Adding crash utilities to chromecast/crash.

chromecast/base/error_codes.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chromecast/base/error_codes.h"
+
+#include <fcntl.h>
+
+#include <string>
+
+#include "base/files/file_util.h"
+#include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
+#include "chromecast/base/path_utils.h"
+
+namespace chromecast {
+
+namespace {
+
+const char kInitialErrorFile[] = "initial_error";
+
+base::FilePath GetInitialErrorFilePath() {
+  return GetHomePathASCII(kInitialErrorFile);
+}
+
+}  // namespace
+
+ErrorCode GetInitialErrorCode() {
+  std::string initial_error_code_str;
+  if (!base::ReadFileToString(GetInitialErrorFilePath(),
+                              &initial_error_code_str)) {
+    return NO_ERROR;
+  }
+
+  int initial_error_code = 0;
+  if (base::StringToInt(initial_error_code_str, &initial_error_code) &&
+      initial_error_code >= NO_ERROR && initial_error_code <= ERROR_UNKNOWN) {
+    VLOG(1) << "Initial error from " << GetInitialErrorFilePath().value()
+            << ": " << initial_error_code;
+    return static_cast<ErrorCode>(initial_error_code);
+  }
+
+  LOG(ERROR) << "Unknown initial error code: " << initial_error_code_str;
+  return NO_ERROR;
+}
+
+bool SetInitialErrorCode(ErrorCode initial_error_code) {
+  // Note: Do not use Chromium IO methods in this function. When cast_shell
+  // crashes, this function can be called by any thread.
+  const std::string& error_file_path = GetInitialErrorFilePath().value();
+
+  if (initial_error_code > NO_ERROR && initial_error_code <= ERROR_UNKNOWN) {
+    const std::string initial_error_code_str(
+        base::IntToString(initial_error_code));
+    int fd = creat(error_file_path.c_str(), 0640);
+    if (fd < 0) {
+      LOG(ERROR) << "Could not open error code file";
+      return false;
+    }
+
+    int written =
+        write(fd, initial_error_code_str.data(), initial_error_code_str.size());
+    close(fd);
+
+    if (written != static_cast<int>(initial_error_code_str.size())) {
+      LOG(ERROR) << "Could not write error code to file";
+      return false;
+    }
+
+    return true;
+  }
+
+  // Remove initial error file if no error.
+  if (unlink(error_file_path.c_str()) == 0 || errno == ENOENT)
+    return true;
+
+  LOG(ERROR) << "Failed to remove error file";
+  return false;
+}
+
+}  // namespace chromecast