android_util_Process.cpp revision 71ae2bd42be21de6d25d1f8c52e3973c172462df
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/IServiceManager.h> 23#include <cutils/process_name.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 <sys/stat.h> 37#include <dirent.h> 38#include <fcntl.h> 39#include <grp.h> 40#include <pwd.h> 41#include <signal.h> 42#include <unistd.h> 43 44#define POLICY_DEBUG 0 45#define GUARD_THREAD_PRIORITY 0 46 47using namespace android; 48 49#if GUARD_THREAD_PRIORITY 50Mutex gKeyCreateMutex; 51static pthread_key_t gBgKey = -1; 52#endif 53 54// For both of these, err should be in the errno range (positive), not a status_t (negative) 55 56static void signalExceptionForPriorityError(JNIEnv* env, int err) 57{ 58 switch (err) { 59 case EINVAL: 60 jniThrowException(env, "java/lang/IllegalArgumentException", NULL); 61 break; 62 case ESRCH: 63 jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist"); 64 break; 65 case EPERM: 66 jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread"); 67 break; 68 case EACCES: 69 jniThrowException(env, "java/lang/SecurityException", "No permission to set to given priority"); 70 break; 71 default: 72 jniThrowException(env, "java/lang/RuntimeException", "Unknown error"); 73 break; 74 } 75} 76 77static void signalExceptionForGroupError(JNIEnv* env, int err) 78{ 79 switch (err) { 80 case EINVAL: 81 jniThrowException(env, "java/lang/IllegalArgumentException", NULL); 82 break; 83 case ESRCH: 84 jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist"); 85 break; 86 case EPERM: 87 jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread"); 88 break; 89 case EACCES: 90 jniThrowException(env, "java/lang/SecurityException", "No permission to set to given group"); 91 break; 92 default: 93 jniThrowException(env, "java/lang/RuntimeException", "Unknown error"); 94 break; 95 } 96} 97 98jint android_os_Process_getUidForName(JNIEnv* env, jobject clazz, jstring name) 99{ 100 if (name == NULL) { 101 jniThrowNullPointerException(env, NULL); 102 return -1; 103 } 104 105 const jchar* str16 = env->GetStringCritical(name, 0); 106 String8 name8; 107 if (str16) { 108 name8 = String8(str16, env->GetStringLength(name)); 109 env->ReleaseStringCritical(name, str16); 110 } 111 112 const size_t N = name8.size(); 113 if (N > 0) { 114 const char* str = name8.string(); 115 for (size_t i=0; i<N; i++) { 116 if (str[i] < '0' || str[i] > '9') { 117 struct passwd* pwd = getpwnam(str); 118 if (pwd == NULL) { 119 return -1; 120 } 121 return pwd->pw_uid; 122 } 123 } 124 return atoi(str); 125 } 126 return -1; 127} 128 129jint android_os_Process_getGidForName(JNIEnv* env, jobject clazz, jstring name) 130{ 131 if (name == NULL) { 132 jniThrowNullPointerException(env, NULL); 133 return -1; 134 } 135 136 const jchar* str16 = env->GetStringCritical(name, 0); 137 String8 name8; 138 if (str16) { 139 name8 = String8(str16, env->GetStringLength(name)); 140 env->ReleaseStringCritical(name, str16); 141 } 142 143 const size_t N = name8.size(); 144 if (N > 0) { 145 const char* str = name8.string(); 146 for (size_t i=0; i<N; i++) { 147 if (str[i] < '0' || str[i] > '9') { 148 struct group* grp = getgrnam(str); 149 if (grp == NULL) { 150 return -1; 151 } 152 return grp->gr_gid; 153 } 154 } 155 return atoi(str); 156 } 157 return -1; 158} 159 160void