usertools: fix handling EOF for telemetry input pipe

To allow the script to take queries from input pipes e.g. "echo
/ethdev/stats,0 | dpdk-telemetry.py", we need to handle the case of EOF
correctly without crashing with an exception. Do this by using a
try-except block around the input handling.

Fixes: 6a2967c112 ("usertools: add new telemetry script")
Cc: stable@dpdk.org

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Ciara Power <ciara.power@intel.com>

usertools/dpdk-telemetry.py

@@ -69,13 +69,17 @@ def handle_socket(path):
     CMDS = read_socket(sock, output_buf_len, False)["/"]
 
     # interactive prompt
-    text = input('--> ').strip()
-    while text != "quit":
-        if text.startswith('/'):
-            sock.send(text.encode())
-            read_socket(sock, output_buf_len)
+    try:
         text = input('--> ').strip()
-    sock.close()
+        while text != "quit":
+            if text.startswith('/'):
+                sock.send(text.encode())
+                read_socket(sock, output_buf_len)
+            text = input('--> ').strip()
+    except EOFError:
+        pass
+    finally:
+        sock.close()
 
 
 def readline_complete(text, state):