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/*
* Copyright (c) 2008, 2009, 2010, 2011, 2013 Nicira, Inc.
*
* 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 <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <string.h>
#include <unistd.h>
#include "backtrace.h"
#include "openvswitch/vlog.h"
#include "util.h"
VLOG_DEFINE_THIS_MODULE(backtrace);
#ifdef HAVE_BACKTRACE
#include <execinfo.h>
void
backtrace_capture(struct backtrace *b)
{
void *frames[BACKTRACE_MAX_FRAMES];
int i;
b->n_frames = backtrace(frames, BACKTRACE_MAX_FRAMES);
for (i = 0; i < b->n_frames; i++) {
b->frames[i] = (uintptr_t) frames[i];
}
}
#else
void
backtrace_capture(struct backtrace *backtrace)
{
backtrace->n_frames = 0;
}
#endif
static char *
backtrace_format(const struct backtrace *b, struct ds *ds)
{
if (b->n_frames) {
int i;
ds_put_cstr(ds, " (backtrace:");
for (i = 0; i < b->n_frames; i++) {
ds_put_format(ds, " 0x%08"PRIxPTR, b->frames[i]);
}
ds_put_cstr(ds, ")");
}
return ds_cstr(ds);
}
void
log_backtrace_at(const char *msg, const char *where)
{
struct backtrace b;
struct ds ds = DS_EMPTY_INITIALIZER;
backtrace_capture(&b);
if (msg) {
ds_put_format(&ds, "%s ", msg);
}
ds_put_cstr(&ds, where);
VLOG_ERR("%s", backtrace_format(&b, &ds));
ds_destroy(&ds);
}
#ifdef HAVE_UNWIND
void
log_received_backtrace(int fd) {
int byte_read;
struct unw_backtrace backtrace[UNW_MAX_DEPTH];
VLOG_WARN("%s fd %d", __func__, fd);
fcntl(fd, F_SETFL, O_NONBLOCK);
memset(backtrace, 0, UNW_MAX_BUF);
byte_read = read(fd, backtrace, UNW_MAX_BUF);
if (byte_read < 0) {
VLOG_ERR("Read fd %d failed: %s", fd,
ovs_strerror(errno));
} else if (byte_read > 0) {
VLOG_WARN("SIGSEGV detected, backtrace:");
for (int i = 0; i < UNW_MAX_DEPTH; i++) {
if (backtrace[i].func[0] == 0) {
break;
}
VLOG_WARN("0x%016"PRIxPTR" <%s+0x%"PRIxPTR">\n",
backtrace[i].ip,
backtrace[i].func,
backtrace[i].offset);
}
}
}
#else /* !HAVE_UNWIND */
void
log_received_backtrace(int daemonize_fd OVS_UNUSED) {
VLOG_WARN("Backtrace using libunwind not supported.");
}
#endif /* HAVE_UNWIND */
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