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1// SPDX-License-Identifier: GPL-2.02// Test TCP_INQ and TCP_CM_INQ on the client side.3`./defaults.sh4`5 6// Create a socket and set it to non-blocking.7 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 38 +0 fcntl(3, F_GETFL) = 0x2 (flags O_RDWR)9 +0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 010 11// Connect to the server and enable TCP_INQ.12 +0 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress)13 +0 setsockopt(3, SOL_TCP, TCP_INQ, [1], 4) = 014 15 +0 > S 0:0(0) <mss 1460,sackOK,TS val 100 ecr 0,nop,wscale 8>16 +.01 < S. 0:0(0) ack 1 win 5792 <mss 1460,sackOK,TS val 700 ecr 100,nop,wscale 7>17 +0 > . 1:1(0) ack 1 <nop,nop,TS val 200 ecr 700>18 19// Now we have 10K of data ready on the socket.20 +0 < . 1:10001(10000) ack 1 win 51421 +0 > . 1:1(0) ack 10001 <nop,nop,TS val 200 ecr 700>22 23// We read 1K and we should have 9K ready to read.24 +0 recvmsg(3, {msg_name(...)=...,25 msg_iov(1)=[{..., 1000}],26 msg_flags=0,27 msg_control=[{cmsg_level=SOL_TCP,28 cmsg_type=TCP_CM_INQ,29 cmsg_data=9000}]}, 0) = 100030// We read 9K and we should have no further data ready to read.31 +0 recvmsg(3, {msg_name(...)=...,32 msg_iov(1)=[{..., 9000}],33 msg_flags=0,34 msg_control=[{cmsg_level=SOL_TCP,35 cmsg_type=TCP_CM_INQ,36 cmsg_data=0}]}, 0) = 900037 38// Server sends more data and closes the connections.39 +0 < F. 10001:20001(10000) ack 1 win 51440 +0 > . 1:1(0) ack 20002 <nop,nop,TS val 200 ecr 700>41 42// We read 10K and we should have one "fake" byte because the connection is43// closed.44 +0 recvmsg(3, {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 EOF.51 +0 read(3, ..., 2000) = 052