1 /* 2 * Copyright (C) 2011 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 #define LOG_TAG "Posix" 18 19 #include "AsynchronousSocketCloseMonitor.h" 20 #include "JNIHelp.h" 21 #include "JniConstants.h" 22 #include "JniException.h" 23 #include "NetworkUtilities.h" 24 #include "ScopedBytes.h" 25 #include "ScopedLocalRef.h" 26 #include "ScopedPrimitiveArray.h" 27 #include "ScopedUtfChars.h" 28 #include "StaticAssert.h" 29 #include "UniquePtr.h" 30 #include "toStringArray.h" 31 32 #include <arpa/inet.h> 33 #include <errno.h> 34 #include <fcntl.h> 35 #include <net/if.h> 36 #include <netdb.h> 37 #include <netinet/in.h> 38 #include <netinet/in.h> 39 #include <poll.h> 40 #include <pwd.h> 41 #include <signal.h> 42 #include <stdlib.h> 43 #include <sys/ioctl.h> 44 #include <sys/mman.h> 45 #include <sys/sendfile.h> 46 #include <sys/socket.h> 47 #include <sys/socket.h> 48 #include <sys/stat.h> 49 #include <sys/time.h> 50 #include <sys/types.h> 51 #include <sys/uio.h> 52 #include <sys/utsname.h> 53 #include <sys/vfs.h> // Bionic doesn't have <sys/statvfs.h> 54 #include <sys/wait.h> 55 #include <unistd.h> 56 57 #define TO_JAVA_STRING(NAME, EXP) \ 58 jstring NAME = env->NewStringUTF(EXP); \ 59 if (NAME == NULL) return NULL; 60 61 struct addrinfo_deleter { 62 void operator()(addrinfo* p) const { 63 if (p != NULL) { // bionic's freeaddrinfo(3) crashes when passed NULL. 64 freeaddrinfo(p); 65 } 66 } 67 }; 68 69 /** 70 * Used to retry syscalls that can return EINTR. This differs from TEMP_FAILURE_RETRY in that 71 * it also considers the case where the reason for failure is that another thread called 72 * Socket.close. 73 * 74 * Assumes 'JNIEnv* env' and 'jobject javaFd' (which is a java.io.FileDescriptor) are in scope. 75 * 76 * Returns the result of 'exp', though a Java exception will be pending if the result is -1. 77 * 78 * Correct usage looks like this: 79 * 80 * void Posix_syscall(JNIEnv* env, jobject javaFd, ...) { 81 * ... 82 * int fd; 83 * NET_FAILURE_RETRY("syscall", syscall(fd, ...)); // Throws on error. 84 * } 85 */ 86 #define NET_FAILURE_RETRY(syscall_name, exp) ({ \ 87 typeof (exp) _rc = -1; \ 88 do { \ 89 { \ 90 fd = jniGetFDFromFileDescriptor(env, javaFd); \ 91 AsynchronousSocketCloseMonitor monitor(fd); \ 92 _rc = (exp); \ 93 } \ 94 if (_rc == -1) { \ 95 if (jniGetFDFromFileDescriptor(env, javaFd) == -1) { \ 96 jniThrowException(env, "java/net/SocketException", "Socket closed"); \ 97 break; \ 98 } else if (errno != EINTR) { \ 99 throwErrnoException(env, syscall_name); \ 100 break; \ 101 } \ 102 } \ 103 } while (_rc == -1); \ 104 _rc; }) 105 106 static void throwException(JNIEnv* env, jclass exceptionClass, jmethodID ctor3, jmethodID ctor2, 107 const char* functionName, int error) { 108 jthrowable cause = NULL; 109 if (env->ExceptionCheck()) { 110 cause = env->ExceptionOccurred(); 111 env->ExceptionClear(); 112 } 113 114 ScopedLocalRef<jstring> detailMessage(env, env->NewStringUTF(functionName)); 115 if (detailMessage.get() == NULL) { 116 // Not really much we can do here. We're probably dead in the water, 117 // but let's try to stumble on... 118 env->ExceptionClear(); 119 } 120 121 jobject exception; 122 if (cause != NULL) { 123 exception = env->NewObject(exceptionClass, ctor3, detailMessage.get(), error, cause); 124 } else { 125 exception = env->NewObject(exceptionClass, ctor2, detailMessage.get(), error); 126 } 127 env->Throw(reinterpret_cast<jthrowable>(exception)); 128 } 129 130 static void throwErrnoException(JNIEnv* env, const char* functionName) { 131 int error = errno; 132 static jmethodID ctor3 = env->GetMethodID(JniConstants::errnoExceptionClass, 133 "<init>", "(Ljava/lang/String;ILjava/lang/Throwable;)V"); 134 static jmethodID ctor2 = env->GetMethodID(JniConstants::errnoExceptionClass, 135 "<init>", "(Ljava/lang/String;I)V"); 136 throwException(env, JniConstants::errnoExceptionClass, ctor3, ctor2, functionName, error); 137 } 138 139 static void throwGaiException(JNIEnv* env, const char* functionName, int error) { 140 if (errno != 0) { 141 // EAI_SYSTEM should mean "look at errno instead", but both glibc and bionic seem to 142 // mess this up. In particular, if you don't have INTERNET permission, errno will be EACCES 143 // but you'll get EAI_NONAME or EAI_NODATA. So we want our GaiException to have a 144 // potentially-relevant ErrnoException as its cause even if error != EAI_SYSTEM. 145 // http://code.google.com/p/android/issues/detail?id=15722 146 throwErrnoException(env, functionName); 147 // Deliberately fall through to throw another exception... 148 } 149 static jmethodID ctor3 = env->GetMethodID(JniConstants::gaiExceptionClass, 150 "<init>", "(Ljava/lang/String;ILjava/lang/Throwable;)V"); 151 static jmethodID ctor2 = env->GetMethodID(JniConstants::gaiExceptionClass, 152 "<init>", "(Ljava/lang/String;I)V"); 153 throwException(env, JniConstants::gaiExceptionClass, ctor3, ctor2, functionName, error); 154 } 155 156 template <typename rc_t> 157 static rc_t throwIfMinusOne(JNIEnv* env, const char* name, rc_t rc) { 158 if (rc == rc_t(-1)) { 159 throwErrnoException(env, name); 160 } 161 return rc; 162 } 163 164 template <typename ScopedT> 165 class IoVec { 166 public: 167 IoVec(JNIEnv* env, size_t bufferCount) : mEnv(env), mBufferCount(bufferCount) { 168 } 169 170 bool init(jobjectArray javaBuffers, jintArray javaOffsets, jintArray javaByteCounts) { 171 // We can't delete our local references until after the I/O, so make sure we have room. 172 if (mEnv->PushLocalFrame(mBufferCount + 16) < 0) { 173 return false; 174 } 175 ScopedIntArrayRO offsets(mEnv, javaOffsets); 176 if (offsets.get() == NULL) { 177 return false; 178 } 179 ScopedIntArrayRO byteCounts(mEnv, javaByteCounts); 180 if (byteCounts.get() == NULL) { 181 return false; 182 } 183 // TODO: Linux actually has a 1024 buffer limit. glibc works around this, and we should too. 184 // TODO: you can query the limit at runtime with sysconf(_SC_IOV_MAX). 185 for (size_t i = 0; i < mBufferCount; ++i) { 186 jobject buffer = mEnv->GetObjectArrayElement(javaBuffers, i); // We keep this local ref. 187 mScopedBuffers.push_back(new ScopedT(mEnv, buffer)); 188 jbyte* ptr = const_cast<jbyte*>(mScopedBuffers.back()->get()); 189 if (ptr == NULL) { 190 return false; 191 } 192 struct iovec iov; 193 iov.iov_base = reinterpret_cast<void*>(ptr + offsets[i]); 194 iov.iov_len = byteCounts[i]; 195 mIoVec.push_back(iov); 196 } 197 return true; 198 } 199 200 ~IoVec() { 201 for (size_t i = 0; i < mScopedBuffers.size(); ++i) { 202 delete mScopedBuffers[i]; 203 } 204 mEnv->PopLocalFrame(NULL); 205 } 206 207 iovec* get() { 208 return &mIoVec[0]; 209 } 210 211 size_t size() { 212 return mBufferCount; 213 } 214 215 private: 216 JNIEnv* mEnv; 217 size_t mBufferCount; 218 std::vector<iovec> mIoVec; 219 std::vector<ScopedT*> mScopedBuffers; 220 }; 221 222 static jobject makeSocketAddress(JNIEnv* env, const sockaddr_storage* ss) { 223 // TODO: support AF_UNIX and AF_UNSPEC (and other families?) 