1 // Copyright 2015 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "chromecast/base/error_codes.h" 6 7 #include <errno.h> 8 #include <fcntl.h> 9 10 #include <string> 11 12 #include "base/files/file_util.h" 13 #include "base/logging.h" 14 #include "base/strings/string_number_conversions.h" 15 #include "chromecast/base/path_utils.h" 16 17 namespace chromecast { 18 19 namespace { 20 21 const char kInitialErrorFile[] = "initial_error"; 22 GetInitialErrorFilePath()23base::FilePath GetInitialErrorFilePath() { 24 return GetHomePathASCII(kInitialErrorFile); 25 } 26 27 } // namespace 28 GetInitialErrorCode()29ErrorCode GetInitialErrorCode() { 30 std::string initial_error_code_str; 31 if (!base::ReadFileToString(GetInitialErrorFilePath(), 32 &initial_error_code_str)) { 33 return NO_ERROR; 34 } 35 36 int initial_error_code = 0; 37 if (base::StringToInt(initial_error_code_str, &initial_error_code) && 38 initial_error_code >= NO_ERROR && initial_error_code <= ERROR_UNKNOWN) { 39 DVLOG(1) << "Initial error from " << GetInitialErrorFilePath().value() 40 << ": " << initial_error_code; 41 return static_cast<ErrorCode>(initial_error_code); 42 } 43 44 LOG(ERROR) << "Unknown initial error code: " << initial_error_code_str; 45 return NO_ERROR; 46 } 47 SetInitialErrorCode(ErrorCode initial_error_code)48bool SetInitialErrorCode(ErrorCode initial_error_code) { 49 // Note: Do not use Chromium IO methods in this function. When cast_shell 50 // crashes, this function can be called by any thread. 51 const std::string error_file_path = GetInitialErrorFilePath().value(); 52 53 if (initial_error_code > NO_ERROR && initial_error_code <= ERROR_UNKNOWN) { 54 const std::string initial_error_code_str( 55 base::NumberToString(initial_error_code)); 56 int fd = creat(error_file_path.c_str(), 0640); 57 if (fd < 0) { 58 PLOG(ERROR) << "Could not open error code file"; 59 return false; 60 } 61 62 int written = 63 write(fd, initial_error_code_str.data(), initial_error_code_str.size()); 64 65 if (written != static_cast<int>(initial_error_code_str.size())) { 66 PLOG(ERROR) << "Could not write error code to file: written=" << written 67 << ", expected=" << initial_error_code_str.size(); 68 close(fd); 69 return false; 70 } 71 72 close(fd); 73 return true; 74 } 75 76 // Remove initial error file if no error. 77 if (unlink(error_file_path.c_str()) == 0 || errno == ENOENT) 78 return true; 79 80 PLOG(ERROR) << "Failed to remove error file"; 81 return false; 82 } 83 84 } // namespace chromecast 85