Constants
| FXP_INIT | = | 1 |
| FXP_VERSION | = | 2 |
| FXP_OPEN | = | 3 |
| FXP_CLOSE | = | 4 |
| FXP_READ | = | 5 |
| FXP_WRITE | = | 6 |
| FXP_LSTAT | = | 7 |
| FXP_FSTAT | = | 8 |
| FXP_SETSTAT | = | 9 |
| FXP_FSETSTAT | = | 10 |
| FXP_OPENDIR | = | 11 |
| FXP_READDIR | = | 12 |
| FXP_REMOVE | = | 13 |
| FXP_MKDIR | = | 14 |
| FXP_RMDIR | = | 15 |
| FXP_REALPATH | = | 16 |
| FXP_STAT | = | 17 |
| FXP_RENAME | = | 18 |
| FXP_READLINK | = | 19 |
| FXP_SYMLINK | = | 20 |
| FXP_STATUS | = | 101 |
| FXP_HANDLE | = | 102 |
| FXP_DATA | = | 103 |
| FXP_NAME | = | 104 |
| FXP_ATTRS | = | 105 |
| FXP_EXTENDED | = | 106 |
| FXP_EXTENDED_REPLY | = | 107 |
| FXP_RENAME_OVERWRITE | = | 0x00000001 |
| FXP_RENAME_ATOMIC | = | 0x00000002 |
| FXP_RENAME_NATIVE | = | 0x00000004 |
| FX_OK | = | 0 |
| FX_EOF | = | 1 |