224 jint port; 225 jobject inetAddress = sockaddrToInetAddress(env, ss, &port); 226 if (inetAddress == NULL) { 227 return NULL; 228 } 229 static jmethodID ctor = env->GetMethodID(JniConstants::inetSocketAddressClass, "<init>", 230 "(Ljava/net/InetAddress;I)V"); 231 return env->NewObject(JniConstants::inetSocketAddressClass, ctor, inetAddress, port); 232 } 233 234 static jobject makeStructPasswd(JNIEnv* env, const struct passwd& pw) { 235 TO_JAVA_STRING(pw_name, pw.pw_name); 236 TO_JAVA_STRING(pw_dir, pw.pw_dir); 237 TO_JAVA_STRING(pw_shell, pw.pw_shell); 238 static jmethodID ctor = env->GetMethodID(JniConstants::structPasswdClass, "<init>", 239 "(Ljava/lang/String;IILjava/lang/String;Ljava/lang/String;)V"); 240 return env->NewObject(JniConstants::structPasswdClass, ctor, 241 pw_name, static_cast<jint>(pw.pw_uid), static_cast<jint>(pw.pw_gid), pw_dir, pw_shell); 242 } 243 244 static jobject makeStructStat(JNIEnv* env, const struct stat& sb) { 245 static jmethodID ctor = env->GetMethodID(JniConstants::structStatClass, "<init>", 246 "(JJIJIIJJJJJJJ)V"); 247 return env->NewObject(JniConstants::structStatClass, ctor, 248 static_cast<jlong>(sb.st_dev), static_cast<jlong>(sb.st_ino), 249 static_cast<jint>(sb.st_mode), static_cast<jlong>(sb.st_nlink), 250 static_cast<jint>(sb.st_uid), static_cast<jint>(sb.st_gid), 251 static_cast<jlong>(sb.st_rdev), static_cast<jlong>(sb.st_size), 252 static_cast<jlong>(sb.st_atime), static_cast<jlong>(sb.st_mtime), 253 static_cast<jlong>(sb.st_ctime), static_cast<jlong>(sb.st_blksize), 254 static_cast<jlong>(sb.st_blocks)); 255 } 256 257 static jobject makeStructStatFs(JNIEnv* env, const struct statfs& sb) { 258 STATIC_ASSERT(sizeof(sb.f_bavail) == sizeof(jlong), statfs_not_64_bit); 259 STATIC_ASSERT(sizeof(sb.f_bfree) == sizeof(jlong), statfs_not_64_bit); 260 STATIC_ASSERT(sizeof(sb.f_blocks) == sizeof(jlong), statfs_not_64_bit); 261 262 static jmethodID ctor = env->GetMethodID(JniConstants::structStatFsClass, "<init>", 263 "(JJJJJJJJ)V"); 264 return env->NewObject(JniConstants::structStatFsClass, ctor, static_cast<jlong>(sb.f_bsize), 265 static_cast<jlong>(sb.f_blocks), static_cast<jlong>(sb.f_bfree), 266 static_cast<jlong>(sb.f_bavail), static_cast<jlong>(sb.f_files), 267 static_cast<jlong>(sb.f_ffree), static_cast<jlong>(sb.f_namelen), 268 static_cast<jlong>(sb.f_frsize)); 269 } 270 271 static jobject makeStructLinger(JNIEnv* env, const struct linger& l) { 272 static jmethodID ctor = env->GetMethodID(JniConstants::structLingerClass, "<init>", "(II)V"); 273 return env->NewObject(JniConstants::structLingerClass, ctor, l.l_onoff, l.l_linger); 274 } 275 276 static jobject makeStructTimeval(JNIEnv* env, const struct timeval& tv) { 277 static jmethodID ctor = env->GetMethodID(JniConstants::structTimevalClass, "<init>", "(JJ)V"); 278 return env->NewObject(JniConstants::structTimevalClass, ctor, 279 static_cast<jlong>(tv.tv_sec), static_cast<jlong>(tv.tv_usec)); 280 } 281 282 static jobject makeStructUtsname(JNIEnv* env, const struct utsname& buf) { 283 TO_JAVA_STRING(sysname, buf.sysname); 284 TO_JAVA_STRING(nodename, buf.nodename); 285 TO_JAVA_STRING(release, buf.release); 286 TO_JAVA_STRING(version, buf.version); 287 TO_JAVA_STRING(machine, buf.machine); 288 static jmethodID ctor = env->GetMethodID(JniConstants::structUtsnameClass, "<init>", 289 "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V"); 290 return env->NewObject(JniConstants::structUtsnameClass, ctor, 291 sysname, nodename, release, version, machine); 292 }; 293 294 static bool fillIfreq(JNIEnv* env, jstring javaInterfaceName, struct ifreq& req) { 295 ScopedUtfChars interfaceName(env, javaInterfaceName); 296 if (interfaceName.c_str() == NULL) { 297 return false; 298 } 299 memset(&req, 0, sizeof(req)); 300 strncpy(req.ifr_name, interfaceName.c_str(), sizeof(req.ifr_name)); 301 req.ifr_name[sizeof(req.ifr_name) - 1] = '\0'; 302 return true; 303 } 304 305 static bool fillInetSocketAddress(JNIEnv* env, jint rc, jobject javaInetSocketAddress, const sockaddr_storage* ss) { 306 if (rc == -1 || javaInetSocketAddress == NULL) { 307 return true; 308 } 309 // Fill out the passed-in InetSocketAddress with the sender's IP address and port number. 310 jint port; 311 jobject sender = sockaddrToInetAddress(env, ss, &port); 312 if (sender == NULL) { 313 return false; 314 } 315 static jfieldID addressFid = env->GetFieldID(JniConstants::inetSocketAddressClass, "addr", "Ljava/net/InetAddress;"); 316 static jfieldID portFid = env->GetFieldID(JniConstants::inetSocketAddressClass, "port", "I"); 317 env->SetObjectField(javaInetSocketAddress, addressFid, sender); 318 env->SetIntField(javaInetSocketAddress, portFid, port); 319 return true; 320 } 321 322 static jobject doStat(JNIEnv* env, jstring javaPath, bool isLstat) { 323 ScopedUtfChars path(env, javaPath); 324 if (path.c_str() == NULL) { 325 return NULL; 326 } 327 struct stat sb; 328 int rc = isLstat ? TEMP_FAILURE_RETRY(lstat(path.c_str(), &sb)) 329 : TEMP_FAILURE_RETRY(stat(path.c_str(), &sb)); 330 if (rc == -1) { 331 throwErrnoException(env, isLstat ? "lstat" : "stat"); 332 return NULL; 333 } 334 return makeStructStat(env, sb); 335 } 336 337 class Passwd { 338 public: 339 Passwd(JNIEnv* env) : mEnv(env), mResult(NULL) { 340 mBufferSize = sysconf(_SC_GETPW_R_SIZE_MAX); 341 if (mBufferSize == -1UL) { 342 // We're probably on bionic, where 1KiB should be enough for anyone. 343 // TODO: fix bionic to return 1024 like glibc. 344 mBufferSize = 1024; 345 } 346 mBuffer.reset(new char[mBufferSize]); 347 } 348 349 jobject getpwnam(const char* name) { 350 return process("getpwnam_r", getpwnam_r(name, &mPwd, mBuffer.get(), mBufferSize, &mResult)); 351 } 352 353 jobject getpwuid(uid_t uid) { 354 return process("getpwuid_r", getpwuid_r(uid, &mPwd, mBuffer.get(), mBufferSize, &mResult)); 355 } 356 357 struct passwd* get() { 358 return mResult; 359 } 360 361 private: 362 jobject process(const char* syscall, int error) { 363 if (mResult == NULL) { 364 errno = error; 365 throwErrnoException(mEnv, syscall); 366 return NULL; 367 } 368 return makeStructPasswd(mEnv, *mResult); 369 } 370 371 JNIEnv* mEnv; 372 UniquePtr<char[]> mBuffer; 373 size_t mBufferSize; 374 struct passwd mPwd; 375 struct passwd* mResult; 376 }; 377 378 static jobject Posix_accept(JNIEnv* env, jobject, jobject javaFd, jobject javaInetSocketAddress) { 379 sockaddr_storage ss; 380 socklen_t sl = sizeof(ss); 381 memset(&ss, 0, sizeof(ss)); 382 int fd; 383 sockaddr* peer = (javaInetSocketAddress != NULL) ? reinterpret_cast<sockaddr*>(&ss) : NULL; 384 socklen_t* peerLength = (javaInetSocketAddress != NULL) ? &sl : 0; 385 jint clientFd = NET_FAILURE_RETRY("accept", accept(fd, peer, peerLength)); 386 if (clientFd == -1 || !fillInetSocketAddress(env, clientFd, javaInetSocketAddress, &ss)) { 387 close(clientFd); 388 return