns 0 when the operation was successful. 63If the request failed, -1 is returned and the global variable 64.Va errno 65indicates the reason. 66.Sh ERRORS 67.Fn Setpgid 68will fail and the process group will not be altered if: 69.Bl -tag -width indent 70.It Bq Er ESRCH 71The requested process does not exist. 72.It Bq Er EPERM 73The effective user ID of the requested process is different 74from that of the caller and the process is not a descendent 75of the calling process. 76.El 77.Sh SEE ALSO 78.Xr getpgrp 2 79.Sh STANDARDS 80.Fn Setpgid 81conforms to IEEE Std 1003.1-1988 82.Pq Dq Tn POSIX . 83.Sh COMPATIBILITY 84.Fn Setpgrp 85is identical to 86.Fn setpgid , 87and is retained for calling convention compatibility with historical 88versions of 89.Bx . 90