snd_rawmidi_transmit_peek(9)

✨ snd_rawmidi_transmit_peek(9) ✨

okay so bestie, we're in the Kernel API Manual today and this one is a little function with main character energy — it's snd_rawmidi_transmit_peek, and yes the name sounds like it's snooping but it's actually very well-behaved 🎀

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💖 NAME 💖

snd_rawmidi_transmit_peek — literally just copying data out of the internal buffer, that's the whole vibe 🦋

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🌸 SYNOPSIS 🌸

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

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🎀 ARGUMENTS 🎀

• substream — the rawmidi substream, your lil guy, the whole reason we're here 💅
• buffer — the buffer pointer. yeah. that one. the destination 🫶
• count — how much data we're transferring, size-wise ⭐

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🦋 DESCRIPTION 🦋

So what it does: it copies data from the internal output buffer over to the buffer you handed it. Peek, copy, done — no cap 💖

And here's the important part, the part you cannot skip: call this in the interrupt handler when the midi output is ready. Then, once the transmission is actually finished, call snd_rawmidi_transmit_ack. That's the order, bestie — peek first, ack after, periodt 👑

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✨ RETURN ✨

It returns the size of the copied data 🍓 — or a negative error code if something went wrong 😭

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🌈 SEE ALSO 🌈

Kernel file ./sound/core/rawmidi.c, plus the whole friend group:

• snd_rawmidi_receive(9)
• snd_rawmidi_transmit_empty(9)
• snd_rawmidi_transmit_ack(9)
• snd_rawmidi_transmit(9)
• snd_rawmidi_proceed(9)
• snd_rawmidi_new(9)
• snd_rawmidi_set_ops(9)

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and that's the page!! 🧚 this lil cutie lives over in ./sound/core, it's dated October 2026, and it will forever answer to the name snd_rawmidi_transmit_peek(9). mwah 💋 go peek responsibly 💜