android_util_Process.cpp revision cc767191cfb675f744e0165608b0a4196aba2b37
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, 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, 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, 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, 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, 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 ALOGE("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, 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_setThreadScheduler(JNIEnv* env, jclass clazz, 268 jint tid, jint policy, jint pri) 269{ 270#ifdef HAVE_SCHED_SETSCHEDULER 271 struct sched_param param; 272 param.sched_priority = pri; 273 int rc = sched_setscheduler(tid, policy, ¶m); 274 if (rc) { 275 signalExceptionForPriorityError(env, errno); 276 } 277#else 278 signalExceptionForPriorityError(env, ENOSYS); 279#endif 280} 281 282void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz, 283 jint pid, jint pri) 284{ 285#if GUARD_THREAD_PRIORITY 286 // if we're putting the current thread into the background, check the TLS 287 // to make sure this thread isn't guarded. If it is, raise an exception. 288 if (pri >= ANDROID_PRIORITY_BACKGROUND) { 289 if (pid == androidGetTid()) { 290 void* bgOk = pthread_getspecific(gBgKey); 291 if (bgOk == ((void*)0xbaad)) { 292 ALOGE("Thread marked fg-only put self in background!"); 293 jniThrowException(env, "java/lang/SecurityException", "May not put this thread into background"); 294 return; 295 } 296 } 297 } 298#endif 299 300 int rc = androidSetThreadPriority(pid, pri); 301 if (rc != 0) { 302 if (rc == INVALID_OPERATION) { 303 signalExceptionForPriorityError(env, errno); 304 } else { 305 signalExceptionForGroupError(env, errno); 306 } 307 } 308 309 //ALOGI("Setting priority of %d: %d, getpriority returns %d\n", 310 // pid, pri, getpriority(PRIO_PROCESS, pid)); 311} 312 313void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz, 314 jint pri) 315{ 316 jint tid = android_os_Process_myTid(env, clazz); 317 android_os_Process_setThreadPriority(env, clazz, tid, pri); 318} 319 320jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz, 321 jint pid) 322{ 323 errno = 0; 324 jint pri = getpriority(PRIO_PROCESS, pid); 325 if (errno != 0) { 326 signalExceptionForPriorityError(env, errno); 327 } 328 //ALOGI("Returning priority of %d: %d\n", pid, pri); 329 return pri; 330} 331 332jboolean android_os_Process_setOomAdj(JNIEnv* env, jobject clazz, 333 jint pid, jint adj) 334{ 335#ifdef HAVE_OOM_ADJ 336 char text[64]; 337 sprintf(text, "/proc/%d/oom_adj", pid); 338 int fd = open(text, O_WRONLY); 339 if (fd >= 0) { 340 sprintf(text, "%d", adj); 341 write(fd, text, strlen(text)); 342 close(fd); 343 } 344 return true; 345#endif 346 return false; 347} 348 349void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name) 350{ 351 if (name == NULL) { 352 jniThrowNullPointerException(env, NULL); 353 return; 354 } 355 356 const jchar* str = env->GetStringCritical(name, 0); 357 String8 name8; 358 if (str) { 359 name8 = String8(str, env->GetStringLength(name)); 360 env->ReleaseStringCritical(name, str); 361 } 362 363 if (name8.size() > 0) { 364 ProcessState::self()->setArgV0(name8.string()); 365 } 366} 367 368jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid) 369{ 370 return setuid(uid) == 0 ? 0 : errno; 371} 372 373jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid) 374{ 375 return setgid(uid) == 0 ? 