Drain buffer content to the specific conduit.
Write as much of the buffer that the associated conduit can consume. The conduit is not obliged to consume all content, so some may remain within the buffer.
the number of bytes written, or Eof.
See Implementation
Drain buffer content to the specific conduit.
Write as much of the buffer that the associated conduit can consume. The conduit is not obliged to consume all content, so some may remain within the buffer.