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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 <sys/stat.h>
     37 #include <dirent.h>
     38 #include <fcntl.h>
     39 #include <grp.h>
     40 #include <pwd.h>
     41 #include <signal.h>
     42 #include <unistd.h>
     43 
     44 #define POLICY_DEBUG 0
     45 #define GUARD_THREAD_PRIORITY 0
     46 
     47 using namespace android;
     48 
     49 #if GUARD_THREAD_PRIORITY
     50 Mutex gKeyCreateMutex;
     51 static pthread_key_t gBgKey = -1;
     52 #endif
     53 
     54 // For both of these, err should be in the errno range (positive), not a status_t (negative)
     55 
     56 static void signalExceptionForPriorityError(JNIEnv* env, int err)
     57 {
     58     switch (err) {
     59         case EINVAL:
     60             jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
     61             break;
     62         case ESRCH:
     63             jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist");
     64             break;
     65         case EPERM:
     66             jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread");
     67             break;
     68         case EACCES:
     69             jniThrowException(env, "java/lang/SecurityException", "No permission to set to given priority");
     70             break;
     71         default:
     72             jniThrowException(env, "java/lang/RuntimeException", "Unknown error");
     73             break;
     74     }
     75 }
     76 
     77 static void signalExceptionForGroupError(JNIEnv* env, int err)
     78 {
     79     switch (err) {
     80         case EINVAL:
     81             jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
     82             break;
     83         case ESRCH:
     84             jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist");
     85             break;
     86         case EPERM:
     87             jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread");
     88             break;
     89         case EACCES:
     90             jniThrowException(env, "java/lang/SecurityException", "No permission to set to given group");
     91             break;
     92         default:
     93             jniThrowException(env, "java/lang/RuntimeException", "Unknown error");
     94             break;
     95     }
     96 }
     97 
     98 jint android_os_Process_getUidForName(JNIEnv* env, jobject clazz, jstring name)
     99 {
    100     if (name == NULL) {
    101         jniThrowNullPointerException(env, NULL);
    102         return -1;
    103     }
    104 
    105     const jchar* str16 = env->GetStringCritical(name, 0);
    106     String8 name8;
    107     if (str16) {
    108         name8 = String8(str16, env->GetStringLength(name));
    109         env->ReleaseStringCritical(name, str16);
    110     }
    111 
    112     const size_t N = name8.size();
    113     if (N > 0) {
    114         const char* str = name8.string();
    115         for (size_t i=0; i<N; i++) {
    116             if (str[i] < '0' || str[i] > '9') {
    117                 struct passwd* pwd = getpwnam(str);
    118                 if (pwd == NULL) {
    119                     return -1;
    120                 }
    121                 return pwd->pw_uid;
    122             }
    123         }
    124         return atoi(str);
    125     }
    126     return -1;
    127 }
    128 
    129 jint android_os_Process_getGidForName(JNIEnv* env, jobject clazz, jstring name)
    130 {
    131     if (name == NULL) {
    132         jniThrowNullPointerException(env, NULL);
    133         return -1;
    134     }
    135 
    136     const jchar* str16 = env->GetStringCritical(name, 0);
    137     String8 name8;
    138     if (str16) {
    139         name8 = String8(str16, env->GetStringLength(name));
    140         env->ReleaseStringCritical(name, str16);
    141     }
    142 
    143     const size_t N = name8.size();
    144     if (N > 0) {
    145         const char* str = name8.string();
    146         for (size_t i=0; i<N; i++) {
    147             if (str[i] < '0' || str[i] > '9') {
    148                 struct group* grp = getgrnam(str);
    149                 if (grp == NULL) {
    150                     return -1;
    151                 }
    152                 return grp->gr_gid;
    153             }
    154         }
    155         return atoi(str);
    156     }
    157     return -1;
    158 }
    159 
    160 void android_os_Process_setThreadGroup(JNIEnv* env, jobject clazz, int tid, jint grp)
    161 {
    162     ALOGV("%s tid=%d grp=%d", __func__, tid, grp);
    163     SchedPolicy sp = (SchedPolicy) grp;
    164     int res = set_sched_policy(tid, sp);
    165     if (res != NO_ERROR) {
    166         signalExceptionForGroupError(env, -res);
    167     }
    168 }
    169 
