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sock_sendmbuf fail with EMSGSIZE (40)

Subject: sock_sendmbuf fail with EMSGSIZE (40)
From: John Huan <email@hidden>
Date: Wed, 27 Aug 2008 08:50:11 +1000
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Hi, All,

Currently, I am writing a kernel driver using kpi_socket to build a pipe sending audio samples back to user space. (In kernel side, it is a pipe client instead of listener) For most of the times, packages can be successfully sent to user space without problem. But, sometimes, it fails with errno 40 (EMSGSIZE). And as soon as it starts failing with that error, the following sending will all fail with that error, no matter how big is the package (even those very small packages with only 8 bytes). I have been searching over the Internet for quite a while and haven't find the answer yet.

Does anyone know this?

Thanks a lot!
John H.

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