isc/win32/resource.c

/*
 * Copyright (C) 2000, 2001, 2004, 2007, 2008, 2016  Internet Systems Consortium, Inc. ("ISC")
 *
 * 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 http://mozilla.org/MPL/2.0/.
 */

/* $Id: resource.c,v 1.10 2008/07/11 23:47:09 tbox Exp $ */

#include <config.h>

#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));
}