1// SPDX-License-Identifier: GPL-2.0 2// Test TCP_INQ and TCP_CM_INQ on the server side. 3`./defaults.sh 4` 5 6// Initialize connection 7 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 8 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 9 +0 bind(3, ..., ...) = 0 10 +0 listen(3, 1) = 0 11 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 514 15 16// Accept the connection and enable TCP_INQ. 17 +0 accept(3, ..., ...) = 4 18 +0 setsockopt(4, SOL_TCP, TCP_INQ, [1], 4) = 0 19 20// Now we have 10K of data ready on the socket. 21 +0 < . 1:10001(10000) ack 1 win 514 22 +0 > . 1:1(0) ack 10001 23 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) = 2000 31// 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) = 8000 38// Client sends more data and closes the connections. 39 +0 < F. 10001:20001(10000) ack 1 win 514 40 +0 > . 1:1(0) ack 20002 41 42// We read 10K and we should have one "fake" byte because the connection is 43// 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) = 10000 50// Now, receive error. 51 +0 read(3, ..., 2000) = -1 ENOTCONN (Transport endpoint is not connected) 52