accept() return point vs incoming SYN
3-way handshake is (1) C->S SYN (2) C->S SYN (3) C->S ACK.
The accept syscall returns at the point when packet #3 is received on
correct ? Not when packet #1 is received.
Is it same on all OSes ? Are there OS where accept
returns after packets No.1 is received by server ?
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