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 }