tests/posix: add testcase for if_nameindex

Author: no92

tests/meson.build

@@ -159,6 +159,7 @@ all_test_cases = [
 	'posix/wcscoll_l',
 	'posix/wcsxfrm_l',
 	'posix/aio',
+	'posix/if_nameindex',
 	'glibc/getopt',
 	'glibc/ffsl-ffsll',
 	'glibc/error_message_count',

tests/posix/if_nameindex.c

@@ -0,0 +1,22 @@
+#include <assert.h>
+#include <net/if.h>
+#include <stdio.h>
+#include <string.h>
+
+int main(void) {
+	struct if_nameindex *ni;
+
+	ni = if_nameindex();
+	assert(ni != NULL);
+
+	for (struct if_nameindex *i = ni; !(i->if_index == 0 && i->if_name == NULL); i++) {
+		fprintf(stderr, "[%d] '%s'\n", i->if_index, i->if_name);
+		assert(i->if_index > 0);
+		assert(i->if_name != NULL);
+		assert(strlen(i->if_name) > 0);
+	}
+
+	if_freenameindex(ni);
+
+	return 0;
+}