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1// SPDX-License-Identifier: GPL-2.02// epoll zerocopy test:3//4// EPOLLERR is known to be not edge-triggered unlike EPOLLIN and EPOLLOUT but5// it is not level-triggered either. this tests verify that the same behavior is6// maintained when we have EPOLLEXCLUSIVE.7//8// fire two sends with MSG_ZEROCOPY and receive the acks. confirm that EPOLLERR9// is correctly fired only once, when EPOLLET is set. send another packet with10// MSG_ZEROCOPY. confirm that EPOLLERR is correctly fired again only once.11`./defaults.sh`12 13 0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 314 +0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 015 +0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 016 +0 bind(3, ..., ...) = 017 +0 listen(3, 1) = 018 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 25722 23 +0 accept(3, ..., ...) = 424 25 +0 fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 026 +0 epoll_create(1) = 527 +0 epoll_ctl(5, EPOLL_CTL_ADD, 4,28 {events=EPOLLOUT|EPOLLET|EPOLLEXCLUSIVE, fd=4}) = 029 +0 epoll_wait(5, {events=EPOLLOUT, fd=4}, 1, 0) = 130 31 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 400032 +0 > P. 1:4001(4000) ack 133 +0 < . 1:1(0) ack 4001 win 25734 35 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 400036 +0 > P. 4001:8001(4000) ack 137 +0 < . 1:1(0) ack 8001 win 25738 39// receive only one EPOLLERR for the two sends above.40 +0 epoll_wait(5, {events=EPOLLERR|EPOLLOUT, fd=4}, 1, 0) = 141 +0 epoll_wait(5, {events=0, ptr=0}, 1, 0) = 042 43 +0 send(4, ..., 4000, MSG_ZEROCOPY) = 400044 +0 > P. 8001:12001(4000) ack 145 +0 < . 1:1(0) ack 12001 win 25746 47// receive only one EPOLLERR for the third send above.48 +0 epoll_wait(5, {events=EPOLLERR|EPOLLOUT, fd=4}, 1, 0) = 149 +0 epoll_wait(5, {events=0, ptr=0}, 1, 0) = 050 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) = 064