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 /* 35 * Install a signal handler for SIGTERM which shuts down the virtual kernel 36 */ 37 38 #include <sys/types.h> 39 #include <sys/systm.h> 40 #include <sys/reboot.h> 41 #include <sys/kernel.h> 42 #include <sys/kthread.h> 43 #include <sys/reboot.h> 44 #include <sys/interrupt.h> 45 #include <sys/bus.h> 46 #include <ddb/ddb.h> 47 48 #include <sys/thread2.h> 49 50 #include <machine/trap.h> 51 #include <machine/md_var.h> 52 #include <machine/segments.h> 53 #include <machine/cpu.h> 54 55 #include <err.h> 56 #include <signal.h> 57 #include <unistd.h> 58 59 static void shutdownsig(int signo); 60 static void shutdown_intr(void *arg __unused, void *frame __unused); 61 62 static 63 void 64 initshutdown(void *arg __unused) 65 { 66 struct sigaction sa; 67 68 bzero(&sa, sizeof(sa)); 69 sigemptyset(&sa.sa_mask); 70 sa.sa_flags |= SA_NODEFER; 71 sa.sa_handler = shutdownsig; 72 sigaction(SIGTERM, &sa, NULL); 73 74 register_int_virtual(2, shutdown_intr, NULL, "shutdown", NULL, 75 INTR_MPSAFE); 76 } 77 78 static 79 void 80 shutdownsig(int signo) 81 { 82 signalintr(2); 83 } 84 85 SYSINIT(initshutdown, SI_BOOT2_PROC0, SI_ORDER_ANY, 86 initshutdown, NULL); 87 88 /* 89 * DragonFly-safe interrupt thread. We are the only handler on interrupt 90 * #2 so we can just steal the thread's context forever. 91 */ 92 static 93 void 94 shutdown_intr(void *arg __unused, void *frame __unused) 95 { 96 kprintf("Caught SIGTERM from host system. Shutting down...\n"); 97 if (initproc != NULL) { 98 ksignal(initproc, SIGUSR2); 99 } else { 100 reboot(RB_POWEROFF); 101 } 102 } 103