SYNOPSIS
       #include <unistd.h>

       void sync(void);


DESCRIPTION
       The  sync() function shall cause all information in memory that updates
       file systems to be scheduled for writing out to all file systems.

       The writing, although  scheduled,  is  not  necessarily  complete  upon
       return from sync().

RETURN VALUE
       The sync() function shall not return a value.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       fsync()   ,   the  Base  Definitions  volume  of  IEEE Std 1003.1-2001,
       <unistd.h>

COPYRIGHT
       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 .