netdev - tcp write returns 0?

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Message-ID: <007901c903c1$044b8780$0ce29680$@com>
Date:	Thu, 21 Aug 2008 12:06:28 -0700
From:	"Hua Zhong" <hzhong@...il.com>
To:	<netdev@...r.kernel.org>
Subject: tcp write returns 0?

Hi,

Under what condition would tcp write return 0?

Especially since a previous poll() indicates the socket is writable. Could
this only happen for socket in NONBLOCK mode?

Thanks.

Hua

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