android_os_Process_setThreadGroup(JNIEnv* env, jobject clazz, int tid, jint grp) 161{ 162 ALOGV("%s tid=%d grp=%d", __func__, tid, grp); 163 SchedPolicy sp = (SchedPolicy) grp; 164 int res = set_sched_policy(tid, sp); 165 if (res != NO_ERROR) { 166 signalExceptionForGroupError(env, -res); 167 } 168} 169 170void android_os_Process_setProcessGroup(JNIEnv* env, jobject clazz, int pid, jint grp) 171{ 172 ALOGV("%s pid=%d grp=%d", __func__, pid, grp); 173 DIR *d; 174 FILE *fp; 175 char proc_path[255]; 176 struct dirent *de; 177 178 if ((grp == SP_FOREGROUND) || (grp > SP_MAX)) { 179 signalExceptionForGroupError(env, EINVAL); 180 return; 181 } 182 183 bool isDefault = false; 184 if (grp < 0) { 185 grp = SP_FOREGROUND; 186 isDefault = true; 187 } 188 SchedPolicy sp = (SchedPolicy) grp; 189 190#if POLICY_DEBUG 191 char cmdline[32]; 192 int fd; 193 194 strcpy(cmdline, "unknown"); 195 196 sprintf(proc_path, "/proc/%d/cmdline", pid); 197 fd = open(proc_path, O_RDONLY); 198 if (fd >= 0) { 199 int rc = read(fd, cmdline, sizeof(cmdline)-1); 200 cmdline[rc] = 0; 201 close(fd); 202 } 203 204 if (sp == SP_BACKGROUND) { 205 ALOGD("setProcessGroup: vvv pid %d (%s)", pid, cmdline); 206 } else { 207 ALOGD("setProcessGroup: ^^^ pid %d (%s)", pid, cmdline); 208 } 209#endif 210 sprintf(proc_path, "/proc/%d/task", pid); 211 if (!(d = opendir(proc_path))) { 212 // If the process exited on us, don't generate an exception 213 if (errno != ENOENT) 214 signalExceptionForGroupError(env, errno); 215 return; 216 } 217 218 while ((de = readdir(d))) { 219 int t_pid; 220 int t_pri; 221 222 if (de->d_name[0] == '.') 223 continue; 224 t_pid = atoi(de->d_name); 225 226 if (!t_pid) { 227 ALOGE("Error getting pid for '%s'\n", de->d_name); 228 continue; 229 } 230 231 t_pri = getpriority(PRIO_PROCESS, t_pid); 232 233 if (t_pri <= ANDROID_PRIORITY_AUDIO) { 234 int scheduler = sched_getscheduler(t_pid); 235 if ((scheduler == SCHED_FIFO) || (scheduler == SCHED_RR)) { 236 // This task wants to stay in it's current audio group so it can keep it's budget 237 continue; 238 } 239 } 240 241 if (isDefault) { 242 if (t_pri >= ANDROID_PRIORITY_BACKGROUND) { 243 // This task wants to stay at background 244 continue; 245 } 246 } 247 248 int err = set_sched_policy(t_pid, sp); 249 if (err != NO_ERROR) { 250 signalExceptionForGroupError(env, -err); 251 break; 252 } 253 } 254 closedir(d); 255} 256 257jint android_os_Process_getProcessGroup(JNIEnv* env, jobject clazz, jint pid) 258{ 259 SchedPolicy sp; 260 if (get_sched_policy(pid, &sp) != 0) { 261 signalExceptionForGroupError(env, errno); 262 } 263 return (int) sp; 264} 265 266static void android_os_Process_setCanSelfBackground(JNIEnv* env, jobject clazz, jboolean bgOk) { 267 // Establishes the calling thread as illegal to put into the background. 268 // Typically used only for the system process's main looper. 269#if GUARD_THREAD_PRIORITY 270 ALOGV("Process.setCanSelfBackground(%d) : tid=%d", bgOk, androidGetTid()); 271 { 272 Mutex::Autolock _l(gKeyCreateMutex); 273 if (gBgKey == -1) { 274 pthread_key_create(&gBgKey, NULL); 275 } 276 } 277 278 // inverted: not-okay, we set a sentinel value 279 pthread_setspecific(gBgKey, (void*)(bgOk ? 