🚀 go-pugleaf

I'm receiving a warning message when I compile the following bit
of code. The message is that the second parameter to signal()
("handler") is of an incompatible type.  I'm using the command
line "gcc -O -ansi filename.c" to compile this. I've tried
making the interrupt handler return void rather than int, 
but the warning message persists.  The program seems to work
ok (this is of course extracted from a larger program), but
I'd like to know how I can avoid this error message.

Ted Campbell
Duke University
tcamp@acpub.duke.edu

code follows:

#include "stdio.h"
#include "stdlib.h"
#include "signal.h"

extern int handler( void );

void
main( argc, argv )
   int argc;
   char **argv;
   {
   signal( SIGINT, handler );
   }


int
handler( void )
   {
   }