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typedef struct {
  unsigned int isreadonly:1;   /* read only - or - read/write (default) */
  unsigned int isshareable:1;  /* shared - or - single (default) */
  unsigned int isunbuffered:1; /* no buffering - or - buffer (default) */
} SC_FLAGS;

SC_FLAGS contains bit fields indicating how a file was opened.
isreadonly is set if was opened using SC_RDONLY, isshareable
indicates that the file was opened with SC_SHARED, and buffering was
disabled if isunbuffered is set (SC_FLUSH).