freebsd-dev/share/man/man9/module.9

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.Dd March 1, 2001
.Dt MODULE 9
.Os
.Sh NAME
.Nm module
.Nd structure describing a kernel module
.Sh DESCRIPTION
Each module in the kernel is described by a
.Vt module_t
structure.
The structure contains the name of the device, a unique ID number,
a pointer to an event handler function and to an argument,
which is given to the event handler,
as well as some kernel internal data.
.Pp
The
.Xr DECLARE_MODULE 9
macro
registers the module with the system.
When the module is loaded, the event handler function is called with
the
.Fa what
argument set to
.Dv MOD_LOAD .
On unload,
.Fa what
is set to
.Dv MOD_UNLOAD .
When the system is shutting down,
.Fa what
contains the value of
.Dv MOD_SHUTDOWN .
.Sh EXAMPLES
.Bd -literal
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/module.h>
static int foo_handler(module_t mod, int /*modeventtype_t*/ what,
void *arg);
static moduledata_t mod_data= {
"foo",
foo_handler,
0
};
MODULE_VERSION(foo, 1);
MODULE_DEPEND(foo, bar, 1, 3, 4);
DECLARE_MODULE(foo, mod_data, SI_SUB_EXEC, SI_ORDER_ANY);
.Ed
.Sh SEE ALSO
.Xr DECLARE_MODULE 9 ,
.Xr DEV_MODULE 9 ,
.Xr DRIVER_MODULE 9 ,
.Xr MODULE_DEPEND 9 ,
.Xr MODULE_VERSION 9 ,
.Xr SYSCALL_MODULE 9
.Pp
.Pa /usr/share/examples/kld
.Sh AUTHORS
This man page was written by
.An Alexander Langer Aq alex@FreeBSD.org .