ipc_findkey(9)

✨ NAME ✨

Okay so, bestie, welcome to the ipc_findkey(9) page from the Kernel API Manual 💖. The official vibe is ipc_findkey — find a key in an ipc identifier set. That’s literally the whole job, and it ate 💅.

🌸 SYNOPSIS 🌸

struct kern_ipc_perm * ipc_findkey (struct ipc_ids *ids , key_t key );

🎀 ARGUMENTS 🎀

• ids — the ipc identifier set. This is the squad we’re searching through.
• key — the key to find. The main character we’re looking for 🔥.

🦋 DESCRIPTION 🦋

Here’s the tea ☕: this returns the locked pointer to the ipc structure if it finds the key, or NULL otherwise. No cap. If key is found, ipc points to the owning ipc structure — that’s the connection you want, bestie 🫶.

Heads up: this is called with the writer ipc_ids.rwsem held. That’s the locking situation, and it’s not optional — respect the rwsem 💀.

💜 SEE ALSO 💜

Kernel file ./ipc/util.c — and look at this iconic friend group:

• ipc_init(9)
• ipc_init_ids(9)
• ipc_init_proc_interface(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_idr(9)
• ipc_obtain_object_check(9)
• ipcget(9)
• ipc_update_perm(9)
• ipcctl_obtain_check(9)
• ipc_parse_version(9)
• sysvipc_find_ipc(9)

This little kernel moment is signed off by ./ipc, dated October 2026, and it’s the ipc_findkey(9) page. Byeee, go find those keys 💅✨