__tty_buffer_request_room(9)

💖 __tty_buffer_request_room(9) 💖

okay so bestie, we’re in the Kernel API Manual, and this page is literally about making room in a tty buffer. it’s giving “make some space” energy, and I’m obsessed. 🦋

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✨ NAME ✨

__tty_buffer_request_room — grow tty buffer if needed

🌸 SYNOPSIS 🌸

int __tty_buffer_request_room (struct tty_port *port , size_t size ,
bool flags );

🎀 ARGUMENTS 🎀

• port — tty port, aka the tty port in question 💅
• size — size desired; the amount of room you’re asking for ✨
• flags — buffer has to store flags along character data; this tells it whether flags need to ride along with the character data 🫶

🦋 DESCRIPTION 🦋

okay so the mission is simple: make at least size bytes of linear space available for the tty buffer. that’s the whole vibe. 💖

and here’s the plot twist: it will change over to a new buffer if the current buffer is encoded as TTY_NORMAL (so has no flags buffer) and the new buffer requires a flags buffer. main character buffer-swap energy, fr fr. 🔥

⭐ RETURN ⭐

the size we managed to find. that’s it, that’s the return value — the size we managed to find. periodt. 😭💜

🌈 SEE ALSO 🌈

Kernel file ./drivers/tty/tty_buffer.c — and the whole crew is here:

• tty_buffer_lock_exclusive(9)
• tty_buffer_unlock_exclusive(9)
• tty_buffer_space_avail(9)
• tty_buffer_free_all(9)
• tty_buffer_alloc(9)
• tty_buffer_free(9)
• tty_buffer_flush(9)
• tty_prepare_flip_string(9)
• tty_ldisc_receive_buf(9)
• flush_to_ldisc(9)
• tty_flip_buffer_push(9)
• tty_insert_flip_string_and_push_buffer(9)
• tty_buffer_init(9)
• tty_buffer_set_limit(9)

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cute little sign-off: from the ./drivers/tty source/version, dated October 2026, for __tty_buffer_request_room(9) — bye bestie, slay your buffers 💅🫶