| 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 9.4 |