minix/lib/libc/gen/extattr_copy_file.3
Lionel Sambuc f14fb60209 Libraries updates and cleanup
* Updating common/lib
 * Updating lib/csu
 * Updating lib/libc
 * Updating libexec/ld.elf_so
 * Corrected test on __minix in featuretest to actually follow the
   meaning of the comment.
 * Cleaned up _REENTRANT-related defintions.
 * Disabled -D_REENTRANT for libfetch
 * Removing some unneeded __NBSD_LIBC defines and tests

Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
2013-01-14 11:36:26 +01:00

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.\" $NetBSD: extattr_copy_file.3,v 1.2 2011/12/16 15:21:13 manu Exp $
.\"
.\" Copyright (c) 2001 Dima Dorfman <dd@FreeBSD.org>
.\" Copyright (c) 2011 Emmanuel Dreyfus <manu@NetBSD.org>
.\" 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
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.\" 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
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" FreeBSD: src/lib/libc/posix1e/extattr.3,v 1.5 2002/12/12 17:25:53 ru Exp
.\"
.Dd December 16, 2011
.Dt EXTATTR_COPY_FILE 3
.Os
.Sh NAME
.Nm extattr_copy_file ,
.Nm extattr_copy_fd ,
.Nm extattr_copy_link ,
.Nm cpxattr ,
.Nm fcpxattr ,
.Nm lcpxattr
.Nd copy extended attributes from a file to another one
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/extattr.h
.Ft int
.Fn extattr_copy_file "const char *from" "const char *to" "int namespace"
.Ft int
.Fn extattr_copy_fd "int from_fd" "int to_fd" "int namespace"
.Ft int
.Fn extattr_copy_link "const char *from" "const char *to" "int namespace"
.Ft int
.Fn cpxattr "const char *from" "const char *to"
.Ft int
.Fn fcpxattr "int from_fd" "int to_fd"
.Ft int
.Fn lcpxattr "const char *from" "const char *to"
.Sh DESCRIPTION
.Fn extattr_copy_file
copies extended attributes of namespace
.Ar namespace
from a file to another one.
.Fn extattr_copy_fd
does the same using open file descriptors, and
.Fn extattr_copy_link
does the same as
.Fn extattr_copy_file
but operates on symbolic links themselves instead of their targets.
.Pp
.Fn cpxattr ,
.Fn fcpxattr ,
and
.Fn lcpxattr
respectively work the same was as
.Fn extattr_copy_file ,
.Fn extattr_copy_fd ,
and
.Fn extattr_copy_link ,
but will copy extended attributes from all namespaces accessible to the user,
silently skiping unaccessible namespaces.
.Pp
Please note that none of the extended attribute copying functions are atomic.
.Sh RETURN VALUES
If any of the calls are unsuccessful, the value \-1 is returned
and the global variable
.Va errno
is set to indicate the error.
.Sh ERRORS
Extended attribute copying functions may raise errors produced by
.Xr extattr_list_file 2
and
.Xr extattr_get_file 2 .
.Sh SEE ALSO
.Xr getextattr 1 ,
.Xr extattr_get_file 2 ,
.Xr extattr_namespace_to_string 3 ,
.Xr extattr 9
.Sh HISTORY
Extended attribute support was developed as part of the
.Tn TrustedBSD
Project, and introduced in
.Fx 5.0
and
.Nx 3.0 .
It was developed to support security extensions requiring additional labels
to be associated with each file or directory.