1 /* //device/libs/android_runtime/android_util_Process.cpp 2 ** 3 ** Copyright 2006, The Android Open Source Project 4 ** 5 ** Licensed under the Apache License, Version 2.0 (the "License"); 6 ** you may not use this file except in compliance with the License. 7 ** You may obtain a copy of the License at 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 11 ** Unless required by applicable law or agreed to in writing, software 12 ** distributed under the License is distributed on an "AS IS" BASIS, 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 ** See the License for the specific language governing permissions and 15 ** limitations under the License. 16 */ 17 18 #define LOG_TAG "Process" 19 20 #include <utils/Log.h> 21 #include <binder/IPCThreadState.h> 22 #include <binder/ProcessState.h> 23 #include <binder/IServiceManager.h> 24 #include <cutils/sched_policy.h> 25 #include <utils/String8.h> 26 #include <utils/Vector.h> 27 28 #include <android_runtime/AndroidRuntime.h> 29 30 #include "android_util_Binder.h" 31 #include "JNIHelp.h" 32 33 #include <sys/errno.h> 34 #include <sys/resource.h> 35 #include <sys/types.h> 36 #include <dirent.h> 37 #include <fcntl.h> 38 #include <grp.h> 39 #include <pwd.h> 40 #include <signal.h> 41 #include <unistd.h> 42 43 #define POLICY_DEBUG 0 44 #define GUARD_THREAD_PRIORITY 0 45 46 using namespace android; 47 48 #if GUARD_THREAD_PRIORITY 49 Mutex gKeyCreateMutex; 50 static pthread_key_t gBgKey = -1; 51 #endif 52 53 // For both of these, err should be in the errno range (positive), not a status_t (negative) 54 55 static void signalExceptionForPriorityError(JNIEnv* env, int err) 56 { 57 switch (err) { 58 case EINVAL: 59 jniThrowException(env, "java/lang/IllegalArgumentException", NULL); 60 break; 61 case ESRCH: 62 jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist"); 63 break; 64 case EPERM: 65 jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread"); 66 break; 67 case EACCES: 68 jniThrowException(env, "java/lang/SecurityException", "No permission to set to given priority"); 69 break; 70 default: 71 jniThrowException(env, "java/lang/RuntimeException", "Unknown error"); 72 break; 73 } 74 } 75 76 static void signalExceptionForGroupError(JNIEnv* env, int err) 77 { 78 switch (err) { 79 case EINVAL: 80 jniThrowException(env, "java/lang/IllegalArgumentException", NULL); 81 break; 82 case ESRCH: 83 jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist"); 84 break; 85 case EPERM: 86 jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread"); 87 break; 88 case EACCES: 89 jniThrowException(env, "java/lang/SecurityException", "No permission to set to given group"); 90 break; 91 default: 92 jniThrowException(env, "java/lang/RuntimeException", "Unknown error"); 93 break; 94 } 95 } 96 97 jint android_os_Process_myPid(JNIEnv* env, jobject clazz) 98 { 99 return getpid(); 100 } 101 102 jint android_os_Process_myUid(JNIEnv* env, jobject clazz) 103 { 104 return getuid(); 105 } 106 107 jint android_os_Process_myTid(JNIEnv* env, jobject clazz) 108 { 109 return androidGetTid(); 110 } 111 112 jint android_os_Process_getUidForName(JNIEnv* env, jobject clazz, jstring name) 113 { 114 if (name == NULL) { 115 jniThrowNullPointerException(env, NULL); 116 return -1; 117 } 118 119 const jchar* str16 = env->GetStringCritical(name, 0); 120 String8 name8; 121 if (str16) { 122 name8 = String8(str16, env->GetStringLength(name)); 123 