0 : errno; 376} 377 378static int pid_compare(const void* v1, const void* v2) 379{ 380 //ALOGI("Compare %d vs %d\n", *((const jint*)v1), *((const jint*)v2)); 381 return *((const jint*)v1) - *((const jint*)v2); 382} 383 384static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz) 385{ 386 int fd = open("/proc/meminfo", O_RDONLY); 387 388 if (fd < 0) { 389 ALOGW("Unable to open /proc/meminfo"); 390 return -1; 391 } 392 393 char buffer[256]; 394 const int len = read(fd, buffer, sizeof(buffer)-1); 395 close(fd); 396 397 if (len < 0) { 398 ALOGW("Unable to read /proc/meminfo"); 399 return -1; 400 } 401 buffer[len] = 0; 402 403 int numFound = 0; 404 jlong mem = 0; 405 406 static const char* const sums[] = { "MemFree:", "Cached:", NULL }; 407 static const int sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), 0 }; 408 409 char* p = buffer; 410 while (*p && numFound < 2) { 411 int i = 0; 412 while (sums[i]) { 413 if (strncmp(p, sums[i], sumsLen[i]) == 0) { 414 p += sumsLen[i]; 415 while (*p == ' ') p++; 416 char* num = p; 417 while (*p >= '0' && *p <= '9') p++; 418 if (*p != 0) { 419 *p = 0; 420 p++; 421 if (*p == 0) p--; 422 } 423 mem += atoll(num) * 1024; 424 numFound++; 425 break; 426 } 427 i++; 428 } 429 p++; 430 } 431 432 return numFound > 0 ? mem : -1; 433} 434 435void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr, 436 jobjectArray reqFields, jlongArray outFields) 437{ 438 //ALOGI("getMemInfo: %p %p", reqFields, outFields); 439 440 if (fileStr == NULL || reqFields == NULL || outFields == NULL) { 441 jniThrowNullPointerException(env, NULL); 442 return; 443 } 444 445 const char* file8 = env->GetStringUTFChars(fileStr, NULL); 446 if (file8 == NULL) { 447 return; 448 } 449 String8 file(file8); 450 env->ReleaseStringUTFChars(fileStr, file8); 451 452 jsize count = env->GetArrayLength(reqFields); 453 if (count > env->GetArrayLength(outFields)) { 454 jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ"); 455 return; 456 } 457 458 Vector<String8> fields; 459 int i; 460 461 for (i=0; i<count; i++) { 462 jobject obj = env->GetObjectArrayElement(reqFields, i); 463 if (obj != NULL) { 464 const char* str8 = env->GetStringUTFChars((jstring)obj, NULL); 465 //ALOGI("String at %d: %p = %s", i, obj, str8); 466 if (str8 == NULL) { 467 jniThrowNullPointerException(env, "Element in reqFields"); 468 return; 469 } 470 fields.add(String8(str8)); 471 env->ReleaseStringUTFChars((jstring)obj, str8); 472 } else { 473 jniThrowNullPointerException(env, "Element in reqFields"); 474 return; 475 } 476 } 477 478 jlong* sizesArray = env->GetLongArrayElements(outFields, 0); 479 if (sizesArray == NULL) { 480 return; 481 } 482 483 //ALOGI("Clearing %d sizes", count); 484 for (i=0; i<count; i++) { 485 sizesArray[i] = 0; 486 } 487 488 int fd = open(file.string(), O_RDONLY); 489 490 if (fd >= 0) { 491 const size_t BUFFER_SIZE = 2048; 492 char* buffer = (char*)malloc(BUFFER_SIZE); 493 int len = read(fd, buffer, BUFFER_SIZE-1); 494 close(fd); 495 496 if (len < 0) { 497 ALOGW("Unable to read %s", file.string()); 498 len = 0; 499 } 500 buffer[len] = 0; 501 502 int foundCount = 0; 503 504 char* p = buffer; 505 while (*p && foundCount < count) { 506 bool skipToEol = true; 507 //ALOGI("Parsing at: %s", p); 508 for (i=0; i<count; i++) { 509 const String8& field = fields[i]; 510 if (strncmp(p, field.string(), field.length()) == 0) { 511 p += field.length(); 512 while (*p == ' ' || *p == '\t') p++; 513 char* num = p; 514 while (*p >= '0' && *p <= '9') p++; 515 skipToEol = *p != '\n'; 516 if (*p != 0) { 517 *p = 0; 518 p++; 519 } 520 char* end; 521 sizesArray[i] = strtoll(num, &end, 