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src/os/linux/vm/jvm_linux.cpp@9c2ecc2ffb12 (annotated)

src/os/linux/vm/jvm_linux.cpp

Fri, 11 Jul 2008 01:14:44 -0700

author

trims

date

Fri, 11 Jul 2008 01:14:44 -0700

changeset 670

9c2ecc2ffb12

parent 634

f139919897d2

child 1907

c18cbe5936b8

permissions

-rw-r--r--

Merge

duke@435	1	/*
duke@435	2	* Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	#include "incls/_precompiled.incl"
duke@435	26	#include "incls/_jvm_linux.cpp.incl"
duke@435	27
duke@435	28	#include <signal.h>
duke@435	29
duke@435	30	/*
duke@435	31	* FIXME: This is temporary hack to keep Linux Runtime.exec()
duke@435	32	* code happy. See $JDK/src/linux/native/java/lang/UnixProcess_md.c
duke@435	33	*/
duke@435	34	int _JVM_native_threads = 1;
duke@435	35
duke@435	36	// sun.misc.Signal ///////////////////////////////////////////////////////////
duke@435	37	// Signal code is mostly copied from classic vm, signals_md.c 1.4 98/08/23
duke@435	38	/*
duke@435	39	* This function is included primarily as a debugging aid. If Java is
duke@435	40	* running in a console window, then pressing <CTRL-\\> will cause
duke@435	41	* the current state of all active threads and monitors to be written
duke@435	42	* to the console window.
duke@435	43	*/
duke@435	44
duke@435	45	JVM_ENTRY_NO_ENV(void*, JVM_RegisterSignal(jint sig, void* handler))
duke@435	46	// Copied from classic vm
duke@435	47	// signals_md.c 1.4 98/08/23
duke@435	48	void* newHandler = handler == (void *)2
duke@435	49	? os::user_handler()
duke@435	50	: handler;
duke@435	51	switch (sig) {
duke@435	52	/* The following are already used by the VM. */
duke@435	53	case INTERRUPT_SIGNAL:
duke@435	54	case SIGFPE:
duke@435	55	case SIGILL:
duke@435	56	case SIGSEGV:
duke@435	57
duke@435	58	/* The following signal is used by the VM to dump thread stacks unless
duke@435	59	ReduceSignalUsage is set, in which case the user is allowed to set
duke@435	60	his own _native_ handler for this signal; thus, in either case,
duke@435	61	we do not allow JVM_RegisterSignal to change the handler. */
duke@435	62	case BREAK_SIGNAL:
duke@435	63	return (void *)-1;
duke@435	64
duke@435	65	/* The following signals are used for Shutdown Hooks support. However, if
duke@435	66	ReduceSignalUsage (-Xrs) is set, Shutdown Hooks must be invoked via
duke@435	67	System.exit(), Java is not allowed to use these signals, and the the
duke@435	68	user is allowed to set his own _native_ handler for these signals and
duke@435	69	invoke System.exit() as needed. Terminator.setup() is avoiding
duke@435	70	registration of these signals when -Xrs is present.
duke@435	71	- If the HUP signal is ignored (from the nohup) command, then Java
duke@435	72	is not allowed to use this signal.
duke@435	73	*/
duke@435	74
duke@435	75	case SHUTDOWN1_SIGNAL:
duke@435	76	case SHUTDOWN2_SIGNAL:
duke@435	77	case SHUTDOWN3_SIGNAL:
duke@435	78	if (ReduceSignalUsage) return (void*)-1;
duke@435	79	if (os::Linux::is_sig_ignored(sig)) return (void*)1;
duke@435	80	}
duke@435	81
duke@435	82	void* oldHandler = os::signal(sig, newHandler);
duke@435	83	if (oldHandler == os::user_handler()) {
duke@435	84	return (void *)2;
duke@435	85	} else {
duke@435	86	return oldHandler;
duke@435	87	}
duke@435	88	JVM_END
duke@435	89
duke@435	90
duke@435	91	JVM_ENTRY_NO_ENV(jboolean, JVM_RaiseSignal(jint sig))
duke@435	92	if (ReduceSignalUsage) {
duke@435	93	// do not allow SHUTDOWN1_SIGNAL,SHUTDOWN2_SIGNAL,SHUTDOWN3_SIGNAL,
duke@435	94	// BREAK_SIGNAL to be raised when ReduceSignalUsage is set, since
duke@435	95	// no handler for them is actually registered in JVM or via
duke@435	96	// JVM_RegisterSignal.
duke@435	97	if (sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
duke@435	98	sig == SHUTDOWN3_SIGNAL || sig == BREAK_SIGNAL) {
duke@435	99	return JNI_FALSE;
duke@435	100	}
duke@435	101	}
duke@435	102	else if ((sig == SHUTDOWN1_SIGNAL || sig == SHUTDOWN2_SIGNAL ||
duke@435	103	sig == SHUTDOWN3_SIGNAL) && os::Linux::is_sig_ignored(sig)) {
duke@435	104	// do not allow SHUTDOWN1_SIGNAL to be raised when SHUTDOWN1_SIGNAL
duke@435	105	// is ignored, since no handler for them is actually registered in JVM
duke@435	106	// or via JVM_RegisterSignal.
duke@435	107	// This also applies for SHUTDOWN2_SIGNAL and SHUTDOWN3_SIGNAL
duke@435	108	return JNI_FALSE;
