googletest/include/gtest/internal/custom/gtest.h

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// modification, are permitted provided that the following conditions are
// met:
//
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// notice, this list of conditions and the following disclaimer.
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// Injection point for custom user configurations. See README for details
//
// ** Custom implementation starts here **

#ifndef GOOGLETEST_INCLUDE_GTEST_INTERNAL_CUSTOM_GTEST_H_
#define GOOGLETEST_INCLUDE_GTEST_INTERNAL_CUSTOM_GTEST_H_

#if GTEST_OS_LINUX_ANDROID
#include <dlfcn.h>
#include <unistd.h>

#define GTEST_CUSTOM_TEMPDIR_FUNCTION_ GetAndroidTempDir
#define GTEST_CUSTOM_INIT_GOOGLE_TEST_FUNCTION_(argc, argv) \
  internal::InitGoogleTestImpl(argc, argv);                 \
  SetAndroidTestLogger()

static inline std::string GetAndroidTempDir() {
  // Android doesn't have /tmp, and /sdcard is no longer accessible from
  // an app context starting from Android O. On Android, /data/local/tmp
  // is usually used as the temporary directory, so try that first...
  if (access("/data/local/tmp", R_OK | W_OK | X_OK) == 0) {
    return "/data/local/tmp/";
  }

  // Processes running in an app context can't write to /data/local/tmp,
  // so fall back to the current directory...
  std::string result = "./";
  char* cwd = getcwd(NULL, 0);
  if (cwd != NULL) {
    result = cwd;
    result += "/";
    free(cwd);
  }
  return result;
}

static inline void SetAndroidTestLogger() {
  // By default, Android log messages are only written to the log buffer, where
  // GTest cannot see them. This breaks death tests, which need to check the
  // crash message to ensure that the process died for the expected reason.
  // To fix this, send log messages to both logd and stderr if we are in a death
  // test child process.
  struct LogMessage;
  using LoggerFunction = void (*)(const LogMessage*);
  using SetLoggerFunction = void (*)(LoggerFunction logger);

  static void* liblog = dlopen("liblog.so", RTLD_NOW);
  if (liblog == nullptr) {
    return;
  }

  static SetLoggerFunction set_logger = reinterpret_cast<SetLoggerFunction>(
      dlsym(liblog, "__android_log_set_logger"));
  static LoggerFunction logd_logger = reinterpret_cast<LoggerFunction>(
      dlsym(liblog, "__android_log_logd_logger"));
  static LoggerFunction stderr_logger = reinterpret_cast<LoggerFunction>(
      dlsym(liblog, "__android_log_stderr_logger"));
  if (set_logger == nullptr || logd_logger == nullptr ||
      stderr_logger == nullptr) {
    return;
  }

  set_logger([](const LogMessage* message) {
    logd_logger(message);
    if (::testing::internal::InDeathTestChild()) {
      stderr_logger(message);
    }
  });
}
#endif  // GTEST_OS_LINUX_ANDROID

#endif  // GOOGLETEST_INCLUDE_GTEST_INTERNAL_CUSTOM_GTEST_H_