1 /*
2 * Copyright (C) 2020 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <dlfcn.h>
30 #include <err.h>
31 #include <fcntl.h>
32 #include <stdio.h>
33 #include <unistd.h>
34
35 #include <map>
36 #include <vector>
37
38 #include <gtest/gtest.h>
39
40 struct FdtrackFrame {
41 const char* function_name;
42 uint64_t function_offset;
43 };
44
RunFdtrack(std::function<void ()> f)45 std::map<int, std::vector<FdtrackFrame>> RunFdtrack(std::function<void()> f) {
46 void* libfdtrack = dlopen("libfdtrack.so", RTLD_NOW);
47 if (!libfdtrack) {
48 errx(1, "failed to dlopen libfdtrack.so: %s", dlerror());
49 }
50
51 using fdtrack_callback_t = bool (*)(int fd, const char* const* function_names,
52 const uint64_t* function_offsets, size_t count, void* arg);
53 auto fdtrack_iterate = reinterpret_cast<void (*)(fdtrack_callback_t, void* arg)>(
54 dlsym(libfdtrack, "fdtrack_iterate"));
55 if (!fdtrack_iterate) {
56 errx(1, "failed to dlsym fdtrack_iterate");
57 }
58
59 f();
60
61 std::map<int, std::vector<FdtrackFrame>> result;
62 fdtrack_iterate(
63 [](int fd, const char* const* function_names, const uint64_t* function_offsets, size_t count,
64 void* arg) {
65 auto& map = *static_cast<decltype(result)*>(arg);
66 for (size_t i = 0; i < count; ++i) {
67 map[fd].push_back(FdtrackFrame{
68 .function_name = function_names[i],
69 .function_offset = function_offsets[i],
70 });
71 }
72
73 return true;
74 },
75 &result);
76
77 return result;
78 }
79
TEST(fdtrack,open)80 TEST(fdtrack, open) {
81 static int fd = -1;
82 auto result = RunFdtrack([]() { fd = open("/dev/null", O_RDONLY | O_CLOEXEC); });
83
84 ASSERT_NE(-1, fd);
85 ASSERT_EQ(1, result.size());
86 ASSERT_EQ(fd, result.begin()->first);
87 ASSERT_NE(nullptr, strstr(result.begin()->second.at(0).function_name, "open"));
88 }
89
TEST(fdtrack,close)90 TEST(fdtrack, close) {
91 static int fd1 = -1;
92 static int fd2 = -1;
93 static int fd3 = -1;
94 auto result = RunFdtrack([]() {
95 fd1 = open("/dev/null", O_RDONLY | O_CLOEXEC);
96 fd2 = open("/dev/null", O_RDONLY | O_CLOEXEC);
97 fd3 = open("/dev/null", O_RDONLY | O_CLOEXEC);
98 close(fd2);
99 });
100
101 ASSERT_NE(-1, fd1);
102 ASSERT_NE(-1, fd2);
103 ASSERT_NE(-1, fd3);
104
105 ASSERT_EQ(2, result.size());
106 ASSERT_EQ(1, result.count(fd1));
107 ASSERT_EQ(1, result.count(fd3));
108
109 ASSERT_NE(nullptr, strstr(result[fd1].at(0).function_name, "open"));
110 ASSERT_NE(nullptr, strstr(result[fd3].at(0).function_name, "open"));
111 }
112