1// SPDX-License-Identifier: GPL-2.0 2// Test TCP_INQ and TCP_CM_INQ on the client side. 3 4--mss=1000 5 6`./defaults.sh 7` 8 9// Create a socket and set it to non-blocking. 10 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 11 +0 fcntl(3, F_GETFL) = 0x2 (flags O_RDWR) 12 +0 fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 13 14// Connect to the server and enable TCP_INQ. 15 +0 connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress) 16 +0 setsockopt(3, SOL_TCP, TCP_INQ, [1], 4) = 0 17 18 +0 > S 0:0(0) <mss 1460,sackOK,TS val 100 ecr 0,nop,wscale 8> 19 +.01 < S. 0:0(0) ack 1 win 5792 <mss 1460,sackOK,TS val 700 ecr 100,nop,wscale 7> 20 +0 > . 1:1(0) ack 1 <nop,nop,TS val 200 ecr 700> 21 22// Now we have 10K of data ready on the socket. 23 +0 < . 1:10001(10000) ack 1 win 514 24 +0 > . 1:1(0) ack 10001 <nop,nop,TS val 200 ecr 700> 25 26// We read 1K and we should have 9K ready to read. 27 +0 recvmsg(3, {msg_name(...)=..., 28 msg_iov(1)=[{..., 1000}], 29 msg_flags=0, 30 msg_control=[{cmsg_level=SOL_TCP, 31 cmsg_type=TCP_CM_INQ, 32 cmsg_data=9000}]}, 0) = 1000 33// We read 9K and we should have no further data ready to read. 34 +0 recvmsg(3, {msg_name(...)=..., 35 msg_iov(1)=[{..., 9000}], 36 msg_flags=0, 37 msg_control=[{cmsg_level=SOL_TCP, 38 cmsg_type=TCP_CM_INQ, 39 cmsg_data=0}]}, 0) = 9000 40 41// Server sends more data and closes the connections. 42 +0 < F. 10001:20001(10000) ack 1 win 514 43 +0 > . 1:1(0) ack 20002 <nop,nop,TS val 200 ecr 700> 44 45// We read 10K and we should have one "fake" byte because the connection is 46// closed. 47 +0 recvmsg(3, {msg_name(...)=..., 48 msg_iov(1)=[{..., 10000}], 49 msg_flags=0, 50 msg_control=[{cmsg_level=SOL_TCP, 51 cmsg_type=TCP_CM_INQ, 52 cmsg_data=1}]}, 0) = 10000 53// Now, receive EOF. 54 +0 read(3, ..., 2000) = 0 55