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106 lines
2.8 KiB
Groff
106 lines
2.8 KiB
Groff
.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 2001 Alexander Langer
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.\"
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.\" All rights reserved.
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.\"
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.\" This program is free software.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd March 11, 2001
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.Dt DEV_MODULE 9
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.Os
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.Sh NAME
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.Nm DEV_MODULE
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.Nd device driver module declaration macro
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/kernel.h
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.In sys/module.h
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.In sys/conf.h
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.Fn DEV_MODULE "name" "modeventhand_t evh" "void *arg"
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.Sh DESCRIPTION
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The
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.Fn DEV_MODULE
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macro declares a device driver kernel module.
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It fills in a
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.Vt moduledata_t
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structure and then calls
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.Fn DECLARE_MODULE
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with the correct args, where
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.Fa name
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is the name of the module and
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.Fa evh
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(with its argument
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.Fa arg )
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is the event handler for the module (refer to
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.Xr DECLARE_MODULE 9
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for more information).
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The event handler is supposed to create the device with
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.Fn make_dev
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on load and to destroy it when it is unloaded using
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.Fn destroy_dev .
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.Sh EXAMPLES
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.Bd -literal
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#include <sys/module.h>
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#include <sys/conf.h>
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static struct cdevsw foo_devsw = { ... };
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static dev_t sdev;
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static int
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foo_load(module_t mod, int cmd, void *arg)
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{
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int err = 0;
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switch (cmd) {
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case MOD_LOAD:
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sdev = make_dev(&foo_devsw, 0, UID_ROOT, GID_WHEEL, 0600, "foo");
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break; /* Success*/
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case MOD_UNLOAD:
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case MOD_SHUTDOWN:
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destroy_dev(sdev);
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break; /* Success*/
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default:
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err = EINVAL;
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break;
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}
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return(err);
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}
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DEV_MODULE(foo, foo_load, NULL);
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.Ed
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.Sh SEE ALSO
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.Xr DECLARE_MODULE 9 ,
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.Xr destroy_dev 9 ,
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.Xr make_dev 9 ,
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.Xr module 9
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.Sh AUTHORS
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This manual page was written by
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.An Alexander Langer Aq alex@FreeBSD.org .
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