android_util_Process.cpp revision 6215d3ff4b5dfa52a5d8b9a42e343051f31066a5
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 <utils/String8.h> 25#include <utils/Vector.h> 26 27#include <android_runtime/AndroidRuntime.h> 28 29#include "android_util_Binder.h" 30#include "JNIHelp.h" 31 32#include <sys/errno.h> 33#include <sys/resource.h> 34#include <sys/types.h> 35#include <cutils/sched_policy.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 46using namespace android; 47 48#if GUARD_THREAD_PRIORITY 49Mutex gKeyCreateMutex; 50static pthread_key_t gBgKey = -1; 51#endif 52 53static void signalExceptionForPriorityError(JNIEnv* env, jobject obj, int err) 54{ 55 switch (err) { 56 case EINVAL: 57 jniThrowException(env, "java/lang/IllegalArgumentException", NULL); 58 break; 59 case ESRCH: 60 jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist"); 61 break; 62 case EPERM: 63 jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread"); 64 break; 65 case EACCES: 66 jniThrowException(env, "java/lang/SecurityException", "No permission to set to given priority"); 67 break; 68 default: 69 jniThrowException(env, "java/lang/RuntimeException", "Unknown error"); 70 break; 71 } 72} 73 74static void signalExceptionForGroupError(JNIEnv* env, jobject obj, int err) 75{ 76 switch (err) { 77 case EINVAL: 78 jniThrowException(env, "java/lang/IllegalArgumentException", NULL); 79 break; 80 case ESRCH: 81 jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist"); 82 break; 83 case EPERM: 84 jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread"); 85 break; 86 case EACCES: 87 jniThrowException(env, "java/lang/SecurityException", "No permission to set to given group"); 88 break; 89 default: 90 jniThrowException(env, "java/lang/RuntimeException", "Unknown error"); 91 break; 92 } 93} 94 95jint android_os_Process_myPid(JNIEnv* env, jobject clazz) 96{ 97 return getpid(); 98} 99 100jint android_os_Process_myUid(JNIEnv* env, jobject clazz) 101{ 102 return getuid(); 103} 104 105jint android_os_Process_myTid(JNIEnv* env, jobject clazz) 106{ 107 return androidGetTid(); 108} 109 110jint android_os_Process_getUidForName(JNIEnv* env, jobject clazz, jstring name) 111{ 112 if (name == NULL) { 113 jniThrowNullPointerException(env, NULL); 114 return -1; 115 } 116 117 const jchar* str16 = env->GetStringCritical(name, 0); 118 String8 name8; 119 if (str16) { 120 name8 = String8(str16, env->GetStringLength(name)); 121 env->ReleaseStringCritical(name, str16); 122 } 123 124 const size_t N = name8.size(); 125 if (N > 0) { 126 const char* str = name8.string(); 127 for (size_t i=0; i<N; i++) { 128 if (str[i] < '0' || str[i] > '9') { 129 struct passwd* pwd = getpwnam(str); 130 if (pwd == NULL) { 131 return -1; 132 } 133 return pwd->pw_uid; 134 } 135 } 136 return atoi(str); 137 } 138 return -1; 139} 140 141jint android_os_Process_getGidForName(JNIEnv* env, jobject clazz, jstring name) 142{ 143 if (name == NULL) { 144 jniThrowNullPointerException(env, NULL); 145 return -1; 146 } 147 148 const jchar* str16 = env->GetStringCritical(name, 0); 149 String8 name8; 150 if (str16) { 151 name8 = String8(str16, env->GetStringLength(name)); 152 env->ReleaseStringCritical(name, str16); 153 } 154 155 const size_t N = name8.size(); 156 if (N > 0) { 157 const char* str = name8.string(); 158 for (size_t i=0; i<N; i++) { 159 if (str[i] < '0' || str[i] > '9') { 160 struct group* grp = getgrnam(str); 161 if (grp == NULL) { 162 return -1; 163 } 164 return grp->gr_gid; 165 } 166 } 167 return atoi(str); 168 } 169 return -1; 170} 171 172void android_os_Process_setThreadGroup(JNIEnv* env, jobject clazz, int pid, jint grp) 173{ 174 int res = androidSetThreadSchedulingGroup(pid, grp); 175 if (res != NO_ERROR) { 176 signalExceptionForGroupError(env, clazz, res == BAD_VALUE ? EINVAL : errno); 