fdatasync(3p) — Linux manual page

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.

       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

       Note that even if the file descriptor is not open for writing, if
       there are any pending write requests on the underlying file, then
       that I/O will be completed prior to the return of fdatasync().

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.1‐2017, unistd.h(0p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic
       form from IEEE Std 1003.1-2017, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The
       Open Group Base Specifications Issue 7, 2018 Edition, Copyright
       (C) 2018 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 .

       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               2017                     FDATASYNC(3P)

Pages that refer to this page: unistd.h(0p)aio_fsync(3p)