socket

bobcuer

1.         construct the bsd socket data structure, noted that there is no /dev/eth0 exists
2.         write system call will finally put the user datagram from socket buffer into NIC’s sending queue
3.         the copying from sending queue to NIC’s device memory ( data send activity ) is done by soft irq
4.         after data sent, an interruption is triggered, the results will be checked
5.         read much like write with a reversed direction, finally the payload will be copied to the socket buffer



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