1struct ipc_perm { 2 key_t __ipc_perm_key; 3 uid_t uid; 4 gid_t gid; 5 uid_t cuid; 6 gid_t cgid; 7 mode_t mode; 8 int __ipc_perm_seq; 9 long __pad1; 10 long __pad2; 11}; 12