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/*
* Copyright (C) 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "DataLog.h"
#include <stdarg.h>
#include <wtf/Threading.h>
#define DATA_LOG_TO_FILE 0
// Uncomment to force logging to the given file regardless of what the environment variable says.
// #define DATA_LOG_FILENAME "/tmp/WTFLog.txt"
namespace WTF {
#if DATA_LOG_TO_FILE
static FILE* file;
static void initializeLogFileOnce()
{
#ifdef DATA_LOG_FILENAME
const char* filename = DATA_LOG_FILENAME
#else
const char* filename = getenv("WTF_DATA_LOG_FILENAME");
#endif
if (filename) {
file = fopen(filename, "w");
if (!file)
fprintf(stderr, "Warning: Could not open log file %s for writing.\n", filename);
}
if (!file)
file = stderr;
setvbuf(file, 0, _IONBF, 0); // Prefer unbuffered output, so that we get a full log upon crash or deadlock.
}
#if OS(DARWIN)
static pthread_once_t initializeLogFileOnceKey = PTHREAD_ONCE_INIT;
#endif
static void initializeLogFile()
{
#if OS(DARWIN)
pthread_once(&initializeLogFileOnceKey, initializeLogFileOnce);
#else
if (!file)
initializeLogFileOnce();
#endif
}
FILE* dataFile()
{
initializeLogFile();
return file;
}
#else // DATA_LOG_TO_FILE
FILE* dataFile()
{
return stderr;
}
#endif // DATA_LOG_TO_FILE
void dataLogV(const char* format, va_list argList)
{
vfprintf(dataFile(), format, argList);
}
void dataLog(const char* format, ...)
{
va_list argList;
va_start(argList, format);
dataLogV(format, argList);
va_end(argList);
}
} // namespace WTF
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