fflush

#include <stdio.h>

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

The function fflush enforces a write operation to a data stream. Associated buffers are emptied and the content is written to the file. The function writes the File Allocation Record to the file system along with the file data. fflush leaves the file open. The parameter stream is a pointer defining the data stream.

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

Note

• On FAT drives, fflush will only flush buffer in the ARM Run-Time Library and flushed content will remain in the FlashFS cache buffers. To write entire file content on FAT drive and create a consistent file with proper size, you must close the file using the fclose library function.

• 0 - on success.
• EOF - on error.

fclose, fopen

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

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

  fout = fopen ("Flush.test", "w");
  if (fout != NULL)  {
    for (i = 'A'; i < 'Z'; i++)  {
      fputc (i, fout);
    }
    // Now flush the file buffers
    if (fflush (fout))  {
      printf ("An error occurred while flushing the buffer.\n");
    }
    else  {
      printf ("Writing to the file went OK.\n");
    }
    fclose (fout);
  }
}