1 /* 2 * Copyright (c) 2020, 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 #ifndef OS_POSIX_SIGNALS_POSIX_HPP 26 #define OS_POSIX_SIGNALS_POSIX_HPP 27 28 #include "memory/allocation.hpp" 29 #include "utilities/globalDefinitions.hpp" 30 31 class outputStream; 32 class Thread; 33 class OSThread; 34 35 class PosixSignals : public AllStatic { 36 37 public: 38 39 // Signal number used to suspend/resume a thread 40 static int SR_signum; 41 42 static int init(); 43 // The platform dependent parts of the central hotspot signal handler. 44 // Returns true if the signal had been recognized and handled, false if not. If true, caller should 45 // return from signal handling. 46 static bool pd_hotspot_signal_handler(int sig, siginfo_t* info, ucontext_t* uc, JavaThread* thread); 47 48 static bool is_sig_ignored(int sig); 49 50 static void hotspot_sigmask(Thread* thread); 51 52 static void print_signal_handler(outputStream* st, int sig, char* buf, size_t buflen); 53 54 // Suspend-resume 55 static bool do_suspend(OSThread* osthread); 56 static void do_resume(OSThread* osthread); 57 58 // For signal-chaining 59 static bool chained_handler(int sig, siginfo_t* siginfo, void* context); 60 61 // Unblock all signals whose delivery cannot be deferred and which, if they happen 62 // while delivery is blocked, would cause crashes or hangs (see JDK-8252533). 63 static void unblock_error_signals(); 64 }; 65 66 #endif // OS_POSIX_SIGNALS_POSIX_HPP 67