env->ReleaseStringCritical(name, str16); 124 } 125 126 const size_t N = name8.size(); 127 if (N > 0) { 128 const char* str = name8.string(); 129 for (size_t i=0; i<N; i++) { 130 if (str[i] < '0' || str[i] > '9') { 131 struct passwd* pwd = getpwnam(str); 132 if (pwd == NULL) { 133 return -1; 134 } 135 return pwd->pw_uid; 136 } 137 } 138 return atoi(str); 139 } 140 return -1; 141 } 142 143 jint android_os_Process_getGidForName(JNIEnv* env, jobject clazz, jstring name) 144 { 145 if (name == NULL) { 146 jniThrowNullPointerException(env, NULL); 147 return -1; 148 } 149 150 const jchar* str16 = env->GetStringCritical(name, 0); 151 String8 name8; 152 if (str16) { 153 name8 = String8(str16, env->GetStringLength(name)); 154 env->ReleaseStringCritical(name, str16); 155 } 156 157 const size_t N = name8.size(); 158 if (N > 0) { 159 const char* str = name8.string(); 160 for (size_t i=0; i<N; i++) { 161 if (str[i] < '0' || str[i] > '9') { 162 struct group* grp = getgrnam(str); 163 if (grp == NULL) { 164 return -1; 165 } 166 return grp->gr_gid; 167 } 168 } 169 return atoi(str); 170 } 171 return -1; 172 } 173 174 void android_os_Process_setThreadGroup(JNIEnv* env, jobject clazz, int tid, jint grp) 175 { 176 ALOGV("%s tid=%d grp=%d", __func__, tid, grp); 177 SchedPolicy sp = (SchedPolicy) grp; 178 int res = set_sched_policy(tid, sp); 179 if (res != NO_ERROR) { 180 signalExceptionForGroupError(env, -res); 181 } 182 } 183 184 void android_os_Process_setProcessGroup(JNIEnv* env, jobject clazz, int pid, jint grp) 185 { 186 ALOGV("%s pid=%d grp=%d", __func__, pid, grp); 187 DIR *d; 188 FILE *fp; 189 char proc_path[255]; 190 struct dirent *de; 191 192 if ((grp == SP_FOREGROUND) || (grp > SP_MAX)) { 193 signalExceptionForGroupError(env, EINVAL); 194 return; 195 } 196 197 bool isDefault = false; 198 if (grp < 0) { 199 grp = SP_FOREGROUND; 200 isDefault = true; 201 } 202 SchedPolicy sp = (SchedPolicy) grp; 203 204 #if POLICY_DEBUG 205 char cmdline[32]; 206 int fd; 207 208 strcpy(cmdline, "unknown"); 209 210 sprintf(proc_path, "/proc/%d/cmdline", pid); 211 fd = open(proc_path, O_RDONLY); 212 if (fd >= 0) { 213 int rc = read(fd, cmdline, sizeof(cmdline)-1); 214 cmdline[rc] = 0; 215 close(fd); 216 } 217 218 if (sp == SP_BACKGROUND) { 219 ALOGD("setProcessGroup: vvv pid %d (%s)", pid, cmdline); 220 } else { 221 ALOGD("setProcessGroup: ^^^ pid %d (%s)", pid, cmdline); 222 } 223 #endif 224 sprintf(proc_path, "/proc/%d/task", pid); 225 if (!(d = opendir(proc_path))) { 226 // If the process exited on us, don't generate an exception 227 if (errno != ENOENT) 228 signalExceptionForGroupError(env, errno); 229 return; 230 } 231 232 while ((de = readdir(d))) { 233 int t_pid; 234 int t_pri; 235 236 if (de->d_name[0] == '.') 237 continue; 238 t_pid = atoi(de->d_name); 239 240 if (!t_pid) { 241 ALOGE("Error getting pid for '%s'\n", de->d_name); 242 continue; 243 } 244 245 t_pri = getpriority(PRIO_PROCESS, t_pid); 246 247 if (t_pri <= ANDROID_PRIORITY_AUDIO) { 248 int scheduler = sched_getscheduler(t_pid); 249 if ((scheduler == SCHED_FIFO) || (scheduler == SCHED_RR)) { 250 // This task wants to stay in it's current audio group so it can keep it's budget 251 continue; 252 } 253 } 254 255 if (isDefault) { 256 if (t_pri >= ANDROID_PRIORITY_BACKGROUND) { 257 // This task wants to stay at background 258 continue; 259 } 260 } 261 262 int err = set_sched_policy(t_pid, sp); 263 if (err != NO_ERROR) { 264 signalExceptionForGroupError(env, -err); 265 break; 266 } 267 } 268 closedir(d); 269 } 270 271 static void android_os_Process_setCanSelfBackground(JNIEnv* env, jobject clazz, jboolean bgOk) { 272 // Establishes the calling thread as illegal to put into the background. 