android_util_Process.cpp revision 65b4a68669227a57696e0e7ed1e4ef8da2705d9e
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 51using namespace android; 52 53#if GUARD_THREAD_PRIORITY 54Mutex gKeyCreateMutex; 55static 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 60static 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 81static 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 102jint 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 133jint 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 164void 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 174void 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 261jint 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 270static 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, gettid()); 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 287void android_os_Process_setThreadScheduler(JNIEnv* env, jclass clazz, 288 jint tid, jint policy, jint pri) 289{ 290// linux has sched_setscheduler(), others don't. 291#if defined(__linux__) 292 struct sched_param param; 293 param.sched_priority = pri; 294 int rc = sched_setscheduler(tid, policy, ¶m); 295 if (rc) { 296 signalExceptionForPriorityError(env, errno); 297 } 298#else 299 signalExceptionForPriorityError(env, ENOSYS); 300#endif 301} 302 303void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz, 304 jint pid, jint pri) 305{ 306#if GUARD_THREAD_PRIORITY 307 // if we're putting the current thread into the background, check the TLS 308 // to make sure this thread isn't guarded. If it is, raise an exception. 309 if (pri >= ANDROID_PRIORITY_BACKGROUND) { 310 if (pid == gettid()) { 311 void* bgOk = pthread_getspecific(gBgKey); 312 if (bgOk == ((void*)0xbaad)) { 313 ALOGE("Thread marked fg-only put self in background!"); 314 jniThrowException(env, "java/lang/SecurityException", "May not put this thread into background"); 315 return; 316 } 317 } 318 } 319#endif 320 321 int rc = androidSetThreadPriority(pid, pri); 322 if (rc != 0) { 323 if (rc == INVALID_OPERATION) { 324 signalExceptionForPriorityError(env, errno); 325 } else { 326 signalExceptionForGroupError(env, errno); 327 } 328 } 329 330 //ALOGI("Setting priority of %" PRId32 ": %" PRId32 ", getpriority returns %d\n", 331 // pid, pri, getpriority(PRIO_PROCESS, pid)); 332} 333 334void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz, 335 jint pri) 336{ 337 android_os_Process_setThreadPriority(env, clazz, gettid(), pri); 338} 339 340jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz, 341 jint pid) 342{ 343 errno = 0; 344 jint pri = getpriority(PRIO_PROCESS, pid); 345 if (errno != 0) { 346 signalExceptionForPriorityError(env, errno); 347 } 348 //ALOGI("Returning priority of %" PRId32 ": %" PRId32 "\n", pid, pri); 349 return pri; 350} 351 352jboolean android_os_Process_setSwappiness(JNIEnv *env, jobject clazz, 353 jint pid, jboolean is_increased) 354{ 355 char text[64]; 356 357 if (is_increased) { 358 strcpy(text, "/sys/fs/cgroup/memory/sw/tasks"); 359 } else { 360 strcpy(text, "/sys/fs/cgroup/memory/tasks"); 361 } 362 363 struct stat st; 364 if (stat(text, &st) || !S_ISREG(st.st_mode)) { 365 return false; 366 } 367 368 int fd = open(text, O_WRONLY); 369 if (fd >= 0) { 370 sprintf(text, "%" PRId32, pid); 371 write(fd, text, strlen(text)); 372 close(fd); 373 } 374 375 return true; 376} 377 378void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name) 379{ 380 if (name == NULL) { 381 jniThrowNullPointerException(env, NULL); 382 return; 383 } 384 385 const jchar* str = env->GetStringCritical(name, 0); 386 String8 name8; 387 if (str) { 388 name8 = String8(str, env->GetStringLength(name)); 389 env->ReleaseStringCritical(name, str); 390 } 391 392 if (name8.size() > 0) { 393 const char* procName = name8.string(); 394 set_process_name(procName); 395 AndroidRuntime::getRuntime()->setArgv0(procName); 396 } 397} 398 399jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid) 400{ 401 return setuid(uid) == 0 ? 