author | stuefe |
Wed, 09 Dec 2015 14:56:02 +0100 | |
changeset 35176 | 11a9d4022d9e |
parent 35077 | 8b86440d3bf1 |
child 36355 | dd339cbafd31 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "runtime/os.hpp" |
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#ifndef OS_POSIX_VM_OS_POSIX_HPP |
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#define OS_POSIX_VM_OS_POSIX_HPP |
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// File conventions |
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static const char* file_separator() { return "/"; } |
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static const char* line_separator() { return "\n"; } |
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static const char* path_separator() { return ":"; } |
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class Posix { |
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friend class os; |
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protected: |
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static void print_distro_info(outputStream* st); |
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static void print_rlimit_info(outputStream* st); |
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static void print_uname_info(outputStream* st); |
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static void print_libversion_info(outputStream* st); |
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static void print_load_average(outputStream* st); |
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public: |
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// Returns true if signal is valid. |
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static bool is_valid_signal(int sig); |
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// Helper function, returns a string (e.g. "SIGILL") for a signal. |
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// Returned string is a constant. For unknown signals "UNKNOWN" is returned. |
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static const char* get_signal_name(int sig, char* out, size_t outlen); |
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// Helper function, returns a signal number for a given signal name, e.g. 11 |
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// for "SIGSEGV". Name can be given with or without "SIG" prefix, so both |
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// "SEGV" or "SIGSEGV" work. Name must be uppercase. |
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// Returns -1 for an unknown signal name. |
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static int get_signal_number(const char* signal_name); |
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// Returns one-line short description of a signal set in a user provided buffer. |
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static const char* describe_signal_set_short(const sigset_t* set, char* buffer, size_t size); |
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// Prints a short one-line description of a signal set. |
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static void print_signal_set_short(outputStream* st, const sigset_t* set); |
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// unblocks the signal masks for current thread |
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static int unblock_thread_signal_mask(const sigset_t *set); |
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// Writes a one-line description of a combination of sigaction.sa_flags |
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// into a user provided buffer. Returns that buffer. |
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static const char* describe_sa_flags(int flags, char* buffer, size_t size); |
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// Prints a one-line description of a combination of sigaction.sa_flags. |
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static void print_sa_flags(outputStream* st, int flags); |
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static address ucontext_get_pc(const ucontext_t* ctx); |
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// Set PC into context. Needed for continuation after signal. |
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static void ucontext_set_pc(ucontext_t* ctx, address pc); |
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}; |
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/* |
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* Crash protection for the watcher thread. Wrap the callback |
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* with a sigsetjmp and in case of a SIGSEGV/SIGBUS we siglongjmp |
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* back. |
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* To be able to use this - don't take locks, don't rely on destructors, |
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* don't make OS library calls, don't allocate memory, don't print, |
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* don't call code that could leave the heap / memory in an inconsistent state, |
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* or anything else where we are not in control if we suddenly jump out. |
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*/ |
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class WatcherThreadCrashProtection : public StackObj { |
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WatcherThreadCrashProtection(); |
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bool call(os::CrashProtectionCallback& cb); |
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static void check_crash_protection(int signal, Thread* thread); |
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void restore(); |
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sigjmp_buf _jmpbuf; |
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}; |
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#endif // OS_POSIX_VM_OS_POSIX_HPP |