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struct msqid_ds { struct ipc_perm msg_perm; time_t msg_stime; time_t msg_rtime; time_t msg_ctime; unsigned long msg_cbytes; msgqnum_t msg_qnum; msglen_t msg_qbytes; pid_t msg_lspid; pid_t msg_lrpid; unsigned long __pad1; unsigned long __pad2; };