android_util_Process.cpp revision 6d4b1e24aef5b74b40de4d8f6e63c21874ce8e3a
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 46using namespace android; 47 48#if GUARD_THREAD_PRIORITY 49Mutex gKeyCreateMutex; 50static 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 55static 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 76static 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 97jint android_os_Process_getUidForName(JNIEnv* env, jobject clazz, jstring name) 98{ 99 if (name == NULL) { 100 jniThrowNullPointerException(env, NULL); 101 return -1; 102 } 103 104 const jchar* str16 = env->GetStringCritical(name, 0); 105 String8 name8; 106 if (str16) { 107 name8 = String8(str16, env->GetStringLength(name)); 108 env->ReleaseStringCritical(name, str16); 109 } 110 111 const size_t N = name8.size(); 112 if (N > 0) { 113 const char* str = name8.string(); 114 for (size_t i=0; i<N; i++) { 115 if (str[i] < '0' || str[i] > '9') { 116 struct passwd* pwd = getpwnam(str); 117 if (pwd == NULL) { 118 return -1; 119 } 120 return pwd->pw_uid; 121 } 122 } 123 return atoi(str); 124 } 125 return -1; 126} 127 128jint android_os_Process_getGidForName(JNIEnv* env, jobject clazz, jstring name) 129{ 130 if (name == NULL) { 131 jniThrowNullPointerException(env, NULL); 132 return -1; 133 } 134 135 const jchar* str16 = env->GetStringCritical(name, 0); 136 String8 name8; 137 if (str16) { 138 name8 = String8(str16, env->GetStringLength(name)); 139 env->ReleaseStringCritical(name, str16); 140 } 141 142 const size_t N = name8.size(); 143 if (N > 0) { 144 const char* str = name8.string(); 145 for (size_t i=0; i<N; i++) { 146 if (str[i] < '0' || str[i] > '9') { 147 struct group* grp = getgrnam(str); 148 if (grp == NULL) { 149 return -1; 150 } 151 return grp->gr_gid; 152 } 153 } 154 return atoi(str); 155 } 156 return -1; 157} 158 159void android_os_Process_setThreadGroup(JNIEnv* env, jobject clazz, int tid, jint grp) 160{ 161 ALOGV("%s tid=%d grp=%d", __func__, tid, grp); 162 SchedPolicy sp = (SchedPolicy) grp; 163 int res = set_sched_policy(tid, sp); 164 if (res != NO_ERROR) { 165 signalExceptionForGroupError(env, -res); 166 } 167} 168 169void android_os_Process_setProcessGroup(JNIEnv* env, jobject clazz, int pid, jint grp) 170{ 171 ALOGV("%s pid=%d grp=%d", __func__, pid, grp); 172 DIR *d; 173 FILE *fp; 174 char proc_path[255]; 175 struct dirent *de; 176 177 if ((grp == SP_FOREGROUND) || (grp > SP_MAX)) { 178 signalExceptionForGroupError(env, EINVAL); 179 return; 180 } 181 182 bool isDefault = false; 183 if (grp < 0) { 184 grp = SP_FOREGROUND; 185 isDefault = true; 186 } 187 SchedPolicy sp = (SchedPolicy) grp; 188 189#if POLICY_DEBUG 190 char cmdline[32]; 191 int fd; 192 193 strcpy(cmdline, "unknown"); 194 195 sprintf(proc_path, "/proc/%d/cmdline", pid); 196 fd = open(proc_path, O_RDONLY); 197 if (fd >= 0) { 198 int rc = read(fd, cmdline, sizeof(cmdline)-1); 199 cmdline[rc] = 0; 200 close(fd); 201 } 202 203 if (sp == SP_BACKGROUND) { 204 ALOGD("setProcessGroup: vvv pid %d (%s)", pid, cmdline); 205 } else { 206 ALOGD("setProcessGroup: ^^^ pid %d (%s)", pid, cmdline); 207 } 208#endif 209 sprintf(proc_path, "/proc/%d/task", pid); 210 if (!(d = opendir(proc_path))) { 211 // If the process exited on us, don't generate an exception 212 if (errno != ENOENT) 213 signalExceptionForGroupError(env, errno); 214 return; 215 } 216 217 while ((de = readdir(d))) { 218 int t_pid; 219 int t_pri; 220 221 if (de->d_name[0] == '.') 