oracular (3) fdatasync.3posix.gz

Provided by: manpages-posix-dev_2017a-2_all bug

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.

       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
       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
       None.


FUTURE DIRECTIONS
       None.


SEE ALSO
       aio_fsync(), fcntl(), fsync(), open(), read(), write()

       The Base Definitions volume of POSIX.1‐2017, <unistd.h>


       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 .