tb_wait_for_port(9)

📦 version 7.3.1, in nixpkgs unstable

💅 tb_wait_for_port — wait for a port to become ready

okay so bestie, this is the tb_wait_for_port page from the Kernel API Manual, section 9. it's short, it's sweet, and it's literally just "hey, is this port up yet?" energy. let's go 🫶

✨ SYNOPSIS ✨

int tb_wait_for_port (struct tb_port *port , bool wait_if_unplugged );

🎀 ARGUMENTS 🎀

  • port — the port we're waiting on. main character of this whole function, no cap.
  • wait_if_unplugged — the "should I also wait when the port is unplugged?" switch. if it's set, yes bestie, we wait for that too.

🌸 DESCRIPTION 🌸

so here's the vibe: this function waits up to 1 second for a port to reach state TB_PORT_UP. that's it, that's the whole job. ⏳

if wait_if_unplugged is set, then we also wait when the port is sitting in state TB_PORT_UNPLUGGED — and iykyk, that's because it takes a while for the device to be registered after switch resume. like, the device is showing up late to the party, we're just holding the door. 🙈

otherwise (if wait_if_unplugged is not set) we only wait if a device is registered but the link has not yet been established. so: device is here, link is still loading. we chill. 💅

🔥 RETURN 🔥

  • 0 — if the port is not connected, or it failed to reach state TB_PORT_UP within one second. awkward but okay. 😭
  • 1 — if the port is connected and in state TB_PORT_UP. slay, we love to see it 👑
  • Negative errno — an error occurred. something went wrong, sending hugs. 🫶

🦋 SEE ALSO 🦋

kernel file ./drivers/thunderbolt/switch.c, plus literally the entire friend group:

that's the whole page bestie, go forth and wait for ports responsibly 💖

so yeah, that's a wrap! this one lives in ./drivers/thunderbolt and the version/date stamp is October 2026 — remember it fondly, mwah 💜✨

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