dio_truncate -- Truncates file descriptor fd to offset bytes
說明
bool dio_truncate ( resource fd, int offset )
dio_truncate() truncates a file to at most offset bytes in size.
If the file previously was larger than this size, the extra data is LOST. If the file previously was shorter, it is unspecified whether the file is left unchanged or is extended. In the latter case the extended part reads as zero bytes.
注意: 本函式未在 Windows 平台下實現。
參數
fd
The file descriptor returned by dio_open().
offset
The offset in bytes.
