getaddrinfo tests: Skip when DNS resolution is unavailable

* tests/test-getaddrinfo.c (simple): Skip tests for unavailable DNS.

Signed-off-by: Simon Josefsson <simon@josefsson.org>

ChangeLog

@@ -1,3 +1,8 @@
+2026-06-30  Zineb Zaadoud <zineb.zaadoud@canonical.com>  (tiny change)
+
+	getaddrinfo: Skip when DNS resolution is unavailable
+	* tests/test-getaddrinfo.c (simple): Skip tests for unavailable DNS.
+
 2026-06-26  Paul Eggert  <eggert@cs.ucla.edu>
 
 	strfmon_l: be consistent about unsigned vs size_t

tests/test-getaddrinfo.c

@@ -120,6 +120,16 @@ simple (int pass, char const *host, char const *service)
           fprintf (stderr, "skipping getaddrinfo test: no network?\n");
           return 77;
         }
+
+      /* EAI_NONAME can be returned in sandboxed build environments where
+         DNS resolution is unavailable. Treat it like EAI_AGAIN and skip.  */
+      if (res == EAI_NONAME)
+        {
+          skip++;
+          fprintf (stderr, "skipping getaddrinfo test: no DNS resolver?\n");
+          return 77;
+        }
+
       /* Solaris reports EAI_SERVICE for "http" and "https".  Don't
          fail the test merely because of this.  */
       if (res == EAI_SERVICE)