1 /* 2 * Copyright (c) 2003, 2013, 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 <unistd.h> 34 #include <signal.h> 35 36 void VMError::show_message_box(char *buf, int buflen) { 37 bool yes; 38 do { 39 error_string(buf, buflen); 40 int len = (int)strlen(buf); 41 char *p = &buf[len]; 42 43 jio_snprintf(p, buflen - len, 44 "\n\n" 45 "Do you want to debug the problem?\n\n" 46 "To debug, run 'dbx -a %d'; then switch to thread tid " INTX_FORMAT ", k-tid " INTX_FORMAT "\n" 47 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 48 "Otherwise, press RETURN to abort...", 49 os::current_process_id(), 50 os::current_thread_id(), thread_self()); 51 52 yes = os::message_box("Unexpected Error", buf); 53 54 if (yes) { 55 // yes, user asked VM to launch debugger 56 jio_snprintf(buf, buflen, "dbx -a %d", os::current_process_id()); 57 58 os::fork_and_exec(buf); 59 yes = false; 60 } 61 } while (yes); 62 } 63 64 // Handle all synchronous signals which may happen during signal handling, 65 // not just SIGSEGV and SIGBUS. 66 static const int SIGNALS[] = { SIGSEGV, SIGBUS, SIGILL, SIGFPE, SIGTRAP }; // add more if needed 67 static const int NUM_SIGNALS = sizeof(SIGNALS) / sizeof(int); 68 69 // Space for our "saved" signal flags and handlers 70 static int resettedSigflags[NUM_SIGNALS]; 71 static address resettedSighandler[NUM_SIGNALS]; 72 73 static void save_signal(int idx, int sig) { 74 struct sigaction sa; 75 sigaction(sig, NULL, &sa); 76 resettedSigflags[idx] = sa.sa_flags; 77 resettedSighandler[idx] = (sa.sa_flags & SA_SIGINFO) 78 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 79 : CAST_FROM_FN_PTR(address, sa.sa_handler); 80 } 81 82 int VMError::get_resetted_sigflags(int sig) { 83 // Handle all program errors. 84 for (int i = 0; i < NUM_SIGNALS; i++) { 85 if (SIGNALS[i] == sig) { 86 return resettedSigflags[i]; 87 } 88 } 89 return -1; 90 } 91 92 address VMError::get_resetted_sighandler(int sig) { 93 // Handle all program errors. 94 for (int i = 0; i < NUM_SIGNALS; i++) { 95 if (SIGNALS[i] == sig) { 96 return resettedSighandler[i]; 97 } 98 } 99 return NULL; 100 } 101 102 static void crash_handler(int sig, siginfo_t* info, void* ucVoid) { 103 // Unmask current signal. 104 sigset_t newset; 105 sigemptyset(&newset); 106 sigaddset(&newset, sig); 107 108 Unimplemented(); 109 } 110 111 void VMError::reset_signal_handlers() { 112 sigset_t newset; 113 sigemptyset(&newset); 114 115 for (int i = 0; i < NUM_SIGNALS; i++) { 116 save_signal(i, SIGNALS[i]); 117 os::signal(SIGNALS[i], CAST_FROM_FN_PTR(void *, crash_handler)); 118 sigaddset(&newset, SIGNALS[i]); 119 } 120 121 sigthreadmask(SIG_UNBLOCK, &newset, NULL); 122 }