Returns @true if an error occurred in the last IO operation.
Use this function to check for an error condition after one of the
following calls: Discard, Peek, Read, ReadMsg, Unread, Write, WriteMsg.
Returns @true if an error occurred in the last IO operation.
Use this function to check for an error condition after one of the
following calls: Discard, Peek, Read, ReadMsg, Unread, Write, WriteMsg.