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1// SPDX-License-Identifier: GPL-2.02// Test TCP_INQ and TCP_CM_INQ on the server side.3`./defaults.sh4`5 6// Initialize connection7 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 38 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 09 +0 bind(3, ..., ...) = 010 +0 listen(3, 1) = 011 12 +0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 10>13 +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>14 +.01 < . 1:1(0) ack 1 win 51415 16// Accept the connection and enable TCP_INQ.17 +0 accept(3, ..., ...) = 418 +0 setsockopt(4, SOL_TCP, TCP_INQ, [1], 4) = 019 20// Now we have 10K of data ready on the socket.21 +0 < . 1:10001(10000) ack 1 win 51422 +0 > . 1:1(0) ack 1000123 24// We read 2K and we should have 8K ready to read.25 +0 recvmsg(4, {msg_name(...)=...,26 msg_iov(1)=[{..., 2000}],27 msg_flags=0,28 msg_control=[{cmsg_level=SOL_TCP,29 cmsg_type=TCP_CM_INQ,30 cmsg_data=8000}]}, 0) = 200031// We read 8K and we should have no further data ready to read.32 +0 recvmsg(4, {msg_name(...)=...,33 msg_iov(1)=[{..., 8000}],34 msg_flags=0,35 msg_control=[{cmsg_level=SOL_TCP,36 cmsg_type=TCP_CM_INQ,37 cmsg_data=0}]}, 0) = 800038// Client sends more data and closes the connections.39 +0 < F. 10001:20001(10000) ack 1 win 51440 +0 > . 1:1(0) ack 2000241 42// We read 10K and we should have one "fake" byte because the connection is43// closed.44 +0 recvmsg(4, {msg_name(...)=...,45 msg_iov(1)=[{..., 10000}],46 msg_flags=0,47 msg_control=[{cmsg_level=SOL_TCP,48 cmsg_type=TCP_CM_INQ,49 cmsg_data=1}]}, 0) = 1000050// Now, receive error.51 +0 read(3, ..., 2000) = -1 ENOTCONN (Transport endpoint is not connected)52