system_properties_test.cpp revision bd6dc6a8864a1997eb8608030ac816740169c463 
1/*
2 * Copyright (C) 2013 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 <sys/wait.h>
19#include <unistd.h>
20#include <string>
21
22#if __BIONIC__
23
24#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
25#include <sys/_system_properties.h>
26
27extern void *__system_property_area__;
28
29struct LocalPropertyTestState {
30    LocalPropertyTestState() : valid(false) {
31        char dir_template[] = "/data/local/tmp/prop-XXXXXX";
32        char *dirname = mkdtemp(dir_template);
33        if (!dirname) {
34            perror("making temp file for test state failed (is /data/local/tmp writable?)");
35            return;
36        }
37
38        old_pa = __system_property_area__;
39        __system_property_area__ = NULL;
40
41        pa_dirname = dirname;
42        pa_filename = pa_dirname + "/__properties__";
43
44        __system_property_set_filename(pa_filename.c_str());
45        __system_property_area_init();
46        valid = true;
47    }
48
49    ~LocalPropertyTestState() {
50        if (!valid)
51            return;
52
53        __system_property_area__ = old_pa;
54
55        __system_property_set_filename(PROP_FILENAME);
56        unlink(pa_filename.c_str());
57        rmdir(pa_dirname.c_str());
58    }
59public:
60    bool valid;
61private:
62    std::string pa_dirname;
63    std::string pa_filename;
64    void *old_pa;
65};
66
67TEST(properties, add) {
68    LocalPropertyTestState pa;
69    ASSERT_TRUE(pa.valid);
70
71    char propvalue[PROP_VALUE_MAX];
72
73    ASSERT_EQ(0, __system_property_add("property", 8, "value1", 6));
74    ASSERT_EQ(0, __system_property_add("other_property", 14, "value2", 6));
75    ASSERT_EQ(0, __system_property_add("property_other", 14, "value3", 6));
76
77    ASSERT_EQ(6, __system_property_get("property", propvalue));
78    ASSERT_STREQ(propvalue, "value1");
79
80    ASSERT_EQ(6, __system_property_get("other_property", propvalue));
81    ASSERT_STREQ(propvalue, "value2");
82
83    ASSERT_EQ(6, __system_property_get("property_other", propvalue));
84    ASSERT_STREQ(propvalue, "value3");
85}
86
87TEST(properties, update) {
88    LocalPropertyTestState pa;
89    ASSERT_TRUE(pa.valid);
90
91    char propvalue[PROP_VALUE_MAX];
92    prop_info *pi;
93
94    ASSERT_EQ(0, __system_property_add("property", 8, "oldvalue1", 9));
95    ASSERT_EQ(0, __system_property_add("other_property", 14, "value2", 6));
96    ASSERT_EQ(0, __system_property_add("property_other", 14, "value3", 6));
97
98    pi = (prop_info *)__system_property_find("property");
99    ASSERT_NE((prop_info *)NULL, pi);
100    __system_property_update(pi, "value4", 6);
101
102    pi = (prop_info *)__system_property_find("other_property");
103    ASSERT_NE((prop_info *)NULL, pi);
104    __system_property_update(pi, "newvalue5", 9);
105
106    pi = (prop_info *)__system_property_find("property_other");
107    ASSERT_NE((prop_info *)NULL, pi);
108    __system_property_update(pi, "value6", 6);
109
110    ASSERT_EQ(6, __system_property_get("property", propvalue));
111    ASSERT_STREQ(propvalue, "value4");
112
113    ASSERT_EQ(9, __system_property_get("other_property", propvalue));
114    ASSERT_STREQ(propvalue, "newvalue5");
115
116    ASSERT_EQ(6, __system_property_get("property_other", propvalue));
117    ASSERT_STREQ(propvalue, "value6");
118}
119
120TEST(properties, fill) {
121    LocalPropertyTestState pa;
122    ASSERT_TRUE(pa.valid);
123    char prop_name[PROP_NAME_MAX];
124    char prop_value[PROP_VALUE_MAX];
125    char prop_value_ret[PROP_VALUE_MAX];
126    int count = 0;
127    int ret;
128
129    while (true) {
130        ret = snprintf(prop_name, PROP_NAME_MAX - 1, "property_%d", count);
131        memset(prop_name + ret, 'a', PROP_NAME_MAX - 1 - ret);
132        ret = snprintf(prop_value, PROP_VALUE_MAX - 1, "value_%d", count);
133        memset(prop_value + ret, 'b', PROP_VALUE_MAX - 1 - ret);
134        prop_name[PROP_NAME_MAX - 1] = 0;
135        prop_value[PROP_VALUE_MAX - 1] = 0;
136
137        ret = __system_property_add(prop_name, PROP_NAME_MAX - 1, prop_value, PROP_VALUE_MAX - 1);
138        if (ret < 0)
139            break;
140
141        count++;
142    }
143
144    // For historical reasons at least 247 properties must be supported
145    ASSERT_GE(count, 247);
146
147    for (int i = 0; i < count; i++) {
148        ret = snprintf(prop_name, PROP_NAME_MAX - 1, "property_%d", i);
149        memset(prop_name + ret, 'a', PROP_NAME_MAX - 1 - ret);
150        ret = snprintf(prop_value, PROP_VALUE_MAX - 1, "value_%d", i);
151        memset(prop_value + ret, 'b', PROP_VALUE_MAX - 1 - ret);
152        prop_name[PROP_NAME_MAX - 1] = 0;
153        prop_value[PROP_VALUE_MAX - 1] = 0;
154        memset(prop_value_ret, '\0', PROP_VALUE_MAX);
155
