[Dovecot] fcntl Bad file descriptor

[Timo Sirainen]

On Thu, 2006-08-10 at 23:40 -0400, Bill Boebel wrote:
> I've seen a couple of these in the log while testing the proxy too.  Do you know what would cause this?
> 
> Aug 10 23:30:29 director5 dovecot: imap-login: fcntl(-1, F_GETFL) failed: Bad file descriptor
> Aug 10 23:30:29 director5 dovecot: imap-login: fd_set_nonblock(-1) failed: Bad file descriptor
> Aug 10 23:30:29 director5 dovecot: child 14016 (login) returned error 89

I couldn't figure out why this could ever happen, but I added some extra
asserts now to the code.

Well, the only reason besides memory corruption that I can think of is
this:

	if (socketpair(AF_UNIX, SOCK_STREAM, 0, sfd) < 0) {
		i_error("socketpair() failed: %m");
		SSL_free(ssl);
		return -1;
	}

	net_set_nonblock(sfd[0], TRUE);
	net_set_nonblock(sfd[1], TRUE);

If socketpair() for some reason didn't return -1, but the sfd[] contains
-1 fds, then it could happen. But that'd mean there's a bug in
kernel/libc..
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