1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include <__config> 10 #include <cstdint> 11 #include <filesystem> 12 #include <system_error> 13 14 #include "file_descriptor.h" 15 #include "posix_compat.h" 16 #include "time_utils.h" 17 18 _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM 19 20 error_code directory_entry::__do_refresh() noexcept { 21 __data_.__reset(); 22 error_code failure_ec; 23 24 detail::StatT full_st; 25 file_status st = detail::posix_lstat(__p_, full_st, &failure_ec); 26 if (!status_known(st)) { 27 __data_.__reset(); 28 return failure_ec; 29 } 30 31 if (!filesystem::exists(st) || !filesystem::is_symlink(st)) { 32 __data_.__cache_type_ = directory_entry::_RefreshNonSymlink; 33 __data_.__type_ = st.type(); 34 __data_.__non_sym_perms_ = st.permissions(); 35 } else { // we have a symlink 36 __data_.__sym_perms_ = st.permissions(); 37 // Get the information about the linked entity. 38 // Ignore errors from stat, since we don't want errors regarding symlink 39 // resolution to be reported to the user. 40 error_code ignored_ec; 41 st = detail::posix_stat(__p_, full_st, &ignored_ec); 42 43 __data_.__type_ = st.type(); 44 __data_.__non_sym_perms_ = st.permissions(); 45 46 // If we failed to resolve the link, then only partially populate the 47 // cache. 48 if (!status_known(st)) { 49 __data_.__cache_type_ = directory_entry::_RefreshSymlinkUnresolved; 50 return error_code{}; 51 } 52 // Otherwise, we resolved the link, potentially as not existing. 53 // That's OK. 54 __data_.__cache_type_ = directory_entry::_RefreshSymlink; 55 } 56 57 if (filesystem::is_regular_file(st)) 58 __data_.__size_ = static_cast<uintmax_t>(full_st.st_size); 59 60 if (filesystem::exists(st)) { 61 __data_.__nlink_ = static_cast<uintmax_t>(full_st.st_nlink); 62 63 // Attempt to extract the mtime, and fail if it's not representable using 64 // file_time_type. For now we ignore the error, as we'll report it when 65 // the value is actually used. 66 error_code ignored_ec; 67 __data_.__write_time_ = detail::__extract_last_write_time(__p_, full_st, &ignored_ec); 68 } 69 70 return failure_ec; 71 } 72 73 _LIBCPP_END_NAMESPACE_FILESYSTEM 74