113 lines
2.2 KiB
C
113 lines
2.2 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Simple app that demonstrates how to setup an io_uring interface,
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* submit and complete IO against it, and then tear it down.
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*
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* gcc -Wall -O2 -D_GNU_SOURCE -o io_uring-test io_uring-test.c -luring
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*/
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#include <stdio.h>
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#include <fcntl.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "liburing.h"
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#define QD 4
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int main(int argc, char *argv[])
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{
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struct io_uring ring;
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int i, fd, ret, pending, done;
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struct io_uring_sqe *sqe;
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struct io_uring_cqe *cqe;
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struct iovec *iovecs;
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struct stat sb;
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ssize_t fsize;
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off_t offset;
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void *buf;
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if (argc < 2) {
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printf("%s: file\n", argv[0]);
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return 1;
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}
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ret = io_uring_queue_init(QD, &ring, 0);
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if (ret < 0) {
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fprintf(stderr, "queue_init: %s\n", strerror(-ret));
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return 1;
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}
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fd = open(argv[1], O_RDONLY | O_DIRECT);
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if (fd < 0) {
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perror("open");
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return 1;
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}
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if (fstat(fd, &sb) < 0) {
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perror("fstat");
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return 1;
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}
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fsize = 0;
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iovecs = calloc(QD, sizeof(struct iovec));
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for (i = 0; i < QD; i++) {
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if (posix_memalign(&buf, 4096, 4096))
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return 1;
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iovecs[i].iov_base = buf;
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iovecs[i].iov_len = 4096;
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fsize += 4096;
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}
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offset = 0;
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i = 0;
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do {
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sqe = io_uring_get_sqe(&ring);
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if (!sqe)
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break;
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io_uring_prep_readv(sqe, fd, &iovecs[i], 1, offset);
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offset += iovecs[i].iov_len;
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i++;
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if (offset > sb.st_size)
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break;
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} while (1);
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ret = io_uring_submit(&ring);
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if (ret < 0) {
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fprintf(stderr, "io_uring_submit: %s\n", strerror(-ret));
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return 1;
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} else if (ret != i) {
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fprintf(stderr, "io_uring_submit submitted less %d\n", ret);
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return 1;
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}
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done = 0;
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pending = ret;
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fsize = 0;
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for (i = 0; i < pending; i++) {
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ret = io_uring_wait_cqe(&ring, &cqe);
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if (ret < 0) {
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fprintf(stderr, "io_uring_wait_cqe: %s\n", strerror(-ret));
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return 1;
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}
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done++;
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ret = 0;
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if (cqe->res != 4096 && cqe->res + fsize != sb.st_size) {
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fprintf(stderr, "ret=%d, wanted 4096\n", cqe->res);
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ret = 1;
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}
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fsize += cqe->res;
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io_uring_cqe_seen(&ring, cqe);
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if (ret)
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break;
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}
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printf("Submitted=%d, completed=%d, bytes=%lu\n", pending, done,
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(unsigned long) fsize);
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close(fd);
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io_uring_queue_exit(&ring);
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return 0;
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}
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