1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "src/base/test/vm_test_utils.h"
18
19 #include <memory>
20
21 #include <errno.h>
22 #include <string.h>
23 #include <sys/mman.h>
24 #include <sys/stat.h>
25
26 #include "gtest/gtest.h"
27 #include "perfetto/base/build_config.h"
28
29 namespace perfetto {
30 namespace base {
31 namespace vm_test_utils {
32
IsMapped(void * start,size_t size)33 bool IsMapped(void* start, size_t size) {
34 #if PERFETTO_BUILDFLAG(PERFETTO_OS_MACOSX)
35 using PageState = char;
36 static constexpr PageState kIncoreMask = MINCORE_INCORE;
37 #else
38 using PageState = unsigned char;
39 static constexpr PageState kIncoreMask = 1;
40 #endif
41 EXPECT_EQ(0u, size % 4096);
42 const size_t num_pages = size / 4096;
43 std::unique_ptr<PageState[]> page_states(new PageState[num_pages]);
44 memset(page_states.get(), 0, num_pages * sizeof(PageState));
45 int res = mincore(start, size, page_states.get());
46 // Linux returns ENOMEM when an unmapped memory range is passed.
47 // MacOS instead returns 0 but leaves the page_states empty.
48 if (res == -1 && errno == ENOMEM)
49 return false;
50 EXPECT_EQ(0, res);
51 for (size_t i = 0; i < num_pages; i++) {
52 if (!(page_states[i] & kIncoreMask))
53 return false;
54 }
55 return true;
56 }
57
58 } // namespace vm_test_utils
59 } // namespace base
60 } // namespace perfetto
61