--- a/src/java.base/macosx/native/libjsig/jsig.c Tue Apr 10 10:18:55 2018 -0700
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,237 +0,0 @@
-/*
- * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- *
- */
-
-/* CopyrightVersion 1.2 */
-
-/* This is a special library that should be loaded before libc &
- * libthread to interpose the signal handler installation functions:
- * sigaction(), signal(), sigset().
- * Used for signal-chaining. See RFE 4381843.
- */
-
-#include <signal.h>
-#include <dlfcn.h>
-#include <pthread.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdbool.h>
-#include <stdint.h>
-
-#define MASK(sig) ((uint32_t)1 << (sig-1)) // 0 is not a signal.
-#if (32 < NSIG-1)
-#error "Not all signals can be encoded in jvmsigs. Adapt its type!"
-#endif
-static struct sigaction sact[NSIG]; /* saved signal handlers */
-static uint32_t jvmsigs = 0; /* signals used by jvm */
-static __thread bool reentry = false; /* prevent reentry deadlock (per-thread) */
-
-/* used to synchronize the installation of signal handlers */
-static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
-static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
-static pthread_t tid = 0;
-
-typedef void (*sa_handler_t)(int);
-typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
-typedef sa_handler_t (*signal_t)(int, sa_handler_t);
-typedef int (*sigaction_t)(int, const struct sigaction *, struct sigaction *);
-
-static signal_t os_signal = 0; /* os's version of signal()/sigset() */
-static sigaction_t os_sigaction = 0; /* os's version of sigaction() */
-
-static bool jvm_signal_installing = false;
-static bool jvm_signal_installed = false;
-
-static void signal_lock() {
- pthread_mutex_lock(&mutex);
- /* When the jvm is installing its set of signal handlers, threads
- * other than the jvm thread should wait */
- if (jvm_signal_installing) {
- if (tid != pthread_self()) {
- pthread_cond_wait(&cond, &mutex);
- }
- }
-}
-
-static void signal_unlock() {
- pthread_mutex_unlock(&mutex);
-}
-
-static sa_handler_t call_os_signal(int sig, sa_handler_t disp,
- bool is_sigset) {
- sa_handler_t res;
-
- if (os_signal == NULL) {
- if (!is_sigset) {
- os_signal = (signal_t)dlsym(RTLD_NEXT, "signal");
- } else {
- os_signal = (signal_t)dlsym(RTLD_NEXT, "sigset");
- }
- if (os_signal == NULL) {
- printf("%s\n", dlerror());
- exit(0);
- }
- }
- reentry = true;
- res = (*os_signal)(sig, disp);
- reentry = false;
- return res;
-}
-
-static void save_signal_handler(int sig, sa_handler_t disp) {
- sigset_t set;
- sact[sig].sa_handler = disp;
- sigemptyset(&set);
- sact[sig].sa_mask = set;
- sact[sig].sa_flags = 0;
-}
-
-static sa_handler_t set_signal(int sig, sa_handler_t disp, bool is_sigset) {
- sa_handler_t oldhandler;
- bool sigused;
-
- signal_lock();
-
- sigused = (MASK(sig) & jvmsigs) != 0;
- if (jvm_signal_installed && sigused) {
- /* jvm has installed its signal handler for this signal. */
- /* Save the handler. Don't really install it. */
- oldhandler = sact[sig].sa_handler;
- save_signal_handler(sig, disp);
-
- signal_unlock();
- return oldhandler;
- } else if (jvm_signal_installing) {
- /* jvm is installing its signal handlers. Install the new
- * handlers and save the old ones. jvm uses sigaction().
- * Leave the piece here just in case. */
- oldhandler = call_os_signal(sig, disp, is_sigset);
- save_signal_handler(sig, oldhandler);
-
- /* Record the signals used by jvm */
- jvmsigs |= MASK(sig);
-
- signal_unlock();
- return oldhandler;
- } else {
- /* jvm has no relation with this signal (yet). Install the
- * the handler. */
- oldhandler = call_os_signal(sig, disp, is_sigset);
-
- signal_unlock();
- return oldhandler;
- }
-}
-
-sa_handler_t signal(int sig, sa_handler_t disp) {
- return set_signal(sig, disp, false);
-}
-
-sa_handler_t sigset(int sig, sa_handler_t disp) {
- printf("sigset() is not supported by BSD");
- exit(0);
- }
-
-static int call_os_sigaction(int sig, const struct sigaction *act,
- struct sigaction *oact) {
- if (os_sigaction == NULL) {
- os_sigaction = (sigaction_t)dlsym(RTLD_NEXT, "sigaction");
- if (os_sigaction == NULL) {
- printf("%s\n", dlerror());
- exit(0);
- }
- }
- return (*os_sigaction)(sig, act, oact);
-}
-
-int sigaction(int sig, const struct sigaction *act, struct sigaction *oact) {
- int res;
- bool sigused;
- struct sigaction oldAct;
-
- if (reentry) {
- return call_os_sigaction(sig, act, oact);
- }
-
- signal_lock();
-
- sigused = (MASK(sig) & jvmsigs) != 0;
- if (jvm_signal_installed && sigused) {
- /* jvm has installed its signal handler for this signal. */
- /* Save the handler. Don't really install it. */
- if (oact != NULL) {
- *oact = sact[sig];
- }
- if (act != NULL) {
- sact[sig] = *act;
- }
-
- signal_unlock();
- return 0;
- } else if (jvm_signal_installing) {
- /* jvm is installing its signal handlers. Install the new
- * handlers and save the old ones. */
- res = call_os_sigaction(sig, act, &oldAct);
- sact[sig] = oldAct;
- if (oact != NULL) {
- *oact = oldAct;
- }
-
- /* Record the signals used by jvm */
- jvmsigs |= MASK(sig);
-
- signal_unlock();
- return res;
- } else {
- /* jvm has no relation with this signal (yet). Install the
- * the handler. */
- res = call_os_sigaction(sig, act, oact);
-
- signal_unlock();
- return res;
- }
-}
-
-/* The three functions for the jvm to call into */
-void JVM_begin_signal_setting() {
- signal_lock();
- jvm_signal_installing = true;
- tid = pthread_self();
- signal_unlock();
-}
-
-void JVM_end_signal_setting() {
- signal_lock();
- jvm_signal_installed = true;
- jvm_signal_installing = false;
- pthread_cond_broadcast(&cond);
- signal_unlock();
-}
-
-struct sigaction *JVM_get_signal_action(int sig) {
- /* Does race condition make sense here? */
- if ((MASK(sig) & jvmsigs) != 0) {
- return &sact[sig];
- }
- return NULL;
-}