servent: Add tests.

* tests/test-servent.c: New file.
* modules/servent-tests: New file.

ChangeLog

@@ -1,3 +1,9 @@
+2024-12-30  Collin Funk  <collin.funk1@gmail.com>
+
+	servent: Add tests.
+	* tests/test-servent.c: New file.
+	* modules/servent-tests: New file.
+
 2024-12-30  Bruno Haible  <bruno@clisp.org>
 
 	mbfile: Support pushback characters also right before EOF.

modules/servent-tests

@@ -0,0 +1,12 @@
+Files:
+tests/test-servent.c
+tests/signature.h
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-servent
+check_PROGRAMS += test-servent
+test_servent_LDADD = $(LDADD) $(SERVENT_LIB)

tests/test-servent.c

@@ -0,0 +1,46 @@
+/* Test the servent module.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published
+   by the Free Software Foundation, either version 3 of the License,
+   or (at your option) any later version.
+
+   This file is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Collin Funk <collin.funk1@gmail.com>, 2024.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <netdb.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (getservbyname, struct servent *,
+                 (char const *, char const *));
+SIGNATURE_CHECK (getservbyport, struct servent *, (int, char const *));
+
+#include <stdio.h>
+#include <arpa/inet.h>
+
+int
+main (void)
+{
+  struct servent *result;
+
+  result = getservbyname ("domain", "tcp");
+  if (result == NULL)
+    fputs ("getservbyname failed\n", stderr);
+
+  result = getservbyport (htons(53), "tcp");
+  if (result == NULL)
+    fputs ("getportbyname failed\n", stderr);
+
+  return 0;
+}