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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 dif-
       fer (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 operations 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 operations shall be completed as defined for synchronized I/O data integrity completion.

RETURN VALUE
       If successful, the fdatasync() function shall return the value 0; otherwise,  the  function  shall  return  the
       value -1 and set errno to indicate 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 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, Stan-
       dard  for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
       tions 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 Stan-
       dard, 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)