fflush

#include <stdio.h>

int fflush (
  FILE *stream);        /* stream to flush */

The fflush function flushes the specified file stream. If the file associated with stream is open for output, the contents of the buffer associated with the stream are written to the file.

The fflush function is in the RL-FlashFS library. The prototype is defined in stdio.h.

Note

• This function writes the File Allocation Record to the file system along with the file data. Unlike the fclose function, the fflush function leaves the file open for continued writes.

#include <rtl.h>
#include <stdio.h>

void main (void) {
   FILE *fout;
   int i;

   fout = fopen ("Flush.test","r");
   if (fout == NULL) {
      printf ("File open error!\n");
   }
   else {
      for (i = 'A'; i < 'Z'; i++) {
         fputc (i, fout);
      }
      // Now flush the file buffers
      fflush (fout);
      fputs ("Write to an empty file buffer.", fout);
      fclose (fout);
   }
}