Re: select for UNIX sockets?

From: Krzysztof Halasa (
Date: Mon Jun 09 2003 - 12:18:14 EST

"David Schwartz" <> writes:

> It really doesn't matter. UDP applications have to control the transmit
> pacing at application level. There is absolutely no way for the kernel to
> know whether the path to the recipient is congested or not.

Because what? The kernel knows everything it has to know - i.e. complete
state of socket queue in question.

But if select() on sockets is illegal, should we make it return -Esth
instead of success. Certainly, we should get rid of invalid kernel code,

> The kernel can't tell you when to send because that depends upon
> factors
> that are remote.

Such as?

> Yes, it would be nice of the kernel helped more. But the application
> has to
> deal with remote packet loss as well.

Could you please show me a place in the kernel which could cause such
a loss on local datagram sockets?

Krzysztof Halasa
Network Administrator
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