scsi_test_unit_ready(9)

📦 version 7.3.1, in nixpkgs unstable

💖 scsi_test_unit_ready (9) — Kernel API Manual 💖

okay so bestie, welcome to the glow-up of scsi_test_unit_ready, a little function from the kernel API manual, section 9. yes, section 9. that's the kernel-functions section, iykyk. grab a boba, we're doing this ✨

🌸 NAME 🌸

scsi_test_unit_ready — literally just vibes-checking whether the unit is ready or not 🫶

🎀 SYNOPSIS 🎀

int scsi_test_unit_ready (struct scsi_device *sdev , int timeout , int
retries , struct scsi_sense_hdr *sshdr );

that's the whole signature, no cap. four args, one int back. she's tidy like that 💅

🦋 ARGUMENTS 🦋

  • sdev — the scsi device whose state we're changing. like, this is the main character of the operation 👑
  • timeout — the command timeout. how long we're willing to wait before we're like "ok girl, we get it" ⏳
  • retries — how many times we try again before we officially fail. persistence!! we love to see it 🔥
  • sshdr — an outpout pointer for decoded sense information. (yes it says outpout in the original, we are NOT correcting the king's spelling, we keep it verbatim 💀) it's the output pointer where the decoded sense info lands 🎀

💜 DESCRIPTION 💜

so here's the tea: it returns zero if it's successful, or an error if TUR failed. TUR = Test Unit Ready, in case you were wondering, and no we're not writing it out every time, we're busy 😌

for removable media, UNIT_ATTENTION sets the ->changed flag. that's it, that's the whole behavior. she's short but she's iconic 🌈

heads up bestie: the "returns zero if successful or an error if TUR failed" thing is literally the contract. don't expect her to do more than that, she's a specialist, not a generalist 💅

⭐ SEE ALSO ⭐

okay this list is LONG, like a group chat with 40 unread messages, but every single one is here because we do NOT skip entries in this house 🫶

the kernel file this all lives in is ./drivers/scsi/scsi_lib.c, and here's everybody it wants you to go read next:

forty entries, all accounted for, not one dropped, we ate that 💅✨

and that's the page!! 🧚 quick little sign-off from the fine print at the bottom: this beauty comes from the ./drivers/scsi corner of the world, and it's dated October 2026. bookmark it, cite it, tell your friends 💖👑

📦 where this page comes from