Provided by: libaio-dev_0.3.110-2_amd64 
NAME
io_fsync - Synchronize a file's complete in-core state with that on disk
SYNOPSYS
#include <errno.h> #include <libaio.h> int io_fsync(io_context_t ctx, struct iocb *iocb, io_callback_t cb, int fd); 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);
DESCRIPTION
When dealing with asynchronous operations it is sometimes necessary to get into a consistent state. This
would mean for AIO that one wants to know whether a certain request or a group of request were processed.
This could be done by waiting for the notification sent by the system after the operation terminated, but
this sometimes would mean wasting resources (mainly computation time).
Calling this function forces all I/O operations operating queued at the time of the function call
operating on the file descriptor iocb->io_fildes into the synchronized I/O completion state . The
io_fsync function returns immediately but the notification through the method described in io_callback
will happen only after all requests for this file descriptor have terminated and the file is
synchronized. This also means that requests for this very same file descriptor which are queued after
the synchronization request are not affected.
RETURN VALUES
Returns 0, otherwise returns errno.
ERRORS
EFAULT iocbs referenced data outside of the program's accessible address space.
EINVAL ctx refers to an unitialized aio context, the iocb pointed to by iocbs contains an improperly
initialized iocb,
EBADF The iocb contains a file descriptor that does not exist.
EINVAL The file specified in the iocb does not support the given io operation.
SEE ALSO
io(3), io_cancel(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).