1 // SPDX-License-Identifier: GPL-2.0
2 // epoll zerocopy test:
4 // This is a test to confirm that EPOLLERR is only fired once for an FD when
5 // EPOLLONESHOT is set.
7 // fire two sends with MSG_ZEROCOPY and receive the acks. confirm that EPOLLERR
8 // is correctly fired only once, when EPOLLONESHOT is set. send another packet
9 // with MSG_ZEROCOPY. confirm that EPOLLERR is not fired. Rearm the FD and
10 // confirm that EPOLLERR is correctly set.
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
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
23 +0 accept(3, ..., ...) = 4
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|EPOLLONESHOT, fd=4}) = 0
30 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
31 +0 > P. 1:4001(4000) ack 1
32 +0 < . 1:1(0) ack 4001 win 257
34 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
35 +0 > P. 4001:8001(4000) ack 1
36 +0 < . 1:1(0) ack 8001 win 257
38 // receive only one EPOLLERR for the two sends above.
39 +0 epoll_wait(5, {events=EPOLLERR|EPOLLOUT, fd=4}, 1, 0) = 1
40 +0 epoll_wait(5, {events=0, ptr=0}, 1, 0) = 0
42 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
43 +0 > P. 8001:12001(4000) ack 1
44 +0 < . 1:1(0) ack 12001 win 257
46 // receive no EPOLLERR for the third send above.
47 +0 epoll_wait(5, {events=0, ptr=0}, 1, 0) = 0
49 // rearm the FD and verify the EPOLLERR is fired again.
50 +0 epoll_ctl(5, EPOLL_CTL_MOD, 4, {events=EPOLLOUT|EPOLLONESHOT, fd=4}) = 0
51 +0 epoll_wait(5, {events=EPOLLERR|EPOLLOUT, fd=4}, 1, 0) = 1
52 +0 epoll_wait(5, {events=0, ptr=0}, 1, 0) = 0
54 +0 recvmsg(4, {msg_name(...)=...,
56 msg_flags=MSG_ERRQUEUE,
58 {cmsg_level=CMSG_LEVEL_IP,
59 cmsg_type=CMSG_TYPE_RECVERR,
60 cmsg_data={ee_errno=0,
61 ee_origin=SO_EE_ORIGIN_ZEROCOPY,
63 ee_code=SO_EE_CODE_ZEROCOPY_COPIED,