1// SPDX-License-Identifier: GPL-2.0 2// Test TCP_INQ and TCP_CM_INQ on the client side. 3`./defaults.sh 4` 5 6// Create a socket and set it to non-blocking. 7 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 8 +0 fcntl(3, F_GETFL) = 0x2 (flags O_RDWR) 9 +0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 10 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) = 0 14 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 514 21 +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) = 1000 30// 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) = 9000 37 38// Server sends more data and closes the connections. 39 +0 < F. 10001:20001(10000) ack 1 win 514 40 +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 is 43// 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) = 10000 50// Now, receive EOF. 51 +0 read(3, ..., 2000) = 0 52