1struct msqid_ds { 2 struct ipc_perm msg_perm; 3 int __unused1; 4 time_t msg_stime; 5 int __unused2; 6 time_t msg_rtime; 7 int __unused3; 8 time_t msg_ctime; 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}; 16