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Manual Pages  — DEV_MODULE


DEV_MODULE – device driver module declaration macro



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

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


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().


#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);


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


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

DEV_MODULE (9) January 19, 2012

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