ACCESS(2)

NAME
access - determine accessibility of file

SYNOPSIS
#include <unistd.h>

int access (const char *path, int mode);

DESCRIPTION
path points to a path name naming a file. access() checks the named file for accessibility according to mode, which is an inclusive or of the following bits:

    R_OK
        Test for read permission.

    W_OK
        Test for write permission. Under GNO, a file must have all three of its GS/OS write, rename, and destroy bits set to be considered writable.

    X_OK
        Test for execute or search permission. Under GNO, the test will pass if the file is of type EXE, S16, a directory, or of type SRC with an EXEC auxiliary type.

The following value may also be supplied for mode:

    F_OK
        test whether the directories leading to the file can be searched and the file exists.

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.

RETURN VALUES
access() returns zero on success. On failure it returns -1 and sets errno.

ERRORS

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

    The file access permissions do not permit the requested access to the file named by path.

EFAULT
    path points outside the process's allocated address space.

EINVAL
    An invalid value was specified for mode.

    The length of the path argument exceeds FILENAME_MAX.

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

ELOOP
    Too many symbolic links were encountered in translating path. (Not currently possible under GNO.)

ENOENT
    The file named by path does not exist.

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

SYSTEM V ERRORS
In addtion to the above, the following may also occur:

ENOENT
    path points to an empty string.

BUGS
Nothing special is done for the AppleShare FST.

SEE ALSO
chmod(2V), stat(2V)