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+'\" t
+.\" Copyright (c) 2003 Andries Brouwer (aeb@cwi.nl)
+.\"
+.\" SPDX-License-Identifier: GPL-2.0-or-later
+.\"
+.TH aio_fsync 3 (date) "Linux man-pages (unreleased)"
+.SH NAME
+aio_fsync \- asynchronous file synchronization
+.SH LIBRARY
+Real-time library
+.RI ( librt ", " \-lrt )
+.SH SYNOPSIS
+.nf
+.B "#include <aio.h>"
+.P
+.BI "int aio_fsync(int " op ", struct aiocb *" aiocbp );
+.fi
+.SH DESCRIPTION
+The
+.BR aio_fsync ()
+function does a sync on all outstanding asynchronous I/O operations
+associated with
+.IR aiocbp\->aio_fildes .
+(See
+.BR aio (7)
+for a description of the
+.I aiocb
+structure.)
+.P
+More precisely, if
+.I op
+is
+.BR O_SYNC ,
+then all currently queued I/O operations shall be
+completed as if by a call of
+.BR fsync (2),
+and if
+.I op
+is
+.BR O_DSYNC ,
+this call is the asynchronous analog of
+.BR fdatasync (2).
+.P
+Note that this is a request only; it does not wait for I/O completion.
+.P
+Apart from
+.IR aio_fildes ,
+the only field in the structure pointed to by
+.I aiocbp
+that is used by this call is the
+.I aio_sigevent
+field (a
+.I sigevent
+structure, described in
+.BR sigevent (3type)),
+which indicates the desired type of asynchronous notification at completion.
+All other fields are ignored.
+.SH RETURN VALUE
+On success (the sync request was successfully queued)
+this function returns 0.
+On error, \-1 is returned, and
+.I errno
+is set to indicate the error.
+.SH ERRORS
+.TP
+.B EAGAIN
+Out of resources.
+.TP
+.B EBADF
+.I aio_fildes
+is not a valid file descriptor open for writing.
+.TP
+.B EINVAL
+Synchronized I/O is not supported for this file, or
+.I op
+is not
+.B O_SYNC
+or
+.BR O_DSYNC .
+.TP
+.B ENOSYS
+.BR aio_fsync ()
+is not implemented.
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR aio_fsync ()
+T}	Thread safety	MT-Safe
+.TE
+.SH STANDARDS
+POSIX.1-2008.
+.SH HISTORY
+glibc 2.1.
+POSIX.1-2001.
+.SH SEE ALSO
+.BR aio_cancel (3),
+.BR aio_error (3),
+.BR aio_read (3),
+.BR aio_return (3),
+.BR aio_suspend (3),
+.BR aio_write (3),
+.BR lio_listio (3),
+.BR aio (7),
+.BR sigevent (3type)