fdatasync

FDATASYNC(3POSIX)          POSIX Programmer's Manual         FDATASYNC(3POSIX)



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
       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 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
       Electrical 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.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2013                    FDATASYNC(3POSIX)