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)
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