NULL; 389 } 390 return (clientFd != -1) ? jniCreateFileDescriptor(env, clientFd) : NULL; 391 } 392 393 static jboolean Posix_access(JNIEnv* env, jobject, jstring javaPath, jint mode) { 394 ScopedUtfChars path(env, javaPath); 395 if (path.c_str() == NULL) { 396 return JNI_FALSE; 397 } 398 int rc = TEMP_FAILURE_RETRY(access(path.c_str(), mode)); 399 if (rc == -1) { 400 throwErrnoException(env, "access"); 401 } 402 return (rc == 0); 403 } 404 405 static void Posix_bind(JNIEnv* env, jobject, jobject javaFd, jobject javaAddress, jint port) { 406 sockaddr_storage ss; 407 if (!inetAddressToSockaddr(env, javaAddress, port, &ss)) { 408 return; 409 } 410 int fd; 411 const sockaddr* sa = reinterpret_cast<const sockaddr*>(&ss); 412 NET_FAILURE_RETRY("bind", bind(fd, sa, sizeof(sockaddr_storage))); 413 } 414 415 static void Posix_chmod(JNIEnv* env, jobject, jstring javaPath, jint mode) { 416 ScopedUtfChars path(env, javaPath); 417 if (path.c_str() == NULL) { 418 return; 419 } 420 throwIfMinusOne(env, "chmod", TEMP_FAILURE_RETRY(chmod(path.c_str(), mode))); 421 } 422 423 static void Posix_close(JNIEnv* env, jobject, jobject javaFd) { 424 // Get the FileDescriptor's 'fd' field and clear it. 425 // We need to do this before we can throw an IOException (http://b/3222087). 426 int fd = jniGetFDFromFileDescriptor(env, javaFd); 427 jniSetFileDescriptorOfFD(env, javaFd, -1); 428 429 // Even if close(2) fails with EINTR, the fd will have been closed. 430 // Using TEMP_FAILURE_RETRY will either lead to EBADF or closing someone else's fd. 431 // http://lkml.indiana.edu/hypermail/linux/kernel/0509.1/0877.html 432 throwIfMinusOne(env, "close", close(fd)); 433 } 434 435 static void Posix_connect(JNIEnv* env, jobject, jobject javaFd, jobject javaAddress, jint port) { 436 sockaddr_storage ss; 437 if (!inetAddressToSockaddr(env, javaAddress, port, &ss)) { 438 return; 439 } 440 int fd; 441 const sockaddr* sa = reinterpret_cast<const sockaddr*>(&ss); 442 NET_FAILURE_RETRY("connect", connect(fd, sa, sizeof(sockaddr_storage))); 443 } 444 445 static jobject Posix_dup(JNIEnv* env, jobject, jobject javaOldFd) { 446 int oldFd = jniGetFDFromFileDescriptor(env, javaOldFd); 447 int newFd = throwIfMinusOne(env, "dup", TEMP_FAILURE_RETRY(dup(oldFd))); 448 return (newFd != -1) ? jniCreateFileDescriptor(env, newFd) : NULL; 449 } 450 451 static jobject Posix_dup2(JNIEnv* env, jobject, jobject javaOldFd, jint newFd) { 452 int oldFd = jniGetFDFromFileDescriptor(env, javaOldFd); 453 int fd = throwIfMinusOne(env, "dup2", TEMP_FAILURE_RETRY(dup2(oldFd, newFd))); 454 return (fd != -1) ? jniCreateFileDescriptor(env, fd) : NULL; 455 } 456 457 static jobjectArray Posix_environ(JNIEnv* env, jobject) { 458 extern char** environ; // Standard, but not in any header file. 459 return toStringArray(env, environ); 460 } 461 462 static jint Posix_fcntlVoid(JNIEnv* env, jobject, jobject javaFd, jint cmd) { 463 int fd = jniGetFDFromFileDescriptor(env, javaFd); 464 return throwIfMinusOne(env, "fcntl", TEMP_FAILURE_RETRY(fcntl(fd, cmd))); 465 } 466 467 static jint Posix_fcntlLong(JNIEnv* env, jobject, jobject javaFd, jint cmd, jlong arg) { 468 int fd = jniGetFDFromFileDescriptor(env, javaFd); 469 return throwIfMinusOne(env, "fcntl", TEMP_FAILURE_RETRY(fcntl(fd, cmd, arg))); 470 } 471 472 static jint Posix_fcntlFlock(JNIEnv* env, jobject, jobject javaFd, jint cmd, jobject javaFlock) { 473 static jfieldID typeFid = env->GetFieldID(JniConstants::structFlockClass, "l_type", "S"); 474 static jfieldID whenceFid = env->GetFieldID(JniConstants::structFlockClass, "l_whence", "S"); 475 static jfieldID startFid = env->GetFieldID(JniConstants::structFlockClass, "l_start", "J"); 476 static jfieldID lenFid = env->GetFieldID(JniConstants::structFlockClass, "l_len", "J"); 477 static jfieldID pidFid = env->GetFieldID(JniConstants::structFlockClass, "l_pid", "I"); 478 479 struct flock64 lock; 480 memset(&lock, 0, sizeof(lock)); 481 lock.l_type = env->GetShortField(javaFlock, typeFid); 482 lock.l_whence = env->GetShortField(javaFlock, whenceFid); 483 lock.l_start = env->GetLongField(javaFlock, startFid); 484 lock.l_len = env->GetLongField(javaFlock, lenFid); 485 lock.l_pid = env->GetIntField(javaFlock, pidFid); 486 487 int fd = jniGetFDFromFileDescriptor(env, javaFd); 488 int rc = throwIfMinusOne(env, "fcntl", TEMP_FAILURE_RETRY(fcntl(fd, cmd, &lock))); 489 if (rc != -1) { 490 env->SetShortField(javaFlock, typeFid, lock.l_type); 491 env->SetShortField(javaFlock, whenceFid, lock.l_whence); 492 env->SetLongField(javaFlock, startFid, lock.l_start); 493 env->SetLongField(javaFlock, lenFid, lock.l_len); 494 env->SetIntField(javaFlock, pidFid, lock.l_pid); 495 } 496 return rc; 497 } 498 499 static void Posix_fdatasync(JNIEnv* env, jobject, jobject javaFd) { 500 int fd = jniGetFDFromFileDescriptor(env, javaFd); 501 throwIfMinusOne(env, "fdatasync", TEMP_FAILURE_RETRY(fdatasync(fd))); 502 } 503 504 static jobject Posix_fstat(JNIEnv* env, jobject, jobject javaFd) { 505 int fd = jniGetFDFromFileDescriptor(env, javaFd); 506 struct stat sb; 507 int rc = TEMP_FAILURE_RETRY(fstat(fd, &sb)); 508 if (rc == -1) { 509 throwErrnoException(env, "fstat"); 510 return NULL; 511 } 512 return makeStructStat(env, sb); 513 } 514 515 static jobject Posix_fstatfs(JNIEnv* env, jobject, jobject javaFd) { 516 int fd = jniGetFDFromFileDescriptor(env, javaFd); 517 struct statfs sb; 518 int rc = TEMP_FAILURE_RETRY(fstatfs(fd, &sb)); 519 if (rc == -1) { 520 throwErrnoException(env, "fstatfs"); 521 return NULL; 522 } 523 return makeStructStatFs(env, sb); 524 } 525 526 static void Posix_fsync(JNIEnv* env, jobject, jobject javaFd) { 527 int fd = jniGetFDFromFileDescriptor(env, javaFd); 528 throwIfMinusOne(env, "fsync", TEMP_FAILURE_RETRY(fsync(fd))); 529 } 530 531 static void Posix_ftruncate(JNIEnv* env, jobject, jobject javaFd, jlong length) { 532 int fd = jniGetFDFromFileDescriptor(env, javaFd); 533 throwIfMinusOne(env, "ftruncate", TEMP_FAILURE_RETRY(ftruncate64(fd, length))); 534 } 535 536 static jstring Posix_gai_strerror(JNIEnv* env, jobject, jint error) { 537 return env->NewStringUTF(gai_strerror(error)); 538 } 539 540 static jobjectArray Posix_getaddrinfo(JNIEnv* env, jobject, jstring javaNode, jobject javaHints) { 541 ScopedUtfChars node(env, javaNode); 542 if (node.c_str() == NULL) { 543 return NULL; 544 } 545 546 static jfieldID flagsFid = env->GetFieldID(JniConstants::structAddrinfoClass, "ai_flags", "I"); 547 static jfieldID familyFid = env->GetFieldID(JniConstants::structAddrinfoClass, "ai_family", "I"); 548 static jfieldID socktypeFid = env->GetFieldID(JniConstants::structAddrinfoClass, "ai_socktype", "I"); 549 static jfieldID protocolFid = env->GetFieldID(JniConstants::structAddrinfoClass, "ai_protocol", "I"); 550 551 addrinfo hints; 552 memset(&hints, 0, sizeof(hints)); 553 hints.ai_flags = env->GetIntField(javaHints, flagsFid); 554 hints.ai_family = env->GetIntField(javaHints, familyFid); 555 hints.ai_socktype = env->GetIntField(javaHints, socktypeFid); 556 hints.ai_protocol = env->GetIntField(javaHints, protocolFid); 557 558 addrinfo* addressList = NULL; 559 errno = 0; 560 int rc = getaddrinfo(node.c_str(), NULL, &hints, &addressList); 561 UniquePtr<addrinfo, addrinfo_deleter> addressListDeleter(addressList); 562 if (rc != 0) { 563 throwGaiException(env, "getaddrinfo", rc); 564 return NULL; 565 } 566 567 // Count results so we know how to size the output array. 