177 return; 178 } 179} 180 181void android_os_Process_setProcessGroup(JNIEnv* env, jobject clazz, int pid, jint grp) 182{ 183 DIR *d; 184 FILE *fp; 185 char proc_path[255]; 186 struct dirent *de; 187 188 if (grp > ANDROID_TGROUP_MAX || grp < 0) { 189 signalExceptionForGroupError(env, clazz, EINVAL); 190 return; 191 } 192 193#if POLICY_DEBUG 194 char cmdline[32]; 195 int fd; 196 197 strcpy(cmdline, "unknown"); 198 199 sprintf(proc_path, "/proc/%d/cmdline", pid); 200 fd = open(proc_path, O_RDONLY); 201 if (fd >= 0) { 202 int rc = read(fd, cmdline, sizeof(cmdline)-1); 203 cmdline[rc] = 0; 204 close(fd); 205 } 206 207 if (grp == ANDROID_TGROUP_BG_NONINTERACT) { 208 ALOGD("setProcessGroup: vvv pid %d (%s)", pid, cmdline); 209 } else { 210 ALOGD("setProcessGroup: ^^^ pid %d (%s)", pid, cmdline); 211 } 212#endif 213 sprintf(proc_path, "/proc/%d/task", pid); 214 if (!(d = opendir(proc_path))) { 215 // If the process exited on us, don't generate an exception 216 if (errno != ENOENT) 217 signalExceptionForGroupError(env, clazz, errno); 218 return; 219 } 220 221 while ((de = readdir(d))) { 222 int t_pid; 223 int t_pri; 224 225 if (de->d_name[0] == '.') 226 continue; 227 t_pid = atoi(de->d_name); 228 229 if (!t_pid) { 230 LOGE("Error getting pid for '%s'\n", de->d_name); 231 continue; 232 } 233 234 t_pri = getpriority(PRIO_PROCESS, t_pid); 235 236 if (grp == ANDROID_TGROUP_DEFAULT && 237 t_pri >= ANDROID_PRIORITY_BACKGROUND) { 238 // This task wants to stay at background 239 continue; 240 } 241 242 if (androidSetThreadSchedulingGroup(t_pid, grp) != NO_ERROR) { 243 signalExceptionForGroupError(env, clazz, errno); 244 break; 245 } 246 } 247 closedir(d); 248} 249 250static void android_os_Process_setCanSelfBackground(JNIEnv* env, jobject clazz, jboolean bgOk) { 251 // Establishes the calling thread as illegal to put into the background. 252 // Typically used only for the system process's main looper. 253#if GUARD_THREAD_PRIORITY 254 ALOGV("Process.setCanSelfBackground(%d) : tid=%d", bgOk, androidGetTid()); 255 { 256 Mutex::Autolock _l(gKeyCreateMutex); 257 if (gBgKey == -1) { 258 pthread_key_create(&gBgKey, NULL); 259 } 260 } 261 262 // inverted: not-okay, we set a sentinel value 263 pthread_setspecific(gBgKey, (void*)(bgOk ? 0 : 0xbaad)); 264#endif 265} 266 267void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz, 268 jint pid, jint pri) 269{ 270#if GUARD_THREAD_PRIORITY 271 // if we're putting the current thread into the background, check the TLS 272 // to make sure this thread isn't guarded. If it is, raise an exception. 273 if (pri >= ANDROID_PRIORITY_BACKGROUND) { 274 if (pid == androidGetTid()) { 275 void* bgOk = pthread_getspecific(gBgKey); 276 if (bgOk == ((void*)0xbaad)) { 277 LOGE("Thread marked fg-only put self in background!"); 278 jniThrowException(env, "java/lang/SecurityException", "May not put this thread into background"); 279 return; 280 } 281 } 282 } 283#endif 284 285 int rc = androidSetThreadPriority(pid, pri); 286 if (rc != 0) { 287 if (rc == INVALID_OPERATION) { 288 signalExceptionForPriorityError(env, clazz, errno); 289 } else { 290 signalExceptionForGroupError(env, clazz, errno); 291 } 292 } 293 294 //ALOGI("Setting priority of %d: %d, getpriority returns %d\n", 295 // pid, pri, getpriority(PRIO_PROCESS, pid)); 296} 297 298void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz, 299 jint pri) 300{ 301 jint tid = android_os_Process_myTid(env, clazz); 302 android_os_Process_setThreadPriority(env, clazz, tid, pri); 303} 304 305jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz, 306 jint pid) 307{ 308 errno = 0; 309 jint pri = getpriority(PRIO_PROCESS, pid); 310 if (errno != 0) { 311 signalExceptionForPriorityError(env, clazz, errno); 312 } 313 //ALOGI("Returning priority of %d: %d\n", pid, pri); 314 