> Pipes cannot be configured in non-blocking mode on Windows. It sounds dangerous to call a blocking syscall in a signal handler.>> In fact, it works to write the signal number into a pipe on Windows, but I'm worried about the blocking behaviour.OK, but if someone passes a socket in blocking mode, it will be accepted.I don't understand why, if you're worried about a blocking write, youdon't just check that the FD passed is in non-blocking mode. It'sconceptually cleaner, more direct and safer.Also, I think there's another issue open on the tracker to check justthat, so I'd leave this check out here.