125 lines
3.9 KiB
Groff
125 lines
3.9 KiB
Groff
.\"-
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.\" Copyright (c) 2000 Robert N. M. Watson
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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 September 18, 2000
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.Dt CAP_TO_TEXT 3
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.Os
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.Sh NAME
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.Nm cap_to_text
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.Nd convert a capability state in working storage to text
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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 char *
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.Fn cap_to_text "cap_t cap_p" "ssize_t *len_p"
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.Sh DESCRIPTION
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The
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.Fn cap_to_text
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function converts the capability state in working storage identified by
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.Va cap_p
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into a null terminated human-readable string.
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This function allocates any memory necessary to contain the string, and
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returns a pointer to the string.
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If the pointer
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.Va len_p
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if not
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.Va (size_t)NULL ,
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the function shall also return the full length of the string (not including
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null terminator) in the location pointed to by
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.Va len_p .
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The capability state in working storage idenfied by
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.Va cap_p
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shall be completely represented in the returned string.
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.Pp
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This function may cause memory to be allocated.
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The caller should free any releasable memory, when the capability state
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in working memory is no longer required, by calling
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.Xr cap_free 3
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with the
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.Va cap_t
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as an argument.
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.Sh IMPLEMENTATION NOTES
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.Fx Ns 's
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support for POSIX.1e interfaces and features is still under
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development at this time.
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.Sh RETURN VALUES
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Upon successful completion, the function shall return a pointer to the
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text form of the capability state.
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Otherwise, a value of
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.Va (char *)NULL
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shall be returned, and
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.Va errno
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set to indicate the error.
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.Sh ERRORS
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If any of the following conditions occur, the
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.Fn cap_to_text
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function shall return a value of
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.Va (cap_t)NULL
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and set
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.Va errno
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to the corresponding value:
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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_p
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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_p
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argument is invalid, or both.
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.It Bq Er ENOMEM
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The string to be returned requires more memory than is allowed by the
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hardware or system-imposed memory management constraints.
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.El
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.Sh SEE ALSO
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.Xr cap 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 posix1e 3
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.Sh STANDARDS
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POSIX.1e is described in IEEE POSIX.1e draft 17. Discussion
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of the draft continues on the cross-platform POSIX.1e implementation
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mailing list. To join this list, see the
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.Fx
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POSIX.1e implementation
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page for more information.
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.Sh HISTORY
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POSIX.1e support was introduced in
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.Fx 4.0 ,
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and development continues.
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.Sh AUTHORS
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.An Robert N M Watson
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.Sh BUGS
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.Fn cap_to_text
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uses a bounded size (1024 byte) buffer in which to assemble the resulting
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text string.
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If the string requires more space than that buffer provides,
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.Er ENOMEM
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will be returned.
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