1 /* 2 * Copyright (C) 2012 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "config.h" 27 #include "DataLog.h" 28 #include <stdarg.h> 29 #include "wtf/FilePrintStream.h" 30 #include "wtf/WTFThreadData.h" 31 #include "wtf/Threading.h" 32 33 #if OS(UNIX) 34 #include <unistd.h> 35 #endif 36 37 #define DATA_LOG_TO_FILE 0 38 39 // Uncomment to force logging to the given file regardless of what the environment variable says. Note that 40 // we will append ".<pid>.txt" where <pid> is the PID. 41 42 // This path won't work on Windows, make sure to change to something like C:\\Users\\<more path>\\log.txt. 43 #define DATA_LOG_FILENAME "/tmp/WTFLog" 44 45 namespace WTF { 46 47 #if USE(PTHREADS) 48 static pthread_once_t initializeLogFileOnceKey = PTHREAD_ONCE_INIT; 49 #endif 50 51 static FilePrintStream* file; 52 53 static void initializeLogFileOnce() 54 { 55 #if DATA_LOG_TO_FILE 56 #ifdef DATA_LOG_FILENAME 57 const char* filename = DATA_LOG_FILENAME; 58 #else 59 const char* filename = getenv("WTF_DATA_LOG_FILENAME"); 60 #endif 61 char actualFilename[1024]; 62 63 snprintf(actualFilename, sizeof(actualFilename), "%s.%d.txt", filename, getpid()); 64 65 if (filename) { 66 file = FilePrintStream::open(actualFilename, "w").leakPtr(); 67 if (!file) 68 fprintf(stderr, "Warning: Could not open log file %s for writing.\n", actualFilename); 69 } 70 #endif // DATA_LOG_TO_FILE 71 if (!file) 72 file = new FilePrintStream(stderr, FilePrintStream::Borrow); 73 74 setvbuf(file->file(), 0, _IONBF, 0); // Prefer unbuffered output, so that we get a full log upon crash or deadlock. 75 } 76 77 static void initializeLogFile() 78 { 79 #if USE(PTHREADS) 80 pthread_once(&initializeLogFileOnceKey, initializeLogFileOnce); 81 #else 82 if (!file) 83 initializeLogFileOnce(); 84 #endif 85 } 86 87 FilePrintStream& dataFile() 88 { 89 initializeLogFile(); 90 return *file; 91 } 92 93 void dataLogFV(const char* format, va_list argList) 94 { 95 dataFile().vprintf(format, argList); 96 } 97 98 void dataLogF(const char* format, ...) 99 { 100 va_list argList; 101 va_start(argList, format); 102 dataLogFV(format, argList); 103 va_end(argList); 104 } 105 106 void dataLogFString(const char* str) 107 { 108 dataFile().printf("%s", str); 109 } 110 111 } // namespace WTF 112 113