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access - determine accessibility of file
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 disallowed 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 for-
(access = 33.)
sys access; name; mode
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