Libc-498.tar.gz

[apple/libc.git] / gen / initgroups.3

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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
-.\" 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
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-.\" 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
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-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)initgroups.3       8.1 (Berkeley) 6/4/93
-.\" $FreeBSD: src/lib/libc/gen/initgroups.3,v 1.10 2001/10/01 16:08:51 ru Exp $
-.\"
-.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" "int 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
-The
-.Fn initgroups
-function
-returns \-1 if it was not invoked by the super-user.
-.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 .