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// Test TCP_MAXSEG works on active/client TCP connections.
// Create a socket.
0.000 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
// Set MSS to 1100.
0.010 setsockopt(3, SOL_TCP, TCP_MAXSEG, [1100], 4) = 0
// TODO(ncardwell): the following is silly; should we fix it?
0.020 getsockopt(3, SOL_TCP, TCP_MAXSEG, [536], [4]) = 0
0.100...0.200 connect(3, ..., ...) = 0
// Establish a connection with an outgoing advertised MSS of 1100.
0.100 > S 0:0(0) <mss 1100,sackOK,TS val 100 ecr 0,nop,wscale 6>
0.200 < S. 0:0(0) ack 1 win 32792 <mss 1460,nop,wscale 7>
0.200 > . 1:1(0) ack 1
0.300 getsockopt(3, SOL_TCP, TCP_MAXSEG, [1100], [4]) = 0
0.400 %{ assert tcpi_advmss == 1100; assert tcpi_snd_mss == 1100 }%
// IW10 MSS should yield outgoing TSO packet with 10*1100 == 11000 bytes:
0.500 write(3, ..., 12000) = 12000
0.500 > . 1:11001(11000) ack 1
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