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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 Defi-
       nitions volume of IEEE Std 1003.1-2001, <unistd.h>
COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 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 .

IEEE/The Open Group                  2003                        FDATASYNC(3P)