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-.\" 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:
-.\" 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. 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.
-.\"
-.\" @(#)setgroups.2 8.2 (Berkeley) 4/16/94
-.\"
-.Dd January 19, 2018
-.Dt SETGROUPS 2
-.Os
-.Sh NAME
-.Nm setgroups
-.Nd set group access list
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In sys/param.h
-.In unistd.h
-.Ft int
-.Fn setgroups "int ngroups" "const gid_t *gidset"
-.Sh DESCRIPTION
-The
-.Fn setgroups
-system call
-sets the group access list of the current user process
-according to the array
-.Fa gidset .
-The
-.Fa ngroups
-argument
-indicates the number of entries in the array and must be no
-more than
-.Dv {NGROUPS_MAX}+1 .
-.Pp
-Only the super-user may set a new group list.
-.Pp
-The first entry of the group array
-.Pq Va gidset[0]
-is used as the effective group-ID for the process.
-This entry is over-written when a setgid program is run.
-To avoid losing access to the privileges of the
-.Va gidset[0]
-entry, it should be duplicated later in the group array.
-By convention,
-this happens because the group value indicated
-in the password file also appears in
-.Pa /etc/group .
-The group value in the password file is placed in
-.Va gidset[0]
-and that value then gets added a second time when the
-.Pa /etc/group
-file is scanned to create the group set.
-.Sh RETURN VALUES
-.Rv -std setgroups
-.Sh ERRORS
-The
-.Fn setgroups
-system call will fail if:
-.Bl -tag -width Er
-.It Bq Er EPERM
-The caller is not the super-user.
-.It Bq Er EINVAL
-The number specified in the
-.Fa ngroups
-argument is larger than the
-.Dv {NGROUPS_MAX}+1
-limit.
-.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
-system call appeared in
-.Bx 4.2 .