1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/os/posix/vm/os_posix.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,84 @@
1.4 +/*
1.5 + * Copyright (c) 1999, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef OS_POSIX_VM_OS_POSIX_HPP
1.29 +#define OS_POSIX_VM_OS_POSIX_HPP
1.30 +class Posix {
1.31 + friend class os;
1.32 +
1.33 +protected:
1.34 + static void print_distro_info(outputStream* st);
1.35 + static void print_rlimit_info(outputStream* st);
1.36 + static void print_uname_info(outputStream* st);
1.37 + static void print_libversion_info(outputStream* st);
1.38 + static void print_load_average(outputStream* st);
1.39 +
1.40 +public:
1.41 +
1.42 + // Returns true if signal is valid.
1.43 + static bool is_valid_signal(int sig);
1.44 +
1.45 + // Helper function, returns a string (e.g. "SIGILL") for a signal.
1.46 + // Returned string is a constant. For unknown signals "UNKNOWN" is returned.
1.47 + static const char* get_signal_name(int sig, char* out, size_t outlen);
1.48 +
1.49 + // Returns one-line short description of a signal set in a user provided buffer.
1.50 + static const char* describe_signal_set_short(const sigset_t* set, char* buffer, size_t size);
1.51 +
1.52 + // Prints a short one-line description of a signal set.
1.53 + static void print_signal_set_short(outputStream* st, const sigset_t* set);
1.54 +
1.55 + // Writes a one-line description of a combination of sigaction.sa_flags
1.56 + // into a user provided buffer. Returns that buffer.
1.57 + static const char* describe_sa_flags(int flags, char* buffer, size_t size);
1.58 +
1.59 + // Prints a one-line description of a combination of sigaction.sa_flags.
1.60 + static void print_sa_flags(outputStream* st, int flags);
1.61 +
1.62 + // A POSIX conform, platform-independend siginfo print routine.
1.63 + static void print_siginfo_brief(outputStream* os, const siginfo_t* si);
1.64 +
1.65 +};
1.66 +
1.67 +/*
1.68 + * Crash protection for the watcher thread. Wrap the callback
1.69 + * with a sigsetjmp and in case of a SIGSEGV/SIGBUS we siglongjmp
1.70 + * back.
1.71 + * To be able to use this - don't take locks, don't rely on destructors,
1.72 + * don't make OS library calls, don't allocate memory, don't print,
1.73 + * don't call code that could leave the heap / memory in an inconsistent state,
1.74 + * or anything else where we are not in control if we suddenly jump out.
1.75 + */
1.76 +class WatcherThreadCrashProtection : public StackObj {
1.77 +public:
1.78 + WatcherThreadCrashProtection();
1.79 + bool call(os::CrashProtectionCallback& cb);
1.80 +
1.81 + static void check_crash_protection(int signal, Thread* thread);
1.82 +private:
1.83 + void restore();
1.84 + sigjmp_buf _jmpbuf;
1.85 +};
1.86 +
1.87 +#endif // OS_POSIX_VM_OS_POSIX_HPP
