1 files changed, 4 insertions, 2 deletions
diff --git a/unixio.c b/unixio.c
index 6a7e0f0..5dd7843 100644
--- a/unixio.c
+++ b/unixio.c
@@ -39,6 +39,8 @@
   and strip it from inbound characters.
 */
 #include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
 #include <sys/stat.h>
 #include <time.h>
 #include <errno.h>
@@ -143,8 +145,8 @@ int
 pktmode(short on) {
     if (ttyfd < 0)                      /* Device must be open */
       return(0);
-    system(on ? "stty raw -echo" : "stty sane"); /* Crude but effective */
-    return(1);
+    return (system(on ? "stty raw -echo" : "stty sane") /* Crude but effective */
+            ? 0 : 1);
 }