Return the best approximation of the number of columns of the terminal at PORT, trying to guess a reasonable value if all else fails. The result is always a positive integer.

Get the extended attribute value for KEY on FILE.

Perform locking OPERATION on the file beneath FD-OR-PORT. OPERATION must be a symbol, one of 'read-lock, 'write-lock, or 'unlock. When WAIT? is true, block until the lock is acquired; otherwise, thrown an 'flock-error' exception if it's already taken.

Return the address of network interface NAME. The result is an object of the same type as that returned by 'make-socket-address'.

Change the root file system to NEW-ROOT and move the current root file system to PUT-OLD.

Return the mounts points for currently mounted file systems.