setactive(9)

✨ setactive(9) ✨

okay so this is a page from the Kernel API Manual, and bestie, we're talking about setactive — the write handler for "ipe/policies/$name/active". that's it, that's the vibe. it's the little function that handles you writing to that securityfs node 🎀

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🌸 SYNOPSIS 🌸

ssize_t setactive (struct file *f , const char __user *data , size_t len
, loff_t *offset );

she takes four args and returns a ssize_t, no cap. let's break her down 👇

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💅 ARGUMENTS 💅

• f — this is the struct file that represents the securityfs node. like, the actual file object you're poking at 🫶
• data — the buffer that got passed to the write syscall. this is the stuff you're trying to write in, bestie.
• len — the length of data. how much of it there is. size matters, literally.
• offset — unused. she's just here. sitting in the corner. not participating. 💀

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🔥 RETURN 🔥

here's what she gives back — every single one, no skips:

• Length of buffer written — Success ✨ iconic, we love a win
• -EPERM — Insufficient permission 😭 not you trying it without the clearance
• -EINVAL — Invalid input 🙈 something in what you passed was just... not it
• -ENOENT — Policy initializing/deleted 💀 the policy isn't there — either it's still booting up or it's already gone, ghosted you fr fr

ngl, if you get one of the negative ones, check your perms and your input before you blame the kernel, bestie 🫶

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🌈 SEE ALSO 🌈

go read these next, iykyk — they're all in the Kernel file ./security/ipe/policy_fs.c:

• struct ipefs_file(9)
• read_pkcs7(9)
• read_policy(9)
• read_name(9)
• read_version(9)
• getactive(9)
• update_policy(9)
• delete_policy(9)
• ipe_del_policyfs_node(9)
• ipe_new_policyfs_node(9)

like, the whole friend group. go say hi 👑

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and that's the page!! this one lives under ./security/ipe, dated October 2026, and it's setactive(9) through and through. mwah 💖 stay hydrated, read your man pages, and don't forget to check your return codes bestie 😭✨🎀