diff -dur httptunnel-3.3/common.c httptunnel-3.3-fix_write_stdin/common.c
--- httptunnel-3.3/common.c	2001-02-25 12:45:41.000000000 +0100
+++ httptunnel-3.3-fix_write_stdin/common.c	2007-06-20 21:38:54.000000000 +0200
@@ -314,7 +314,7 @@
 
       /* If fd == 0, then we are using --stdin-stdout so write to stdout,
        * not fd. */
-      m = write_all (fd ? fd : 0, buf, (size_t)n);
+      m = write_all (fd ? fd : 1, buf, (size_t)n);
       log_annoying ("write_all (%d, %p, %d) = %d", fd ? fd : 1, buf, n, m);
       return m;
     }