.\"-
.\" Copyright (c) 2001 Chris D. Faulhaber
.\" 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
.\"
.\" $FreeBSD: head/lib/libc/posix1e/acl_get_entry.3 267774 2014-06-23 08:25:03Z bapt $
.\"
.Dd April 13, 2001
.Dt ACL_GET_ENTRY 3
.Os
.Sh NAME
.Nm acl_get_entry
.Nd retrieve an ACL entry from an ACL
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/types.h
.In sys/acl.h
.Ft int
.Fn acl_get_entry "acl_t acl" "int entry_id" "acl_entry_t *entry_p"
.Sh DESCRIPTION
The
.Fn acl_get_entry
function
is a POSIX.1e call that retrieves a descriptor for an ACL entry
specified by the argument
.Fa entry_d
within the ACL indicated by the argument
.Fa acl .
.Pp
If the value of
.Fa entry_id
is
.Dv ACL_FIRST_ENTRY ,
then the function will return in
.Fa entry_p
a descriptor for the first ACL entry within
.Fa acl .
If a call is made to
.Fn acl_get_entry
with
.Fa entry_id
set to
.Dv ACL_NEXT_ENTRY
when there has not been either an initial successful call to
.Fn acl_get_entry ,
or a previous successful call to
.Fn acl_create_entry ,
.Fn acl_delete_entry ,
.Fn acl_dup ,
.Fn acl_from_text ,
.Fn acl_get_fd ,
.Fn acl_get_file ,
.Fn acl_set_fd ,
.Fn acl_set_file ,
or
.Fn acl_valid ,
then the result is unspecified.
.Sh RETURN VALUES
If the
.Fn acl_get_entry
function successfully obtains an ACL entry, a value of 1 is returned.
If the ACL has no ACL entries, the
.Fn acl_get_entry
returns a value of 0.
If the value of
.Fa entry_id
is
.Dv ACL_NEXT_ENTRY
and the last ACL entry in the ACL has already been returned by a
previous call to
.Fn acl_get_entry ,
a value of 0 will be returned until a successful call with
.Fa entry_id
of
.Dv ACL_FIRST_ENTRY
is made.
Otherwise, a value of -1 will be returned and
the global variable
.Va errno
will be set to indicate the error.
.Sh ERRORS
The
.Fn acl_get_entry
fails if:
.Bl -tag -width Er
.It Bq Er EINVAL
Argument
.Fa acl
does not point to a valid ACL.
Argument
.Fa entry_id
is neither
.Dv ACL_FIRST_ENTRY
nor
.Dv ACL_NEXT_ENTRY .
.El
.Sh SEE ALSO
.Xr acl 3 ,
.Xr acl_calc_mask 3 ,
.Xr acl_create_entry 3 ,
.Xr acl_delete_entry 3 ,
.Xr acl_dup 3 ,
.Xr acl_from_text 3 ,
.Xr acl_get_fd 3 ,
.Xr acl_get_file 3 ,
.Xr acl_init 3 ,
.Xr acl_set_fd 3 ,
.Xr acl_set_file 3 ,
.Xr acl_valid 3 ,
.Xr posix1e 3
.Sh STANDARDS
POSIX.1e is described in IEEE POSIX.1e draft 17.
.Sh HISTORY
POSIX.1e support was introduced in
.Fx 4.0 .
The
.Fn acl_get_entry
function was added in
.Fx 5.0 .
.Sh AUTHORS
The
.Fn acl_get_entry
function was written by
.An Chris D. Faulhaber Aq Mt jedgar@fxp.org .