1 #ifndef _LINUX_IPC_H 2 #define _LINUX_IPC_H 3 4 #include <linux/spinlock.h> 5 #include <linux/uidgid.h> 6 #include <uapi/linux/ipc.h> 7 8 #define IPCMNI 32768 /* <= MAX_INT limit for ipc arrays (including sysctl changes) */ 9 10 /* used by in-kernel data structures */ 11 struct kern_ipc_perm { 12 spinlock_t lock; 13 bool deleted; 14 int id; 15 key_t key; 16 kuid_t uid; 17 kgid_t gid; 18 kuid_t cuid; 19 kgid_t cgid; 20 umode_t mode; 21 unsigned long seq; 22 void *security; 23 24 struct rcu_head rcu; 25 atomic_t refcount; 26 } ____cacheline_aligned_in_smp __randomize_layout; 27 28 #endif /* _LINUX_IPC_H */ 29