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