ioctl_probe(9)

💅 ioctl_probe(9) — Kernel API Manual 🎀

okay so bestie, welcome to ioctl_probe(9) — yes that's the man page name AND the vibe, we love a title that eats 💖 this one lives in the Kernel API Manual and it's literally just here to tell you who your host is. identification era ✨

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🌸 NAME 🌸

ioctl_probe — return host identification

like, it probes. it identifies. it's giving "who are you and what are you running on" 🫶

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✨ SYNOPSIS ✨

int ioctl_probe (struct Scsi_Host *host , void __user *buffer );

copy it exactly bestie, spaces and all, no cap 🔥

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🦋 ARGUMENTS 🦋

• host — the host we're identifying, main character of the operation 👑
• buffer — a userspace buffer where the identification string is gonna live 🎀

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💅 RETURN 💅

• if it slays (successful), you get 1 back, plus an identifying string placed at buffer — but only if buffer is non-NULL, and it fills up to the length stored at * (int *) buffer. yes, the length is hiding inside the buffer itself, iconic honestly 😭
• <0 — an error code on failure, boo 💀

ngl bestie, always check that return value. <0 means it did NOT pass the vibe check 🙈

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🌈 SEE ALSO 🌈

Kernel file ./drivers/scsi/scsi_ioctl.c, plus the whole friend group:

• scsi_set_medium_removal(9)
• scsi_cmd_allowed(9)
• sg_scsi_ioctl(9)
• scsi_ioctl(9)
• scsi_ioctl_block_when_processing_errors(9)

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and that's the whole page, no skips, no cuts 🫶 it lives in ./drivers/scsi, dated October 2026, and it's still called ioctl_probe(9) — periodt. go off, kernel bestie 💜✨