android_util_Process.cpp revision 9e57c414f39e1a31349bc215635fdcfaf1902cee
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_myPid(JNIEnv* env, jobject clazz) 98{ 99 return getpid(); 100} 101 102jint android_os_Process_myUid(JNIEnv* env, jobject clazz) 103{ 104 return getuid(); 105} 106 107jint android_os_Process_myTid(JNIEnv* env, jobject clazz) 108{ 109 return androidGetTid(); 110} 111 112jint 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 143jint 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 174void 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 184void 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 271jint android_os_Process_getProcessGroup(JNIEnv* env, jobject clazz, jint pid) 272{ 273 SchedPolicy sp; 274 if (get_sched_policy(pid, &sp) != 0) { 275 signalExceptionForGroupError(env, errno); 276 } 277 return (int) sp; 278} 279 280static void android_os_Process_setCanSelfBackground(JNIEnv* env, jobject clazz, jboolean bgOk) { 281 // Establishes the calling thread as illegal to put into the background. 282 // Typically used only for the system process's main looper. 283#if GUARD_THREAD_PRIORITY 284 ALOGV("Process.setCanSelfBackground(%d) : tid=%d", bgOk, androidGetTid()); 285 { 286 Mutex::Autolock _l(gKeyCreateMutex); 287 if (gBgKey == -1) { 288 pthread_key_create(&gBgKey, NULL); 289 } 290 } 291 292 // inverted: not-okay, we set a sentinel value 293 pthread_setspecific(gBgKey, (void*)(bgOk ? 0 : 0xbaad)); 294#endif 295} 296 297void android_os_Process_setThreadScheduler(JNIEnv* env, jclass clazz, 298 jint tid, jint policy, jint pri) 299{ 300#ifdef HAVE_SCHED_SETSCHEDULER 301 struct sched_param param; 302 param.sched_priority = pri; 303 int rc = sched_setscheduler(tid, policy, ¶m); 304 if (rc) { 305 signalExceptionForPriorityError(env, errno); 306 } 307#else 308 signalExceptionForPriorityError(env, ENOSYS); 309#endif 310} 311 312void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz, 313 jint pid, jint pri) 314{ 315#if GUARD_THREAD_PRIORITY 316 // if we're putting the current thread into the background, check the TLS 317 // to make sure this thread isn't guarded. If it is, raise an exception. 318 if (pri >= ANDROID_PRIORITY_BACKGROUND) { 319 if (pid == androidGetTid()) { 320 void* bgOk = pthread_getspecific(gBgKey); 321 if (bgOk == ((void*)0xbaad)) { 322 ALOGE("Thread marked fg-only put self in background!"); 323 jniThrowException(env, "java/lang/SecurityException", "May not put this thread into background"); 324 return; 325 } 326 } 327 } 328#endif 329 330 int rc = androidSetThreadPriority(pid, pri); 331 if (rc != 0) { 332 if (rc == INVALID_OPERATION) { 333 signalExceptionForPriorityError(env, errno); 334 } else { 335 signalExceptionForGroupError(env, errno); 336 } 337 } 338 339 //ALOGI("Setting priority of %d: %d, getpriority returns %d\n", 340 // pid, pri, getpriority(PRIO_PROCESS, pid)); 341} 342 343void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz, 344 jint pri) 345{ 346 jint tid = android_os_Process_myTid(env, clazz); 347 android_os_Process_setThreadPriority(env, clazz, tid, pri); 348} 349 350jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz, 351 jint pid) 352{ 353 errno = 0; 354 jint pri = getpriority(PRIO_PROCESS, pid); 355 if (errno != 0) { 356 signalExceptionForPriorityError(env, errno); 357 } 358 //ALOGI("Returning priority of %d: %d\n", pid, pri); 359 return pri; 360} 361 362jboolean android_os_Process_setOomAdj(JNIEnv* env, jobject clazz, 363 jint pid, jint adj) 364{ 365#ifdef HAVE_OOM_ADJ 366 char text[64]; 367 