1 #include <fcntl.h>

     2 #include "fd.h"

     3 

     4 int fd_copy(to,from)

     5 int to;

     6 int from;

     7 {

     8   if (to == from) return 0;

     9   if (fcntl(from,F_GETFL,0) == -1) return -1;

    10   close(to);

    11   if (fcntl(from,F_DUPFD,to) == -1) return -1;

    12   return 0;

    13 }