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 #include <processgroup/processgroup.h> 28 29 #include <android_runtime/AndroidRuntime.h> 30 31 #include "android_util_Binder.h" 32 #include "JNIHelp.h" 33 34 #include <dirent.h> 35 #include <fcntl.h> 36 #include <grp.h> 37 #include <inttypes.h> 38 #include <pwd.h> 39 #include <signal.h> 40 #include <sys/errno.h> 41 #include <sys/resource.h> 42 #include <sys/stat.h> 43 #include <sys/types.h> 44 #include <unistd.h> 45 46 #define POLICY_DEBUG 0 47 #define GUARD_THREAD_PRIORITY 0 48 49 #define DEBUG_PROC(x) //x 50 51 using namespace android; 52 53 #if GUARD_THREAD_PRIORITY 54 Mutex gKeyCreateMutex; 55 static pthread_key_t gBgKey = -1; 56 #endif 57 58 // For both of these, err should be in the errno range (positive), not a status_t (negative) 59 60 static void signalExceptionForPriorityError(JNIEnv* env, int err) 61 { 62 switch (err) { 63 case EINVAL: 64 jniThrowException(env, "java/lang/IllegalArgumentException", NULL); 65 break; 66 case ESRCH: 67 jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist"); 68 break; 69 case EPERM: 70 jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread"); 71 break; 72 case EACCES: 73 jniThrowException(env, "java/lang/SecurityException", "No permission to set to given priority"); 74 break; 75 default: 76 jniThrowException(env, "java/lang/RuntimeException", "Unknown error"); 77 break; 78 } 79 } 80 81 static void signalExceptionForGroupError(JNIEnv* env, int err) 82 { 83 switch (err) { 84 case EINVAL: 85 jniThrowException(env, "java/lang/IllegalArgumentException", NULL); 86 break; 87 case ESRCH: 88 jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist"); 89 break; 90 case EPERM: 91 jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread"); 92 break; 93 case EACCES: 94 jniThrowException(env, "java/lang/SecurityException", "No permission to set to given group"); 95 break; 96 default: 97 jniThrowException(env, "java/lang/RuntimeException", "Unknown error"); 98 break; 99 } 100 } 101 102 jint android_os_Process_getUidForName(JNIEnv* env, jobject clazz, jstring name) 103 { 104 if (name == NULL) { 105 jniThrowNullPointerException(env, NULL); 106 return -1; 107 } 108 109 const jchar* str16 = env->GetStringCritical(name, 0); 110 String8 name8; 111 if (str16) { 112 name8 = String8(str16, env->GetStringLength(name)); 113 env->ReleaseStringCritical(name, str16); 114 } 115 116 const size_t N = name8.size(); 117 if (N > 0) { 118 const char* str = name8.string(); 119 for (size_t i=0; i<N; i++) { 120 if (str[i] < '0' || str[i] > '9') { 121 struct passwd* pwd = getpwnam(str); 122 if (pwd == NULL) { 123 return -1; 124 } 125 return pwd->pw_uid; 126 } 127 } 128 return atoi(str); 129 } 130 return -1; 131 } 132 133 jint android_os_Process_getGidForName(JNIEnv* env, jobject clazz, jstring name) 134 { 135 if (name == NULL) { 136 jniThrowNullPointerException(env, NULL); 137 return -1; 138 } 139 140 const jchar* str16 = env->GetStringCritical(name, 0); 141 String8 name8; 142 if (str16) { 143 name8 = String8(str16, env->GetStringLength(name)); 144 env->ReleaseStringCritical(name, str16); 145 } 146 147 const size_t N = name8.size(); 148 if (N > 0) { 149 const char* str = name8.string(); 150 for (size_t i=0; i<N; i++) { 151 if (str[i] < '0' || str[i] > '9') { 152 struct group* grp = getgrnam(str); 153 if (grp == NULL) { 154 return -1; 155 } 156 return grp->gr_gid; 157 } 158 } 159 return atoi(str); 160 } 161 return -1; 162 } 163 164 void android_os_Process_setThreadGroup(JNIEnv* env, jobject clazz, int tid, jint grp) 165 { 166 ALOGV("%s tid=%d grp=%" PRId32, __func__, tid, grp); 167 SchedPolicy sp = (SchedPolicy) grp; 168 int res = set_sched_policy(tid, sp); 169 if (res != NO_ERROR) { 170 signalExceptionForGroupError(env, -res); 