Using userland library in Kernel

Biks N at
Fri Aug 10 12:14:39 PDT 2007

Thanks to everyone :)

On 8/8/07, Craig Boston <cb at> wrote:
> On Wed, Aug 08, 2007 at 11:23:25AM -0500, Biks N wrote:
> > I am new to FreeBSD kernel programming and I am trying to use userland
> > library (zlib) in FreeBSD kernel. But I am not sure if zlib library is
> > linkable from the kernel.
> Normally, no, you can't just link in a library designed for userland
> into the kernel.  Some porting is required to deal with the kernel
> environment -- things such as not having a full C library available,
> different memory management, etc.
> In this case however, there is already a zlib implementation in the
> kernel.  IIRC, geom_uzip and the crypto framework both use it.
> You may want to check out sys/net/zlib.[ch] and see if it can do what
> you're after.  You'll need to make sure to include a dependency on the
> zlib module and/or add it to your kernel configuration.
> Good luck,
> Craig

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