return pri; 315} 316 317jboolean android_os_Process_setOomAdj(JNIEnv* env, jobject clazz, 318 jint pid, jint adj) 319{ 320#ifdef HAVE_OOM_ADJ 321 char text[64]; 322 sprintf(text, "/proc/%d/oom_adj", pid); 323 int fd = open(text, O_WRONLY); 324 if (fd >= 0) { 325 sprintf(text, "%d", adj); 326 write(fd, text, strlen(text)); 327 close(fd); 328 } 329 return true; 330#endif 331 return false; 332} 333 334void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name) 335{ 336 if (name == NULL) { 337 jniThrowNullPointerException(env, NULL); 338 return; 339 } 340 341 const jchar* str = env->GetStringCritical(name, 0); 342 String8 name8; 343 if (str) { 344 name8 = String8(str, env->GetStringLength(name)); 345 env->ReleaseStringCritical(name, str); 346 } 347 348 if (name8.size() > 0) { 349 ProcessState::self()->setArgV0(name8.string()); 350 } 351} 352 353jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid) 354{ 355 return setuid(uid) == 0 ? 0 : errno; 356} 357 358jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid) 359{ 360 return setgid(uid) == 0 ? 0 : errno; 361} 362 363static int pid_compare(const void* v1, const void* v2) 364{ 365 //ALOGI("Compare %d vs %d\n", *((const jint*)v1), *((const jint*)v2)); 366 return *((const jint*)v1) - *((const jint*)v2); 367} 368 369static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz) 370{ 371 int fd = open("/proc/meminfo", O_RDONLY); 372 373 if (fd < 0) { 374 LOGW("Unable to open /proc/meminfo"); 375 return -1; 376 } 377 378 char buffer[256]; 379 const int len = read(fd, buffer, sizeof(buffer)-1); 380 close(fd); 381 382 if (len < 0) { 383 LOGW("Unable to read /proc/meminfo"); 384 return -1; 385 } 386 buffer[len] = 0; 387 388 int numFound = 0; 389 jlong mem = 0; 390 391 static const char* const sums[] = { "MemFree:", "Cached:", NULL }; 392 static const int sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), NULL }; 393 394 char* p = buffer; 395 while (*p && numFound < 2) { 396 int i = 0; 397 while (sums[i]) { 398 if (strncmp(p, sums[i], sumsLen[i]) == 0) { 399 p += sumsLen[i]; 400 while (*p == ' ') p++; 401 char* num = p; 402 while (*p >= '0' && *p <= '9') p++; 403 if (*p != 0) { 404 *p = 0; 405 p++; 406 if (*p == 0) p--; 407 } 408 mem += atoll(num) * 1024; 409 numFound++; 410 break; 411 } 412 i++; 413 } 414 p++; 415 } 416 417 return numFound > 0 ? mem : -1; 418} 419 420void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr, 421 jobjectArray reqFields, jlongArray outFields) 422{ 423 //ALOGI("getMemInfo: %p %p", reqFields, outFields); 424 425 if (fileStr == NULL || reqFields == NULL || outFields == NULL) { 426 jniThrowNullPointerException(env, NULL); 427 return; 428 } 429 430 const char* file8 = env->GetStringUTFChars(fileStr, NULL); 431 if (file8 == NULL) { 432 return; 433 } 434 String8 file(file8); 435 env->ReleaseStringUTFChars(fileStr, file8); 436 437 jsize count = env->GetArrayLength(reqFields); 438 if (count > env->GetArrayLength(outFields)) { 439 jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ"); 440 return; 441 } 442 443 Vector<String8> fields; 444 int i; 445 446 for (i=0; i<count; i++) { 447 jobject obj = env->GetObjectArrayElement(reqFields, i); 448 if (obj != NULL) { 449 const char* str8 = env->GetStringUTFChars((jstring)obj, NULL); 450 //ALOGI("String at %d: %p = %s", i, obj, str8); 451 if (str8 == NULL) { 452 jniThrowNullPointerException(env, "Element in reqFields"); 453 return; 454 } 455 fields.add(String8(str8)); 456 env->ReleaseStringUTFChars((jstring)obj, str8); 457 } else { 458 jniThrowNullPointerException(env, "Element in reqFields"); 459 return; 460 } 461 } 462 463 jlong* sizesArray = env->GetLongArrayElements(outFields, 0); 464 if (sizesArray == NULL) { 465 return; 466 } 467 468 //ALOGI("Clearing %d sizes", count); 469 for (i=0; i<count; i++) { 470 