171 } 172 } 173 174 void android_os_Process_setProcessGroup(JNIEnv* env, jobject clazz, int pid, jint grp) 175 { 176 ALOGV("%s pid=%d grp=%" PRId32, __func__, pid, grp); 177 DIR *d; 178 FILE *fp; 179 char proc_path[255]; 180 struct dirent *de; 181 182 if ((grp == SP_FOREGROUND) || (grp > SP_MAX)) { 183 signalExceptionForGroupError(env, EINVAL); 184 return; 185 } 186 187 bool isDefault = false; 188 if (grp < 0) { 189 grp = SP_FOREGROUND; 190 isDefault = true; 191 } 192 SchedPolicy sp = (SchedPolicy) grp; 193 194 #if POLICY_DEBUG 195 char cmdline[32]; 196 int fd; 197 198 strcpy(cmdline, "unknown"); 199 200 sprintf(proc_path, "/proc/%d/cmdline", pid); 201 fd = open(proc_path, O_RDONLY); 202 if (fd >= 0) { 203 int rc = read(fd, cmdline, sizeof(cmdline)-1); 204 cmdline[rc] = 0; 205 close(fd); 206 } 207 208 if (sp == SP_BACKGROUND) { 209 ALOGD("setProcessGroup: vvv pid %d (%s)", pid, cmdline); 210 } else { 211 ALOGD("setProcessGroup: ^^^ pid %d (%s)", pid, cmdline); 212 } 213 #endif 214 sprintf(proc_path, "/proc/%d/task", pid); 215 if (!(d = opendir(proc_path))) { 216 // If the process exited on us, don't generate an exception 217 if (errno != ENOENT) 218 signalExceptionForGroupError(env, errno); 219 return; 220 } 221 222 while ((de = readdir(d))) { 223 int t_pid; 224 int t_pri; 225 226 if (de->d_name[0] == '.') 227 continue; 228 t_pid = atoi(de->d_name); 229 230 if (!t_pid) { 231 ALOGE("Error getting pid for '%s'\n", de->d_name); 232 continue; 233 } 234 235 t_pri = getpriority(PRIO_PROCESS, t_pid); 236 237 if (t_pri <= ANDROID_PRIORITY_AUDIO) { 238 int scheduler = sched_getscheduler(t_pid); 239 if ((scheduler == SCHED_FIFO) || (scheduler == SCHED_RR)) { 240 // This task wants to stay in it's current audio group so it can keep it's budget 241 continue; 242 } 243 } 244 245 if (isDefault) { 246 if (t_pri >= ANDROID_PRIORITY_BACKGROUND) { 247 // This task wants to stay at background 248 continue; 249 } 250 } 251 252 int err = set_sched_policy(t_pid, sp); 253 if (err != NO_ERROR) { 254 signalExceptionForGroupError(env, -err); 255 break; 256 } 257 } 258 closedir(d); 259 } 260 261 jint android_os_Process_getProcessGroup(JNIEnv* env, jobject clazz, jint pid) 262 { 263 SchedPolicy sp; 264 if (get_sched_policy(pid, &sp) != 0) { 265 signalExceptionForGroupError(env, errno); 266 } 267 return (int) sp; 268 } 269 270 static void android_os_Process_setCanSelfBackground(JNIEnv* env, jobject clazz, jboolean bgOk) { 271 // Establishes the calling thread as illegal to put into the background. 272 // Typically used only for the system process's main looper. 273 #if GUARD_THREAD_PRIORITY 274 ALOGV("Process.setCanSelfBackground(%d) : tid=%d", bgOk, androidGetTid()); 275 { 276 Mutex::Autolock _l(gKeyCreateMutex); 277 if (gBgKey == -1) { 278 pthread_key_create(&gBgKey, NULL); 279 } 280 } 281 282 // inverted: not-okay, we set a sentinel value 283 pthread_setspecific(gBgKey, (void*)(bgOk ? 0 : 0xbaad)); 284 #endif 285 } 286 287 void android_os_Process_setThreadScheduler(JNIEnv* env, jclass clazz, 288 jint tid, jint policy, jint pri) 289 { 290 #ifdef HAVE_SCHED_SETSCHEDULER 291 struct sched_param param; 292 param.sched_priority = pri; 293 int rc = sched_setscheduler(tid, policy, ¶m); 294 if (rc) { 295 signalExceptionForPriorityError(env, errno); 296 } 297 #else 298 signalExceptionForPriorityError(env, ENOSYS); 299 #endif 300 } 301 302 void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz, 303 jint pid, jint pri) 304 { 305 #if GUARD_THREAD_PRIORITY 306 // if we're putting the current thread into the background, check the TLS 307 // to make sure this thread isn't guarded. If it is, raise an exception. 