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+'\" et
+.TH FDATASYNC "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+fdatasync
+\(em synchronize the data of a file
+(\fBREALTIME\fP)
+.SH SYNOPSIS
+.LP
+.nf
+#include <unistd.h>
+.P
+int fdatasync(int \fIfildes\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIfdatasync\fR()
+function shall force all currently queued I/O operations associated
+with the file indicated by file descriptor
+.IR fildes
+to the synchronized I/O completion state.
+.P
+The functionality shall be equivalent to
+\fIfsync\fR()
+with the symbol _POSIX_SYNCHRONIZED_IO defined,
+with the exception that all I/O operations shall be completed as
+defined for synchronized I/O data integrity completion.
+.SH "RETURN VALUE"
+If successful, the
+\fIfdatasync\fR()
+function shall return the value 0; otherwise, the function shall return
+the value \-1 and set
+.IR errno
+to indicate the error. If the
+\fIfdatasync\fR()
+function fails, outstanding I/O operations are not guaranteed to have
+been completed.
+.SH ERRORS
+The
+\fIfdatasync\fR()
+function shall fail if:
+.TP
+.BR EBADF
+The
+.IR fildes
+argument is not a valid file descriptor.
+.TP
+.BR EINVAL
+This implementation does not support synchronized I/O for this file.
+.P
+In the event that any of the queued I/O operations fail,
+\fIfdatasync\fR()
+shall return the error conditions defined for
+\fIread\fR()
+and
+\fIwrite\fR().
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+Note that even if the file descriptor is not open for writing,
+if there are any pending write requests on the underlying file,
+then that I/O will be completed prior to the return of
+\fIfdatasync\fR().
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIaio_fsync\fR\^(\|)",
+.IR "\fIfcntl\fR\^(\|)",
+.IR "\fIfsync\fR\^(\|)",
+.IR "\fIopen\fR\^(\|)",
+.IR "\fIread\fR\^(\|)",
+.IR "\fIwrite\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<unistd.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+In the event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .