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/*
* Copyright (c) 2008, 2009 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "fault.h"
#include <dlfcn.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include "util.h"
#include "vlog.h"
#define THIS_MODULE VLM_fault
static void
fault_handler(int sig_nr)
{
VLOG_EMER("Caught signal %d.", sig_nr);
log_backtrace();
fflush(stdout);
fflush(stderr);
signal(sig_nr, SIG_DFL);
raise(sig_nr);
}
void
log_backtrace(void)
{
/* During the loop:
frame[0] points to the next frame.
frame[1] points to the return address. */
void **frame;
for (frame = __builtin_frame_address(0);
frame != NULL && frame[0] != NULL;
frame = frame[0]) {
Dl_info addrinfo;
if (!dladdr(frame[1], &addrinfo) || !addrinfo.dli_sname) {
fprintf(stderr, " 0x%08"PRIxPTR"\n", (uintptr_t) frame[1]);
} else {
fprintf(stderr, " 0x%08"PRIxPTR" (%s+0x%x)\n",
(uintptr_t) frame[1], addrinfo.dli_sname,
(char *) frame[1] - (char *) addrinfo.dli_saddr);
}
}
fflush(stderr);
}
void
register_fault_handlers(void)
{
signal(SIGABRT, fault_handler);
signal(SIGBUS, fault_handler);
signal(SIGFPE, fault_handler);
signal(SIGILL, fault_handler);
signal(SIGSEGV, fault_handler);
}
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