sprintf(text, "/proc/%d/oom_adj", pid); 368 int fd = open(text, O_WRONLY); 369 if (fd >= 0) { 370 sprintf(text, "%d", adj); 371 write(fd, text, strlen(text)); 372 close(fd); 373 } 374 return true; 375#endif 376 return false; 377} 378 379void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name) 380{ 381 if (name == NULL) { 382 jniThrowNullPointerException(env, NULL); 383 return; 384 } 385 386 const jchar* str = env->GetStringCritical(name, 0); 387 String8 name8; 388 if (str) { 389 name8 = String8(str, env->GetStringLength(name)); 390 env->ReleaseStringCritical(name, str); 391 } 392 393 if (name8.size() > 0) { 394 ProcessState::self()->setArgV0(name8.string()); 395 } 396} 397 398jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid) 399{ 400 return setuid(uid) == 0 ? 0 : errno; 401} 402 403jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid) 404{ 405 return setgid(uid) == 0 ? 0 : errno; 406} 407 408static int pid_compare(const void* v1, const void* v2) 409{ 410 //ALOGI("Compare %d vs %d\n", *((const jint*)v1), *((const jint*)v2)); 411 return *((const jint*)v1) - *((const jint*)v2); 412} 413 414static jlong getFreeMemoryImpl(const char* const sums[], const int sumsLen[], int num) 415{ 416 int fd = open("/proc/meminfo", O_RDONLY); 417 418 if (fd < 0) { 419 ALOGW("Unable to open /proc/meminfo"); 420 return -1; 421 } 422 423 char buffer[256]; 424 const int len = read(fd, buffer, sizeof(buffer)-1); 425 close(fd); 426 427 if (len < 0) { 428 ALOGW("Unable to read /proc/meminfo"); 429 return -1; 430 } 431 buffer[len] = 0; 432 433 int numFound = 0; 434 jlong mem = 0; 435 436 char* p = buffer; 437 while (*p && numFound < num) { 438 int i = 0; 439 while (sums[i]) { 440 if (strncmp(p, sums[i], sumsLen[i]) == 0) { 441 p += sumsLen[i]; 442 while (*p == ' ') p++; 443 char* num = p; 444 while (*p >= '0' && *p <= '9') p++; 445 if (*p != 0) { 446 *p = 0; 447 p++; 448 if (*p == 0) p--; 449 } 450 mem += atoll(num) * 1024; 451 numFound++; 452 break; 453 } 454 i++; 455 } 456 p++; 457 } 458 459 return numFound > 0 ? mem : -1; 460} 461 462static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz) 463{ 464 static const char* const sums[] = { "MemFree:", "Cached:", NULL }; 465 static const int sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), 0 }; 466 return getFreeMemoryImpl(sums, sumsLen, 2); 467} 468 469static jlong android_os_Process_getTotalMemory(JNIEnv* env, jobject clazz) 470{ 471 static const char* const sums[] = { "MemTotal:", NULL }; 472 static const int sumsLen[] = { strlen("MemTotal:"), 0 }; 473 return getFreeMemoryImpl(sums, sumsLen, 1); 474} 475 476void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr, 477 jobjectArray reqFields, jlongArray outFields) 478{ 479 //ALOGI("getMemInfo: %p %p", reqFields, outFields); 480 481 if (fileStr == NULL || reqFields == NULL || outFields == NULL) { 482 jniThrowNullPointerException(env, NULL); 483 return; 484 } 485 486 const char* file8 = env->GetStringUTFChars(fileStr, NULL); 487 if (file8 == NULL) { 488 return; 489 } 490 String8 file(file8); 491 env->ReleaseStringUTFChars(fileStr, file8); 492 493 jsize count = env->GetArrayLength(reqFields); 494 if (count > env->GetArrayLength(outFields)) { 495 jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ"); 496 return; 497 } 498 499 Vector<String8> fields; 500 int i; 501 502 for (i=0; i<count; i++) { 503 jobject obj = env->GetObjectArrayElement(reqFields, i); 504 if (obj != NULL) { 505 const char* str8 = env->GetStringUTFChars((jstring)obj, NULL); 506 //ALOGI("String at %d: %p = %s", i, obj, str8); 507 