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Diffstat (limited to 'share/examples/kld/cdev/module/cdevmod.c')
| -rw-r--r-- | share/examples/kld/cdev/module/cdevmod.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/share/examples/kld/cdev/module/cdevmod.c b/share/examples/kld/cdev/module/cdevmod.c new file mode 100644 index 000000000000..f21723f132f8 --- /dev/null +++ b/share/examples/kld/cdev/module/cdevmod.c @@ -0,0 +1,139 @@ +/* 08 Nov 1998*/ +/* + * cdevmod.c - a sample kld module implementing a character device driver. + * + * 08 Nov 1998 Rajesh Vaidheeswarran + * + * 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; + + 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"); + sdev = make_dev(&my_devsw, 0, UID_ROOT, GID_WHEEL, 0600, "cdev"); + break; /* Success*/ + + 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); |