| // SPDX-License-Identifier: GPL-2.0 |
| `./defaults.sh` |
| |
| // Initialize connection |
| 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 |
| |
| +0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop> |
| +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK> |
| +.1 < . 1:1(0) ack 1 win 32792 |
| |
| |
| +0 accept(3, ..., ...) = 4 |
| |
| // Okay, we received nothing, and decide to close this idle socket. |
| // We set TCP_USER_TIMEOUT to 3 seconds because really it is not worth |
| // trying hard to cleanly close this flow, at the price of keeping |
| // a TCP structure in kernel for about 1 minute ! |
| +2 setsockopt(4, SOL_TCP, TCP_USER_TIMEOUT, [3000], 4) = 0 |
| +0 close(4) = 0 |
| |
| +0 > F. 1:1(0) ack 1 |
| +.3~+.400 > F. 1:1(0) ack 1 |
| +.3~+.400 > F. 1:1(0) ack 1 |
| +.6~+.800 > F. 1:1(0) ack 1 |
| |
| // We finally receive something from the peer, but it is way too late |
| // Our socket vanished because TCP_USER_TIMEOUT was really small |
| +0 < . 1:2(1) ack 1 win 32792 |
| +0 > R 1:1(0) |