    170 void android_os_Process_setProcessGroup(JNIEnv* env, jobject clazz, int pid, jint grp)
    171 {
    172     ALOGV("%s pid=%d grp=%d", __func__, pid, grp);
    173     DIR *d;
    174     FILE *fp;
    175     char proc_path[255];
    176     struct dirent *de;
    177 
    178     if ((grp == SP_FOREGROUND) || (grp > SP_MAX)) {
    179         signalExceptionForGroupError(env, EINVAL);
    180         return;
    181     }
    182 
    183     bool isDefault = false;
    184     if (grp < 0) {
    185         grp = SP_FOREGROUND;
    186         isDefault = true;
    187     }
    188     SchedPolicy sp = (SchedPolicy) grp;
    189 
    190 #if POLICY_DEBUG
    191     char cmdline[32];
    192     int fd;
    193 
    194     strcpy(cmdline, "unknown");
    195 
    196     sprintf(proc_path, "/proc/%d/cmdline", pid);
    197     fd = open(proc_path, O_RDONLY);
    198     if (fd >= 0) {
    199         int rc = read(fd, cmdline, sizeof(cmdline)-1);
    200         cmdline[rc] = 0;
    201         close(fd);
    202     }
    203 
    204     if (sp == SP_BACKGROUND) {
    205         ALOGD("setProcessGroup: vvv pid %d (%s)", pid, cmdline);
    206     } else {
    207         ALOGD("setProcessGroup: ^^^ pid %d (%s)", pid, cmdline);
    208     }
    209 #endif
    210     sprintf(proc_path, "/proc/%d/task", pid);
    211     if (!(d = opendir(proc_path))) {
    212         // If the process exited on us, don't generate an exception
    213         if (errno != ENOENT)
    214             signalExceptionForGroupError(env, errno);
    215         return;
    216     }
    217 
    218     while ((de = readdir(d))) {
    219         int t_pid;
    220         int t_pri;
    221 
    222         if (de->d_name[0] == '.')
    223             continue;
    224         t_pid = atoi(de->d_name);
    225 
    226         if (!t_pid) {
    227             ALOGE("Error getting pid for '%s'\n", de->d_name);
    228             continue;
    229         }
    230 
    231         t_pri = getpriority(PRIO_PROCESS, t_pid);
    232 
    233         if (t_pri <= ANDROID_PRIORITY_AUDIO) {
    234             int scheduler = sched_getscheduler(t_pid);
    235             if ((scheduler == SCHED_FIFO) || (scheduler == SCHED_RR)) {
    236                 // This task wants to stay in it's current audio group so it can keep it's budget
    237                 continue;
    238             }
    239         }
    240 
    241         if (isDefault) {
    242             if (t_pri >= ANDROID_PRIORITY_BACKGROUND) {
    243                 // This task wants to stay at background
    244                 continue;
    245             }
    246         }
    247 
    248         int err = set_sched_policy(t_pid, sp);
    249         if (err != NO_ERROR) {
    250             signalExceptionForGroupError(env, -err);
    251             break;
    252         }
    253     }
    254     closedir(d);
    255 }
    256 
    257 jint android_os_Process_getProcessGroup(JNIEnv* env, jobject clazz, jint pid)
    258 {
    259     SchedPolicy sp;
    260     if (get_sched_policy(pid, &sp) != 0) {
    261         signalExceptionForGroupError(env, errno);
    262     }
    263     return (int) sp;
    264 }
    265 
    266 static void android_os_Process_setCanSelfBackground(JNIEnv* env, jobject clazz, jboolean bgOk) {
    267     // Establishes the calling thread as illegal to put into the background.
    268     // Typically used only for the system process's main looper.
    269 #if GUARD_THREAD_PRIORITY
    270     ALOGV("Process.setCanSelfBackground(%d) : tid=%d", bgOk, androidGetTid());
    271     {
    272         Mutex::Autolock _l(gKeyCreateMutex);
    273         if (gBgKey == -1) {
    274             pthread_key_create(&gBgKey, NULL);
    275         }
    276     }
    277 
    278     // inverted:  not-okay, we set a sentinel value
    279     pthread_setspecific(gBgKey, (void*)(bgOk ? 0 : 0xbaad));
    280 #endif
    281 }
    282 
    283 void android_os_Process_setThreadScheduler(JNIEnv* env, jclass clazz,
    284                                               jint tid, jint policy, jint pri)
    285 {
    286 #ifdef HAVE_SCHED_SETSCHEDULER
    287     struct sched_param param;
    288     param.sched_priority = pri;
    289     int rc = sched_setscheduler(tid, policy, &param);
    290     if (rc) {
    291         signalExceptionForPriorityError(env, errno);
    292     }
    293 #else
    294     signalExceptionForPriorityError(env, ENOSYS);
    295 #endif
    296 }
    297 
    298 void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz,
    299                                               jint pid, jint pri)
    300 {
    301 #if GUARD_THREAD_PRIORITY
    302     // if we're putting the current thread into the background, check the TLS
    303     // to make sure this thread isn't guarded.  If it is, raise an exception.
