.\"-
.\" Copyright (c) 2000, 2002 Robert N. M. Watson
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.\" This software was developed by Robert Watson for the TrustedBSD Project.
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.\" $FreeBSD: src/lib/libc/posix1e/acl_to_text.3,v 1.15 2002/12/29 20:52:42 rwatson Exp $
.\"
.Dd January 28, 2000
.Dt ACL_TO_TEXT 3
.Os
.Sh NAME
.Nm acl_to_text
.Nd convert an ACL to text
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/types.h
.In sys/acl.h
.Ft char *
.Fn acl_to_text "acl_t acl" "ssize_t *len_p"
.Sh DESCRIPTION
The
.Fn acl_to_text
function translates the ACL pointed to by argument
.Va acl
into a NULL terminated character string.  If the pointer
.Va len_p
is not NULL, then the function shall return the length of the string (not
including the NULL terminator) in the location pointed to by
.Va len_p .
The format of the text string returned by
.Fn acl_to_text
for an ACL of type ACL_TYPE_EXTENDED differs from that specified by the
POSIX.1e standard, and this function cannot translate between formats.
.Pp
This function allocates any memory necessary to contain the string and
returns a pointer to the string.  The caller should free any releasable
memory, when the new string is no longer required, by calling
.Xr acl_free 3
with the
.Va (void*)char
as an argument.
.Sh RETURN VALUES
Upon successful completion, the function shall return a pointer to the
long text form of an ACL.  Otherwise, a value of
.Va (char*)NULL
shall be returned and
.Va errno
shall be set to indicate the error.
.Sh ERRORS
If any of the following conditions occur, the
.Fn acl_to_text
function shall return a value of
.Va (acl_t)NULL
and set
.Va errno
to the corresponding value:
.Bl -tag -width Er
.It Bq Er EINVAL
Argument
.Va acl
does not point to a valid ACL.
.Pp
The ACL denoted by
.Va acl
contains one or more improperly formed ACL entries, or for some other
reason cannot be translated into a text form of an ACL.
.It Bq Er ENOMEM
The character string to be returned requires more memory than is allowed
by the hardware or software-imposed memory management constraints.
.El
.Sh SEE ALSO
.Xr acl 3 ,
.Xr acl_free 3 ,
.Xr acl_from_text 3 ,
.Xr posix1e 3
.Sh STANDARDS
POSIX.1e is described in IEEE POSIX.1e draft 17.
.Sh AUTHORS
.An Michael Smith
.An Robert N M Watson