568 int addressCount = 0; 569 for (addrinfo* ai = addressList; ai != NULL; ai = ai->ai_next) { 570 if (ai->ai_family == AF_INET || ai->ai_family == AF_INET6) { 571 ++addressCount; 572 } else { 573 ALOGE("getaddrinfo unexpected ai_family %i", ai->ai_family); 574 } 575 } 576 if (addressCount == 0) { 577 return NULL; 578 } 579 580 // Prepare output array. 581 jobjectArray result = env->NewObjectArray(addressCount, JniConstants::inetAddressClass, NULL); 582 if (result == NULL) { 583 return NULL; 584 } 585 586 // Examine returned addresses one by one, save them in the output array. 587 int index = 0; 588 for (addrinfo* ai = addressList; ai != NULL; ai = ai->ai_next) { 589 if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) { 590 // Unknown address family. Skip this address. 591 ALOGE("getaddrinfo unexpected ai_family %i", ai->ai_family); 592 continue; 593 } 594 595 // Convert each IP address into a Java byte array. 596 sockaddr_storage* address = reinterpret_cast<sockaddr_storage*>(ai->ai_addr); 597 ScopedLocalRef<jobject> inetAddress(env, sockaddrToInetAddress(env, address, NULL)); 598 if (inetAddress.get() == NULL) { 599 return NULL; 600 } 601 env->SetObjectArrayElement(result, index, inetAddress.get()); 602 ++index; 603 } 604 return result; 605 } 606 607 static jint Posix_getegid(JNIEnv*, jobject) { 608 return getegid(); 609 } 610 611 static jint Posix_geteuid(JNIEnv*, jobject) { 612 return geteuid(); 613 } 614 615 static jint Posix_getgid(JNIEnv*, jobject) { 616 return getgid(); 617 } 618 619 static jstring Posix_getenv(JNIEnv* env, jobject, jstring javaName) { 620 ScopedUtfChars name(env, javaName); 621 if (name.c_str() == NULL) { 622 return NULL; 623 } 624 return env->NewStringUTF(getenv(name.c_str())); 625 } 626 627 static jstring Posix_getnameinfo(JNIEnv* env, jobject, jobject javaAddress, jint flags) { 628 sockaddr_storage ss; 629 if (!inetAddressToSockaddrVerbatim(env, javaAddress, 0, &ss)) { 630 return NULL; 631 } 632 // TODO: bionic's getnameinfo(3) seems to want its length parameter to be exactly 633 // sizeof(sockaddr_in) for an IPv4 address and sizeof (sockaddr_in6) for an 634 // IPv6 address. Fix getnameinfo so it accepts sizeof(sockaddr_storage), and 635 // then remove this hack. 636 socklen_t size = (ss.ss_family == AF_INET) ? sizeof(sockaddr_in) : sizeof(sockaddr_in6); 637 char buf[NI_MAXHOST]; // NI_MAXHOST is longer than INET6_ADDRSTRLEN. 638 errno = 0; 639 int rc = getnameinfo(reinterpret_cast<sockaddr*>(&ss), size, buf, sizeof(buf), NULL, 0, flags); 640 if (rc != 0) { 641 throwGaiException(env, "getnameinfo", rc); 642 return NULL; 643 } 644 return env->NewStringUTF(buf); 645 } 646 647 static jint Posix_getpid(JNIEnv*, jobject) { 648 return getpid(); 649 } 650 651 static jint Posix_getppid(JNIEnv*, jobject) { 652 return getppid(); 653 } 654 655 static jobject Posix_getpwnam(JNIEnv* env, jobject, jstring javaName) { 656 ScopedUtfChars name(env, javaName); 657 if (name.c_str() == NULL) { 658 return NULL; 659 } 660 return Passwd(env).getpwnam(name.c_str()); 661 } 662 663 static jobject Posix_getpwuid(JNIEnv* env, jobject, jint uid) { 664 return Passwd(env).getpwuid(uid); 665 } 666 667 static jobject Posix_getsockname(JNIEnv* env, jobject, jobject javaFd) { 668 int fd = jniGetFDFromFileDescriptor(env, javaFd); 669 sockaddr_storage ss; 670 sockaddr* sa = reinterpret_cast<sockaddr*>(&ss); 671 socklen_t byteCount = sizeof(ss); 672 memset(&ss, 0, byteCount); 673 int rc = TEMP_FAILURE_RETRY(getsockname(fd, sa, &byteCount)); 674 if (rc == -1) { 675 throwErrnoException(env, "getsockname"); 676 return NULL; 677 } 678 return makeSocketAddress(env, &ss); 679 } 680 681 static jint Posix_getsockoptByte(JNIEnv* env, jobject, jobject javaFd, jint level, jint option) { 682 int fd = jniGetFDFromFileDescriptor(env, javaFd); 683 u_char result = 0; 684 socklen_t size = sizeof(result); 685 throwIfMinusOne(env, "getsockopt", TEMP_FAILURE_RETRY(getsockopt(fd, level, option, &result, &size))); 686 return result; 687 } 688 689 static jobject Posix_getsockoptInAddr(JNIEnv* env, jobject, jobject javaFd, jint level, jint option) { 690 int fd = jniGetFDFromFileDescriptor(env, javaFd); 691 sockaddr_storage ss; 692 memset(&ss, 0, sizeof(ss)); 693 ss.ss_family = AF_INET; // This is only for the IPv4-only IP_MULTICAST_IF. 694 sockaddr_in* sa = reinterpret_cast<sockaddr_in*>(&ss); 695 socklen_t size = sizeof(sa->sin_addr); 696 int rc = TEMP_FAILURE_RETRY(getsockopt(fd, level, option, &sa->sin_addr, &size)); 697 if (rc == -1) { 698 throwErrnoException(env, "getsockopt"); 699 return NULL; 700 } 701 return sockaddrToInetAddress(env, &ss, NULL); 702 } 703 704 static jint Posix_getsockoptInt(JNIEnv* env, jobject, jobject javaFd, jint level, jint option) { 705 int fd = jniGetFDFromFileDescriptor(env, javaFd); 706 jint result = 0; 707 socklen_t size = sizeof(result); 708 throwIfMinusOne(env, "getsockopt", TEMP_FAILURE_RETRY(getsockopt(fd, level, option, &result, &size))); 709 return result; 710 } 711 712 static jobject Posix_getsockoptLinger(JNIEnv* env, jobject, jobject javaFd, jint level, jint option) { 713 int fd = jniGetFDFromFileDescriptor(env, javaFd); 714 struct linger l; 715 socklen_t size = sizeof(l); 716 memset(&l, 0, size); 717 int rc = TEMP_FAILURE_RETRY(getsockopt(fd, level, option, &l, &size)); 718 if (rc == -1) { 719 throwErrnoException(env, "getsockopt"); 720 return NULL; 721 } 722 return makeStructLinger(env, l); 723 } 724 725 static jobject Posix_getsockoptTimeval(JNIEnv* env, jobject, jobject javaFd, jint level, jint option) { 726 int fd = jniGetFDFromFileDescriptor(env, javaFd); 727 struct timeval tv; 728 socklen_t size = sizeof(tv); 729 memset(&tv, 0, size); 730 int rc = TEMP_FAILURE_RETRY(getsockopt(fd, level, option, &tv, &size)); 731 if (rc == -1) { 732 throwErrnoException(env, "getsockopt"); 733 return NULL; 734 } 735 return makeStructTimeval(env, tv); 736 } 737 738 static jint Posix_getuid(JNIEnv*, jobject) { 739 return getuid(); 740 } 741 742 static jstring Posix_if_indextoname(JNIEnv* env, jobject, jint index) { 743 char buf[IF_NAMESIZE]; 744 char* name = if_indextoname(index, buf); 745 // if_indextoname(3) returns NULL on failure, which will come out of NewStringUTF unscathed. 746 // There's no useful information in errno, so we don't bother throwing. Callers can null-check. 