308 if (pri >= ANDROID_PRIORITY_BACKGROUND) { 309 if (pid == androidGetTid()) { 310 void* bgOk = pthread_getspecific(gBgKey); 311 if (bgOk == ((void*)0xbaad)) { 312 ALOGE("Thread marked fg-only put self in background!"); 313 jniThrowException(env, "java/lang/SecurityException", "May not put this thread into background"); 314 return; 315 } 316 } 317 } 318 #endif 319 320 int rc = androidSetThreadPriority(pid, pri); 321 if (rc != 0) { 322 if (rc == INVALID_OPERATION) { 323 signalExceptionForPriorityError(env, errno); 324 } else { 325 signalExceptionForGroupError(env, errno); 326 } 327 } 328 329 //ALOGI("Setting priority of %" PRId32 ": %" PRId32 ", getpriority returns %d\n", 330 // pid, pri, getpriority(PRIO_PROCESS, pid)); 331 } 332 333 void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz, 334 jint pri) 335 { 336 android_os_Process_setThreadPriority(env, clazz, androidGetTid(), pri); 337 } 338 339 jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz, 340 jint pid) 341 { 342 errno = 0; 343 jint pri = getpriority(PRIO_PROCESS, pid); 344 if (errno != 0) { 345 signalExceptionForPriorityError(env, errno); 346 } 347 //ALOGI("Returning priority of %" PRId32 ": %" PRId32 "\n", pid, pri); 348 return pri; 349 } 350 351 jboolean android_os_Process_setSwappiness(JNIEnv *env, jobject clazz, 352 jint pid, jboolean is_increased) 353 { 354 char text[64]; 355 356 if (is_increased) { 357 strcpy(text, "/sys/fs/cgroup/memory/sw/tasks"); 358 } else { 359 strcpy(text, "/sys/fs/cgroup/memory/tasks"); 360 } 361 362 struct stat st; 363 if (stat(text, &st) || !S_ISREG(st.st_mode)) { 364 return false; 365 } 366 367 int fd = open(text, O_WRONLY); 368 if (fd >= 0) { 369 sprintf(text, "%" PRId32, pid); 370 write(fd, text, strlen(text)); 371 close(fd); 372 } 373 374 return true; 375 } 376 377 void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name) 378 { 379 if (name == NULL) { 380 jniThrowNullPointerException(env, NULL); 381 return; 382 } 383 384 const jchar* str = env->GetStringCritical(name, 0); 385 String8 name8; 386 if (str) { 387 name8 = String8(str, env->GetStringLength(name)); 388 env->ReleaseStringCritical(name, str); 389 } 390 391 if (name8.size() > 0) { 392 const char* procName = name8.string(); 393 set_process_name(procName); 394 AndroidRuntime::getRuntime()->setArgv0(procName); 395 } 396 } 397 398 jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid) 399 { 400 return setuid(uid) == 0 ? 0 : errno; 401 } 402 403 jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid) 404 { 405 return setgid(uid) == 0 ? 0 : errno; 406 } 407 408 static int pid_compare(const void* v1, const void* v2) 409 { 410 //ALOGI("Compare %" PRId32 " vs %" PRId32 "\n", *((const jint*)v1), *((const jint*)v2)); 411 return *((const jint*)v1) - *((const jint*)v2); 412 } 413 414 static jlong getFreeMemoryImpl(const char* const sums[], const size_t sumsLen[], size_t 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 size_t 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 } 461 462 static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz) 463 { 464 static const char* const sums[] = { "MemFree:", "Cached:", NULL }; 465 static const size_t sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), 0 }; 466 return getFreeMemoryImpl(sums, sumsLen, 2); 467 } 468 469 static jlong android_os_Process_getTotalMemory(JNIEnv* env, jobject clazz) 470 { 471 static const char* const sums[] = { "MemTotal:", NULL }; 472 static const size_t sumsLen[] = { strlen("MemTotal:"), 0 }; 473 return getFreeMemoryImpl(sums, sumsLen, 1); 474 } 475 476 void 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 %" PRId32 " 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 = %" PRId64, 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 } 586 587 jintArray 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 } 669 670 enum { 671 