Any idea how I can get EINVAL from a read() call? The man page suggests

     [EINVAL]      The pointer associated with d was negative.

     [EINVAL]      The total length of the I/O is more than can be expressed
                   by the ssize_t return value.

but this is coming from a read of a dvd, with fd=3, requesting 9*2048 bytes.
Or maybe I don't understand "pointer associated with". d=3, so >0. What is
the pointer associated with fd=3?

Cheers,

Patrick