if (str8 == NULL) { 508 jniThrowNullPointerException(env, "Element in reqFields"); 509 return; 510 } 511 fields.add(String8(str8)); 512 env->ReleaseStringUTFChars((jstring)obj, str8); 513 } else { 514 jniThrowNullPointerException(env, "Element in reqFields"); 515 return; 516 } 517 } 518 519 jlong* sizesArray = env->GetLongArrayElements(outFields, 0); 520 if (sizesArray == NULL) { 521 return; 522 } 523 524 //ALOGI("Clearing %d sizes", count); 525 for (i=0; i<count; i++) { 526 sizesArray[i] = 0; 527 } 528 529 int fd = open(file.string(), O_RDONLY); 530 531 if (fd >= 0) { 532 const size_t BUFFER_SIZE = 2048; 533 char* buffer = (char*)malloc(BUFFER_SIZE); 534 int len = read(fd, buffer, BUFFER_SIZE-1); 535 close(fd); 536 537 if (len < 0) { 538 ALOGW("Unable to read %s", file.string()); 539 len = 0; 540 } 541 buffer[len] = 0; 542 543 int foundCount = 0; 544 545 char* p = buffer; 546 while (*p && foundCount < count) { 547 bool skipToEol = true; 548 //ALOGI("Parsing at: %s", p); 549 for (i=0; i<count; i++) { 550 const String8& field = fields[i]; 551 if (strncmp(p, field.string(), field.length()) == 0) { 552 p += field.length(); 553 while (*p == ' ' || *p == '\t') p++; 554 char* num = p; 555 while (*p >= '0' && *p <= '9') p++; 556 skipToEol = *p != '\n'; 557 if (*p != 0) { 558 *p = 0; 559 p++; 560 } 561 char* end; 562 sizesArray[i] = strtoll(num, &end, 10); 563 //ALOGI("Field %s = %d", field.string(), sizesArray[i]); 564 foundCount++; 565 break; 566 } 567 } 568 if (skipToEol) { 569 while (*p && *p != '\n') { 570 p++; 571 } 572 if (*p == '\n') { 573 p++; 574 } 575 } 576 } 577 578 free(buffer); 579 } else { 580 ALOGW("Unable to open %s", file.string()); 581 } 582 583 //ALOGI("Done!"); 584 env->ReleaseLongArrayElements(outFields, sizesArray, 0); 585} 586 587jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz, 588 jstring file, jintArray lastArray) 589{ 590 if (file == NULL) { 591 jniThrowNullPointerException(env, NULL); 592 return NULL; 593 } 594 595 const char* file8 = env->GetStringUTFChars(file, NULL); 596 if (file8 == NULL) { 597 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 598 return NULL; 599 } 600 601 DIR* dirp = opendir(file8); 602 603 env->ReleaseStringUTFChars(file, file8); 604 605 if(dirp == NULL) { 606 return NULL; 607 } 608 609 jsize curCount = 0; 610 jint* curData = NULL; 611 if (lastArray != NULL) { 612 curCount = env->GetArrayLength(lastArray); 613 curData = env->GetIntArrayElements(lastArray, 0); 614 } 615 616 jint curPos = 0; 617 618 struct dirent* entry; 619 while ((entry=readdir(dirp)) != NULL) { 620 const char* p = entry->d_name; 621 while (*p) { 622 if (*p < '0' || *p > '9') break; 623 p++; 624 } 625 if (*p != 0) continue; 626 627 char* end; 628 int pid = strtol(entry->d_name, &end, 10); 629 //ALOGI("File %s pid=%d\n", entry->d_name, pid); 630 if (curPos >= curCount) { 631 jsize newCount = (curCount == 0) ? 10 : (curCount*2); 632 jintArray newArray = env->NewIntArray(newCount); 633 if (newArray == NULL) { 634 closedir(dirp); 635 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 636 return NULL; 637 } 638 jint* newData = env->GetIntArrayElements(newArray, 0); 639 if (curData != NULL) { 640 memcpy(newData, curData, sizeof(jint)*curCount); 641 env->ReleaseIntArrayElements(lastArray, curData, 0); 642 } 643 lastArray = newArray; 644 curCount = newCount; 645 curData = newData; 646 } 647 648 curData[curPos] = pid; 649 curPos++; 650 } 651 652 closedir(dirp); 653 654 if (curData != NULL && curPos > 0) { 655 qsort(curData, curPos, sizeof(jint), pid_compare); 656 } 657 