PROC_TERM_MASK = 0xff, 672 PROC_ZERO_TERM = 0, 673 PROC_SPACE_TERM = ' ', 674 PROC_COMBINE = 0x100, 675 PROC_PARENS = 0x200, 676 PROC_QUOTES = 0x400, 677 PROC_OUT_STRING = 0x1000, 678 PROC_OUT_LONG = 0x2000, 679 PROC_OUT_FLOAT = 0x4000, 680 }; 681 682 jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz, 683 char* buffer, jint startIndex, jint endIndex, jintArray format, 684 jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats) 685 { 686 687 const jsize NF = env->GetArrayLength(format); 688 const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0; 689 const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0; 690 const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0; 691 692 jint* formatData = env->GetIntArrayElements(format, 0); 693 jlong* longsData = outLongs ? 694 env->GetLongArrayElements(outLongs, 0) : NULL; 695 jfloat* floatsData = outFloats ? 696 env->GetFloatArrayElements(outFloats, 0) : NULL; 697 if (formatData == NULL || (NL > 0 && longsData == NULL) 698 || (NR > 0 && floatsData == NULL)) { 699 if (formatData != NULL) { 700 env->ReleaseIntArrayElements(format, formatData, 0); 701 } 702 if (longsData != NULL) { 703 env->ReleaseLongArrayElements(outLongs, longsData, 0); 704 } 705 if (floatsData != NULL) { 706 env->ReleaseFloatArrayElements(outFloats, floatsData, 0); 707 } 708 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 709 return JNI_FALSE; 710 } 711 712 jsize i = startIndex; 713 jsize di = 0; 714 715 jboolean res = JNI_TRUE; 716 717 for (jsize fi=0; fi<NF; fi++) { 718 jint mode = formatData[fi]; 719 if ((mode&PROC_PARENS) != 0) { 720 i++; 721 } else if ((mode&PROC_QUOTES != 0)) { 722 if (buffer[i] == '"') { 723 i++; 724 } else { 725 mode &= ~PROC_QUOTES; 726 } 727 } 728 const char term = (char)(mode&PROC_TERM_MASK); 729 const jsize start = i; 730 if (i >= endIndex) { 731 DEBUG_PROC(ALOGW("Ran off end of data @%d", i)); 732 res = JNI_FALSE; 733 break; 734 } 735 736 jsize end = -1; 737 if ((mode&PROC_PARENS) != 0) { 738 while (i < endIndex && buffer[i] != ')') { 739 i++; 740 } 741 end = i; 742 i++; 743 } else if ((mode&PROC_QUOTES) != 0) { 744 while (buffer[i] != '"' && i < endIndex) { 745 i++; 746 } 747 end = i; 748 i++; 749 } 750 while (i < endIndex && buffer[i] != term) { 751 i++; 752 } 753 if (end < 0) { 754 end = i; 755 } 756 757 if (i < endIndex) { 758 i++; 759 if ((mode&PROC_COMBINE) != 0) { 760 while (i < endIndex && buffer[i] == term) { 761 i++; 762 } 763 } 764 } 765 766 //ALOGI("Field %" PRId32 ": %" PRId32 "-%" PRId32 " dest=%" PRId32 " mode=0x%" PRIx32 "\n", i, start, end, di, mode); 767 768 if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) { 769 char c = buffer[end]; 770 buffer[end] = 0; 771 if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) { 772 char* end; 773 floatsData[di] = strtof(buffer+start, &end); 774 } 775 if ((mode&PROC_OUT_LONG) != 0 && di < NL) { 776 char* end; 777 longsData[di] = strtoll(buffer+start, &end, 10); 778 } 779 if ((mode&PROC_OUT_STRING) != 0 && di < NS) { 780 jstring str = env->NewStringUTF(buffer+start); 781 env->SetObjectArrayElement(outStrings, di, str); 782 } 783 buffer[end] = c; 784 di++; 785 } 786 } 787 788 env->ReleaseIntArrayElements(format, formatData, 0); 789 if (longsData != NULL) { 790 env->ReleaseLongArrayElements(outLongs, longsData, 0); 791 } 792 if (floatsData != NULL) { 793 env->ReleaseFloatArrayElements(outFloats, floatsData, 0); 794 } 795 796 return res; 797 } 798 799 jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz, 800 jbyteArray buffer, jint startIndex, jint endIndex, jintArray format, 801 jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats) 802 { 803 jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL); 804 805 jboolean result = android_os_Process_parseProcLineArray(env, clazz, 