mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-26 11:47:31 +00:00
122 lines
3.4 KiB
Groff
122 lines
3.4 KiB
Groff
.\" -*- nroff -*-
|
|
.\"
|
|
.\" Copyright (c) 2000 Alexander Langer
|
|
.\"
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This program is free software.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
|
|
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.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.
|
|
.Pp
|
|
When the module is loaded, the event handler function is called with
|
|
the
|
|
.Fa what
|
|
argument set to
|
|
.Dv MOD_LOAD .
|
|
.Pp
|
|
On unload it is first called with
|
|
.Fa what
|
|
set to
|
|
.Dv MOD_QUIESCE .
|
|
If the unload was not forced, a non-zero return will prevent the
|
|
unload from happening.
|
|
.Pp
|
|
If the unload continues
|
|
.Fa what
|
|
is set to
|
|
.Dv MOD_UNLOAD .
|
|
If the module returns non-zero to this, the unload will not happen.
|
|
.Pp
|
|
The difference between
|
|
.Dv MOD_QUIESCE
|
|
and
|
|
.Dv MOD_UNLOAD
|
|
is that the module should fail
|
|
.Dv MOD_QUIESCE
|
|
if it is currently in use, whereas
|
|
.Dv MOD_UNLOAD
|
|
should only fail if it is impossible to unload the module, for instance
|
|
because there are memory references to the module which cannot be revoked.
|
|
.Pp
|
|
When the system is shutting down,
|
|
.Fa what
|
|
contains the value of
|
|
.Dv MOD_SHUTDOWN .
|
|
.Pp
|
|
The module should return
|
|
.Er EOPNOTSUPP
|
|
for unrecognized values of
|
|
.Fa what .
|
|
.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 manual page was written by
|
|
.An Alexander Langer Aq alex@FreeBSD.org .
|