222 continue; 223 t_pid = atoi(de->d_name); 224 225 if (!t_pid) { 226 ALOGE("Error getting pid for '%s'\n", de->d_name); 227 continue; 228 } 229 230 t_pri = getpriority(PRIO_PROCESS, t_pid); 231 232 if (t_pri <= ANDROID_PRIORITY_AUDIO) { 233 int scheduler = sched_getscheduler(t_pid); 234 if ((scheduler == SCHED_FIFO) || (scheduler == SCHED_RR)) { 235 // This task wants to stay in it's current audio group so it can keep it's budget 236 continue; 237 } 238 } 239 240 if (isDefault) { 241 if (t_pri >= ANDROID_PRIORITY_BACKGROUND) { 242 // This task wants to stay at background 243 continue; 244 } 245 } 246 247 int err = set_sched_policy(t_pid, sp); 248 if (err != NO_ERROR) { 249 signalExceptionForGroupError(env, -err); 250 break; 251 } 252 } 253 closedir(d); 254} 255 256jint android_os_Process_getProcessGroup(JNIEnv* env, jobject clazz, jint pid) 257{ 258 SchedPolicy sp; 259 if (get_sched_policy(pid, &sp) != 0) { 260 signalExceptionForGroupError(env, errno); 261 } 262 return (int) sp; 263} 264 265static void android_os_Process_setCanSelfBackground(JNIEnv* env, jobject clazz, jboolean bgOk) { 266 // Establishes the calling thread as illegal to put into the background. 267 // Typically used only for the system process's main looper. 268#if GUARD_THREAD_PRIORITY 269 ALOGV("Process.setCanSelfBackground(%d) : tid=%d", bgOk, androidGetTid()); 270 { 271 Mutex::Autolock _l(gKeyCreateMutex); 272 if (gBgKey == -1) { 273 pthread_key_create(&gBgKey, NULL); 274 } 275 } 276 277 // inverted: not-okay, we set a sentinel value 278 pthread_setspecific(gBgKey, (void*)(bgOk ? 0 : 0xbaad)); 279#endif 280} 281 282void android_os_Process_setThreadScheduler(JNIEnv* env, jclass clazz, 283 jint tid, jint policy, jint pri) 284{ 285#ifdef HAVE_SCHED_SETSCHEDULER 286 struct sched_param param; 287 param.sched_priority = pri; 288 int rc = sched_setscheduler(tid, policy, ¶m); 289 if (rc) { 290 signalExceptionForPriorityError(env, errno); 291 } 292#else 293 signalExceptionForPriorityError(env, ENOSYS); 294#endif 295} 296 297void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz, 298 jint pid, jint pri) 299{ 300#if GUARD_THREAD_PRIORITY 301 // if we're putting the current thread into the background, check the TLS 302 // to make sure this thread isn't guarded. If it is, raise an exception. 303 if (pri >= ANDROID_PRIORITY_BACKGROUND) { 304 if (pid == androidGetTid()) { 305 void* bgOk = pthread_getspecific(gBgKey); 306 if (bgOk == ((void*)0xbaad)) { 307 ALOGE("Thread marked fg-only put self in background!"); 308 jniThrowException(env, "java/lang/SecurityException", "May not put this thread into background"); 309 return; 310 } 311 } 312 } 313#endif 314 315 int rc = androidSetThreadPriority(pid, pri); 316 if (rc != 0) { 317 if (rc == INVALID_OPERATION) { 318 signalExceptionForPriorityError(env, errno); 319 } else { 320 signalExceptionForGroupError(env, errno); 321 } 322 } 323 324 //ALOGI("Setting priority of %d: %d, getpriority returns %d\n", 325 // pid, pri, getpriority(PRIO_PROCESS, pid)); 326} 327 328void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz, 329 jint pri) 330{ 331 android_os_Process_setThreadPriority(env, clazz, androidGetTid(), pri); 332} 333 334jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz, 335 jint pid) 336{ 337 errno = 0; 338 jint pri = getpriority(PRIO_PROCESS, pid); 339 if (errno != 0) { 340 signalExceptionForPriorityError(env, errno); 341 } 342 //ALOGI("Returning priority of %d: %d\n", pid, pri); 343 return pri; 344} 345 346jboolean android_os_Process_setOomAdj(JNIEnv* env, jobject clazz, 347 jint pid, jint adj) 348{ 349#ifdef