806 (char*) bufferArray, startIndex, endIndex, format, outStrings, 807 outLongs, outFloats); 808 809 env->ReleaseByteArrayElements(buffer, bufferArray, 0); 810 811 return result; 812 } 813 814 jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz, 815 jstring file, jintArray format, jobjectArray outStrings, 816 jlongArray outLongs, jfloatArray outFloats) 817 { 818 if (file == NULL || format == NULL) { 819 jniThrowNullPointerException(env, NULL); 820 return JNI_FALSE; 821 } 822 823 const char* file8 = env->GetStringUTFChars(file, NULL); 824 if (file8 == NULL) { 825 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 826 return JNI_FALSE; 827 } 828 int fd = open(file8, O_RDONLY); 829 830 if (fd < 0) { 831 DEBUG_PROC(ALOGW("Unable to open process file: %s\n", file8)); 832 env->ReleaseStringUTFChars(file, file8); 833 return JNI_FALSE; 834 } 835 env->ReleaseStringUTFChars(file, file8); 836 837 char buffer[256]; 838 const int len = read(fd, buffer, sizeof(buffer)-1); 839 close(fd); 840 841 if (len < 0) { 842 DEBUG_PROC(ALOGW("Unable to open process file: %s fd=%d\n", file8, fd)); 843 return JNI_FALSE; 844 } 845 buffer[len] = 0; 846 847 return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len, 848 format, outStrings, outLongs, outFloats); 849 850 } 851 852 void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz, 853 jobject binderObject) 854 { 855 if (binderObject == NULL) { 856 jniThrowNullPointerException(env, NULL); 857 return; 858 } 859 860 sp<IBinder> binder = ibinderForJavaObject(env, binderObject); 861 } 862 863 void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig) 864 { 865 if (pid > 0) { 866 ALOGI("Sending signal. PID: %" PRId32 " SIG: %" PRId32, pid, sig); 867 kill(pid, sig); 868 } 869 } 870 871 void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig) 872 { 873 if (pid > 0) { 874 kill(pid, sig); 875 } 876 } 877 878 static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz) 879 { 880 struct timespec ts; 881 882 int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts); 883 884 if (res != 0) { 885 return (jlong) 0; 886 } 887 888 nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec; 889 return (jlong) nanoseconds_to_milliseconds(when); 890 } 891 892 static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid) 893 { 894 char filename[64]; 895 896 snprintf(filename, sizeof(filename), "/proc/%" PRId32 "/smaps", pid); 897 898 FILE * file = fopen(filename, "r"); 899 if (!file) { 900 return (jlong) -1; 901 } 902 903 // Tally up all of the Pss from the various maps 904 char line[256]; 905 jlong pss = 0; 906 while (fgets(line, sizeof(line), file)) { 907 jlong v; 908 if (sscanf(line, "Pss: %" SCNd64 " kB", &v) == 1) { 909 pss += v; 910 } 911 } 912 913 fclose(file); 914 915 // Return the Pss value in bytes, not kilobytes 916 return pss * 1024; 917 } 918 919 jintArray android_os_Process_getPidsForCommands(JNIEnv* env, jobject clazz, 920 jobjectArray commandNames) 921 { 922 if (commandNames == NULL) { 923 jniThrowNullPointerException(env, NULL); 924 return NULL; 925 } 926 927 Vector<String8> commands; 928 929 jsize count = env->GetArrayLength(commandNames); 930 931 for (int i=0; i<count; i++) { 932 jobject obj = env->GetObjectArrayElement(commandNames, i); 933 if (obj != NULL) { 934 const char* str8 = env->GetStringUTFChars((jstring)obj, NULL); 935 if (str8 == NULL) { 936 jniThrowNullPointerException(env, "Element in commandNames"); 937 return NULL; 938 } 939 commands.add(String8(str8)); 940 env->ReleaseStringUTFChars((jstring)obj, str8); 941 } else { 942 jniThrowNullPointerException(env, "Element in commandNames"); 943 return NULL; 944 } 945 } 946 947 Vector<jint> pids; 948 949 DIR *proc = opendir("/proc"); 950 if (proc == NULL) { 951 