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// send with MSG_ZEROCOPY on a non-established socket
3//
4// verify that a send in state TCP_CLOSE correctly aborts the zerocopy
5// operation, specifically it does not increment the zerocopy counter.
6//
7// First send on a closed socket and wait for (absent) notification.
8// Then connect and send and verify that notification nr. is zero.
9
10`./defaults.sh`
11
12 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 4
13 +0 setsockopt(4, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0
14
15 +0 send(4, ..., 4000, MSG_ZEROCOPY) = -1 EPIPE (Broken pipe)
16
17 +0.1 recvmsg(4, {msg_name(...)=...,
18 msg_iov(1)=[{...,0}],
19 msg_flags=MSG_ERRQUEUE,
20 msg_control=[]}, MSG_ERRQUEUE) = -1 EAGAIN (Resource temporarily unavailable)
21
22 +0...0 connect(4, ..., ...) = 0
23
24 +0 > S 0:0(0) <mss 1460,sackOK,TS val 0 ecr 0,nop,wscale 8>
25 +0 < S. 0:0(0) ack 1 win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
26 +0 > . 1:1(0) ack 1
27
28 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
29 +0 > P. 1:4001(4000) ack 1
30 +0 < . 1:1(0) ack 4001 win 257
31
32 +0 recvmsg(4, {msg_name(...)=...,
33 msg_iov(1)=[{...,0}],
34 msg_flags=MSG_ERRQUEUE,
35 msg_control=[
36 {cmsg_level=CMSG_LEVEL_IP,
37 cmsg_type=CMSG_TYPE_RECVERR,
38 cmsg_data={ee_errno=0,
39 ee_origin=SO_EE_ORIGIN_ZEROCOPY,
40 ee_type=0,
41 ee_code=SO_EE_CODE_ZEROCOPY_COPIED,
42 ee_info=0,
43 ee_data=0}}
44 ]}, MSG_ERRQUEUE) = 0