1 /* SPDX-License-Identifier: MIT */
2 #include <errno.h>
3 #include <stdio.h>
4 #include <unistd.h>
5 #include <stdlib.h>
6 #include <string.h>
7 #include <fcntl.h>
8 #include <sys/types.h>
9 #include <poll.h>
10
11
12 #include "helpers.h"
13 #include "liburing.h"
14
15 #define BUF_SIZE 4096
16 #define FILE_SIZE 1024
17
main(int argc,char * argv[])18 int main(int argc, char *argv[])
19 {
20 int ret, fd, save_errno;
21 struct io_uring ring;
22 struct io_uring_sqe *sqe;
23 struct io_uring_cqe *cqe;
24 struct iovec vec;
25
26 if (argc > 1)
27 return 0;
28
29 vec.iov_base = t_malloc(BUF_SIZE);
30 vec.iov_len = BUF_SIZE;
31
32 t_create_file(".short-read", FILE_SIZE);
33
34 fd = open(".short-read", O_RDONLY);
35 save_errno = errno;
36 unlink(".short-read");
37 errno = save_errno;
38 if (fd < 0) {
39 perror("file open");
40 return 1;
41 }
42
43 ret = io_uring_queue_init(32, &ring, 0);
44 if (ret) {
45 fprintf(stderr, "queue init failed: %d\n", ret);
46 return ret;
47 }
48
49 sqe = io_uring_get_sqe(&ring);
50 if (!sqe) {
51 fprintf(stderr, "sqe get failed\n");
52 return 1;
53 }
54 io_uring_prep_readv(sqe, fd, &vec, 1, 0);
55
56 ret = io_uring_submit(&ring);
57 if (ret != 1) {
58 fprintf(stderr, "submit failed: %d\n", ret);
59 return 1;
60 }
61
62 ret = io_uring_wait_cqes(&ring, &cqe, 1, 0, 0);
63 if (ret) {
64 fprintf(stderr, "wait_cqe failed: %d\n", ret);
65 return 1;
66 }
67
68 if (cqe->res != FILE_SIZE) {
69 fprintf(stderr, "Read failed: %d\n", cqe->res);
70 return 1;
71 }
72
73 io_uring_cqe_seen(&ring, cqe);
74 return 0;
75 }
76