fprintf(stderr, "/proc: %s\n", strerror(errno)); 952 return NULL; 953 } 954 955 struct dirent *d; 956 while ((d = readdir(proc))) { 957 int pid = atoi(d->d_name); 958 if (pid <= 0) continue; 959 960 char path[PATH_MAX]; 961 char data[PATH_MAX]; 962 snprintf(path, sizeof(path), "/proc/%d/cmdline", pid); 963 964 int fd = open(path, O_RDONLY); 965 if (fd < 0) { 966 continue; 967 } 968 const int len = read(fd, data, sizeof(data)-1); 969 close(fd); 970 971 if (len < 0) { 972 continue; 973 } 974 data[len] = 0; 975 976 for (int i=0; i<len; i++) { 977 if (data[i] == ' ') { 978 data[i] = 0; 979 break; 980 } 981 } 982 983 for (size_t i=0; i<commands.size(); i++) { 984 if (commands[i] == data) { 985 pids.add(pid); 986 break; 987 } 988 } 989 } 990 991 closedir(proc); 992 993 jintArray pidArray = env->NewIntArray(pids.size()); 994 if (pidArray == NULL) { 995 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 996 return NULL; 997 } 998 999 if (pids.size() > 0) { 1000 env->SetIntArrayRegion(pidArray, 0, pids.size(), pids.array()); 1001 } 1002 1003 return pidArray; 1004 } 1005 1006 jint android_os_Process_killProcessGroup(JNIEnv* env, jobject clazz, jint uid, jint pid) 1007 { 1008 return killProcessGroup(uid, pid, SIGKILL); 1009 } 1010 1011 void android_os_Process_removeAllProcessGroups(JNIEnv* env, jobject clazz) 1012 { 1013 return removeAllProcessGroups(); 1014 } 1015 1016 static const JNINativeMethod methods[] = { 1017 {"getUidForName", "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName}, 1018 {"getGidForName", "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName}, 1019 {"setThreadPriority", "(II)V", (void*)android_os_Process_setThreadPriority}, 1020 {"setThreadScheduler", "(III)V", (void*)android_os_Process_setThreadScheduler}, 1021 {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground}, 1022 {"setThreadPriority", "(I)V", (void*)android_os_Process_setCallingThreadPriority}, 1023 {"getThreadPriority", "(I)I", (void*)android_os_Process_getThreadPriority}, 1024 {"setThreadGroup", "(II)V", (void*)android_os_Process_setThreadGroup}, 1025 {"setProcessGroup", "(II)V", (void*)android_os_Process_setProcessGroup}, 1026 {"getProcessGroup", "(I)I", (void*)android_os_Process_getProcessGroup}, 1027 {"setSwappiness", "(IZ)Z", (void*)android_os_Process_setSwappiness}, 1028 {"setArgV0", "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0}, 1029 {"setUid", "(I)I", (void*)android_os_Process_setUid}, 1030 {"setGid", "(I)I", (void*)android_os_Process_setGid}, 1031 {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal}, 1032 {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet}, 1033 {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory}, 1034 {"getTotalMemory", "()J", (void*)android_os_Process_getTotalMemory}, 1035 {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines}, 1036 {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids}, 1037 {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile}, 1038 {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine}, 1039 {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime}, 1040 {"getPss", "(I)J", (void*)android_os_Process_getPss}, 1041 {"getPidsForCommands", "([Ljava/lang/String;)[I", (void*)android_os_Process_getPidsForCommands}, 1042 //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject}, 1043 {"killProcessGroup", "(II)I", (void*)android_os_Process_killProcessGroup}, 1044 {"removeAllProcessGroups", "()V", (void*)android_os_Process_removeAllProcessGroups}, 1045 }; 1046 1047 const char* const kProcessPathName = "android/os/Process"; 1048 1049 int register_android_os_Process(JNIEnv* env) 1050 { 1051 return AndroidRuntime::registerNativeMethods( 1052 env, kProcessPathName, 1053 methods, NELEM(methods)); 1054 } 1055