AIO_FSYNC(3) | Library Functions Manual | AIO_FSYNC(3) |
aio_fsync
—
#include <aio.h>
int
aio_fsync
(int
op, struct aiocb
*aiocbp);
aio_fsync
() system call allows the calling process
to force all modified data associated with the file descriptor
aiocbp->aio_fildes to be flushed to the stable
storage device. The call returns immediately after the synchronization request
has been enqueued to the descriptor; the synchronization may or may not have
completed at the time the call returns. If the request could not be enqueued,
generally due to invalid arguments, the call returns without having enqueued
the request.
The op argument could be set only to
O_DSYNC
or O_SYNC
. If
op is O_DSYNC
, then
aio_fsync
() does the same as a
fdatasync
() call, if O_SYNC
,
then the same as fsync
().
If _POSIX_PRIORITIZED_IO
is defined, and
the descriptor supports it, then the enqueued operation is submitted at a
priority equal to that of the calling process minus
aiocbp->aio_reqprio.
The aiocbp pointer may be subsequently used
as an argument to aio_return
() and
aio_error
() in order to determine return or error
status for the enqueued operation while it is in progress.
aio_fsync
() function returns the value 0 if
successful; otherwise the value -1 is returned and the global variable
errno is set to indicate the error.
aio_fsync
() system call will fail if:
EAGAIN
]The following conditions may be synchronously detected when the
aio_fsync
() system call is made, or asynchronously,
at any time thereafter. If they are detected at call time,
aio_fsync
() returns -1 and sets
errno appropriately; otherwise the
aio_return
() system call must be called, and will
return -1, and aio_error
() must be called to
determine the actual value that would have been returned in
errno.
aio_fsync
() system call is expected to conform to
the IEEE Std 1003.1-2001 (“POSIX.1”)
standard.
aio_fsync
() system call first appeared in
NetBSD 5.0.
May 17, 2010 | NetBSD 9.2 |