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.\" Copyright (c) 1983, 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
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.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
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.\"    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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.\" SUCH DAMAGE.
.\"
.\"     @(#)initgroups.3	8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
.Dd June 4, 1993
.Dt INITGROUPS 3
.Os
.Sh NAME
.Nm initgroups
.Nd initialize group access list
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In unistd.h
.Ft int
.Fn initgroups "const char *name" "gid_t basegid"
.Sh DESCRIPTION
The
.Fn initgroups
function
uses the
.Xr getgrouplist 3
function to calculate the group access list for the user
specified in
.Fa name .
This group list is then setup for the current process using
.Xr setgroups 2 .
The
.Fa basegid
is automatically included in the groups list.
Typically this value is given as
the group number from the password file.
.Sh RETURN VALUES
.Rv -std initgroups
.Sh ERRORS
The
.Fn initgroups
function may fail and set
.Va errno
for any of the errors specified for the library function
.Xr setgroups 2 .
.Sh SEE ALSO
.Xr setgroups 2 ,
.Xr getgrouplist 3
.Sh HISTORY
The
.Fn initgroups
function appeared in
.Bx 4.2 .
.Sh BUGS
The
.Fn getgrouplist
function called by
.Fn initgroups
uses the routines based on
.Xr getgrent 3 .
If the invoking program uses any of these routines,
the group structure will
be overwritten in the call to
.Fn initgroups .