stdlib_test.cpp revision 9f525644df99cb2f7f81a23ca23840f0a8f82275 
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#include <sys/types.h>
28#include <sys/wait.h>
29
30TEST(stdlib, drand48) {
31  srand48(0x01020304);
32  EXPECT_DOUBLE_EQ(0.65619299195623526, drand48());
33  EXPECT_DOUBLE_EQ(0.18522597229772941, drand48());
34  EXPECT_DOUBLE_EQ(0.42015087072844537, drand48());
35  EXPECT_DOUBLE_EQ(0.061637783047395089, drand48());
36}
37
38TEST(stdlib, lrand48_random_rand) {
39  srand48(0x01020304);
40  EXPECT_EQ(1409163720, lrand48());
41  EXPECT_EQ(397769746, lrand48());
42  EXPECT_EQ(902267124, lrand48());
43  EXPECT_EQ(132366131, lrand48());
44
45#if __BIONIC__
46  // On bionic, random(3) is equivalent to lrand48...
47  srandom(0x01020304);
48  EXPECT_EQ(1409163720, random());
49  EXPECT_EQ(397769746, random());
50  EXPECT_EQ(902267124, random());
51  EXPECT_EQ(132366131, random());
52
53  // ...and rand(3) is the bottom 32 bits.
54  srand(0x01020304);
55  EXPECT_EQ(static_cast<int>(1409163720), rand());
56  EXPECT_EQ(static_cast<int>(397769746), rand());
57  EXPECT_EQ(static_cast<int>(902267124), rand());
58  EXPECT_EQ(static_cast<int>(132366131), rand());
59#endif
60}
61
62TEST(stdlib, mrand48) {
63  srand48(0x01020304);
64  EXPECT_EQ(-1476639856, mrand48());
65  EXPECT_EQ(795539493, mrand48());
66  EXPECT_EQ(1804534249, mrand48());
67  EXPECT_EQ(264732262, mrand48());
68}
69
70TEST(stdlib, posix_memalign) {
71  void* p;
72
73  ASSERT_EQ(0, posix_memalign(&p, 512, 128));
74  ASSERT_EQ(0U, reinterpret_cast<uintptr_t>(p) % 512);
75  free(p);
76
77  // Can't align to a non-power of 2.
78  ASSERT_EQ(EINVAL, posix_memalign(&p, 81, 128));
79}
80
81TEST(stdlib, realpath__NULL_filename) {
82  errno = 0;
83  char* p = realpath(NULL, NULL);
84  ASSERT_TRUE(p == NULL);
85  ASSERT_EQ(EINVAL, errno);
86}
87
88TEST(stdlib, realpath__empty_filename) {
89  errno = 0;
90  char* p = realpath("", NULL);
91  ASSERT_TRUE(p == NULL);
92  ASSERT_EQ(ENOENT, errno);
93}
94
95TEST(stdlib, realpath__ENOENT) {
96  errno = 0;
97  char* p = realpath("/this/directory/path/almost/certainly/does/not/exist", NULL);
98  ASSERT_TRUE(p == NULL);
99  ASSERT_EQ(ENOENT, errno);
100}
101
102TEST(stdlib, realpath) {
103  // Get the name of this executable.
104  char executable_path[PATH_MAX];
105  int rc = readlink("/proc/self/exe", executable_path, sizeof(executable_path));
106  ASSERT_NE(rc, -1);
107  executable_path[rc] = '\0';
108
109  char buf[PATH_MAX + 1];
110  char* p = realpath("/proc/self/exe", buf);
111  ASSERT_STREQ(executable_path, p);
112
113  p = realpath("/proc/self/exe", NULL);
114  ASSERT_STREQ(executable_path, p);
115  free(p);
116}
117
118TEST(stdlib, qsort) {
119  struct s {
120    char name[16];
121    static int comparator(const void* lhs, const void* rhs) {
122      return strcmp(reinterpret_cast<const s*>(lhs)->name, reinterpret_cast<const s*>(rhs)->name);
123    }
124  };
125  s entries[3];
126  strcpy(entries[0].name, "charlie");
127  strcpy(entries[1].name, "bravo");
128  strcpy(entries[2].name, "alpha");
129
130  qsort(entries, 3, sizeof(s), s::comparator);
131  ASSERT_STREQ("alpha", entries[0].name);
132  ASSERT_STREQ("bravo", entries[1].name);
133  ASSERT_STREQ("charlie", entries[2].name);
134
135  qsort(entries, 3, sizeof(s), s::comparator);
136  ASSERT_STREQ("alpha", entries[0].name);
137  ASSERT_STREQ("bravo", entries[1].name);
138  ASSERT_STREQ("charlie", entries[2].name);
139}
140
141static void* TestBug57421_child(void* arg) {
142  pthread_t main_thread = reinterpret_cast<pthread_t>(arg);
143  pthread_join(main_thread, NULL);
144  char* value = getenv("ENVIRONMENT_VARIABLE");
145  if (value == NULL) {
146    setenv("ENVIRONMENT_VARIABLE", "value", 1);
147  }
148  return NULL;
149}
150
151static void TestBug57421_main() {
152  pthread_t t;
153  ASSERT_EQ(0, pthread_create(&t, NULL, TestBug57421_child, reinterpret_cast<void*>(pthread_self())));
154  pthread_exit(NULL);
155}
156
157// Even though this isn't really a death test, we have to say "DeathTest" here so gtest knows to
158// run this test (which exits normally) in its own process.
159TEST(stdlib_DeathTest, getenv_after_main_thread_exits) {
160  // https://code.google.com/p/android/issues/detail?id=57421
161  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
162  ASSERT_EXIT(TestBug57421_main(), ::testing::ExitedWithCode(0), "");
163}
164
165TEST(stdlib, mkstemp) {
166  TemporaryFile tf;
167  struct stat sb;
168  ASSERT_EQ(0, fstat(tf.fd, &sb));
169}
170
171TEST(stdlib, mkstemp64) {
172  GenericTemporaryFile<mkstemp64> tf;
173  struct stat64 sb;
174  ASSERT_EQ(0, fstat64(tf.fd, &sb));
175  ASSERT_EQ(O_LARGEFILE, fcntl(tf.fd, F_GETFL) & O_LARGEFILE);
176}
177
178TEST(stdlib, system) {
179  int status;
180
181  status = system("exit 0");
182  ASSERT_TRUE(WIFEXITED(status));
183  ASSERT_EQ(0, WEXITSTATUS(status));
184
185  status = system("exit 1");
186  ASSERT_TRUE(WIFEXITED(status));
187  ASSERT_EQ(1, WEXITSTATUS(status));
188}
189
190TEST(stdlib, atof) {
191  ASSERT_DOUBLE_EQ(1.23, atof("1.23"));
192}
193
194TEST(stdlib, strtod) {
195  ASSERT_DOUBLE_EQ(1.23, strtod("1.23", NULL));
196}
197
198TEST(stdlib, strtof) {
199  ASSERT_FLOAT_EQ(1.23, strtof("1.23", NULL));
200}
201
202TEST(stdlib, strtold) {
203  ASSERT_DOUBLE_EQ(1.23, strtold("1.23", NULL));
204}
205
206TEST(unistd, _Exit) {
207  int pid = fork();
208  ASSERT_NE(-1, pid) << strerror(errno);
209
210  if (pid == 0) {
211    _Exit(99);
212  }
213
214  int status;
215  ASSERT_EQ(pid, waitpid(pid, &status, 0));
216  ASSERT_TRUE(WIFEXITED(status));
217  ASSERT_EQ(99, WEXITSTATUS(status));
218}
219