.\" $NetBSD: setpgid.2,v 1.8 1995/02/27 12:36:55 cgd Exp $ .\" .\" 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 .Fo setpgid .Fa "pid_t pid" .Fa "pid_t pgid" .Fc .Ft pid_t .Fo setpgrp .Fa void .Fc .Sh DESCRIPTION .Fn Setpgid sets the process group of the specified process .Ar pid to the specified .Ar pgid . If .Ar pid is zero, then the call applies to the current process. .Pp If the invoker is not the super-user, then the affected process must have the same effective user-id as the invoker or be a descendant of the invoking process. .Pp .Sh RETURN VALUES .Fn Setpgid returns 0 when the operation was successful. If the request failed, -1 is returned and the global variable .Va errno indicates the reason. .Sh ERRORS .Fn Setpgid will fail and the process group will not be altered if: .Bl -tag -width Er .\" =========== .It Bq Er EACCES The value of the .Fa pid argument matches the process ID of a child process of the calling process, and the child process has successfully executed one of the exec functions. .\" =========== .It Bq Er EINVAL The value of the .Fa pgid argument is less than 0 or is not a value supported by the implementation. .\" =========== .It Bq Er EPERM The process indicated by the .Fa pid argument is a session leader. .\" =========== .It Bq Er EPERM The effective user ID of the requested process is different from that of the caller and the process is not a descendant of the calling process. .\" =========== .It Bq Er EPERM The value of the .Fa pgid argument is valid, but does not match the process ID of the process indicated by the .Fa pid argument and there is no process with a process group ID that matches the value of the .Fa pgid argument in the same session as the calling process. .\" =========== .It Bq Er ESRCH The value of the .Fa pid argument does not match the process ID of the calling process or of a child process of the calling process. .El .Sh LEGACY SYNOPSIS .Fd #include <unistd.h> .Pp .Ft int .br .Fo setpgrp .Fa "pid_t pid" .Fa "pid_t pgid" .Fc ; .Pp The legacy .Fn setpgrp function is a clone of the .Fn setpgid function, retained for calling convention compatibility with historical versions of .Bx . .Sh COMPATIBILITY Use of the legacy version of the .Fn setpgrp call will cause compiler diagnostics. Use .Fn setpgid instead. .Pp Use of private (and conflicting) prototypes for .Fn setpgrp will cause compiler diagnostics. Delete the private prototypes and include .In unistd.h . .Sh SEE ALSO .Xr getpgrp 2 , .Xr compat 5 .Sh STANDARDS The .Fn setpgid function conforms to .St -p1003.1-88 .