On Fri, Jun 15, 2018 at 01:35:17PM +0200, Edgar Fu? wrote: > I guess that's a rater silly/basic question, but ... > > Is there a way to open(.. O_WRONLY ..) an existing named pipe that > currently has no reader such that > -- the open() will neither block nor fail > -- subsequent write()s to that fd will > -- succeeed if someone started reading in the meantime > -- block/return EWOULDBLOCK if still no-one is reading > ? > > Of course there's the work-around of lazily open()ing the fd before each > write() call.
Won't O_NONBLOCK cover this? I don't think you can distinguish "buffer is full right now" from "no reader" though. Depending on what you're doing you might want a stream socket instead of a pipe. -- David A. Holland dholl...@netbsd.org