0 : 0xbaad)); 280#endif 281} 282 283void android_os_Process_setThreadScheduler(JNIEnv* env, jclass clazz, 284 jint tid, jint policy, jint pri) 285{ 286#ifdef HAVE_SCHED_SETSCHEDULER 287 struct sched_param param; 288 param.sched_priority = pri; 289 int rc = sched_setscheduler(tid, policy, ¶m); 290 if (rc) { 291 signalExceptionForPriorityError(env, errno); 292 } 293#else 294 signalExceptionForPriorityError(env, ENOSYS); 295#endif 296} 297 298void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz, 299 jint pid, jint pri) 300{ 301#if GUARD_THREAD_PRIORITY 302 // if we're putting the current thread into the background, check the TLS 303 // to make sure this thread isn't guarded. If it is, raise an exception. 304 if (pri >= ANDROID_PRIORITY_BACKGROUND) { 305 if (pid == androidGetTid()) { 306 void* bgOk = pthread_getspecific(gBgKey); 307 if (bgOk == ((void*)0xbaad)) { 308 ALOGE("Thread marked fg-only put self in background!"); 309 jniThrowException(env, "java/lang/SecurityException", "May not put this thread into background"); 310 return; 311 } 312 } 313 } 314#endif 315 316 int rc = androidSetThreadPriority(pid, pri); 317 if (rc != 0) { 318 if (rc == INVALID_OPERATION) { 319 signalExceptionForPriorityError(env, errno); 320 } else { 321 signalExceptionForGroupError(env, errno); 322 } 323 } 324 325 //ALOGI("Setting priority of %d: %d, getpriority returns %d\n", 326 // pid, pri, getpriority(PRIO_PROCESS, pid)); 327} 328 329void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz, 330 jint pri) 331{ 332 android_os_Process_setThreadPriority(env, clazz, androidGetTid(), pri); 333} 334 335jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz, 336 jint pid) 337{ 338 errno = 0; 339 jint pri = getpriority(PRIO_PROCESS, pid); 340 if (errno != 0) { 341 signalExceptionForPriorityError(env, errno); 342 } 343 //ALOGI("Returning priority of %d: %d\n", pid, pri); 344 return pri; 345} 346 347jboolean android_os_Process_setSwappiness(JNIEnv *env, jobject clazz, 348 jint pid, jboolean is_increased) 349{ 350 char text[64]; 351 352 if (is_increased) { 353 strcpy(text, "/sys/fs/cgroup/memory/sw/tasks"); 354 } else { 355 strcpy(text, "/sys/fs/cgroup/memory/tasks"); 356 } 357 358 struct stat st; 359 if (stat(text, &st) || !S_ISREG(st.st_mode)) { 360 return false; 361 } 362 363 int fd = open(text, O_WRONLY); 364 if (fd >= 0) { 365 sprintf(text, "%d", pid); 366 write(fd, text, strlen(text)); 367 close(fd); 368 } 369 370 return true; 371} 372 373void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name) 374{ 375 if (name == NULL) { 376 jniThrowNullPointerException(env, NULL); 377 return; 378 } 379 380 const jchar* str = env->GetStringCritical(name, 0); 381 String8 name8; 382 if (str) { 383 name8 = String8(str, env->GetStringLength(name)); 384 env->ReleaseStringCritical(name, str); 385 } 386 387 if (name8.size() > 0) { 388 const char* procName = name8.string(); 389 set_process_name(procName); 390 AndroidRuntime::getRuntime()->setArgv0(procName); 391 } 392} 393 394jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid) 395{ 396 return setuid(uid) == 0 ? 0 : errno; 397} 398 399jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid) 400{ 401 return setgid(uid) == 0 ? 