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comparison src/os/bsd/vm/vmError_bsd.cpp @ 3960:f08d439fab8c

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7089790: integrate bsd-port changes Reviewed-by: kvn, twisti, jrose Contributed-by: Kurt Miller <kurt@intricatesoftware.com>, Greg Lewis <glewis@eyesbeyond.com>, Jung-uk Kim <jkim@freebsd.org>, Christos Zoulas <christos@zoulas.com>, Landon Fuller <landonf@plausible.coop>, The FreeBSD Foundation <board@freebsdfoundation.org>, Michael Franz <mvfranz@gmail.com>, Roger Hoover <rhoover@apple.com>, Alexander Strange <astrange@apple.com>
author never
date Sun, 25 Sep 2011 16:03:29 -0700
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3959:eda6988c0d81 3960:f08d439fab8c
1 /*
2 * Copyright (c) 2003, 2010, 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 "precompiled.hpp"
26 #include "runtime/arguments.hpp"
27 #include "runtime/os.hpp"
28 #include "runtime/thread.hpp"
29 #include "utilities/vmError.hpp"
30
31 #include <sys/types.h>
32 #include <sys/wait.h>
33 #include <sys/syscall.h>
34 #include <unistd.h>
35 #include <signal.h>
36
37 void VMError::show_message_box(char *buf, int buflen) {
38 bool yes;
39 do {
40 error_string(buf, buflen);
41 int len = (int)strlen(buf);
42 char *p = &buf[len];
43
44 jio_snprintf(p, buflen - len,
45 "\n\n"
46 "Do you want to debug the problem?\n\n"
47 "To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT " (" INTPTR_FORMAT ")\n"
48 "Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
49 "Otherwise, press RETURN to abort...",
50 os::current_process_id(), os::current_process_id(),
51 os::current_thread_id(), os::current_thread_id());
52
53 yes = os::message_box("Unexpected Error", buf);
54
55 if (yes) {
56 // yes, user asked VM to launch debugger
57 jio_snprintf(buf, buflen, "gdb /proc/%d/exe %d",
58 os::current_process_id(), os::current_process_id());
59
60 os::fork_and_exec(buf);
61 yes = false;
62 }
63 } while (yes);
64 }
65
66 // Space for our "saved" signal flags and handlers
67 static int resettedSigflags[2];
68 static address resettedSighandler[2];
69
70 static void save_signal(int idx, int sig)
71 {
72 struct sigaction sa;
73 sigaction(sig, NULL, &sa);
74 resettedSigflags[idx] = sa.sa_flags;
75 resettedSighandler[idx] = (sa.sa_flags & SA_SIGINFO)
76 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
77 : CAST_FROM_FN_PTR(address, sa.sa_handler);
78 }
79
80 int VMError::get_resetted_sigflags(int sig) {
81 if(SIGSEGV == sig) {
82 return resettedSigflags[0];
83 } else if(SIGBUS == sig) {
84 return resettedSigflags[1];
85 }
86 return -1;
87 }
88
89 address VMError::get_resetted_sighandler(int sig) {
90 if(SIGSEGV == sig) {
91 return resettedSighandler[0];
92 } else if(SIGBUS == sig) {
93 return resettedSighandler[1];
94 }
95 return NULL;
96 }
97
98 static void crash_handler(int sig, siginfo_t* info, void* ucVoid) {
99 // unmask current signal
100 sigset_t newset;
101 sigemptyset(&newset);
102 sigaddset(&newset, sig);
103 sigprocmask(SIG_UNBLOCK, &newset, NULL);
104
105 VMError err(NULL, sig, NULL, info, ucVoid);
106 err.report_and_die();
107 }
108
109 void VMError::reset_signal_handlers() {
110 // Save sigflags for resetted signals
111 save_signal(0, SIGSEGV);
112 save_signal(1, SIGBUS);
113 os::signal(SIGSEGV, CAST_FROM_FN_PTR(void *, crash_handler));
114 os::signal(SIGBUS, CAST_FROM_FN_PTR(void *, crash_handler));
115 }