tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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