An AIO control block structure aiocb is used in many asynchronous I/O functions. It is defined in <aio.h> The AIO control block structure aiocb has following members: int aio_fildes off_t aio_offset volatile void* aio_buf size_t aio_nbytes int aio_reqprio struct sigevent aio_sigevent int aio_lio_opcode The header <aio.h> shakk include following constants: AIO_ALLDONE AIO_CANCELED AIO_NOTCANCELED LIO_NOP LIO_NOWAIT LIO_READ LIO_WAIT LIO_WRITE The header <aio.h> shall defines following functions or macros: int aio_cancel(int, struct aiocb *); int aio_error(const struct aiocb *); int aio_fsync(int, struct aiocb *); int aio_read(struct aiocb *); ssize_t aio_return(struct aiocb *); int aio_suspend(const struct aiocb *const[], int, const struct timespec *); int aio_write(struct aiocb *); int lio_listio(int, struct aiocb *restrict const[restrict], int, struct sigevent *restrict);