1struct msqid_ds {
 2	struct ipc_perm msg_perm;
 3	unsigned long __msg_stime_hi;
 4	unsigned long __msg_stime_lo;
 5	unsigned long __msg_rtime_hi;
 6	unsigned long __msg_rtime_lo;
 7	unsigned long __msg_ctime_hi;
 8	unsigned long __msg_ctime_lo;
 9	unsigned long msg_cbytes;
10	msgqnum_t msg_qnum;
11	msglen_t msg_qbytes;
12	pid_t msg_lspid;
13	pid_t msg_lrpid;
14	unsigned long __unused[2];
15	time_t msg_stime;
16	time_t msg_rtime;
17	time_t msg_ctime;
18};