ccw_device_get_chp_desc(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ccw_device_get_chp_desc(9) — the kernel API manual, bestie edition 🎀

okay so real talk, this one's from the Kernel API Manual and it's giving "tiny function, very specific job" and honestly? we stan a specialist. 🌸

✨ NAME ✨

ccw_device_get_chp_desc — returns a newly allocated channel-path descriptor, fresh out the wrapper, no cap 🎁

🌈 SYNOPSIS 🌈

struct channel_path_desc_fmt0 * ccw_device_get_chp_desc (struct
ccw_device *cdev , int chp_idx );

like, exactly that, don't @ me 💅

🦋 ARGUMENTS 🦋

  • cdev — the device you want the descriptor for. it's the main character here 👑
  • chp_idx — the index of the channel path. yes it's a number, no you can't skip it 🙈

💖 DESCRIPTION 💖

so when it works, it returns a newly allocated copy of the channel-path description data that belongs to the channel path you pointed at. copy, as in yours to keep, as in somebody allocated that memory for you, iykyk 🫶

and if something goes sideways? it returns NULL. on error. that's it, that's the whole vibe. no cap. 😭

lowkey important: NULL means error, so check it before you go dereferencing like it's nothing 💀

🔥 SEE ALSO 🔥

the kernel file that lives at:

./drivers/s390/cio/device_ops.c

and the whole friend group, fr fr — go say hi to:

and that's the whole page, bestie 🧚 this little icon lives in ./drivers/s390/cio, dated October 2026, and it's filed under ccw_device_get_chp_desc(9) — go forth and get those descriptors ✨💜

📦 where this page comes from