NAME
io_prep_pread - Set up asynchronous read
SYNOPSYS
#include <errno.h>
#include <libaio.h>
inline void io_prep_pread(struct iocb *iocb, int fd, void *buf, size_t count, long long offset);
"
struct iocb {
void *data;
unsigned key;
short aio_lio_opcode;
short aio_reqprio;
int aio_fildes;
};
DESCRIPTION
io_prep_pread is an inline convenience function designed to facilitate
the initialization of the iocb for an asynchronous read operation.
The first iocb->u.c.nbytes = count bytes of the file for which
iocb->aio_fildes = fd is a descriptor are written to the buffer
starting at iocb->u.c.buf = buf. Reading starts at the absolute
position ioc->u.c.offset = offset in the file.
This function returns immediately. To schedule the operation, the
function io_submit must be called.
Simultaneous asynchronous operations using the same iocb produce
undefined results.
RETURN VALUES
None.
ERRORS
None.
SEE ALSO
io(3), io_cancel(3), io_fsync(3), io_getevents(3), io_prep_fsync(3),
io_prep_pwrite(3), io_queue_init(3), io_queue_release(3),
io_queue_run(3), io_queue_wait(3), io_set_callback(3), io_submit(3),
errno(3).