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// SPDX-License-Identifier: GPL-2.0
// Test send-buffer-limited time in tcp_info for client side.
`./defaults.sh`
// Create a socket and set it to non-blocking.
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 fcntl(3, F_GETFL) = 0x2 (flags O_RDWR)
+0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
+0 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress)
+0 > S 0:0(0) <mss 1460,sackOK,TS val 100 ecr 0,nop,wscale 8>
+.01 < S. 0:0(0) ack 1 win 10000 <mss 1000,sackOK,nop,nop,nop,wscale 8>
+0 > . 1:1(0) ack 1
+0 getsockopt(3, SOL_SOCKET, SO_ERROR, [0], [4]) = 0
+0 fcntl(3, F_SETFL, O_RDWR) = 0 // set back to blocking
+0 setsockopt(3, SOL_SOCKET, SO_SNDBUF, [10000], 4) = 0
+0 getsockopt(3, SOL_SOCKET, SO_SNDBUF, [20000], [4]) = 0
+.09...0.14 write(3, ..., 150000) = 150000
+.01 < . 1:1(0) ack 10001 win 10000
+.01 < . 1:1(0) ack 30001 win 10000
// cwnd goes from 40(60KB) to 80(120KB), and that we hit the tiny sndbuf limit 10KB
+.01 < . 1:1(0) ack 70001 win 10000
+.02 < . 1:1(0) ack 95001 win 10000
+0 %{ assert 19000 <= tcpi_sndbuf_limited <= 21000, tcpi_sndbuf_limited; \
assert 49000 <= tcpi_busy_time <= 52000, tcpi_busy_time; \
assert 0 == tcpi_rwnd_limited, tcpi_rwnd_limited }%
// This ack frees up enough buffer so we are no longer
// buffer limited (socket flag SOCK_NOSPACE is cleared)
+.02 < . 1:1(0) ack 150001 win 10000
+0 %{ assert 19000 <= tcpi_sndbuf_limited <= 21000, tcpi_sndbuf_limited;\
assert 69000 <= tcpi_busy_time <= 73000, tcpi_busy_time;\
assert 0 == tcpi_rwnd_limited, tcpi_rwnd_limited }%
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