1struct msqid_ds {
 2	struct ipc_perm msg_perm;
 3	time_t msg_stime;
 4	time_t msg_rtime;
 5	time_t msg_ctime;
 6	unsigned long msg_cbytes;
 7	msgqnum_t msg_qnum;
 8	msglen_t msg_qbytes;
 9	pid_t msg_lspid;
10	pid_t msg_lrpid;
11	unsigned long __unused[2];
12};