10); 522 //ALOGI("Field %s = %d", field.string(), sizesArray[i]); 523 foundCount++; 524 break; 525 } 526 } 527 if (skipToEol) { 528 while (*p && *p != '\n') { 529 p++; 530 } 531 if (*p == '\n') { 532 p++; 533 } 534 } 535 } 536 537 free(buffer); 538 } else { 539 ALOGW("Unable to open %s", file.string()); 540 } 541 542 //ALOGI("Done!"); 543 env->ReleaseLongArrayElements(outFields, sizesArray, 0); 544} 545 546jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz, 547 jstring file, jintArray lastArray) 548{ 549 if (file == NULL) { 550 jniThrowNullPointerException(env, NULL); 551 return NULL; 552 } 553 554 const char* file8 = env->GetStringUTFChars(file, NULL); 555 if (file8 == NULL) { 556 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 557 return NULL; 558 } 559 560 DIR* dirp = opendir(file8); 561 562 env->ReleaseStringUTFChars(file, file8); 563 564 if(dirp == NULL) { 565 return NULL; 566 } 567 568 jsize curCount = 0; 569 jint* curData = NULL; 570 if (lastArray != NULL) { 571 curCount = env->GetArrayLength(lastArray); 572 curData = env->GetIntArrayElements(lastArray, 0); 573 } 574 575 jint curPos = 0; 576 577 struct dirent* entry; 578 while ((entry=readdir(dirp)) != NULL) { 579 const char* p = entry->d_name; 580 while (*p) { 581 if (*p < '0' || *p > '9') break; 582 p++; 583 } 584 if (*p != 0) continue; 585 586 char* end; 587 int pid = strtol(entry->d_name, &end, 10); 588 //ALOGI("File %s pid=%d\n", entry->d_name, pid); 589 if (curPos >= curCount) { 590 jsize newCount = (curCount == 0) ? 10 : (curCount*2); 591 jintArray newArray = env->NewIntArray(newCount); 592 if (newArray == NULL) { 593 closedir(dirp); 594 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 595 return NULL; 596 } 597 jint* newData = env->GetIntArrayElements(newArray, 0); 598 if (curData != NULL) { 599 memcpy(newData, curData, sizeof(jint)*curCount); 600 env->ReleaseIntArrayElements(lastArray, curData, 0); 601 } 602 lastArray = newArray; 603 curCount = newCount; 604 curData = newData; 605 } 606 607 curData[curPos] = pid; 608 curPos++; 609 } 610 611 closedir(dirp); 612 613 if (curData != NULL && curPos > 0) { 614 qsort(curData, curPos, sizeof(jint), pid_compare); 615 } 616 617 while (curPos < curCount) { 618 curData[curPos] = -1; 619 curPos++; 620 } 621 622 if (curData != NULL) { 623 env->ReleaseIntArrayElements(lastArray, curData, 0); 624 } 625 626 return lastArray; 627} 628 629enum { 630 PROC_TERM_MASK = 0xff, 631 PROC_ZERO_TERM = 0, 632 PROC_SPACE_TERM = ' ', 633 PROC_COMBINE = 0x100, 634 PROC_PARENS = 0x200, 635 PROC_OUT_STRING = 0x1000, 636 PROC_OUT_LONG = 0x2000, 637 PROC_OUT_FLOAT = 0x4000, 638}; 639 640jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz, 641 char* buffer, jint startIndex, jint endIndex, jintArray format, 642 jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats) 643{ 644 645 const jsize NF = env->GetArrayLength(format); 646 const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0; 647 const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0; 648 const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0; 649 650 jint* formatData = env->GetIntArrayElements(format, 0); 651 jlong* longsData = outLongs ? 652 env->GetLongArrayElements(outLongs, 0) : NULL; 653 jfloat* floatsData = outFloats ? 