NetBSD/lib/libc/gen/initgroups.3

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.\" $NetBSD: initgroups.3,v 1.8 1999/03/22 19:44:43 garbled Exp $
.\"
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.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
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.\" @(#)initgroups.3 8.1 (Berkeley) 6/4/93
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.\"
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.Dd June 4, 1993
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.Dt INITGROUPS 3
.Os
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.Sh NAME
.Nm initgroups
.Nd initialize supplementary group IDs
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.Sh LIBRARY
.Lb libc
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.Sh SYNOPSIS
.Fd #include <unistd.h>
.Ft int
.Fn initgroups "const char *name" "gid_t basegid"
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.Sh DESCRIPTION
The
.Fn initgroups
function
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uses the
.Xr getgrouplist 3
function to calculate the supplementary group IDs for the user
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specified in
.Fa name .
This group list then set up for the current process using
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.Xr setgroups 2 .
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The
.Fa basegid
is automatically included in the group list.
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Typically this value is given as
the group number from the password file.
.Sh RETURN VALUES
The
.Fn initgroups
function
returns \-1 if it was not invoked by the super-user.
.Sh SEE ALSO
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.Xr setgroups 2 ,
.Xr getgrouplist 3
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.Sh HISTORY
The
.Fn initgroups
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function appeared in
.Bx 4.2 .
.Sh BUGS
The
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.Fn getgrouplist
function called by
.Fn initgroups
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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 .