NAME
io_prep_fsync - Synchronize a file’s complete in-core state with that
on disk
SYNOPSYS
#include <errno.h>
#include <libaio.h>
static inline void io_prep_fsync(struct iocb *iocb, int fd);
struct iocb {
void *data;
unsigned key;
short aio_lio_opcode;
short aio_reqprio;
int aio_fildes;
};
DESCRIPTION
This is an inline convenience function for setting up an iocbv for a
FSYNC request.
The file for which
iocb->aio_fildes = fd
is a descriptor is set up with the command
iocb->aio_lio_opcode = IO_CMD_FSYNC
The io_prep_fsync() function shall set up an IO_CMD_FSYNC operation to
asynchronously force all I/O operations associated with the file
indicated by the file descriptor aio_fildes member of the iocb
structure referenced by the iocb argument and queued at the time of the
call to io_submit() to the synchronized I/O completion state. The
function call shall return when the synchronization request has been
initiated or queued to the file or device (even when the data cannot be
synchronized immediately).
All currently queued I/O operations shall be completed as if by a call
to fsync(); that is, as defined for synchronized I/O file integrity
completion. If the operation queued by io_prep_fsync() fails, then, as
for fsync(), outstanding I/O operations are not guaranteed to have been
completed.
If io_prep_fsync() succeeds, then it is only the I/O that was queued at
the time of the call to io_submit() that is guaranteed to be forced to
the relevant completion state. The completion of subsequent I/O on the
file descriptor is not guaranteed to be completed in a synchronized
fashion.
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_pread(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).