Fix: flt.lttng-utils.debug-info: memory leak bt_dwarf_die struct
[babeltrace.git] / include / babeltrace / mmap-align-internal.h
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1#ifndef _BABELTRACE_MMAP_ALIGN_H
2#define _BABELTRACE_MMAP_ALIGN_H
3
4/*
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5 * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
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16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
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24 */
25
3d9990ac 26#include <babeltrace/align-internal.h>
f7a2be83 27#include <stdlib.h>
544d0515 28#include <stdint.h>
8f76831a 29#include <babeltrace/compat/mman-internal.h>
108e5a1e 30#include <babeltrace/common-internal.h>
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31
32/*
33 * This header implements a wrapper over mmap (mmap_align) that memory
34 * maps a file region that is not necessarily multiple of the page size.
35 * It returns a structure (instead of a pointer) that contains the mmap
36 * pointer (page-aligned) and a pointer to the offset requested within
37 * that page. Note: in the current implementation, the "addr" parameter
38 * cannot be forced, so we allocate at an address chosen by the OS.
39 */
40
41struct mmap_align {
42 void *page_aligned_addr; /* mmap address, aligned to floor */
43 size_t page_aligned_length; /* mmap length, containing range */
44
45 void *addr; /* virtual mmap address */
46 size_t length; /* virtual mmap length */
47};
48
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49#ifdef __WIN32__
50#include <windows.h>
51
52/*
53 * On windows the memory mapping offset must be aligned to the memory
54 * allocator allocation granularity and not the page size.
55 */
56static inline
57off_t get_page_aligned_offset(off_t offset, size_t page_size)
58{
59 SYSTEM_INFO sysinfo;
60
61 GetNativeSystemInfo(&sysinfo);
62
63 return ALIGN_FLOOR(offset, sysinfo.dwAllocationGranularity);
64}
65#else
66static inline
67off_t get_page_aligned_offset(off_t offset, size_t page_size)
68{
69 return ALIGN_FLOOR(offset, page_size);
70}
71#endif
72
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73static inline
74struct mmap_align *mmap_align(size_t length, int prot,
75 int flags, int fd, off_t offset)
76{
77 struct mmap_align *mma;
78 off_t page_aligned_offset; /* mmap offset, aligned to floor */
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79 size_t page_size;
80
81 page_size = bt_common_get_page_size();
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82
83 mma = malloc(sizeof(*mma));
84 if (!mma)
85 return MAP_FAILED;
86 mma->length = length;
8f76831a 87 page_aligned_offset = get_page_aligned_offset(offset, page_size);
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88 /*
89 * Page aligned length needs to contain the requested range.
90 * E.g., for a small range that fits within a single page, we might
91 * require a 2 pages page_aligned_length if the range crosses a page
92 * boundary.
93 */
108e5a1e 94 mma->page_aligned_length = ALIGN(length + offset - page_aligned_offset, page_size);
04394229 95 mma->page_aligned_addr = bt_mmap(NULL, mma->page_aligned_length,
f7a2be83 96 prot, flags, fd, page_aligned_offset);
8f76831a 97 if (mma->page_aligned_addr == MAP_FAILED) {
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98 free(mma);
99 return MAP_FAILED;
100 }
544d0515 101 mma->addr = ((uint8_t *) mma->page_aligned_addr) + (offset - page_aligned_offset);
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102 return mma;
103}
104
105static inline
106int munmap_align(struct mmap_align *mma)
107{
108 void *page_aligned_addr;
109 size_t page_aligned_length;
110
111 page_aligned_addr = mma->page_aligned_addr;
112 page_aligned_length = mma->page_aligned_length;
113 free(mma);
04394229 114 return bt_munmap(page_aligned_addr, page_aligned_length);
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115}
116
117static inline
118void *mmap_align_addr(struct mmap_align *mma)
119{
120 return mma->addr;
121}
122
123/*
124 * Helper for special-cases, normally unused.
125 */
126static inline
127void mmap_align_set_addr(struct mmap_align *mma, void *addr)
128{
129 mma->addr = addr;
130}
131
132#endif /* _BABELTRACE_MMAP_ALIGN_H */
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