インテル® Fortran コンパイラー 19.0 デベロッパー・ガイドおよびリファレンス
The BUFFERED specifier asks whether run-time buffering is in effect. It takes the following form:
BUFFERED = bf
bf
Is a scalar default character variable that is assigned one of the following values:
'NO'
If the file or unit is connected and buffering is not in effect.
'YES'
If the file or unit is connected and buffering is in effect.
'UNKNOWN'
If the file or unit is not connected.