Header File 

stdio.h  

Category 

Input/output Routines 

Prototype 

int _fileno(FILE *stream); 

Description 

Gets the file handle. 

_fileno is a macro that returns the file handle for the given stream. If stream has more than one handle _fileno returns the handle assigned to the stream when it was first opened. 

Return Value 

_fileno returns the integer file handle associated with stream. 

Example  

#include <stdio.h>
int main(void)
{
   FILE *stream;
   int handle;
   /* create a file */
   stream = fopen("DUMMY.FIL", "w");
   /* obtain the file handle associated with the stream */
   handle = fileno(stream);
   /* display the handle number */
   printf("handle number: %d\n", handle);
   /* close the file */
   fclose(stream);
   return 0;
}

Portability