tty_throttle_safe(9)

💅 tty_throttle_safe — like, the flow control era

okay so real talk, this is tty_throttle_safe(9) from the Kernel API Manual, and she is lowkey the responsible friend who stops you from doing something chaotic 💖

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✨ NAME ✨

tty_throttle_safe — flow control, bestie. that's the whole vibe. 🌊

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🎀 SYNOPSIS 🎀

bool tty_throttle_safe (struct tty_struct *tty );

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🦋 ARGUMENTS 🦋

• tty — the terminal. yeah. that one. 🖥️

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🌸 DESCRIPTION 🌸

so basically you're indicating that a tty should stop transmitting data down the stack. like, "girl, pause. take a breather. 🛑"

but here's the iconic part: tty_throttle_safe will only attempt the throttle if tty->flow_change is TTY_THROTTLE_SAFE. no cap. it checks first.

and why does she check, you ask? because it prevents an accidental throttle due to race conditions when throttling is conditional on factors evaluated prior to throttling. like yeah, the vibes were evaluated earlier, but the situation may have changed by the time you actually get here — and this function is not about to throttle somebody by accident 💀 that's the whole "safe" in the name, iykyk.

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👑 RETURN 👑

true if the tty is throttled — or was already throttled, which honestly still counts, we love consistency 🫶

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🔥 SEE ALSO 🔥

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

• tty_chars_in_buffer(9)
• tty_write_room(9)
• tty_driver_flush_buffer(9)
• tty_unthrottle(9)
• tty_unthrottle_safe(9)
• tty_wait_until_sent(9)
• tty_termios_copy_hw(9)
• tty_termios_hw_change(9)
• tty_get_char_size(9)
• tty_get_frame_size(9)
• tty_set_termios(9)
• set_termios(9)
• set_sgttyb(9)
• tty_change_softcar(9)
• tty_mode_ioctl(9)

like literally the entire tty squad, go say hi 💜

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and that's the page, bestie! brought to you from ./drivers/tty in October 2026 — slay, drink water, and always check tty->flow_change before you throttle 🌈⭐💅