tty_buffer_space_avail(9)

🌸 tty_buffer_space_avail(9) 🌸

okay so bestie 💖 this is the Kernel API Manual page for tty_buffer_space_avail(9) — tiny function, very specific job, honestly iconic. Let's get into it ✨

✨ NAME ✨

tty_buffer_space_avail — return unused buffer space 💅

✨ SYNOPSIS ✨

unsigned int tty_buffer_space_avail (struct tty_port *port );

🫶 ARGUMENTS 🫶

• port — the tty port owning the flip buffer. she's literally holding the buffer, no cap 🫶

💖 RETURN 💖

the # of bytes which can be written by the driver without reaching the buffer limit. it's giving "here's your room report" ✨

⚠️ NOTE ⚠️

this does not guarantee that memory is available to write the returned # of bytes (use tty_prepare_flip_string to pre-allocate if memory guarantee is required). so yeah, don't @ me 😭 — if you need that memory guarantee, do the pre-allocate thing, fr fr.

👀 SEE ALSO 👀

Kernel file ./drivers/tty/tty_buffer.c — and the whole friend group:

• tty_buffer_lock_exclusive(9)
• tty_buffer_unlock_exclusive(9)
• tty_buffer_free_all(9)
• tty_buffer_alloc(9)
• tty_buffer_free(9)
• tty_buffer_flush(9)
• __tty_buffer_request_room(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)

bye bestie 💖 stay spacey ✨ — source/version: ./drivers/tty, date: October 2026, page: tty_buffer_space_avail(9) 🎀