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log_backtrace() and log_backtrace_msg() logs the back trace into the log file. It may be most useful when debugging unit tests. "backtrace.h" documents the usage. It is not being called directly in the code, but rather as a handy tool available when needed. Signed-off-by: Andy Zhou <azhou@nicira.com> Acked-by: Ben Pfaff <blp@nicira.com>
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010, 2011, 2013 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <config.h>
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#include <inttypes.h>
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#include "backtrace.h"
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#include "vlog.h"
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VLOG_DEFINE_THIS_MODULE(backtrace);
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#ifdef HAVE_BACKTRACE
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#include <execinfo.h>
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void
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backtrace_capture(struct backtrace *b)
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{
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void *frames[BACKTRACE_MAX_FRAMES];
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int i;
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b->n_frames = backtrace(frames, BACKTRACE_MAX_FRAMES);
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for (i = 0; i < b->n_frames; i++) {
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b->frames[i] = (uintptr_t) frames[i];
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}
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}
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#else
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void
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backtrace_capture(struct backtrace *backtrace)
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{
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backtrace->n_frames = 0;
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}
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#endif
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static char *
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backtrace_format(const struct backtrace *b, struct ds *ds)
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{
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if (b->n_frames) {
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int i;
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ds_put_cstr(ds, " (backtrace:");
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for (i = 0; i < b->n_frames; i++) {
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ds_put_format(ds, " 0x%08"PRIxPTR, b->frames[i]);
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}
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ds_put_cstr(ds, ")");
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}
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return ds_cstr(ds);
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}
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void
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log_backtrace_at(const char *msg, const char *where)
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{
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struct backtrace b;
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struct ds ds = DS_EMPTY_INITIALIZER;
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backtrace_capture(&b);
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if (msg) {
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ds_put_format(&ds, "%s ", msg);
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}
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ds_put_cstr(&ds, where);
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VLOG_ERR("%s", backtrace_format(&b, &ds));
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ds_destroy(&ds);
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}
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