NetBSD/lib/libc/sys/getgroups.2

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.\" $NetBSD: getgroups.2,v 1.11 1998/08/29 08:32:37 lukem Exp $
.\"
.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
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.\" @(#)getgroups.2 8.2 (Berkeley) 4/16/94
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.\"
.Dd April 16, 1994
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.Dt GETGROUPS 2
.Os BSD 4.2
.Sh NAME
.Nm getgroups
.Nd get group access list
.Sh SYNOPSIS
.Fd #include <sys/types.h>
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.Fd #include <unistd.h>
.Ft int
.Fn getgroups "int gidsetlen" "gid_t *gidset"
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.Sh DESCRIPTION
.Fn getgroups
gets the current group access list of the current user process
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and stores it in the array
.Fa gidset .
The parameter
.Fa gidsetlen
indicates the number of entries that may be placed in
.Fa gidset .
.Fn getgroups
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returns the actual number of groups returned in
.Fa gidset .
No more than
.Dv {NGROUPS_MAX}
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will ever
be returned.
If
.Fa gidsetlen
is 0,
.Fn getgroups
returns the number of groups without modifying the
.Fa gidset
array.
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.Sh RETURN VALUES
A successful call returns the number of groups in the group set.
A value of -1 indicates that an error occurred, and the error
code is stored in the global variable
.Va errno .
.Sh ERRORS
The possible errors for
.Fn getgroups
are:
.Bl -tag -width Er
.It Bq Er EINVAL
The argument
.Fa gidsetlen
is non-zero and is smaller than the number of groups in the group set.
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.It Bq Er EFAULT
The argument
.Fa gidset
specifies
an invalid address.
.El
.Sh SEE ALSO
.Xr setgroups 2 ,
.Xr initgroups 3
.Sh STANDARDS
The
.Fn getgroups
function conforms to
.St -p1003.1-90 .
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.Sh HISTORY
The
.Fn getgroups
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function call appeared in
.Bx 4.2 .