snd_ump_transmit(9)

💅 snd_ump_transmit(9) 💅

okay so bestie, welcome to snd_ump_transmit(9) — this is the kernel API manual page for it, and ngl it's a tiny little function that does exactly one job and does it slayfully.

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✨ NAME ✨

snd_ump_transmit — transmit UMP packets 🎀

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🌸 SYNOPSIS 🌸

int snd_ump_transmit (struct snd_ump_endpoint *ump , u32 *buffer , int count );

that's the whole signature, copy it exactly bestie, no cap 🫶

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🦋 ARGUMENTS 🦋

• ump — the UMP endpoint. like, the actual thing you're talking to 💖
• buffer — the buffer pointer to transfer. it's giving "here's the data, go off" ✨
• count — byte size to transfer. how many bytes, literally 🎀

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💜 DESCRIPTION 💜

so this one gets called from the driver, and its whole main character energy is to obtain the UMP packets from user-space and hand them over to the device. it's essentially a wrapper of rawmidi_transmit — that's it, that's the vibe, it's just channelling the rawmidi energy through 💅

one thing to clock: the data to transmit is in CPU-native endianness. not saying it's a big deal, just saying iykyk 🌈

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👑 SEE ALSO 👑

• Kernel file ./sound/core/ump.c 📁
• snd_ump_endpoint_new(9)
• snd_ump_receive_ump_val(9)
• snd_ump_receive(9)
• snd_ump_block_new(9)
• snd_ump_switch_protocol(9)
• snd_ump_parse_endpoint(9)

go read those too, they're all iconc fr fr 🦋

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ngl there's no OPTIONS, no RETURN VALUE, no ERRORS section on this one — the page is short and we're keeping every single crumb of it, no summarizing, periodt 🔥

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and that's a wrap! this lil page lives in ./sound/core, it's dated October 2026, and the whole thing is filed under snd_ump_transmit(9) 🧚💖 bye bestie, happy transmitting! ⭐