ipcperms(9)

okay so bestie, welcome to ipcperms(9) from the Kernel API Manual — this is the little function that does a vibe check on ipc permissions, and we're gonna read it together 💅✨

✨ NAME ✨

ipcperms — check ipc permissions. That's it, that's the whole name, and honestly she ate. 💖

🌸 SYNOPSIS 🌸

int ipcperms (struct ipc_namespace *ns , struct kern_ipc_perm *ipcp ,
short flag );

No cap, that's the exact signature — keep the spacing, bestie. 🫶

🎀 ARGUMENTS 🎀

• ns — ipc namespace. The namespace we're checking against, periodt.
• ipcp — ipc permission set. This is the permission set getting the vibe check.
• flag — desired permission set. What access we're asking about, iykyk.

💖 DESCRIPTION 💖

Okay so the actual tea: it checks user, group, other permissions for access to ipc resources. If access is allowed, it returns 0 — slay, we love a zero. 😌✨

And about that flag: it will most probably be 0 or S_...UGO from <linux/stat.h>. That's the literal note, bestie — no invented extras, fr fr. 🍓

🦋 SEE ALSO 🦋

The kernel file ./ipc/util.c is right there in the mix, plus this whole friend group of related calls:

• 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)
• 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 page came from ./ipc and is dated October 2026 — ipcperms(9) signing off, mwah 💋✨