ipc_search_maxidx(9)

💅 ipc_search_maxidx(9) 💅

okay bestie, welcome to the Kernel API Manual entry for ipc_search_maxidx(9) — yes, we’re doing kernel internals today and honestly it’s giving main character energy. Let’s get into it 🫶✨

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✨ NAME ✨

ipc_search_maxidx — search for the highest assigned index. That’s the whole name vibe, and it ate 💅

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🌸 SYNOPSIS 🌸

the whole function-call situation is literally this:

int ipc_search_maxidx (struct ipc_ids *ids , int limit );

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🫶 ARGUMENTS 🫶

• ids — ipc identifier set. iconic little container, no cap.
• limit — known upper limit for highest assigned index. it’s the ceiling info you already have 🎀

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💅 DESCRIPTION 💅

okay so this function determines the highest assigned index in ids. It’s intended to be called when ids->max_idx needs to be updated. Updating ids->max_idx is necessary when the current highest index ipc object is deleted. If no ipc object is allocated, then -1 is returned. fr fr, that’s the whole behavior.

⚠️ ipc_ids.rwsem needs to be held by the caller. like, actually. no cap, do not skip this 💀

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🦋 SEE ALSO 🦋

Kernel file: ./ipc/util.c — and here’s the whole friend group:

• 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_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)

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okay bye bestie 💜 — source ./ipc, dated October 2026, signing off for ipc_search_maxidx(9) ✨🎀