62 lines
2.3 KiB
Plaintext
62 lines
2.3 KiB
Plaintext
// SPDX-License-Identifier: GPL-2.0
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// epoll zerocopy test:
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//
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// EPOLLERR is known to be not edge-triggered unlike EPOLLIN and EPOLLOUT but
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// it is not level-triggered either.
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//
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// fire two sends with MSG_ZEROCOPY and receive the acks. confirm that EPOLLERR
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// is correctly fired only once, when EPOLLET is set. send another packet with
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// MSG_ZEROCOPY. confirm that EPOLLERR is correctly fired again only once.
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`./defaults.sh`
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0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
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+0 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
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+0 setsockopt(3, SOL_SOCKET, SO_ZEROCOPY, [1], 4) = 0
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+0 bind(3, ..., ...) = 0
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+0 listen(3, 1) = 0
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+0 < S 0:0(0) win 32792 <mss 1000,sackOK,nop,nop,nop,wscale 7>
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+0 > S. 0:0(0) ack 1 <mss 1460,nop,nop,sackOK,nop,wscale 8>
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+0 < . 1:1(0) ack 1 win 257
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+0 accept(3, ..., ...) = 4
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+0 fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0
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+0 epoll_create(1) = 5
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+0 epoll_ctl(5, EPOLL_CTL_ADD, 4, {events=EPOLLOUT|EPOLLET, fd=4}) = 0
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+0 epoll_wait(5, {events=EPOLLOUT, fd=4}, 1, 0) = 1
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+0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
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+0 > P. 1:4001(4000) ack 1
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+0 < . 1:1(0) ack 4001 win 257
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+0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
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+0 > P. 4001:8001(4000) ack 1
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+0 < . 1:1(0) ack 8001 win 257
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// receive only one EPOLLERR for the two sends above.
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+0 epoll_wait(5, {events=EPOLLERR|EPOLLOUT, fd=4}, 1, 0) = 1
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+0 epoll_wait(5, {events=0, ptr=0}, 1, 0) = 0
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+0 send(4, ..., 4000, MSG_ZEROCOPY) = 4000
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+0 > P. 8001:12001(4000) ack 1
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+0 < . 1:1(0) ack 12001 win 257
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// receive only one EPOLLERR for the third send above.
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+0 epoll_wait(5, {events=EPOLLERR|EPOLLOUT, fd=4}, 1, 0) = 1
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+0 epoll_wait(5, {events=0, ptr=0}, 1, 0) = 0
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+0 recvmsg(4, {msg_name(...)=...,
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msg_iov(1)=[{...,0}],
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msg_flags=MSG_ERRQUEUE,
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msg_control=[
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{cmsg_level=CMSG_LEVEL_IP,
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cmsg_type=CMSG_TYPE_RECVERR,
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cmsg_data={ee_errno=0,
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ee_origin=SO_EE_ORIGIN_ZEROCOPY,
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ee_type=0,
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ee_code=SO_EE_CODE_ZEROCOPY_COPIED,
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ee_info=0,
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ee_data=2}}
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]}, MSG_ERRQUEUE) = 0
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