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      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 
     46 using namespace android;
     47 
     48 #if GUARD_THREAD_PRIORITY
     49 Mutex gKeyCreateMutex;
     50 static 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 
     55 static 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 
     76 static 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 
     97 jint android_os_Process_myPid(JNIEnv* env, jobject clazz)
     98 {
     99     return getpid();
    100 }
    101 
    102 jint android_os_Process_myUid(JNIEnv* env, jobject clazz)
    103 {
    104     return getuid();
    105 }
    106 
    107 jint android_os_Process_myTid(JNIEnv* env, jobject clazz)
    108 {
    109     return androidGetTid();
    110 }
    111 
    112 jint 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 
    143 jint 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 
    174 void 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 
    184 void 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 
    271 static void android_os_Process_setCanSelfBackground(JNIEnv* env, jobject clazz, jboolean bgOk) {
    272     // Establishes the calling thread as illegal to put into the background.
    273     // Typically used only for the system process's main looper.
    274 #if GUARD_THREAD_PRIORITY
    275     ALOGV("Process.setCanSelfBackground(%d) : tid=%d", bgOk, androidGetTid());
    276     {
    277         Mutex::Autolock _l(gKeyCreateMutex);
    278         if (gBgKey == -1) {
    279             pthread_key_create(&gBgKey, NULL);
    280         }
    281     }
    282 
    283     // inverted:  not-okay, we set a sentinel value
    284     pthread_setspecific(gBgKey, (void*)(bgOk ? 0 : 0xbaad));
    285 #endif
    286 }
    287 
    288 void android_os_Process_setThreadScheduler(JNIEnv* env, jclass clazz,
    289                                               jint tid, jint policy, jint pri)
    290 {
    291 #ifdef HAVE_SCHED_SETSCHEDULER
    292     struct sched_param param;
    293     param.sched_priority = pri;
    294     int rc = sched_setscheduler(tid, policy, &param);
    295     if (rc) {
    296         signalExceptionForPriorityError(env, errno);
    297     }
    298 #else
    299     signalExceptionForPriorityError(env, ENOSYS);
    300 #endif
    301 }
    302 
    303 void 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 == androidGetTid()) {
    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 %d: %d, getpriority returns %d\n",
    331     //     pid, pri, getpriority(PRIO_PROCESS, pid));
    332 }
    333 
    334 void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz,
    335                                                         jint pri)
    336 {
    337     jint tid = android_os_Process_myTid(env, clazz);
    338     android_os_Process_setThreadPriority(env, clazz, tid, pri);
    339 }
    340 
    341 jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz,
    342                                               jint pid)
    343 {
    344     errno = 0;
    345     jint pri = getpriority(PRIO_PROCESS, pid);
    346     if (errno != 0) {
    347         signalExceptionForPriorityError(env, errno);
    348     }
    349     //ALOGI("Returning priority of %d: %d\n", pid, pri);
    350     return pri;
    351 }
    352 
    353 jboolean android_os_Process_setOomAdj(JNIEnv* env, jobject clazz,
    354                                       jint pid, jint adj)
    355 {
    356 #ifdef HAVE_OOM_ADJ
    357     char text[64];
    358     sprintf(text, "/proc/%d/oom_adj", pid);
    359     int fd = open(text, O_WRONLY);
    360     if (fd >= 0) {
    361         sprintf(text, "%d", adj);
    362         write(fd, text, strlen(text));
    363         close(fd);
    364     }
    365     return true;
    366 #endif
    367     return false;
    368 }
    369 
    370 void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name)
    371 {
    372     if (name == NULL) {
    373         jniThrowNullPointerException(env, NULL);
    374         return;
    375     }
    376 
    377     const jchar* str = env->GetStringCritical(name, 0);
    378     String8 name8;
    379     if (str) {
    380         name8 = String8(str, env->GetStringLength(name));
    381         env->ReleaseStringCritical(name, str);
    382     }
    383 
    384     if (name8.size() > 0) {
    385         ProcessState::self()->setArgV0(name8.string());
    386     }
    387 }
    388 
    389 jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid)
    390 {
    391     return setuid(uid) == 0 ? 0 : errno;
    392 }
    393 
