.TH INTRO 9
.SH NAME
intro \- introduction to kernel functions
.SH DESCRIPTION
This section of the manual
describes the functions publicly available to the authors of
kernel code, particularly device drivers (real and virtual).
This section will eventually be much expanded, but this makes a start.
.PP
The
.SM SYNOPSIS
subsections do not show the header files needed for
the standard kernel declarations.
The primary combinations summarised below:
.IP
.RS
.ta \w'\fL#include 'u
.nf
.B
#include	"u.h"
.B
#include	"../port/lib.h"
.B
#include	"mem.h"
.B
#include	"dat.h"
.B
#include	"fns.h"
.B
#include	"../port/error.h"
.PP
.I "furthermore, added in IP code:"
.br
.B
#include "../ip/ip.h"
.PP
.I "furthermore, in hardware device drivers:"
.br
.B
#include "io.h"
.br
.B
#include "ureg.h"
.PP
.I "furthermore, in network interfaces or ether drivers:"
.B
#include "../port/netif.h"
.fi
.RE
.PP
There might also be specific include files needed by
drivers on particular platforms or to use specialised kernel interfaces.
The easiest method is to check the source of likely-looking drivers nearby.