Mercurial > hg > truffle
view src/os/solaris/vm/jsig.c @ 14838:945e622f5e2f
Removed unused LIRGeneratorInterfaces.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Tue, 25 Mar 2014 16:01:18 +0100 |
parents | f95d63e2154a |
children |
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/* * Copyright (c) 2001, 2010, 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 <stdlib.h> #include <stdio.h> #include <string.h> #include <signal.h> #include <dlfcn.h> #include <thread.h> #include <synch.h> #include "jvm_solaris.h" #define bool int #define true 1 #define false 0 static struct sigaction *sact = (struct sigaction *)NULL; /* saved signal handlers */ static sigset_t jvmsigs; /* used to synchronize the installation of signal handlers */ static mutex_t mutex = DEFAULTMUTEX; static cond_t cond = DEFAULTCV; static thread_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; /* assume called within signal_lock */ static void allocate_sact() { size_t maxsignum; maxsignum = SIGRTMAX; if (sact == NULL) { sact = (struct sigaction *)malloc((maxsignum+1) * (size_t)sizeof(struct sigaction)); memset(sact, 0, (maxsignum+1) * (size_t)sizeof(struct sigaction)); } if (sact == NULL) { printf("%s\n", "libjsig.so unable to allocate memory"); exit(0); } sigemptyset(&jvmsigs); } static void signal_lock() { 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 != thr_self()) { cond_wait(&cond, &mutex); } } } static void signal_unlock() { mutex_unlock(&mutex); } static sa_handler_t call_os_signal(int sig, sa_handler_t disp, bool is_sigset) { 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); } } return (*os_signal)(sig, disp); } static void save_signal_handler(int sig, sa_handler_t disp, bool is_sigset) { sigset_t set; if (sact == NULL) { allocate_sact(); } sact[sig].sa_handler = disp; sigemptyset(&set); sact[sig].sa_mask = set; if (!is_sigset) { sact[sig].sa_flags = SA_NODEFER; if (sig != SIGILL && sig != SIGTRAP && sig != SIGPWR) { sact[sig].sa_flags |= SA_RESETHAND; } } else { 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 sigblocked; signal_lock(); if (sact == NULL) { allocate_sact(); } if (jvm_signal_installed && sigismember(&jvmsigs, sig)) { /* jvm has installed its signal handler for this signal. */ /* Save the handler. Don't really install it. */ if (is_sigset) { /* We won't honor the SIG_HOLD request to change the signal mask */ sigblocked = sigismember(&(sact[sig].sa_mask), sig); } oldhandler = sact[sig].sa_handler; save_signal_handler(sig, disp, is_sigset); if (is_sigset && sigblocked) { oldhandler = SIG_HOLD; } 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, is_sigset); /* Record the signals used by jvm */ sigaddset(&jvmsigs, 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) { return set_signal(sig, disp, true); } 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; struct sigaction oldAct; signal_lock(); if (sact == NULL ) { allocate_sact(); } if (jvm_signal_installed && sigismember(&jvmsigs, sig)) { /* 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 */ sigaddset(&jvmsigs, 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 four functions for the jvm to call into */ void JVM_begin_signal_setting() { signal_lock(); jvm_signal_installing = true; tid = thr_self(); signal_unlock(); } void JVM_end_signal_setting() { signal_lock(); jvm_signal_installed = true; jvm_signal_installing = false; cond_broadcast(&cond); signal_unlock(); } struct sigaction *JVM_get_signal_action(int sig) { if (sact == NULL) { allocate_sact(); } /* Does race condition make sense here? */ if (sigismember(&jvmsigs, sig)) { return &sact[sig]; } return NULL; } int JVM_get_libjsig_version() { return JSIG_VERSION_1_4_1; }