Date: Thu, 06 May 2010 20:12:07 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-hackers@freebsd.org Subject: Re: How to get data from kernel module ? Message-ID: <hrv0pd$iqd$1@dough.gmane.org> In-Reply-To: <alpine.DEB.1.10.1005061528380.21095@a04-0215a.kn.vutbr.cz> References: <alpine.DEB.1.10.1005061528380.21095@a04-0215a.kn.vutbr.cz>
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On 05/06/10 15:38, Lukáš Czerner wrote: > Hi, > > I am creating a kernel module and I need to get some information from > that module. I can do this with ioctl and pass the data to the > user space but it seems a bit unpractical to me, because I do not know > the amount of the data - it can differ. I do not know of any way to > pass a list of structures to the userspace through ioctl - is there > any? > > So my question is, is there any standard way in FreeBSD to do this ? > In linux I would probably use the sysfs, but in FreeBSD I can not find > anything similar, except just creating some virtual filesystem on my > own and obviously this is not what I want to do. As others said, sysctl is one way to go, but might not be very convenient if the amount of data is large. I'd rather setup a device and a simple protocol to read/write to/from it. http://www.freebsd.org/doc/en/books/arch-handbook/driverbasics-char.html (you want the 5+ version)
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