text: #include <stdio.h> size_t fwrite(const void *restrict ptr, size_t size, size_t nitems, FILE *restrict stream); last data modification and last file status change timestamps of the file shall be marked for update between the successful execution of fwrite() and the next successful completion of a call to fflush() or fclose() on the same stream, or a call to exit() or abort().
  The following sections are informative.
  The Base Definitions volume of POSIX.1-2008, <stdio.h>
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