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};
13