Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!dgeorge
From: dgeorge@svax.cs.cornell.edu (David George)
Newsgroups: comp.sys.hp
Subject: Enabling SIGIO interrupts on stream sockets
Message-ID: <29216@cornell.UUCP>
Date: 21 Jun 89 20:08:18 GMT
Sender: nobody@cornell.UUCP
Reply-To: dwg@terra.graphics.cornell.edu (David George)
Distribution: comp.sys.hp
Organization: Cornell Univ. Program of Computer Graphics, Ithaca NY
Lines: 25

I'm trying to trap to a handler routine each time that data
becomes available on a stream-type communication socket.  I'm using
HP-UX on a Series 800 machine (HP Release A.B3.00.5B).

The HP manuals suggest the following sequence of commands:

	pid = getpid();
	arg = 1;
	signal(SIGIO, my_handling_routine);
	ioctl(fildes, FIOSSAIOOWN, &pid);
	ioctl(fildes, FIOSSAIOSTAT, &arg);

So now a SIGIO signal should be generated each time that data becomes
available on socket fildes.  Instead, I get an "Operation not supported
on socket" error for the first ioctl() call.

A 4.3BSD Tutorial gave the alternative solution:

	signal(SIGIO, my_handling_routine);
	fcntl(fildes, F_SETOWN, getpid());
	fcntl(fildes, F_SETFL, FASYNC);

But F_SETOWN and FASYNC are not defined on my system.  Any ideas?

Dave George