0 : errno; 402} 403 404jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid) 405{ 406 return setgid(uid) == 0 ? 0 : errno; 407} 408 409static int pid_compare(const void* v1, const void* v2) 410{ 411 //ALOGI("Compare %" PRId32 " vs %" PRId32 "\n", *((const jint*)v1), *((const jint*)v2)); 412 return *((const jint*)v1) - *((const jint*)v2); 413} 414 415static jlong getFreeMemoryImpl(const char* const sums[], const size_t sumsLen[], size_t num) 416{ 417 int fd = open("/proc/meminfo", O_RDONLY); 418 419 if (fd < 0) { 420 ALOGW("Unable to open /proc/meminfo"); 421 return -1; 422 } 423 424 char buffer[256]; 425 const int len = read(fd, buffer, sizeof(buffer)-1); 426 close(fd); 427 428 if (len < 0) { 429 ALOGW("Unable to read /proc/meminfo"); 430 return -1; 431 } 432 buffer[len] = 0; 433 434 size_t numFound = 0; 435 jlong mem = 0; 436 437 char* p = buffer; 438 while (*p && numFound < num) { 439 int i = 0; 440 while (sums[i]) { 441 if (strncmp(p, sums[i], sumsLen[i]) == 0) { 442 p += sumsLen[i]; 443 while (*p == ' ') p++; 444 char* num = p; 445 while (*p >= '0' && *p <= '9') p++; 446 if (*p != 0) { 447 *p = 0; 448 p++; 449 if (*p == 0) p--; 450 } 451 mem += atoll(num) * 1024; 452 numFound++; 453 break; 454 } 455 i++; 456 } 457 p++; 458 } 459 460 return numFound > 0 ? mem : -1; 461} 462 463static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz) 464{ 465 static const char* const sums[] = { "MemFree:", "Cached:", NULL }; 466 static const size_t sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), 0 }; 467 return getFreeMemoryImpl(sums, sumsLen, 2); 468} 469 470static jlong android_os_Process_getTotalMemory(JNIEnv* env, jobject clazz) 471{ 472 static const char* const sums[] = { "MemTotal:", NULL }; 473 static const size_t sumsLen[] = { strlen("MemTotal:"), 0 }; 474 return getFreeMemoryImpl(sums, sumsLen, 1); 475} 476 477void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr, 478 jobjectArray reqFields, jlongArray outFields) 479{ 480 //ALOGI("getMemInfo: %p %p", reqFields, outFields); 481 482 if (fileStr == NULL || reqFields == NULL || outFields == NULL) { 483 jniThrowNullPointerException(env, NULL); 484 return; 485 } 486 487 const char* file8 = env->GetStringUTFChars(fileStr, NULL); 488 if (file8 == NULL) { 489 return; 490 } 491 String8 file(file8); 492 env->ReleaseStringUTFChars(fileStr, file8); 493 494 jsize count = env->GetArrayLength(reqFields); 495 if (count > env->GetArrayLength(outFields)) { 496 jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ"); 497 return; 498 } 499 500 Vector<String8> fields; 501 int i; 502 503 for (i=0; i<count; i++) { 504 jobject obj = env->GetObjectArrayElement(reqFields, i); 505 if (obj != NULL) { 506 const char* str8 = env->GetStringUTFChars((jstring)obj, NULL); 507 //ALOGI("String at %d: %p = %s", i, obj, str8); 508 if (str8 == NULL) { 509 jniThrowNullPointerException(env, "Element in reqFields"); 510 return; 511 } 512 fields.add(String8(str8)); 513 env->ReleaseStringUTFChars((jstring)obj, str8); 514 } else { 515 jniThrowNullPointerException(env, "Element in reqFields"); 516 return; 517 } 518 } 519 520 jlong* sizesArray = env->GetLongArrayElements(outFields, 0); 521 if (sizesArray == NULL) { 522 return; 523 } 524 525 //ALOGI("Clearing %" PRId32 " sizes", count); 526 for (i=0; i<count; i++) { 