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comparison src/os/linux/vm/vmError_linux.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2003-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 # include "incls/_precompiled.incl"
26 # include "incls/_vmError_linux.cpp.incl"
27
28 #include <sys/types.h>
29 #include <sys/wait.h>
30 #include <sys/syscall.h>
31 #include <unistd.h>
32 #include <signal.h>
33
34 void VMError::show_message_box(char *buf, int buflen) {
35 bool yes;
36 do {
37 error_string(buf, buflen);
38 int len = (int)strlen(buf);
39 char *p = &buf[len];
40
41 jio_snprintf(p, buflen - len,
42 "\n\n"
43 "Do you want to debug the problem?\n\n"
44 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT "\n"
45 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
46 "Otherwise, press RETURN to abort...",
47 os::current_process_id(), os::current_process_id(),
48 os::current_thread_id());
49
50 yes = os::message_box("Unexpected Error", buf);
51
52 if (yes) {
53 // yes, user asked VM to launch debugger
54 jio_snprintf(buf, buflen, "gdb /proc/%d/exe %d",
55 os::current_process_id(), os::current_process_id());
56
57 os::fork_and_exec(buf);
58 yes = false;
59 }
60 } while (yes);
61 }
62
63 // Space for our "saved" signal flags and handlers
64 static int resettedSigflags[2];
65 static address resettedSighandler[2];
66
67 static void save_signal(int idx, int sig)
68 {
69 struct sigaction sa;
70 sigaction(sig, NULL, &sa);
71 resettedSigflags[idx] = sa.sa_flags;
72 resettedSighandler[idx] = (sa.sa_flags & SA_SIGINFO)
73 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
74 : CAST_FROM_FN_PTR(address, sa.sa_handler);
75 }
76
77 int VMError::get_resetted_sigflags(int sig) {
78 if(SIGSEGV == sig) {
79 return resettedSigflags[0];
80 } else if(SIGBUS == sig) {
81 return resettedSigflags[1];
82 }
83 return -1;
84 }
85
86 address VMError::get_resetted_sighandler(int sig) {
87 if(SIGSEGV == sig) {
88 return resettedSighandler[0];
89 } else if(SIGBUS == sig) {
90 return resettedSighandler[1];
91 }
92 return NULL;
93 }
94
95 static void crash_handler(int sig, siginfo_t* info, void* ucVoid) {
96 // unmask current signal
97 sigset_t newset;
98 sigemptyset(&newset);
99 sigaddset(&newset, sig);
100 sigprocmask(SIG_UNBLOCK, &newset, NULL);
101
102 VMError err(NULL, sig, NULL, info, ucVoid);
103 err.report_and_die();
104 }
105
106 void VMError::reset_signal_handlers() {
107 // Save sigflags for resetted signals
108 save_signal(0, SIGSEGV);
109 save_signal(1, SIGBUS);
110 os::signal(SIGSEGV, CAST_FROM_FN_PTR(void *, crash_handler));
111 os::signal(SIGBUS, CAST_FROM_FN_PTR(void *, crash_handler));
112 }