snd_rawmidi_transmit_peek (9)

int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream * substream, unsigned char * buffer, int count);

substream

the rawmidi substream

buffer

the buffer pointer

count

data size to transfer

Copies data from the internal output buffer to the given buffer.

Call this in the interrupt handler when the midi output is ready, and call snd_rawmidi_transmit_ack after the transmission is finished.

The size of copied data, or a negative error code on failure.