Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!unido!marco!leo
From: leo@marco.UUCP (Matthias Pfaller)
Newsgroups: comp.os.minix
Subject: read/writes to pipes with O_NDELAY set
Keywords: O_NDELAY pipes
Message-ID: <478@alice.marco.UUCP>
Date: 14 Sep 90 11:31:07 GMT
Organization: marco GmbH, 8047 Karlsfeld, West-Germany
Lines: 20

according to the manuals of our Unix-box reads and writes to a pipe
with O_NDELAY set should behave as follows:
>
>          If the file being written is a pipe (or FIFO) and the
>          O_NDELAY flag of the file flag word is set, then write to a
>          full pipe (or FIFO) will return a count of 0.  Otherwise
>          (O_NDELAY clear), writes to a full pipe (or FIFO) will block
>          until space becomes available.
>
>
>          When attempting to read from an empty pipe (or FIFO):
>
>               If O_NDELAY is set, the read will return a 0.
>
>               If O_NDELAY is clear, the read will block until data is
>               written to the file or the file is no longer open for
>               writing.
>
Minix returns EAGAIN; what is correct, what says Posix?
	Matthias Pfaller