gh-95174: WASI: skip missing sockets functions (GH-95179)

Author: tiran

Lib/test/test_socket.py

@@ -965,6 +965,19 @@ def testWindowsSpecificConstants(self):
         socket.IPPROTO_L2TP
         socket.IPPROTO_SCTP
 
+    @unittest.skipIf(support.is_wasi, "WASI is missing these methods")
+    def test_socket_methods(self):
+        # socket methods that depend on a configure HAVE_ check. They should
+        # be present on all platforms except WASI.
+        names = [
+            "_accept", "bind", "connect", "connect_ex", "getpeername",
+            "getsockname", "listen", "recvfrom", "recvfrom_into", "sendto",
+            "setsockopt", "shutdown"
+        ]
+        for name in names:
+            if not hasattr(socket.socket, name):
+                self.fail(f"socket method {name} is missing")
+
     @unittest.skipUnless(sys.platform == 'darwin', 'macOS specific test')
     @unittest.skipUnless(socket_helper.IPV6_ENABLED, 'IPv6 required for this test')
     def test3542SocketOptions(self):

Misc/NEWS.d/next/Build/2022-07-23-21-39-09.gh-issue-95174.7cYMZR.rst

@@ -0,0 +1 @@
+Python now skips missing :mod:`socket` functions and methods on WASI. WASI can only create sockets from existing fd / accept and has no netdb.

Modules/addrinfo.h

@@ -162,7 +162,9 @@ struct sockaddr_storage {
 #ifdef __cplusplus
 extern "C" {
 #endif
+#ifdef ENABLE_IPV6
 extern void freehostent(struct hostent *);
+#endif
 #ifdef __cplusplus
 }
 #endif

Modules/getaddrinfo.c

@@ -61,6 +61,9 @@
 # define FAITH
 #endif
 
+#ifdef HAVE_NETDB_H
+#define HAVE_GETADDRINFO 1
+
 #define SUCCESS 0
 #define GAI_ANY 0
 #define YES 1
@@ -636,3 +639,5 @@ get_addr(hostname, af, res, pai, port0)
     *res = NULL;
     return error;
 }
+
+#endif // HAVE_NETDB_H

Modules/getnameinfo.c

@@ -48,6 +48,9 @@
 #include "addrinfo.h"
 #endif
 
+#ifdef HAVE_NETDB_H
+#define HAVE_GETNAMEINFO 1
+
 #define SUCCESS 0
 #define YES 1
 #define NO  0
@@ -211,3 +214,4 @@ getnameinfo(sa, salen, host, hostlen, serv, servlen, flags)
     }
     return SUCCESS;
 }
+#endif // HAVE_NETDB_H