658 while (curPos < curCount) { 659 curData[curPos] = -1; 660 curPos++; 661 } 662 663 if (curData != NULL) { 664 env->ReleaseIntArrayElements(lastArray, curData, 0); 665 } 666 667 return lastArray; 668} 669 670enum { 671 PROC_TERM_MASK = 0xff, 672 PROC_ZERO_TERM = 0, 673 PROC_SPACE_TERM = ' ', 674 PROC_COMBINE = 0x100, 675 PROC_PARENS = 0x200, 676 PROC_OUT_STRING = 0x1000, 677 PROC_OUT_LONG = 0x2000, 678 PROC_OUT_FLOAT = 0x4000, 679}; 680 681jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz, 682 char* buffer, jint startIndex, jint endIndex, jintArray format, 683 jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats) 684{ 685 686 const jsize NF = env->GetArrayLength(format); 687 const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0; 688 const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0; 689 const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0; 690 691 jint* formatData = env->GetIntArrayElements(format, 0); 692 jlong* longsData = outLongs ? 693 env->GetLongArrayElements(outLongs, 0) : NULL; 694 jfloat* floatsData = outFloats ? 695 env->GetFloatArrayElements(outFloats, 0) : NULL; 696 if (formatData == NULL || (NL > 0 && longsData == NULL) 697 || (NR > 0 && floatsData == NULL)) { 698 if (formatData != NULL) { 699 env->ReleaseIntArrayElements(format, formatData, 0); 700 } 701 if (longsData != NULL) { 702 env->ReleaseLongArrayElements(outLongs, longsData, 0); 703 } 704 if (floatsData != NULL) { 705 env->ReleaseFloatArrayElements(outFloats, floatsData, 0); 706 } 707 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 708 return JNI_FALSE; 709 } 710 711 jsize i = startIndex; 712 jsize di = 0; 713 714 jboolean res = JNI_TRUE; 715 716 for (jsize fi=0; fi<NF; fi++) { 717 const jint mode = formatData[fi]; 718 if ((mode&PROC_PARENS) != 0) { 719 i++; 720 } 721 const char term = (char)(mode&PROC_TERM_MASK); 722 const jsize start = i; 723 if (i >= endIndex) { 724 res = JNI_FALSE; 725 break; 726 } 727 728 jsize end = -1; 729 if ((mode&PROC_PARENS) != 0) { 730 while (buffer[i] != ')' && i < endIndex) { 731 i++; 732 } 733 end = i; 734 i++; 735 } 736 while (buffer[i] != term && i < endIndex) { 737 i++; 738 } 739 if (end < 0) { 740 end = i; 741 } 742 743 if (i < endIndex) { 744 i++; 745 if ((mode&PROC_COMBINE) != 0) { 746 while (buffer[i] == term && i < endIndex) { 747 i++; 748 } 749 } 750 } 751 752 //ALOGI("Field %d: %d-%d dest=%d mode=0x%x\n", i, start, end, di, mode); 753 754 if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) { 755 char c = buffer[end]; 756 buffer[end] = 0; 757 if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) { 758 char* end; 759 floatsData[di] = strtof(buffer+start, &end); 760 } 761 if ((mode&PROC_OUT_LONG) != 0 && di < NL) { 762 char* end; 763 longsData[di] = strtoll(buffer+start, &end, 10); 764 } 765 if ((mode&PROC_OUT_STRING) != 0 && di < NS) { 766 jstring str = env->NewStringUTF(buffer+start); 767 env->SetObjectArrayElement(outStrings, di, str); 768 } 769 buffer[end] = c; 770 di++; 771 } 772 } 773 774 env->ReleaseIntArrayElements(format, formatData, 0); 775 if (longsData != NULL) { 776 env->ReleaseLongArrayElements(outLongs, longsData, 0); 777 } 778 if (floatsData != NULL) { 779 env->ReleaseFloatArrayElements(outFloats, floatsData, 0); 780 } 781 782 return res; 783} 784 785jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz, 786 jbyteArray buffer, jint startIndex, jint endIndex, jintArray format, 787 jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats) 788{ 789 jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL); 790 