tensorflow/lite/minimal_logging_ios.cc

/* Copyright 2019 The TensorFlow Authors. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==============================================================================*/

#include <syslog.h>

#include <cstdarg>
#include <cstdio>

#include "tensorflow/lite/minimal_logging.h"

namespace tflite {
namespace logging_internal {
namespace {

int GetPlatformSeverity(LogSeverity severity) {
  switch (severity) {
    case TFLITE_LOG_VERBOSE:
    case TFLITE_LOG_INFO:
      return LOG_INFO;
    case TFLITE_LOG_WARNING:
      return LOG_WARNING;
    case TFLITE_LOG_ERROR:
      return LOG_ERR;
    // LOG_SILENT doesn't exist, Use LOG_DEBUG instead.
    case TFLITE_LOG_SILENT:
    default:
      return LOG_DEBUG;
  }
}

}  // namespace

#ifndef NDEBUG
// In debug builds, default is VERBOSE.
LogSeverity MinimalLogger::minimum_log_severity_ = TFLITE_LOG_VERBOSE;
#else
// In prod builds, default is INFO.
LogSeverity MinimalLogger::minimum_log_severity_ = TFLITE_LOG_INFO;
#endif

void MinimalLogger::LogFormatted(LogSeverity severity, const char* format,
                                 va_list args) {
  if (severity >= MinimalLogger::minimum_log_severity_) {
    // First log to iOS system logging API.
    va_list args_copy;
    va_copy(args_copy, args);
    // TODO(b/123704468): Use os_log when available.
    vsyslog(GetPlatformSeverity(severity), format, args_copy);
    va_end(args_copy);

    // Also print to stderr for standard console applications.
    fprintf(stderr, "%s: ", GetSeverityName(severity));
    va_copy(args_copy, args);
    vfprintf(stderr, format, args_copy);
    va_end(args_copy);
    fputc('\n', stderr);
  }
}

}  // namespace logging_internal
}  // namespace tflite