aio_fsync(3C)						   Standard C Library Functions 					     aio_fsync(3C)

NAME

       aio_fsync - asynchronous file synchronization

SYNOPSIS

       #include <aio.h>

       int aio_fsync(int op, struct aiocb *aiocbp);

DESCRIPTION

       The aio_fsync() function asynchronously forces all I/O operations associated with the file indicated by the file descriptor aio_fildes mem-
       ber of the aiocb structure referenced by the aiocbp argument and queued at the time of the call to aio_fsync() to the synchronized I/O com-
       pletion state. The function call returns when the synchronization request has been initiated or queued to the file or device (even when the
       data cannot be synchronized immediately).

       If op is O_DSYNC, all currently queued I/O operations are completed as if by a call to fdatasync(3C); that is, as defined for  synchronized
       I/O data integrity completion. If op is O_SYNC, all currently queued I/O operations are completed as if by a call to fsync(3C); that is, as
       defined for synchronized I/O file integrity completion. If the aio_fsync() function fails, or if the operation queued by aio_fsync() fails,
       then, as for fsync(3C) and fdatasync(3C), outstanding I/O operations are not guaranteed to have been completed.

       If  aio_fsync() succeeds, then it is only the I/O that was queued at the time of the call to aio_fsync() 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.

       The  aiocbp  argument  refers  to  an  asynchronous  I/O  control  block.  The aiocbp value may be used as an argument to aio_error(3C) and
       aio_return(3C) in order to determine the error status and return status, respectively, of the asynchronous operation while it  is  proceed-
       ing.  When  the	request is queued, the error status for the operation is EINPROGRESS. When all data has been successfully transferred, the
       error status will be reset to reflect the success or failure of the operation. If the operation does not complete successfully,	the  error
       status  for the operation will be set to indicate the error. The aio_sigevent member determines the asynchronous notification to occur when
       all operations have achieved synchronized I/O completion (see signal.h(3HEAD)). All other members of the structure referenced by aiocbp are
       ignored.  If  the  control block referenced by aiocbp becomes an illegal address prior to asynchronous I/O completion, then the behavior is
       undefined.

       If the aio_fsync() function fails or the aiocbp indicates an error condition, data is not guaranteed to have been successfully transferred.

       If aiocbp is NULL, then no status is returned in aiocbp, and no signal is generated upon completion of the operation.

RETURN VALUES

       The aio_fsync() function returns 0 to the calling process if the I/O operation is successfully queued; otherwise, the function  returns	-1
       and sets errno to indicate the error.

ERRORS

       The aio_fsync() function will fail if:

       EAGAIN	 The requested asynchronous operation was not queued due to temporary resource limitations.

       EBADF	 The aio_fildes member of the aiocb structure referenced by the aiocbp argument is not a valid file descriptor open for writing.

       EINVAL	 The system does not support synchronized I/O for this file.

       EINVAL	 A value of op other than O_DSYNC or O_SYNC was specified.

       In  the	event  that  any  of the queued I/O operations fail, aio_fsync() returns the error condition defined for read(2) and write(2). The
       error will be returned in the error status for the asynchronous fsync(3C) operation, which can be retrieved using aio_error(3C).

USAGE

       The aio_fsync() function has a transitional interface for 64-bit file offsets.  See lf64(5).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+
       |Standard		     |See standards(5). 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       fcntl(2),  open(2),  read(2),  write(2),  aio_error(3C),  aio_return(3C),  aio.h(3HEAD),  fcntl.h(3HEAD),  fdatasync(3C),  fsync(3C),  sig-
       nal.h(3HEAD), attributes(5), lf64(5), standards(5)

SunOS 5.11							    5 Feb 2008							     aio_fsync(3C)