]>
Commit | Line | Data |
---|---|---|
1d09f67e TL |
1 | // Licensed to the Apache Software Foundation (ASF) under one |
2 | // or more contributor license agreements. See the NOTICE file | |
3 | // distributed with this work for additional information | |
4 | // regarding copyright ownership. The ASF licenses this file | |
5 | // to you under the Apache License, Version 2.0 (the | |
6 | // "License"); you may not use this file except in compliance | |
7 | // with the License. You may obtain a copy of the License at | |
8 | // | |
9 | // http://www.apache.org/licenses/LICENSE-2.0 | |
10 | // | |
11 | // Unless required by applicable law or agreed to in writing, | |
12 | // software distributed under the License is distributed on an | |
13 | // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
14 | // KIND, either express or implied. See the License for the | |
15 | // specific language governing permissions and limitations | |
16 | // under the License. | |
17 | ||
18 | #include "plasma/malloc.h" | |
19 | ||
20 | #include <assert.h> | |
21 | #include <stddef.h> | |
22 | #include <stdio.h> | |
23 | #include <stdlib.h> | |
24 | #include <string.h> | |
25 | #include <sys/mman.h> | |
26 | #include <unistd.h> | |
27 | ||
28 | #include <cerrno> | |
29 | #include <string> | |
30 | #include <vector> | |
31 | ||
32 | #include "plasma/common.h" | |
33 | #include "plasma/plasma.h" | |
34 | ||
35 | namespace plasma { | |
36 | ||
37 | std::unordered_map<void*, MmapRecord> mmap_records; | |
38 | ||
39 | static void* pointer_advance(void* p, ptrdiff_t n) { return (unsigned char*)p + n; } | |
40 | ||
41 | static ptrdiff_t pointer_distance(void const* pfrom, void const* pto) { | |
42 | return (unsigned char const*)pto - (unsigned char const*)pfrom; | |
43 | } | |
44 | ||
45 | void GetMallocMapinfo(void* addr, int* fd, int64_t* map_size, ptrdiff_t* offset) { | |
46 | // TODO(rshin): Implement a more efficient search through mmap_records. | |
47 | for (const auto& entry : mmap_records) { | |
48 | if (addr >= entry.first && addr < pointer_advance(entry.first, entry.second.size)) { | |
49 | *fd = entry.second.fd; | |
50 | *map_size = entry.second.size; | |
51 | *offset = pointer_distance(entry.first, addr); | |
52 | return; | |
53 | } | |
54 | } | |
55 | *fd = -1; | |
56 | *map_size = 0; | |
57 | *offset = 0; | |
58 | } | |
59 | ||
60 | int64_t GetMmapSize(int fd) { | |
61 | for (const auto& entry : mmap_records) { | |
62 | if (entry.second.fd == fd) { | |
63 | return entry.second.size; | |
64 | } | |
65 | } | |
66 | ARROW_LOG(FATAL) << "failed to find entry in mmap_records for fd " << fd; | |
67 | return -1; // This code is never reached. | |
68 | } | |
69 | ||
70 | } // namespace plasma |