791 jboolean result = android_os_Process_parseProcLineArray(env, clazz, 792 (char*) bufferArray, startIndex, endIndex, format, outStrings, 793 outLongs, outFloats); 794 795 env->ReleaseByteArrayElements(buffer, bufferArray, 0); 796 797 return result; 798} 799 800jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz, 801 jstring file, jintArray format, jobjectArray outStrings, 802 jlongArray outLongs, jfloatArray outFloats) 803{ 804 if (file == NULL || format == NULL) { 805 jniThrowNullPointerException(env, NULL); 806 return JNI_FALSE; 807 } 808 809 const char* file8 = env->GetStringUTFChars(file, NULL); 810 if (file8 == NULL) { 811 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 812 return JNI_FALSE; 813 } 814 int fd = open(file8, O_RDONLY); 815 env->ReleaseStringUTFChars(file, file8); 816 817 if (fd < 0) { 818 //ALOGW("Unable to open process file: %s\n", file8); 819 return JNI_FALSE; 820 } 821 822 char buffer[256]; 823 const int len = read(fd, buffer, sizeof(buffer)-1); 824 close(fd); 825 826 if (len < 0) { 827 //ALOGW("Unable to open process file: %s fd=%d\n", file8, fd); 828 return JNI_FALSE; 829 } 830 buffer[len] = 0; 831 832 return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len, 833 format, outStrings, outLongs, outFloats); 834 835} 836 837void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz, 838 jobject binderObject) 839{ 840 if (binderObject == NULL) { 841 jniThrowNullPointerException(env, NULL); 842 return; 843 } 844 845 sp<IBinder> binder = ibinderForJavaObject(env, binderObject); 846} 847 848void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig) 849{ 850 if (pid > 0) { 851 ALOGI("Sending signal. PID: %d SIG: %d", pid, sig); 852 kill(pid, sig); 853 } 854} 855 856void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig) 857{ 858 if (pid > 0) { 859 kill(pid, sig); 860 } 861} 862 863static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz) 864{ 865 struct timespec ts; 866 867 int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts); 868 869 if (res != 0) { 870 return (jlong) 0; 871 } 872 873 nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec; 874 return (jlong) nanoseconds_to_milliseconds(when); 875} 876 877static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid) 878{ 879 char filename[64]; 880 881 snprintf(filename, sizeof(filename), "/proc/%d/smaps", pid); 882 883 FILE * file = fopen(filename, "r"); 884 if (!file) { 885 return (jlong) -1; 886 } 887 888 // Tally up all of the Pss from the various maps 889 char line[256]; 890 jlong pss = 0; 891 while (fgets(line, sizeof(line), file)) { 892 jlong v; 893 if (sscanf(line, "Pss: %lld kB", &v) == 1) { 894 pss += v; 895 } 896 } 897 898 fclose(file); 899 900 // Return the Pss value in bytes, not kilobytes 901 return pss * 1024; 902} 903 904jintArray android_os_Process_getPidsForCommands(JNIEnv* env, jobject clazz, 905 jobjectArray commandNames) 906{ 907 if (commandNames == NULL) { 908 jniThrowNullPointerException(env, NULL); 909 return NULL; 910 } 911 912 Vector<String8> commands; 913 914 jsize count = env->GetArrayLength(commandNames); 915 916 for (int i=0; i<count; i++) { 917 jobject obj = env->GetObjectArrayElement(commandNames, i); 918 if (obj != NULL) { 919 const char* str8 = env->GetStringUTFChars((jstring)obj, NULL); 920 if (str8 == NULL) { 921 jniThrowNullPointerException(env, "Element in commandNames"); 922 return NULL; 923 } 924 commands.add(String8(str8)); 925 env->ReleaseStringUTFChars((jstring)obj, str8); 926 } else { 927 jniThrowNullPointerException(env, "Element in