HAVE_OOM_ADJ 350 char text[64]; 351 sprintf(text, "/proc/%d/oom_adj", pid); 352 int fd = open(text, O_WRONLY); 353 if (fd >= 0) { 354 sprintf(text, "%d", adj); 355 write(fd, text, strlen(text)); 356 close(fd); 357 } 358 return true; 359#endif 360 return false; 361} 362 363void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name) 364{ 365 if (name == NULL) { 366 jniThrowNullPointerException(env, NULL); 367 return; 368 } 369 370 const jchar* str = env->GetStringCritical(name, 0); 371 String8 name8; 372 if (str) { 373 name8 = String8(str, env->GetStringLength(name)); 374 env->ReleaseStringCritical(name, str); 375 } 376 377 if (name8.size() > 0) { 378 ProcessState::self()->setArgV0(name8.string()); 379 } 380} 381 382jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid) 383{ 384 return setuid(uid) == 0 ? 0 : errno; 385} 386 387jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid) 388{ 389 return setgid(uid) == 0 ? 0 : errno; 390} 391 392static int pid_compare(const void* v1, const void* v2) 393{ 394 //ALOGI("Compare %d vs %d\n", *((const jint*)v1), *((const jint*)v2)); 395 return *((const jint*)v1) - *((const jint*)v2); 396} 397 398static jlong getFreeMemoryImpl(const char* const sums[], const int sumsLen[], int num) 399{ 400 int fd = open("/proc/meminfo", O_RDONLY); 401 402 if (fd < 0) { 403 ALOGW("Unable to open /proc/meminfo"); 404 return -1; 405 } 406 407 char buffer[256]; 408 const int len = read(fd, buffer, sizeof(buffer)-1); 409 close(fd); 410 411 if (len < 0) { 412 ALOGW("Unable to read /proc/meminfo"); 413 return -1; 414 } 415 buffer[len] = 0; 416 417 int numFound = 0; 418 jlong mem = 0; 419 420 char* p = buffer; 421 while (*p && numFound < num) { 422 int i = 0; 423 while (sums[i]) { 424 if (strncmp(p, sums[i], sumsLen[i]) == 0) { 425 p += sumsLen[i]; 426 while (*p == ' ') p++; 427 char* num = p; 428 while (*p >= '0' && *p <= '9') p++; 429 if (*p != 0) { 430 *p = 0; 431 p++; 432 if (*p == 0) p--; 433 } 434 mem += atoll(num) * 1024; 435 numFound++; 436 break; 437 } 438 i++; 439 } 440 p++; 441 } 442 443 return numFound > 0 ? mem : -1; 444} 445 446static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz) 447{ 448 static const char* const sums[] = { "MemFree:", "Cached:", NULL }; 449 static const int sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), 0 }; 450 return getFreeMemoryImpl(sums, sumsLen, 2); 451} 452 453static jlong android_os_Process_getTotalMemory(JNIEnv* env, jobject clazz) 454{ 455 static const char* const sums[] = { "MemTotal:", NULL }; 456 static const int sumsLen[] = { strlen("MemTotal:"), 0 }; 457 return getFreeMemoryImpl(sums, sumsLen, 1); 458} 459 460void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr, 461 jobjectArray reqFields, jlongArray outFields) 462{ 463 //ALOGI("getMemInfo: %p %p", reqFields, outFields); 464 465 if (fileStr == NULL || reqFields == NULL || outFields == NULL) { 466 jniThrowNullPointerException(env, NULL); 467 return; 468 } 469 470 const char* file8 = env->GetStringUTFChars(fileStr, NULL); 471 if (file8 == NULL) { 472 return; 473 } 474 String8 file(file8); 475 env->ReleaseStringUTFChars(fileStr, file8); 476 477 jsize count = env->GetArrayLength(reqFields); 478 if (count > env->GetArrayLength(outFields)) { 479 jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ"); 480 return; 481 } 482 483 Vector<String8> fields; 484 int i; 485 486 for (i=0; i<count; i++) { 487 jobject obj = env->GetObjectArrayElement(reqFields, i); 488 if (obj != NULL) { 489 const char* str8 = env->GetStringUTFChars((jstring)obj, NULL); 