120 lines
1.8 KiB
C
120 lines
1.8 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Description: -EAGAIN handling
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*
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*/
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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 "helpers.h"
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#include "liburing.h"
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#define BLOCK 4096
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#ifndef RWF_NOWAIT
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#define RWF_NOWAIT 8
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#endif
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static int get_file_fd(void)
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{
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ssize_t ret;
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char *buf;
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int fd;
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fd = open("testfile", O_RDWR | O_CREAT, 0644);
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if (fd < 0) {
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perror("open file");
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return -1;
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}
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buf = t_malloc(BLOCK);
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ret = write(fd, buf, BLOCK);
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if (ret != BLOCK) {
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if (ret < 0)
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perror("write");
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else
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printf("Short write\n");
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goto err;
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}
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fsync(fd);
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if (posix_fadvise(fd, 0, 4096, POSIX_FADV_DONTNEED)) {
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perror("fadvise");
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err:
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close(fd);
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free(buf);
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return -1;
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}
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free(buf);
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return fd;
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}
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static void put_file_fd(int fd)
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{
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close(fd);
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unlink("testfile");
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}
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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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struct io_uring_sqe *sqe;
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struct io_uring_cqe *cqe;
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struct iovec iov;
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int ret, fd;
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if (argc > 1)
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return 0;
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iov.iov_base = t_malloc(4096);
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iov.iov_len = 4096;
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ret = io_uring_queue_init(2, &ring, 0);
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if (ret) {
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printf("ring setup failed\n");
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return 1;
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}
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sqe = io_uring_get_sqe(&ring);
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if (!sqe) {
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printf("get sqe failed\n");
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return 1;
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}
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fd = get_file_fd();
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if (fd < 0)
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return 1;
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io_uring_prep_readv(sqe, fd, &iov, 1, 0);
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sqe->rw_flags = RWF_NOWAIT;
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ret = io_uring_submit(&ring);
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if (ret != 1) {
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printf("Got submit %d, expected 1\n", ret);
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goto err;
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}
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ret = io_uring_peek_cqe(&ring, &cqe);
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if (ret) {
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printf("Ring peek got %d\n", ret);
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goto err;
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}
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if (cqe->res != -EAGAIN && cqe->res != 4096) {
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printf("cqe error: %d\n", cqe->res);
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goto err;
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}
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put_file_fd(fd);
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return 0;
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err:
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put_file_fd(fd);
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return 1;
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}
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