527 sizesArray[i] = 0; 528 } 529 530 int fd = open(file.string(), O_RDONLY); 531 532 if (fd >= 0) { 533 const size_t BUFFER_SIZE = 2048; 534 char* buffer = (char*)malloc(BUFFER_SIZE); 535 int len = read(fd, buffer, BUFFER_SIZE-1); 536 close(fd); 537 538 if (len < 0) { 539 ALOGW("Unable to read %s", file.string()); 540 len = 0; 541 } 542 buffer[len] = 0; 543 544 int foundCount = 0; 545 546 char* p = buffer; 547 while (*p && foundCount < count) { 548 bool skipToEol = true; 549 //ALOGI("Parsing at: %s", p); 550 for (i=0; i<count; i++) { 551 const String8& field = fields[i]; 552 if (strncmp(p, field.string(), field.length()) == 0) { 553 p += field.length(); 554 while (*p == ' ' || *p == '\t') p++; 555 char* num = p; 556 while (*p >= '0' && *p <= '9') p++; 557 skipToEol = *p != '\n'; 558 if (*p != 0) { 559 *p = 0; 560 p++; 561 } 562 char* end; 563 sizesArray[i] = strtoll(num, &end, 10); 564 //ALOGI("Field %s = %" PRId64, field.string(), sizesArray[i]); 565 foundCount++; 566 break; 567 } 568 } 569 if (skipToEol) { 570 while (*p && *p != '\n') { 571 p++; 572 } 573 if (*p == '\n') { 574 p++; 575 } 576 } 577 } 578 579 free(buffer); 580 } else { 581 ALOGW("Unable to open %s", file.string()); 582 } 583 584 //ALOGI("Done!"); 585 env->ReleaseLongArrayElements(outFields, sizesArray, 0); 586} 587 588jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz, 589 jstring file, jintArray lastArray) 590{ 591 if (file == NULL) { 592 jniThrowNullPointerException(env, NULL); 593 return NULL; 594 } 595 596 const char* file8 = env->GetStringUTFChars(file, NULL); 597 if (file8 == NULL) { 598 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 599 return NULL; 600 } 601 602 DIR* dirp = opendir(file8); 603 604 env->ReleaseStringUTFChars(file, file8); 605 606 if(dirp == NULL) { 607 return NULL; 608 } 609 610 jsize curCount = 0; 611 jint* curData = NULL; 612 if (lastArray != NULL) { 613 curCount = env->GetArrayLength(lastArray); 614 curData = env->GetIntArrayElements(lastArray, 0); 615 } 616 617 jint curPos = 0; 618 619 struct dirent* entry; 620 while ((entry=readdir(dirp)) != NULL) { 621 const char* p = entry->d_name; 622 while (*p) { 623 if (*p < '0' || *p > '9') break; 624 p++; 625 } 626 if (*p != 0) continue; 627 628 char* end; 629 int pid = strtol(entry->d_name, &end, 10); 630 //ALOGI("File %s pid=%d\n", entry->d_name, pid); 631 if (curPos >= curCount) { 632 jsize newCount = (curCount == 0) ? 10 : (curCount*2); 633 jintArray newArray = env->NewIntArray(newCount); 634 if (newArray == NULL) { 635 closedir(dirp); 636 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 637 return NULL; 638 } 639 jint* newData = env->GetIntArrayElements(newArray, 0); 640 if (curData != NULL) { 641 memcpy(newData, curData, sizeof(jint)*curCount); 642 env->ReleaseIntArrayElements(lastArray, curData, 0); 643 } 644 lastArray = newArray; 645 curCount = newCount; 646 curData = newData; 647 } 648 649 curData[curPos] = pid; 650 curPos++; 651 } 652 653 closedir(dirp); 654 655 if (curData != NULL && curPos > 0) { 656 qsort(curData, curPos, sizeof(jint), pid_compare); 657 } 658 659 while (curPos < curCount) { 660 curData[curPos] = -1; 661 curPos++; 662 } 663 664 if (curData != NULL) { 665 env->ReleaseIntArrayElements(lastArray, curData, 0); 666 } 667 668 return lastArray; 669} 670 671enum { 672 PROC_TERM_MASK = 0xff, 673 PROC_ZERO_TERM = 0, 674 PROC_SPACE_TERM = ' ', 675 PROC_COMBINE = 0x100, 676 PROC_PARENS = 0x200, 677 PROC_QUOTES = 0x400, 678 PROC_OUT_STRING = 0x1000, 679 PROC_OUT_LONG = 0x2000, 680 PROC_OUT_FLOAT = 0x4000, 681}; 682 683jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz, 684 char* buffer, jint startIndex, jint endIndex, jintArray format, 685 jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats) 686{ 687 688 const jsize NF = env->GetArrayLength(format); 689 const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0; 690 const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0; 691 const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0; 692 693 jint* formatData = env->GetIntArrayElements(format, 0); 694 jlong* longsData = outLongs ? 