273 // Typically used only for the system process's main looper. 274 #if GUARD_THREAD_PRIORITY 275 ALOGV("Process.setCanSelfBackground(%d) : tid=%d", bgOk, androidGetTid()); 276 { 277 Mutex::Autolock _l(gKeyCreateMutex); 278 if (gBgKey == -1) { 279 pthread_key_create(&gBgKey, NULL); 280 } 281 } 282 283 // inverted: not-okay, we set a sentinel value 284 pthread_setspecific(gBgKey, (void*)(bgOk ? 0 : 0xbaad)); 285 #endif 286 } 287 288 void android_os_Process_setThreadScheduler(JNIEnv* env, jclass clazz, 289 jint tid, jint policy, jint pri) 290 { 291 #ifdef HAVE_SCHED_SETSCHEDULER 292 struct sched_param param; 293 param.sched_priority = pri; 294 int rc = sched_setscheduler(tid, policy, ¶m); 295 if (rc) { 296 signalExceptionForPriorityError(env, errno); 297 } 298 #else 299 signalExceptionForPriorityError(env, ENOSYS); 300 #endif 301 } 302 303 void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz, 304 jint pid, jint pri) 305 { 306 #if GUARD_THREAD_PRIORITY 307 // if we're putting the current thread into the background, check the TLS 308 // to make sure this thread isn't guarded. If it is, raise an exception. 309 if (pri >= ANDROID_PRIORITY_BACKGROUND) { 310 if (pid == androidGetTid()) { 311 void* bgOk = pthread_getspecific(gBgKey); 312 if (bgOk == ((void*)0xbaad)) { 313 ALOGE("Thread marked fg-only put self in background!"); 314 jniThrowException(env, "java/lang/SecurityException", "May not put this thread into background"); 315 return; 316 } 317 } 318 } 319 #endif 320 321 int rc = androidSetThreadPriority(pid, pri); 322 if (rc != 0) { 323 if (rc == INVALID_OPERATION) { 324 signalExceptionForPriorityError(env, errno); 325 } else { 326 signalExceptionForGroupError(env, errno); 327 } 328 } 329 330 //ALOGI("Setting priority of %d: %d, getpriority returns %d\n", 331 // pid, pri, getpriority(PRIO_PROCESS, pid)); 332 } 333 334 void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz, 335 jint pri) 336 { 337 jint tid = android_os_Process_myTid(env, clazz); 338 android_os_Process_setThreadPriority(env, clazz, tid, pri); 339 } 340 341 jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz, 342 jint pid) 343 { 344 errno = 0; 345 jint pri = getpriority(PRIO_PROCESS, pid); 346 if (errno != 0) { 347 signalExceptionForPriorityError(env, errno); 348 } 349 //ALOGI("Returning priority of %d: %d\n", pid, pri); 350 return pri; 351 } 352 353 jboolean android_os_Process_setOomAdj(JNIEnv* env, jobject clazz, 354 jint pid, jint adj) 355 { 356 #ifdef HAVE_OOM_ADJ 357 char text[64]; 358 sprintf(text, "/proc/%d/oom_adj", pid); 359 int fd = open(text, O_WRONLY); 360 if (fd >= 0) { 361 sprintf(text, "%d", adj); 362 write(fd, text, strlen(text)); 363 close(fd); 364 } 365 return true; 366 #endif 367 return false; 368 } 369 370 void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name) 371 { 372 if (name == NULL) { 373 jniThrowNullPointerException(env, NULL); 374 return; 375 } 376 377 const jchar* str = env->GetStringCritical(name, 0); 378 String8 name8; 379 if (str) { 380 name8 = String8(str, env->GetStringLength(name)); 381 env->ReleaseStringCritical(name, str); 382 } 383 384 if (name8.size() > 0) { 385 ProcessState::self()->setArgV0(name8.string()); 386 } 387 } 388 389 jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid) 390 { 391 return setuid(uid) == 0 ? 