linux c/c++异步io

#include <aio.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define BUFFER_SIZE 1024

void async_read(int fd, char *buffer, off_t offset) {
    struct aiocb aio;
    memset(&aio, 0, sizeof(aio));
    aio.aio_fildes = fd;
    aio.aio_offset = offset;
    aio.aio_buf = buffer;
    aio.aio_nbytes = BUFFER_SIZE;

    if (aio_read(&aio) == -1) {
        perror("aio_read");
        exit(EXIT_FAILURE);
    }
}

void check_completion(struct aiocb *aio) {
    int ret = aio_error(aio);
    if (ret == 0) {
        printf("Read completed: %ld bytes\n", aio_return(aio));
    } else {
        perror("aio_error");
    }
}

int main() {
    int fd = open("testfile.txt", O_RDONLY);
    if (fd == -1) {
        perror("open");
        exit(EXIT_FAILURE);
    }

    char buffer[BUFFER_SIZE];
    async_read(fd, buffer, 0);

    // Do other work here...

    check_completion(&((struct aiocb){.aio_fildes = fd}));

    close(fd);
    return 0;
}