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Example: file attributes of symlinks et.al
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,4 @@ | ||
| cc_binary( | ||
| name = "opensym", | ||
| srcs = ["opensym.cc"], | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| Contents: | ||
|
|
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| ``` | ||
| 2019-01-14 15:28 66 BUILD | ||
| 2019-01-14 15:39 <SYMLINKD> dir.dangl [hello] | ||
| 2019-01-14 14:33 <DIR> examples | ||
| 2019-01-14 15:39 <SYMLINK> file.dangl [hello] | ||
| 2019-01-14 15:25 <SYMLINKD> foo.dir [examples\py_native] | ||
| 2019-01-14 15:25 <SYMLINKD> foo.dir.bad [examples\py_native\bin.py] | ||
| 2019-01-14 14:35 <SYMLINK> foo.sym [examples\py_native\bin.py] | ||
| 2019-01-14 15:26 <SYMLINK> foo.sym.bad [examples\py_native] | ||
| 2019-01-14 15:48 <JUNCTION> junc [D:\src\tmp\examples] | ||
| 2019-01-14 15:38 <JUNCTION> junc.dangl [D:\src\tmp\hello] | ||
| 2019-01-14 15:49 <JUNCTION> junc.file [D:\src\tmp\BUILD] | ||
| ``` | ||
|
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||
| CreateFileW and attributes: | ||
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| - open1: CreateFileW with `FILE_FLAG_BACKUP_SEMANTICS` (follows reparse points) | ||
| - open2: CreateFileW with `FILE_ATTRIBUTE_NORMAL` | ||
|
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| ``` | ||
| \\?\D:\src\tmp\BUILD (regular file) | ||
| open1: succeeded, attr: 0x00000020, info.attr: 0x00000020, is_dir: 0 | ||
| open2: succeeded, attr: 0x00000020, info.attr: 0x00000020, is_dir: 0 | ||
| \\?\D:\src\tmp\examples (directory) | ||
| open1: succeeded, attr: 0x00000010, info.attr: 0x00000010, is_dir: 1 | ||
| open2: failed, error: 5 | ||
| \\?\D:\src\tmp\junc (junction) | ||
| open1: succeeded, attr: 0x00000410, info.attr: 0x00000010, is_dir: 1 | ||
| open2: failed, error: 5 | ||
| \\?\D:\src\tmp\foo.sym (file symlink) | ||
| open1: succeeded, attr: 0x00000420, info.attr: 0x00000020, is_dir: 0 | ||
| open2: succeeded, attr: 0x00000420, info.attr: 0x00000020, is_dir: 0 | ||
| \\?\D:\src\tmp\foo.dir (directory symlink) | ||
| open1: succeeded, attr: 0x00000410, info.attr: 0x00000010, is_dir: 1 | ||
| open2: failed, error: 5 | ||
| \\?\D:\src\tmp\foo.sym.bad (file symlink pointing to directory) | ||
| open1: succeeded, attr: 0x00000420, info.attr: 0x00000010, is_dir: 1 | ||
| open2: failed, error: 5 | ||
| \\?\D:\src\tmp\foo.dir.bad (directory symlink pointing to file) | ||
| open1: succeeded, attr: 0x00000410, info.attr: 0x00000020, is_dir: 0 | ||
| open2: failed, error: 5 | ||
| \\?\D:\src\tmp\junc.dangl (dangling junction) | ||
| open1: failed, error: 2 | ||
| open2: failed, error: 5 | ||
| \\?\D:\src\tmp\file.dangl (dangling file symlink) | ||
| open1: failed, error: 2 | ||
| open2: failed, error: 2 | ||
| \\?\D:\src\tmp\dir.dangl (dangling directory symlink) | ||
| open1: failed, error: 2 | ||
| open2: failed, error: 5 | ||
| \\?\D:\src\tmp\junc.file (junction pointing to file) | ||
| open1: succeeded, attr: 0x00000410, info.attr: 0x00000020, is_dir: 0 | ||
| open2: failed, error: 5 | ||
| ``` |
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| #include <windows.h> | ||
| #include <stdio.h> | ||
| #include <vector> | ||
|
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| int main(void) { | ||
| static constexpr DWORD kAllShare = | ||
| FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE; | ||
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| for (const wchar_t* path : { | ||
| L"\\\\?\\D:\\src\\tmp\\BUILD", | ||
| L"\\\\?\\D:\\src\\tmp\\examples", | ||
| L"\\\\?\\D:\\src\\tmp\\junc", | ||
| L"\\\\?\\D:\\src\\tmp\\foo.sym", | ||
| L"\\\\?\\D:\\src\\tmp\\foo.dir", | ||
| L"\\\\?\\D:\\src\\tmp\\foo.sym.bad", | ||
| L"\\\\?\\D:\\src\\tmp\\foo.dir.bad", | ||
| L"\\\\?\\D:\\src\\tmp\\junc.dangl", | ||
| L"\\\\?\\D:\\src\\tmp\\file.dangl", | ||
| L"\\\\?\\D:\\src\\tmp\\dir.dangl", | ||
| L"\\\\?\\D:\\src\\tmp\\junc.file", | ||
| }) { | ||
| wprintf(L"%s\n", path); | ||
|
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| HANDLE h = CreateFileW(path, 0, kAllShare, NULL, OPEN_EXISTING, | ||
| FILE_FLAG_BACKUP_SEMANTICS, NULL); | ||
| if (h == INVALID_HANDLE_VALUE) { | ||
| printf(" open1: failed, error: %d\n", GetLastError()); | ||
| } else { | ||
| BY_HANDLE_FILE_INFORMATION info; | ||
| GetFileInformationByHandle(h, &info); | ||
| printf(" open1: succeeded, attr: 0x%08x, info.attr: 0x%08x, is_dir: %d\n", | ||
| GetFileAttributesW(path), | ||
| info.dwFileAttributes, | ||
| info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY ? 1 : 0); | ||
| CloseHandle(h); | ||
| } | ||
|
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| h = CreateFileW(path, 0, kAllShare, NULL, OPEN_EXISTING, | ||
| FILE_ATTRIBUTE_NORMAL, NULL); | ||
| if (h == INVALID_HANDLE_VALUE) { | ||
| printf(" open2: failed, error: %d\n", GetLastError()); | ||
| } else { | ||
| BY_HANDLE_FILE_INFORMATION info; | ||
| GetFileInformationByHandle(h, &info); | ||
| printf(" open2: succeeded, attr: 0x%08x, info.attr: 0x%08x, is_dir: %d\n", | ||
| GetFileAttributesW(path), | ||
| info.dwFileAttributes, | ||
| info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY ? 1 : 0); | ||
| CloseHandle(h); | ||
| } | ||
| } | ||
| return 0; | ||
| } |