0 : errno; 392 } 393 394 jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid) 395 { 396 return setgid(uid) == 0 ? 0 : errno; 397 } 398 399 static int pid_compare(const void* v1, const void* v2) 400 { 401 //ALOGI("Compare %d vs %d\n", *((const jint*)v1), *((const jint*)v2)); 402 return *((const jint*)v1) - *((const jint*)v2); 403 } 404 405 static jlong getFreeMemoryImpl(const char* const sums[], const int sumsLen[], int num) 406 { 407 int fd = open("/proc/meminfo", O_RDONLY); 408 409 if (fd < 0) { 410 ALOGW("Unable to open /proc/meminfo"); 411 return -1; 412 } 413 414 char buffer[256]; 415 const int len = read(fd, buffer, sizeof(buffer)-1); 416 close(fd); 417 418 if (len < 0) { 419 ALOGW("Unable to read /proc/meminfo"); 420 return -1; 421 } 422 buffer[len] = 0; 423 424 int numFound = 0; 425 jlong mem = 0; 426 427 char* p = buffer; 428 while (*p && numFound < num) { 429 int i = 0; 430 while (sums[i]) { 431 if (strncmp(p, sums[i], sumsLen[i]) == 0) { 432 p += sumsLen[i]; 433 while (*p == ' ') p++; 434 char* num = p; 435 while (*p >= '0' && *p <= '9') p++; 436 if (*p != 0) { 437 *p = 0; 438 p++; 439 if (*p == 0) p--; 440 } 441 mem += atoll(num) * 1024; 442 numFound++; 443 break; 444 } 445 i++; 446 } 447 p++; 448 } 449 450 return numFound > 0 ? mem : -1; 451 } 452 453 static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz) 454 { 455 static const char* const sums[] = { "MemFree:", "Cached:", NULL }; 456 static const int sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), 0 }; 457 return getFreeMemoryImpl(sums, sumsLen, 2); 458 } 459 460 static jlong android_os_Process_getTotalMemory(JNIEnv* env, jobject clazz) 461 { 462 static const char* const sums[] = { "MemTotal:", NULL }; 463 static const int sumsLen[] = { strlen("MemTotal:"), 0 }; 464 return getFreeMemoryImpl(sums, sumsLen, 1); 465 } 466 467 void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr, 468 jobjectArray reqFields, jlongArray outFields) 469 { 470 //ALOGI("getMemInfo: %p %p", reqFields, outFields); 471 472 if (fileStr == NULL || reqFields == NULL || outFields == NULL) { 473 jniThrowNullPointerException(env, NULL); 474 return; 475 } 476 477 const char* file8 = env->GetStringUTFChars(fileStr, NULL); 478 if (file8 == NULL) { 479 return; 480 } 481 String8 file(file8); 482 env->ReleaseStringUTFChars(fileStr, file8); 483 484 jsize count = env->GetArrayLength(reqFields); 485 if (count > env->GetArrayLength(outFields)) { 486 jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ"); 487 return; 488 } 489 490 Vector<String8> fields; 491 int i; 492 493 for (i=0; i<count; i++) { 494 jobject obj = env->GetObjectArrayElement(reqFields, i); 495 if (obj != NULL) { 496 const char* str8 = env->GetStringUTFChars((jstring)obj, NULL); 497 //ALOGI("String at %d: %p = %s", i, obj, str8); 498 if (str8 == NULL) { 499 jniThrowNullPointerException(env, "Element in reqFields"); 500 return; 501 } 502 fields.add(String8(str8)); 503 env->ReleaseStringUTFChars((jstring)obj, str8); 504 } else { 505 jniThrowNullPointerException(env, "Element in reqFields"); 506 return; 507 } 508 } 509 510 jlong* sizesArray = env->GetLongArrayElements(outFields, 0); 511 if (sizesArray == NULL) { 512 return; 513 } 514 515 //ALOGI("Clearing %d sizes", count); 516 for (i=0; i<count; i++) { 517 