Jens Axboe | cb1e01a | 2019-04-25 09:58:55 -0600 | [diff] [blame^] | 1 | /* |
| 2 | * Description: -EAGAIN handling |
| 3 | * |
| 4 | */ |
| 5 | #include <errno.h> |
| 6 | #include <stdio.h> |
| 7 | #include <unistd.h> |
| 8 | #include <stdlib.h> |
| 9 | #include <string.h> |
| 10 | #include <fcntl.h> |
| 11 | |
| 12 | #include "../src/liburing.h" |
| 13 | |
| 14 | static int get_file_fd(void) |
| 15 | { |
| 16 | char *buf; |
| 17 | int fd; |
| 18 | |
| 19 | fd = open("testfile", O_RDWR | O_CREAT, 0644); |
| 20 | if (fd < 0) { |
| 21 | perror("open file"); |
| 22 | return -1; |
| 23 | } |
| 24 | |
| 25 | buf = malloc(4096); |
| 26 | write(fd, buf, 4096); |
| 27 | fsync(fd); |
| 28 | |
| 29 | if (posix_fadvise(fd, 0, 4096, POSIX_FADV_DONTNEED)) { |
| 30 | perror("fadvise"); |
| 31 | close(fd); |
| 32 | free(buf); |
| 33 | return -1; |
| 34 | } |
| 35 | |
| 36 | free(buf); |
| 37 | return fd; |
| 38 | } |
| 39 | |
| 40 | static void put_file_fd(int fd) |
| 41 | { |
| 42 | close(fd); |
| 43 | unlink("testfile"); |
| 44 | } |
| 45 | |
| 46 | int main(int argc, char *argv[]) |
| 47 | { |
| 48 | struct io_uring ring; |
| 49 | struct io_uring_sqe *sqe; |
| 50 | struct iovec iov; |
| 51 | int ret, fd; |
| 52 | |
| 53 | iov.iov_base = malloc(4096); |
| 54 | iov.iov_len = 4096; |
| 55 | |
| 56 | ret = io_uring_queue_init(2, &ring, 0); |
| 57 | if (ret) { |
| 58 | printf("ring setup failed\n"); |
| 59 | return 1; |
| 60 | |
| 61 | } |
| 62 | |
| 63 | sqe = io_uring_get_sqe(&ring); |
| 64 | if (!sqe) { |
| 65 | printf("get sqe failed\n"); |
| 66 | return 1; |
| 67 | } |
| 68 | |
| 69 | fd = get_file_fd(); |
| 70 | if (fd < 0) |
| 71 | return 1; |
| 72 | |
| 73 | io_uring_prep_readv(sqe, fd, &iov, 1, 0); |
| 74 | sqe->rw_flags = RWF_NOWAIT; |
| 75 | |
| 76 | ret = io_uring_submit(&ring); |
| 77 | if (ret != -EAGAIN) { |
| 78 | printf("Got submit %d, expected EAGAIN\n", ret); |
| 79 | goto err; |
| 80 | } |
| 81 | |
| 82 | put_file_fd(fd); |
| 83 | return 0; |
| 84 | err: |
| 85 | put_file_fd(fd); |
| 86 | return 1; |
| 87 | } |