sys/getiopolicy_np.c

   1 /*
   2  * Copyright (c) 2006 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 #include <errno.h>
  24 #include <sys/resource.h>
  25
  26 extern int __iopolicysys(int, struct _iopol_param_t *);
  27
  28 int
  29 getiopolicy_np(int iotype, int scope)
  30 {
  31         int policy, error;
  32         struct _iopol_param_t iop_param;
  33
  34         if (iotype != IOPOL_TYPE_DISK ||
  35                 (scope != IOPOL_SCOPE_PROCESS && scope != IOPOL_SCOPE_THREAD)) {
  36                 errno = EINVAL;
  37                 policy = -1;
  38                 goto exit;
  39         }
  40
  41         iop_param.iop_scope = scope;
  42         iop_param.iop_iotype = iotype;
  43         error = __iopolicysys(IOPOL_CMD_GET, &iop_param);
  44         if (error != 0) {
  45                 errno = error;
  46                 policy = -1;
  47                 goto exit;
  48         }
  49
  50         policy = iop_param.iop_policy;
  51
  52   exit:
  53         return policy;
  54 }
  55
  56 int
  57 setiopolicy_np(int iotype, int scope, int policy)
  58 {
  59         int error;
  60         struct _iopol_param_t iop_param;
  61
  62         if (iotype != IOPOL_TYPE_DISK ||
  63                 (scope != IOPOL_SCOPE_PROCESS && scope != IOPOL_SCOPE_THREAD)) {
  64                 errno = EINVAL;
  65                 error = -1;
  66                 goto exit;
  67         }
  68
  69         switch (policy) {
  70         case IOPOL_DEFAULT:
  71         case IOPOL_NORMAL:
  72         case IOPOL_THROTTLE:
  73         case IOPOL_PASSIVE:
  74                 break;
  75         default:
  76                 errno = EINVAL;
  77                 error = -1;
  78                 goto exit;
  79         }
  80
  81         iop_param.iop_scope = scope;
  82         iop_param.iop_iotype = iotype;
  83         iop_param.iop_policy = policy;
  84         error = __iopolicysys(IOPOL_CMD_SET, &iop_param);
  85         if (error != 0) {
  86                 errno = error;
  87                 error = -1;
  88                 goto exit;
  89         }
  90
  91   exit:
  92         return error;
  93 }