| // SPDX-License-Identifier: GPL-2.0 |
| |
| `./defaults.sh` |
| |
| 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 0 <mss 1460> |
| +0 > S. 0:0(0) ack 1 <mss 1460> |
| |
| +.1 < . 1:1(0) ack 1 win 65530 |
| +0 accept(3, ..., ...) = 4 |
| |
| +0 setsockopt(4, SOL_TCP, TCP_USER_TIMEOUT, [3000], 4) = 0 |
| +0 write(4, ..., 24) = 24 |
| +0 > P. 1:25(24) ack 1 |
| +.1 < . 1:1(0) ack 25 win 65530 |
| +0 %{ assert tcpi_probes == 0, tcpi_probes; \ |
| assert tcpi_backoff == 0, tcpi_backoff }% |
| |
| // install a qdisc dropping all packets |
| +0 `tc qdisc delete dev tun0 root 2>/dev/null ; tc qdisc add dev tun0 root pfifo limit 0` |
| +0 write(4, ..., 24) = 24 |
| // When qdisc is congested we retry every 500ms |
| // (TCP_RESOURCE_PROBE_INTERVAL) and therefore |
| // we retry 6 times before hitting 3s timeout. |
| // First verify that the connection is alive: |
| +3.250 write(4, ..., 24) = 24 |
| // Now verify that shortly after that the socket is dead: |
| +.100 write(4, ..., 24) = -1 ETIMEDOUT (Connection timed out) |
| |
| +0 %{ assert tcpi_probes == 6, tcpi_probes; \ |
| assert tcpi_backoff == 0, tcpi_backoff }% |
| +0 close(4) = 0 |
