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 that we correctly skip zero-length IOVs.
3
4--send_omit_free // do not reuse send buffers with zerocopy
5
6`./defaults.sh`
7
8 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
9 +0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0
10 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
11 +0 bind(3, ..., ...) = 0
12 +0 listen(3, 1) = 0
13
14 +0 < S 0:0(0) win 32792 <mss 1000,nop,wscale 7>
15 +0 > S. 0:0(0) ack 1 <mss 1460,nop,wscale 8>
16 +.01 < . 1:1(0) ack 1 win 257
17 +0 accept(3, ..., ...) = 4
18 +0 setsockopt(4, SOL_TCP, TCP_NODELAY, [1], 4) = 0
19
20 +0 sendmsg(4, {msg_name(...)=...,
21 msg_iov(4)=[{..., 0}, {..., 40}, {..., 0}, {..., 20}],
22 msg_flags=0}, 0) = 60
23 +0 > P. 1:61(60) ack 1
24 +.01 < . 1:1(0) ack 61 win 257
25
26 +0 sendmsg(4, {msg_name(...)=...,
27 msg_iov(4)=[{..., 0}, {..., 0}, {..., 0}, {..., 0}],
28 msg_flags=0}, MSG_ZEROCOPY) = 0
29
30 +0 sendmsg(4, {msg_name(...)=...,
31 msg_iov(4)=[{..., 0}, {..., 10}, {..., 0}, {..., 50}],
32 msg_flags=0}, MSG_ZEROCOPY) = 60
33 +0 > P. 61:121(60) ack 1
34 +.01 < . 1:1(0) ack 121 win 257