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-.\" Copyright (c) 1980, 1991, 1993
-.\" The Regents of the University of California. 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.
-.\" 3. All advertising materials mentioning features or use of this software
-.\" must display the following acknowledgement:
-.\" This product includes software developed by the University of
-.\" California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\" may be used to endorse or promote products derived from this software
-.\" without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
-.\"
-.\" @(#)access.2 8.2 (Berkeley) 4/1/94
-.\" $Id$
-.\"
-.Dd April 1, 1994
-.Dt ACCESS 2
-.Os BSD 4
-.Sh NAME
-.Nm access
-.Nd check access permissions of a file or pathname
-.Sh SYNOPSIS
-.Fd #include <unistd.h>
-.Ft int
-.Fn access "const char *path" "int mode"
-.Sh DESCRIPTION
-The
-.Fn access
-function checks the accessibility of the
-file named by
-.Fa path
-for the access permissions indicated by
-.Fa mode .
-The value of
-.Fa mode
-is the bitwise inclusive OR of the access permissions to be
-checked
-.Pf ( Dv R_OK
-for read permission,
-.Dv W_OK
-for write permission and
-.Dv X_OK
-for execute/search permission) or the existence test,
-.Dv F_OK .
-All components of the pathname
-.Fa path
-are checked for access permissions (including
-.Dv F_OK ) .
-.Pp
-The real user ID is used in place of the effective user ID
-and the real group access list
-(including the real group ID) are
-used in place of the effective ID for verifying permission.
-.Pp
-Even if a process has appropriate privileges and indicates success for
-.Dv X_OK ,
-the file may not actually have execute permission bits set.
-Likewise for
-.Dv R_OK
-and
-.Dv W_OK .
-.Sh RETURN VALUES
-If
-.Fa path
-cannot be found or if any of the desired access modes would
-not be granted, then a -1 value is returned; otherwise
-a 0 value is returned.
-.Sh ERRORS
-Access to the file is denied if:
-.Bl -tag -width Er
-.It Bq Er ENOTDIR
-A component of the path prefix is not a directory.
-.It Bq Er ENAMETOOLONG
-A component of a pathname exceeded 255 characters,
-or an entire path name exceeded 1023 characters.
-.It Bq Er ENOENT
-The named file does not exist.
-.It Bq Er ELOOP
-Too many symbolic links were encountered in translating the pathname.
-.It Bq Er EROFS
-Write access is requested for a file on a read-only file system.
-.It Bq Er ETXTBSY
-Write access is requested for a pure procedure (shared text)
-file presently being executed.
-.It Bq Er EACCES
-Permission bits of the file mode do not permit the requested
-access, or search permission is denied on a component of the
-path prefix. The owner of a file has permission checked with
-respect to the ``owner'' read, write, and execute mode bits,
-members of the file's group other than the owner have permission
-checked with respect to the ``group'' mode bits, and all
-others have permissions checked with respect to the ``other''
-mode bits.
-.It Bq Er EFAULT
-.Fa Path
-points outside the process's allocated address space.
-.It Bq Er EIO
-An I/O error occurred while reading from or writing to the file system.
-.El
-.Sh SEE ALSO
-.Xr chmod 2 ,
-.Xr stat 2
-.Sh STANDARDS
-The
-.Fn access
-function call is expected to conform to
-.St -p1003.1-90 .
-.Sh CAVEAT
-.Fn Access
-is a potential security hole and
-should never be used.
-.Sh HISTORY
-An
-.Fn access
-function call appeared in
-.At v7 .
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