dll.c

#include <aio.h>
#include <fcntl.h>
#include <string.h>

int async_read(int file, char* buffer, size_t size, off_t offset)
{
    struct aiocb cb;
    memset(&cb, 0, sizeof(struct aiocb));
    cb.aio_fildes = file;
    cb.aio_offset = offset;
    cb.aio_nbytes = size;
    cb.aio_lio_opcode = LIO_READ;
    cb.aio_buf = buffer;
    struct sigevent se;
    se.sigev_notify = SIGEV_NONE;
    cb.aio_sigevent = se;

    aio_read(&cb);

    while (aio_error(&cb) != 0)
        ;

    return aio_return(&cb);
}

int async_write(int file, char* buffer, size_t size, off_t offset)
{
    struct aiocb cb;
    memset(&cb, 0, sizeof(struct aiocb));
    cb.aio_fildes = file;
    cb.aio_offset = offset;
    cb.aio_nbytes = size;
    cb.aio_lio_opcode = LIO_WRITE;
    cb.aio_buf = buffer;
    struct sigevent se;
    se.sigev_notify = SIGEV_NONE;
    cb.aio_sigevent = se;

    aio_write(&cb);

    while (aio_error(&cb) != 0)
        ;

    return aio_return(&cb);
}