vc_do_resize(9)

💅 vc_do_resize(9) — bestie, it's the Kernel API Manual

okay so picture this: you're deep in the kernel, everything's a tty, and someone needs to change the size of a virtual console. that's this function. it's literally the resizing method for the tty, and yes, it's kind of a main character. 🎀

---

✨ SYNOPSIS ✨

int vc_do_resize (struct tty_struct *tty , struct vc_data *vc , unsigned
int cols , unsigned int lines , bool from_user );

no cap, that signature is long but she's worth it. 🫶

---

🌸 ARGUMENTS 🌸

• tty — the tty being resized. the one getting a glow-up.
• vc — virtual console private data. her personal little diary. 📓
• cols — columns. the width situation.
• lines — lines. the height situation.
• from_user — invoked by a user? like, was this their idea? 🙈

---

💖 DESCRIPTION 💖

so what she does is resize a virtual console — and bestie, she clips according to the actual constraints, meaning she's not out here making promises she can't keep. icons only. ✨

now here's the cute part: if the caller passes a tty structure, she also updates the termios winsize information and performs any necessary signal handling. the way that she multitasks… obsessed. 💅

🔒 Locking (do NOT skip this one, i'm serious): the caller must hold the console semaphore. she takes the termios rwsem and ctrl.lock of the tty IFF a tty is passed. iykyk — get the locking wrong and it's giving undefined chaos. 😭

---

🦋 SEE ALSO 🦋

kernel file ./drivers/tty/vt/vt.c — plus the whole friend group:

• vc_font_pitch(9)
• vc_font_size(9)
• __vc_resize(9)
• vt_resize(9)
• enum vc_ctl_state(9)
• vc_sanitize_unicode(9)
• vc_translate_unicode(9)
• vt_kmsg_redirect(9)
• con_is_bound(9)
• con_is_visible(9)
• con_debug_enter(9)
• con_debug_leave(9)
• do_unregister_con_driver(9)

---

and that's the page, bestie! 🌈 this one lives under ./drivers/tty/vt, dated October 2026, and it's filed as vc_do_resize(9) in the Kernel API Manual. go resize something responsibly, mwah 🍓💜