    394 jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid)
    395 {
    396     return setgid(uid) == 0 ? 0 : errno;
    397 }
    398 
    399 static int pid_compare(const void* v1, const void* v2)
    400 {
    401     //ALOGI("Compare %d vs %d\n", *((const jint*)v1), *((const jint*)v2));
    402     return *((const jint*)v1) - *((const jint*)v2);
    403 }
    404 
    405 static jlong getFreeMemoryImpl(const char* const sums[], const int sumsLen[], int num)
    406 {
    407     int fd = open("/proc/meminfo", O_RDONLY);
    408 
    409     if (fd < 0) {
    410         ALOGW("Unable to open /proc/meminfo");
    411         return -1;
    412     }
    413 
    414     char buffer[256];
    415     const int len = read(fd, buffer, sizeof(buffer)-1);
    416     close(fd);
    417 
    418     if (len < 0) {
    419         ALOGW("Unable to read /proc/meminfo");
    420         return -1;
    421     }
    422     buffer[len] = 0;
    423 
    424     int numFound = 0;
    425     jlong mem = 0;
    426 
    427     char* p = buffer;
    428     while (*p && numFound < num) {
    429         int i = 0;
    430         while (sums[i]) {
    431             if (strncmp(p, sums[i], sumsLen[i]) == 0) {
    432                 p += sumsLen[i];
    433                 while (*p == ' ') p++;
    434                 char* num = p;
    435                 while (*p >= '0' && *p <= '9') p++;
    436                 if (*p != 0) {
    437                     *p = 0;
    438                     p++;
    439                     if (*p == 0) p--;
    440                 }
    441                 mem += atoll(num) * 1024;
    442                 numFound++;
    443                 break;
    444             }
    445             i++;
    446         }
    447         p++;
    448     }
    449 
    450     return numFound > 0 ? mem : -1;
    451 }
    452 
    453 static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz)
    454 {
    455     static const char* const sums[] = { "MemFree:", "Cached:", NULL };
    456     static const int sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), 0 };
    457     return getFreeMemoryImpl(sums, sumsLen, 2);
    458 }
    459 
    460 static jlong android_os_Process_getTotalMemory(JNIEnv* env, jobject clazz)
    461 {
    462     static const char* const sums[] = { "MemTotal:", NULL };
    463     static const int sumsLen[] = { strlen("MemTotal:"), 0 };
    464     return getFreeMemoryImpl(sums, sumsLen, 1);
    465 }
    466 
    467 void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr,
    468                                       jobjectArray reqFields, jlongArray outFields)
    469 {
    470     //ALOGI("getMemInfo: %p %p", reqFields, outFields);
    471 
    472     if (fileStr == NULL || reqFields == NULL || outFields == NULL) {
    473         jniThrowNullPointerException(env, NULL);
    474         return;
    475     }
    476 
    477     const char* file8 = env->GetStringUTFChars(fileStr, NULL);
    478     if (file8 == NULL) {
    479         return;
    480     }
    481     String8 file(file8);
    482     env->ReleaseStringUTFChars(fileStr, file8);
    483 
    484     jsize count = env->GetArrayLength(reqFields);
    485     if (count > env->GetArrayLength(outFields)) {
    486         jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ");
    487         return;
    488     }
    489 
    490     Vector<String8> fields;
    491     int i;
    492 
    493     for (i=0; i<count; i++) {
    494         jobject obj = env->GetObjectArrayElement(reqFields, i);
    495         if (obj != NULL) {
    496             const char* str8 = env->GetStringUTFChars((jstring)obj, NULL);
    497             //ALOGI("String at %d: %p = %s", i, obj, str8);
    498             if (str8 == NULL) {
    499                 jniThrowNullPointerException(env, "Element in reqFields");
    500                 return;
    501             }
    502             fields.add(String8(str8));
    503             env->ReleaseStringUTFChars((jstring)obj, str8);
    504         } else {
    505             jniThrowNullPointerException(env, "Element in reqFields");
    506             return;
    507         }
    508     }
    509 
    510     jlong* sizesArray = env->GetLongArrayElements(outFields, 0);
    511     if (sizesArray == NULL) {
    512         return;
    513     }
    514 
    515     //ALOGI("Clearing %d sizes", count);
    516     for (i=0; i<count; i++) {
    517         sizesArray[i] = 0;
    518     }
    519 
    520     int fd = open(file.string(), O_RDONLY);
    521 
    522     if (fd >= 0) {
    523         const size_t BUFFER_SIZE = 2048;
