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From: ken@syd.dit.CSIRO.AU (Ken Yap)
Subject: Q: how do I detect EOF on a select(2)ed fd?
Message-ID: <3akj9mINN5nb@seurat.syd.dit.csiro.au>
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Sender: ken@syd.dit.csiro.au (Ken Yap)
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Reply-To: ken@syd.dit.csiro.au (Ken Yap)
Organization: CSIRO Division of Information Technology
Date: Sat, 19 Nov 1994 10:16:22 GMT
Lines: 23
In my server, I've got a fd which is a TCP socket. For testing I
connect to it with telnet. I send some data, then close the connection
by quitting telnet. The problem is that I don't see the EOF. My code is
currently like this:
int sock_rbused(int *sock)
{
long nbytes;
fd_set readfds;
int i;
FD_ZERO(&readfds);
FD_SET(*sock, &readfds);
i = select(32, &readfds, 0, 0, 0);
i = ioctl(*sock, FIONREAD, &nbytes);
if (i < 0)
return (i);
return ((int)nbytes);
}
I thought FIONREAD would return -1 on EOF but it doesn't. I also tried
calling select with exceptionfds but no bit is set on EOF. So how do I
detect EOF without blocking?