trusty (3) fdatasync.3posix.gz

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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>


       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications 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 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 .