695 env->GetLongArrayElements(outLongs, 0) : NULL; 696 jfloat* floatsData = outFloats ? 697 env->GetFloatArrayElements(outFloats, 0) : NULL; 698 if (formatData == NULL || (NL > 0 && longsData == NULL) 699 || (NR > 0 && floatsData == NULL)) { 700 if (formatData != NULL) { 701 env->ReleaseIntArrayElements(format, formatData, 0); 702 } 703 if (longsData != NULL) { 704 env->ReleaseLongArrayElements(outLongs, longsData, 0); 705 } 706 if (floatsData != NULL) { 707 env->ReleaseFloatArrayElements(outFloats, floatsData, 0); 708 } 709 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 710 return JNI_FALSE; 711 } 712 713 jsize i = startIndex; 714 jsize di = 0; 715 716 jboolean res = JNI_TRUE; 717 718 for (jsize fi=0; fi<NF; fi++) { 719 jint mode = formatData[fi]; 720 if ((mode&PROC_PARENS) != 0) { 721 i++; 722 } else if ((mode&PROC_QUOTES != 0)) { 723 if (buffer[i] == '"') { 724 i++; 725 } else { 726 mode &= ~PROC_QUOTES; 727 } 728 } 729 const char term = (char)(mode&PROC_TERM_MASK); 730 const jsize start = i; 731 if (i >= endIndex) { 732 DEBUG_PROC(ALOGW("Ran off end of data @%d", i)); 733 res = JNI_FALSE; 734 break; 735 } 736 737 jsize end = -1; 738 if ((mode&PROC_PARENS) != 0) { 739 while (i < endIndex && buffer[i] != ')') { 740 i++; 741 } 742 end = i; 743 i++; 744 } else if ((mode&PROC_QUOTES) != 0) { 745 while (buffer[i] != '"' && i < endIndex) { 746 i++; 747 } 748 end = i; 749 i++; 750 } 751 while (i < endIndex && buffer[i] != term) { 752 i++; 753 } 754 if (end < 0) { 755 end = i; 756 } 757 758 if (i < endIndex) { 759 i++; 760 if ((mode&PROC_COMBINE) != 0) { 761 while (i < endIndex && buffer[i] == term) { 762 i++; 763 } 764 } 765 } 766 767 //ALOGI("Field %" PRId32 ": %" PRId32 "-%" PRId32 " dest=%" PRId32 " mode=0x%" PRIx32 "\n", i, start, end, di, mode); 768 769 if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) { 770 char c = buffer[end]; 771 buffer[end] = 0; 772 if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) { 773 char* end; 774 floatsData[di] = strtof(buffer+start, &end); 775 } 776 if ((mode&PROC_OUT_LONG) != 0 && di < NL) { 777 char* end; 778 longsData[di] = strtoll(buffer+start, &end, 10); 779 } 780 if ((mode&PROC_OUT_STRING) != 0 && di < NS) { 781 jstring str = env->NewStringUTF(buffer+start); 782 env->SetObjectArrayElement(outStrings, di, str); 783 } 784 buffer[end] = c; 785 di++; 786 } 787 } 788 789 env->ReleaseIntArrayElements(format, formatData, 0); 790 if (longsData != NULL) { 791 env->ReleaseLongArrayElements(outLongs, longsData, 0); 792 } 793 if (floatsData != NULL) { 794 env->ReleaseFloatArrayElements(outFloats, floatsData, 0); 795 } 796 797 return res; 798} 799 800jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz, 801 jbyteArray buffer, jint startIndex, jint endIndex, jintArray format, 802 jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats) 803{ 804 jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL); 805 806 jboolean result = android_os_Process_parseProcLineArray(env, clazz, 807 (char*) bufferArray, startIndex, endIndex, format, outStrings, 808 outLongs, outFloats); 809 810 env->ReleaseByteArrayElements(buffer, bufferArray, 0); 811 812 return result; 813} 814 815jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz, 816 jstring file, jintArray format, jobjectArray outStrings, 817 jlongArray outLongs, jfloatArray outFloats) 818{ 819 if (file == NULL || format == NULL) { 820 jniThrowNullPointerException(env, NULL); 821 return JNI_FALSE; 822 } 823 824 const char* file8 = env->GetStringUTFChars(file, NULL); 825 if (file8 == NULL) { 826 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 827 return JNI_FALSE; 828 } 829 int fd = open(file8, O_RDONLY); 830 831 if (fd < 0) { 832 DEBUG_PROC(ALOGW("Unable to open process file: %s\n", file8)); 833 env->ReleaseStringUTFChars(file, file8); 834 return JNI_FALSE; 835 } 836 env->ReleaseStringUTFChars(file, file8); 837 838 char buffer[256]; 839 const int len = read(fd, buffer, sizeof(buffer)-1); 840 close(fd); 841 842 if (len < 0) { 843 DEBUG_PROC(ALOGW("Unable to open process file: %s fd=%d\n", file8, fd)); 844 return JNI_FALSE; 845 } 846 buffer[len] = 0; 847 848 return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len, 849 format, outStrings, outLongs, outFloats); 850 851} 852 853void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz, 854 jobject binderObject) 855{ 856 if (binderObject == NULL) { 857 jniThrowNullPointerException(env, NULL); 858 return; 859 } 860 861 sp<IBinder> binder = ibinderForJavaObject(env, binderObject); 862} 863 864void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig) 865{ 866 if (pid > 0) { 867 ALOGI("Sending signal. PID: %" PRId32 " SIG: %" PRId32, pid, sig); 868 kill(pid, sig); 869 } 870} 871 872void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig) 873{ 874 if (pid > 0) { 875 kill(pid, sig); 876 } 877} 878 879static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz) 880{ 881 struct timespec ts; 882 883 int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts); 884 885 if (res != 0) { 886 return (jlong) 0; 887 } 888 889 nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec; 890 return (jlong) nanoseconds_to_milliseconds(when); 891} 892 893static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid) 894{ 895 char filename[64]; 896 897 snprintf(filename, sizeof(filename), "/proc/%" PRId32 "/smaps", pid); 898 899 FILE * file = fopen(filename, "r"); 900 if (!file) { 901 return (jlong) -1; 902 } 903 904 // Tally up all of the Pss from the various maps 905 char line[256]; 906 jlong pss = 0; 907 while (fgets(line, sizeof(line), file)) { 908 jlong v; 909 if (sscanf(line, "Pss: %" SCNd64 " kB", &v) == 1) { 910 pss += v; 911 } 912 } 913 914 fclose(file); 915 916 // Return the Pss value in bytes, not kilobytes 917 return pss * 1024; 918} 919 920jintArray android_os_Process_getPidsForCommands(JNIEnv* env, jobject clazz, 921 jobjectArray commandNames) 922{ 923 if (commandNames == NULL) { 924 jniThrowNullPointerException(env, NULL); 925 return NULL; 926 } 927 928 Vector<String8> commands; 929 930 jsize count = env->GetArrayLength(commandNames); 931 932 for (int i=0; i<count; i++) { 933 jobject obj = env->GetObjectArrayElement(commandNames, i); 934 if (obj != NULL) { 935 const char* str8 = env->GetStringUTFChars((jstring)obj, NULL); 936 if (str8 == NULL) { 937 jniThrowNullPointerException(env, "Element in commandNames"); 938 return NULL; 939 } 940 commands.add(String8(str8)); 941 env->ReleaseStringUTFChars((jstring)obj, str8); 942 } else { 943 jniThrowNullPointerException(env, "Element in commandNames"); 944 return NULL; 945 } 946 } 947 948 Vector<jint> pids; 949 950 DIR *proc = opendir("/proc"); 951 if (proc == NULL) { 952 fprintf(stderr, "/proc: %s\n", strerror(errno)); 953 return NULL; 954 } 955 956 struct dirent *d; 957 while ((d = readdir(proc))) { 958 int pid = atoi(d->d_name); 959 if (pid <= 0) continue; 960 961 char path[PATH_MAX]; 962 char data[PATH_MAX]; 963 snprintf(path, sizeof(path), "/proc/%d/cmdline", pid); 964 965 int fd = open(path, O_RDONLY); 966 if (fd < 0) { 967 continue; 968 } 969 const int len = read(fd, data, sizeof(data)-1); 970 close(fd); 971 972 if (len < 0) { 973 continue; 974 } 975 data[len] = 0; 976 977 for (int i=0; i<len; i++) { 978 if (data[i] == ' ') { 979 data[i] = 0; 980 break; 981 } 982 } 983 984 for (size_t i=0; i<commands.size(); i++) { 985 if (commands[i] == data) { 986 pids.add(pid); 987 break; 988 } 989 } 990 } 991 992 closedir(proc); 993 994 jintArray pidArray = env->NewIntArray(pids.size()); 995 if (pidArray == NULL) { 996 jniThrowException(env, "java/lang/OutOfMemoryError", NULL); 997 return NULL; 998 } 999 1000 if (pids.size() > 0) { 1001 env->SetIntArrayRegion(pidArray, 0, pids.size(), pids.array()); 1002 } 1003 1004 return pidArray; 1005} 1006 1007jint android_os_Process_killProcessGroup(JNIEnv* env, jobject clazz, jint uid, jint pid) 1008{ 1009 return killProcessGroup(uid, pid, SIGKILL); 1010} 1011 1012void android_os_Process_removeAllProcessGroups(JNIEnv* env, jobject clazz) 1013{ 1014 return removeAllProcessGroups(); 1015} 1016 1017static const JNINativeMethod methods[] = { 1018 {"getUidForName", "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName}, 1019 {"getGidForName", "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName}, 1020 {"setThreadPriority", "(II)V", (void*)android_os_Process_setThreadPriority}, 1021 {"setThreadScheduler", "(III)V", (void*)android_os_Process_setThreadScheduler}, 1022 {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground}, 1023 {"setThreadPriority", "(I)V", (void*)android_os_Process_setCallingThreadPriority}, 1024 {"getThreadPriority", "(I)I", (void*)android_os_Process_getThreadPriority}, 1025 {"setThreadGroup", "(II)V", (void*)android_os_Process_setThreadGroup}, 1026 {"setProcessGroup", "(II)V", (void*)android_os_Process_setProcessGroup}, 1027 {"getProcessGroup", "(I)I", (void*)android_os_Process_getProcessGroup}, 1028 {"setSwappiness", "(IZ)Z", (void*)android_os_Process_setSwappiness}, 1029 {"setArgV0", "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0}, 1030 {"setUid", "(I)I", (void*)android_os_Process_setUid}, 1031 {"setGid", "(I)I", (void*)android_os_Process_setGid}, 1032 {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal}, 1033 {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet}, 1034 {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory}, 1035 {"getTotalMemory", "()J", (void*)android_os_Process_getTotalMemory}, 1036 {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines}, 1037 {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids}, 1038 {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile}, 1039 {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine}, 1040 {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime}, 1041 {"getPss", "(I)J", (void*)android_os_Process_getPss}, 1042 {"getPidsForCommands", "([Ljava/lang/String;)[I", (void*)android_os_Process_getPidsForCommands}, 1043 //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject}, 1044 {"killProcessGroup", "(II)I", (void*)android_os_Process_killProcessGroup}, 1045 {"removeAllProcessGroups", "()V", (void*)android_os_Process_removeAllProcessGroups}, 1046}; 1047 1048const char* const kProcessPathName = "android/os/Process"; 1049 1050int register_android_os_Process(JNIEnv* env) 1051{ 1052 return AndroidRuntime::registerNativeMethods( 1053 env, kProcessPathName, 1054 methods, NELEM(methods)); 1055} 1056