linux/tools/testing/selftests/net/packetdrill/tcp_close_close-on-syn-sent...

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// SPDX-License-Identifier: GPL-2.0
// Test to make sure no RST is being sent when close()
// is called on a socket with SYN_SENT state.
`./defaults.sh`
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
+0 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress)
+0 > S 0:0(0) <...>
// Application decideds to close the socket in SYN_SENT state
// Make sure no RST is sent after close().
+0 close(3) = 0
// Receive syn-ack to trigger the send side packet examination:
// If a RESET were sent right after close(), it would have failed with
// a mismatched timestamp.
+.1 < S. 0:0(0) ack 1 win 32000 <mss 1460,nop,wscale 7>
+0 > R 1:1(0)