ipc_rmid — remove an IPC identifier
struct kern_ipc_perm* ipc_rmid (struct ipc_ids * ids, int id);
The identifier must be valid, and in use. The kernel will panic if fed an invalid identifier. The entry is removed and internal variables recomputed. The object associated with the identifier is returned. ipc_ids.sem and the spinlock for this ID is hold before this function is called, and remain locked on the exit.