PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

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

PROLOG         top

       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         top

       fdatasync — synchronize the data of a file (REALTIME)

SYNOPSIS         top

       #include <unistd.h>

       int fdatasync(int fildes);

DESCRIPTION         top

       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         top

       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         top

       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         top

       None.

APPLICATION USAGE         top

       None.

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       aio_fsync(3p), fcntl(3p), fsync(3p), open(3p), read(3p), write(3p)

       The Base Definitions volume of POSIX.1‐2008, unistd.h(0p)

COPYRIGHT         top

       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(3P)