0 : errno; 402} 403 404static int pid_compare(const void* v1, const void* v2) 405{ 406 //ALOGI("Compare %d vs %d\n", *((const jint*)v1), *((const jint*)v2)); 407 return *((const jint*)v1) - *((const jint*)v2); 408} 409 410static jlong getFreeMemoryImpl(const char* const sums[], const size_t sumsLen[], size_t num) 411{ 412 int fd = open("/proc/meminfo", O_RDONLY); 413 414 if (fd < 0) { 415 ALOGW("Unable to open /proc/meminfo"); 416 return -1; 417 } 418 419 char buffer[256]; 420 const int len = read(fd, buffer, sizeof(buffer)-1); 421 close(fd); 422 423 if (len < 0) { 424 ALOGW("Unable to read /proc/meminfo"); 425 return -1; 426 } 427 buffer[len] = 0; 428 429 size_t numFound = 0; 430 jlong mem = 0; 431 432 char* p = buffer; 433 while (*p && numFound < num) { 434 int i = 0; 435 while (sums[i]) { 436 if (strncmp(p, sums[i], sumsLen[i]) == 0) { 437 p += sumsLen[i]; 438 while (*p == ' ') p++; 439 char* num = p; 440 while (*p >= '0' && *p <= '9') p++; 441 if (*p != 0) { 442 *p = 0; 443 p++; 444 if (*p == 0) p--; 445 } 446 mem += atoll(num) * 1024; 447 numFound++; 448 break; 449 } 450 i++; 451 } 452 p++; 453 } 454 455 return numFound > 0 ? mem : -1; 456} 457 458static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz) 459{ 460 static const char* const sums[] = { "MemFree:", "Cached:", NULL }; 461 static const size_t sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), 0 }; 462 return getFreeMemoryImpl(sums, sumsLen, 2); 463} 464 465static jlong android_os_Process_getTotalMemory(JNIEnv* env, jobject clazz) 466{ 467 static const char* const sums[] = { "MemTotal:", NULL }; 468 static const size_t sumsLen[] = { strlen("MemTotal:"), 0 }; 469 return getFreeMemoryImpl(sums, sumsLen, 1); 470} 471 472void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr, 473 jobjectArray reqFields, jlongArray outFields) 474{ 475 //ALOGI("getMemInfo: %p %p", reqFields, outFields); 476 477 if (fileStr == NULL || reqFields == NULL || outFields == NULL) { 478 jniThrowNullPointerException(env, NULL); 479 return; 480 } 481 482 const char* file8 = env->GetStringUTFChars(fileStr, NULL); 483 if (file8 == NULL) { 484 return; 485 } 486 String8 file(file8); 487 env->ReleaseStringUTFChars(fileStr, file8); 488 489 jsize count = env->GetArrayLength(reqFields); 490 if (count > env->GetArrayLength(outFields)) { 491 jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ"); 492 return; 493 } 494 495 Vector<String8> fields; 496 int i; 497 498 for (i=0; i<count; i++) { 499 jobject obj = env->GetObjectArrayElement(reqFields, i); 500 if (obj != NULL) { 501 const char* str8 = env->GetStringUTFChars((jstring)obj, NULL); 502 //ALOGI("String at %d: %p = %s", i, obj, str8); 503 if (str8 == NULL) { 504 jniThrowNullPointerException(env, "Element in reqFields"); 505 return; 506 } 507 fields.add(String8(str8)); 508 env->ReleaseStringUTFChars((jstring)obj, str8); 509 } else { 510 jniThrowNullPointerException(env, "Element in reqFields"); 511 return; 512 } 513 } 514 515 jlong* sizesArray = env->GetLongArrayElements(outFields, 0); 516 if (sizesArray == NULL) { 517 return; 518 } 519 520 //ALOGI("Clearing %d sizes", count); 521 for (i=0; i<count; i++) { 522 sizesArray[i] = 0; 523 } 524 525 int fd = open(file.string(), O_RDONLY); 526 527 if (fd >= 0) { 528 const size_t BUFFER_SIZE = 2048; 529 char* buffer = (char*)malloc(BUFFER_SIZE); 530 int len = read(fd, buffer, BUFFER_SIZE-1); 531 close(fd); 532 533 if (len < 0) { 534 ALOGW("Unable to read %s", file.string()); 535 len = 0; 536 } 537 buffer[len] = 0; 538 539 int foundCount = 0; 540 541 char* p = buffer; 542 while (*p && foundCount < count) { 543 bool skipToEol = true; 544 //ALOGI("Parsing