#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>

int main()
{
 int FH1, FH2;

 FH1 = open("./auf2.c",O_RDONLY);
 if(FH1 == -1) { /*Fehler*/ exit(0); }
 FH2 = fcntl(FH1, F_DUPFD, 0);
 if(FH2 == -1) { /*Fehler*/ exit(0); }

 system("./xt");

 return 0;
}