747 return env->NewStringUTF(name); 748 } 749 750 static jobject Posix_inet_pton(JNIEnv* env, jobject, jint family, jstring javaName) { 751 ScopedUtfChars name(env, javaName); 752 if (name.c_str() == NULL) { 753 return NULL; 754 } 755 sockaddr_storage ss; 756 memset(&ss, 0, sizeof(ss)); 757 // sockaddr_in and sockaddr_in6 are at the same address, so we can use either here. 758 void* dst = &reinterpret_cast<sockaddr_in*>(&ss)->sin_addr; 759 if (inet_pton(family, name.c_str(), dst) != 1) { 760 return NULL; 761 } 762 ss.ss_family = family; 763 return sockaddrToInetAddress(env, &ss, NULL); 764 } 765 766 static jobject Posix_ioctlInetAddress(JNIEnv* env, jobject, jobject javaFd, jint cmd, jstring javaInterfaceName) { 767 struct ifreq req; 768 if (!fillIfreq(env, javaInterfaceName, req)) { 769 return NULL; 770 } 771 int fd = jniGetFDFromFileDescriptor(env, javaFd); 772 int rc = throwIfMinusOne(env, "ioctl", TEMP_FAILURE_RETRY(ioctl(fd, cmd, &req))); 773 if (rc == -1) { 774 return NULL; 775 } 776 return sockaddrToInetAddress(env, reinterpret_cast<sockaddr_storage*>(&req.ifr_addr), NULL); 777 } 778 779 static jint Posix_ioctlInt(JNIEnv* env, jobject, jobject javaFd, jint cmd, jobject javaArg) { 780 // This is complicated because ioctls may return their result by updating their argument 781 // or via their return value, so we need to support both. 782 int fd = jniGetFDFromFileDescriptor(env, javaFd); 783 static jfieldID valueFid = env->GetFieldID(JniConstants::mutableIntClass, "value", "I"); 784 jint arg = env->GetIntField(javaArg, valueFid); 785 int rc = throwIfMinusOne(env, "ioctl", TEMP_FAILURE_RETRY(ioctl(fd, cmd, &arg))); 786 if (!env->ExceptionCheck()) { 787 env->SetIntField(javaArg, valueFid, arg); 788 } 789 return rc; 790 } 791 792 static jboolean Posix_isatty(JNIEnv* env, jobject, jobject javaFd) { 793 int fd = jniGetFDFromFileDescriptor(env, javaFd); 794 return TEMP_FAILURE_RETRY(isatty(fd)) == 0; 795 } 796 797 static void Posix_kill(JNIEnv* env, jobject, jint pid, jint sig) { 798 throwIfMinusOne(env, "kill", TEMP_FAILURE_RETRY(kill(pid, sig))); 799 } 800 801 static void Posix_listen(JNIEnv* env, jobject, jobject javaFd, jint backlog) { 802 int fd = jniGetFDFromFileDescriptor(env, javaFd); 803 throwIfMinusOne(env, "listen", TEMP_FAILURE_RETRY(listen(fd, backlog))); 804 } 805 806 static jlong Posix_lseek(JNIEnv* env, jobject, jobject javaFd, jlong offset, jint whence) { 807 int fd = jniGetFDFromFileDescriptor(env, javaFd); 808 return throwIfMinusOne(env, "lseek", TEMP_FAILURE_RETRY(lseek64(fd, offset, whence))); 809 } 810 811 static jobject Posix_lstat(JNIEnv* env, jobject, jstring javaPath) { 812 return doStat(env, javaPath, true); 813 } 814 815 static void Posix_mincore(JNIEnv* env, jobject, jlong address, jlong byteCount, jbyteArray javaVector) { 816 ScopedByteArrayRW vector(env, javaVector); 817 if (vector.get() == NULL) { 818 return; 819 } 820 void* ptr = reinterpret_cast<void*>(static_cast<uintptr_t>(address)); 821 unsigned char* vec = reinterpret_cast<unsigned char*>(vector.get()); 822 throwIfMinusOne(env, "mincore", TEMP_FAILURE_RETRY(mincore(ptr, byteCount, vec))); 823 } 824 825 static void Posix_mkdir(JNIEnv* env, jobject, jstring javaPath, jint mode) { 826 ScopedUtfChars path(env, javaPath); 827 if (path.c_str() == NULL) { 828 return; 829 } 830 throwIfMinusOne(env, "mkdir", TEMP_FAILURE_RETRY(mkdir(path.c_str(), mode))); 831 } 832 833 static void Posix_mlock(JNIEnv* env, jobject, jlong address, jlong byteCount) { 834 void* ptr = reinterpret_cast<void*>(static_cast<uintptr_t>(address)); 835 throwIfMinusOne(env, "mlock", TEMP_FAILURE_RETRY(mlock(ptr, byteCount))); 836 } 837 838 static jlong Posix_mmap(JNIEnv* env, jobject, jlong address, jlong byteCount, jint prot, jint flags, jobject javaFd, jlong offset) { 839 int fd = jniGetFDFromFileDescriptor(env, javaFd); 840 void* suggestedPtr = reinterpret_cast<void*>(static_cast<uintptr_t>(address)); 841 void* ptr = mmap(suggestedPtr, byteCount, prot, flags, fd, offset); 842 if (ptr == MAP_FAILED) { 843 throwErrnoException(env, "mmap"); 844 } 845 return static_cast<jlong>(reinterpret_cast<uintptr_t>(ptr)); 846 } 847 848 static void Posix_msync(JNIEnv* env, jobject, jlong address, jlong byteCount, jint flags) { 849 void* ptr = reinterpret_cast<void*>(static_cast<uintptr_t>(address)); 850 throwIfMinusOne(env, "msync", TEMP_FAILURE_RETRY(msync(ptr, byteCount, flags))); 851 } 852 853 static void Posix_munlock(JNIEnv* env, jobject, jlong address, jlong byteCount) { 854 void* ptr = reinterpret_cast<void*>(static_cast<uintptr_t>(address)); 855 throwIfMinusOne(env, "munlock", TEMP_FAILURE_RETRY(munlock(ptr, byteCount))); 856 } 857 858 static void Posix_munmap(JNIEnv* env, jobject, jlong address, jlong byteCount) { 859 void* ptr = reinterpret_cast<void*>(static_cast<uintptr_t>(address)); 860 throwIfMinusOne(env, "munmap", TEMP_FAILURE_RETRY(munmap(ptr, byteCount))); 861 } 862 863 static jobject Posix_open(JNIEnv* env, jobject, jstring javaPath, jint flags, jint mode) { 864 ScopedUtfChars path(env, javaPath); 865 if (path.c_str() == NULL) { 866 return NULL; 867 } 868 int fd = throwIfMinusOne(env, "open", TEMP_FAILURE_RETRY(open(path.c_str(), flags, mode))); 869 return fd != -1 ? jniCreateFileDescriptor(env, fd) : NULL; 870 } 871 872 static jobjectArray Posix_pipe(JNIEnv* env, jobject) { 873 int fds[2]; 874 throwIfMinusOne(env, "pipe", TEMP_FAILURE_RETRY(pipe(&fds[0]))); 875 jobjectArray result = env->NewObjectArray(2, JniConstants::fileDescriptorClass, NULL); 876 if (result == NULL) { 877 return NULL; 878 } 879 for (int i = 0; i < 2; ++i) { 880 ScopedLocalRef<jobject> fd(env, jniCreateFileDescriptor(env, fds[i])); 881 if (fd.get() == NULL) { 882 return NULL; 883 } 884 env->SetObjectArrayElement(result, i, fd.get()); 885 if (env->ExceptionCheck()) { 886 return NULL; 887 } 888 } 889 return result; 890 } 891 892 static jint Posix_poll(JNIEnv* env, jobject, jobjectArray javaStructs, jint timeoutMs) { 893 static jfieldID fdFid = env->GetFieldID(JniConstants::structPollfdClass, "fd", "Ljava/io/FileDescriptor;"); 894 static jfieldID eventsFid = env->GetFieldID(JniConstants::structPollfdClass, "events", "S"); 895 static jfieldID reventsFid = env->GetFieldID(JniConstants::structPollfdClass, "revents", "S"); 896 897 // Turn the Java libcore.io.StructPollfd[] into a C++ struct pollfd[]. 898 size_t arrayLength = env->GetArrayLength(javaStructs); 899 UniquePtr<struct pollfd[]> fds(new struct pollfd[arrayLength]); 900 memset(fds.get(), 0, sizeof(struct pollfd) * arrayLength); 901 size_t count = 0; // Some trailing array elements may be irrelevant. (See below.) 902 for (size_t i = 0; i < arrayLength; ++i) { 903 ScopedLocalRef<jobject> javaStruct(env, env->GetObjectArrayElement(javaStructs, i)); 904 if (javaStruct.get() == NULL) { 905 break; // We allow trailing nulls in the array for caller convenience. 