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 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 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 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 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 } 102 103 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 } 118 119 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 } 148 149 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 } 193 194 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 } 209 210 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 } 219 220 static void LockingByCallerHelper(std::atomic<pid_t>* pid) { 221 *pid = gettid(); 222 flockfile(stdout); 223 funlockfile(stdout); 224 } 225 226 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
