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I have a function which call by

test0.write() to write to some register

how do I do this

char str[7]="test";
strcat(str, "0");

so I can do this

how do I timestamp recfrom function(time completion for receiving a packet)? search google didn't find anything useful

in this example The Linux socket and network programming on multicasting client-server with C program example why they assign

localInterface.s_addr = inet_addr("203.106.93.94");

in the sender?...

in the linked example

The Linux socket and network programming on multicasting client-server with C program example

both sender/receiver assign to a local ip 203.106.93.94 and bound to group ip...

anyway to use ifconfig etc to set ip and netmask in C? if not whats the easy way to do it?

is there anyway to block/wait until certain event happen before move to next function for example

while
1 wait for ethrnet packet, only move to 2 when receive a Ethernet message or some kind wait...

is there any example on how to broadcast same message to multiple client simultaneously