File: acl_to_text.3

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.\" Access Control Lists manual pages
.\"
.\" (C) 2002 Andreas Gruenbacher, <a.gruenbacher@bestbits.at>
.\"
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
.\"
.\" The GNU General Public License's references to "object code"
.\" and "executables" are to be interpreted as the output of any
.\" document formatting or typesetting system, including
.\" intermediate and printed output.
.\"
.\" This manual is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
.\" GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public
.\" License along with this manual.  If not, see
.\" <http://www.gnu.org/licenses/>.
.\"
.Dd March 23, 2002
.Dt ACL_FROM_TEXT 3
.Os "Linux ACL"
.Sh NAME
.Nm acl_to_text
.Nd convert an ACL to text
.Sh LIBRARY
Linux Access Control Lists library (libacl, \-lacl).
.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 the argument
.Va acl
into a
.Li NULL
terminated character string.  If the pointer
.Va len_p
is not
.Li NULL ,
then the function returns the length of the string (not
including the
.Li NULL
terminator) in the location pointed to by
.Va len_p .
The format of the text string returned by
.Fn acl_to_text
is the long text form defined in
.Xr acl 5 .
The ACL referred to by
.Va acl
is not changed.
.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
returned by
.Fn acl_to_text
as an argument.
.Sh RETURN VALUE
On success, this function returns a pointer to the
long text form of the ACL.
On error, a value of
.Li (char *)NULL
is returned, and
.Va errno
is set appropriately.
.Sh ERRORS
If any of the following conditions occur, the
.Fn acl_to_text
function returns a value of
.Li (char *)NULL
and sets
.Va errno
to the corresponding value:
.Bl -tag -width Er
.It Bq Er EINVAL
The argument
.Va acl
is not a valid pointer to an ACL.
.Pp
The ACL referenced 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 system-imposed memory management constraints.
.El
.Sh STANDARDS
IEEE Std 1003.1e draft 17 (\(lqPOSIX.1e\(rq, abandoned)
.Sh SEE ALSO
.Xr acl_free 3 ,
.Xr acl_from_text 3 ,
.Xr acl_to_any_text 3 ,
.Xr acl 5
.Sh AUTHOR
Derived from the FreeBSD manual pages written by
.An "Robert N M Watson" Aq rwatson@FreeBSD.org ,
and adapted for Linux by
.An "Andreas Gruenbacher" Aq a.gruenbacher@bestbits.at .