200 lines
7.7 KiB
C++
200 lines
7.7 KiB
C++
/*
|
|
* Copyright (c) 1999, 2011, 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.
|
|
*
|
|
*/
|
|
|
|
#include "precompiled.hpp"
|
|
#include "prims/jvm.h"
|
|
#include "runtime/interfaceSupport.hpp"
|
|
#include "runtime/osThread.hpp"
|
|
|
|
#include <signal.h>
|
|
|
|
|
|
// 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 {
|
|
const 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;
|
|
}
|