NAME

DEV_MODULE — device driver module declaration macro

SYNOPSIS

#include < sys/param.h>
#include < sys/kernel.h>
#include < sys/module.h>
#include < sys/conf.h>

DEV_MODULE( name, modeventhand_t evh, void *arg);

DESCRIPTION

The DEV_MODULE() macro declares a device driver kernel module. It fills in a moduledata_t structure and then calls DECLARE_MODULE() with the correct args, where name is the name of the module and evh (with its argument arg) is the event handler for the module (refer to DECLARE_MODULE(9) for more information). The event handler is supposed to create the device with make_dev() on load and to destroy it when it is unloaded using destroy_dev().

EXAMPLES

#include <sys/module.h> 
#include <sys/conf.h> 
 
static struct cdevsw foo_devsw = { ... }; 
 
static struct cdev *sdev; 
 
static int 
foo_load(module_t mod, int cmd, void *arg) 
{ 
    int err = 0; 
 
    switch (cmd) { 
    case MOD_LOAD: 
        sdev = make_dev(&foo_devsw, 0, UID_ROOT, GID_WHEEL, 0600, "foo"); 
        break;          /* Success*/ 
 
    case MOD_UNLOAD: 
    case MOD_SHUTDOWN: 
        destroy_dev(sdev); 
        break;          /* Success*/ 
 
    default: 
        err = EINVAL; 
        break; 
    } 
 
    return(err); 
} 
 
DEV_MODULE(foo, foo_load, NULL);

SEE ALSO

DECLARE_MODULE(9), destroy_dev(9), make_dev(9), module(9)

AUTHORS

This manual page was written by Alexander Langer <alex@FreeBSD.org>.