Date: Wed, 30 Apr 2008 18:00:43 +0200 From: Pieter de Boer <pieter@thedarkside.nl> To: freebsd-emulation@freebsd.org Subject: Linux compat ioctl return values Message-ID: <481897AB.7070003@thedarkside.nl>
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Hi, I've been working on a kernel driver that creates a device. This device in turn is opened and ioctl'd from a Linux executable. I've registered a handler for these ioctl's and my ioctl handler is succesfully executed. My ioctl-handler returns a large positive value, but the userland application retrieves the value 1, EPERM. If I return 42, the userland application retrieves 42, but 260 is retrieved as 1. It appears there's a threshold somewhere above which the return value is set to 1, but I haven't been able to find out where in the code this is done. The Linux executable actually expects the value I return, and doesn't work when EPERM is found instead. So, the question is: does anyone know where such a threshold may reside and how to work around it? Thanks, Pieter
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