nloodin@3783: /*
mikael@6198:  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
nloodin@3783:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
nloodin@3783:  *
nloodin@3783:  * This code is free software; you can redistribute it and/or modify it
nloodin@3783:  * under the terms of the GNU General Public License version 2 only, as
nloodin@3783:  * published by the Free Software Foundation.
nloodin@3783:  *
nloodin@3783:  * This code is distributed in the hope that it will be useful, but WITHOUT
nloodin@3783:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
nloodin@3783:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
nloodin@3783:  * version 2 for more details (a copy is included in the LICENSE file that
nloodin@3783:  * accompanied this code).
nloodin@3783:  *
nloodin@3783:  * You should have received a copy of the GNU General Public License version
nloodin@3783:  * 2 along with this work; if not, write to the Free Software Foundation,
nloodin@3783:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
nloodin@3783:  *
nloodin@3783:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
nloodin@3783:  * or visit www.oracle.com if you need additional information or have any
nloodin@3783:  * questions.
nloodin@3783:  *
nloodin@3783:  */
nloodin@3783: 
nloodin@3783: #ifndef OS_POSIX_VM_OS_POSIX_HPP
nloodin@3783: #define OS_POSIX_VM_OS_POSIX_HPP
nloodin@3783: class Posix {
nloodin@3783:   friend class os;
nloodin@3783: 
nloodin@3783: protected:
nloodin@3783:   static void print_distro_info(outputStream* st);
nloodin@3783:   static void print_rlimit_info(outputStream* st);
nloodin@3783:   static void print_uname_info(outputStream* st);
nloodin@3783:   static void print_libversion_info(outputStream* st);
nloodin@3783:   static void print_load_average(outputStream* st);
nloodin@3783: 
goetz@6460: public:
goetz@6460: 
goetz@6460:   // Returns true if signal is valid.
goetz@6460:   static bool is_valid_signal(int sig);
goetz@6460: 
goetz@6460:   // Helper function, returns a string (e.g. "SIGILL") for a signal.
goetz@6460:   // Returned string is a constant. For unknown signals "UNKNOWN" is returned.
goetz@6460:   static const char* get_signal_name(int sig, char* out, size_t outlen);
goetz@6460: 
goetz@6460:   // Returns one-line short description of a signal set in a user provided buffer.
goetz@6460:   static const char* describe_signal_set_short(const sigset_t* set, char* buffer, size_t size);
goetz@6460: 
goetz@6460:   // Prints a short one-line description of a signal set.
goetz@6460:   static void print_signal_set_short(outputStream* st, const sigset_t* set);
goetz@6460: 
goetz@6460:   // Writes a one-line description of a combination of sigaction.sa_flags
goetz@6460:   // into a user provided buffer. Returns that buffer.
goetz@6460:   static const char* describe_sa_flags(int flags, char* buffer, size_t size);
goetz@6460: 
goetz@6460:   // Prints a one-line description of a combination of sigaction.sa_flags.
goetz@6460:   static void print_sa_flags(outputStream* st, int flags);
goetz@6460: 
goetz@6460:   // A POSIX conform, platform-independend siginfo print routine.
goetz@6460:   static void print_siginfo_brief(outputStream* os, const siginfo_t* si);
nloodin@3783: 
nloodin@3783: };
nloodin@3783: 
rbackman@5424: /*
rbackman@5424:  * Crash protection for the watcher thread. Wrap the callback
rbackman@5424:  * with a sigsetjmp and in case of a SIGSEGV/SIGBUS we siglongjmp
rbackman@5424:  * back.
rbackman@5424:  * To be able to use this - don't take locks, don't rely on destructors,
rbackman@5424:  * don't make OS library calls, don't allocate memory, don't print,
rbackman@5424:  * don't call code that could leave the heap / memory in an inconsistent state,
rbackman@5424:  * or anything else where we are not in control if we suddenly jump out.
rbackman@5424:  */
rbackman@5424: class WatcherThreadCrashProtection : public StackObj {
rbackman@5424: public:
rbackman@5424:   WatcherThreadCrashProtection();
rbackman@5424:   bool call(os::CrashProtectionCallback& cb);
rbackman@5424: 
rbackman@5424:   static void check_crash_protection(int signal, Thread* thread);
rbackman@5424: private:
rbackman@5424:   void restore();
rbackman@5424:   sigjmp_buf _jmpbuf;
rbackman@5424: };
nloodin@3783: 
goetz@6460: #endif // OS_POSIX_VM_OS_POSIX_HPP