654 env->GetFloatArrayElements(outFloats, 0) : NULL; 655 if (formatData == NULL || (NL > 0 && longsData == NULL) 656 || (NR > 0 && floatsData == NULL)) { 657 if (formatData != NULL) { 658 env->ReleaseIntArrayElements(format, formatData, 0); 659 } 660 if (longsData != NULL) { 661 env->ReleaseLongArrayElements(outLongs, longsData, 0); 662 } 663 if (floatsData != NULL) { 664 env->ReleaseFloatArrayElements(outFloats, floatsData, 0); 665 } 666 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 667 return JNI_FALSE; 668 } 669 670 jsize i = startIndex; 671 jsize di = 0; 672 673 jboolean res = JNI_TRUE; 674 675 for (jsize fi=0; fi<NF; fi++) { 676 const jint mode = formatData[fi]; 677 if ((mode&PROC_PARENS) != 0) { 678 i++; 679 } 680 const char term = (char)(mode&PROC_TERM_MASK); 681 const jsize start = i; 682 if (i >= endIndex) { 683 res = JNI_FALSE; 684 break; 685 } 686 687 jsize end = -1; 688 if ((mode&PROC_PARENS) != 0) { 689 while (buffer[i] != ')' && i < endIndex) { 690 i++; 691 } 692 end = i; 693 i++; 694 } 695 while (buffer[i] != term && i < endIndex) { 696 i++; 697 } 698 if (end < 0) { 699 end = i; 700 } 701 702 if (i < endIndex) { 703 i++; 704 if ((mode&PROC_COMBINE) != 0) { 705 while (buffer[i] == term && i < endIndex) { 706 i++; 707 } 708 } 709 } 710 711 //ALOGI("Field %d: %d-%d dest=%d mode=0x%x\n", i, start, end, di, mode); 712 713 if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) { 714 char c = buffer[end]; 715 buffer[end] = 0; 716 if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) { 717 char* end; 718 floatsData[di] = strtof(buffer+start, &end); 719 } 720 if ((mode&PROC_OUT_LONG) != 0 && di < NL) { 721 char* end; 722 longsData[di] = strtoll(buffer+start, &end, 10); 723 } 724 if ((mode&PROC_OUT_STRING) != 0 && di < NS) { 725 jstring str = env->NewStringUTF(buffer+start); 726 env->SetObjectArrayElement(outStrings, di, str); 727 } 728 buffer[end] = c; 729 di++; 730 } 731 } 732 733 env->ReleaseIntArrayElements(format, formatData, 0); 734 if (longsData != NULL) { 735 env->ReleaseLongArrayElements(outLongs, longsData, 0); 736 } 737 if (floatsData != NULL) { 738 env->ReleaseFloatArrayElements(outFloats, floatsData, 0); 739 } 740 741 return res; 742} 743 744jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz, 745 jbyteArray buffer, jint startIndex, jint endIndex, jintArray format, 746 jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats) 747{ 748 jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL); 749 750 jboolean result = android_os_Process_parseProcLineArray(env, clazz, 751 (char*) bufferArray, startIndex, endIndex, format, outStrings, 752 outLongs, outFloats); 753 754 env->ReleaseByteArrayElements(buffer, bufferArray, 0); 755 756 return result; 757} 758 759jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz, 760 jstring file, jintArray format, jobjectArray outStrings, 761 jlongArray outLongs, jfloatArray outFloats) 762{ 763 if (file == NULL || format == NULL) { 764 jniThrowNullPointerException(env, NULL); 765 return JNI_FALSE; 766 } 767 768 const char* file8 = env->GetStringUTFChars(file, NULL); 769 if (file8 == NULL) { 770 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 771 return JNI_FALSE; 772 } 773 int fd = open(file8, O_RDONLY); 774 env->ReleaseStringUTFChars(file, file8); 775 776 if (fd < 0) { 777 //ALOGW("Unable to open process file: %s\n", file8); 778 return JNI_FALSE; 779 } 780 781 char buffer[256]; 782 const int len = read(fd, buffer, sizeof(buffer)-1); 783 close(fd); 784 785 if (len < 0) { 786 //ALOGW("Unable to open process file: %s fd=%d\n", file8, fd); 787 return JNI_FALSE; 788 } 789 buffer[len] = 0; 790 791 return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len, 792 format, outStrings, outLongs, outFloats); 793 794} 795 796void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz, 