Date: Tue, 12 Oct 1999 07:20:47 +0100 From: Brian Somers <brian@Awfulhak.org> To: Christopher Masto <chris@netmonger.net>, freebsd-net@FreeBSD.ORG Cc: Brian Somers <brian@Awfulhak.org>, Ernie Elu <ernie@spooky.eis.net.au> Subject: Re: Modem race with Multilink PPP - what does POSIX say ? Message-ID: <199910120620.HAA00670@hak.lan.Awfulhak.org> In-Reply-To: Your message of "Mon, 11 Oct 1999 20:18:01 EDT." <19991011201800.A11154@netmonger.net>
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> On Mon, Oct 11, 1999 at 01:46:16AM +0100, Brian Somers wrote: > > This is a known problem (well, to me anyway). > > > > Ppp will attempt to bind() a local domain socket when MP is > > established. If bind() fails, it'll try to connect(), otherwise > > it'll try to listen(). If two processes are doing this at the same > > time, one bind() succeeds, but the connect() of the failed process > > happens before the servers listen() and fails :-( > > IDKWITA, but from experimentation, the connect() should block for a > while and succeed shortly after the other process calls listen(). > -- > Christopher Masto Senior Network Monkey NetMonger Communications > chris@netmonger.net info@netmonger.net http://www.netmonger.net > > Free yourself, free your machine, free the daemon -- http://www.freebsd.org/ [.....] All very well, but in ppp(8)s case, this means that I need a new datalink state in between lcp and open so that I can go off and deal with more urgent things.... This is non-trivial and a PITA. It's also pretty cruddy and unreliable IMHO. The real way forward would be to have a different errno coming back from connect() - something like EAGAIN rather ECONREFUSED when the socket is bound but not listening. This would be a double bonus because I'd then be able to identify stale local domain sockets. Anybody know what POSIX says on along these lines ? Cheers. -- Brian <brian@Awfulhak.org> <brian@FreeBSD.org> <http://www.Awfulhak.org>; <brian@OpenBSD.org> Don't _EVER_ lose your sense of humour ! <brian@FreeBSD.org.uk> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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