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DEV_MODULE(9) Kernel Developer's Manual DEV_MODULE(9)

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>.
January 19, 2012 Linux 4.19.0-10-amd64