7bb862d793
support functions:
cap_subset_np() - Is cap1 a subset of cap2
cap_equal_np() - Is cap1 equal to cap2
o Introduce implementations of POSIX.1e capability support functions:
cap_copy_ext() - Externalize capability
cap_copy_int() - Internalize capability
cap_size() - Determine size required for cap_copy_ext()
Submitted by: tmm
Obtained from: TrustedBSD Project
135 lines
3.8 KiB
Groff
135 lines
3.8 KiB
Groff
.\"-
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.\" Copyright (c) 2000 Robert N. M. Watson
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.\" Copyright (c) 2001 Thomas Moestl
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd March 21, 2001
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.Dt CAP_COPY_EXT 3
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.Os
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.Sh NAME
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.Nm cap_copy_ext
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.Nd Convert a Capability State in Working Storage to an External Representation
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include <sys/types.h>
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.Fd #include <sys/capability.h>
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.Ft ssize_t
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.Fn cap_copy_ext "void *ext_p" "cap_t cap" "ssize_t len"
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.Ft ssize_t
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.Fn cap_size "cap_t cap"
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.Sh DESCRIPTION
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The
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.Nm
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function converts the capability state in working storage identified by
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.Va cap
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to an opaque contiguous external representation in the buffer
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.Va ext_p
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points to.
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.Va size
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specifies the maximum number of bytes that may be written into the buffer.
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.Pp
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An application can use the
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.Nm cap_size
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function to determine the amount of storage in bytes that are needed for
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the external representation of
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.Va cap .
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.Sh IMPLEMENTATION NOTES
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The format of the external representation is not specified in the POSIX.1e
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draft. Applications that need a portable representation should use
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.Xr cap_to_text 3 .
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.Pp
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This function is appropriate in cases where a persistent representation is
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needed that needs no to be portable. Due to endianess issues, this format might
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not even be portable between machines of different architectures running this
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implementation.
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.Pp
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.Xr cap_copy_int 3
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can be used to convert the external representation back to a
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.Va cap_t .
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.Sh RETURN VALUES
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Upon successful completion, the
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.Nm
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function returns the number of bytes written to
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.Va ext_t .
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.Nm cap_size
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returns the number of bytes needed for the external representation of
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.Va cap
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if it is valid.
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On error, both return
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.Va -1
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and set
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.Va errno
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appropriately.
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.Sh ERRORS
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.Nm
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can set
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.Dv errno
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to the following values:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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Either the
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.Va cap
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argument does not refer to a capability state in working storage
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or the
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.Va len
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argument is below zero, or both.
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.It Bq Er ERANGE
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The buffer size specified by
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.Va len
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argument is too small to hold the external representation.
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.El
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.Pp
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.Nm cap_size
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can set
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.Dv errno
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to the following values:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The
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.Va cap
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argument does not refer to a capability state in working storage.
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.El
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.Sh SEE ALSO
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.Xr cap_copy_int 3 ,
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.Xr cap_free 3 ,
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.Xr cap_from_text 3 ,
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.Xr cap_get_flag 3 ,
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.Xr cap_to_text 3 ,
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.Xr posix1e 3
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.Sh STANDARDS
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This function is expected to conform to the withdrawn
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IEEE draft 1003.1e
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.Po
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.Do POSIX.1e
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.Dc
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.Pc .
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.Sh HISTORY
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This function first appeared in
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.Fx 5.0 .
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.Sh AUTHORS
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.An Thomas Moestl Aq tmm@FreeBSD.org
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