io_set_callback(3) [debian man page]

io_set_callback(3)						       Linux							io_set_callback(3)

NAME

       io_set_callback - Set up io completion callback function

SYNOPSYS

       #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);

DESCRIPTION

       The callback is not done if the caller uses raw events from io_getevents, only with the library helpers.

RETURN VALUES

       None.

ERRORS

       None.

SEE ALSO

       io(3),	 io_cancel(3),	  io_fsync(3),	 io_getevents(3),   io_prep_fsync(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_submit(3), errno(3).

Linux 2.4							    2009-06-10							io_set_callback(3)

io_prep_fsync(3)						       Linux							  io_prep_fsync(3)

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 synchro-
       nized 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).

Linux 2.4							    2009-06-10							  io_prep_fsync(3)