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aio_fsync(2)
AIO_FSYNC(2) BSD System Calls Manual AIO_FSYNC(2)
NAME
aio_fsync — asynchronous file synchronization (REALTIME)
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <aio.h>
int
aio_fsync(int op, struct aiocb *iocb);
DESCRIPTION
The aio_fsync() system call allows the calling process to move all modi‐
fied data associated with the descriptor iocb->aio_fildes to a permanent
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.
The op argument can only be set to O_SYNC to cause all currently queued
I/O operations to be completed as if by a call to fsync(2).
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 iocb->aio_reqprio.
The iocb 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.
If the request could not be enqueued (generally due to invalid argu‐
ments), the call returns without having enqueued the request.
The iocb->aio_sigevent structure can be used to request notification of
the operation's completion as described in aio(4).
RESTRICTIONS
The Asynchronous I/O Control Block structure pointed to by iocb must
remain valid until the operation has completed.
The asynchronous I/O control buffer iocb should be zeroed before the
aio_fsync() call to avoid passing bogus context information to the ker‐
nel.
Modification of the Asynchronous I/O Control Block structure is not
allowed while the request is queued.
RETURN VALUES
The 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.
ERRORS
The aio_fsync() system call will fail if:
[EAGAIN] The request was not queued because of system resource
limitations.
[EINVAL] The asynchronous notification method in
iocb->aio_sigevent.sigev_notify is invalid or not sup‐
ported.
[EOPNOTSUPP] Asynchronous file synchronization operations on the
file descriptor iocb->aio_fildes are unsafe and unsafe
asynchronous I/O operations are disabled.
[EINVAL] A value of the op argument is not set to O_SYNC.
The following conditions may be synchronously detected when the
aio_fsync() system call is made, or asynchronously, at any time there‐
after. 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.
[EBADF] The iocb->aio_fildes argument is not a valid descrip‐
tor.
[EINVAL] This implementation does not support synchronized I/O
for this file.
If the request is successfully enqueued, but subsequently cancelled or an
error occurs, the value returned by the aio_return() system call is per
the read(2) and write(2) system calls, and the value returned by the
aio_error() system call is one of the error returns from the read(2) or
write(2) system calls.
SEE ALSO
aio_cancel(2), aio_error(2), aio_read(2), aio_return(2), aio_suspend(2),
aio_waitcomplete(2), aio_write(2), fsync(2), sigevent(3), siginfo(3),
aio(4)
STANDARDS
The aio_fsync() system call is expected to conform to the IEEE Std 1003.1
(“POSIX.1”) standard.
HISTORY
The aio_fsync() system call first appeared in FreeBSD 7.0.
BSD August 19, 2016 BSD