156        ASSERT_EQ(PROP_VALUE_MAX - 1, __system_property_get(prop_name, prop_value_ret));
157        ASSERT_EQ(0, memcmp(prop_value, prop_value_ret, PROP_VALUE_MAX));
158    }
159}
160
161static void foreach_test_callback(const prop_info *pi, void* cookie) {
162    size_t *count = static_cast<size_t *>(cookie);
163
164    ASSERT_NE((prop_info *)NULL, pi);
165    (*count)++;
166}
167
168TEST(properties, foreach) {
169    LocalPropertyTestState pa;
170    ASSERT_TRUE(pa.valid);
171    size_t count = 0;
172
173    ASSERT_EQ(0, __system_property_add("property", 8, "value1", 6));
174    ASSERT_EQ(0, __system_property_add("other_property", 14, "value2", 6));
175    ASSERT_EQ(0, __system_property_add("property_other", 14, "value3", 6));
176
177    ASSERT_EQ(0, __system_property_foreach(foreach_test_callback, &count));
178    ASSERT_EQ(3U, count);
179}
180
181TEST(properties, find_nth) {
182    LocalPropertyTestState pa;
183    ASSERT_TRUE(pa.valid);
184
185    ASSERT_EQ(0, __system_property_add("property", 8, "value1", 6));
186    ASSERT_EQ(0, __system_property_add("other_property", 14, "value2", 6));
187    ASSERT_EQ(0, __system_property_add("property_other", 14, "value3", 6));
188
189    ASSERT_NE((const prop_info *)NULL, __system_property_find_nth(0));
190    ASSERT_NE((const prop_info *)NULL, __system_property_find_nth(1));
191    ASSERT_NE((const prop_info *)NULL, __system_property_find_nth(2));
192
193    ASSERT_EQ((const prop_info *)NULL, __system_property_find_nth(3));
194    ASSERT_EQ((const prop_info *)NULL, __system_property_find_nth(4));
195    ASSERT_EQ((const prop_info *)NULL, __system_property_find_nth(5));
196    ASSERT_EQ((const prop_info *)NULL, __system_property_find_nth(100));
197    ASSERT_EQ((const prop_info *)NULL, __system_property_find_nth(200));
198    ASSERT_EQ((const prop_info *)NULL, __system_property_find_nth(247));
199}
200
201TEST(properties, errors) {
202    LocalPropertyTestState pa;
203    ASSERT_TRUE(pa.valid);
204    char prop_value[PROP_NAME_MAX];
205
206    ASSERT_EQ(0, __system_property_add("property", 8, "value1", 6));
207    ASSERT_EQ(0, __system_property_add("other_property", 14, "value2", 6));
208    ASSERT_EQ(0, __system_property_add("property_other", 14, "value3", 6));
209
210    ASSERT_EQ(0, __system_property_find("property1"));
211    ASSERT_EQ(0, __system_property_get("property1", prop_value));
212
213    ASSERT_EQ(-1, __system_property_add("name", PROP_NAME_MAX, "value", 5));
214    ASSERT_EQ(-1, __system_property_add("name", 4, "value", PROP_VALUE_MAX));
215    ASSERT_EQ(-1, __system_property_update(NULL, "value", PROP_VALUE_MAX));
216}
217
218TEST(properties, serial) {
219    LocalPropertyTestState pa;
220    ASSERT_TRUE(pa.valid);
221    const prop_info *pi;
222    unsigned int serial;
223
224    ASSERT_EQ(0, __system_property_add("property", 8, "value1", 6));
225    ASSERT_NE((const prop_info *)NULL, pi = __system_property_find("property"));
226    serial = __system_property_serial(pi);
227    ASSERT_EQ(0, __system_property_update((prop_info *)pi, "value2", 6));
228    ASSERT_NE(serial, __system_property_serial(pi));
229}
230
231static void *PropertyWaitHelperFn(void *arg)
232{
233    int *flag = (int *)arg;
234    prop_info *pi;
235    pi = (prop_info *)__system_property_find("property");
236    usleep(100000);
237
238    *flag = 1;
239    __system_property_update(pi, "value3", 6);
240
241    return NULL;
242}
243
244TEST(properties, wait) {
245    LocalPropertyTestState pa;
246    ASSERT_TRUE(pa.valid);
247    unsigned int serial;
248    prop_info *pi;
249    pthread_t t;
250    int flag = 0;
251
252    ASSERT_EQ(0, __system_property_add("property", 8, "value1", 6));
253    serial = __system_property_wait_any(0);
254    pi = (prop_info *)__system_property_find("property");
255    ASSERT_NE((prop_info *)NULL, pi);
256    __system_property_update(pi, "value2", 6);
257    serial = __system_property_wait_any(serial);
258
259    ASSERT_EQ(0, pthread_create(&t, NULL, PropertyWaitHelperFn, &flag));
260    ASSERT_EQ(flag, 0);
261    serial = __system_property_wait_any(serial);
262    ASSERT_EQ(flag, 1);
263
264    void* result;
265    ASSERT_EQ(0, pthread_join(t, &result));
266}
267
268class KilledByFault {
269    public:
270        explicit KilledByFault() {};
271        bool operator()(int exit_status) const;
272};
273
274bool KilledByFault::operator()(int exit_status) const {
275    return WIFSIGNALED(exit_status) &&
276        (WTERMSIG(exit_status) == SIGSEGV ||
277         WTERMSIG(exit_status) == SIGBUS ||
278         WTERMSIG(exit_status) == SIGABRT);
279}
280
281TEST(properties_DeathTest, read_only) {
282      ::testing::FLAGS_gtest_death_test_style = "threadsafe";
283      ASSERT_EXIT(__system_property_add("property", 8, "value", 5),
284                  KilledByFault(), "");
285}
286#endif
287