From: Brian Foster (blf at domain utvinternet.ie)
Date: Wed 31 Jul 2002 - 17:35:56 IST
| Date: Wed, 31 Jul 2002 15:13:23 +0100
| From: Ronan Cunniffe <ronan at domain cunniffe.net>
| Um, my test was to tee to a fifo I didn't read from... resulting
| in the other reader hanging around forever.... not realising that
| never-opened-for-reading and opened-and-later-closed might be
ah! yes! this is one of those gotchas everyone stumbles
over. the writer of a never-opened-for-reading pipe will
quickly block (as soon as the pipe's limited buffer fills
up). but the writer of opened-and-later-closed pipe gets
an EPIPE error (and the usually-terminal SIGPIPE signal).
the typical stumble is someone creates an anonymous pipe
with pipe(2), but forgets to close(2) the reader's fd in
the writer-process (or visa-versa) .... and then wonders
why the real reader never sees an EOF and/or the writer
is never gets an EPIPE/SIGPIPE. various FAQs and many
books probably discuss this topic in depth to the death.
| Sensible behaviour has now been observed.
good! and good luck.
-- «How many surrealists does it take to | Brian Foster Dublin, Ireland change a lightbulb? Three. One calms | e-mail: blf at domain utvinternet.ie the warthog, and two fill the bathtub | mobile: (+353 or 0)86 854 9268 with brightly-coloured machine tools.» | http://www.blf.utvinternet.ie Stop E$$o (ExxonMobile): «Whatever you do, don't buy Esso --- they don't give a damn about global warming.» http://www.stopesso.com Supported by Greenpeace, Friends of the Earth, and numerous others...
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