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