    524         char* buffer = (char*)malloc(BUFFER_SIZE);
    525         int len = read(fd, buffer, BUFFER_SIZE-1);
    526         close(fd);
    527 
    528         if (len < 0) {
    529             ALOGW("Unable to read %s", file.string());
    530             len = 0;
    531         }
    532         buffer[len] = 0;
    533 
    534         int foundCount = 0;
    535 
    536         char* p = buffer;
    537         while (*p && foundCount < count) {
    538             bool skipToEol = true;
    539             //ALOGI("Parsing at: %s", p);
    540             for (i=0; i<count; i++) {
    541                 const String8& field = fields[i];
    542                 if (strncmp(p, field.string(), field.length()) == 0) {
    543                     p += field.length();
    544                     while (*p == ' ' || *p == '\t') p++;
    545                     char* num = p;
    546                     while (*p >= '0' && *p <= '9') p++;
    547                     skipToEol = *p != '\n';
    548                     if (*p != 0) {
    549                         *p = 0;
    550                         p++;
    551                     }
    552                     char* end;
    553                     sizesArray[i] = strtoll(num, &end, 10);
    554                     //ALOGI("Field %s = %d", field.string(), sizesArray[i]);
    555                     foundCount++;
    556                     break;
    557                 }
    558             }
    559             if (skipToEol) {
    560                 while (*p && *p != '\n') {
    561                     p++;
    562                 }
    563                 if (*p == '\n') {
    564                     p++;
    565                 }
    566             }
    567         }
    568 
    569         free(buffer);
    570     } else {
    571         ALOGW("Unable to open %s", file.string());
    572     }
    573 
    574     //ALOGI("Done!");
    575     env->ReleaseLongArrayElements(outFields, sizesArray, 0);
    576 }
    577 
    578 jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz,
    579                                      jstring file, jintArray lastArray)
    580 {
    581     if (file == NULL) {
    582         jniThrowNullPointerException(env, NULL);
    583         return NULL;
    584     }
    585 
    586     const char* file8 = env->GetStringUTFChars(file, NULL);
    587     if (file8 == NULL) {
    588         jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
    589         return NULL;
    590     }
    591 
    592     DIR* dirp = opendir(file8);
    593 
    594     env->ReleaseStringUTFChars(file, file8);
    595 
    596     if(dirp == NULL) {
    597         return NULL;
    598     }
    599 
    600     jsize curCount = 0;
    601     jint* curData = NULL;
    602     if (lastArray != NULL) {
    603         curCount = env->GetArrayLength(lastArray);
    604         curData = env->GetIntArrayElements(lastArray, 0);
    605     }
    606 
    607     jint curPos = 0;
    608 
    609     struct dirent* entry;
    610     while ((entry=readdir(dirp)) != NULL) {
    611         const char* p = entry->d_name;
    612         while (*p) {
    613             if (*p < '0' || *p > '9') break;
    614             p++;
    615         }
    616         if (*p != 0) continue;
    617 
    618         char* end;
    619         int pid = strtol(entry->d_name, &end, 10);
    620         //ALOGI("File %s pid=%d\n", entry->d_name, pid);
    621         if (curPos >= curCount) {
    622             jsize newCount = (curCount == 0) ? 10 : (curCount*2);
    623             jintArray newArray = env->NewIntArray(newCount);
    624             if (newArray == NULL) {
    625                 closedir(dirp);
    626                 jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
    627                 return NULL;
    628             }
    629             jint* newData = env->GetIntArrayElements(newArray, 0);
    630             if (curData != NULL) {
    631                 memcpy(newData, curData, sizeof(jint)*curCount);
    632                 env->ReleaseIntArrayElements(lastArray, curData, 0);
    633             }
    634             lastArray = newArray;
    635             curCount = newCount;
    636             curData = newData;
    637         }
    638 
    639         curData[curPos] = pid;
    640         curPos++;
    641     }
    642 
    643     closedir(dirp);
    644 
    645     if (curData != NULL && curPos > 0) {
    646         qsort(curData, curPos, sizeof(jint), pid_compare);
    647     }
    648 
    649     while (curPos < curCount) {
    650         curData[curPos] = -1;
    651         curPos++;
    652     }
