comedi_buf_write_alloc(9)

✨ comedi_buf_write_alloc(9) ✨

okay bestie, welcome to the Kernel API Manual 💖 this one is a tiny little function with a big job and honestly? it ate.

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🌸 NAME 🌸

comedi_buf_write_alloc — the one that reserves buffer space for writing 🎀

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🦋 SYNOPSIS 🦋

unsigned int comedi_buf_write_alloc (struct comedi_subdevice *s ,
unsigned int nbytes );

like, look at her. iconic signature. no notes. 👑

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💅 ARGUMENTS 💅

• s — your COMEDI subdevice. the main character of this whole situation fr fr.
• nbytes — the maximum space to reserve, in bytes. key word: maximum — she'll take what she can get, more on that down below 👀

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🌈 DESCRIPTION 🌈

okay so here's the vibe 🫶 this function reserves up to nbytes bytes of space to be written, inside the COMEDI acquisition data buffer that's associated with the subdevice. that's it, that's the job.

but here's the little plot twist 🎀 the amount you actually get reserved is limited by the space available — so you ask for nbytes and the buffer is like "bestie i can only do this much" and gives you what it can. no drama, just vibes. ✨

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⭐ RETURN ⭐

she returns the amount of space actually reserved, in bytes. 💖 check it, don't assume it — remember, availability said no to your full request sometimes.

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🔥 SEE ALSO 🔥

• Kernel file ./drivers/comedi/comedi_buf.c — the whole friend group lives here 🫶
• comedi_buf_write_free(9)
• comedi_buf_read_n_available(9)
• comedi_buf_read_alloc(9)
• comedi_buf_read_free(9)
• comedi_buf_write_samples(9)
• comedi_buf_read_samples(9)

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ngl this whole squad is giving "read and write, alloc and free" and honestly? balanced. as it should be. 💀✨

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and that's the page, bestie 🎀 this little love letter came from ./drivers/comedi, dated October 2026, and it's filed under comedi_buf_write_alloc(9) — slay, go reserve some space, periodt. 💜🌸