797 jobject binderObject) 798{ 799 if (binderObject == NULL) { 800 jniThrowNullPointerException(env, NULL); 801 return; 802 } 803 804 sp<IBinder> binder = ibinderForJavaObject(env, binderObject); 805} 806 807void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig) 808{ 809 if (pid > 0) { 810 ALOGI("Sending signal. PID: %d SIG: %d", pid, sig); 811 kill(pid, sig); 812 } 813} 814 815void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig) 816{ 817 if (pid > 0) { 818 kill(pid, sig); 819 } 820} 821 822static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz) 823{ 824 struct timespec ts; 825 826 int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts); 827 828 if (res != 0) { 829 return (jlong) 0; 830 } 831 832 nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec; 833 return (jlong) nanoseconds_to_milliseconds(when); 834} 835 836static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid) 837{ 838 char filename[64]; 839 840 snprintf(filename, sizeof(filename), "/proc/%d/smaps", pid); 841 842 FILE * file = fopen(filename, "r"); 843 if (!file) { 844 return (jlong) -1; 845 } 846 847 // Tally up all of the Pss from the various maps 848 char line[256]; 849 jlong pss = 0; 850 while (fgets(line, sizeof(line), file)) { 851 jlong v; 852 if (sscanf(line, "Pss: %lld kB", &v) == 1) { 853 pss += v; 854 } 855 } 856 857 fclose(file); 858 859 // Return the Pss value in bytes, not kilobytes 860 return pss * 1024; 861} 862 863static const JNINativeMethod methods[] = { 864 {"myPid", "()I", (void*)android_os_Process_myPid}, 865 {"myTid", "()I", (void*)android_os_Process_myTid}, 866 {"myUid", "()I", (void*)android_os_Process_myUid}, 867 {"getUidForName", "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName}, 868 {"getGidForName", "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName}, 869 {"setThreadPriority", "(II)V", (void*)android_os_Process_setThreadPriority}, 870 {"setThreadScheduler", "(III)V", (void*)android_os_Process_setThreadScheduler}, 871 {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground}, 872 {"setThreadPriority", "(I)V", (void*)android_os_Process_setCallingThreadPriority}, 873 {"getThreadPriority", "(I)I", (void*)android_os_Process_getThreadPriority}, 874 {"setThreadGroup", "(II)V", (void*)android_os_Process_setThreadGroup}, 875 {"setProcessGroup", "(II)V", (void*)android_os_Process_setProcessGroup}, 876 {"setOomAdj", "(II)Z", (void*)android_os_Process_setOomAdj}, 877 {"setArgV0", "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0}, 878 {"setUid", "(I)I", (void*)android_os_Process_setUid}, 879 {"setGid", "(I)I", (void*)android_os_Process_setGid}, 880 {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal}, 881 {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet}, 882 {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory}, 883 {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines}, 884 {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids}, 885 {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile}, 886 {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine}, 887 {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime}, 888 {"getPss", "(I)J", (void*)android_os_Process_getPss}, 889 //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject}, 890}; 891 892const char* const kProcessPathName = "android/os/Process"; 893 894int register_android_os_Process(JNIEnv* env) 895{ 896 return AndroidRuntime::registerNativeMethods( 897 env, kProcessPathName, 898 methods, NELEM(methods)); 899} 900