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Message control flags are used in socket Recv and Send operations.
Flag Name Meaning
&01
MSG_OOB
Send/Read 'out-of-band' data
&02
MSG_PEEK
Examine data
&04
MSG_DONTROUTE
Send without using the routing tables
&08
MSG_EOR
Recvmsg
reports this data completes the record
&10
MSG_TRUNC
Recvmsg
reports data was truncated
&20
MSG_CTRUNC
Recvmsg
reports control data was truncated
&40
MSG_WAITALL
Force blocking
&80
MSG_DONTWAIT
Force non-blocking
&100
MSG_EOF
Data is the last to be sent
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