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.TH CONFIG 5
.SH NAME
config \- system configuration template files
.SH DESCRIPTION
These files are used as input by
.IR config (8).
Except as noted,
they are kept in
.IR /usr/sys/conf .
.PP
.I Files
names the source files
that make up the kernel.
Each line consists of a filename
(relative to
.IR /usr/sys )
followed by some magic words.
For example:
.IP
sys/acct.c	standard
.PP
is a file used by any version of the system;
.IP
dev/uba.c	standard device-driver
.PP
is also always used,
and contains device register references
(which may require special compilation hacks);
.IP
dev/ju.c	optional ju device-driver
.PP
is included only if the
.I ju
device is expected;
.IP
dev/ttyld.c	optional tty pseudo-device
.PP
is included only if the
.I tty
pseudo-device is requested.
.PP
.I Devices
describes possible device drivers,
file system handlers,
and line disciplines;
the information is used to generate
handler dispatch tables.
It consists of lines with the following blank-separated fields:
.IP
Type of handler:
.I device
for character devices,
.I stream-device
for character stream devices,
.I block-device
for block devices,
.I file-system
for file system handlers,
.I line-discipline
for line discipline handlers.
If the type is preceded by the word `standard'
.RI ( e.g.
.IR "standard block-device" ),
the handler is always included;
otherwise,
it is included only if requested.
.IP
Table index:
major device number,
filesystem type,
or line discipline number.
.IP
Driver name.
Used in
.IR files 
and
.IR conf .
.I Config
writes a header file
.I name.h
for each device;
if that device
is configured,
NAME
is defined to be
the number of devices
of that type.
.IP
Entry point name.
Used as a prefix for data structure
and driver entry points.
.IP
Entry points.
For block devices,
some of
.IR open ,
.IR close ,
.IR strategy ,
.IR dump ,
.IR B_TAPE
(the last puts the flag
.I B_TAPE
in the
.I d_flags
entry in the block device switch);
for character devices,
.IR open ,
.IR close ,
.IR read ,
.IR write ,
.IR ioctl ,
.IR reset .
For stream devices
and line disciplines,
.I info
should be specified.
For file system handlers,
.IR put ,
.IR get ,
.IR free ,
.IR updat ,
.IR read ,
.IR write ,
.IR trunc ,
.IR stat ,
.IR nami ,
.IR mount ,
.IR ioctl .
.PP
As a special case,
lines beginning with
.RB ` : '
are copied intact to
.IR conf.c .
This can be used for hacks like
.IP
: int mem_no = 3;	/* major device number of memory special file */
.PP
Addenda to
.I files
and
.I devices
specific to a particular machine
may be kept in
.IR /usr/sys/ machine /files
and
.IR /usr/sys/ machine /devices .
The addenda are treated as if appended to the
general files.

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