.\"
.\" Copyright (c) 2005,2008
.\"	Hartmut Brandt.
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.\" Author: Hartmut Brandt <harti@FreeBSD.org>
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.Dd January 8, 2008
.Dt BSD.SNMPMOD.MK 7
.Os
.Sh NAME
.Nm bsd.snmpmod.mk
.Nd building modules for
.Xr bsnmpd 1
.Sh SYNOPSIS
.Fd ".include <bsd.snmpmod.mk>"
.Sh DESCRIPTION
The file
.In bsd.snmpmod.mk
simplifies the building of modules for the Begemot SNMP daemon,
.Xr bsnmpd 1 .
It provides some common functions for building a module and
relies on
.In bsd.lib.mk ,
which is included by
.In bsd.snmpmod.mk
to actually build the shared library.
.Pp
The following
.Xr make 1
variables control the special functions:
.Bl -tag -width ".Va EXTRAMIBDEFS"
.It Va MOD
The short name of the module.
The name of the shared library will be
.Pa snmp_${MOD}.so .
There must exist a file
.Pa ${MOD}_tree.def
for compilation with
.Xr gensnmptree 1
which contains the definition of the MIB tree implemented by the module.
.It Va EXTRAMIBDEFS
A list of extra MIB definition files for
.Xr gensnmptree 1 .
This is optional.
This file list is given to both calls to
.Xr gensnmptree 1 No \(em
the one that extracts the symbols in
.Va XSYM
from the MIB definitions and the one that
generates the table with OIDs served by this module.
.It Va EXTRAMIBSYMS
A list of extra MIB definition files for
.Xr gensnmptree 1 .
This is optional.
This file list is given only to the call to
.Xr gensnmptree 1
that extracts symbols from MIB definition files.
It is useful if there are dependencies on other MIBs or for extracting global
definitions for enumeration constants.
.It Va XSYM
A list of symbols to be extracted from the MIB definition files by
.Xr gensnmptree 1 .
This is optional.
.It Va DEFS
A list of MIB definition files to be installed.
This is optional.
.It Va BMIBS
A list of textual MIBs to be installed.
This is optional.
.El
.Pp
Three files are automatically created from the MIB definition files and
the
.Va XSYM
variable:
.Bl -tag -width ".Va EXTRAMIBDEFS"
.It Pa ${MOD}_tree.c
This contains a table with the tree implemented by the module.
It is automatically included into the
.Va SRCS
variable.
.It Pa ${MOD}_tree.h
This contains preprocessor defines for all the OIDs defined by the module
and can be included in the module's source code.
.It Pa ${MOD}_oid.h
OID preprocessor definitions for all the symbols listed in
.Va XSYMS .
This is to be included into the module's source code.
.El
.Sh SEE ALSO
.Xr bsnmpd 1 ,
.Xr gensnmptree 1 ,
.Xr snmpmod 3