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The following header files are present in the  sys subdirectory.  Their
presence in this directory indicates that they are system-dependent header
files.

sys\locking.h
    This header file contains the manifest constants used by the  locking
    function.

sys\stat.h
    This POSIX header file contains the declarations pertaining to file
    status, including definitions for the  fstat and  stat functions and for
    the structure:

    stat
        describes the information obtained for a directory, file or device


sys\timeb.h
    This header file describes the  timeb structure used in conjunction with
    the  ftime function.

sys\types.h
    This POSIX header file contains declarations for the types used by
    system-level calls to obtain file status or time information.

sys\utime.h
    This POSIX header file contains a declaration for the  utime function
    and for the structured type  utimbuf used by it.