binder_ctl_ioctl(9)

💅 binder_ctl_ioctl — like, the whole kernel API manual moment ✨

okay so bestie, welcome to binder_ctl_ioctl(9) — yes that's the manual page name AND the section number, we love a consistent queen 🎀 this one lives in the Kernel API Manual and it's all about handling binder device node allocation requests. lowkey iconic.

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🌸 NAME 🌸

binder_ctl_ioctl — handles binder device node allocation requests ✨ that's literally the whole job description and she ate 💅

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🦋 SYNOPSIS 🦋

long binder_ctl_ioctl (struct file *file , unsigned int cmd , unsigned long arg );

that's the signature, bestie — copy it exactly, no cap, don't you dare retype it from memory 😭

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🎀 ARGUMENTS 🎀

• file — the file pointer for the binder-control device node. yes, that device node 🫶
• cmd — the ioctl command. the vibe check of what you're asking for 💫
• arg — the ioctl argument. the lil payload that comes along for the ride 🌈

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💖 DESCRIPTION 💖

so this is the request handler for the binder-control device, fr fr. every single request operates on the binderfs mount that the binder-control device resides in — like, that's the whole universe she's working with ✨

and here's the one request on the menu:

• BINDER_CTL_ADD — allocate a new binder device 💅 boom. new device. main character energy 👑

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🔥 RETURN 🔥

• 0 on success — slay 💖
• negative errno on failure — not slay, but that's the contract 😭

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⭐ SEE ALSO ⭐

• Kernel file ./drivers/android/binderfs.c — go read the source, iykyk 📖
• binderfs_binder_device_create(9) — her cousin 💫
• binderfs_binder_ctl_create(9) — her other cousin 🌸

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ngl bestie, this page is short but she's mighty — everything above is the whole lore, don't go inventing extra behaviour, that's not the vibe 🙈

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and that's the page!! 🎀 source: ./drivers/android, dated October 2026, filed under binder_ctl_ioctl(9) — mwah, go forth and allocate responsibly 🫶💜✨