at: %s", p); 545 for (i=0; i<count; i++) { 546 const String8& field = fields[i]; 547 if (strncmp(p, field.string(), field.length()) == 0) { 548 p += field.length(); 549 while (*p == ' ' || *p == '\t') p++; 550 char* num = p; 551 while (*p >= '0' && *p <= '9') p++; 552 skipToEol = *p != '\n'; 553 if (*p != 0) { 554 *p = 0; 555 p++; 556 } 557 char* end; 558 sizesArray[i] = strtoll(num, &end, 10); 559 //ALOGI("Field %s = %d", field.string(), sizesArray[i]); 560 foundCount++; 561 break; 562 } 563 } 564 if (skipToEol) { 565 while (*p && *p != '\n') { 566 p++; 567 } 568 if (*p == '\n') { 569 p++; 570 } 571 } 572 } 573 574 free(buffer); 575 } else { 576 ALOGW("Unable to open %s", file.string()); 577 } 578 579 //ALOGI("Done!"); 580 env->ReleaseLongArrayElements(outFields, sizesArray, 0); 581} 582 583jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz, 584 jstring file, jintArray lastArray) 585{ 586 if (file == NULL) { 587 jniThrowNullPointerException(env, NULL); 588 return NULL; 589 } 590 591 const char* file8 = env->GetStringUTFChars(file, NULL); 592 if (file8 == NULL) { 593 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 594 return NULL; 595 } 596 597 DIR* dirp = opendir(file8); 598 599 env->ReleaseStringUTFChars(file, file8); 600 601 if(dirp == NULL) { 602 return NULL; 603 } 604 605 jsize curCount = 0; 606 jint* curData = NULL; 607 if (lastArray != NULL) { 608 curCount = env->GetArrayLength(lastArray); 609 curData = env->GetIntArrayElements(lastArray, 0); 610 } 611 612 jint curPos = 0; 613 614 struct dirent* entry; 615 while ((entry=readdir(dirp)) != NULL) { 616 const char* p = entry->d_name; 617 while (*p) { 618 if (*p < '0' || *p > '9') break; 619 p++; 620 } 621 if (*p != 0) continue; 622 623 char* end; 624 int pid = strtol(entry->d_name, &end, 10); 625 //ALOGI("File %s pid=%d\n", entry->d_name, pid); 626 if (curPos >= curCount) { 627 jsize newCount = (curCount == 0) ? 10 : (curCount*2); 628 jintArray newArray = env->NewIntArray(newCount); 629 if (newArray == NULL) { 630 closedir(dirp); 631 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 632 return NULL; 633 } 634 jint* newData = env->GetIntArrayElements(newArray, 0); 635 if (curData != NULL) { 636 memcpy(newData, curData, sizeof(jint)*curCount); 637 env->ReleaseIntArrayElements(lastArray, curData, 0); 638 } 639 lastArray = newArray; 640 curCount = newCount; 641 curData = newData; 642 } 643 644 curData[curPos] = pid; 645 curPos++; 646 } 647 648 closedir(dirp); 649 650 if (curData != NULL && curPos > 0) { 651 qsort(curData, curPos, sizeof(jint), pid_compare); 652 } 653 654 while (curPos < curCount) { 655 curData[curPos] = -1; 656 curPos++; 657 } 658 659 if (curData != NULL) { 660 env->ReleaseIntArrayElements(lastArray, curData, 0); 661 } 662 663 return lastArray; 664} 665 666enum { 667 PROC_TERM_MASK = 0xff, 668 PROC_ZERO_TERM = 0, 669 PROC_SPACE_TERM = ' ', 670 PROC_COMBINE = 0x100, 671 PROC_PARENS = 0x200, 672 PROC_QUOTES = 0x400, 673 PROC_OUT_STRING = 0x1000, 674 PROC_OUT_LONG = 0x2000, 675 PROC_OUT_FLOAT = 0x4000, 676}; 677 678jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz, 679 char* buffer, jint startIndex, jint endIndex, jintArray format, 680 jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats) 681{ 682 683 const jsize NF = env->GetArrayLength(format); 684 const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0; 685 const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0; 686 const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0; 687 688 jint* formatData = env->GetIntArrayElements(format, 0); 689 jlong* longsData = outLongs ? 