1.\" -*- nroff -*- 2.\" 3.\" Copyright (c) 2001 Alexander Langer 4.\" 5.\" All rights reserved. 6.\" 7.\" This program is free software. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 19.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 22.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28.\" 29.\" $FreeBSD$ 30.\" 31.Dd January 19, 2012 32.Dt DEV_MODULE 9 33.Os 34.Sh NAME 35.Nm DEV_MODULE 36.Nd device driver module declaration macro 37.Sh SYNOPSIS 38.In sys/param.h 39.In sys/kernel.h 40.In sys/module.h 41.In sys/conf.h 42.Fn DEV_MODULE "name" "modeventhand_t evh" "void *arg" 43.Sh DESCRIPTION 44The 45.Fn DEV_MODULE 46macro declares a device driver kernel module. 47It fills in a 48.Vt moduledata_t 49structure and then calls 50.Fn DECLARE_MODULE 51with the correct args, where 52.Fa name 53is the name of the module and 54.Fa evh 55(with its argument 56.Fa arg ) 57is the event handler for the module (refer to 58.Xr DECLARE_MODULE 9 59for more information). 60The event handler is supposed to create the device with 61.Fn make_dev 62on load and to destroy it when it is unloaded using 63.Fn destroy_dev . 64.Sh EXAMPLES 65.Bd -literal 66#include <sys/module.h> 67#include <sys/conf.h> 68 69static struct cdevsw foo_devsw = { ... }; 70 71static struct cdev *sdev; 72 73static int 74foo_load(module_t mod, int cmd, void *arg) 75{ 76 int err = 0; 77 78 switch (cmd) { 79 case MOD_LOAD: 80 sdev = make_dev(&foo_devsw, 0, UID_ROOT, GID_WHEEL, 0600, "foo"); 81 break; /* Success*/ 82 83 case MOD_UNLOAD: 84 case MOD_SHUTDOWN: 85 destroy_dev(sdev); 86 break; /* Success*/ 87 88 default: 89 err = EINVAL; 90 break; 91 } 92 93 return(err); 94} 95 96DEV_MODULE(foo, foo_load, NULL); 97.Ed 98.Sh SEE ALSO 99.Xr DECLARE_MODULE 9 , 100.Xr destroy_dev 9 , 101.Xr make_dev 9 , 102.Xr module 9 103.Sh AUTHORS 104This manual page was written by 105.An Alexander Langer Aq Mt alex@FreeBSD.org . 106