例如 _sopen_s 在磁盘空间不够的时候， 宏 errno 就会返回 ENOSPC（28）
MSDN 文档时只提到以下错误码
| errno value | Condition |
|---|---|
| EACCES | The given path is a directory, or the file is read-only, but an open-for-writing operation was attempted. |
| EEXIST | _O_CREAT and _O_EXCL flags were specified, but filename already exists. |
| EINVAL | Invalid oflag, shflag, or pmode argument, or pfh or filename was a null pointer. |
| EMFILE | No more file descriptors available. |
| ENOENT | File or path not found. |