iio_buffer_read(9)

💅 NAME 💅

iio_buffer_read - chrdev read for buffer access. That's the whole name vibe, bestie: it's the chrdev read for buffer access, and we're obsessed with the clarity. ✨

✨ SYNOPSIS ✨

ssize_t iio_buffer_read (struct file *filp , char __user *buf , size_t n , loff_t *f_ps );

Okay so that's the signature, no cap — ssize_t return, function named iio_buffer_read, and all four args are right there. Keep it exactly like that. Signatures are not a vibe you freestyle. 💅

🎀 ARGUMENTS 🎀

• filp — File structure pointer for the char device. It's the struct file * for the char device, periodt.
• buf — Destination buffer for iio buffer read. This is where the iio buffer read is headed, bestie.
• n — First n bytes to read. Literally the first n bytes, exactly as it says. 🍓
• f_ps — Long offset provided by the user as a seek position. It's a loff_t *, and it's the seek-position offset the user gave you.

🦋 DESCRIPTION 🦋

This function relies on all buffer implementations having an iio_buffer as their first element.

That's the whole description, and it's giving foundational structural requirement. No cap: every buffer implementation needs that iio_buffer sitting first, because that's what this function relies on. 💖

🔥 RETURN 🔥

The return situation is: negative values corresponding to error codes, or ret != 0 for ending the reading activity.

So bestie, if you see a negative value, that's an error code moment. And ret != 0? That's the "ending the reading activity" signal. Not me being dramatic — that's literally the documented return behavior. 😭

🌈 SEE ALSO 🌈

Kernel file ./drivers/iio/industrialio-buffer.c, plus this whole iconic lineup:

• iio_buffer_poll(9)
• iio_buffer_wakeup_poll(9)
• iio_scan_mask_set(9)
• struct iio_demux_table(9)
• iio_validate_scan_mask_onehot(9)
• iio_push_to_buffers(9)
• iio_push_to_buffers_with_ts_unaligned(9)
• iio_buffer_release(9)
• iio_buffer_get(9)
• iio_buffer_put(9)
• iio_device_attach_buffer(9)

💌 cute little sign-off: this page comes from ./drivers/iio, dated October 2026, and it's the iio_buffer_read(9) manual page. mwah, go read some buffers responsibly 🫶✨