• file
• revisions
• annotate
• diff
• comparison
• raw

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

src/os/linux/vm/vmError_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 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

Merge

duke@435	1	/*
duke@435	2	* Copyright 2003-2006 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/_vmError_linux.cpp.incl"
duke@435	27
duke@435	28	#include <sys/types.h>
duke@435	29	#include <sys/wait.h>
duke@435	30	#include <sys/syscall.h>
duke@435	31	#include <unistd.h>
duke@435	32	#include <signal.h>
duke@435	33
duke@435	34	void VMError::show_message_box(char *buf, int buflen) {
duke@435	35	bool yes;
duke@435	36	do {
duke@435	37	error_string(buf, buflen);
duke@435	38	int len = (int)strlen(buf);
duke@435	39	char *p = &buf[len];
duke@435	40
duke@435	41	jio_snprintf(p, buflen - len,
duke@435	42	"\n\n"
duke@435	43	"Do you want to debug the problem?\n\n"
duke@435	44	"To debug, run 'gdb /proc/%d/exe %d'; then switch to thread " INTX_FORMAT "\n"
duke@435	45	"Enter 'yes' to launch gdb automatically (PATH must include gdb)\n"
duke@435	46	"Otherwise, press RETURN to abort...",
duke@435	47	os::current_process_id(), os::current_process_id(),
duke@435	48	os::current_thread_id());
duke@435	49
duke@435	50	yes = os::message_box("Unexpected Error", buf);
duke@435	51
duke@435	52	if (yes) {
duke@435	53	// yes, user asked VM to launch debugger
duke@435	54	jio_snprintf(buf, buflen, "gdb /proc/%d/exe %d",
duke@435	55	os::current_process_id(), os::current_process_id());
duke@435	56
duke@435	57	os::fork_and_exec(buf);
duke@435	58	yes = false;
duke@435	59	}
duke@435	60	} while (yes);
duke@435	61	}
duke@435	62
duke@435	63	// Space for our "saved" signal flags and handlers
duke@435	64	static int resettedSigflags[2];
duke@435	65	static address resettedSighandler[2];
duke@435	66
duke@435	67	static void save_signal(int idx, int sig)
duke@435	68	{
duke@435	69	struct sigaction sa;
duke@435	70	sigaction(sig, NULL, &sa);
duke@435	71	resettedSigflags[idx] = sa.sa_flags;
duke@435	72	resettedSighandler[idx] = (sa.sa_flags & SA_SIGINFO)
duke@435	73	? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
duke@435	74	: CAST_FROM_FN_PTR(address, sa.sa_handler);
duke@435	75	}
duke@435	76
duke@435	77	int VMError::get_resetted_sigflags(int sig) {
duke@435	78	if(SIGSEGV == sig) {
duke@435	79	return resettedSigflags[0];
duke@435	80	} else if(SIGBUS == sig) {
duke@435	81	return resettedSigflags[1];
duke@435	82	}
duke@435	83	return -1;
duke@435	84	}
duke@435	85
duke@435	86	address VMError::get_resetted_sighandler(int sig) {
duke@435	87	if(SIGSEGV == sig) {
duke@435	88	return resettedSighandler[0];
duke@435	89	} else if(SIGBUS == sig) {
duke@435	90	return resettedSighandler[1];
duke@435	91	}
duke@435	92	return NULL;
duke@435	93	}
duke@435	94
duke@435	95	static void crash_handler(int sig, siginfo_t* info, void* ucVoid) {
duke@435	96	// unmask current signal
duke@435	97	sigset_t newset;
duke@435	98	sigemptyset(&newset);
duke@435	99	sigaddset(&newset, sig);
duke@435	100	sigprocmask(SIG_UNBLOCK, &newset, NULL);
duke@435	101
duke@435	102	VMError err(NULL, sig, NULL, info, ucVoid);
duke@435	103	err.report_and_die();
duke@435	104	}
duke@435	105
duke@435	106	void VMError::reset_signal_handlers() {
duke@435	107	// Save sigflags for resetted signals
duke@435	108	save_signal(0, SIGSEGV);
duke@435	109	save_signal(1, SIGBUS);
duke@435	110	os::signal(SIGSEGV, CAST_FROM_FN_PTR(void *, crash_handler));
duke@435	111	os::signal(SIGBUS, CAST_FROM_FN_PTR(void *, crash_handler));
duke@435	112	}