1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/os/linux/vm/vmError_linux.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,112 @@
1.4 +/*
1.5 + * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +# include "incls/_precompiled.incl"
1.29 +# include "incls/_vmError_linux.cpp.incl"
1.30 +
1.31 +#include <sys/types.h>
1.32 +#include <sys/wait.h>
1.33 +#include <sys/syscall.h>
1.34 +#include <unistd.h>
1.35 +#include <signal.h>
1.36 +
1.37 +void VMError::show_message_box(char *buf, int buflen) {
1.38 + bool yes;
1.39 + do {
1.40 + error_string(buf, buflen);
1.41 + int len = (int)strlen(buf);
1.42 + char *p = &buf[len];
1.43 +
1.44 + jio_snprintf(p, buflen - len,
1.45 + "\n\n"
1.46 + "Do you want to debug the problem?\n\n"
1.47 + "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT "\n"
1.48 + "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
1.49 + "Otherwise, press RETURN to abort...",
1.50 + os::current_process_id(), os::current_process_id(),
1.51 + os::current_thread_id());
1.52 +
1.53 + yes = os::message_box("Unexpected Error", buf);
1.54 +
1.55 + if (yes) {
1.56 + // yes, user asked VM to launch debugger
1.57 + jio_snprintf(buf, buflen, "gdb /proc/%d/exe %d",
1.58 + os::current_process_id(), os::current_process_id());
1.59 +
1.60 + os::fork_and_exec(buf);
1.61 + yes = false;
1.62 + }
1.63 + } while (yes);
1.64 +}
1.65 +
1.66 +// Space for our "saved" signal flags and handlers
1.67 +static int resettedSigflags[2];
1.68 +static address resettedSighandler[2];
1.69 +
1.70 +static void save_signal(int idx, int sig)
1.71 +{
1.72 + struct sigaction sa;
1.73 + sigaction(sig, NULL, &sa);
1.74 + resettedSigflags[idx] = sa.sa_flags;
1.75 + resettedSighandler[idx] = (sa.sa_flags & SA_SIGINFO)
1.76 + ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
1.77 + : CAST_FROM_FN_PTR(address, sa.sa_handler);
1.78 +}
1.79 +
1.80 +int VMError::get_resetted_sigflags(int sig) {
1.81 + if(SIGSEGV == sig) {
1.82 + return resettedSigflags[0];
1.83 + } else if(SIGBUS == sig) {
1.84 + return resettedSigflags[1];
1.85 + }
1.86 + return -1;
1.87 +}
1.88 +
1.89 +address VMError::get_resetted_sighandler(int sig) {
1.90 + if(SIGSEGV == sig) {
1.91 + return resettedSighandler[0];
1.92 + } else if(SIGBUS == sig) {
1.93 + return resettedSighandler[1];
1.94 + }
1.95 + return NULL;
1.96 +}
1.97 +
1.98 +static void crash_handler(int sig, siginfo_t* info, void* ucVoid) {
1.99 + // unmask current signal
1.100 + sigset_t newset;
1.101 + sigemptyset(&newset);
1.102 + sigaddset(&newset, sig);
1.103 + sigprocmask(SIG_UNBLOCK, &newset, NULL);
1.104 +
1.105 + VMError err(NULL, sig, NULL, info, ucVoid);
1.106 + err.report_and_die();
1.107 +}
1.108 +
1.109 +void VMError::reset_signal_handlers() {
1.110 + // Save sigflags for resetted signals
1.111 + save_signal(0, SIGSEGV);
1.112 + save_signal(1, SIGBUS);
1.113 + os::signal(SIGSEGV, CAST_FROM_FN_PTR(void *, crash_handler));
1.114 + os::signal(SIGBUS, CAST_FROM_FN_PTR(void *, crash_handler));
1.115 +}
