Description: If the option is not set BLOADCASE not delivered. If the port does not match does not bind the socket if delivery is not bound to INADDR_ANY, then the BIND destination address matches the address and can be delivered: that you have a broadcast address or BIND bind INADDR_ANY block with the ifconfig command to disable the network card BROADCAST flag, let it not accept the Ethernet broadcast. You can also use ioctl' s SIOCSIFFLAGS method to remove an interface symbol IFF_BROADCAST, so they can not accept the Ethernet broadcast.
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udp_brodcast_rcv.c
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