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.\"-
.\" Copyright (c) 2000 Robert N. M. Watson
.\" Copyright (c) 2001 Thomas Moestl
.\" 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 THE 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.
.\"
.\" $FreeBSD$
.\"
.Dd March 21, 2001
.Dt CAP_COPY_EXT 3
.Os
.Sh NAME
.Nm cap_copy_ext , cap_size
.Nd convert a capability state in working storage to an external representation
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/types.h
.In sys/capability.h
.Ft ssize_t
.Fn cap_copy_ext "void *ext_p" "cap_t cap" "ssize_t len"
.Ft ssize_t
.Fn cap_size "cap_t cap"
.Sh DESCRIPTION
The
.Fn cap_copy_ext
function converts the capability state in working storage identified by
.Fa cap
to an opaque contiguous external representation in the buffer
pointed to by
.Fa ext_p .
.Fa len
specifies the maximum number of bytes that may be written into the buffer.
.Pp
An application can use the
.Fn cap_size
function to determine the amount of storage in bytes that are needed for
the external representation of
.Fa cap .
.Sh IMPLEMENTATION NOTES
The format of the external representation is not specified in the POSIX.1e
draft.
Applications that need a portable representation should use
.Xr cap_to_text 3 .
.Pp
This function is appropriate in cases where a persistent representation is
needed that needs not to be portable.
Due to endianess issues, this format might
not even be portable between machines of different architectures running this
implementation.
.Pp
.Xr cap_copy_int 3
can be used to convert the external representation back to a
.Vt cap_t .
.Sh RETURN VALUES
Upon successful completion, the
.Fn cap_copy_ext
function returns the number of bytes written to
.Fa ext_p ,
and
.Fn cap_size
returns the number of bytes needed for the external representation of
.Fa cap .
Otherwise, the value \-1 is returned and the global variable
.Va errno
is set to indicate the error.
.Sh ERRORS
.Fn cap_copy_ext
fails if:
.Bl -tag -width Er
.It Bq Er EINVAL
The
.Fa cap
argument does not refer to a capability state in working storage,
or the
.Fa len
argument is negative.
.It Bq Er ERANGE
The buffer size specified by
.Fa len
argument is too small to hold the external representation.
.El
.Pp
.Fn cap_size
fails if:
.Bl -tag -width Er
.It Bq Er EINVAL
The
.Fa cap
argument does not refer to a capability state in working storage.
.El
.Sh SEE ALSO
.Xr cap_copy_int 3 ,
.Xr cap_free 3 ,
.Xr cap_from_text 3 ,
.Xr cap_get_flag 3 ,
.Xr cap_to_text 3 ,
.Xr posix1e 3
.Sh STANDARDS
This function is expected to conform to the withdrawn
IEEE draft 1003.1e
.Pq Dq POSIX.1e .
.Sh HISTORY
These functions first appeared in
.Fx 5.0 .
.Sh AUTHORS
.An Thomas Moestl Aq tmm@FreeBSD.org
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