TIOCTTYGSTRUCT(2const)

✨ TIOCTTYGSTRUCT ✨

okay so bestie, welcome to TIOCTTYGSTRUCT(2const) — yes that's the man page name, it's giving Very Long Acronym, and it lives in section 2const of the Linux man-pages 💅

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🌸 NAME 🌸

TIOCTTYGSTRUCT — kernel debugging 🤓

no fr, that's literally the whole job description. it's a debugging thing. an icon of "we needed this once, in the before times."

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🫶 LIBRARY 🫶

Standard C library (libc, -lc)

so like, link with -lc and you're good, that's the plain vanilla libc, no fancy extras needed 🎀

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💖 SYNOPSIS 💖

#include <sys/ioctl.h>

int ioctl(int fd, TIOCTTYGSTRUCT, struct tty_struct *argp);

#include <linux/tty.h>

struct tty_struct;

so you're calling ioctl() with your file descriptor fd, the request TIOCTTYGSTRUCT, and argp, which is a pointer to a struct tty_struct 👑

and yeah, struct tty_struct is just forward-declared — the page literally says:

struct tty_struct;

that's it, that's the struct, it's giving "mystery, intrigue, we're not telling you the fields" ✨

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🦋 DESCRIPTION 🦋

Get the tty_struct corresponding to fd.

that's the whole thing. you hand it a file descriptor, it hands you back the tty_struct that goes with it. lowkey straightforward, highkey ancient 🙈

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🌈 RETURN VALUE 🌈

• On success, 0 is returned 😌
• On error, -1 is returned, and errno is set to indicate the error 😭

classic ioctl behaviour, no surprises there, bestie 💜

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👑 HISTORY 👑

This operation was removed in Linux 2.5.67. 💀

not deprecated. not "discouraged". REMOVED. gone. this is a historical artefact, a museum piece, do not go looking for it on a modern kernel, it will not be there, periodt 🎀

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💅 SEE ALSO 💅

• ioctl(2)
• ioctl_tty(2)

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mwah that's the whole page, bestie 🫶 this rewrite came to you courtesy of Linux man-pages 6.20, dated 2026-02-08 — so go forth, know your ancient kernel-debugging ioctls, and remember: if you ever actually need TIOCTTYGSTRUCT, you are probably time travelling 🧚✨