sizesArray[i] = 0; 518 } 519 520 int fd = open(file.string(), O_RDONLY); 521 522 if (fd >= 0) { 523 const size_t BUFFER_SIZE = 2048; 524 char* buffer = (char*)malloc(BUFFER_SIZE); 525 int len = read(fd, buffer, BUFFER_SIZE-1); 526 close(fd); 527 528 if (len < 0) { 529 ALOGW("Unable to read %s", file.string()); 530 len = 0; 531 } 532 buffer[len] = 0; 533 534 int foundCount = 0; 535 536 char* p = buffer; 537 while (*p && foundCount < count) { 538 bool skipToEol = true; 539 //ALOGI("Parsing at: %s", p); 540 for (i=0; i<count; i++) { 541 const String8& field = fields[i]; 542 if (strncmp(p, field.string(), field.length()) == 0) { 543 p += field.length(); 544 while (*p == ' ' || *p == '\t') p++; 545 char* num = p; 546 while (*p >= '0' && *p <= '9') p++; 547 skipToEol = *p != '\n'; 548 if (*p != 0) { 549 *p = 0; 550 p++; 551 } 552 char* end; 553 sizesArray[i] = strtoll(num, &end, 10); 554 //ALOGI("Field %s = %d", field.string(), sizesArray[i]); 555 foundCount++; 556 break; 557 } 558 } 559 if (skipToEol) { 560 while (*p && *p != '\n') { 561 p++; 562 } 563 if (*p == '\n') { 564 p++; 565 } 566 } 567 } 568 569 free(buffer); 570 } else { 571 ALOGW("Unable to open %s", file.string()); 572 } 573 574 //ALOGI("Done!"); 575 env->ReleaseLongArrayElements(outFields, sizesArray, 0); 576 } 577 578 jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz, 579 jstring file, jintArray lastArray) 580 { 581 if (file == NULL) { 582 jniThrowNullPointerException(env, NULL); 583 return NULL; 584 } 585 586 const char* file8 = env->GetStringUTFChars(file, NULL); 587 if (file8 == NULL) { 588 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 589 return NULL; 590 } 591 592 DIR* dirp = opendir(file8); 593 594 env->ReleaseStringUTFChars(file, file8); 595 596 if(dirp == NULL) { 597 return NULL; 598 } 599 600 jsize curCount = 0; 601 jint* curData = NULL; 602 if (lastArray != NULL) { 603 curCount = env->GetArrayLength(lastArray); 604 curData = env->GetIntArrayElements(lastArray, 0); 605 } 606 607 jint curPos = 0; 608 609 struct dirent* entry; 610 while ((entry=readdir(dirp)) != NULL) { 611 const char* p = entry->d_name; 612 while (*p) { 613 if (*p < '0' || *p > '9') break; 614 p++; 615 } 616 if (*p != 0) continue; 617 618 char* end; 619 int pid = strtol(entry->d_name, &end, 10); 620 //ALOGI("File %s pid=%d\n", entry->d_name, pid); 621 if (curPos >= curCount) { 622 jsize newCount = (curCount == 0) ? 10 : (curCount*2); 623 jintArray newArray = env->NewIntArray(newCount); 624 if (newArray == NULL) { 625 closedir(dirp); 626 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 627 return NULL; 628 } 629 jint* newData = env->GetIntArrayElements(newArray, 0); 630 if (curData != NULL) { 631 memcpy(newData, curData, sizeof(jint)*curCount); 632 env->ReleaseIntArrayElements(lastArray, curData, 0); 633 } 634 lastArray = newArray; 635 curCount = newCount; 636 curData = newData; 637 } 638 639 curData[curPos] = pid; 640 curPos++; 641 } 642 643 closedir(dirp); 644 645 if (curData != NULL && curPos > 0) { 646 qsort(curData, curPos, sizeof(jint), pid_compare); 647 } 648 649 while (curPos < curCount) { 650 curData[curPos] = -1; 651 curPos++; 652 } 653 654 if (curData != NULL) { 655 env->ReleaseIntArrayElements(lastArray, curData, 0); 656 } 657 658 return lastArray; 659 } 660 661 enum { 662 PROC_TERM_MASK = 0xff, 663 PROC_ZERO_TERM = 0, 664 PROC_SPACE_TERM = ' ', 665 PROC_COMBINE = 0x100, 666 PROC_PARENS = 