stdlib_test.cpp revision 877ec6d90418ff1d6597147d355a2229fdffae7e 
1/*
2 * Copyright (C) 2012 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 <gtest/gtest.h>
18
19#include <errno.h>
20#include <libgen.h>
21#include <limits.h>
22#include <pthread.h>
23#include <stdint.h>
24#include <stdlib.h>
25
26TEST(stdlib, drand48) {
27  srand48(0x01020304);
28  EXPECT_DOUBLE_EQ(0.65619299195623526, drand48());
29  EXPECT_DOUBLE_EQ(0.18522597229772941, drand48());
30  EXPECT_DOUBLE_EQ(0.42015087072844537, drand48());
31  EXPECT_DOUBLE_EQ(0.061637783047395089, drand48());
32}
33
34TEST(stdlib, lrand48_random_rand) {
35  srand48(0x01020304);
36  EXPECT_EQ(1409163720, lrand48());
37  EXPECT_EQ(397769746, lrand48());
38  EXPECT_EQ(902267124, lrand48());
39  EXPECT_EQ(132366131, lrand48());
40
41#if __BIONIC__
42  // On bionic, random(3) is equivalent to lrand48...
43  srandom(0x01020304);
44  EXPECT_EQ(1409163720, random());
45  EXPECT_EQ(397769746, random());
46  EXPECT_EQ(902267124, random());
47  EXPECT_EQ(132366131, random());
48
49  // ...and rand(3) is the bottom 32 bits.
50  srand(0x01020304);
51  EXPECT_EQ(static_cast<int>(1409163720), rand());
52  EXPECT_EQ(static_cast<int>(397769746), rand());
53  EXPECT_EQ(static_cast<int>(902267124), rand());
54  EXPECT_EQ(static_cast<int>(132366131), rand());
55#endif
56}
57
58TEST(stdlib, mrand48) {
59  srand48(0x01020304);
60  EXPECT_EQ(-1476639856, mrand48());
61  EXPECT_EQ(795539493, mrand48());
62  EXPECT_EQ(1804534249, mrand48());
63  EXPECT_EQ(264732262, mrand48());
64}
65
66TEST(stdlib, posix_memalign) {
67  void* p;
68
69  ASSERT_EQ(0, posix_memalign(&p, 512, 128));
70  ASSERT_EQ(0U, reinterpret_cast<uintptr_t>(p) % 512);
71  free(p);
72
73  // Can't align to a non-power of 2.
74  ASSERT_EQ(EINVAL, posix_memalign(&p, 81, 128));
75}
76
77TEST(stdlib, realpath__NULL_filename) {
78  errno = 0;
79  char* p = realpath(NULL, NULL);
80  ASSERT_TRUE(p == NULL);
81  ASSERT_EQ(EINVAL, errno);
82}
83
84TEST(stdlib, realpath__empty_filename) {
85  errno = 0;
86  char* p = realpath("", NULL);
87  ASSERT_TRUE(p == NULL);
88  ASSERT_EQ(ENOENT, errno);
89}
90
91TEST(stdlib, realpath__ENOENT) {
92  errno = 0;
93  char* p = realpath("/this/directory/path/almost/certainly/does/not/exist", NULL);
94  ASSERT_TRUE(p == NULL);
95  ASSERT_EQ(ENOENT, errno);
96}
97
98TEST(stdlib, realpath) {
99  // Get the name of this executable.
100  char executable_path[PATH_MAX];
101  int rc = readlink("/proc/self/exe", executable_path, sizeof(executable_path));
102  ASSERT_NE(rc, -1);
103  executable_path[rc] = '\0';
104
105  char buf[PATH_MAX + 1];
106  char* p = realpath("/proc/self/exe", buf);
107  ASSERT_STREQ(executable_path, p);
108
109  p = realpath("/proc/self/exe", NULL);
110  ASSERT_STREQ(executable_path, p);
111  free(p);
112}
113
114TEST(stdlib, qsort) {
115  struct s {
116    char name[16];
117    static int comparator(const void* lhs, const void* rhs) {
118      return strcmp(reinterpret_cast<const s*>(lhs)->name, reinterpret_cast<const s*>(rhs)->name);
119    }
120  };
121  s entries[3];
122  strcpy(entries[0].name, "charlie");
123  strcpy(entries[1].name, "bravo");
124  strcpy(entries[2].name, "alpha");
125
126  qsort(entries, 3, sizeof(s), s::comparator);
127  ASSERT_STREQ("alpha", entries[0].name);
128  ASSERT_STREQ("bravo", entries[1].name);
129  ASSERT_STREQ("charlie", entries[2].name);
130
131  qsort(entries, 3, sizeof(s), s::comparator);
132  ASSERT_STREQ("alpha", entries[0].name);
133  ASSERT_STREQ("bravo", entries[1].name);
134  ASSERT_STREQ("charlie", entries[2].name);
135}
136
137static void* TestBug57421_child(void* arg) {
138  pthread_t main_thread = reinterpret_cast<pthread_t>(arg);
139  pthread_join(main_thread, NULL);
140  char* value = getenv("ENVIRONMENT_VARIABLE");
141  if (value == NULL) {
142    setenv("ENVIRONMENT_VARIABLE", "value", 1);
143  }
144  return NULL;
145}
146
147static void TestBug57421_main() {
148  pthread_t t;
149  ASSERT_EQ(0, pthread_create(&t, NULL, TestBug57421_child, reinterpret_cast<void*>(pthread_self())));
150  pthread_exit(NULL);
151}
152
153// Even though this isn't really a death test, we have to say "DeathTest" here so gtest knows to
154// run this test (which exits normally) in its own process.
155TEST(stdlib_DeathTest, getenv_after_main_thread_exits) {
156  // https://code.google.com/p/android/issues/detail?id=57421
157  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
158  ASSERT_EXIT(TestBug57421_main(), ::testing::ExitedWithCode(0), "");
159}
160