sizesArray[i] = 0; 471 } 472 473 int fd = open(file.string(), O_RDONLY); 474 475 if (fd >= 0) { 476 const size_t BUFFER_SIZE = 2048; 477 char* buffer = (char*)malloc(BUFFER_SIZE); 478 int len = read(fd, buffer, BUFFER_SIZE-1); 479 close(fd); 480 481 if (len < 0) { 482 LOGW("Unable to read %s", file.string()); 483 len = 0; 484 } 485 buffer[len] = 0; 486 487 int foundCount = 0; 488 489 char* p = buffer; 490 while (*p && foundCount < count) { 491 bool skipToEol = true; 492 //ALOGI("Parsing at: %s", p); 493 for (i=0; i<count; i++) { 494 const String8& field = fields[i]; 495 if (strncmp(p, field.string(), field.length()) == 0) { 496 p += field.length(); 497 while (*p == ' ' || *p == '\t') p++; 498 char* num = p; 499 while (*p >= '0' && *p <= '9') p++; 500 skipToEol = *p != '\n'; 501 if (*p != 0) { 502 *p = 0; 503 p++; 504 } 505 char* end; 506 sizesArray[i] = strtoll(num, &end, 10); 507 //ALOGI("Field %s = %d", field.string(), sizesArray[i]); 508 foundCount++; 509 break; 510 } 511 } 512 if (skipToEol) { 513 while (*p && *p != '\n') { 514 p++; 515 } 516 if (*p == '\n') { 517 p++; 518 } 519 } 520 } 521 522 free(buffer); 523 } else { 524 LOGW("Unable to open %s", file.string()); 525 } 526 527 //ALOGI("Done!"); 528 env->ReleaseLongArrayElements(outFields, sizesArray, 0); 529} 530 531jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz, 532 jstring file, jintArray lastArray) 533{ 534 if (file == NULL) { 535 jniThrowNullPointerException(env, NULL); 536 return NULL; 537 } 538 539 const char* file8 = env->GetStringUTFChars(file, NULL); 540 if (file8 == NULL) { 541 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 542 return NULL; 543 } 544 545 DIR* dirp = opendir(file8); 546 547 env->ReleaseStringUTFChars(file, file8); 548 549 if(dirp == NULL) { 550 return NULL; 551 } 552 553 jsize curCount = 0; 554 jint* curData = NULL; 555 if (lastArray != NULL) { 556 curCount = env->GetArrayLength(lastArray); 557 curData = env->GetIntArrayElements(lastArray, 0); 558 } 559 560 jint curPos = 0; 561 562 struct dirent* entry; 563 while ((entry=readdir(dirp)) != NULL) { 564 const char* p = entry->d_name; 565 while (*p) { 566 if (*p < '0' || *p > '9') break; 567 p++; 568 } 569 if (*p != 0) continue; 570 571 char* end; 572 int pid = strtol(entry->d_name, &end, 10); 573 //ALOGI("File %s pid=%d\n", entry->d_name, pid); 574 if (curPos >= curCount) { 575 jsize newCount = (curCount == 0) ? 10 : (curCount*2); 576 jintArray newArray = env->NewIntArray(newCount); 577 if (newArray == NULL) { 578 closedir(dirp); 579 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 580 return NULL; 581 } 582 jint* newData = env->GetIntArrayElements(newArray, 0); 583 if (curData != NULL) { 584 memcpy(newData, curData, sizeof(jint)*curCount); 585 env->ReleaseIntArrayElements(lastArray, curData, 0); 586 } 587 lastArray = newArray; 588 curCount = newCount; 589 curData = newData; 590 } 591 592 curData[curPos] = pid; 593 curPos++; 594 } 595 596 closedir(dirp); 597 598 if (curData != NULL && curPos > 0) { 599 qsort(curData, curPos, sizeof(jint), pid_compare); 600 } 601 602 while (curPos < curCount) { 603 curData[curPos] = -1; 604 curPos++; 605 } 606 607 if (curData != NULL) { 608 env->ReleaseIntArrayElements(lastArray, curData, 0); 609 } 610 611 return lastArray; 612} 613 614enum { 615 PROC_TERM_MASK = 0xff, 616 PROC_ZERO_TERM = 0, 617 PROC_SPACE_TERM = ' ', 618 PROC_COMBINE = 0x100, 619 PROC_PARENS = 0x200, 620 PROC_OUT_STRING = 0x1000, 621 PROC_OUT_LONG = 0x2000, 622 PROC_OUT_FLOAT = 0x4000, 623}; 624 625jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz, 626 char* buffer, jint startIndex, jint endIndex, jintArray format, 627 jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats) 628{ 629 630 const jsize NF = env->GetArrayLength(format); 631 const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0; 632 const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0; 633 const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0; 634 635 jint* formatData = env->GetIntArrayElements(format, 0); 636 jlong* longsData = outLongs ? 