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