.\" Copyright (c) 1980, 1991, 1993.\"	The Regents of the University of California.  All rights reserved..\".\" Redistribution and use in source and binary forms, with or without.\" modification, are permitted provided that the following conditions.\" are met:.\" 1. Redistributions of source code must retain the above copyright.\"    notice, this list of conditions and the following disclaimer..\" 2. Redistributions in binary form must reproduce the above copyright.\"    notice, this list of conditions and the following disclaimer in the.\"    documentation and/or other materials provided with the distribution..\" 3. All advertising materials mentioning features or use of this software.\"    must display the following acknowledgement:.\"	This product includes software developed by the University of.\"	California, Berkeley and its contributors..\" 4. Neither the name of the University nor the names of its contributors.\"    may be used to endorse or promote products derived from this software.\"    without specific prior written permission..\".\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION).\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF.\" SUCH DAMAGE..\".\"     @(#)setpgid.2	8.1 (Berkeley) 6/4/93.\".Dd June 4, 1993.Dt SETPGID 2.Os BSD 4.Sh NAME.Nm setpgid ,.Nm setpgrp.Nd set process group.Sh SYNOPSIS.Fd #include <unistd.h>.Ft int.Fn setpgid pid_tpid pid_tpgrp.Ft int.Fn setpgrp pid_tpid pid_tpgrp.Sh DESCRIPTION.Fn Setpgidsets the process group of the specified process.Ar pidto the specified.Ar pgrp .If.Ar pidis zero, then the call applies to the current process..PpIf the invoker is not the super-user, then the affected processmust have the same effective user-id as the invoker or be a descendantof the invoking process..Sh RETURN VALUES.Fn Setpgidreturns 0 when the operation was successful.If the request failed, -1 is returned and the global variable.Va errnoindicates the reason..Sh ERRORS.Fn Setpgidwill fail and the process group will not be altered if:.Bl -tag -width indent.It Bq Er ESRCHThe requested process does not exist..It Bq Er EPERMThe effective user ID of the requested process is differentfrom that of the caller and the process is not a descendentof the calling process..El.Sh SEE ALSO.Xr getpgrp 2.Sh STANDARDS.Fn Setpgidconforms to IEEE Std 1003.1-1988.Pq Dq Tn POSIX ..Sh COMPATIBILITY.Fn Setpgrpis identical to.Fn setpgid ,and is retained for calling convention compatibility with historicalversions of.Bx .