Header File 

stdio.h  

Category 

Input/output Routines 

Prototype 

int _flushall(void); 

Description 

Flushes all streams. 

_flushall clears all buffers associated with open input streams and writes all buffers associated with open output streams to their respective files. Any read operation following _flushall reads new data into the buffers from the input files. Streams stay open after _flushall executes. 

Return Value 

_flushall returns an integer the number of open input and output streams. 

Example  

#include <stdio.h>
int main(void)
{
   FILE *stream;
   /* create a file */
   stream = fopen("DUMMY.FIL", "w");
   /* flush all open streams */
   printf("%d streams were flushed.\n", flushall());
   /* close the file */
   fclose(stream);
   return 0;
}

Portability