commandNames"); 928 return NULL; 929 } 930 } 931 932 Vector<jint> pids; 933 934 DIR *proc = opendir("/proc"); 935 if (proc == NULL) { 936 fprintf(stderr, "/proc: %s\n", strerror(errno)); 937 return NULL; 938 } 939 940 struct dirent *d; 941 while ((d = readdir(proc))) { 942 int pid = atoi(d->d_name); 943 if (pid <= 0) continue; 944 945 char path[PATH_MAX]; 946 char data[PATH_MAX]; 947 snprintf(path, sizeof(path), "/proc/%d/cmdline", pid); 948 949 int fd = open(path, O_RDONLY); 950 if (fd < 0) { 951 continue; 952 } 953 const int len = read(fd, data, sizeof(data)-1); 954 close(fd); 955 956 if (len < 0) { 957 continue; 958 } 959 data[len] = 0; 960 961 for (int i=0; i<len; i++) { 962 if (data[i] == ' ') { 963 data[i] = 0; 964 break; 965 } 966 } 967 968 for (size_t i=0; i<commands.size(); i++) { 969 if (commands[i] == data) { 970 pids.add(pid); 971 break; 972 } 973 } 974 } 975 976 closedir(proc); 977 978 jintArray pidArray = env->NewIntArray(pids.size()); 979 if (pidArray == NULL) { 980 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 981 return NULL; 982 } 983 984 if (pids.size() > 0) { 985 env->SetIntArrayRegion(pidArray, 0, pids.size(), pids.array()); 986 } 987 988 return pidArray; 989} 990 991static const JNINativeMethod methods[] = { 992 {"myPid", "()I", (void*)android_os_Process_myPid}, 993 {"myTid", "()I", (void*)android_os_Process_myTid}, 994 {"myUid", "()I", (void*)android_os_Process_myUid}, 995 {"getUidForName", "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName}, 996 {"getGidForName", "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName}, 997 {"setThreadPriority", "(II)V", (void*)android_os_Process_setThreadPriority}, 998 {"setThreadScheduler", "(III)V", (void*)android_os_Process_setThreadScheduler}, 999 {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground}, 1000 {"setThreadPriority", "(I)V", (void*)android_os_Process_setCallingThreadPriority}, 1001 {"getThreadPriority", "(I)I", (void*)android_os_Process_getThreadPriority}, 1002 {"setThreadGroup", "(II)V", (void*)android_os_Process_setThreadGroup}, 1003 {"setProcessGroup", "(II)V", (void*)android_os_Process_setProcessGroup}, 1004 {"getProcessGroup", "(I)I", (void*)android_os_Process_getProcessGroup}, 1005 {"setOomAdj", "(II)Z", (void*)android_os_Process_setOomAdj}, 1006 {"setArgV0", "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0}, 1007 {"setUid", "(I)I", (void*)android_os_Process_setUid}, 1008 {"setGid", "(I)I", (void*)android_os_Process_setGid}, 1009 {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal}, 1010 {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet}, 1011 {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory}, 1012 {"getTotalMemory", "()J", (void*)android_os_Process_getTotalMemory}, 1013 {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines}, 1014 {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids}, 1015 {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile}, 1016 {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine}, 1017 {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime}, 1018 {"getPss", "(I)J", (void*)android_os_Process_getPss}, 1019 {"getPidsForCommands", "([Ljava/lang/String;)[I", (void*)android_os_Process_getPidsForCommands}, 1020 //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject}, 1021}; 1022 1023const char* const kProcessPathName = "android/os/Process"; 1024 1025int register_android_os_Process(JNIEnv* env) 1026{ 1027 return AndroidRuntime::registerNativeMethods( 1028 env, kProcessPathName, 1029 methods, NELEM(methods)); 1030} 1031