Date: Tue, 18 Nov 1997 19:28:41 -0800 (PST) From: "Jamil J. Weatherbee" <jamil@trojanhorse.ml.org> To: hackers@freebsd.org Subject: vnode.h and IO_NDELAY (help!!) Message-ID: <Pine.BSF.3.96.971118192251.175A-100000@trojanhorse.ml.org>
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I can't find a single code fragment in any device driver that checks ioflags in the read routine to see if IO_NDELAY is set. My driver implements two distinct read modes: blocking and non-blocking. I need to check the ioflags passed to the read routine. I assume i would just #include <sys/vnode.h> and check up against IO_NDELAY, why can't I find any examples in a device driver of this being done? Am I going about the whole problem the wrong way? Specifically if a user issues a read on an aiox device opened with the O_NONBLOCK flag, or later performs an fcntl on the descriptor to make it non-blocking I want to detect that when they come into the read routine. If the vnode is blocking, I am allowed to tsleep on the fifo to complete the uio otherwise just get what is available and return. Am I making some grave mistake in how I am handling this???
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