1.\" $NetBSD: setpgid.2,v 1.16 2002/02/08 01:28:22 ross 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 39.Sh NAME 40.Nm setpgid , 41.Nm setpgrp 42.Nd set process group 43.Sh LIBRARY 44.Lb libc 45.Sh SYNOPSIS 46.Fd #include \*[Lt]unistd.h\*[Gt] 47.Ft int 48.Fn setpgid "pid_t pid" "pid_t pgrp" 49.Ft int 50.Fn setpgrp "pid_t pid" "pid_t pgrp" 51.Sh DESCRIPTION 52.Fn setpgid 53sets the process group of the specified process 54.Ar pid 55to the specified 56.Ar pgrp . 57If 58.Ar pid 59is zero, then the call applies to the current process. 60.Pp 61If the invoker is not the super-user, then the affected process 62must have the same effective user-id as the invoker or be a descendant 63of the invoking process. 64.Sh RETURN VALUES 65.Fn setpgid 66returns 0 when the operation was successful. 67If the request failed, -1 is returned and the global variable 68.Va errno 69indicates the reason. 70.Sh ERRORS 71.Fn setpgid 72will fail and the process group will not be altered if: 73.Bl -tag -width Er 74.It Bq Er EACCES 75The value of the 76.Fa pid 77argument matches the process ID of a child process of the calling process, 78and the child process has successfully executed one of the exec functions. 79.It Bq Er EINVAL 80The value of the 81.Fa pgrp 82argument is less than zero. 83.It Bq Er EPERM 84The effective user ID of the requested process is different 85from that of the caller and the process is not a descendant 86of the calling process. 87.It Bq Er ESRCH 88The value of the 89.Fa pid 90argument does not match the process ID of the calling process or of a 91child process of the calling process. 92.El 93.Sh SEE ALSO 94.Xr getpgrp 2 95.Sh STANDARDS 96The 97.Fn setpgid 98function conforms to 99.St -p1003.1-90 . 100.Sh COMPATIBILITY 101.Fn setpgrp 102is identical to 103.Fn setpgid , 104and is retained for calling convention compatibility with historical 105versions of 106.Bx . 107