1 /*
2 * Copyright (C) 2014 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 <stdio_ext.h>
18
19 #include <gtest/gtest.h>
20
21 #include <errno.h>
22 #include <fcntl.h>
23 #include <limits.h>
24 #include <math.h>
25 #include <stdio.h>
26 #include <sys/types.h>
27 #include <sys/stat.h>
28 #include <unistd.h>
29 #include <wchar.h>
30 #include <locale.h>
31
32 #include <android-base/file.h>
33
34 #include "utils.h"
35
TEST(stdio_ext,__fbufsize)36 TEST(stdio_ext, __fbufsize) {
37 FILE* fp = fopen("/proc/version", "r");
38
39 // Initially, there's no buffer in case the first thing you do is disable buffering.
40 ASSERT_EQ(0U, __fbufsize(fp));
41
42 // A read forces a buffer to be created.
43 char buf[128];
44 fgets(buf, sizeof(buf), fp);
45 ASSERT_EQ(1024U, __fbufsize(fp));
46
47 ASSERT_EQ(0, setvbuf(fp, buf, _IOFBF, 1));
48 ASSERT_EQ(1U, __fbufsize(fp));
49
50 ASSERT_EQ(0, setvbuf(fp, buf, _IOFBF, 8));
51 ASSERT_EQ(8U, __fbufsize(fp));
52
53 fclose(fp);
54 }
55
TEST(stdio_ext,__flbf)56 TEST(stdio_ext, __flbf) {
57 FILE* fp = fopen("/proc/version", "r");
58
59 ASSERT_FALSE(__flbf(fp));
60
61 char buf[128];
62 ASSERT_EQ(0, setvbuf(fp, buf, _IOLBF, sizeof(buf)));
63
64 ASSERT_TRUE(__flbf(fp));
65
66 fclose(fp);
67 }
68
TEST(stdio_ext,__fpending)69 TEST(stdio_ext, __fpending) {
70 FILE* fp = fopen("/dev/null", "w");
71 ASSERT_EQ(0U, __fpending(fp));
72 ASSERT_EQ('x', fputc('x', fp));
73 ASSERT_EQ(1U, __fpending(fp));
74 ASSERT_EQ('y', fputc('y', fp));
75 ASSERT_EQ(2U, __fpending(fp));
76 fflush(fp);
77 ASSERT_EQ(0U, __fpending(fp));
78 fclose(fp);
79 }
80
TEST(stdio_ext,__fpurge)81 TEST(stdio_ext, __fpurge) {
82 FILE* fp = tmpfile();
83
84 ASSERT_EQ('a', fputc('a', fp));
85 ASSERT_EQ(1U, __fpending(fp));
86 __fpurge(fp);
87 ASSERT_EQ(0U, __fpending(fp));
88
89 ASSERT_EQ('b', fputc('b', fp));
90 ASSERT_EQ('\n', fputc('\n', fp));
91 ASSERT_EQ(2U, __fpending(fp));
92
93 rewind(fp);
94
95 char buf[16];
96 char* s = fgets(buf, sizeof(buf), fp);
97 ASSERT_TRUE(s != nullptr);
98 ASSERT_STREQ("b\n", s);
99
100 fclose(fp);
101 }
102
TEST(stdio_ext,_flushlbf)103 TEST(stdio_ext, _flushlbf) {
104 FILE* fp = fopen("/dev/null", "w");
105
106 char buf[128];
107 ASSERT_EQ(0, setvbuf(fp, buf, _IOLBF, sizeof(buf)));
108
109 ASSERT_EQ('a', fputc('a', fp));
110 ASSERT_EQ(1U, __fpending(fp));
111
112 _flushlbf();
113
114 ASSERT_EQ(0U, __fpending(fp));
115
116 fclose(fp);
117 }
118
TEST(stdio_ext,__freadable__fwritable)119 TEST(stdio_ext, __freadable__fwritable) {
120 FILE* fp;
121
122 // Read-only.
123 fp = fopen("/dev/null", "r");
124 ASSERT_TRUE(__freadable(fp));
125 ASSERT_FALSE(__fwritable(fp));
126 fclose(fp);
127
128 // Write-only.
129 fp = fopen("/dev/null", "w");
130 ASSERT_FALSE(__freadable(fp));
131 ASSERT_TRUE(__fwritable(fp));
132 fclose(fp);
133
134 // Append (aka write-only).
135 fp = fopen("/dev/null", "a");
136 ASSERT_FALSE(__freadable(fp));
137 ASSERT_TRUE(__fwritable(fp));
138 fclose(fp);
139
140 // The three read-write modes.
141 for (auto read_write_mode : {"r+", "w+", "a+"}) {
142 fp = fopen("/dev/null", read_write_mode);
143 ASSERT_TRUE(__freadable(fp));
144 ASSERT_TRUE(__fwritable(fp));
145 fclose(fp);
146 }
147 }
148
TEST(stdio_ext,__freading__fwriting)149 TEST(stdio_ext, __freading__fwriting) {
150 FILE* fp;
151
152 // Append (aka write-only). Never reading. Always writing.
