do not busy loop while sending

ws/test_ws.sh

@@ -0,0 +1,52 @@
+#!/bin/sh
+
+rm -rf /tmp/ws_test
+mkdir -p /tmp/ws_test
+
+# Start a transport server
+cd /tmp/ws_test
+ws transfer --port 8090 --pidfile /tmp/ws_test/pidfile &
+
+# Wait until the transfer server is up 
+while true
+do
+    nc -zv 127.0.0.1 8090 && {
+        echo "Transfer server up and running"
+        break
+    }
+    echo "sleep ..."
+    sleep 0.1
+done
+
+# Start a receiver
+mkdir -p /tmp/ws_test/receive
+cd /tmp/ws_test/receive
+ws receive ws://127.0.0.1:8090 &
+
+mkdir /tmp/ws_test/send
+cd /tmp/ws_test/send
+# mkfile 10m 10M_file
+dd if=/dev/urandom of=10M_file count=10000 bs=1024
+
+# Start the sender job
+ws send ws://127.0.0.1:8090 10M_file
+
+# Wait until the file has been written to disk
+while true
+do
+    if test -f /tmp/ws_test/receive/10M_file ; then
+        echo "Received file does exists, exiting loop"
+        break
+    fi
+    echo "sleep ..."
+    sleep 0.1
+done
+
+cksum /tmp/ws_test/send/10M_file
+cksum /tmp/ws_test/receive/10M_file
+
+# Give some time to ws receive to terminate
+sleep 2
+
+# Cleanup
+kill `cat /tmp/ws_test/pidfile`