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AIO_FSYNC(P) AIO_FSYNC(P)
NAME
aio_fsync - asynchronous file synchronization (REALTIME)
SYNOPSIS
#include <aio.h>
int aio_fsync(int op, struct aiocb *aiocbp);
DESCRIPTION
The aio_fsync() function shall asynchronously force all I/O operations associated
with the file indicated by the file descriptor aio_fildes member 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 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).
If op is O_DSYNC, all currently queued I/O operations shall be completed as if by a
call to fdatasync(); that is, as defined for synchronized I/O data integrity com-
pletion. If op is O_SYNC, 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 aio_fsync() function fails, or if the operation queued by
aio_fsync() fails, then, as for fsync() and fdatasync(), 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() and aio_return() in order to determine
the error status and return status, respectively, of the asynchronous operation
while it is proceeding. When the request is queued, the error status for the opera-
tion is [EINPROGRESS]. When all data has been successfully transferred, the error
status shall be reset to reflect the success or failure of the operation. If the
operation does not complete successfully, the error status for the operation shall
be set to indicate the error. The aio_sigevent member determines the asynchronous
notification to occur as specified in Signal Generation and Delivery when all oper-
ations have achieved synchronized I/O completion. All other members of the struc-
ture 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 aiocbp indicates an error condition, data is
not guaranteed to have been successfully transferred.
RETURN VALUE
The aio_fsync() function shall return the value 0 to the calling process if the I/O
operation is successfully queued; otherwise, the function shall return the value -1
and set errno to indicate the error.
ERRORS
The aio_fsync() function shall 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 argu-
ment is not a valid file descriptor open for writing.
EINVAL This implementation 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() shall return
the error condition defined for read() and write(). The error is returned in the
error status for the asynchronous fsync() operation, which can be retrieved using
aio_error().
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
The aio_fsync() function is part of the Asynchronous Input and Output option and
need not be available on all implementations.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
fcntl() , fdatasync() , fsync() , open() , read() , write() , the Base Definitions
volume of IEEE Std 1003.1-2001, <aio.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating
System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C)
2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The
Open Group. In the event of any discrepancy between this version and the original
IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is
the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
POSIX 2003 AIO_FSYNC(P)
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