0x200, 667 PROC_OUT_STRING = 0x1000, 668 PROC_OUT_LONG = 0x2000, 669 PROC_OUT_FLOAT = 0x4000, 670 }; 671 672 jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz, 673 char* buffer, jint startIndex, jint endIndex, jintArray format, 674 jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats) 675 { 676 677 const jsize NF = env->GetArrayLength(format); 678 const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0; 679 const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0; 680 const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0; 681 682 jint* formatData = env->GetIntArrayElements(format, 0); 683 jlong* longsData = outLongs ? 684 env->GetLongArrayElements(outLongs, 0) : NULL; 685 jfloat* floatsData = outFloats ? 686 env->GetFloatArrayElements(outFloats, 0) : NULL; 687 if (formatData == NULL || (NL > 0 && longsData == NULL) 688 || (NR > 0 && floatsData == NULL)) { 689 if (formatData != NULL) { 690 env->ReleaseIntArrayElements(format, formatData, 0); 691 } 692 if (longsData != NULL) { 693 env->ReleaseLongArrayElements(outLongs, longsData, 0); 694 } 695 if (floatsData != NULL) { 696 env->ReleaseFloatArrayElements(outFloats, floatsData, 0); 697 } 698 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 699 return JNI_FALSE; 700 } 701 702 jsize i = startIndex; 703 jsize di = 0; 704 705 jboolean res = JNI_TRUE; 706 707 for (jsize fi=0; fi<NF; fi++) { 708 const jint mode = formatData[fi]; 709 if ((mode&PROC_PARENS) != 0) { 710 i++; 711 } 712 const char term = (char)(mode&PROC_TERM_MASK); 713 const jsize start = i; 714 if (i >= endIndex) { 715 res = JNI_FALSE; 716 break; 717 } 718 719 jsize end = -1; 720 if ((mode&PROC_PARENS) != 0) { 721 while (buffer[i] != ')' && i < endIndex) { 722 i++; 723 } 724 end = i; 725 i++; 726 } 727 while (buffer[i] != term && i < endIndex) { 728 i++; 729 } 730 if (end < 0) { 731 end = i; 732 } 733 734 if (i < endIndex) { 735 i++; 736 if ((mode&PROC_COMBINE) != 0) { 737 while (buffer[i] == term && i < endIndex) { 738 i++; 739 } 740 } 741 } 742 743 //ALOGI("Field %d: %d-%d dest=%d mode=0x%x\n", i, start, end, di, mode); 744 745 if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) { 746 char c = buffer[end]; 747 buffer[end] = 0; 748 if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) { 749 char* end; 750 floatsData[di] = strtof(buffer+start, &end); 751 } 752 if ((mode&PROC_OUT_LONG) != 0 && di < NL) { 753 char* end; 754 longsData[di] = strtoll(buffer+start, &end, 10); 755 } 756 if ((mode&PROC_OUT_STRING) != 0 && di < NS) { 757 jstring str = env->NewStringUTF(buffer+start); 758 env->SetObjectArrayElement(outStrings, di, str); 759 } 760 buffer[end] = c; 761 di++; 762 } 763 } 764 765 env->ReleaseIntArrayElements(format, formatData, 0); 766 if (longsData != NULL) { 767 env->ReleaseLongArrayElements(outLongs, longsData, 0); 768 } 769 if (floatsData != NULL) { 770 env->ReleaseFloatArrayElements(outFloats, floatsData, 0); 771 } 772 773 return res; 774 } 775 776 jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz, 777 jbyteArray buffer, jint startIndex, jint endIndex, jintArray format, 778 jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats) 779 { 780 jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL); 781 782 jboolean result = android_os_Process_parseProcLineArray(env, clazz, 783 (char*) bufferArray, startIndex, endIndex, format, outStrings, 784 outLongs, outFloats); 785 786 env->ReleaseByteArrayElements(buffer, bufferArray, 