    653 
    654     if (curData != NULL) {
    655         env->ReleaseIntArrayElements(lastArray, curData, 0);
    656     }
    657 
    658     return lastArray;
    659 }
    660 
    661 enum {
    662     PROC_TERM_MASK = 0xff,
    663     PROC_ZERO_TERM = 0,
    664     PROC_SPACE_TERM = ' ',
    665     PROC_COMBINE = 0x100,
    666     PROC_PARENS = 0x200,
    667     PROC_OUT_STRING = 0x1000,
    668     PROC_OUT_LONG = 0x2000,
    669     PROC_OUT_FLOAT = 0x4000,
    670 };
    671 
    672 jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz,
    673         char* buffer, jint startIndex, jint endIndex, jintArray format,
    674         jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
    675 {
    676 
    677     const jsize NF = env->GetArrayLength(format);
    678     const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0;
    679     const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0;
    680     const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0;
    681 
    682     jint* formatData = env->GetIntArrayElements(format, 0);
    683     jlong* longsData = outLongs ?
    684         env->GetLongArrayElements(outLongs, 0) : NULL;
    685     jfloat* floatsData = outFloats ?
    686         env->GetFloatArrayElements(outFloats, 0) : NULL;
    687     if (formatData == NULL || (NL > 0 && longsData == NULL)
    688             || (NR > 0 && floatsData == NULL)) {
    689         if (formatData != NULL) {
    690             env->ReleaseIntArrayElements(format, formatData, 0);
    691         }
    692         if (longsData != NULL) {
    693             env->ReleaseLongArrayElements(outLongs, longsData, 0);
    694         }
    695         if (floatsData != NULL) {
    696             env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
    697         }
    698         jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
    699         return JNI_FALSE;
    700     }
    701 
    702     jsize i = startIndex;
    703     jsize di = 0;
    704 
    705     jboolean res = JNI_TRUE;
    706 
    707     for (jsize fi=0; fi<NF; fi++) {
    708         const jint mode = formatData[fi];
    709         if ((mode&PROC_PARENS) != 0) {
    710             i++;
    711         }
    712         const char term = (char)(mode&PROC_TERM_MASK);
    713         const jsize start = i;
    714         if (i >= endIndex) {
    715             res = JNI_FALSE;
    716             break;
    717         }
    718 
    719         jsize end = -1;
    720         if ((mode&PROC_PARENS) != 0) {
    721             while (buffer[i] != ')' && i < endIndex) {
    722                 i++;
    723             }
    724             end = i;
    725             i++;
    726         }
    727         while (buffer[i] != term && i < endIndex) {
    728             i++;
    729         }
    730         if (end < 0) {
    731             end = i;
    732         }
    733 
    734         if (i < endIndex) {
    735             i++;
    736             if ((mode&PROC_COMBINE) != 0) {
    737                 while (buffer[i] == term && i < endIndex) {
    738                     i++;
    739                 }
    740             }
    741         }
    742 
    743         //ALOGI("Field %d: %d-%d dest=%d mode=0x%x\n", i, start, end, di, mode);
    744 
    745         if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) {
    746             char c = buffer[end];
    747             buffer[end] = 0;
    748             if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) {
    749                 char* end;
    750                 floatsData[di] = strtof(buffer+start, &end);
    751             }
    752             if ((mode&PROC_OUT_LONG) != 0 && di < NL) {
    753                 char* end;
    754                 longsData[di] = strtoll(buffer+start, &end, 10);
    755             }
    756             if ((mode&PROC_OUT_STRING) != 0 && di < NS) {
    757                 jstring str = env->NewStringUTF(buffer+start);
    758                 env->SetObjectArrayElement(outStrings, di, str);
    759             }
    760             buffer[end] = c;
    761             di++;
    762         }
    763     }
    764 
    765     env->ReleaseIntArrayElements(format, formatData, 0);
    766     if (longsData != NULL) {
    767         env->ReleaseLongArrayElements(outLongs, longsData, 0);
    768     }
    769     if (floatsData != NULL) {
    770         env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
    771     }
    772 
    773     return res;
    774 }
    775 
    776 jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz,
    777         jbyteArray buffer, jint startIndex, jint endIndex, jintArray format,
