6058f7207a
Make use of make_dev_s in the example cdev. While here, fix warnings. Reviewed by: rpokala
149 lines
5.4 KiB
C
149 lines
5.4 KiB
C
/* 08 Nov 1998*/
|
|
/*-
|
|
* cdevmod.c - a sample kld module implementing a character device driver.
|
|
*
|
|
* 08 Nov 1998 Rajesh Vaidheeswarran
|
|
*
|
|
* SPDX-License-Identifier: BSD-4-Clause
|
|
*
|
|
* Copyright (c) 1998 Rajesh Vaidheeswarran
|
|
* All rights reserved.
|
|
*
|
|
* 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Rajesh Vaidheeswarran.
|
|
* 4. The name Rajesh Vaidheeswarran may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY RAJESH VAIDHEESWARRAN ``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 RAJESH VAIDHEESWARRAN 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.
|
|
*
|
|
* Copyright (c) 1993 Terrence R. Lambert.
|
|
* All rights reserved.
|
|
*
|
|
* 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Terrence R. Lambert.
|
|
* 4. The name Terrence R. Lambert may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``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 TERRENCE R. LAMBERT 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.
|
|
*
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/module.h>
|
|
#include <sys/conf.h>
|
|
|
|
#include "cdev.h"
|
|
|
|
static struct cdevsw my_devsw = {
|
|
/* version */ .d_version = D_VERSION,
|
|
/* open */ .d_open = mydev_open,
|
|
/* close */ .d_close = mydev_close,
|
|
/* read */ .d_read = mydev_read,
|
|
/* write */ .d_write = mydev_write,
|
|
/* ioctl */ .d_ioctl = mydev_ioctl,
|
|
/* name */ .d_name = "cdev"
|
|
};
|
|
|
|
/*
|
|
* Used as the variable that is the reference to our device
|
|
* in devfs... we must keep this variable sane until we
|
|
* call kldunload.
|
|
*/
|
|
static struct cdev *sdev;
|
|
|
|
/*
|
|
* This function is called each time the module is loaded or unloaded.
|
|
* Since we are a miscellaneous module, we have to provide whatever
|
|
* code is necessary to patch ourselves into the area we are being
|
|
* loaded to change.
|
|
*
|
|
* The stat information is basically common to all modules, so there
|
|
* is no real issue involved with stat; we will leave it lkm_nullcmd(),
|
|
* since we don't have to do anything about it.
|
|
*/
|
|
|
|
static int
|
|
cdev_load(module_t mod, int cmd, void *arg)
|
|
{
|
|
int err = 0;
|
|
struct make_dev_args mda;
|
|
|
|
switch (cmd) {
|
|
case MOD_LOAD:
|
|
|
|
/* Do any initialization that you should do with the kernel */
|
|
|
|
/* if we make it to here, print copyright on console*/
|
|
printf("\nSample Loaded kld character device driver\n");
|
|
printf("Copyright (c) 1998\n");
|
|
printf("Rajesh Vaidheeswarran\n");
|
|
printf("All rights reserved\n");
|
|
|
|
make_dev_args_init(&mda);
|
|
mda.mda_devsw = &my_devsw;
|
|
mda.mda_uid = UID_ROOT;
|
|
mda.mda_gid = GID_WHEEL;
|
|
mda.mda_mode = 0600;
|
|
err = make_dev_s(&mda, &sdev, "cdev");
|
|
break;
|
|
|
|
case MOD_UNLOAD:
|
|
printf("Unloaded kld character device driver\n");
|
|
destroy_dev(sdev);
|
|
break; /* Success*/
|
|
|
|
default: /* we only understand load/unload*/
|
|
err = EOPNOTSUPP;
|
|
break;
|
|
}
|
|
|
|
return(err);
|
|
}
|
|
|
|
/* Now declare the module to the system */
|
|
|
|
DEV_MODULE(cdev, cdev_load, NULL);
|