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cdevmod.c
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Editing: cdevmod.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);
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