0); 787 788 return result; 789 } 790 791 jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz, 792 jstring file, jintArray format, jobjectArray outStrings, 793 jlongArray outLongs, jfloatArray outFloats) 794 { 795 if (file == NULL || format == NULL) { 796 jniThrowNullPointerException(env, NULL); 797 return JNI_FALSE; 798 } 799 800 const char* file8 = env->GetStringUTFChars(file, NULL); 801 if (file8 == NULL) { 802 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 803 return JNI_FALSE; 804 } 805 int fd = open(file8, O_RDONLY); 806 env->ReleaseStringUTFChars(file, file8); 807 808 if (fd < 0) { 809 //ALOGW("Unable to open process file: %s\n", file8); 810 return JNI_FALSE; 811 } 812 813 char buffer[256]; 814 const int len = read(fd, buffer, sizeof(buffer)-1); 815 close(fd); 816 817 if (len < 0) { 818 //ALOGW("Unable to open process file: %s fd=%d\n", file8, fd); 819 return JNI_FALSE; 820 } 821 buffer[len] = 0; 822 823 return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len, 824 format, outStrings, outLongs, outFloats); 825 826 } 827 828 void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz, 829 jobject binderObject) 830 { 831 if (binderObject == NULL) { 832 jniThrowNullPointerException(env, NULL); 833 return; 834 } 835 836 sp<IBinder> binder = ibinderForJavaObject(env, binderObject); 837 } 838 839 void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig) 840 { 841 if (pid > 0) { 842 ALOGI("Sending signal. PID: %d SIG: %d", pid, sig); 843 kill(pid, sig); 844 } 845 } 846 847 void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig) 848 { 849 if (pid > 0) { 850 kill(pid, sig); 851 } 852 } 853 854 static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz) 855 { 856 struct timespec ts; 857 858 int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts); 859 860 if (res != 0) { 861 return (jlong) 0; 862 } 863 864 nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec; 865 return (jlong) nanoseconds_to_milliseconds(when); 866 } 867 868 static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid) 869 { 870 char filename[64]; 871 872 snprintf(filename, sizeof(filename), "/proc/%d/smaps", pid); 873 874 FILE * file = fopen(filename, "r"); 875 if (!file) { 876 return (jlong) -1; 877 } 878 879 // Tally up all of the Pss from the various maps 880 char line[256]; 881 jlong pss = 0; 882 while (fgets(line, sizeof(line), file)) { 883 jlong v; 884 if (sscanf(line, "Pss: %lld kB", &v) == 1) { 885 pss += v; 886 } 887 } 888 889 fclose(file); 890 891 // Return the Pss value in bytes, not kilobytes 892 return pss * 1024; 893 } 894 895 jintArray android_os_Process_getPidsForCommands(JNIEnv* env, jobject clazz, 896 jobjectArray commandNames) 897 { 898 if (commandNames == NULL) { 899 jniThrowNullPointerException(env, NULL); 900 return NULL; 901 } 902 903 Vector<String8> commands; 904 905 jsize count = env->GetArrayLength(commandNames); 906 907 for (int i=0; i<count; i++) { 908 jobject obj = env->GetObjectArrayElement(commandNames, i); 909 if (obj != NULL) { 910 const char* str8 = env->GetStringUTFChars((jstring)obj, NULL); 911 if (str8 == NULL) { 912 jniThrowNullPointerException(env, "Element in commandNames"); 913 return NULL; 914 } 915 commands.add(String8(str8)); 916 env->ReleaseStringUTFChars((jstring)obj, str8); 917 } else { 918 jniThrowNullPointerException(env, "Element in commandNames"); 919 return NULL; 920 } 921 } 922 923 