1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/os/linux/vm/jvm_linux.cpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,202 @@
1.4 +/*
1.5 + * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "incls/_precompiled.incl"
1.29 +#include "incls/_jvm_linux.cpp.incl"
1.30 +
1.31 +#include <signal.h>
1.32 +
1.33 +/*
1.34 + * FIXME: This is temporary hack to keep Linux Runtime.exec()
1.35 + * code happy. See $JDK/src/linux/native/java/lang/UnixProcess_md.c
1.36 + */
1.37 +int _JVM_native_threads = 1;
1.38 +
1.39 +// sun.misc.Signal ///////////////////////////////////////////////////////////
1.40 +// Signal code is mostly copied from classic vm, signals_md.c 1.4 98/08/23
1.41 +/*
1.42 + * This function is included primarily as a debugging aid. If Java is
1.43 + * running in a console window, then pressing <CTRL-\\> will cause
1.44 + * the current state of all active threads and monitors to be written
1.45 + * to the console window.
1.46 + */
1.47 +
1.48 +JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler))
1.49 + // Copied from classic vm
1.50 + // signals_md.c 1.4 98/08/23
1.51 + void* newHandler = handler == (void *)2
1.52 + ? os::user_handler()
1.53 + : handler;
1.54 + switch (sig) {
1.55 + /* The following are already used by the VM. */
1.56 + case INTERRUPT_SIGNAL:
1.57 + case SIGFPE:
1.58 + case SIGILL:
1.59 + case SIGSEGV:
1.60 +
1.61 + /* The following signal is used by the VM to dump thread stacks unless
1.62 + ReduceSignalUsage is set, in which case the user is allowed to set
1.63 + his own _native_ handler for this signal; thus, in either case,
1.64 + we do not allow JVM_RegisterSignal to change the handler. */
1.65 + case BREAK_SIGNAL:
1.66 + return (void *)-1;
1.67 +
1.68 + /* The following signals are used for Shutdown Hooks support. However, if
1.69 + ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
1.70 + System.exit(), Java is not allowed to use these signals, and the the
1.71 + user is allowed to set his own _native_ handler for these signals and
1.72 + invoke System.exit() as needed. Terminator.setup() is avoiding
1.73 + registration of these signals when -Xrs is present.
1.74 + - If the HUP signal is ignored (from the nohup) command, then Java
1.75 + is not allowed to use this signal.
1.76 + */
1.77 +
1.78 + case SHUTDOWN1_SIGNAL:
1.79 + case SHUTDOWN2_SIGNAL:
1.80 + case SHUTDOWN3_SIGNAL:
1.81 + if (ReduceSignalUsage) return (void*)-1;
1.82 + if (os::Linux::is_sig_ignored(sig)) return (void*)1;
1.83 + }
1.84 +
1.85 + void* oldHandler = os::signal(sig, newHandler);
1.86 + if (oldHandler == os::user_handler()) {
1.87 + return (void *)2;
1.88 + } else {
1.89 + return oldHandler;
1.90 + }
1.91 +JVM_END
1.92 +
1.93 +
1.94 +JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
1.95 + if (ReduceSignalUsage) {
1.96 + // do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL,
1.97 + // BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since
1.98 + // no handler for them is actually registered in JVM or via
1.99 + // JVM_RegisterSignal.
1.100 + if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
1.101 + sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) {
1.102 + return JNI_FALSE;
1.103 + }
1.104 + }
1.105 + else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
1.106 + sig == SHUTDOWN3_SIGNAL) && os::Linux::is_sig_ignored(sig)) {
1.107 + // do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL
1.108 + // is ignored, since no handler for them is actually registered in JVM
1.109 + // or via JVM_RegisterSignal.
1.110 + // This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL
1.111 + return JNI_FALSE;
1.112 + }
1.113 +
1.114 + os::signal_raise(sig);
1.115 + return JNI_TRUE;
1.116 +JVM_END
1.117 +
1.118 +/*
1.119 + All the defined signal names for Linux.
1.120 +
1.121 + NOTE that not all of these names are accepted by our Java implementation
1.122 +
1.123 + Via an existing claim by the VM, sigaction restrictions, or
1.124 + the "rules of Unix" some of these names will be rejected at runtime.
1.125 + For example the VM sets up to handle USR1, sigaction returns EINVAL for
1.126 + STOP, and Linux simply doesn't allow catching of KILL.
