ADTarm-ehast-experimentalenumforall-pointer-decayjacob/cs343-translationnew-astnew-ast-unique-exprpthread-emulationqualifiedEnum
Last change
on this file since 66ba544 was
f100a83,
checked in by Thierry Delisle <tdelisle@…>, 4 years ago
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Updated io_uring example to be less hacky
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-
Property mode set to
100644
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File size:
1.4 KB
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Rev | Line | |
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[3a3b2b9] | 1 | #include <fcntl.h> |
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| 2 | #include <liburing.h> |
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| 3 | #include <stdio.h> |
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| 4 | #include <unistd.h> |
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| 5 | |
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| 6 | struct io_uring ring; |
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| 7 | |
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| 8 | int main(int argc, char * argv[]) { |
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| 9 | if(argc != 2) { |
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| 10 | printf("usage: %s FILE - prints file to console.\n", argv[0]); |
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| 11 | return 1; |
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| 12 | } |
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| 13 | |
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| 14 | int fd = open(argv[1], 0); |
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| 15 | if(fd < 0) { |
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| 16 | printf("Could not open file %s.\n", argv[1]); |
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| 17 | return 2; |
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| 18 | } |
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| 19 | |
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| 20 | /* prep the array */ |
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| 21 | char data[512]; |
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| 22 | struct iovec iov = { data, 512 }; |
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| 23 | |
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| 24 | /* init liburing */ |
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| 25 | io_uring_queue_init(256, &ring, 0); |
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| 26 | |
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| 27 | /* declare required structs */ |
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| 28 | struct io_uring_sqe * sqe; |
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| 29 | struct io_uring_cqe * cqe; |
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| 30 | |
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| 31 | /* get an sqe and fill in a READV operation */ |
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| 32 | sqe = io_uring_get_sqe(&ring); |
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| 33 | io_uring_prep_readv(sqe, fd, &iov, 1, 0); |
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| 34 | |
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[f100a83] | 35 | sqe->user_data = data; |
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| 36 | |
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[3a3b2b9] | 37 | /* tell the kernel we have an sqe ready for consumption */ |
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| 38 | io_uring_submit(&ring); |
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| 39 | |
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| 40 | /* wait for the sqe to complete */ |
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| 41 | int ret = io_uring_wait_cqe(&ring, &cqe); |
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[f100a83] | 42 | |
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[3a3b2b9] | 43 | /* read and process cqe event */ |
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[f100a83] | 44 | if(ret == 0) { |
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| 45 | char * out = cqe->user_data; |
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| 46 | signed int len = cqe->res; |
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| 47 | io_uring_cqe_seen(&ring, cqe); |
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| 48 | |
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| 49 | if(len > 0) { |
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| 50 | printf("%.*s", len, out); |
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| 51 | } |
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| 52 | } |
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| 53 | else { |
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| 54 | printf("%d\n", ret); |
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| 55 | io_uring_cqe_seen(&ring, cqe); |
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| 56 | } |
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[3a3b2b9] | 57 | |
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| 58 | io_uring_queue_exit(&ring); |
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| 59 | |
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| 60 | close(fd); |
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| 61 | } |
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