167 lines
4.8 KiB
Groff
167 lines
4.8 KiB
Groff
.\"-
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.\" Copyright (c) 2000, 2002 Robert N. M. Watson
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.\" All rights reserved.
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.\"
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.\" This software was developed by Robert Watson for the TrustedBSD Project.
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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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.Dd June 25, 2009
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.Dt ACL_GET 3
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.Os
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.Sh NAME
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.Nm acl_get_fd ,
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.Nm acl_get_fd_np ,
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.Nm acl_get_file ,
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.Nm acl_get_link_np
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.Nd get an ACL for a file
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/acl.h
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.Ft acl_t
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.Fn acl_get_fd "int fd"
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.Ft acl_t
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.Fn acl_get_fd_np "int fd" "acl_type_t type"
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.Ft acl_t
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.Fn acl_get_file "const char *path_p" "acl_type_t type"
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.Ft acl_t
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.Fn acl_get_link_np "const char *path_p" "acl_type_t type"
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.Sh DESCRIPTION
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The
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.Fn acl_get_fd ,
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.Fn acl_get_file ,
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.Fn acl_get_link_np ,
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and
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.Fn acl_get_fd_np
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each allow the retrieval of an ACL from a file.
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The
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.Fn acl_get_fd
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is a POSIX.1e call that allows the retrieval of an ACL of type
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ACL_TYPE_ACCESS
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from a file descriptor.
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The
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.Fn acl_get_fd_np
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function
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is a non-portable form of
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.Fn acl_get_fd
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that allows the retrieval of any type of ACL from a file descriptor.
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The
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.Fn acl_get_file
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function is a POSIX.1e call that allows the retrieval of a
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specified type of ACL from a file by name;
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.Fn acl_get_link_np
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is a non-portable variation on
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.Fn acl_get_file
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which does not follow a symlink if the target of the call is a
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symlink.
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.Pp
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These functions may cause memory to be allocated.
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The caller should free
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any releasable memory, when the new ACL is no longer required, by calling
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.Xr acl_free 3
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with the
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.Va (void *)acl_t
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as an argument.
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.Pp
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The ACL in the working storage is an independent copy of the ACL associated
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with the object referred to by
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.Va fd .
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The ACL in the working storage shall not participate in any access control
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decisions.
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.Pp
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Valid values for the
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.Va type
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argument are:
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.Bl -column -offset 3n "ACL_TYPE_DEFAULT"
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.It ACL_TYPE_ACCESS POSIX.1e access ACL
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.It ACL_TYPE_DEFAULT POSIX.1e default ACL
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.It ACL_TYPE_NFS4 NFSv4 ACL
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.El
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.Pp
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The ACL returned will be branded accordingly.
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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 ACL
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that was retrieved.
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Otherwise, a value of
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.Va (acl_t)NULL
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shall be returned, and
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.Va errno
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shall be 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 acl_get_fd
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function shall return a value of
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.Va (acl_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 EACCES
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Search permission is denied for a component of the path prefix, or the
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object exists and the process does not have appropriate access rights.
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.It Bq Er EBADF
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The
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.Va fd
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argument is not a valid file descriptor.
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.It Bq Er EINVAL
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The ACL type passed is invalid for this file object.
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.It Bq Er ENAMETOOLONG
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A component of a pathname exceeded 255 characters, or an
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entire path name exceeded 1023 characters.
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.It Bq Er ENOENT
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The named object does not exist, or the
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.Va path_p
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argument points to an empty string.
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.It Bq Er ENOMEM
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Insufficient memory available to fulfill request.
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.It Bq Er EOPNOTSUPP
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The file system does not support ACL retrieval.
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.El
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.Sh SEE ALSO
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.Xr acl 3 ,
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.Xr acl_free 3 ,
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.Xr acl_get 3 ,
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.Xr acl_get_brand_np 3 ,
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.Xr acl_set 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.
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Discussion
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of the draft continues on the cross-platform POSIX.1e implementation
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mailing list.
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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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