ipc_init(9)

💖 ipc_init(9) 💖

okay so this is the ipc_init(9) page from the Kernel API Manual, and bestie, it's a short one but we're gonna treat it with the respect it deserves 💅

---

🌸 NAME 🌸

ipc_init — initialise ipc subsystem

---

✨ SYNOPSIS ✨

int ipc_init (void );

---

🫶 ARGUMENTS 🫶

• void — no arguments, periodt. literally none. the void is voiding 🕳️

---

🔥 DESCRIPTION 🔥

okay so here's the tea: the various sysv ipc resources — semaphores, messages and shared memory — are initialised. that's the main character energy of this function ✨

also, a callback routine is registered into the memory hotplug notifier chain. since msgmni scales to lowmem, this callback routine will be called upon successful memory add / remove to recompute msmgni. yes bestie, msmgni, that's exactly what the page says 👀

---

👑 SEE ALSO 👑

Kernel file ./ipc/util.c — and the whole squad of related pages:

• 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_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)

xoxo, from ./ipc, October 2026 💋