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// epoll zerocopy test:
3//
4// EPOLLERR is known to be not edge-triggered unlike EPOLLIN and EPOLLOUT but
5// it is not level-triggered either. this tests verify that the same behavior is
6// maintained when we have EPOLLEXCLUSIVE.
7//
8// fire two sends with MSG_ZEROCOPY and receive the acks. confirm that EPOLLERR
9// is correctly fired only once, when EPOLLET is set. send another packet with
10// MSG_ZEROCOPY. confirm that EPOLLERR is correctly fired again only once.
11`./defaults.sh`
12
13 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
14 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
15 +0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0
16 +0 bind(3, ..., ...) = 0
17 +0 listen(3, 1) = 0
18
19 +0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
20 +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
21 +0 < . 1:1(0) ack 1 win 257
22
23 +0 accept(3, ..., ...) = 4
24
25 +0 fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0
26 +0 epoll_create(1) = 5
27 +0 epoll_ctl(5, EPOLL_CTL_ADD, 4,
28 {events=EPOLLOUT|EPOLLET|EPOLLEXCLUSIVE, fd=4}) = 0
29 +0 epoll_wait(5, {events=EPOLLOUT, fd=4}, 1, 0) = 1
30
31 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
32 +0 > P. 1:4001(4000) ack 1
33 +0 < . 1:1(0) ack 4001 win 257
34
35 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
36 +0 > P. 4001:8001(4000) ack 1
37 +0 < . 1:1(0) ack 8001 win 257
38
39// receive only one EPOLLERR for the two sends above.
40 +0 epoll_wait(5, {events=EPOLLERR|EPOLLOUT, fd=4}, 1, 0) = 1
41 +0 epoll_wait(5, {events=0, ptr=0}, 1, 0) = 0
42
43 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
44 +0 > P. 8001:12001(4000) ack 1
45 +0 < . 1:1(0) ack 12001 win 257
46
47// receive only one EPOLLERR for the third send above.
48 +0 epoll_wait(5, {events=EPOLLERR|EPOLLOUT, fd=4}, 1, 0) = 1
49 +0 epoll_wait(5, {events=0, ptr=0}, 1, 0) = 0
50
51 +0 recvmsg(4, {msg_name(...)=...,
52 msg_iov(1)=[{...,0}],
53 msg_flags=MSG_ERRQUEUE,
54 msg_control=[
55 {cmsg_level=CMSG_LEVEL_IP,
56 cmsg_type=CMSG_TYPE_RECVERR,
57 cmsg_data={ee_errno=0,
58 ee_origin=SO_EE_ORIGIN_ZEROCOPY,
59 ee_type=0,
60 ee_code=SO_EE_CODE_ZEROCOPY_COPIED,
61 ee_info=0,
62 ee_data=2}}
63 ]}, MSG_ERRQUEUE) = 0