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
29#if OS(POSIX)
30#include <pthread.h>
31#include <unistd.h>
32#endif
33
34#define DATA_LOG_TO_FILE 0
35
36// Uncomment to force logging to the given file regardless of what the environment variable says. Note that
37// we will append ".<pid>.txt" where <pid> is the PID.
38
39// This path won't work on Windows, make sure to change to something like C:\\Users\\<more path>\\log.txt.
40#define DATA_LOG_FILENAME "/tmp/WTFLog"
41
42namespace WTF {
43
44#if USE(PTHREADS)
45static pthread_once_t initializeLogFileOnceKey = PTHREAD_ONCE_INIT;
46#endif
47
48static FilePrintStream* file;
49
50static void initializeLogFileOnce()
51{
52#if DATA_LOG_TO_FILE
53#ifdef DATA_LOG_FILENAME
54    const char* filename = DATA_LOG_FILENAME;
55#else
56    const char* filename = getenv("WTF_DATA_LOG_FILENAME");
57#endif
58    char actualFilename[1024];
59
60    snprintf(actualFilename, sizeof(actualFilename), "%s.%d.txt", filename, getpid());
61
62    if (filename) {
63        file = FilePrintStream::open(actualFilename, "w").leakPtr();
64        if (!file)
65            fprintf(stderr, "Warning: Could not open log file %s for writing.\n", actualFilename);
66    }
67#endif // DATA_LOG_TO_FILE
68    if (!file)
69        file = new FilePrintStream(stderr, FilePrintStream::Borrow);
70
71    setvbuf(file->file(), 0, _IONBF, 0); // Prefer unbuffered output, so that we get a full log upon crash or deadlock.
72}
73
74static void initializeLogFile()
75{
76#if USE(PTHREADS)
77    pthread_once(&initializeLogFileOnceKey, initializeLogFileOnce);
78#else
79    if (!file)
80        initializeLogFileOnce();
81#endif
82}
83
84FilePrintStream& dataFile()
85{
86    initializeLogFile();
87    return *file;
88}
89
90void dataLogFV(const char* format, va_list argList)
91{
92    dataFile().vprintf(format, argList);
93}
94
95void dataLogF(const char* format, ...)
96{
97    va_list argList;
98    va_start(argList, format);
99    dataLogFV(format, argList);
100    va_end(argList);
101}
102
103void dataLogFString(const char* str)
104{
105    dataFile().printf("%s", str);
106}
107
108} // namespace WTF
109
110