1 /*
2 * Copyright (c) 1999, 2013, 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 *
45
46 // Returns one-line short description of a signal set in a user provided buffer.
47 static const char* describe_signal_set_short(const sigset_t* set, char* buffer, size_t size);
48
49 // Prints a short one-line description of a signal set.
50 static void print_signal_set_short(outputStream* st, const sigset_t* set);
51
52 // Writes a one-line description of a combination of sigaction.sa_flags
53 // into a user provided buffer. Returns that buffer.
54 static const char* describe_sa_flags(int flags, char* buffer, size_t size);
55
56 // Prints a one-line description of a combination of sigaction.sa_flags.
57 static void print_sa_flags(outputStream* st, int flags);
58
59 // A POSIX conform, platform-independend siginfo print routine.
60 static void print_siginfo_brief(outputStream* os, const siginfo_t* si);
61
62 };
63
64 /*
65 * Crash protection for the watcher thread. Wrap the callback
66 * with a sigsetjmp and in case of a SIGSEGV/SIGBUS we siglongjmp
67 * back.
68 * To be able to use this - don't take locks, don't rely on destructors,
69 * don't make OS library calls, don't allocate memory, don't print,
70 * don't call code that could leave the heap / memory in an inconsistent state,
71 * or anything else where we are not in control if we suddenly jump out.
72 */
73 class WatcherThreadCrashProtection : public StackObj {
74 public:
75 WatcherThreadCrashProtection();
76 bool call(os::CrashProtectionCallback& cb);
77
78 static void check_crash_protection(int signal, Thread* thread);
79 private:
80 void restore();
81 sigjmp_buf _jmpbuf;
82 };
83
84 #endif // OS_POSIX_VM_OS_POSIX_HPP
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1 /*
2 * Copyright (c) 1999, 2019, 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 *
45
46 // Returns one-line short description of a signal set in a user provided buffer.
47 static const char* describe_signal_set_short(const sigset_t* set, char* buffer, size_t size);
48
49 // Prints a short one-line description of a signal set.
50 static void print_signal_set_short(outputStream* st, const sigset_t* set);
51
52 // Writes a one-line description of a combination of sigaction.sa_flags
53 // into a user provided buffer. Returns that buffer.
54 static const char* describe_sa_flags(int flags, char* buffer, size_t size);
55
56 // Prints a one-line description of a combination of sigaction.sa_flags.
57 static void print_sa_flags(outputStream* st, int flags);
58
59 // A POSIX conform, platform-independend siginfo print routine.
60 static void print_siginfo_brief(outputStream* os, const siginfo_t* si);
61
62 };
63
64 /*
65 * Crash protection utility used by JFR. Wrap the callback
66 * with a sigsetjmp and in case of a SIGSEGV/SIGBUS we siglongjmp
67 * back.
68 * To be able to use this - don't take locks, don't rely on destructors,
69 * don't make OS library calls, don't allocate memory, don't print,
70 * don't call code that could leave the heap / memory in an inconsistent state,
71 * or anything else where we are not in control if we suddenly jump out.
72 */
73 class ThreadCrashProtection : public StackObj {
74 public:
75 static bool is_crash_protected(Thread* thr) {
76 return _crash_protection != NULL && _protected_thread == thr;
77 }
78
79 ThreadCrashProtection();
80 bool call(os::CrashProtectionCallback& cb);
81
82 static void check_crash_protection(int signal, Thread* thread);
83 private:
84 static Thread* _protected_thread;
85 static ThreadCrashProtection* _crash_protection;
86 static volatile intptr_t _crash_mux;
87 void restore();
88 sigjmp_buf _jmpbuf;
89 };
90
91 /*
92 * Crash protection for the watcher thread. Wrap the callback
93 * with a sigsetjmp and in case of a SIGSEGV/SIGBUS we siglongjmp
94 * back.
95 * To be able to use this - don't take locks, don't rely on destructors,
96 * don't make OS library calls, don't allocate memory, don't print,
97 * don't call code that could leave the heap / memory in an inconsistent state,
98 * or anything else where we are not in control if we suddenly jump out.
99 */
100 class WatcherThreadCrashProtection : public StackObj {
101 public:
102 WatcherThreadCrashProtection();
103 bool call(os::CrashProtectionCallback& cb);
104
105 static void check_crash_protection(int signal, Thread* thread);
106 private:
107 void restore();
108 sigjmp_buf _jmpbuf;
109 };
110
111 #endif // OS_POSIX_VM_OS_POSIX_HPP
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