153 fp = fopen("/dev/zero", "a");
154 ASSERT_FALSE(__freading(fp)); // Not reading initially.
155 ASSERT_TRUE(__fwriting(fp)); // Writing initially.
156 ASSERT_TRUE(fputc('x', fp) != EOF);
157 ASSERT_FALSE(__freading(fp)); // Not reading after write.
158 ASSERT_TRUE(__fwriting(fp)); // Still writing after write.
159 fclose(fp);
160
161 // Write-only. Never reading. Always writing.
162 fp = fopen("/dev/zero", "w");
163 ASSERT_FALSE(__freading(fp)); // Not reading initially.
164 ASSERT_TRUE(__fwriting(fp)); // Writing initially.
165 ASSERT_TRUE(fputc('x', fp) != EOF);
166 ASSERT_FALSE(__freading(fp)); // Not reading after write.
167 ASSERT_TRUE(__fwriting(fp)); // Still writing after write.
168 fclose(fp);
169
170 // Read-only. Always reading. Never writing.
171 fp = fopen("/dev/zero", "r");
172 ASSERT_TRUE(__freading(fp)); // Reading initially.
173 ASSERT_FALSE(__fwriting(fp)); // Not writing initially.
174 ASSERT_TRUE(fgetc(fp) == 0);
175 ASSERT_TRUE(__freading(fp)); // Still reading after read.
176 ASSERT_FALSE(__fwriting(fp)); // Still not writing after read.
177 fclose(fp);
178
179 // The three read-write modes.
180 for (auto read_write_mode : {"r+", "w+", "a+"}) {
181 fp = fopen("/dev/zero", read_write_mode);
182 ASSERT_FALSE(__freading(fp)); // Not reading initially.
183 ASSERT_FALSE(__fwriting(fp)); // Not writing initially.
184 ASSERT_TRUE(fgetc(fp) == 0);
185 ASSERT_TRUE(__freading(fp)); // Reading after read.
186 ASSERT_FALSE(__fwriting(fp)); // Not writing after read.
187 ASSERT_TRUE(fputc('x', fp) != EOF);
188 ASSERT_FALSE(__freading(fp)); // Not reading after write.
189 ASSERT_TRUE(__fwriting(fp)); // Writing after write.
190 fclose(fp);
191 }
192 }
193
TEST(stdio_ext,__fseterr)194 TEST(stdio_ext, __fseterr) {
195 #if defined(__GLIBC__)
196 GTEST_SKIP() << "glibc doesn't have __fseterr, but gnulib will use it";
197 #else
198 FILE* fp = fopen("/dev/null", "w");
199
200 ASSERT_FALSE(ferror(fp));
201 __fseterr(fp);
202 ASSERT_TRUE(ferror(fp));
203 clearerr(fp);
204 ASSERT_FALSE(ferror(fp));
205
206 fclose(fp);
207 #endif
208 }
209
TEST(stdio_ext,__fsetlocking)210 TEST(stdio_ext, __fsetlocking) {
211 FILE* fp = fopen("/proc/version", "r");
212 ASSERT_EQ(FSETLOCKING_INTERNAL, __fsetlocking(fp, FSETLOCKING_QUERY));
213 ASSERT_EQ(FSETLOCKING_INTERNAL, __fsetlocking(fp, FSETLOCKING_BYCALLER));
214 ASSERT_EQ(FSETLOCKING_BYCALLER, __fsetlocking(fp, FSETLOCKING_QUERY));
215 ASSERT_EQ(FSETLOCKING_BYCALLER, __fsetlocking(fp, FSETLOCKING_INTERNAL));
216 ASSERT_EQ(FSETLOCKING_INTERNAL, __fsetlocking(fp, FSETLOCKING_QUERY));
217 fclose(fp);
218 }
219
LockingByCallerHelper(std::atomic<pid_t> * pid)220 static void LockingByCallerHelper(std::atomic<pid_t>* pid) {
221 *pid = gettid();
222 flockfile(stdout);
223 funlockfile(stdout);
224 }
225
TEST(stdio_ext,__fsetlocking_BYCALLER)226 TEST(stdio_ext, __fsetlocking_BYCALLER) {
227 // Check if users can use flockfile/funlockfile to protect stdio operations.
228 int old_state = __fsetlocking(stdout, FSETLOCKING_BYCALLER);
229 flockfile(stdout);
230 pthread_t thread;
231 std::atomic<pid_t> pid(0);
232 ASSERT_EQ(0, pthread_create(&thread, nullptr,
233 reinterpret_cast<void* (*)(void*)>(LockingByCallerHelper), &pid));
234 WaitUntilThreadSleep(pid);
235 funlockfile(stdout);
236
237 ASSERT_EQ(0, pthread_join(thread, nullptr));
238 __fsetlocking(stdout, old_state);
239 }
240