490 //ALOGI("String at %d: %p = %s", i, obj, str8); 491 if (str8 == NULL) { 492 jniThrowNullPointerException(env, "Element in reqFields"); 493 return; 494 } 495 fields.add(String8(str8)); 496 env->ReleaseStringUTFChars((jstring)obj, str8); 497 } else { 498 jniThrowNullPointerException(env, "Element in reqFields"); 499 return; 500 } 501 } 502 503 jlong* sizesArray = env->GetLongArrayElements(outFields, 0); 504 if (sizesArray == NULL) { 505 return; 506 } 507 508 //ALOGI("Clearing %d sizes", count); 509 for (i=0; i<count; i++) { 510 sizesArray[i] = 0; 511 } 512 513 int fd = open(file.string(), O_RDONLY); 514 515 if (fd >= 0) { 516 const size_t BUFFER_SIZE = 2048; 517 char* buffer = (char*)malloc(BUFFER_SIZE); 518 int len = read(fd, buffer, BUFFER_SIZE-1); 519 close(fd); 520 521 if (len < 0) { 522 ALOGW("Unable to read %s", file.string()); 523 len = 0; 524 } 525 buffer[len] = 0; 526 527 int foundCount = 0; 528 529 char* p = buffer; 530 while (*p && foundCount < count) { 531 bool skipToEol = true; 532 //ALOGI("Parsing at: %s", p); 533 for (i=0; i<count; i++) { 534 const String8& field = fields[i]; 535 if (strncmp(p, field.string(), field.length()) == 0) { 536 p += field.length(); 537 while (*p == ' ' || *p == '\t') p++; 538 char* num = p; 539 while (*p >= '0' && *p <= '9') p++; 540 skipToEol = *p != '\n'; 541 if (*p != 0) { 542 *p = 0; 543 p++; 544 } 545 char* end; 546 sizesArray[i] = strtoll(num, &end, 10); 547 //ALOGI("Field %s = %d", field.string(), sizesArray[i]); 548 foundCount++; 549 break; 550 } 551 } 552 if (skipToEol) { 553 while (*p && *p != '\n') { 554 p++; 555 } 556 if (*p == '\n') { 557 p++; 558 } 559 } 560 } 561 562 free(buffer); 563 } else { 564 ALOGW("Unable to open %s", file.string()); 565 } 566 567 //ALOGI("Done!"); 568 env->ReleaseLongArrayElements(outFields, sizesArray, 0); 569} 570 571jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz, 572 jstring file, jintArray lastArray) 573{ 574 if (file == NULL) { 575 jniThrowNullPointerException(env, NULL); 576 return NULL; 577 } 578 579 const char* file8 = env->GetStringUTFChars(file, NULL); 580 if (file8 == NULL) { 581 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 582 return NULL; 583 } 584 585 DIR* dirp = opendir(file8); 586 587 env->ReleaseStringUTFChars(file, file8); 588 589 if(dirp == NULL) { 590 return NULL; 591 } 592 593 jsize curCount = 0; 594 jint* curData = NULL; 595 if (lastArray != NULL) { 596 curCount = env->GetArrayLength(lastArray); 597 curData = env->GetIntArrayElements(lastArray, 0); 598 } 599 600 jint curPos = 0; 601 602 struct dirent* entry; 603 while ((entry=readdir(dirp)) != NULL) { 604 const char* p = entry->d_name; 605 while (*p) { 606 if (*p < '0' || *p > '9') break; 607 p++; 608 } 609 if (*p != 0) continue; 610 611 char* end; 612 int pid = strtol(entry->d_name, &end, 10); 613 //ALOGI("File %s pid=%d\n", entry->d_name, pid); 614 if (curPos >= curCount) { 615 jsize newCount = (curCount == 0) ? 10 : (curCount*2); 616 jintArray newArray = env->NewIntArray(newCount); 617 if (newArray == NULL) { 618 closedir(dirp); 619 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 620 return NULL; 621 } 622 jint* newData = env->GetIntArrayElements(newArray, 0); 623 if (curData != NULL) { 624 memcpy(newData, curData, sizeof(jint)*curCount); 625 env->ReleaseIntArrayElements(lastArray, curData, 0); 626 } 627 lastArray = newArray; 628 curCount = newCount; 629 curData = newData; 630 } 631 632 curData[curPos] = pid; 633 curPos++; 634 } 635 636 closedir(dirp); 637 638 