v7 man page for access

ACCESS(2)							System Calls Manual							 ACCESS(2)

NAME
       access - determine accessibility of file

SYNOPSIS
       access(name, mode)
       char *name;

DESCRIPTION
       Access  checks  the  given  file  name  for  accessibility  according to mode, which is 4 (read), 2 (write) or 1 (execute) or a combination
       thereof.  Specifying mode 0 tests whether the directories leading to the file can be searched and the file exists.

       An appropriate error indication is returned if name cannot be found or if any of the desired access modes would not be granted.	On  disal-
       lowed accesses -1 is returned and the error code is in errno.  0 is returned from successful tests.

       The  user and group IDs with respect to which permission is checked are the real UID and GID of the process, so this call is useful to set-
       UID programs.

       Notice that it is only access bits that are checked.  A directory may be announced 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 exec will fail unless it is in proper format.

SEE ALSO
       stat(2)

ASSEMBLER
       (access = 33.)
       sys access; name; mode

																	 ACCESS(2)