39 lines
1.3 KiB
Plaintext
39 lines
1.3 KiB
Plaintext
// Test that a socket w/ TCP_USER_TIMEOUT set aborts the connection
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// if there is pending unacked data after the user specified timeout.
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0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
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+0 bind(3, ..., ...) = 0
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+0 listen(3, 1) = 0
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// Establish a connection without timestamps.
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+0 < S 0:0(0) win 32792 <mss 1460,sackOK,nop,nop,nop,wscale 7>
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+0 > S. 0:0(0) ack 1 <...>
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+0.1 < . 1:1(0) ack 1 win 32792
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+0.100 accept(3, ..., ...) = 4
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// Okay, we received nothing, and decide to close this idle socket.
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// We set TCP_USER_TIMEOUT to 3 seconds because really it is not worth
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// trying hard to cleanly close this flow, at the price of keeping
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// a TCP structure in kernel for about 1 minute!
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+2 setsockopt(4, SOL_TCP, TCP_USER_TIMEOUT, [3000], 4) = 0
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// The write/ack is required mainly for netstack as netstack does
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// not update its RTO during the handshake.
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+0 write(4, ..., 100) = 100
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+0 > P. 1:101(100) ack 1 <...>
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+0 < . 1:1(0) ack 101 win 32792
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+0 close(4) = 0
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+0 > F. 101:101(0) ack 1 <...>
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+.2~+.300 > F. 101:101(0) ack 1 <...>
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+.4~+.500 > F. 101:101(0) ack 1 <...>
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+.8~+.900 > F. 101:101(0) ack 1 <...>
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// We finally receive something from the peer, but it is way too late
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// Our socket vanished because TCP_USER_TIMEOUT was really small.
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+1.61 < . 1:2(1) ack 102 win 32792
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+0 > R 102:102(0) win 0
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