issei_cl_write(9)

📦 version 7.3.1, in nixpkgs unstable

💖 issei_cl_write(9) 💖

okay so this is a page from the Kernel API Manual — the issei_cl_write one, and honestly bestie, it's a whole little vibe. it's a kernel API manual page, which means it's ✨official✨, and we're gonna get through it together. no cap.

🌸 NAME 🌸

issei_cl_write — enqueue write request

like, it puts a write request in the queue. that's the whole personality. 🎀

✨ SYNOPSIS ✨

ssize_t issei_cl_write (struct issei_host_client *cl , const u8 *buf ,
size_t buf_size );

look at that signature. it's giving "takes three things and returns an ssize_t". icon behavior. 👑

🦋 ARGUMENTS 🦋

  • cl — the host client. that's your main character struct, struct issei_host_client *. 🫶
  • buf — buffer to write. it's const u8 *, so it's the actual bytes going out. 💅
  • buf_size — buffer size, as a size_t. yes, you gotta tell it how big the buffer is, it's not a mind reader. 😭

🌈 DESCRIPTION 🌈

so the way this works: issei_cl_write adds a write request to the write queue and then wakes the working thread. that's it, that's the job. 🔥

⚠️ okay but listen — this is the important part, don't skip it — this call takes ownership of the buf memory, if succeeded. so if it works, that memory is not yours anymore, it's the call's. literally do not touch it after. that's the whole deal. 💀

⭐ RETURN ⭐

  • returns the size of data on success 💖
  • returns <0 on error 🙈

that's it, that's the return value. size_t-shaped good news or a negative bad time. periodt.

👑 SEE ALSO 👑

okay there's a whole friend group here, and they're all in the kernel file ./drivers/misc/issei/host_client.c :

^ that's the squad. go read them too, iykyk. 🧚

and that's the page!! 💜 this lil gem lives at ./drivers/misc/issei and it's dated October 2026, and it's filed under issei_cl_write(9) — so if you ever need to find it again, you know exactly where to look. slay. 💅✨🍓

📦 where this page comes from