Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2//
3// Minimal passive open.
4// Peer is first to close.
5
6`./defaults.sh`
7
8 // Open listener socket
9 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
10 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
11 +0 bind(3, ..., ...) = 0
12 +0 listen(3, 1) = 0
13
14 // Incoming connection: passive open: three-way handshake
15 +0 < S 0:0(0) win 65535 <mss 1000,sackOK,nop,nop,nop,wscale 8>
16 +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
17 +0 < . 1:1(0) ack 1 win 257
18
19 // Open connection socket and close listener socket
20 +0 accept(3, ..., ...) = 4
21 +0 close(3) = 0
22
23 // Peer sends data: acknowledge and receive
24 +0 < P. 1:1001(1000) ack 1 win 257
25 +0 > . 1:1(0) ack 1001
26 +0 recv(4, ..., 1000, 0) = 1000
27
28 // Peer initiates connection close
29 +0 < F. 1001:1001(0) ack 1 win 257
30 +.04 > . 1:1(0) ack 1002
31
32 // Local socket also closes its side
33 +0 close(4) = 0
34 +0 > F. 1:1(0) ack 1002
35 +0 < . 1002:1002(0) ack 2 win 257