set_sgttyb(9)

💅 set_sgttyb(9) — like, the legacy terminal setter, bestie 💅

okay so this is a page from the Kernel API Manual (yes, that's the manual name, we're fancy now ✨) and it's all about set_sgttyb, which is giving "vintage but still iconic" energy. Come sit with me, I'll walk you through it 🫶

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✨ NAME ✨

set_sgttyb — set legacy terminal values 🌸

Like, it sets the old-school terminal values. Legacy. Vintage. Retro. It's giving "found this in the attic and it still works" 💖

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🌈 SYNOPSIS 🌈

int set_sgttyb (struct tty_struct *tty , struct sgttyb __user *sgttyb );

That's the whole signature, no cap, copy it exactly 💅

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🎀 ARGUMENTS 🎀

• tty — the tty structure. The terminal. The main character, honestly 👑
• sgttyb — a pointer to the old style terminal structure. Old style!! vintage!! she's got history 🦋

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🦋 DESCRIPTION 🦋

So what it actually does: it updates a terminal from the legacy BSD style terminal information structure. That's the whole thing. It's a glow-up for your terminal, but sourced from the old-school BSD struct, iykyk ✨

Locking: tty_struct->termios_rwsem 🔒

fr fr, that's the lock it takes — the termios rwsem on the tty struct. Don't be weird about it, just know it's there 💀

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⭐ RETURN ⭐

• 0 on success 🎉
• an error otherwise 😭

That's it. Zero means slay, anything else means something went sideways. Periodt.

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💜 SEE ALSO 💜

Kernel file ./drivers/tty/tty_ioctl.c — that's where she lives, bestie 🏠

And here's the whole friend group, all of them, not skipping a single one 💖:

• tty_chars_in_buffer(9)
• tty_write_room(9)
• tty_driver_flush_buffer(9)
• tty_unthrottle(9)
• tty_throttle_safe(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)
• tty_change_softcar(9)
• tty_mode_ioctl(9)

Like, the entire tty squad in one list. Obsessed. Go read them too, you won't regret it 🌈

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and that's the page, bestie!! this gem comes from ./drivers/tty and it's dated October 2026 — so yeah, she's new-ish but the values are legacy, which is honestly such a vibe mismatch and I love that for her 💅✨🫶