1 /* 2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "runtime/arguments.hpp" 27 #include "runtime/os.hpp" 28 #include "runtime/thread.hpp" 29 #include "utilities/vmError.hpp" 30 31 #include <sys/types.h> 32 #include <sys/wait.h> 33 #include <sys/syscall.h> 34 #include <unistd.h> 35 #include <signal.h> 36 37 void VMError::show_message_box(char *buf, int buflen) { 38 bool yes; 39 do { 40 error_string(buf, buflen); 41 int len = (int)strlen(buf); 42 char *p = &buf[len]; 43 44 jio_snprintf(p, buflen - len, 45 "\n\n" 46 "Do you want to debug the problem?\n\n" 47 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n" 48 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n" 49 "Otherwise, press RETURN to abort...", 50 os::current_process_id(), os::current_process_id(), 51 os::current_thread_id(), os::current_thread_id()); 52 53 yes = os::message_box("Unexpected Error", buf); 54 55 if (yes) { 56 // yes, user asked VM to launch debugger 57 jio_snprintf(buf, buflen, "gdb /proc/%d/exe %d", 58 os::current_process_id(), os::current_process_id()); 59 60 os::fork_and_exec(buf); 61 yes = false; 62 } 63 } while (yes); 64 } 65 66 // Space for our "saved" signal flags and handlers 67 static int resettedSigflags[2]; 68 static address resettedSighandler[2]; 69 70 static void save_signal(int idx, int sig) 71 { 72 struct sigaction sa; 73 sigaction(sig, NULL, &sa); 74 resettedSigflags[idx] = sa.sa_flags; 75 resettedSighandler[idx] = (sa.sa_flags & SA_SIGINFO) 76 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 77 : CAST_FROM_FN_PTR(address, sa.sa_handler); 78 } 79 80 int VMError::get_resetted_sigflags(int sig) { 81 if(SIGSEGV == sig) { 82 return resettedSigflags[0]; 83 } else if(SIGBUS == sig) { 84 return resettedSigflags[1]; 85 } 86 return -1; 87 } 88 89 address VMError::get_resetted_sighandler(int sig) { 90 if(SIGSEGV == sig) { 91 return resettedSighandler[0]; 92 } else if(SIGBUS == sig) { 93 return resettedSighandler[1]; 94 } 95 return NULL; 96 } 97 98 static void crash_handler(int sig, siginfo_t* info, void* ucVoid) { 99 // unmask current signal 100 sigset_t newset; 101 sigemptyset(&newset); 102 sigaddset(&newset, sig); 103 sigprocmask(SIG_UNBLOCK, &newset, NULL); 104 105 VMError err(NULL, sig, NULL, info, ucVoid); 106 err.report_and_die(); 107 } 108 109 void VMError::reset_signal_handlers() { 110 // Save sigflags for resetted signals 111 save_signal(0, SIGSEGV); 112 save_signal(1, SIGBUS); 113 os::signal(SIGSEGV, CAST_FROM_FN_PTR(void *, crash_handler)); 114 os::signal(SIGBUS, CAST_FROM_FN_PTR(void *, crash_handler)); 115 }