From d1995e50ebda074f8151609bb4c95d4c31072513 Mon Sep 17 00:00:00 2001
From: Damien George
Date: Sun, 30 Aug 2020 13:20:51 +1000
Subject: extmod/modlwip: Fix error return for TCP recv when not connected.

This commit fixes the cases when a TCP socket is in STATE_NEW,
STATE_LISTENING or STATE_CONNECTING and recv() is called on it.  It now
raises ENOTCONN instead of a random error code due to it previously
indexing beyond the start of error_lookup_table[].

Signed-off-by: Damien George <damien@micropython.org>
---
 tests/extmod/usocket_tcp_basic.py | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 tests/extmod/usocket_tcp_basic.py

(limited to 'tests')

diff --git a/tests/extmod/usocket_tcp_basic.py b/tests/extmod/usocket_tcp_basic.py
new file mode 100644
index 000000000..368dfe3c9
--- /dev/null
+++ b/tests/extmod/usocket_tcp_basic.py
@@ -0,0 +1,17 @@
+# Test basic, stand-alone TCP socket functionality
+
+try:
+    import usocket as socket, uerrno as errno
+except ImportError:
+    try:
+        import socket, errno
+    except ImportError:
+        print("SKIP")
+        raise SystemExit
+
+# recv() on a fresh socket should raise ENOTCONN
+s = socket.socket()
+try:
+    s.recv(1)
+except OSError as er:
+    print("ENOTCONN:", er.args[0] == errno.ENOTCONN)
-- 
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