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DEV_MODULE.9freebsd

BSD mandoc

NAME

DEV_MODULE - device driver module declaration macro

SYNOPSIS

In sys/param.h In sys/kernel.h In sys/module.h In sys/conf.h Fn DEV_MODULE name modeventhand_t evh void *arg

DESCRIPTION

The Fn DEV_MODULE macro declares a device driver kernel module. It fills in a Vt moduledata_t structure and then calls Fn DECLARE_MODULE with the correct args, where Fa name is the name of the module and Fa evh (with its argument Fa arg ) is the event handler for the module (refer to DECLARE_MODULE9 for more information). The event handler is supposed to create the device with Fn make_dev on load and to destroy it when it is unloaded using Fn destroy_dev .

EXAMPLES

 #include <sys/module.h>
 #include <sys/conf.h>
 
 static struct cdevsw foo_devsw = { ... };
 
 static dev_t 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_MODULE9, destroy_dev9, make_dev9, module(9)

AUTHORS

This manual page was written by An Alexander Langer Aq alex@FreeBSD.org .