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Using fcntl from NKE

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Using fcntl from NKE

Subject: Using fcntl from NKE
From: Mick Ring <email@hidden>
Date: Thu, 17 May 2007 12:10:05 -0700

I'm developing an NKE that hooks socket operations via kpi_socketfilter APIs. I need to be able to associate an incoming socket_t with the pid of the process that created it. I've attempted to use fcntl for this purpose, but my kext won't load because "_fcntl" is an undefined symbol. My plist includes the following OSBundleLibraries:

com.apple.kernel.bsd
com.apple.kernel.mach
com.apple.kpi.bsd
com.apple.kpi.iokit
com.apple.kpi.libkern
com.apple.kpi.mach

According to Apple documentation, I only need com.apple.kernel.bsd and com.apple.kernel.mach in order to use the headers in /sys, which is where you'll find fcntl.h.

Does the fact that fcntl is undefined mean that I can't use it in my kext? If I can't use it, is there another mechanism for getting the pid from a socket_t?

Mitchell J Laurren-Ring
Critical Path Software
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