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.\"	$NetBSD: setgroups.2,v 1.7 1995/02/27 12:36:49 cgd Exp $
.\"
.\" Copyright (c) 1983, 1991, 1993, 1994
.\"	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:
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.\"    notice, this list of conditions and the following disclaimer.
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.\"    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
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" SUCH DAMAGE.
.\"
.\"     @(#)setgroups.2	8.2 (Berkeley) 4/16/94
.\"
.Dd April 16, 1994
.Dt SETGROUPS 2
.Os BSD 4.2
.Sh NAME
.Nm setgroups
.Nd set group access list
.Sh SYNOPSIS
.Fd #include <sys/types.h>
.Fd #include <unistd.h>
.Ft int
.Fn setgroups "int ngroups" "const gid_t *gidset"
.Sh DESCRIPTION
.Fn Setgroups
sets the group access list of the current user process
according to the array 
.Fa gidset .
The parameter
.Fa ngroups
indicates the number of entries in the array and must be no
more than
.Dv {NGROUPS_MAX} .
.Pp
Only the super-user may set new groups.
.Sh RETURN VALUES
A 0 value is returned on success, -1 on error, with
an error code stored in
.Va errno .
.Sh ERRORS
The
.Fn setgroups
call will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The value of 
.Fa ngroups
is greater than
.Dv {NGROUPS_MAX} .
.It Bq Er EPERM
The caller is not the super-user.
.It Bq Er EFAULT
The address specified for
.Fa gidset
is outside the process
address space.
.El
.Sh SEE ALSO
.Xr getgroups 2 ,
.Xr initgroups 3
.Sh HISTORY
The
.Fn setgroups
function call appeared in
.Bx 4.2 .