1 /* 2 * Copyright (c) 2003, 2006, 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 "incls/_precompiled.incl" 26 # include "incls/_vmError_solaris.cpp.incl" 27 28 #include <sys/types.h> 29 #include <sys/wait.h> 30 #include <signal.h> 31 32 void VMError::show_message_box(char *buf, int buflen) { 33 bool yes; 34 do { 35 error_string(buf, buflen); 36 int len = (int)strlen(buf); 37 char *p = &buf[len]; 38 39 jio_snprintf(p, buflen - len, 40 "\n\n" 41 "Do you want to debug the problem?\n\n" 42 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" 43 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 44 "Otherwise, press RETURN to abort...", 45 os::current_process_id(), os::current_thread_id()); 46 47 yes = os::message_box("Unexpected Error", buf); 48 49 if (yes) { 50 // yes, user asked VM to launch debugger 51 jio_snprintf(buf, buflen, "dbx - %d", os::current_process_id()); 52 53 os::fork_and_exec(buf); 54 yes = false; 55 } 56 } while (yes); 57 } 58 59 // Space for our "saved" signal flags and handlers 60 static int resettedSigflags[2]; 61 static address resettedSighandler[2]; 62 63 static void save_signal(int idx, int sig) 64 { 65 struct sigaction sa; 66 sigaction(sig, NULL, &sa); 67 resettedSigflags[idx] = sa.sa_flags; 68 resettedSighandler[idx] = (sa.sa_flags & SA_SIGINFO) 69 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 70 : CAST_FROM_FN_PTR(address, sa.sa_handler); 71 } 72 73 int VMError::get_resetted_sigflags(int sig) { 74 if(SIGSEGV == sig) { 75 return resettedSigflags[0]; 76 } else if(SIGBUS == sig) { 77 return resettedSigflags[1]; 78 } 79 return -1; 80 } 81 82 address VMError::get_resetted_sighandler(int sig) { 83 if(SIGSEGV == sig) { 84 return resettedSighandler[0]; 85 } else if(SIGBUS == sig) { 86 return resettedSighandler[1]; 87 } 88 return NULL; 89 } 90 91 static void crash_handler(int sig, siginfo_t* info, void* ucVoid) { 92 // unmask current signal 93 sigset_t newset; 94 sigemptyset(&newset); 95 sigaddset(&newset, sig); 96 sigprocmask(SIG_UNBLOCK, &newset, NULL); 97 98 VMError err(NULL, sig, NULL, info, ucVoid); 99 err.report_and_die(); 100 } 101 102 void VMError::reset_signal_handlers() { 103 // Save sigflags for resetted signals 104 save_signal(0, SIGSEGV); 105 save_signal(1, SIGBUS); 106 os::signal(SIGSEGV, CAST_FROM_FN_PTR(void *, crash_handler)); 107 os::signal(SIGBUS, CAST_FROM_FN_PTR(void *, crash_handler)); 108 }