How to do a non-blocking write of more than one char?

[Guy Harris]

>If select() says the fd is writable, is the write() guaranteed not to
>block?

Which "write()"?  Not all "write()"s are guaranteed not to block.  It's
guaranteed that you can write *some* amount of data without blocking,
but no guarantee as to how much is made, in general.  Sorry, but you
really *are* expected to use non-blocking I/O in that case....