906 } 907 ScopedLocalRef<jobject> javaFd(env, env->GetObjectField(javaStruct.get(), fdFid)); 908 if (javaFd.get() == NULL) { 909 break; // We also allow callers to just clear the fd field (this is what Selector does). 910 } 911 fds[count].fd = jniGetFDFromFileDescriptor(env, javaFd.get()); 912 fds[count].events = env->GetShortField(javaStruct.get(), eventsFid); 913 ++count; 914 } 915 916 // Since we don't know which fds -- if any -- are sockets, be conservative and register 917 // all fds for asynchronous socket close monitoring. 918 std::vector<AsynchronousSocketCloseMonitor*> monitors; 919 for (size_t i = 0; i < count; ++i) { 920 monitors.push_back(new AsynchronousSocketCloseMonitor(fds[i].fd)); 921 } 922 int rc = poll(fds.get(), count, timeoutMs); 923 for (size_t i = 0; i < monitors.size(); ++i) { 924 delete monitors[i]; 925 } 926 if (rc == -1) { 927 throwErrnoException(env, "poll"); 928 return -1; 929 } 930 931 // Update the revents fields in the Java libcore.io.StructPollfd[]. 932 for (size_t i = 0; i < count; ++i) { 933 ScopedLocalRef<jobject> javaStruct(env, env->GetObjectArrayElement(javaStructs, i)); 934 if (javaStruct.get() == NULL) { 935 return -1; 936 } 937 env->SetShortField(javaStruct.get(), reventsFid, fds[i].revents); 938 } 939 return rc; 940 } 941 942 static jint Posix_preadBytes(JNIEnv* env, jobject, jobject javaFd, jobject javaBytes, jint byteOffset, jint byteCount, jlong offset) { 943 ScopedBytesRW bytes(env, javaBytes); 944 if (bytes.get() == NULL) { 945 return -1; 946 } 947 int fd = jniGetFDFromFileDescriptor(env, javaFd); 948 return throwIfMinusOne(env, "pread", TEMP_FAILURE_RETRY(pread64(fd, bytes.get() + byteOffset, byteCount, offset))); 949 } 950 951 static jint Posix_pwriteBytes(JNIEnv* env, jobject, jobject javaFd, jbyteArray javaBytes, jint byteOffset, jint byteCount, jlong offset) { 952 ScopedBytesRO bytes(env, javaBytes); 953 if (bytes.get() == NULL) { 954 return -1; 955 } 956 int fd = jniGetFDFromFileDescriptor(env, javaFd); 957 return throwIfMinusOne(env, "pwrite", TEMP_FAILURE_RETRY(pwrite64(fd, bytes.get() + byteOffset, byteCount, offset))); 958 } 959 960 static jint Posix_readBytes(JNIEnv* env, jobject, jobject javaFd, jobject javaBytes, jint byteOffset, jint byteCount) { 961 ScopedBytesRW bytes(env, javaBytes); 962 if (bytes.get() == NULL) { 963 return -1; 964 } 965 int fd = jniGetFDFromFileDescriptor(env, javaFd); 966 return throwIfMinusOne(env, "read", TEMP_FAILURE_RETRY(read(fd, bytes.get() + byteOffset, byteCount))); 967 } 968 969 static jint Posix_readv(JNIEnv* env, jobject, jobject javaFd, jobjectArray buffers, jintArray offsets, jintArray byteCounts) { 970 IoVec<ScopedBytesRW> ioVec(env, env->GetArrayLength(buffers)); 971 if (!ioVec.init(buffers, offsets, byteCounts)) { 972 return -1; 973 } 974 int fd = jniGetFDFromFileDescriptor(env, javaFd); 975 return throwIfMinusOne(env, "readv", TEMP_FAILURE_RETRY(readv(fd, ioVec.get(), ioVec.size()))); 976 } 977 978 static jint Posix_recvfromBytes(JNIEnv* env, jobject, jobject javaFd, jobject javaBytes, jint byteOffset, jint byteCount, jint flags, jobject javaInetSocketAddress) { 979 ScopedBytesRW bytes(env, javaBytes); 980 if (bytes.get() == NULL) { 981 return -1; 982 } 983 sockaddr_storage ss; 984 socklen_t sl = sizeof(ss); 985 memset(&ss, 0, sizeof(ss)); 986 int fd; 987 sockaddr* from = (javaInetSocketAddress != NULL) ? reinterpret_cast<sockaddr*>(&ss) : NULL; 988 socklen_t* fromLength = (javaInetSocketAddress != NULL) ? &sl : 0; 989 jint recvCount = NET_FAILURE_RETRY("recvfrom", recvfrom(fd, bytes.get() + byteOffset, byteCount, flags, from, fromLength)); 990 fillInetSocketAddress(env, recvCount, javaInetSocketAddress, &ss); 991 return recvCount; 992 } 993 994 static void Posix_remove(JNIEnv* env, jobject, jstring javaPath) { 995 ScopedUtfChars path(env, javaPath); 996 if (path.c_str() == NULL) { 997 return; 998 } 999 throwIfMinusOne(env, "remove", TEMP_FAILURE_RETRY(remove(path.c_str()))); 1000 } 1001 1002 static void Posix_rename(JNIEnv* env, jobject, jstring javaOldPath, jstring javaNewPath) { 1003 ScopedUtfChars oldPath(env, javaOldPath); 1004 if (oldPath.c_str() == NULL) { 1005 return; 1006 } 1007 ScopedUtfChars newPath(env, javaNewPath); 1008 if (newPath.c_str() == NULL) { 1009 return; 1010 } 1011 throwIfMinusOne(env, "rename", TEMP_FAILURE_RETRY(rename(oldPath.c_str(), newPath.c_str()))); 1012 } 1013 1014 static jlong Posix_sendfile(JNIEnv* env, jobject, jobject javaOutFd, jobject javaInFd, jobject javaOffset, jlong byteCount) { 1015 int outFd = jniGetFDFromFileDescriptor(env, javaOutFd); 1016 int inFd = jniGetFDFromFileDescriptor(env, javaInFd); 1017 static jfieldID valueFid = env->GetFieldID(JniConstants::mutableLongClass, "value", "J"); 1018 off_t offset = 0; 1019 off_t* offsetPtr = NULL; 1020 if (javaOffset != NULL) { 1021 // TODO: fix bionic so we can have a 64-bit off_t! 1022 offset = env->GetLongField(javaOffset, valueFid); 1023 offsetPtr = &offset; 1024 } 1025 jlong result = throwIfMinusOne(env, "sendfile", TEMP_FAILURE_RETRY(sendfile(outFd, inFd, offsetPtr, byteCount))); 1026 if (javaOffset != NULL) { 1027 env->SetLongField(javaOffset, valueFid, offset); 1028 } 1029 return result; 1030 } 1031 1032 static jint Posix_sendtoBytes(JNIEnv* env, jobject, jobject javaFd, jobject javaBytes, jint byteOffset, jint byteCount, jint flags, jobject javaInetAddress, jint port) { 1033 ScopedBytesRO bytes(env, javaBytes); 1034 if (bytes.get() == NULL) { 1035 return -1; 1036 } 1037 sockaddr_storage ss; 1038 if (javaInetAddress != NULL && !inetAddressToSockaddr(env, javaInetAddress, port, &ss)) { 1039 return -1; 1040 } 1041 int fd; 1042 const sockaddr* to = (javaInetAddress != NULL) ? reinterpret_cast<const sockaddr*>(&ss) : NULL; 1043 socklen_t toLength = (javaInetAddress != NULL) ? sizeof(ss) : 0; 1044 return NET_FAILURE_RETRY("sendto", sendto(fd, bytes.get() + byteOffset, byteCount, flags, to, toLength)); 1045 } 1046 1047 static void Posix_setegid(JNIEnv* env, jobject, jint egid) { 1048 throwIfMinusOne(env, "setegid", TEMP_FAILURE_RETRY(setegid(egid))); 1049 } 1050 1051 static void Posix_seteuid(JNIEnv* env, jobject, jint euid) { 1052 throwIfMinusOne(env, "seteuid", TEMP_FAILURE_RETRY(seteuid(euid))); 1053 } 1054 1055 static void Posix_setgid(JNIEnv* env, jobject, jint gid) { 1056 throwIfMinusOne(env, "setgid", TEMP_FAILURE_RETRY(setgid(gid))); 1057 } 1058 1059 static void Posix_setsockoptByte(JNIEnv* env, jobject, jobject javaFd, jint level, jint option, jint value) { 1060 int fd = jniGetFDFromFileDescriptor(env, javaFd); 1061 u_char byte = value; 1062 throwIfMinusOne(env, "setsockopt", TEMP_FAILURE_RETRY(setsockopt(fd, level, option, &byte, sizeof(byte)))); 1063 } 1064 1065 static void Posix_setsockoptIfreq(JNIEnv* env, jobject, jobject javaFd, jint level, jint option, jstring javaInterfaceName) { 1066 struct ifreq req; 1067 if (!fillIfreq(env, javaInterfaceName, req)) { 1068 return; 1069 } 1070 int fd = jniGetFDFromFileDescriptor(env, javaFd); 1071 