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panic.c revision 1.1 
      1 /* $NetBSD: panic.c,v 1.1 2011/02/18 01:07:20 jmcneill Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2011 Jared D. McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. The name of the author may not be used to endorse or promote products
     13  *    derived from this software without specific prior written permission.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     20  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     21  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     22  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     23  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 __KERNEL_RCSID(0, "$NetBSD: panic.c,v 1.1 2011/02/18 01:07:20 jmcneill Exp $");
     30 
     31 #include <sys/module.h>
     32 
     33 MODULE(MODULE_CLASS_MISC, panic, NULL);
     34 
     35 static void
     36 panic_dopanic(void)
     37 {
     38 	/* just call panic */
     39 	panic("oops");
     40 }
     41 
     42 static void
     43 panic_donullptr(void)
     44 {
     45 	/* null ptr dereference */
     46 	*(int *)NULL = 1;
     47 }
     48 
     49 static const struct {
     50 	const char *name;
     51 	void (*func)(void);
     52 } panic_howto[] = {
     53 	{ "panic",	panic_dopanic },
     54 	{ "nullptr",	panic_donullptr },
     55 };
     56 
     57 static int
     58 panic_modcmd(modcmd_t cmd, void *opaque)
     59 {
     60 	if (cmd == MODULE_CMD_INIT) {
     61 		prop_dictionary_t props = opaque;
     62 		const char *how = NULL;
     63 		unsigned int i;
     64 
     65 		if (props)
     66 			prop_dictionary_get_cstring_nocopy(props, "how", &how);
     67 		if (how == NULL)
     68 			how = "panic";
     69 
     70 		for (i = 0; i < __arraycount(panic_howto); i++) {
     71 			if (strcmp(how, panic_howto[i].name) == 0) {
     72 				panic_howto[i].func();
     73 				break;
     74 			}
     75 		}
     76 		if (i == __arraycount(panic_howto))
     77 			printf("%s: no how '%s'\n", __func__, how);
     78 		else
     79 			printf("%s: how '%s' didn't panic?\n", __func__, how);
     80 
     81 		return EINVAL;
     82 	}
     83 
     84 	return ENOTTY;
     85 }
     86