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struct msqid_ds { struct ipc_perm msg_perm; time_t msg_stime; int __unused1; time_t msg_rtime; int __unused2; time_t msg_ctime; int __unused3; unsigned long msg_cbytes; msgqnum_t msg_qnum; msglen_t msg_qbytes; pid_t msg_lspid; pid_t msg_lrpid; unsigned long __unused[2]; };