throwIfMinusOne(env, "setsockopt", TEMP_FAILURE_RETRY(setsockopt(fd, level, option, &req, sizeof(req)))); 1072 } 1073 1074 static void Posix_setsockoptInt(JNIEnv* env, jobject, jobject javaFd, jint level, jint option, jint value) { 1075 int fd = jniGetFDFromFileDescriptor(env, javaFd); 1076 throwIfMinusOne(env, "setsockopt", TEMP_FAILURE_RETRY(setsockopt(fd, level, option, &value, sizeof(value)))); 1077 } 1078 1079 static void Posix_setsockoptIpMreqn(JNIEnv* env, jobject, jobject javaFd, jint level, jint option, jint value) { 1080 ip_mreqn req; 1081 memset(&req, 0, sizeof(req)); 1082 req.imr_ifindex = value; 1083 int fd = jniGetFDFromFileDescriptor(env, javaFd); 1084 throwIfMinusOne(env, "setsockopt", TEMP_FAILURE_RETRY(setsockopt(fd, level, option, &req, sizeof(req)))); 1085 } 1086 1087 static void Posix_setsockoptGroupReq(JNIEnv* env, jobject, jobject javaFd, jint level, jint option, jobject javaGroupReq) { 1088 struct group_req req; 1089 memset(&req, 0, sizeof(req)); 1090 1091 static jfieldID grInterfaceFid = env->GetFieldID(JniConstants::structGroupReqClass, "gr_interface", "I"); 1092 req.gr_interface = env->GetIntField(javaGroupReq, grInterfaceFid); 1093 // Get the IPv4 or IPv6 multicast address to join or leave. 1094 static jfieldID grGroupFid = env->GetFieldID(JniConstants::structGroupReqClass, "gr_group", "Ljava/net/InetAddress;"); 1095 ScopedLocalRef<jobject> javaGroup(env, env->GetObjectField(javaGroupReq, grGroupFid)); 1096 if (!inetAddressToSockaddrVerbatim(env, javaGroup.get(), 0, &req.gr_group)) { 1097 return; 1098 } 1099 1100 int fd = jniGetFDFromFileDescriptor(env, javaFd); 1101 int rc = TEMP_FAILURE_RETRY(setsockopt(fd, level, option, &req, sizeof(req))); 1102 if (rc == -1 && errno == EINVAL) { 1103 // Maybe we're a 32-bit binary talking to a 64-bit kernel? 1104 // glibc doesn't automatically handle this. 1105 struct GCC_HIDDEN group_req64 { 1106 uint32_t gr_interface; 1107 uint32_t my_padding; 1108 sockaddr_storage gr_group; 1109 }; 1110 group_req64 req64; 1111 req64.gr_interface = req.gr_interface; 1112 memcpy(&req64.gr_group, &req.gr_group, sizeof(req.gr_group)); 1113 rc = TEMP_FAILURE_RETRY(setsockopt(fd, level, option, &req64, sizeof(req64))); 1114 } 1115 throwIfMinusOne(env, "setsockopt", rc); 1116 } 1117 1118 static void Posix_setsockoptLinger(JNIEnv* env, jobject, jobject javaFd, jint level, jint option, jobject javaLinger) { 1119 static jfieldID lOnoffFid = env->GetFieldID(JniConstants::structLingerClass, "l_onoff", "I"); 1120 static jfieldID lLingerFid = env->GetFieldID(JniConstants::structLingerClass, "l_linger", "I"); 1121 int fd = jniGetFDFromFileDescriptor(env, javaFd); 1122 struct linger value; 1123 value.l_onoff = env->GetIntField(javaLinger, lOnoffFid); 1124 value.l_linger = env->GetIntField(javaLinger, lLingerFid); 1125 throwIfMinusOne(env, "setsockopt", TEMP_FAILURE_RETRY(setsockopt(fd, level, option, &value, sizeof(value)))); 1126 } 1127 1128 static void Posix_setsockoptTimeval(JNIEnv* env, jobject, jobject javaFd, jint level, jint option, jobject javaTimeval) { 1129 static jfieldID tvSecFid = env->GetFieldID(JniConstants::structTimevalClass, "tv_sec", "J"); 1130 static jfieldID tvUsecFid = env->GetFieldID(JniConstants::structTimevalClass, "tv_usec", "J"); 1131 int fd = jniGetFDFromFileDescriptor(env, javaFd); 1132 struct timeval value; 1133 value.tv_sec = env->GetLongField(javaTimeval, tvSecFid); 1134 value.tv_usec = env->GetLongField(javaTimeval, tvUsecFid); 1135 throwIfMinusOne(env, "setsockopt", TEMP_FAILURE_RETRY(setsockopt(fd, level, option, &value, sizeof(value)))); 1136 } 1137 1138 static void Posix_setuid(JNIEnv* env, jobject, jint uid) { 1139 throwIfMinusOne(env, "setuid", TEMP_FAILURE_RETRY(setuid(uid))); 1140 } 1141 1142 static void Posix_shutdown(JNIEnv* env, jobject, jobject javaFd, jint how) { 1143 int fd = jniGetFDFromFileDescriptor(env, javaFd); 1144 throwIfMinusOne(env, "shutdown", TEMP_FAILURE_RETRY(shutdown(fd, how))); 1145 } 1146 1147 static jobject Posix_socket(JNIEnv* env, jobject, jint domain, jint type, jint protocol) { 1148 int fd = throwIfMinusOne(env, "socket", TEMP_FAILURE_RETRY(socket(domain, type, protocol))); 1149 return fd != -1 ? jniCreateFileDescriptor(env, fd) : NULL; 1150 } 1151 1152 static jobject Posix_stat(JNIEnv* env, jobject, jstring javaPath) { 1153 return doStat(env, javaPath, false); 1154 } 1155 1156 static jobject Posix_statfs(JNIEnv* env, jobject, jstring javaPath) { 1157 ScopedUtfChars path(env, javaPath); 1158 if (path.c_str() == NULL) { 1159 return NULL; 1160 } 1161 struct statfs sb; 1162 int rc = TEMP_FAILURE_RETRY(statfs(path.c_str(), &sb)); 1163 if (rc == -1) { 1164 throwErrnoException(env, "statfs"); 1165 return NULL; 1166 } 1167 return makeStructStatFs(env, sb); 1168 } 1169 1170 static jstring Posix_strerror(JNIEnv* env, jobject, jint errnum) { 1171 char buffer[BUFSIZ]; 1172 const char* message = jniStrError(errnum, buffer, sizeof(buffer)); 1173 return env->NewStringUTF(message); 1174 } 1175 1176 static void Posix_symlink(JNIEnv* env, jobject, jstring javaOldPath, jstring javaNewPath) { 1177 ScopedUtfChars oldPath(env, javaOldPath); 1178 if (oldPath.c_str() == NULL) { 1179 return; 1180 } 1181 ScopedUtfChars newPath(env, javaNewPath); 1182 if (newPath.c_str() == NULL) { 1183 return; 1184 } 1185 throwIfMinusOne(env, "symlink", TEMP_FAILURE_RETRY(symlink(oldPath.c_str(), newPath.c_str()))); 1186 } 1187 1188 static jlong Posix_sysconf(JNIEnv* env, jobject, jint name) { 1189 // Since -1 is a valid result from sysconf(3), detecting failure is a little more awkward. 1190 errno = 0; 1191 long result = sysconf(name); 1192 if (result == -1L && errno == EINVAL) { 1193 throwErrnoException(env, "sysconf"); 1194 } 1195 return result; 1196 } 1197 1198 static jobject Posix_uname(JNIEnv* env, jobject) { 1199 struct utsname buf; 1200 if (TEMP_FAILURE_RETRY(uname(&buf)) == -1) { 1201 return NULL; // Can't happen. 