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BSD 2.11 - man page for access (bsd section 2)

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ACCESS(2)										ACCESS(2)

       access - determine accessibility of file

       #include <sys/file.h>

       #define R_OK    4/* test for read permission */
       #define W_OK    2/* test for write permission */
       #define X_OK    1/* test for execute (search) permission */
       #define F_OK    0/* test for presence of file */

       accessible = access(path, mode)
       int accessible;
       char *path;
       int mode;

       Access  checks the given file path for accessibility according to mode, which is an inclu-
       sive or of the bits R_OK, W_OK and X_OK.  Specifying mode as F_OK (i.e., 0) tests  whether
       the directories leading to the file can be searched and the file exists.

       The real user ID and the group access list (including the real group ID) are used in veri-
       fying permission, so this call is useful to set-UID programs.

       Notice that only access bits are checked.  A directory may be  indicated  as  writable  by
       access,	but  an  attempt  to open it for writing will fail (although files may be created
       there); a file may look executable, but execve will fail unless it is in proper format.

       If 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.

       Access to the file is denied if one or more of the following are true:

       [ENOTDIR]      A component of the path prefix is not a directory.

       [EINVAL]       The pathname contains a character with the high-order bit set.

       [ENAMETOOLONG] A  component  of a pathname exceeded 255 characters, or an entire path name
		      exceeded 1023 characters.

       [ENOENT]       The named file does not exist.

       [EACCES]       Search permission is denied for a component of the path prefix.

       [ELOOP]	      Too many symbolic links were encountered in translating the pathname.

       [EROFS]	      Write access is requested for a file on a read-only file system.

       [ETXTBSY]      Write access is requested for a pure procedure (shared text) file  that  is
		      being executed.

       [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.

       [EFAULT]       Path points outside the process's allocated address space.

       [EIO]	      An I/O error occurred while reading from or writing to the file system.

       chmod(2), stat(2)

4th Berkeley Distribution		   May 22, 1986 				ACCESS(2)
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