690 env->GetLongArrayElements(outLongs, 0) : NULL; 691 jfloat* floatsData = outFloats ? 692 env->GetFloatArrayElements(outFloats, 0) : NULL; 693 if (formatData == NULL || (NL > 0 && longsData == NULL) 694 || (NR > 0 && floatsData == NULL)) { 695 if (formatData != NULL) { 696 env->ReleaseIntArrayElements(format, formatData, 0); 697 } 698 if (longsData != NULL) { 699 env->ReleaseLongArrayElements(outLongs, longsData, 0); 700 } 701 if (floatsData != NULL) { 702 env->ReleaseFloatArrayElements(outFloats, floatsData, 0); 703 } 704 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 705 return JNI_FALSE; 706 } 707 708 jsize i = startIndex; 709 jsize di = 0; 710 711 jboolean res = JNI_TRUE; 712 713 for (jsize fi=0; fi<NF; fi++) { 714 jint mode = formatData[fi]; 715 if ((mode&PROC_PARENS) != 0) { 716 i++; 717 } else if ((mode&PROC_QUOTES != 0)) { 718 if (buffer[i] == '"') { 719 i++; 720 } else { 721 mode &= ~PROC_QUOTES; 722 } 723 } 724 const char term = (char)(mode&PROC_TERM_MASK); 725 const jsize start = i; 726 if (i >= endIndex) { 727 res = JNI_FALSE; 728 break; 729 } 730 731 jsize end = -1; 732 if ((mode&PROC_PARENS) != 0) { 733 while (i < endIndex && buffer[i] != ')') { 734 i++; 735 } 736 end = i; 737 i++; 738 } else if ((mode&PROC_QUOTES) != 0) { 739 while (buffer[i] != '"' && i < endIndex) { 740 i++; 741 } 742 end = i; 743 i++; 744 } 745 while (i < endIndex && buffer[i] != term) { 746 i++; 747 } 748 if (end < 0) { 749 end = i; 750 } 751 752 if (i < endIndex) { 753 i++; 754 if ((mode&PROC_COMBINE) != 0) { 755 while (i < endIndex && buffer[i] == term) { 756 i++; 757 } 758 } 759 } 760 761 //ALOGI("Field %d: %d-%d dest=%d mode=0x%x\n", i, start, end, di, mode); 762 763 if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) { 764 char c = buffer[end]; 765 buffer[end] = 0; 766 if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) { 767 char* end; 768 floatsData[di] = strtof(buffer+start, &end); 769 } 770 if ((mode&PROC_OUT_LONG) != 0 && di < NL) { 771 char* end; 772 longsData[di] = strtoll(buffer+start, &end, 10); 773 } 774 if ((mode&PROC_OUT_STRING) != 0 && di < NS) { 775 jstring str = env->NewStringUTF(buffer+start); 776 env->SetObjectArrayElement(outStrings, di, str); 777 } 778 buffer[end] = c; 779 di++; 780 } 781 } 782 783 env->ReleaseIntArrayElements(format, formatData, 0); 784 if (longsData != NULL) { 785 env->ReleaseLongArrayElements(outLongs, longsData, 0); 786 } 787 if (floatsData != NULL) { 788 env->ReleaseFloatArrayElements(outFloats, floatsData, 0); 789 } 790 791 return res; 792} 793 794jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz, 795 jbyteArray buffer, jint startIndex, jint endIndex, jintArray format, 796 jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats) 797{ 798 jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL); 799 800 jboolean result = android_os_Process_parseProcLineArray(env, clazz, 801 (char*) bufferArray, startIndex, endIndex, format, outStrings, 802 outLongs, outFloats); 803 804 env->ReleaseByteArrayElements(buffer, bufferArray, 0); 805 806 return result; 807} 808 809jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz, 810 jstring file, jintArray format, jobjectArray outStrings, 811 jlongArray outLongs, jfloatArray outFloats) 812{ 813 if (file == NULL || format == NULL) { 814 jniThrowNullPointerException(env, NULL); 815 return JNI_FALSE; 816 } 817 818 const char* file8 = env->GetStringUTFChars(file, NULL); 819 if (file8 == NULL) { 820 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 821 return JNI_FALSE; 822 } 823 int fd = open(file8, O_RDONLY); 824 env->ReleaseStringUTFChars(file, file8); 825 826 if (fd < 0) { 827 //ALOGW("Unable to open process file: %s\n", file8); 828 return JNI_FALSE; 829 } 830 831 char buffer[256]; 832 const int len = read(fd, buffer, sizeof(buffer)-1); 833 close(fd); 834 835 if (len < 0) { 836 //ALOGW("Unable to open process file: %s fd=%d\n", file8, fd); 837 return JNI_FALSE; 838 } 839 buffer[len] = 0; 840 841 return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len, 842 format, outStrings, outLongs, outFloats); 843 844} 845 846void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz, 847 jobject binderObject) 848{ 849 if (binderObject == NULL) { 850 jniThrowNullPointerException(env, NULL); 851 return; 852 } 853 854 sp<IBinder> binder = ibinderForJavaObject(env, binderObject); 855} 856 857void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig) 858{ 859 if (pid > 0) { 860 ALOGI("Sending signal. PID: %d SIG: %d", pid, sig); 861 kill(pid, sig); 862 } 863} 864 865void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig) 866{ 867 if (pid > 0) { 868 kill(pid, sig); 869 } 870} 871 872static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz) 873{ 874 struct timespec ts; 875 876 int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts); 877 878 if (res != 0) { 879 return (jlong) 0; 880 } 881 882 nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec; 883 return (jlong) nanoseconds_to_milliseconds(when); 884} 885 886static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid) 887{ 888 char filename[64]; 889 890 snprintf(filename, sizeof(filename), "/proc/%d/smaps", pid); 891 892 FILE * file = fopen(filename, "r"); 893 if (!file) { 894 return (jlong) -1; 895 } 896 897 // Tally up all of the Pss from the various maps 898 char line[256]; 899 jlong pss = 0; 900 while (fgets(line, sizeof(line), file)) { 901 jlong v; 902 if (sscanf(line, "Pss: %lld kB", &v) == 1) { 903 pss += v; 904 } 905 } 906 907 fclose(file); 908 909 // Return the Pss value in bytes, not kilobytes 910 return pss * 1024; 911} 912 913jintArray android_os_Process_getPidsForCommands(JNIEnv* env, jobject clazz, 914 jobjectArray commandNames) 915{ 916 if (commandNames == NULL) { 917 jniThrowNullPointerException(env, NULL); 918 return NULL; 919 } 920 921 Vector<String8> commands; 922 923 jsize count = env->GetArrayLength(commandNames); 924 925 for (int i=0; i<count; i++) { 926 jobject obj = env->GetObjectArrayElement(commandNames, i); 927 if (obj != NULL) { 928 const char* str8 = env->GetStringUTFChars((jstring)obj, NULL); 929 if (str8 == NULL) { 930 jniThrowNullPointerException(env, "Element in commandNames"); 931 return NULL; 932 } 933 commands.add(String8(str8)); 934 env->ReleaseStringUTFChars((jstring)obj, str8); 935 } else { 936 jniThrowNullPointerException(env, "Element in commandNames"); 937 return NULL; 938 } 939 } 940 941 Vector<jint> pids; 