Re: missing mbuf_len at load time

Subject: Re: missing mbuf_len at load time

From: Rick Altherr <email@hidden>

Date: Fri, 22 Feb 2008 14:52:33 -0800

Delivered-to: email@hidden

On Feb 22, 2008, at 2:46 PM, Chris Neustrup wrote:

I'm building an ethernet controller device driver that needs to implement outputPacket(), overloaded from IONetworkController. In order to manipulate the packet pointed to by mbuf_t *, I've invoked mbuf_len to check the length of the data. xcode can find the declaration in kpi_mbuf.h, but the linker can't find it at kext load time. I'm running 10.4.10, which has worked fine until now. By the message, the linker is expecting c++ linkage: __Z8mbuf_lenP6__mbuf

Thanks in advance, Chris

snippet...

UInt32
xgg::outputPacket( mbuf_t packet, void * param )
{
size_t mlen = mbuf_len(packet);
IOLog("xgg::outputPacket mbuf data len %d\n", mlen);

return kIOReturnSuccess;
}

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It looks like kpi_mbuf.h doesn't guard itself when included in C++ code. Change your #include to look like:

extern "C" {

#include <sys/kpi_mbuf.h>

}

and you should be golden.

Rick Altherr

Architecture and Performance Group

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References:

>missing mbuf_len at load time (From: Chris Neustrup <email@hidden>)