1.127 +
1.128 + Here are the names currently accepted by a user of sun.misc.Signal with
1.129 + 1.4.1 (ignoring potential interaction with use of chaining, etc):
1.130 +
1.131 + HUP, INT, TRAP, ABRT, IOT, BUS, USR2, PIPE, ALRM, TERM, STKFLT,
1.132 + CLD, CHLD, CONT, TSTP, TTIN, TTOU, URG, XCPU, XFSZ, VTALRM, PROF,
1.133 + WINCH, POLL, IO, PWR, SYS
1.134 +
1.135 +*/
1.136 +
1.137 +struct siglabel {
1.138 + char *name;
1.139 + int number;
1.140 +};
1.141 +
1.142 +struct siglabel siglabels[] = {
1.143 + /* derived from /usr/include/bits/signum.h on RH7.2 */
1.144 + "HUP", SIGHUP, /* Hangup (POSIX). */
1.145 + "INT", SIGINT, /* Interrupt (ANSI). */
1.146 + "QUIT", SIGQUIT, /* Quit (POSIX). */
1.147 + "ILL", SIGILL, /* Illegal instruction (ANSI). */
1.148 + "TRAP", SIGTRAP, /* Trace trap (POSIX). */
1.149 + "ABRT", SIGABRT, /* Abort (ANSI). */
1.150 + "IOT", SIGIOT, /* IOT trap (4.2 BSD). */
1.151 + "BUS", SIGBUS, /* BUS error (4.2 BSD). */
1.152 + "FPE", SIGFPE, /* Floating-point exception (ANSI). */
1.153 + "KILL", SIGKILL, /* Kill, unblockable (POSIX). */
1.154 + "USR1", SIGUSR1, /* User-defined signal 1 (POSIX). */
1.155 + "SEGV", SIGSEGV, /* Segmentation violation (ANSI). */
1.156 + "USR2", SIGUSR2, /* User-defined signal 2 (POSIX). */
1.157 + "PIPE", SIGPIPE, /* Broken pipe (POSIX). */
1.158 + "ALRM", SIGALRM, /* Alarm clock (POSIX). */
1.159 + "TERM", SIGTERM, /* Termination (ANSI). */
1.160 +#ifdef SIGSTKFLT
1.161 + "STKFLT", SIGSTKFLT, /* Stack fault. */
1.162 +#endif
1.163 + "CLD", SIGCLD, /* Same as SIGCHLD (System V). */
1.164 + "CHLD", SIGCHLD, /* Child status has changed (POSIX). */
1.165 + "CONT", SIGCONT, /* Continue (POSIX). */
1.166 + "STOP", SIGSTOP, /* Stop, unblockable (POSIX). */
1.167 + "TSTP", SIGTSTP, /* Keyboard stop (POSIX). */
1.168 + "TTIN", SIGTTIN, /* Background read from tty (POSIX). */
1.169 + "TTOU", SIGTTOU, /* Background write to tty (POSIX). */
1.170 + "URG", SIGURG, /* Urgent condition on socket (4.2 BSD). */
1.171 + "XCPU", SIGXCPU, /* CPU limit exceeded (4.2 BSD). */
1.172 + "XFSZ", SIGXFSZ, /* File size limit exceeded (4.2 BSD). */
1.173 + "VTALRM", SIGVTALRM, /* Virtual alarm clock (4.2 BSD). */
1.174 + "PROF", SIGPROF, /* Profiling alarm clock (4.2 BSD). */
1.175 + "WINCH", SIGWINCH, /* Window size change (4.3 BSD, Sun). */
1.176 + "POLL", SIGPOLL, /* Pollable event occurred (System V). */
1.177 + "IO", SIGIO, /* I/O now possible (4.2 BSD). */
1.178 + "PWR", SIGPWR, /* Power failure restart (System V). */
1.179 +#ifdef SIGSYS
1.180 + "SYS", SIGSYS /* Bad system call. Only on some Linuxen! */
1.181 +#endif
1.182 + };
1.183 +
1.184 +JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
1.185 +
1.186 + /* find and return the named signal's number */
1.187 +
1.188 + for(uint i=0; i<ARRAY_SIZE(siglabels); i++)
1.189 + if(!strcmp(name, siglabels[i].name))
1.190 + return siglabels[i].number;
1.191 +
1.192 + return -1;
1.193 +
1.194 +JVM_END
1.195 +
1.196 +// used by os::exception_name()
1.197 +extern bool signal_name(int signo, char* buf, size_t len) {
1.198 + for(uint i = 0; i < ARRAY_SIZE(siglabels); i++) {
1.199 + if (signo == siglabels[i].number) {
1.200 + jio_snprintf(buf, len, "SIG%s", siglabels[i].name);
1.201 + return true;
1.202 + }
1.203 + }
1.204 + return false;
1.205 +}