942 943 DIR *proc = opendir("/proc"); 944 if (proc == NULL) { 945 fprintf(stderr, "/proc: %s\n", strerror(errno)); 946 return NULL; 947 } 948 949 struct dirent *d; 950 while ((d = readdir(proc))) { 951 int pid = atoi(d->d_name); 952 if (pid <= 0) continue; 953 954 char path[PATH_MAX]; 955 char data[PATH_MAX]; 956 snprintf(path, sizeof(path), "/proc/%d/cmdline", pid); 957 958 int fd = open(path, O_RDONLY); 959 if (fd < 0) { 960 continue; 961 } 962 const int len = read(fd, data, sizeof(data)-1); 963 close(fd); 964 965 if (len < 0) { 966 continue; 967 } 968 data[len] = 0; 969 970 for (int i=0; i<len; i++) { 971 if (data[i] == ' ') { 972 data[i] = 0; 973 break; 974 } 975 } 976 977 for (size_t i=0; i<commands.size(); i++) { 978 if (commands[i] == data) { 979 pids.add(pid); 980 break; 981 } 982 } 983 } 984 985 closedir(proc); 986 987 jintArray pidArray = env->NewIntArray(pids.size()); 988 if (pidArray == NULL) { 989 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 990 return NULL; 991 } 992 993 if (pids.size() > 0) { 994 env->SetIntArrayRegion(pidArray, 0, pids.size(), pids.array()); 995 } 996 997 return pidArray; 998} 999 1000static const JNINativeMethod methods[] = { 1001 {"getUidForName", "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName}, 1002 {"getGidForName", "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName}, 1003 {"setThreadPriority", "(II)V", (void*)android_os_Process_setThreadPriority}, 1004 {"setThreadScheduler", "(III)V", (void*)android_os_Process_setThreadScheduler}, 1005 {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground}, 1006 {"setThreadPriority", "(I)V", (void*)android_os_Process_setCallingThreadPriority}, 1007 {"getThreadPriority", "(I)I", (void*)android_os_Process_getThreadPriority}, 1008 {"setThreadGroup", "(II)V", (void*)android_os_Process_setThreadGroup}, 1009 {"setProcessGroup", "(II)V", (void*)android_os_Process_setProcessGroup}, 1010 {"getProcessGroup", "(I)I", (void*)android_os_Process_getProcessGroup}, 1011 {"setSwappiness", "(IZ)Z", (void*)android_os_Process_setSwappiness}, 1012 {"setArgV0", "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0}, 1013 {"setUid", "(I)I", (void*)android_os_Process_setUid}, 1014 {"setGid", "(I)I", (void*)android_os_Process_setGid}, 1015 {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal}, 1016 {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet}, 1017 {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory}, 1018 {"getTotalMemory", "()J", (void*)android_os_Process_getTotalMemory}, 1019 {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines}, 1020 {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids}, 1021 {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile}, 1022 {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine}, 1023 {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime}, 1024 {"getPss", "(I)J", (void*)android_os_Process_getPss}, 1025 {"getPidsForCommands", "([Ljava/lang/String;)[I", (void*)android_os_Process_getPidsForCommands}, 1026 //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject}, 1027}; 1028 1029const char* const kProcessPathName = "android/os/Process"; 1030 1031int register_android_os_Process(JNIEnv* env) 1032{ 1033 return AndroidRuntime::registerNativeMethods( 1034 env, kProcessPathName, 1035 methods, NELEM(methods)); 1036} 1037