1 files changed, 66 insertions, 0 deletions
diff --git a/lib/isc/win32/resource.c b/lib/isc/win32/resource.c
new file mode 100644
index 0000000..b44b322
--- /dev/null
+++ b/lib/isc/win32/resource.c
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0.  If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <stdio.h>
+
+#include <isc/platform.h>
+#include <isc/resource.h>
+#include <isc/result.h>
+#include <isc/util.h>
+
+#include "errno2result.h"
+
+/*
+ * Windows limits the maximum number of open files to 2048
+ */
+
+#define WIN32_MAX_OPEN_FILES 2048
+
+isc_result_t
+isc_resource_setlimit(isc_resource_t resource, isc_resourcevalue_t value) {
+	isc_resourcevalue_t rlim_value;
+	int wresult;
+
+	if (resource != isc_resource_openfiles) {
+		return (ISC_R_NOTIMPLEMENTED);
+	}
+
+	if (value == ISC_RESOURCE_UNLIMITED) {
+		rlim_value = WIN32_MAX_OPEN_FILES;
+	} else {
+		rlim_value = min(value, WIN32_MAX_OPEN_FILES);
+	}
+
+	wresult = _setmaxstdio((int)rlim_value);
+
+	if (wresult > 0) {
+		return (ISC_R_SUCCESS);
+	} else {
+		return (isc__errno2result(errno));
+	}
+}
+
+isc_result_t
+isc_resource_getlimit(isc_resource_t resource, isc_resourcevalue_t *value) {
+	if (resource != isc_resource_openfiles) {
+		return (ISC_R_NOTIMPLEMENTED);
+	}
+
+	*value = WIN32_MAX_OPEN_FILES;
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_resource_getcurlimit(isc_resource_t resource, isc_resourcevalue_t *value) {
+	return (isc_resource_getlimit(resource, value));
+}