[NaCl SDK] nacl_io: implement getaddrinfo()

native_client_sdk/src/libraries/nacl_io/syscalls/gai_strerror.c

+/* Copyright 2014 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+#include "nacl_io/ossocket.h"
+
+#ifdef PROVIDES_SOCKET_API
+
+#include <stdio.h>
+
+#ifndef __GLIBC__
+char* gai_strerror(int errcode) {
+  switch (errcode) {
+    case EAI_BADFLAGS: return "Invalid value for `ai_flags' field.";
+    case EAI_NONAME: return "NAME or SERVICE is unknown.";
+    case EAI_AGAIN: return "Temporary failure in name resolution.";
+    case EAI_FAIL: return "Non-recoverable failure in name res.";
+    case EAI_FAMILY: return "`ai_family' not supported.";
+    case EAI_SOCKTYPE: return "`ai_socktype' not supported.";
+    case EAI_SERVICE: return "SERVICE not supported for `ai_socktype'.";
+    case EAI_MEMORY: return "Memory allocation failure.";
+    case EAI_SYSTEM: return "System error returned in `errno'.";
+    case EAI_OVERFLOW: return "Argument buffer overflow.";
+  }
+
+  static char unknown_msg[128];
+  sprintf(unknown_msg, "Unknown error in getaddrinfo: %d.", errcode);
+  return unknown_msg;
+}
+#endif
+
+#endif // PROVIDES_SOCKET_API