Problem: can't close pipe in "expecting chunk" state

[hintjens]

Symptom: when doing a blocked read and EINTR occurs, the server state was stuck in expecting chunk, and would't accept a close command.

Duplicate of issue #26, I think.

[rpedde]

Same for "expecting data" state as well, a read with a writer connected but no writes yet is in expecting data and won't honor a close.

More accurately, sequence of events is:

open read pipe
open write pipe
read one byte from the read pipe with no timeout -- blocks
send SIGALRM - read returns with EINTR
subsequent close on the read pipe blocks indefinitely

[hintjens]

I need to refine the responses to a read then, so a close can return close-ok and the read can then return read-error.