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FDATASYNC(3P)              POSIX Programmer's Manual             FDATASYNC(3P)
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.
NAME
       fdatasync -- synchronize the data of a file (REALTIME)
SYNOPSIS
       #include <unistd.h>
       int fdatasync(int fildes);
DESCRIPTION
       The fdatasync() function shall force all currently  queued  I/O  opera-
       tions  associated  with the file indicated by file descriptor fildes to
       the synchronized I/O completion state.
       The functionality shall  be  equivalent  to  fsync()  with  the  symbol
       _POSIX_SYNCHRONIZED_IO  defined, with the exception that all I/O opera-
       tions shall be completed as defined for synchronized I/O data integrity
       completion.
RETURN VALUE
       If  successful, the fdatasync() function shall return the value 0; oth-
       erwise, the function shall return the value -1 and set errno  to  indi-
       cate  the  error.  If  the  fdatasync() function fails, outstanding I/O
       operations are not guaranteed to have been completed.
ERRORS
       The fdatasync() function shall fail if:
       EBADF  The fildes argument is not a  valid  file  descriptor  open  for
              writing.
       EINVAL This  implementation  does not support synchronized I/O for this
              file.
       In the event that any of the queued I/O  operations  fail,  fdatasync()
       shall return the error conditions defined for read() and write().
       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       None.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       aio_fsync(), fcntl(), fsync(), open(), read(), write()
       The Base Definitions volume of POSIX.1-2008, <unistd.h>
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  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.unix.org/online.html .
       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.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                        FDATASYNC(3P)