Index: src/mt.c
===================================================================
--- src/mt.c.orig
+++ src/mt.c
@@ -723,11 +723,11 @@ main (int argc, char **argv)
 #ifdef MTDATCOMP
 	case MTDATCOMP:
 #endif
-       tapedesc = rmtopen (tapedev, O_WRONLY, 0, rsh_command_option);
+       tapedesc = rmtopen (tapedev, O_WRONLY | O_NONBLOCK, 0, rsh_command_option);
       break;
 
     default:
-      tapedesc = rmtopen (tapedev, O_RDONLY, 0, rsh_command_option);
+      tapedesc = rmtopen (tapedev, O_RDONLY | O_NONBLOCK, 0, rsh_command_option);
     }
   
   if (tapedesc == -1)
Index: src/util.c
===================================================================
--- src/util.c.orig
+++ src/util.c
@@ -767,14 +767,14 @@ open_archive (char *file)
   copy_in = process_copy_in;
 
   if (copy_function == copy_in)
-    fd = rmtopen (file, O_RDONLY | O_BINARY, MODE_RW, rsh_command_option);
+    fd = rmtopen (file, O_RDONLY | O_BINARY | O_NONBLOCK, MODE_RW, rsh_command_option);
   else
     {
       if (!append_flag)
-	fd = rmtopen (file, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, MODE_RW,
+	fd = rmtopen (file, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_NONBLOCK, MODE_RW,
 			rsh_command_option);
       else
-	fd = rmtopen (file, O_RDWR | O_BINARY, MODE_RW, rsh_command_option);
+	fd = rmtopen (file, O_RDWR | O_BINARY | O_NONBLOCK, MODE_RW, rsh_command_option);
     }
 
   return fd;