From owner-freebsd-questions  Sun Aug 18 14:49:27 2002
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Subject: O_ASYNC + SIGIO does not seem to work for UNIX domain sockets
To: freebsd-questions@freebsd.org
Date: Mon, 19 Aug 2002 00:49:17 +0300 (EET DST)
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From: jau@iki.fi (Jukka A. Ukkonen)
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	Hi all,

	Has anyone experienced the same problem as I seem to have
	noticed?
	I tried using O_ASYNC fcntl flag and a SIGIO handler to find
	out when a UNIX domain socket has got something to read while
	my code has bee sitting in sigsuspend(). The SIGIO patently
	*never* arrives, though a lot data has been written to the
	other end of the socket.
	While sitting in the same sigsuspend() SIGINT, SIGTERM, and
	SIGCHLD all get delivered as they should. So, it seems that
	this is somehow related to the UNIX domain sockets only.
	If you have seen the O_ASYNC/FIOASYNC + SIGIO working with
	Internet sockets or terminal lines, it means nothing in my
	case.
	I have seen this happen only with the UNIX domain sockets.

	Any information, similar experiences, or bug fixes would be
	very welcome.


	Cheers,
		// jau
.---  ..-  -.-  -.-  .-    .-  .-.-.-    ..-  -.-  -.-  ---  -.  .  -.
  /    Jukka A. Ukkonen,                            Mawit Ltd, Finland
 /__   M.Sc. (sw-eng & cs)                    (Phone) +358-500-606-671
   /   Internet: Jukka.Ukkonen(a)Mawit.Com      (Home) +358-9-6215-280
  /    Internet: ukkonen(a)nic.funet.fi
 v     Internet: jau(a)iki.fi               

+ + + + My opinions are mine and mine alone, not my employers. + + + +

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