> In either case, a SIGPIPE can be sent asynchronously.

My expectation (and I think this is an accurate expecation) is that a) read does not cause a SIGPIPE, read on a widowed pipe returns a zero count read as indication of EOF. b) write on a widowed pipe raises SIGPIPE before the write returns. c) write to a pipe that is valid will not raise SIGPIPE if the pipe is widowed without being read from.

Yes, you could get a SIGPIPE from anywhere at anytime, but unless someone is having fun on your system with random kills, you won't actually get one except immediately after a write to a pipe. With a timer based asynchronous write, this changes to potentially happening any time.

This could be fine if it was well documented and expected, but it would be a mess to add it into the libcs at this point. Probably a mess to add it to basic output buffering in most languages.