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. 6// 7// fire two sends with MSG_ZEROCOPY and receive the acks. confirm that EPOLLERR 8// is correctly fired only once, when EPOLLET is set. send another packet with 9// MSG_ZEROCOPY. confirm that EPOLLERR is correctly fired again only once. 10`./defaults.sh` 11 12 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 13 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 14 +0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0 15 +0 bind(3, ..., ...) = 0 16 +0 listen(3, 1) = 0 17 18 +0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7> 19 +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8> 20 +0 < . 1:1(0) ack 1 win 257 21 22 +0 accept(3, ..., ...) = 4 23 24 +0 fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0 25 +0 epoll_create(1) = 5 26 +0 epoll_ctl(5, EPOLL_CTL_ADD, 4, {events=EPOLLOUT|EPOLLET, fd=4}) = 0 27 +0 epoll_wait(5, {events=EPOLLOUT, fd=4}, 1, 0) = 1 28 29 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000 30 +0 > P. 1:4001(4000) ack 1 31 +0 < . 1:1(0) ack 4001 win 257 32 33 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000 34 +0 > P. 4001:8001(4000) ack 1 35 +0 < . 1:1(0) ack 8001 win 257 36 37// receive only one EPOLLERR for the two sends above. 38 +0 epoll_wait(5, {events=EPOLLERR|EPOLLOUT, fd=4}, 1, 0) = 1 39 +0 epoll_wait(5, {events=0, ptr=0}, 1, 0) = 0 40 41 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000 42 +0 > P. 8001:12001(4000) ack 1 43 +0 < . 1:1(0) ack 12001 win 257 44 45// receive only one EPOLLERR for the third send above. 46 +0 epoll_wait(5, {events=EPOLLERR|EPOLLOUT, fd=4}, 1, 0) = 1 47 +0 epoll_wait(5, {events=0, ptr=0}, 1, 0) = 0 48 49 +0 recvmsg(4, {msg_name(...)=..., 50 msg_iov(1)=[{...,0}], 51 msg_flags=MSG_ERRQUEUE, 52 msg_control=[ 53 {cmsg_level=CMSG_LEVEL_IP, 54 cmsg_type=CMSG_TYPE_RECVERR, 55 cmsg_data={ee_errno=0, 56 ee_origin=SO_EE_ORIGIN_ZEROCOPY, 57 ee_type=0, 58 ee_code=SO_EE_CODE_ZEROCOPY_COPIED, 59 ee_info=0, 60 ee_data=2}} 61 ]}, MSG_ERRQUEUE) = 0 62