1 /* 2 * Copyright (c) 2007 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 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 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * $DragonFly: src/sys/platform/vkernel/platform/shutdown.c,v 1.1 2007/07/01 02:51:45 dillon Exp $ 35 */ 36 /* 37 * Install a signal handler for SIGTERM which shuts down the virtual kernel 38 */ 39 40 #include "opt_ddb.h" 41 #include <sys/types.h> 42 #include <sys/systm.h> 43 #include <sys/reboot.h> 44 #include <sys/kernel.h> 45 #include <sys/kthread.h> 46 #include <sys/reboot.h> 47 #include <sys/interrupt.h> 48 #include <sys/bus.h> 49 #include <ddb/ddb.h> 50 51 #include <sys/thread2.h> 52 53 #include <machine/trap.h> 54 #include <machine/md_var.h> 55 #include <machine/segments.h> 56 #include <machine/cpu.h> 57 58 #include <err.h> 59 #include <signal.h> 60 #include <unistd.h> 61 62 static void shutdownsig(int signo); 63 static void shutdown_intr(void *arg __unused, void *frame __unused); 64 65 static 66 void 67 initshutdown(void *arg __unused) 68 { 69 struct sigaction sa; 70 71 bzero(&sa, sizeof(sa)); 72 sigemptyset(&sa.sa_mask); 73 sa.sa_flags |= SA_NODEFER; 74 sa.sa_handler = shutdownsig; 75 sigaction(SIGTERM, &sa, NULL); 76 77 register_int(2, shutdown_intr, NULL, "shutdown", NULL, INTR_MPSAFE); 78 } 79 80 static 81 void 82 shutdownsig(int signo) 83 { 84 signalintr(2); 85 } 86 87 SYSINIT(initshutdown, SI_BOOT2_PROC0, SI_ORDER_ANY, 88 initshutdown, NULL); 89 90 /* 91 * DragonFly-safe interrupt thread. We are the only handler on interrupt 92 * #2 so we can just steal the thread's context forever. 93 */ 94 static 95 void 96 shutdown_intr(void *arg __unused, void *frame __unused) 97 { 98 kprintf("Caught SIGTERM from host system. Shutting down...\n"); 99 if (initproc != NULL) { 100 ksignal(initproc, SIGUSR2); 101 } else { 102 reboot(RB_POWEROFF); 103 } 104 } 105