Fix: relayd: live: invalid return code on DETACH_SESSION
[lttng-tools.git] / src / common / align.h
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953192ba 1/*
ab5be9fa 2 * Copyright (C) 2010-2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
953192ba 3 *
ab5be9fa 4 * SPDX-License-Identifier: MIT
953192ba 5 *
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6 */
7
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8#ifndef _LTTNG_ALIGN_H
9#define _LTTNG_ALIGN_H
10
8564ccbd 11#include "bug.h"
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12#include <unistd.h>
13#include <limits.h>
14
d575a7f8 15#ifndef PAGE_SIZE /* Cygwin limits.h defines its own PAGE_SIZE. */
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16#define PAGE_SIZE sysconf(_SC_PAGE_SIZE)
17#endif
18
d575a7f8 19#ifndef PAGE_MASK /* macOS defines its own PAGE_MASK. */
953192ba 20#define PAGE_MASK (~(PAGE_SIZE - 1))
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21#endif
22
953192ba 23#define __ALIGN_MASK(v, mask) (((v) + (mask)) & ~(mask))
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24
25#ifndef ALIGN /* macOS defines its own ALIGN. */
953192ba 26#define ALIGN(v, align) __ALIGN_MASK(v, (__typeof__(v)) (align) - 1)
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27#endif
28
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29#define __ALIGN_FLOOR_MASK(v, mask) ((v) & ~(mask))
30
31#ifndef ALIGN_FLOOR
32#define ALIGN_FLOOR(v, align) __ALIGN_FLOOR_MASK(v, (__typeof__(v)) (align) - 1)
33#endif
34
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35#define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
36
37/**
38 * offset_align - Calculate the offset needed to align an object on its natural
39 * alignment towards higher addresses.
40 * @align_drift: object offset from an "alignment"-aligned address.
41 * @alignment: natural object alignment. Must be non-zero, power of 2.
42 *
43 * Returns the offset that must be added to align towards higher
44 * addresses.
45 */
46#define offset_align(align_drift, alignment) \
47 ({ \
48 LTTNG_BUILD_RUNTIME_BUG_ON((alignment) == 0 \
49 || ((alignment) & ((alignment) - 1))); \
50 (((alignment) - (align_drift)) & ((alignment) - 1)); \
51 })
52
53/**
54 * offset_align_floor - Calculate the offset needed to align an object
55 * on its natural alignment towards lower addresses.
56 * @align_drift: object offset from an "alignment"-aligned address.
57 * @alignment: natural object alignment. Must be non-zero, power of 2.
58 *
59 * Returns the offset that must be substracted to align towards lower addresses.
60 */
61#define offset_align_floor(align_drift, alignment) \
62 ({ \
63 LTTNG_BUILD_RUNTIME_BUG_ON((alignment) == 0 \
64 || ((alignment) & ((alignment) - 1))); \
d07ceecd 65 (((align_drift) - (alignment)) & ((alignment) - 1)); \
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66 })
67
68#endif /* _LTTNG_ALIGN_H */
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