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	long __unused1;
 8	msgqnum_t msg_qnum;
 9	long __unused2;
10	msglen_t msg_qbytes;
11	long __unused3;
12	pid_t msg_lspid;
13	pid_t msg_lrpid;
14	unsigned long long __unused[2];
15};