// SPDX-License-Identifier: GPL-2.0
// Test TCP_INQ and TCP_CM_INQ on the server side.
`./defaults.sh
`
// Initialize connection
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+0 bind(3, ..., ...) = 0
+0 listen(3, 1) = 0
+0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 10>
+0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
+.01 < . 1:1(0) ack 1 win 514
// Accept the connection and enable TCP_INQ.
+0 accept(3, ..., ...) = 4
+0 setsockopt(4, SOL_TCP, TCP_INQ, [1], 4) = 0
// Now we have 10K of data ready on the socket.
+0 < . 1:10001(10000) ack 1 win 514
+0 > . 1:1(0) ack 10001
// We read 2K and we should have 8K ready to read.
+0 recvmsg(4, {msg_name(...)=...,
msg_iov(1)=[{..., 2000}],
msg_flags=0,
msg_control=[{cmsg_level=SOL_TCP,
cmsg_type=TCP_CM_INQ,
cmsg_data=8000}]}, 0) = 2000
// We read 8K and we should have no further data ready to read.
+0 recvmsg(4, {msg_name(...)=...,
msg_iov(1)=[{..., 8000}],
msg_flags=0,
msg_control=[{cmsg_level=SOL_TCP,
cmsg_type=TCP_CM_INQ,
cmsg_data=0}]}, 0) = 8000
// Client sends more data and closes the connections.
+0 < F. 10001:20001(10000) ack 1 win 514
+0 > . 1:1(0) ack 20002
// We read 10K and we should have one "fake" byte because the connection is
// closed.
+0 recvmsg(4, {msg_name(...)=...,
msg_iov(1)=[{..., 10000}],
msg_flags=0,
msg_control=[{cmsg_level=SOL_TCP,
cmsg_type=TCP_CM_INQ,
cmsg_data=1}]}, 0) = 10000
// Now, receive error.
+0 read(3, ..., 2000) = -1 ENOTCONN (Transport endpoint is not connected)