    778         jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
    779 {
    780         jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL);
    781 
    782         jboolean result = android_os_Process_parseProcLineArray(env, clazz,
    783                 (char*) bufferArray, startIndex, endIndex, format, outStrings,
    784                 outLongs, outFloats);
    785 
    786         env->ReleaseByteArrayElements(buffer, bufferArray, 0);
    787 
    788         return result;
    789 }
    790 
    791 jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz,
    792         jstring file, jintArray format, jobjectArray outStrings,
    793         jlongArray outLongs, jfloatArray outFloats)
    794 {
    795     if (file == NULL || format == NULL) {
    796         jniThrowNullPointerException(env, NULL);
    797         return JNI_FALSE;
    798     }
    799 
    800     const char* file8 = env->GetStringUTFChars(file, NULL);
    801     if (file8 == NULL) {
    802         jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
    803         return JNI_FALSE;
    804     }
    805     int fd = open(file8, O_RDONLY);
    806     env->ReleaseStringUTFChars(file, file8);
    807 
    808     if (fd < 0) {
    809         //ALOGW("Unable to open process file: %s\n", file8);
    810         return JNI_FALSE;
    811     }
    812 
    813     char buffer[256];
    814     const int len = read(fd, buffer, sizeof(buffer)-1);
    815     close(fd);
    816 
    817     if (len < 0) {
    818         //ALOGW("Unable to open process file: %s fd=%d\n", file8, fd);
    819         return JNI_FALSE;
    820     }
    821     buffer[len] = 0;
    822 
    823     return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len,
    824             format, outStrings, outLongs, outFloats);
    825 
    826 }
    827 
    828 void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz,
    829                                              jobject binderObject)
    830 {
    831     if (binderObject == NULL) {
    832         jniThrowNullPointerException(env, NULL);
    833         return;
    834     }
    835 
    836     sp<IBinder> binder = ibinderForJavaObject(env, binderObject);
    837 }
    838 
    839 void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig)
    840 {
    841     if (pid > 0) {
    842         ALOGI("Sending signal. PID: %d SIG: %d", pid, sig);
    843         kill(pid, sig);
    844     }
    845 }
    846 
    847 void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig)
    848 {
    849     if (pid > 0) {
    850         kill(pid, sig);
    851     }
    852 }
    853 
    854 static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz)
    855 {
    856     struct timespec ts;
    857 
    858     int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
    859 
    860     if (res != 0) {
    861         return (jlong) 0;
    862     }
    863 
    864     nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
    865     return (jlong) nanoseconds_to_milliseconds(when);
    866 }
    867 
    868 static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid)
    869 {
    870     char filename[64];
    871 
    872     snprintf(filename, sizeof(filename), "/proc/%d/smaps", pid);
    873 
    874     FILE * file = fopen(filename, "r");
    875     if (!file) {
    876         return (jlong) -1;
    877     }
    878 
    879     // Tally up all of the Pss from the various maps
    880     char line[256];
    881     jlong pss = 0;
    882     while (fgets(line, sizeof(line), file)) {
    883         jlong v;
    884         if (sscanf(line, "Pss: %lld kB", &v) == 1) {
    885             pss += v;
    886         }
    887     }
    888 
    889     fclose(file);
    890 
    891     // Return the Pss value in bytes, not kilobytes
    892     return pss * 1024;
    893 }
    894 
    895 jintArray android_os_Process_getPidsForCommands(JNIEnv* env, jobject clazz,
    896         jobjectArray commandNames)
    897 {
    898     if (commandNames == NULL) {
    899         jniThrowNullPointerException(env, NULL);
    900         return NULL;
    901     }
    902 
    903     Vector<String8> commands;
    904 
    905     jsize count = env->GetArrayLength(commandNames);
    906 
    907     for (int i=0; i<count; i++) {
    908         jobject obj = env->GetObjectArrayElement(commandNames, i);
    909         if (obj != NULL) {
    910             const char* str8 = env->GetStringUTFChars((jstring)obj, NULL);
    911             if (str8 == NULL) {
    912                 jniThrowNullPointerException(env, "Element in commandNames");
