Line data    Source code

       1             : // Copyright (c) 2012 Google Inc.
       2             : // 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 are
       6             : // met:
       7             : //
       8             : //     * Redistributions of source code must retain the above copyright
       9             : // notice, this list of conditions and the following disclaimer.
      10             : //     * Redistributions in binary form must reproduce the above
      11             : // copyright notice, this list of conditions and the following disclaimer
      12             : // in the documentation and/or other materials provided with the
      13             : // distribution.
      14             : //     * Neither the name of Google Inc. nor the names of its
      15             : // contributors may be used to endorse or promote products derived from
      16             : // this software without specific prior written permission.
      17             : //
      18             : // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      19             : // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      20             : // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      21             : // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      22             : // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      23             : // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      24             : // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      25             : // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      26             : // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      27             : // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      28             : // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      29             : 
      30             : #include "linux/log/log.h"
      31             : 
      32             : #if defined(__ANDROID__)
      33             : #include <android/log.h>
      34             : #include <dlfcn.h>
      35             : #else
      36             : #include "third_party/lss/linux_syscall_support.h"
      37             : #endif
      38             : 
      39             : namespace logger {
      40             : 
      41             : #if defined(__ANDROID__)
      42             : namespace {
      43             : 
      44             : // __android_log_buf_write() is not exported in the NDK and is being used by
      45             : // dynamic runtime linking. Its declaration is taken from Android's
      46             : // system/core/include/log/log.h.
      47             : using AndroidLogBufferWriteFunc = int (*)(int bufID, int prio, const char *tag,
      48             :                                           const char *text);
      49             : const int kAndroidCrashLogId = 4;  // From LOG_ID_CRASH in log.h.
      50             : const char kAndroidLogTag[] = "google-breakpad";
      51             : 
      52             : bool g_crash_log_initialized = false;
      53             : AndroidLogBufferWriteFunc g_android_log_buf_write = nullptr;
      54             : 
      55             : }  // namespace
      56             : 
      57             : void initializeCrashLogWriter() {
      58             :   if (g_crash_log_initialized)
      59             :     return;
      60             :   g_android_log_buf_write = reinterpret_cast<AndroidLogBufferWriteFunc>(
      61             :       dlsym(RTLD_DEFAULT, "__android_log_buf_write"));
      62             :   g_crash_log_initialized = true;
      63             : }
      64             : 
      65             : int writeToCrashLog(const char* buf) {
      66             :   // Try writing to the crash log ring buffer. If not available, fall back to
      67             :   // the standard log buffer.
      68             :   if (g_android_log_buf_write) {
      69             :     return g_android_log_buf_write(kAndroidCrashLogId, ANDROID_LOG_FATAL,
      70             :                                    kAndroidLogTag, buf);
      71             :   }
      72             :   return __android_log_write(ANDROID_LOG_FATAL, kAndroidLogTag, buf);
      73             : }
      74             : #endif
      75             : 
      76           0 : int write(const char* buf, size_t nbytes) {
      77             : #if defined(__ANDROID__)
      78             :   return __android_log_write(ANDROID_LOG_WARN, kAndroidLogTag, buf);
      79             : #else
      80           0 :   return sys_write(2, buf, nbytes);
      81             : #endif
      82             : }
      83             : 
      84             : }  // namespace logger