1// SPDX-License-Identifier: GPL-2.0 2// epoll zerocopy test: 3// 4// This is a test to confirm that EPOLLERR is only fired once for an FD when 5// EPOLLONESHOT is set. 6// 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. 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|EPOLLONESHOT, fd=4}) = 0 29 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 33 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 37 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 41 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 45 46// receive no EPOLLERR for the third send above. 47 +0 epoll_wait(5, {events=0, ptr=0}, 1, 0) = 0 48 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 53 54 +0 recvmsg(4, {msg_name(...)=..., 55 msg_iov(1)=[{...,0}], 56 msg_flags=MSG_ERRQUEUE, 57 msg_control=[ 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, 62 ee_type=0, 63 ee_code=SO_EE_CODE_ZEROCOPY_COPIED, 64 ee_info=0, 65 ee_data=2}} 66 ]}, MSG_ERRQUEUE) = 0 67