    913                 return NULL;
    914             }
    915             commands.add(String8(str8));
    916             env->ReleaseStringUTFChars((jstring)obj, str8);
    917         } else {
    918             jniThrowNullPointerException(env, "Element in commandNames");
    919             return NULL;
    920         }
    921     }
    922 
    923     Vector<jint> pids;
    924 
    925     DIR *proc = opendir("/proc");
    926     if (proc == NULL) {
    927         fprintf(stderr, "/proc: %s\n", strerror(errno));
    928         return NULL;
    929     }
    930 
    931     struct dirent *d;
    932     while ((d = readdir(proc))) {
    933         int pid = atoi(d->d_name);
    934         if (pid <= 0) continue;
    935 
    936         char path[PATH_MAX];
    937         char data[PATH_MAX];
    938         snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
    939 
    940         int fd = open(path, O_RDONLY);
    941         if (fd < 0) {
    942             continue;
    943         }
    944         const int len = read(fd, data, sizeof(data)-1);
    945         close(fd);
    946 
    947         if (len < 0) {
    948             continue;
    949         }
    950         data[len] = 0;
    951 
    952         for (int i=0; i<len; i++) {
    953             if (data[i] == ' ') {
    954                 data[i] = 0;
    955                 break;
    956             }
    957         }
    958 
    959         for (size_t i=0; i<commands.size(); i++) {
    960             if (commands[i] == data) {
    961                 pids.add(pid);
    962                 break;
    963             }
    964         }
    965     }
    966 
    967     closedir(proc);
    968 
    969     jintArray pidArray = env->NewIntArray(pids.size());
    970     if (pidArray == NULL) {
    971         jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
    972         return NULL;
    973     }
    974 
    975     if (pids.size() > 0) {
    976         env->SetIntArrayRegion(pidArray, 0, pids.size(), pids.array());
    977     }
    978 
    979     return pidArray;
    980 }
    981 
    982 static const JNINativeMethod methods[] = {
    983     {"myPid",       "()I", (void*)android_os_Process_myPid},
    984     {"myTid",       "()I", (void*)android_os_Process_myTid},
    985     {"myUid",       "()I", (void*)android_os_Process_myUid},
    986     {"getUidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName},
    987     {"getGidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName},
    988     {"setThreadPriority",   "(II)V", (void*)android_os_Process_setThreadPriority},
    989     {"setThreadScheduler",  "(III)V", (void*)android_os_Process_setThreadScheduler},
    990     {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground},
    991     {"setThreadPriority",   "(I)V", (void*)android_os_Process_setCallingThreadPriority},
    992     {"getThreadPriority",   "(I)I", (void*)android_os_Process_getThreadPriority},
    993     {"setThreadGroup",      "(II)V", (void*)android_os_Process_setThreadGroup},
    994     {"setProcessGroup",      "(II)V", (void*)android_os_Process_setProcessGroup},
    995     {"setOomAdj",   "(II)Z", (void*)android_os_Process_setOomAdj},
    996     {"setArgV0",    "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0},
    997     {"setUid", "(I)I", (void*)android_os_Process_setUid},
    998     {"setGid", "(I)I", (void*)android_os_Process_setGid},
    999     {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal},
   1000     {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet},
   1001     {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory},
   1002     {"getTotalMemory", "()J", (void*)android_os_Process_getTotalMemory},
   1003     {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines},
   1004     {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids},
   1005     {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile},
   1006     {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine},
   1007     {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime},
   1008     {"getPss", "(I)J", (void*)android_os_Process_getPss},
   1009     {"getPidsForCommands", "([Ljava/lang/String;)[I", (void*)android_os_Process_getPidsForCommands},
   1010     //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject},
   1011 };
   1012 
   1013 const char* const kProcessPathName = "android/os/Process";
   1014 
   1015 int register_android_os_Process(JNIEnv* env)
   1016 {
   1017     return AndroidRuntime::registerNativeMethods(
   1018         env, kProcessPathName,
   1019         methods, NELEM(methods));
   1020 }
   1021