Vector<jint> pids; 924 925 DIR *proc = opendir("/proc"); 926 if (proc == NULL) { 927 fprintf(stderr, "/proc: %s\n", strerror(errno)); 928 return NULL; 929 } 930 931 struct dirent *d; 932 while ((d = readdir(proc))) { 933 int pid = atoi(d->d_name); 934 if (pid <= 0) continue; 935 936 char path[PATH_MAX]; 937 char data[PATH_MAX]; 938 snprintf(path, sizeof(path), "/proc/%d/cmdline", pid); 939 940 int fd = open(path, O_RDONLY); 941 if (fd < 0) { 942 continue; 943 } 944 const int len = read(fd, data, sizeof(data)-1); 945 close(fd); 946 947 if (len < 0) { 948 continue; 949 } 950 data[len] = 0; 951 952 for (int i=0; i<len; i++) { 953 if (data[i] == ' ') { 954 data[i] = 0; 955 break; 956 } 957 } 958 959 for (size_t i=0; i<commands.size(); i++) { 960 if (commands[i] == data) { 961 pids.add(pid); 962 break; 963 } 964 } 965 } 966 967 closedir(proc); 968 969 jintArray pidArray = env->NewIntArray(pids.size()); 970 if (pidArray == NULL) { 971 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 972 return NULL; 973 } 974 975 if (pids.size() > 0) { 976 env->SetIntArrayRegion(pidArray, 0, pids.size(), pids.array()); 977 } 978 979 return pidArray; 980 } 981 982 static const JNINativeMethod methods[] = { 983 {"myPid", "()I", (void*)android_os_Process_myPid}, 984 {"myTid", "()I", (void*)android_os_Process_myTid}, 985 {"myUid", "()I", (void*)android_os_Process_myUid}, 986 {"getUidForName", "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName}, 987 {"getGidForName", "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName}, 988 {"setThreadPriority", "(II)V", (void*)android_os_Process_setThreadPriority}, 989 {"setThreadScheduler", "(III)V", (void*)android_os_Process_setThreadScheduler}, 990 {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground}, 991 {"setThreadPriority", "(I)V", (void*)android_os_Process_setCallingThreadPriority}, 992 {"getThreadPriority", "(I)I", (void*)android_os_Process_getThreadPriority}, 993 {"setThreadGroup", "(II)V", (void*)android_os_Process_setThreadGroup}, 994 {"setProcessGroup", "(II)V", (void*)android_os_Process_setProcessGroup}, 995 {"setOomAdj", "(II)Z", (void*)android_os_Process_setOomAdj}, 996 {"setArgV0", "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0}, 997 {"setUid", "(I)I", (void*)android_os_Process_setUid}, 998 {"setGid", "(I)I", (void*)android_os_Process_setGid}, 999 {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal}, 1000 {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet}, 1001 {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory}, 1002 {"getTotalMemory", "()J", (void*)android_os_Process_getTotalMemory}, 1003 {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines}, 1004 {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids}, 1005 {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile}, 1006 {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine}, 1007 {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime}, 1008 {"getPss", "(I)J", (void*)android_os_Process_getPss}, 1009 {"getPidsForCommands", "([Ljava/lang/String;)[I", (void*)android_os_Process_getPidsForCommands}, 1010 //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject}, 1011 }; 1012 1013 const char* const kProcessPathName = "android/os/Process"; 1014 1015 int register_android_os_Process(JNIEnv* env) 1016 { 1017 return AndroidRuntime::registerNativeMethods( 1018 env, kProcessPathName, 1019 methods, NELEM(methods)); 1020 } 1021