--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/os/linux/vm/jvm_linux.cpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,202 @@
+/*
+ * Copyright 1999-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_jvm_linux.cpp.incl"
+
+#include <signal.h>
+
+/*
+ * FIXME: This is temporary hack to keep Linux Runtime.exec()
+ * code happy. See $JDK/src/linux/native/java/lang/UnixProcess_md.c
+ */
+int _JVM_native_threads = 1;
+
+// sun.misc.Signal ///////////////////////////////////////////////////////////
+// Signal code is mostly copied from classic vm, signals_md.c 1.4 98/08/23
+/*
+ * This function is included primarily as a debugging aid. If Java is
+ * running in a console window, then pressing <CTRL-\\> will cause
+ * the current state of all active threads and monitors to be written
+ * to the console window.
+ */
+
+JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler))
+ // Copied from classic vm
+ // signals_md.c 1.4 98/08/23
+ void* newHandler = handler == (void *)2
+ ? os::user_handler()
+ : handler;
+ switch (sig) {
+ /* The following are already used by the VM. */
+ case INTERRUPT_SIGNAL:
+ case SIGFPE:
+ case SIGILL:
+ case SIGSEGV:
+
+ /* The following signal is used by the VM to dump thread stacks unless
+ ReduceSignalUsage is set, in which case the user is allowed to set
+ his own _native_ handler for this signal; thus, in either case,
+ we do not allow JVM_RegisterSignal to change the handler. */
+ case BREAK_SIGNAL:
+ return (void *)-1;
+
+ /* The following signals are used for Shutdown Hooks support. However, if
+ ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
+ System.exit(), Java is not allowed to use these signals, and the the
+ user is allowed to set his own _native_ handler for these signals and
+ invoke System.exit() as needed. Terminator.setup() is avoiding
+ registration of these signals when -Xrs is present.
+ - If the HUP signal is ignored (from the nohup) command, then Java
+ is not allowed to use this signal.
+ */
+
+ case SHUTDOWN1_SIGNAL:
+ case SHUTDOWN2_SIGNAL:
+ case SHUTDOWN3_SIGNAL:
+ if (ReduceSignalUsage) return (void*)-1;
+ if (os::Linux::is_sig_ignored(sig)) return (void*)1;
+ }
+
+ void* oldHandler = os::signal(sig, newHandler);
+ if (oldHandler == os::user_handler()) {
+ return (void *)2;
+ } else {
+ return oldHandler;
+ }
+JVM_END
+
+
+JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
+ if (ReduceSignalUsage) {
+ // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL,
+ // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since
+ // no handler for them is actually registered in JVM or via
+ // JVM_RegisterSignal.
+ if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
+ sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) {
+ return JNI_FALSE;
+ }
+ }
+ else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
+ sig == SHUTDOWN3_SIGNAL) && os::Linux::is_sig_ignored(sig)) {
+ // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL
+ // is ignored, since no handler for them is actually registered in JVM
+ // or via JVM_RegisterSignal.
+ // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL
+ return JNI_FALSE;
+ }
+
+ os::signal_raise(sig);
+ return JNI_TRUE;
+JVM_END
+
+/*
+ All the defined signal names for Linux.
+
+ NOTE that not all of these names are accepted by our Java implementation
+
+ Via an existing claim by the VM, sigaction restrictions, or
+ the "rules of Unix" some of these names will be rejected at runtime.
+ For example the VM sets up to handle USR1, sigaction returns EINVAL for
+ STOP, and Linux simply doesn't allow catching of KILL.
+
+ Here are the names currently accepted by a user of sun.misc.Signal with
+ 1.4.1 (ignoring potential interaction with use of chaining, etc):
+
+ HUP, INT, TRAP, ABRT, IOT, BUS, USR2, PIPE, ALRM, TERM, STKFLT,
+ CLD, CHLD, CONT, TSTP, TTIN, TTOU, URG, XCPU, XFSZ, VTALRM, PROF,
+ WINCH, POLL, IO, PWR, SYS
+
+*/
+
+struct siglabel {
+ char *name;
+ int number;
+};
+
+struct siglabel siglabels[] = {
+ /* derived from /usr/include/bits/signum.h on RH7.2 */
+ "HUP", SIGHUP, /* Hangup (POSIX). */
+ "INT", SIGINT, /* Interrupt (ANSI). */
+ "QUIT", SIGQUIT, /* Quit (POSIX). */
+ "ILL", SIGILL, /* Illegal instruction (ANSI). */
+ "TRAP", SIGTRAP, /* Trace trap (POSIX). */
+ "ABRT", SIGABRT, /* Abort (ANSI). */
+ "IOT", SIGIOT, /* IOT trap (4.2 BSD). */
+ "BUS", SIGBUS, /* BUS error (4.2 BSD). */
+ "FPE", SIGFPE, /* Floating-point exception (ANSI). */
+ "KILL", SIGKILL, /* Kill, unblockable (POSIX). */
+ "USR1", SIGUSR1, /* User-defined signal 1 (POSIX). */
+ "SEGV", SIGSEGV, /* Segmentation violation (ANSI). */
+ "USR2", SIGUSR2, /* User-defined signal 2 (POSIX). */
+ "PIPE", SIGPIPE, /* Broken pipe (POSIX). */
+ "ALRM", SIGALRM, /* Alarm clock (POSIX). */
+ "TERM", SIGTERM, /* Termination (ANSI). */
+#ifdef SIGSTKFLT
+ "STKFLT", SIGSTKFLT, /* Stack fault. */
+#endif
+ "CLD", SIGCLD, /* Same as SIGCHLD (System V). */
+ "CHLD", SIGCHLD, /* Child status has changed (POSIX). */
+ "CONT", SIGCONT, /* Continue (POSIX). */
+ "STOP", SIGSTOP, /* Stop, unblockable (POSIX). */
+ "TSTP", SIGTSTP, /* Keyboard stop (POSIX). */
+ "TTIN", SIGTTIN, /* Background read from tty (POSIX). */
+ "TTOU", SIGTTOU, /* Background write to tty (POSIX). */
+ "URG", SIGURG, /* Urgent condition on socket (4.2 BSD). */
+ "XCPU", SIGXCPU, /* CPU limit exceeded (4.2 BSD). */
+ "XFSZ", SIGXFSZ, /* File size limit exceeded (4.2 BSD). */
+ "VTALRM", SIGVTALRM, /* Virtual alarm clock (4.2 BSD). */
+ "PROF", SIGPROF, /* Profiling alarm clock (4.2 BSD). */
+ "WINCH", SIGWINCH, /* Window size change (4.3 BSD, Sun). */
+ "POLL", SIGPOLL, /* Pollable event occurred (System V). */
+ "IO", SIGIO, /* I/O now possible (4.2 BSD). */
+ "PWR", SIGPWR, /* Power failure restart (System V). */
+#ifdef SIGSYS
+ "SYS", SIGSYS /* Bad system call. Only on some Linuxen! */
+#endif
+ };
+
+JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
+
+ /* find and return the named signal's number */
+
+ for(uint i=0; i<ARRAY_SIZE(siglabels); i++)
+ if(!strcmp(name, siglabels[i].name))
+ return siglabels[i].number;
+
+ return -1;
+
+JVM_END
+
+// used by os::exception_name()
+extern bool signal_name(int signo, char* buf, size_t len) {
+ for(uint i = 0; i < ARRAY_SIZE(siglabels); i++) {
+ if (signo == siglabels[i].number) {
+ jio_snprintf(buf, len, "SIG%s", siglabels[i].name);
+ return true;
+ }
+ }
+ return false;
+}