SYNOPSIS
#include <errno.h>
#include <libaio.h>
static inline void io_set_callback(struct iocb *iocb, io_callback_t cb);
struct iocb {
void *data;
unsigned key;
short aio_lio_opcode;
short aio_reqprio;
int aio_fildes;
};
typedef void (*io_callback_t)(io_context_t ctx, struct iocb *iocb, long res, long res2);