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#include <mach/port.h> 26 27extern int __iopolicysys(int, struct _iopol_param_t *); 28extern void _pthread_clear_qos_tsd(mach_port_t); 29 30int 31getiopolicy_np(int iotype, int scope) 32{ 33 int policy, error; 34 struct _iopol_param_t iop_param; 35 36 if (iotype != IOPOL_TYPE_DISK || 37 (scope != IOPOL_SCOPE_PROCESS && scope != IOPOL_SCOPE_THREAD)) { 38 errno = EINVAL; 39 policy = -1; 40 goto exit; 41 } 42 43 iop_param.iop_scope = scope; 44 iop_param.iop_iotype = iotype; 45 error = __iopolicysys(IOPOL_CMD_GET, &iop_param); 46 if (error != 0) { 47 errno = error; 48 policy = -1; 49 goto exit; 50 } 51 52 policy = iop_param.iop_policy; 53 54 exit: 55 return policy; 56} 57 58int 59setiopolicy_np(int iotype, int scope, int policy) 60{ 61 /* kernel validates the indiv values, no need to repeat it */ 62 struct _iopol_param_t iop_param; 63 64 iop_param.iop_scope = scope; 65 iop_param.iop_iotype = iotype; 66 iop_param.iop_policy = policy; 67 68 int rv = __iopolicysys(IOPOL_CMD_SET, &iop_param); 69 if (rv == -2) { 70 /* not an actual error but indication that __iopolicysys removed the thread QoS */ 71 _pthread_clear_qos_tsd(MACH_PORT_NULL); 72 rv = 0; 73 } 74 75 return rv; 76} 77