Date: Tue, 23 Oct 2001 20:29:40 -0500 From: Alfred Perlstein <bright@mu.org> To: Kenneth Wayne Culver <culverk@wam.umd.edu> Cc: freebsd-hackers@freebsd.org Subject: Re: domain sockets question (don't laugh) Message-ID: <20011023202940.V15052@elvis.mu.org> In-Reply-To: <Pine.GSO.4.21.0110232114060.12407-100000@rac1.wam.umd.edu>; from culverk@wam.umd.edu on Tue, Oct 23, 2001 at 09:22:29PM -0400 References: <Pine.GSO.4.21.0110232114060.12407-100000@rac1.wam.umd.edu>
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* Kenneth Wayne Culver <culverk@wam.umd.edu> [011023 20:22] wrote:
> While I've been coding for a long time, and am fairly decent at coding in
> the kernel, I've never really had a chance to get into sockets
> programming. So I thought I'd write a simple set of programs to see how
> things work. From what I understand, when you read on a socket, you have
> to do it in a loop because it won't block and wait for the total amount of
> data specified, while write will not return until all specified data has
> been written. My problem is that I've set up a read loop to read in chunks
> that are the size of the recv/send buffers (16384 bytes) from the socket
> (until the end of course, when it reads only what's left), then when I
> write from one program to the socket for the other program to read, the
> program that's writing exits with the message "broken pipe" while the
> program that's reading doesn't think there was any error, reads the
> amount of data it should have read (although I'm not sure if there's any
> data there). Can anyone tell me what's going on?
You're getting SIGPIPE because the reader has closed the pipe you're
trying to write to. See the signal/sigaction manpage on how to
block/handle this signal.
Get a copy of stevens. :)
--
-Alfred Perlstein [alfred@freebsd.org]
'Instead of asking why a piece of software is using "1970s technology,"
start asking why software is ignoring 30 years of accumulated wisdom.'
http://www.morons.org/rants/gpl-harmful.php3
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