stdlib_test.cpp revision 3cdf5739cd34757943a5fff9d26efeb8da04cb09 
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#include "TemporaryFile.h"
19
20#include <errno.h>
21#include <libgen.h>
22#include <limits.h>
23#include <pthread.h>
24#include <stdint.h>
25#include <stdlib.h>
26#include <fcntl.h>
27
28TEST(stdlib, drand48) {
29  srand48(0x01020304);
30  EXPECT_DOUBLE_EQ(0.65619299195623526, drand48());
31  EXPECT_DOUBLE_EQ(0.18522597229772941, drand48());
32  EXPECT_DOUBLE_EQ(0.42015087072844537, drand48());
33  EXPECT_DOUBLE_EQ(0.061637783047395089, drand48());
34}
35
36TEST(stdlib, lrand48_random_rand) {
37  srand48(0x01020304);
38  EXPECT_EQ(1409163720, lrand48());
39  EXPECT_EQ(397769746, lrand48());
40  EXPECT_EQ(902267124, lrand48());
41  EXPECT_EQ(132366131, lrand48());
42
43#if __BIONIC__
44  // On bionic, random(3) is equivalent to lrand48...
45  srandom(0x01020304);
46  EXPECT_EQ(1409163720, random());
47  EXPECT_EQ(397769746, random());
48  EXPECT_EQ(902267124, random());
49  EXPECT_EQ(132366131, random());
50
51  // ...and rand(3) is the bottom 32 bits.
52  srand(0x01020304);
53  EXPECT_EQ(static_cast<int>(1409163720), rand());
54  EXPECT_EQ(static_cast<int>(397769746), rand());
55  EXPECT_EQ(static_cast<int>(902267124), rand());
56  EXPECT_EQ(static_cast<int>(132366131), rand());
57#endif
58}
59
60TEST(stdlib, mrand48) {
61  srand48(0x01020304);
62  EXPECT_EQ(-1476639856, mrand48());
63  EXPECT_EQ(795539493, mrand48());
64  EXPECT_EQ(1804534249, mrand48());
65  EXPECT_EQ(264732262, mrand48());
66}
67
68TEST(stdlib, posix_memalign) {
69  void* p;
70
71  ASSERT_EQ(0, posix_memalign(&p, 512, 128));
72  ASSERT_EQ(0U, reinterpret_cast<uintptr_t>(p) % 512);
73  free(p);
74
75  // Can't align to a non-power of 2.
76  ASSERT_EQ(EINVAL, posix_memalign(&p, 81, 128));
77}
78
79TEST(stdlib, realpath__NULL_filename) {
80  errno = 0;
81  char* p = realpath(NULL, NULL);
82  ASSERT_TRUE(p == NULL);
83  ASSERT_EQ(EINVAL, errno);
84}
85
86TEST(stdlib, realpath__empty_filename) {
87  errno = 0;
88  char* p = realpath("", NULL);
89  ASSERT_TRUE(p == NULL);
90  ASSERT_EQ(ENOENT, errno);
91}
92
93TEST(stdlib, realpath__ENOENT) {
94  errno = 0;
95  char* p = realpath("/this/directory/path/almost/certainly/does/not/exist", NULL);
96  ASSERT_TRUE(p == NULL);
97  ASSERT_EQ(ENOENT, errno);
98}
99
100TEST(stdlib, realpath) {
101  // Get the name of this executable.
102  char executable_path[PATH_MAX];
103  int rc = readlink("/proc/self/exe", executable_path, sizeof(executable_path));
104  ASSERT_NE(rc, -1);
105  executable_path[rc] = '\0';
106
107  char buf[PATH_MAX + 1];
108  char* p = realpath("/proc/self/exe", buf);
109  ASSERT_STREQ(executable_path, p);
110
111  p = realpath("/proc/self/exe", NULL);
112  ASSERT_STREQ(executable_path, p);
113  free(p);
114}
115
116TEST(stdlib, qsort) {
117  struct s {
118    char name[16];
119    static int comparator(const void* lhs, const void* rhs) {
120      return strcmp(reinterpret_cast<const s*>(lhs)->name, reinterpret_cast<const s*>(rhs)->name);
121    }
122  };
123  s entries[3];
124  strcpy(entries[0].name, "charlie");
125  strcpy(entries[1].name, "bravo");
126  strcpy(entries[2].name, "alpha");
127
128  qsort(entries, 3, sizeof(s), s::comparator);
129  ASSERT_STREQ("alpha", entries[0].name);
130  ASSERT_STREQ("bravo", entries[1].name);
131  ASSERT_STREQ("charlie", entries[2].name);
132
133  qsort(entries, 3, sizeof(s), s::comparator);
134  ASSERT_STREQ("alpha", entries[0].name);
135  ASSERT_STREQ("bravo", entries[1].name);
136  ASSERT_STREQ("charlie", entries[2].name);
137}
138
139static void* TestBug57421_child(void* arg) {
140  pthread_t main_thread = reinterpret_cast<pthread_t>(arg);
141  pthread_join(main_thread, NULL);
142  char* value = getenv("ENVIRONMENT_VARIABLE");
143  if (value == NULL) {
144    setenv("ENVIRONMENT_VARIABLE", "value", 1);
145  }
146  return NULL;
147}
148
149static void TestBug57421_main() {
150  pthread_t t;
151  ASSERT_EQ(0, pthread_create(&t, NULL, TestBug57421_child, reinterpret_cast<void*>(pthread_self())));
152  pthread_exit(NULL);
153}
154
155// Even though this isn't really a death test, we have to say "DeathTest" here so gtest knows to
156// run this test (which exits normally) in its own process.
157TEST(stdlib_DeathTest, getenv_after_main_thread_exits) {
158  // https://code.google.com/p/android/issues/detail?id=57421
159  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
160  ASSERT_EXIT(TestBug57421_main(), ::testing::ExitedWithCode(0), "");
161}
162
163TEST(stdlib, mkstemp) {
164  TemporaryFile tf;
165  struct stat sb;
166  ASSERT_EQ(0, fstat(tf.fd, &sb));
167}
168
169TEST(stdlib, mkstemp64) {
170  GenericTemporaryFile<mkstemp64> tf;
171  struct stat64 sb;
172  ASSERT_EQ(0, fstat64(tf.fd, &sb));
173  ASSERT_EQ(O_LARGEFILE, fcntl(tf.fd, F_GETFL) & O_LARGEFILE);
174}
175
176TEST(stdlib, system) {
177  int status;
178
179  status = system("exit 0");
180  ASSERT_TRUE(WIFEXITED(status));
181  ASSERT_EQ(0, WEXITSTATUS(status));
182
183  status = system("exit 1");
184  ASSERT_TRUE(WIFEXITED(status));
185  ASSERT_EQ(1, WEXITSTATUS(status));
186}
187