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SubjectRe: Sendmail 8.9.0 claims a Linux kernel bug
On 24 Jun 1998, Ben Gertzfield wrote:

> "Connection timed out" is not documented as a valid return from
> accept(2) and this is believed to be a bug in the Linux kernel.

What a lame excuse. Anyhow, here's what I did in Apache, where I care
more about reliability than whether man pages are up to date. Someone may
want to use this to form a better patch for sendmail... or to get the man
pages updated.

Dean

/* Our old behaviour here was to continue after accept()
* errors. But this leads us into lots of troubles
* because most of the errors are quite fatal. For
* example, EMFILE can be caused by slow descriptor
* leaks (say in a 3rd party module, or libc). It's
* foolish for us to continue after an EMFILE. We also
* seem to tickle kernel bugs on some platforms which
* lead to never-ending loops here. So it seems best
* to just exit in most cases.
*/
switch (errno) {
#ifdef EPROTO
/* EPROTO on certain older kernels really means
* ECONNABORTED, so we need to ignore it for them.
* See discussion in new-httpd archives nh.9701
* search for EPROTO.
*
* Also see nh.9603, search for EPROTO:
* There is potentially a bug in Solaris 2.x x<6,
* and other boxes that implement tcp sockets in
* userland (i.e. on top of STREAMS). On these
* systems, EPROTO can actually result in a fatal
* loop. See PR#981 for example. It's hard to
* handle both uses of EPROTO.
*/
case EPROTO:
#endif
#ifdef ECONNABORTED
case ECONNABORTED:
#endif
/* Linux generates the rest of these, other tcp
* stacks (i.e. bsd) tend to hide them behind
* getsockopt() interfaces. They occur when
* the net goes sour or the client disconnects
* after the three-way handshake has been done
* in the kernel but before userland has picked
* up the socket.
*/
#ifdef ECONNRESET
case ECONNRESET:
#endif
#ifdef ETIMEDOUT
case ETIMEDOUT:
#endif
#ifdef EHOSTUNREACH
case EHOSTUNREACH:
#endif
#ifdef ENETUNREACH
case ENETUNREACH:
#endif
break;
default:
ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
"accept: (client socket)");
clean_child_exit(1);
}

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