| /* SPDX-License-Identifier: MIT */ |
| #include <errno.h> |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <fcntl.h> |
| #include <sys/types.h> |
| |
| #include "helpers.h" |
| #include "liburing.h" |
| |
| #define IOVECS_LEN 2 |
| |
| int main(int argc, char *argv[]) |
| { |
| struct iovec iovecs[IOVECS_LEN]; |
| struct io_uring ring; |
| int i, fd, ret; |
| |
| if (argc > 1) |
| return 0; |
| |
| fd = open("/dev/zero", O_RDONLY); |
| if (fd < 0) { |
| fprintf(stderr, "Failed to open /dev/zero\n"); |
| return 1; |
| } |
| |
| if (io_uring_queue_init(32, &ring, 0) < 0) { |
| fprintf(stderr, "Faild to init io_uring\n"); |
| close(fd); |
| return 1; |
| } |
| |
| for (i = 0; i < IOVECS_LEN; ++i) { |
| iovecs[i].iov_base = t_malloc(64); |
| iovecs[i].iov_len = 64; |
| }; |
| |
| ret = io_uring_register_buffers(&ring, iovecs, IOVECS_LEN); |
| if (ret) { |
| fprintf(stderr, "Failed to register buffers\n"); |
| return 1; |
| } |
| |
| for (i = 0; i < IOVECS_LEN; ++i) { |
| struct io_uring_sqe *sqe = io_uring_get_sqe(&ring); |
| const char *str = "#include <errno.h>"; |
| |
| iovecs[i].iov_len = strlen(str); |
| io_uring_prep_read_fixed(sqe, fd, iovecs[i].iov_base, strlen(str), 0, i); |
| if (i == 0) |
| io_uring_sqe_set_flags(sqe, IOSQE_IO_LINK); |
| io_uring_sqe_set_data(sqe, (void *)str); |
| } |
| |
| ret = io_uring_submit_and_wait(&ring, IOVECS_LEN); |
| if (ret < 0) { |
| fprintf(stderr, "Failed to submit IO\n"); |
| return 1; |
| } else if (ret < 2) { |
| fprintf(stderr, "Submitted %d, wanted %d\n", ret, IOVECS_LEN); |
| return 1; |
| } |
| |
| for (i = 0; i < IOVECS_LEN; i++) { |
| struct io_uring_cqe *cqe; |
| |
| ret = io_uring_wait_cqe(&ring, &cqe); |
| if (ret) { |
| fprintf(stderr, "wait_cqe=%d\n", ret); |
| return 1; |
| } |
| if (cqe->res != iovecs[i].iov_len) { |
| fprintf(stderr, "read: wanted %ld, got %d\n", |
| (long) iovecs[i].iov_len, cqe->res); |
| return 1; |
| } |
| io_uring_cqe_seen(&ring, cqe); |
| } |
| |
| close(fd); |
| io_uring_queue_exit(&ring); |
| |
| for (i = 0; i < IOVECS_LEN; ++i) |
| free(iovecs[i].iov_base); |
| |
| return 0; |
| } |