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 11--send_omit_free // do not reuse send buffers with zerocopy 12 13`./defaults.sh` 14 15 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3 16 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 17 +0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0 18 +0 bind(3, ..., ...) = 0 19 +0 listen(3, 1) = 0 20 21 +0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7> 22 +0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8> 23 +0 < . 1:1(0) ack 1 win 257 24 25 +0 accept(3, ..., ...) = 4 26 27 +0 fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0 28 +0 epoll_create(1) = 5 29 +0 epoll_ctl(5, EPOLL_CTL_ADD, 4, {events=EPOLLOUT|EPOLLET, fd=4}) = 0 30 +0 epoll_wait(5, {events=EPOLLOUT, fd=4}, 1, 0) = 1 31 32 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000 33 +0 > P. 1:4001(4000) ack 1 34 +0 < . 1:1(0) ack 4001 win 257 35 36 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000 37 +0 > P. 4001:8001(4000) ack 1 38 +0 < . 1:1(0) ack 8001 win 257 39 40// receive only one EPOLLERR for the two sends above. 41 +0 epoll_wait(5, {events=EPOLLERR|EPOLLOUT, fd=4}, 1, 0) = 1 42 +0 epoll_wait(5, {events=0, ptr=0}, 1, 0) = 0 43 44 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000 45 +0 > P. 8001:12001(4000) ack 1 46 +0 < . 1:1(0) ack 12001 win 257 47 48// receive only one EPOLLERR for the third send above. 49 +0 epoll_wait(5, {events=EPOLLERR|EPOLLOUT, fd=4}, 1, 0) = 1 50 +0 epoll_wait(5, {events=0, ptr=0}, 1, 0) = 0 51 52 +0 recvmsg(4, {msg_name(...)=..., 53 msg_iov(1)=[{...,0}], 54 msg_flags=MSG_ERRQUEUE, 55 msg_control=[ 56 {cmsg_level=CMSG_LEVEL_IP, 57 cmsg_type=CMSG_TYPE_RECVERR, 58 cmsg_data={ee_errno=0, 59 ee_origin=SO_EE_ORIGIN_ZEROCOPY, 60 ee_type=0, 61 ee_code=SO_EE_CODE_ZEROCOPY_COPIED, 62 ee_info=0, 63 ee_data=2}} 64 ]}, MSG_ERRQUEUE) = 0 65