637 env->GetLongArrayElements(outLongs, 0) : NULL; 638 jfloat* floatsData = outFloats ? 639 env->GetFloatArrayElements(outFloats, 0) : NULL; 640 if (formatData == NULL || (NL > 0 && longsData == NULL) 641 || (NR > 0 && floatsData == NULL)) { 642 if (formatData != NULL) { 643 env->ReleaseIntArrayElements(format, formatData, 0); 644 } 645 if (longsData != NULL) { 646 env->ReleaseLongArrayElements(outLongs, longsData, 0); 647 } 648 if (floatsData != NULL) { 649 env->ReleaseFloatArrayElements(outFloats, floatsData, 0); 650 } 651 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 652 return JNI_FALSE; 653 } 654 655 jsize i = startIndex; 656 jsize di = 0; 657 658 jboolean res = JNI_TRUE; 659 660 for (jsize fi=0; fi<NF; fi++) { 661 const jint mode = formatData[fi]; 662 if ((mode&PROC_PARENS) != 0) { 663 i++; 664 } 665 const char term = (char)(mode&PROC_TERM_MASK); 666 const jsize start = i; 667 if (i >= endIndex) { 668 res = JNI_FALSE; 669 break; 670 } 671 672 jsize end = -1; 673 if ((mode&PROC_PARENS) != 0) { 674 while (buffer[i] != ')' && i < endIndex) { 675 i++; 676 } 677 end = i; 678 i++; 679 } 680 while (buffer[i] != term && i < endIndex) { 681 i++; 682 } 683 if (end < 0) { 684 end = i; 685 } 686 687 if (i < endIndex) { 688 i++; 689 if ((mode&PROC_COMBINE) != 0) { 690 while (buffer[i] == term && i < endIndex) { 691 i++; 692 } 693 } 694 } 695 696 //ALOGI("Field %d: %d-%d dest=%d mode=0x%x\n", i, start, end, di, mode); 697 698 if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) { 699 char c = buffer[end]; 700 buffer[end] = 0; 701 if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) { 702 char* end; 703 floatsData[di] = strtof(buffer+start, &end); 704 } 705 if ((mode&PROC_OUT_LONG) != 0 && di < NL) { 706 char* end; 707 longsData[di] = strtoll(buffer+start, &end, 10); 708 } 709 if ((mode&PROC_OUT_STRING) != 0 && di < NS) { 710 jstring str = env->NewStringUTF(buffer+start); 711 env->SetObjectArrayElement(outStrings, di, str); 712 } 713 buffer[end] = c; 714 di++; 715 } 716 } 717 718 env->ReleaseIntArrayElements(format, formatData, 0); 719 if (longsData != NULL) { 720 env->ReleaseLongArrayElements(outLongs, longsData, 0); 721 } 722 if (floatsData != NULL) { 723 env->ReleaseFloatArrayElements(outFloats, floatsData, 0); 724 } 725 726 return res; 727} 728 729jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz, 730 jbyteArray buffer, jint startIndex, jint endIndex, jintArray format, 731 jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats) 732{ 733 jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL); 734 735 jboolean result = android_os_Process_parseProcLineArray(env, clazz, 736 (char*) bufferArray, startIndex, endIndex, format, outStrings, 737 outLongs, outFloats); 738 739 env->ReleaseByteArrayElements(buffer, bufferArray, 0); 740 741 return result; 742} 743 744jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz, 745 jstring file, jintArray format, jobjectArray outStrings, 746 jlongArray outLongs, jfloatArray outFloats) 747{ 748 if (file == NULL || format == NULL) { 749 jniThrowNullPointerException(env, NULL); 750 return JNI_FALSE; 751 } 752 753 const char* file8 = env->GetStringUTFChars(file, NULL); 754 if (file8 == NULL) { 755 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 756 return JNI_FALSE; 757 } 758 int fd = open(file8, O_RDONLY); 759 env->ReleaseStringUTFChars(file, file8); 760 761 if (fd < 0) { 762 //LOGW("Unable to open process file: %s\n", file8); 763 return JNI_FALSE; 764 } 765 766 char buffer[256]; 767 const int len = read(fd, buffer, sizeof(buffer)-1); 768 close(fd); 769 770 if (len < 0) { 771 //LOGW("Unable to open process file: %s fd=%d\n", file8, fd); 772 return JNI_FALSE; 773 } 774 buffer[len] = 0; 775 776 return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len, 777 format, outStrings, outLongs, outFloats); 778 779} 780 781void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz, 782 jobject binderObject) 783{ 784 if (binderObject == NULL) { 785 jniThrowNullPointerException(env, NULL); 786 return; 787 } 788 789 sp<IBinder> binder = ibinderForJavaObject(env, binderObject); 790} 791 792void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig) 793{ 794 if (pid > 0) { 795 ALOGI("Sending signal. PID: %d SIG: %d", pid, sig); 796 kill(pid, sig); 797 } 798} 799 800void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig) 801{ 802 if (pid > 0) { 803 kill(pid, sig); 804 } 805} 806 807static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz) 808{ 809 struct timespec ts; 810 811 int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts); 812 813 if (res != 0) { 814 return (jlong) 0; 815 } 816 817 nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec; 818 return (jlong) nanoseconds_to_milliseconds(when); 819} 820 821static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid) 822{ 823 char filename[64]; 824 825 snprintf(filename, sizeof(filename), "/proc/%d/smaps", pid); 826 827 FILE * file = fopen(filename, "r"); 828 if (!file) { 829 return (jlong) -1; 830 } 831 832 // Tally up all of the Pss from the various maps 833 char line[256]; 834 jlong pss = 0; 835 while (fgets(line, sizeof(line), file)) { 836 jlong v; 837 if (sscanf(line, "Pss: %lld kB", &v) == 1) { 838 pss += v; 839 } 840 } 841 842 fclose(file); 843 844 // Return the Pss value in bytes, not kilobytes 845 return pss * 1024; 846} 847 848static const JNINativeMethod methods[] = { 849 {"myPid", "()I", (void*)android_os_Process_myPid}, 850 {"myTid", "()I", (void*)android_os_Process_myTid}, 851 {"myUid", "()I", (void*)android_os_Process_myUid}, 852 {"getUidForName", "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName}, 853 {"getGidForName", "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName}, 854 {"setThreadPriority", "(II)V", (void*)android_os_Process_setThreadPriority}, 855 {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground}, 856 {"setThreadPriority", "(I)V", (void*)android_os_Process_setCallingThreadPriority}, 857 {"getThreadPriority", "(I)I", (void*)android_os_Process_getThreadPriority}, 858 {"setThreadGroup", "(II)V", (void*)android_os_Process_setThreadGroup}, 859 {"setProcessGroup", "(II)V", (void*)android_os_Process_setProcessGroup}, 860 {"setOomAdj", "(II)Z", (void*)android_os_Process_setOomAdj}, 861 {"setArgV0", "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0}, 862 {"setUid", "(I)I", (void*)android_os_Process_setUid}, 863 {"setGid", "(I)I", (void*)android_os_Process_setGid}, 864 {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal}, 865 {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet}, 866 {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory}, 867 {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines}, 868 {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids}, 869 {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile}, 870 {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine}, 871 {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime}, 872 {"getPss", "(I)J", (void*)android_os_Process_getPss}, 873 //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject}, 874}; 875 876const char* const kProcessPathName = "android/os/Process"; 877 878int register_android_os_Process(JNIEnv* env) 879{ 880 return AndroidRuntime::registerNativeMethods( 881 env, kProcessPathName, 882 methods, NELEM(methods)); 883} 884