ipc_obtain_object_idr(9)

💅 ipc_obtain_object_idr — Kernel API Manual, bestie edition

okay so picture this: you're in the kernel, you've got an ipc id, and you need the actual ipc object that goes with it. that's literally this function's whole job. ipc_obtain_object_idr — look for an id in the ipc ids idr and return the associated ipc object. that's it, that's the gig ✨

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🌸 SYNOPSIS

struct kern_ipc_perm * ipc_obtain_object_idr (struct ipc_ids *ids , int id );

she takes two things and gives you back a struct kern_ipc_perm *, no cap 🫶

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🎀 ARGUMENTS

• ids — the ipc identifier set. your whole little friend group of ipc things 👯‍♀️
• id — the ipc id you're out here looking for. the one. the main character 🔍

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💖 DESCRIPTION

Call this inside the RCU critical section. like, that's not a suggestion, that's the vibe check — you gotta be in it. 🧚

⚠️ and hear me on this one: the ipc object is *not* locked on exit. not even a little bit. do not walk away thinking she's locked, because she is not, and that's the kind of assumption that ruins your whole day 😭

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🦋 SEE ALSO

Kernel file ./ipc/util.c — that's where the magic lives, go read her fr fr 📖

and the whole extended cinematic universe, in order:

• ipc_init(9)
• ipc_init_ids(9)
• ipc_init_proc_interface(9)
• ipc_findkey(9)
• ipc_addid(9)
• ipcget_new(9)
• ipc_check_perms(9)
• ipcget_public(9)
• ipc_kht_remove(9)
• ipc_search_maxidx(9)
• ipc_rmid(9)
• ipc_set_key_private(9)
• ipcperms(9)
• kernel_to_ipc64_perm(9)
• ipc64_perm_to_ipc_perm(9)
• ipc_obtain_object_check(9)
• ipcget(9)
• ipc_update_perm(9)
• ipcctl_obtain_check(9)
• ipc_parse_version(9)
• sysvipc_find_ipc(9)

yeah that's a lot of them. read them all. i believe in you 👑

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✨ mwah, that's the page ✨ this iconic little number lives in ./ipc, dropped October 2026, and goes by ipc_obtain_object_idr(9) — go be the RCU-critical-section main character you were always meant to be 💜🎀