Re: Bug with FIONREAD for TCP?

[David S. Miller]

   Date: 	Mon, 10 Apr 2000 00:15:20 -0600
   From: Richard Gooch <[e-mail]>

     Hi, all. For at least a month or two I've noticed that FIONREAD
   yields 1 byte on a freshly closed TCP connection, rather than 0.

   The server creates a socket, binds to a port and listens and
   accepts the first connection. It does a select(2) on the FD, and
   upon an input event, calls ioctl(2) with FIONREAD. This yields 1
   byte readable. Any attempt to read that byte fails, as it's not
   really there.

It's the sequence byte taken up by the initial SYN.  It's probably
wrong.

I don't know if other systems report it this way too, do you have a
way to check this out?

Later,
David S. Miller
[e-mail]