root / trunk / data / kext-tools / getiopolicy_np.c

/*
 * Copyright (c) 2006 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
#include <errno.h>
#include <sys/resource.h>

extern int __iopolicysys(int, struct _iopol_param_t *);

int
getiopolicy_np(int iotype, int scope)
{
        int policy, error;
        struct _iopol_param_t iop_param;

        if (iotype != IOPOL_TYPE_DISK ||
                (scope != IOPOL_SCOPE_PROCESS && scope != IOPOL_SCOPE_THREAD)) {
                errno = EINVAL;
                policy = -1;
                goto exit;
        }

        iop_param.iop_scope = scope;
        iop_param.iop_iotype = iotype;
        error = syscall(322, IOPOL_CMD_GET, &iop_param);
        if (error != 0) {
                errno = error;
                policy = -1;
                goto exit;
        }

        policy = iop_param.iop_policy;

  exit:
        return policy;
}

int
setiopolicy_np(int iotype, int scope, int policy)
{
        int error;
        struct _iopol_param_t iop_param;
        
        if (iotype != IOPOL_TYPE_DISK ||
                (scope != IOPOL_SCOPE_PROCESS && scope != IOPOL_SCOPE_THREAD)) {
                errno = EINVAL;
                error = -1;
                goto exit;
        }

        switch (policy) {
        case IOPOL_DEFAULT:
        case IOPOL_NORMAL:
        case IOPOL_THROTTLE:
        case IOPOL_PASSIVE:
                break;
        default:
                errno = EINVAL;
                error = -1;
                goto exit;
        }

        iop_param.iop_scope = scope;
        iop_param.iop_iotype = iotype;
        iop_param.iop_policy = policy;
        error = syscall(322, IOPOL_CMD_SET, &iop_param);
        if (error != 0) {
                errno = error;
                error = -1;
                goto exit;
        }

  exit:
        return error;
}