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Date: Tue, 31 Aug 2004 14:44:54 +0100
From: Mike Bristow <mike@urgle.com>
To: Brian O'Shea <b_oshea@yahoo.com>
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cc: FreeBSD_Hackers <freebsd-hackers@freebsd.org>
Subject: Re: Library (ab)use in kernel land
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On Sat, Aug 28, 2004 at 01:40:50PM -0700, Brian O'Shea wrote:
> That being said, there are a few analogs of the standard C
> library functions in the kernel, such as printf, strcpy, bcmp,
> qsort, etc.  You can find sources for them in src/sys/libkern/
> with prototypes in the src/sys/sys/libkern.h and src/sys/sys/systm.h
> header files.

And manual pages in section 9 of the manual, eg:

$ man 9 printf

will give you the docs for the printf that you can call in kernelspace.