/*	$NetBSD: resource.c,v 1.5 2022/09/23 12:15:35 christos Exp $	*/

/*
 * 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));
}