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