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https://github.com/openjdk/jdk.git
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127 lines
4 KiB
C++
127 lines
4 KiB
C++
/*
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* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "runtime/arguments.hpp"
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#include "runtime/os.hpp"
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#include "runtime/thread.hpp"
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#include "utilities/vmError.hpp"
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <thread.h>
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#include <signal.h>
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void VMError::show_message_box(char *buf, int buflen) {
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bool yes;
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do {
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error_string(buf, buflen);
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int len = (int)strlen(buf);
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char *p = &buf[len];
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jio_snprintf(p, buflen - len,
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"\n\n"
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"Do you want to debug the problem?\n\n"
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"To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n"
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"Enter 'yes' to launch dbx automatically (PATH must include dbx)\n"
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"Otherwise, press RETURN to abort...",
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os::current_process_id(), os::current_thread_id());
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yes = os::message_box("Unexpected Error", buf);
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if (yes) {
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// yes, user asked VM to launch debugger
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jio_snprintf(buf, buflen, "dbx - %d", os::current_process_id());
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os::fork_and_exec(buf);
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yes = false;
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}
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} while (yes);
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}
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// handle all synchronous program error signals which may happen during error
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// reporting. They must be unblocked, caught, handled.
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static const int SIGNALS[] = { SIGSEGV, SIGBUS, SIGILL, SIGFPE, SIGTRAP }; // add more if needed
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static const int NUM_SIGNALS = sizeof(SIGNALS) / sizeof(int);
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// Space for our "saved" signal flags and handlers
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static int resettedSigflags[NUM_SIGNALS];
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static address resettedSighandler[NUM_SIGNALS];
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static void save_signal(int idx, int sig)
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{
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struct sigaction sa;
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sigaction(sig, NULL, &sa);
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resettedSigflags[idx] = sa.sa_flags;
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resettedSighandler[idx] = (sa.sa_flags & SA_SIGINFO)
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? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
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: CAST_FROM_FN_PTR(address, sa.sa_handler);
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}
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int VMError::get_resetted_sigflags(int sig) {
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for (int i = 0; i < NUM_SIGNALS; i++) {
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if (SIGNALS[i] == sig) {
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return resettedSigflags[i];
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}
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}
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return -1;
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}
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address VMError::get_resetted_sighandler(int sig) {
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for (int i = 0; i < NUM_SIGNALS; i++) {
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if (SIGNALS[i] == sig) {
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return resettedSighandler[i];
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}
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}
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return NULL;
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}
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static void crash_handler(int sig, siginfo_t* info, void* ucVoid) {
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// unmask current signal
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sigset_t newset;
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sigemptyset(&newset);
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sigaddset(&newset, sig);
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// also unmask other synchronous signals
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for (int i = 0; i < NUM_SIGNALS; i++) {
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sigaddset(&newset, SIGNALS[i]);
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}
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thr_sigsetmask(SIG_UNBLOCK, &newset, NULL);
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VMError err(NULL, sig, NULL, info, ucVoid);
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err.report_and_die();
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}
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void VMError::reset_signal_handlers() {
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// install signal handlers for all synchronous program error signals
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sigset_t newset;
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sigemptyset(&newset);
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for (int i = 0; i < NUM_SIGNALS; i++) {
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save_signal(i, SIGNALS[i]);
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os::signal(SIGNALS[i], CAST_FROM_FN_PTR(void *, crash_handler));
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sigaddset(&newset, SIGNALS[i]);
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}
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thr_sigsetmask(SIG_UNBLOCK, &newset, NULL);
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}
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