2 * Copyright (C) 2012 Apple Inc. All rights reserved.
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29 #include <wtf/Threading.h>
31 #define DATA_LOG_TO_FILE 0
33 // Uncomment to force logging to the given file regardless of what the environment variable says.
34 // #define DATA_LOG_FILENAME "/tmp/WTFLog.txt"
41 static void initializeLogFileOnce()
43 #ifdef DATA_LOG_FILENAME
44 const char* filename = DATA_LOG_FILENAME;
46 const char* filename = getenv("WTF_DATA_LOG_FILENAME");
49 file = fopen(filename, "w");
51 fprintf(stderr, "Warning: Could not open log file %s for writing.\n", filename);
56 setvbuf(file, 0, _IONBF, 0); // Prefer unbuffered output, so that we get a full log upon crash or deadlock.
60 static pthread_once_t initializeLogFileOnceKey = PTHREAD_ONCE_INIT;
63 static void initializeLogFile()
66 pthread_once(&initializeLogFileOnceKey, initializeLogFileOnce);
69 initializeLogFileOnce();
78 #else // DATA_LOG_TO_FILE
83 #endif // DATA_LOG_TO_FILE
85 void dataLogV(const char* format, va_list argList)
87 vfprintf(dataFile(), format, argList);
90 void dataLog(const char* format, ...)
93 va_start(argList, format);
94 dataLogV(format, argList);
98 void dataLogString(const char* str)
100 fputs(str, dataFile());