+.PP
+The fields of the
+.I msgid_ds
+structure are as follows:
+.TP 11
+.I msg_perm
+This is an
+.I ipc_perm
+structure (see below) that specifies the access permissions on the message
+queue.
+.TP
+.I msg_qnum
+Number of messages currently on the message queue.
+.TP
+.I msg_qbytes
+Maximum number of bytes of message text allowed on the message
+queue.
+.TP
+.I msg_lspid
+ID of the process that performed the last
+.BR msgsnd (2)
+system call.
+.TP
+.I msg_lrpid
+ID of the process that performed the last
+.BR msgrcv (2)
+system call.
+.TP
+.I msg_stime
+Time of the last
+.BR msgsnd (2)
+system call.
+.TP
+.I msg_rtime
+Time of the last
+.BR msgrcv (2)
+system call.
+.TP
+.I msg_ctime
+Time of creation of queue or time of last
+.BR msgctl ()
+.BR IPC_SET
+operation.