1202 } 1203 return makeStructUtsname(env, buf); 1204 } 1205 1206 static jint Posix_waitpid(JNIEnv* env, jobject, jint pid, jobject javaStatus, jint options) { 1207 int status; 1208 int rc = throwIfMinusOne(env, "waitpid", TEMP_FAILURE_RETRY(waitpid(pid, &status, options))); 1209 if (rc != -1) { 1210 static jfieldID valueFid = env->GetFieldID(JniConstants::mutableIntClass, "value", "I"); 1211 env->SetIntField(javaStatus, valueFid, status); 1212 } 1213 return rc; 1214 } 1215 1216 static jint Posix_writeBytes(JNIEnv* env, jobject, jobject javaFd, jbyteArray javaBytes, jint byteOffset, jint byteCount) { 1217 ScopedBytesRO bytes(env, javaBytes); 1218 if (bytes.get() == NULL) { 1219 return -1; 1220 } 1221 int fd = jniGetFDFromFileDescriptor(env, javaFd); 1222 return throwIfMinusOne(env, "write", TEMP_FAILURE_RETRY(write(fd, bytes.get() + byteOffset, byteCount))); 1223 } 1224 1225 static jint Posix_writev(JNIEnv* env, jobject, jobject javaFd, jobjectArray buffers, jintArray offsets, jintArray byteCounts) { 1226 IoVec<ScopedBytesRO> ioVec(env, env->GetArrayLength(buffers)); 1227 if (!ioVec.init(buffers, offsets, byteCounts)) { 1228 return -1; 1229 } 1230 int fd = jniGetFDFromFileDescriptor(env, javaFd); 1231 return throwIfMinusOne(env, "writev", TEMP_FAILURE_RETRY(writev(fd, ioVec.get(), ioVec.size()))); 1232 } 1233 1234 static JNINativeMethod gMethods[] = { 1235 NATIVE_METHOD(Posix, accept, "(Ljava/io/FileDescriptor;Ljava/net/InetSocketAddress;)Ljava/io/FileDescriptor;"), 1236 NATIVE_METHOD(Posix, access, "(Ljava/lang/String;I)Z"), 1237 NATIVE_METHOD(Posix, bind, "(Ljava/io/FileDescriptor;Ljava/net/InetAddress;I)V"), 1238 NATIVE_METHOD(Posix, chmod, "(Ljava/lang/String;I)V"), 1239 NATIVE_METHOD(Posix, close, "(Ljava/io/FileDescriptor;)V"), 1240 NATIVE_METHOD(Posix, connect, "(Ljava/io/FileDescriptor;Ljava/net/InetAddress;I)V"), 1241 NATIVE_METHOD(Posix, dup, "(Ljava/io/FileDescriptor;)Ljava/io/FileDescriptor;"), 1242 NATIVE_METHOD(Posix, dup2, "(Ljava/io/FileDescriptor;I)Ljava/io/FileDescriptor;"), 1243 NATIVE_METHOD(Posix, environ, "()[Ljava/lang/String;"), 1244 NATIVE_METHOD(Posix, fcntlVoid, "(Ljava/io/FileDescriptor;I)I"), 1245 NATIVE_METHOD(Posix, fcntlLong, "(Ljava/io/FileDescriptor;IJ)I"), 1246 NATIVE_METHOD(Posix, fcntlFlock, "(Ljava/io/FileDescriptor;ILlibcore/io/StructFlock;)I"), 1247 NATIVE_METHOD(Posix, fdatasync, "(Ljava/io/FileDescriptor;)V"), 1248 NATIVE_METHOD(Posix, fstat, "(Ljava/io/FileDescriptor;)Llibcore/io/StructStat;"), 1249 NATIVE_METHOD(Posix, fstatfs, "(Ljava/io/FileDescriptor;)Llibcore/io/StructStatFs;"), 1250 NATIVE_METHOD(Posix, fsync, "(Ljava/io/FileDescriptor;)V"), 1251 NATIVE_METHOD(Posix, ftruncate, "(Ljava/io/FileDescriptor;J)V"), 1252 NATIVE_METHOD(Posix, gai_strerror, "(I)Ljava/lang/String;"), 1253 NATIVE_METHOD(Posix, getaddrinfo, "(Ljava/lang/String;Llibcore/io/StructAddrinfo;)[Ljava/net/InetAddress;"), 1254 NATIVE_METHOD(Posix, getegid, "()I"), 1255 NATIVE_METHOD(Posix, geteuid, "()I"), 1256 NATIVE_METHOD(Posix, getgid, "()I"), 1257 NATIVE_METHOD(Posix, getenv, "(Ljava/lang/String;)Ljava/lang/String;"), 1258 NATIVE_METHOD(Posix, getnameinfo, "(Ljava/net/InetAddress;I)Ljava/lang/String;"), 1259 NATIVE_METHOD(Posix, getpid, "()I"), 1260 NATIVE_METHOD(Posix, getppid, "()I"), 1261 NATIVE_METHOD(Posix, getpwnam, "(Ljava/lang/String;)Llibcore/io/StructPasswd;"), 1262 NATIVE_METHOD(Posix, getpwuid, "(I)Llibcore/io/StructPasswd;"), 1263 NATIVE_METHOD(Posix, getsockname, "(Ljava/io/FileDescriptor;)Ljava/net/SocketAddress;"), 1264 NATIVE_METHOD(Posix, getsockoptByte, "(Ljava/io/FileDescriptor;II)I"), 1265 NATIVE_METHOD(Posix, getsockoptInAddr, "(Ljava/io/FileDescriptor;II)Ljava/net/InetAddress;"), 1266 NATIVE_METHOD(Posix, getsockoptInt, "(Ljava/io/FileDescriptor;II)I"), 1267 NATIVE_METHOD(Posix, getsockoptLinger, "(Ljava/io/FileDescriptor;II)Llibcore/io/StructLinger;"), 1268 NATIVE_METHOD(Posix, getsockoptTimeval, "(Ljava/io/FileDescriptor;II)Llibcore/io/StructTimeval;"), 1269 NATIVE_METHOD(Posix, getuid, "()I"), 1270 NATIVE_METHOD(Posix, if_indextoname, "(I)Ljava/lang/String;"), 1271 NATIVE_METHOD(Posix, inet_pton, "(ILjava/lang/String;)Ljava/net/InetAddress;"), 1272 NATIVE_METHOD(Posix, ioctlInetAddress, "(Ljava/io/FileDescriptor;ILjava/lang/String;)Ljava/net/InetAddress;"), 1273 NATIVE_METHOD(Posix, ioctlInt, "(Ljava/io/FileDescriptor;ILlibcore/util/MutableInt;)I"), 1274 NATIVE_METHOD(Posix, isatty, "(Ljava/io/FileDescriptor;)Z"), 1275 NATIVE_METHOD(Posix, kill, "(II)V"), 1276 NATIVE_METHOD(Posix, listen, "(Ljava/io/FileDescriptor;I)V"), 1277 NATIVE_METHOD(Posix, lseek, "(Ljava/io/FileDescriptor;JI)J"), 1278 NATIVE_METHOD(Posix, lstat, "(Ljava/lang/String;)Llibcore/io/StructStat;"), 1279 NATIVE_METHOD(Posix, mincore, "(JJ[B)V"), 1280 NATIVE_METHOD(Posix, mkdir, "(Ljava/lang/String;I)V"), 1281 NATIVE_METHOD(Posix, mlock, "(JJ)V"), 1282 NATIVE_METHOD(Posix, mmap, "(JJIILjava/io/FileDescriptor;J)J"), 1283 NATIVE_METHOD(Posix, msync, "(JJI)V"), 1284 NATIVE_METHOD(Posix, munlock, "(JJ)V"), 1285 NATIVE_METHOD(Posix, munmap, "(JJ)V"), 1286 NATIVE_METHOD(Posix, open, "(Ljava/lang/String;II)Ljava/io/FileDescriptor;"), 1287 NATIVE_METHOD(Posix, pipe, "()[Ljava/io/FileDescriptor;"), 1288 NATIVE_METHOD(Posix, poll, "([Llibcore/io/StructPollfd;I)I"), 1289 NATIVE_METHOD(Posix, preadBytes, "(Ljava/io/FileDescriptor;Ljava/lang/Object;IIJ)I"), 1290 NATIVE_METHOD(Posix, pwriteBytes, "(Ljava/io/FileDescriptor;Ljava/lang/Object;IIJ)I"), 1291 NATIVE_METHOD(Posix, readBytes, "(Ljava/io/FileDescriptor;Ljava/lang/Object;II)I"), 1292 NATIVE_METHOD(Posix, readv, "(Ljava/io/FileDescriptor;[Ljava/lang/Object;[I[I)I"), 1293 NATIVE_METHOD(Posix, recvfromBytes, "(Ljava/io/FileDescriptor;Ljava/lang/Object;IIILjava/net/InetSocketAddress;)I"), 1294 NATIVE_METHOD(Posix, remove, "(Ljava/lang/String;)V"), 1295 NATIVE_METHOD(Posix, rename, "(Ljava/lang/String;Ljava/lang/String;)V"), 1296 NATIVE_METHOD(Posix, sendfile, "(Ljava/io/FileDescriptor;Ljava/io/FileDescriptor;Llibcore/util/MutableLong;J)J"), 1297 NATIVE_METHOD(Posix, sendtoBytes, "(Ljava/io/FileDescriptor;Ljava/lang/Object;IIILjava/net/InetAddress;I)I"), 1298 NATIVE_METHOD(Posix, setegid, "(I)V"), 1299 NATIVE_METHOD(Posix, seteuid, "(I)V"), 1300 NATIVE_METHOD(Posix, setgid, "(I)V"), 1301 NATIVE_METHOD(Posix, setsockoptByte, "(Ljava/io/FileDescriptor;III)V"), 1302 NATIVE_METHOD(Posix, setsockoptIfreq, "(Ljava/io/FileDescriptor;IILjava/lang/String;)V"), 1303 NATIVE_METHOD(Posix, setsockoptInt, "(Ljava/io/FileDescriptor;III)V"), 1304 NATIVE_METHOD(Posix, setsockoptIpMreqn, "(Ljava/io/FileDescriptor;III)V"), 1305 NATIVE_METHOD(Posix, setsockoptGroupReq, "(Ljava/io/FileDescriptor;IILlibcore/io/StructGroupReq;)V"), 1306 NATIVE_METHOD(Posix, setsockoptLinger, "(Ljava/io/FileDescriptor;IILlibcore/io/StructLinger;)V"), 1307 NATIVE_METHOD(Posix, setsockoptTimeval, "(Ljava/io/FileDescriptor;IILlibcore/io/StructTimeval;)V"), 1308 NATIVE_METHOD(Posix, setuid, "(I)V"), 1309 NATIVE_METHOD(Posix, shutdown, "(Ljava/io/FileDescriptor;I)V"), 1310 NATIVE_METHOD(Posix, socket, "(III)Ljava/io/FileDescriptor;"), 1311 NATIVE_METHOD(Posix, stat, "(Ljava/lang/String;)Llibcore/io/StructStat;"), 1312 NATIVE_METHOD(Posix, statfs, "(Ljava/lang/String;)Llibcore/io/StructStatFs;"), 1313 NATIVE_METHOD(Posix, strerror, "(I)Ljava/lang/String;"), 1314 NATIVE_METHOD(Posix, symlink, "(Ljava/lang/String;Ljava/lang/String;)V"), 1315 NATIVE_METHOD(Posix, sysconf, "(I)J"), 1316 NATIVE_METHOD(Posix, uname, "()Llibcore/io/StructUtsname;"), 1317 NATIVE_METHOD(Posix, waitpid, "(ILlibcore/util/MutableInt;I)I"), 1318 NATIVE_METHOD(Posix, writeBytes, "(Ljava/io/FileDescriptor;Ljava/lang/Object;II)I"), 1319 NATIVE_METHOD(Posix, writev, "(Ljava/io/FileDescriptor;[Ljava/lang/Object;[I[I)I"), 1320 }; 1321 void register_libcore_io_Posix(JNIEnv* env) { 1322 jniRegisterNativeMethods(env, "libcore/io/Posix", gMethods, NELEM(gMethods)); 1323 } 1324
