(isc_relocate_fd): Implemented for real.

src/libraries/libisc-new/src/isc_relocate.c

@@ -10,6 +10,8 @@
 #endif
 #include <sys/types.h>
 #include <sys/socket.h>
+#include <fcntl.h>
+#include <unistd.h>
 
 
 #include "isc.h"
@@ -19,9 +21,15 @@ int
 isc_relocate_fd(int fd,
 		int limit)
 {
-    if (limit == 0)
+    int high_fd;
+
+    if (limit <= 0)
+	return fd;
+
+    high_fd = fcntl(fd, F_DUPFD, limit);
+    if (high_fd < 0)
 	return fd;
 
-    /* FIXME: magic ioctl here */
-    return fd;
+    close(fd);
+    return high_fd;
 }