104 lines
3.2 KiB
Groff
104 lines
3.2 KiB
Groff
.\" 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
|
|
.\" 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.
|
|
.\"
|
|
.\" @(#)getgroups.2 8.2 (Berkeley) 4/16/94
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd March 5, 1999
|
|
.Dt GETGROUPS 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm getgroups
|
|
.Nd get group access list
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In sys/types.h
|
|
.In unistd.h
|
|
.Ft int
|
|
.Fn getgroups "int gidsetlen" "gid_t *gidset"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn getgroups
|
|
system call
|
|
gets the current group access list of the user process
|
|
and stores it in the array
|
|
.Fa gidset .
|
|
The
|
|
.Fa gidsetlen
|
|
argument
|
|
indicates the number of entries that may be placed in
|
|
.Fa gidset .
|
|
The
|
|
.Fn getgroups
|
|
system call
|
|
returns the actual number of groups returned in
|
|
.Fa gidset .
|
|
No more than
|
|
.Dv NGROUPS_MAX
|
|
will ever
|
|
be returned.
|
|
If
|
|
.Fa gidsetlen
|
|
is zero,
|
|
.Fn getgroups
|
|
returns the number of supplementary group IDs associated with
|
|
the calling process without modifying the array pointed to by
|
|
.Fa gidset .
|
|
.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 smaller than the number of groups in the group set.
|
|
.It Bq Er EFAULT
|
|
The argument
|
|
.Fa gidset
|
|
specifies
|
|
an invalid address.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr setgroups 2 ,
|
|
.Xr initgroups 3
|
|
.Sh HISTORY
|
|
The
|
|
.Fn getgroups
|
|
system call appeared in
|
|
.Bx 4.2 .
|