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// SPDX-License-Identifier: GPL-2.0
//
// Minimal passive open.
// Peer is first to close.
`./defaults.sh`
// Open listener socket
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+0 bind(3, ..., ...) = 0
+0 listen(3, 1) = 0
// Incoming connection: passive open: three-way handshake
+0 < S 0:0(0) win 65535 <mss 1000,sackOK,nop,nop,nop,wscale 8>
+0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
+0 < . 1:1(0) ack 1 win 257
// Open connection socket and close listener socket
+0 accept(3, ..., ...) = 4
+0 close(3) = 0
// Peer sends data: acknowledge and receive
+0 < P. 1:1001(1000) ack 1 win 257
+0 > . 1:1(0) ack 1001
+0 recv(4, ..., 1000, 0) = 1000
// Peer initiates connection close
+0 < F. 1001:1001(0) ack 1 win 257
+.04 > . 1:1(0) ack 1002
// Local socket also closes its side
+0 close(4) = 0
+0 > F. 1:1(0) ack 1002
+0 < . 1002:1002(0) ack 2 win 257
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