if (curData != NULL && curPos > 0) { 639 qsort(curData, curPos, sizeof(jint), pid_compare); 640 } 641 642 while (curPos < curCount) { 643 curData[curPos] = -1; 644 curPos++; 645 } 646 647 if (curData != NULL) { 648 env->ReleaseIntArrayElements(lastArray, curData, 0); 649 } 650 651 return lastArray; 652} 653 654enum { 655 PROC_TERM_MASK = 0xff, 656 PROC_ZERO_TERM = 0, 657 PROC_SPACE_TERM = ' ', 658 PROC_COMBINE = 0x100, 659 PROC_PARENS = 0x200, 660 PROC_OUT_STRING = 0x1000, 661 PROC_OUT_LONG = 0x2000, 662 PROC_OUT_FLOAT = 0x4000, 663}; 664 665jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz, 666 char* buffer, jint startIndex, jint endIndex, jintArray format, 667 jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats) 668{ 669 670 const jsize NF = env->GetArrayLength(format); 671 const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0; 672 const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0; 673 const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0; 674 675 jint* formatData = env->GetIntArrayElements(format, 0); 676 jlong* longsData = outLongs ? 677 env->GetLongArrayElements(outLongs, 0) : NULL; 678 jfloat* floatsData = outFloats ? 679 env->GetFloatArrayElements(outFloats, 0) : NULL; 680 if (formatData == NULL || (NL > 0 && longsData == NULL) 681 || (NR > 0 && floatsData == NULL)) { 682 if (formatData != NULL) { 683 env->ReleaseIntArrayElements(format, formatData, 0); 684 } 685 if (longsData != NULL) { 686 env->ReleaseLongArrayElements(outLongs, longsData, 0); 687 } 688 if (floatsData != NULL) { 689 env->ReleaseFloatArrayElements(outFloats, floatsData, 0); 690 } 691 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 692 return JNI_FALSE; 693 } 694 695 jsize i = startIndex; 696 jsize di = 0; 697 698 jboolean res = JNI_TRUE; 699 700 for (jsize fi=0; fi<NF; fi++) { 701 const jint mode = formatData[fi]; 702 if ((mode&PROC_PARENS) != 0) { 703 i++; 704 } 705 const char term = (char)(mode&PROC_TERM_MASK); 706 const jsize start = i; 707 if (i >= endIndex) { 708 res = JNI_FALSE; 709 break; 710 } 711 712 jsize end = -1; 713 if ((mode&PROC_PARENS) != 0) { 714 while (buffer[i] != ')' && i < endIndex) { 715 i++; 716 } 717 end = i; 718 i++; 719 } 720 while (buffer[i] != term && i < endIndex) { 721 i++; 722 } 723 if (end < 0) { 724 end = i; 725 } 726 727 if (i < endIndex) { 728 i++; 729 if ((mode&PROC_COMBINE) != 0) { 730 while (buffer[i] == term && i < endIndex) { 731 i++; 732 } 733 } 734 } 735 736 //ALOGI("Field %d: %d-%d dest=%d mode=0x%x\n", i, start, end, di, mode); 737 738 if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) { 739 char c = buffer[end]; 740 buffer[end] = 0; 741 if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) { 742 char* end; 743 floatsData[di] = strtof(buffer+start, &end); 744 } 745 if ((mode&PROC_OUT_LONG) != 0 && di < NL) { 746 char* end; 747 longsData[di] = strtoll(buffer+start, &end, 10); 748 } 749 if ((mode&PROC_OUT_STRING) != 0 && di < NS) { 750 jstring str = env->NewStringUTF(buffer+start); 751 env->SetObjectArrayElement(outStrings, di, str); 752 } 753 buffer[end] = c; 754 di++; 755 } 756 } 757 758 env->ReleaseIntArrayElements(format, formatData, 0); 759 if (longsData != NULL) { 760 env->ReleaseLongArrayElements(outLongs, longsData, 0); 761 } 762 if (floatsData != NULL) { 763 env->ReleaseFloatArrayElements(outFloats, floatsData, 0); 764 } 765 766 return res; 767} 768 769jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz, 770 jbyteArray buffer, jint startIndex, jint endIndex, jintArray format, 771 jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats) 772{ 773 jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL); 774 775 jboolean result = android_os_Process_parseProcLineArray(env, clazz, 776 (char*) bufferArray, startIndex, endIndex, format, outStrings, 777 outLongs, outFloats); 778 779 env->ReleaseByteArrayElements(buffer, bufferArray, 0); 780 781 return result; 782} 783 784jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz, 785 jstring file, jintArray format, jobjectArray outStrings, 786 jlongArray outLongs, jfloatArray outFloats) 787{ 788 if (file == NULL || format == NULL) { 789 jniThrowNullPointerException(env, NULL); 790 return JNI_FALSE; 791 } 792 793 const char* file8 = env->GetStringUTFChars(file, NULL); 794 if (file8 == NULL) { 795 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 796 return JNI_FALSE; 797 } 798 int fd = open(file8, O_RDONLY); 799 env->ReleaseStringUTFChars(file, file8); 800 801 if (fd < 0) { 802 //ALOGW("Unable to open process file: %s\n", file8); 803 return JNI_FALSE; 804 } 805 806 char buffer[256]; 807 const int len = read(fd, buffer, sizeof(buffer)-1); 808 close(fd); 809 810 if (len < 0) { 811 //ALOGW("Unable to open process file: %s fd=%d\n", file8, fd); 812 return JNI_FALSE; 813 } 814 buffer[len] = 0; 815 816 return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len, 817 format, outStrings, outLongs, outFloats); 818 819} 820 821void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz, 822 jobject binderObject) 823{ 824 if (binderObject == NULL) { 825 jniThrowNullPointerException(env, NULL); 826 return; 827 } 828 829 sp<IBinder> binder = ibinderForJavaObject(env, binderObject); 830} 831 832void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig) 833{ 834 if (pid > 0) { 835 ALOGI("Sending signal. PID: %d SIG: %d", pid, sig); 836 kill(pid, sig); 837 } 838} 839 840void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig) 841{ 842 if (pid > 0) { 843 kill(pid, sig); 844 } 845} 846 847static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz) 848{ 849 struct timespec ts; 850 851 int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts); 852 853 if (res != 0) { 854 return (jlong) 0; 855 } 856 857 nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec; 858 return (jlong) nanoseconds_to_milliseconds(when); 859} 860 861static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid) 862{ 863 char filename[64]; 864 865 snprintf(filename, sizeof(filename), "/proc/%d/smaps", pid); 866 867 FILE * file = fopen(filename, "r"); 868 if (!file) { 869 return (jlong) -1; 870 } 871 872 // Tally up all of the Pss from the various maps 873 char line[256]; 874 jlong pss = 0; 875 while (fgets(line, sizeof(line), file)) { 876 jlong v; 877 if (sscanf(line, "Pss: %lld kB", &v) == 1) { 878 pss += v; 879 } 880 } 881 882 fclose(file); 883 884 // Return the Pss value in bytes, not kilobytes 885 return pss * 1024; 886} 887 888jintArray android_os_Process_getPidsForCommands(JNIEnv* env, jobject clazz, 889 jobjectArray commandNames) 890{ 891 if (commandNames == NULL) { 892 jniThrowNullPointerException(env, NULL); 893 return NULL; 894 } 895 896 Vector<String8> commands; 897 898 jsize count = env->GetArrayLength(commandNames); 899 900 for (int i=0; i<count; i++) { 901 jobject obj = env->GetObjectArrayElement(commandNames, i); 902 if (obj != NULL) { 903 const char* str8 = env->GetStringUTFChars((jstring)obj, NULL); 904 if (str8 == NULL) { 905 jniThrowNullPointerException(env, "Element in commandNames"); 906 return NULL; 907 } 908 commands.add(String8(str8)); 909 env->ReleaseStringUTFChars((jstring)obj, str8); 910 } else { 911 jniThrowNullPointerException(env, "Element in commandNames"); 912 return NULL; 913 } 914 } 915 916 Vector<jint> pids; 917 918 DIR *proc = opendir("/proc"); 919 if (proc == NULL) { 920 fprintf(stderr, "/proc: %s\n", strerror(errno)); 921 return NULL; 922 } 923 924 struct dirent *d; 925 while ((d = readdir(proc))) { 926 int pid = atoi(d->d_name); 927 if (pid <= 0) continue; 928 929 char path[PATH_MAX]; 930 char data[PATH_MAX]; 931 snprintf(path, sizeof(path), "/proc/%d/cmdline", pid); 932 933 int fd = open(path, O_RDONLY); 934 if (fd < 0) { 935 continue; 936 } 937 const int len = read(fd, data, sizeof(data)-1); 938 close(fd); 939 940 if (len < 0) { 941 continue; 942 } 943 data[len] = 0; 944 945 for (int i=0; i<len; i++) { 946 if (data[i] == ' ') { 947 data[i] = 0; 948 break; 949 } 950 } 951 952 for (size_t i=0; i<commands.size(); i++) { 953 if (commands[i] == data) { 954 pids.add(pid); 955 break; 956 } 957 } 958 } 959 960 closedir(proc); 961 962 jintArray pidArray = env->NewIntArray(pids.size()); 963 if (pidArray == NULL) { 964 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 965 return NULL; 966 } 967 968 if (pids.size() > 0) { 969 env->SetIntArrayRegion(pidArray, 0, pids.size(), pids.array()); 970 } 971 972 return pidArray; 973} 974 975static const JNINativeMethod methods[] = { 976 {"getUidForName", "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName}, 977 {"getGidForName", "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName}, 978 {"setThreadPriority", "(II)V", (void*)android_os_Process_setThreadPriority}, 979 {"setThreadScheduler", "(III)V", (void*)android_os_Process_setThreadScheduler}, 980 {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground}, 981 {"setThreadPriority", "(I)V", (void*)android_os_Process_setCallingThreadPriority}, 982 {"getThreadPriority", "(I)I", (void*)android_os_Process_getThreadPriority}, 983 {"setThreadGroup", "(II)V", (void*)android_os_Process_setThreadGroup}, 984 {"setProcessGroup", "(II)V", (void*)android_os_Process_setProcessGroup}, 985 {"getProcessGroup", "(I)I", (void*)android_os_Process_getProcessGroup}, 986 {"setOomAdj", "(II)Z", (void*)android_os_Process_setOomAdj}, 987 {"setArgV0", "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0}, 988 {"setUid", "(I)I", (void*)android_os_Process_setUid}, 989 {"setGid", "(I)I", (void*)android_os_Process_setGid}, 990 {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal}, 991 {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet}, 992 {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory}, 993 {"getTotalMemory", "()J", (void*)android_os_Process_getTotalMemory}, 994 {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines}, 995 {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids}, 996 {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile}, 997 {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine}, 998 {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime}, 999 {"getPss", "(I)J", (void*)android_os_Process_getPss}, 1000 {"getPidsForCommands", "([Ljava/lang/String;)[I", (void*)android_os_Process_getPidsForCommands}, 1001 //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject}, 1002}; 1003 1004const char* const kProcessPathName = "android/os/Process"; 1005 1006int register_android_os_Process(JNIEnv* env) 1007{ 1008 return AndroidRuntime::registerNativeMethods( 1009 env, kProcessPathName, 1010 methods, NELEM(methods)); 1011} 1012