duke@435	109	}
duke@435	110
duke@435	111	os::signal_raise(sig);
duke@435	112	return JNI_TRUE;
duke@435	113	JVM_END
duke@435	114
duke@435	115	/*
duke@435	116	All the defined signal names for Linux.
duke@435	117
duke@435	118	NOTE that not all of these names are accepted by our Java implementation
duke@435	119
duke@435	120	Via an existing claim by the VM, sigaction restrictions, or
duke@435	121	the "rules of Unix" some of these names will be rejected at runtime.
duke@435	122	For example the VM sets up to handle USR1, sigaction returns EINVAL for
duke@435	123	STOP, and Linux simply doesn't allow catching of KILL.
duke@435	124
duke@435	125	Here are the names currently accepted by a user of sun.misc.Signal with
duke@435	126	1.4.1 (ignoring potential interaction with use of chaining, etc):
duke@435	127
duke@435	128	HUP, INT, TRAP, ABRT, IOT, BUS, USR2, PIPE, ALRM, TERM, STKFLT,
duke@435	129	CLD, CHLD, CONT, TSTP, TTIN, TTOU, URG, XCPU, XFSZ, VTALRM, PROF,
duke@435	130	WINCH, POLL, IO, PWR, SYS
duke@435	131
duke@435	132	*/
duke@435	133
duke@435	134	struct siglabel {
xlu@634	135	const char *name;
duke@435	136	int number;
duke@435	137	};
duke@435	138
duke@435	139	struct siglabel siglabels[] = {
duke@435	140	/* derived from /usr/include/bits/signum.h on RH7.2 */
duke@435	141	"HUP", SIGHUP, /* Hangup (POSIX). */
duke@435	142	"INT", SIGINT, /* Interrupt (ANSI). */
duke@435	143	"QUIT", SIGQUIT, /* Quit (POSIX). */
duke@435	144	"ILL", SIGILL, /* Illegal instruction (ANSI). */
duke@435	145	"TRAP", SIGTRAP, /* Trace trap (POSIX). */
duke@435	146	"ABRT", SIGABRT, /* Abort (ANSI). */
duke@435	147	"IOT", SIGIOT, /* IOT trap (4.2 BSD). */
duke@435	148	"BUS", SIGBUS, /* BUS error (4.2 BSD). */
duke@435	149	"FPE", SIGFPE, /* Floating-point exception (ANSI). */
duke@435	150	"KILL", SIGKILL, /* Kill, unblockable (POSIX). */
duke@435	151	"USR1", SIGUSR1, /* User-defined signal 1 (POSIX). */
duke@435	152	"SEGV", SIGSEGV, /* Segmentation violation (ANSI). */
duke@435	153	"USR2", SIGUSR2, /* User-defined signal 2 (POSIX). */
duke@435	154	"PIPE", SIGPIPE, /* Broken pipe (POSIX). */
duke@435	155	"ALRM", SIGALRM, /* Alarm clock (POSIX). */
duke@435	156	"TERM", SIGTERM, /* Termination (ANSI). */
duke@435	157	#ifdef SIGSTKFLT
duke@435	158	"STKFLT", SIGSTKFLT, /* Stack fault. */
duke@435	159	#endif
duke@435	160	"CLD", SIGCLD, /* Same as SIGCHLD (System V). */
duke@435	161	"CHLD", SIGCHLD, /* Child status has changed (POSIX). */
duke@435	162	"CONT", SIGCONT, /* Continue (POSIX). */
duke@435	163	"STOP", SIGSTOP, /* Stop, unblockable (POSIX). */
duke@435	164	"TSTP", SIGTSTP, /* Keyboard stop (POSIX). */
duke@435	165	"TTIN", SIGTTIN, /* Background read from tty (POSIX). */
duke@435	166	"TTOU", SIGTTOU, /* Background write to tty (POSIX). */
duke@435	167	"URG", SIGURG, /* Urgent condition on socket (4.2 BSD). */
duke@435	168	"XCPU", SIGXCPU, /* CPU limit exceeded (4.2 BSD). */
duke@435	169	"XFSZ", SIGXFSZ, /* File size limit exceeded (4.2 BSD). */
duke@435	170	"VTALRM", SIGVTALRM, /* Virtual alarm clock (4.2 BSD). */
duke@435	171	"PROF", SIGPROF, /* Profiling alarm clock (4.2 BSD). */
duke@435	172	"WINCH", SIGWINCH, /* Window size change (4.3 BSD, Sun). */
duke@435	173	"POLL", SIGPOLL, /* Pollable event occurred (System V). */
duke@435	174	"IO", SIGIO, /* I/O now possible (4.2 BSD). */
duke@435	175	"PWR", SIGPWR, /* Power failure restart (System V). */
duke@435	176	#ifdef SIGSYS
duke@435	177	"SYS", SIGSYS /* Bad system call. Only on some Linuxen! */
duke@435	178	#endif
duke@435	179	};
duke@435	180
duke@435	181	JVM_ENTRY_NO_ENV(jint, JVM_FindSignal(const char *name))
duke@435	182
duke@435	183	/* find and return the named signal's number */
duke@435	184
duke@435	185	for(uint i=0; i<ARRAY_SIZE(siglabels); i++)
duke@435	186	if(!strcmp(name, siglabels[i].name))
duke@435	187	return siglabels[i].number;
duke@435	188
duke@435	189	return -1;
duke@435	190
duke@435	191	JVM_END
duke@435	192
duke@435	193	// used by os::exception_name()
duke@435	194	extern bool signal_name(int signo, char* buf, size_t len) {
duke@435	195	for(uint i = 0; i < ARRAY_SIZE(siglabels); i++) {
duke@435	196	if (signo == siglabels[i].number) {
duke@435	197	jio_snprintf(buf, len, "SIG%s", siglabels[i].name);
duke@435	198	return true;
duke@435	199	}
duke@435	200	}
duke@435	201	return false;
duke@435	202	}