aio_fsync(2) System Calls Manual aio_fsync(2)
NAME
aio_fsync() - force outstanding asynchronous operations on a file to the synchronized state
SYNOPSIS
DESCRIPTION
The function asynchronously forces all I/O operations that are enqueued at the time of the call for the file or device referenced by to the
synchronized I/O state. The function call returns when the synchronization request has been enqueued to the file or device (even when the
data cannot be synchronized immediately).
Successful completion of the request indicates that all modified data for has been moved to a permanent storage device. The function
affects only those asynchronous I/O operations enqueued at the time of the call. Subsequently enqueued operations are not included in the
synchronizing operation.
The function supports synchronized I/O for regular files, block special files, and character special files.
If the is all currently enqueued asynchronous I/O operations for are completed as if by a call to All data is forced to permanent storage
but the meta-data (such as modification times) for the file descriptor is not necessarily updated. If the is all currently enqueued asyn-
chronous I/O operations for are completed as if by a call to All data is forced to permanent storage and the file descriptor metadata is
updated.
If an request is issued for a file when there is already a pending request, the first request is treated as though it were part of the sec-
ond, and the second request will not complete until the first has completed.
The function returns when the fsync request has been enqueued for the referenced file or device. The and functions must be used to
retrieve the status of the synchronization operation via the referenced by The status returned will be until the last operation addressed
by the initial request completes. If all operations complete successfully, the error status will be 0 (zero). Otherwise, the error status
will be the error status that will be returned for the read or write operation that failed.
If is a valid signal event structure, then the designated signal will be delivered when the requested synchronization operation completes,
either when all subject requests have completed successfully or when any one of the requests has failed.
To use this function, link in the realtime library by specifying on the compiler or linker command line.
RETURN VALUE
If the function fails, is returned and is set to indicate the error.
ERRORS
If detects one of the following error conditions, is set to the indicated value:
[EAGAIN] The request could not be queued because a per-process or system-wide limit on asynchronous I/O operations or asyn-
chronous threads would have been exceeded.
[EBADF] The is not a valid file descriptor open for writing.
[EINVAL] Synchronized I/O is not supported for the file specified by
[EINVAL] The is not a valid address in the process virtual address space.
[EINVAL] The parameters of the indicated in are invalid.
SEE ALSO
aio_cancel(2), aio_error(2), aio_read(2), aio_return(2), aio_suspend(2), aio_write(2), fdatasync(2), fsync(2), lio_listio(2), read(2),
write(2), aio(5).
STANDARDS CONFORMANCE
aio_fsync(2)
