comedi_buf_read_n_available(9)

✨ comedi_buf_read_n_available ✨

okay bestie so this is a page straight out of the Kernel API Manual — yes, the kernel API manual — and it's about one little function that tells you how much readable data you've got chilling in a COMEDI buffer. lowkey iconic. let's get into it 💅

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🌸 NAME 🌸

comedi_buf_read_n_available — literally just tells you how much readable buffer space there is. that's it. that's the whole job. 🫶

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🦋 SYNOPSIS 🦋

unsigned int comedi_buf_read_n_available (struct comedi_subdevice *s );

yep, that's the whole signature, one argument, returns an unsigned int. slay.

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🎀 ARGUMENTS 🎀

• s — a COMEDI subdevice. that's your struct comedi_subdevice *, the main character of this whole operation. 👑

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💖 DESCRIPTION 💖

so what this does is determine the amount of readable buffer space in the COMEDI acquisition data buffer associated with the subdevice. 🫧

and the readable buffer space? it's the stuff that's been freed by the writer and then "munged" into the sample data format that COMEDI expects — but only if necessary. no cap, that's the actual word from the docs: "munged". we love a technical term with range. 💀

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🌈 RETURN 🌈

the amount of readable buffer space. that's the return value, bestie, no surprises, no plot twists. ⭐

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🧚 SEE ALSO 🧚

kernel file ./drivers/comedi/comedi_buf.c, plus the whole squad of sibling functions:

• comedi_buf_write_alloc(9)
• comedi_buf_write_free(9)
• comedi_buf_read_alloc(9)
• comedi_buf_read_free(9)
• comedi_buf_write_samples(9)
• comedi_buf_read_samples(9)

like. it's giving buffer-alloc-and-free friend group and this function is absolutely part of it. iykyk. 🔥

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heads up: this page is from the kernel docs, so always double-check against the version of the kernel you're actually running, bestie. 🙈

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and that's the whole page, mwah 💋 — sourced from ./drivers/comedi, dated October 2026, filed under comedi_buf_read_n_available(9). go forth and read your buffers, queen. 👑💜