    304     if (pri >= ANDROID_PRIORITY_BACKGROUND) {
    305         if (pid == androidGetTid()) {
    306             void* bgOk = pthread_getspecific(gBgKey);
    307             if (bgOk == ((void*)0xbaad)) {
    308                 ALOGE("Thread marked fg-only put self in background!");
    309                 jniThrowException(env, "java/lang/SecurityException", "May not put this thread into background");
    310                 return;
    311             }
    312         }
    313     }
    314 #endif
    315 
    316     int rc = androidSetThreadPriority(pid, pri);
    317     if (rc != 0) {
    318         if (rc == INVALID_OPERATION) {
    319             signalExceptionForPriorityError(env, errno);
    320         } else {
    321             signalExceptionForGroupError(env, errno);
    322         }
    323     }
    324 
    325     //ALOGI("Setting priority of %d: %d, getpriority returns %d\n",
    326     //     pid, pri, getpriority(PRIO_PROCESS, pid));
    327 }
    328 
    329 void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz,
    330                                                         jint pri)
    331 {
    332     android_os_Process_setThreadPriority(env, clazz, androidGetTid(), pri);
    333 }
    334 
    335 jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz,
    336                                               jint pid)
    337 {
    338     errno = 0;
    339     jint pri = getpriority(PRIO_PROCESS, pid);
    340     if (errno != 0) {
    341         signalExceptionForPriorityError(env, errno);
    342     }
    343     //ALOGI("Returning priority of %d: %d\n", pid, pri);
    344     return pri;
    345 }
    346 
    347 jboolean android_os_Process_setOomAdj(JNIEnv* env, jobject clazz,
    348                                       jint pid, jint adj)
    349 {
    350 #ifdef HAVE_OOM_ADJ
    351     char text[64];
    352     sprintf(text, "/proc/%d/oom_adj", pid);
    353     int fd = open(text, O_WRONLY);
    354     if (fd >= 0) {
    355         sprintf(text, "%d", adj);
    356         write(fd, text, strlen(text));
    357         close(fd);
    358     }
    359     return true;
    360 #endif
    361     return false;
    362 }
    363 
    364 jboolean android_os_Process_setSwappiness(JNIEnv *env, jobject clazz,
    365                                           jint pid, jboolean is_increased)
    366 {
    367     char text[64];
    368 
    369     if (is_increased) {
    370         strcpy(text, "/sys/fs/cgroup/memory/sw/tasks");
    371     } else {
    372         strcpy(text, "/sys/fs/cgroup/memory/tasks");
    373     }
    374 
    375     struct stat st;
    376     if (stat(text, &st) || !S_ISREG(st.st_mode)) {
    377         return false;
    378     }
    379 
    380     int fd = open(text, O_WRONLY);
    381     if (fd >= 0) {
    382         sprintf(text, "%d", pid);
    383         write(fd, text, strlen(text));
    384         close(fd);
    385     }
    386 
    387     return true;
    388 }
    389 
    390 void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name)
    391 {
    392     if (name == NULL) {
    393         jniThrowNullPointerException(env, NULL);
    394         return;
    395     }
    396 
    397     const jchar* str = env->GetStringCritical(name, 0);
    398     String8 name8;
    399     if (str) {
    400         name8 = String8(str, env->GetStringLength(name));
    401         env->ReleaseStringCritical(name, str);
    402     }
    403 
    404     if (name8.size() > 0) {
    405         ProcessState::self()->setArgV0(name8.string());
    406     }
    407 }
    408 
    409 jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid)
    410 {
    411     return setuid(uid) == 0 ? 0 : errno;
    412 }
    413 
    414 jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid)
    415 {
    416     return setgid(uid) == 0 ? 0 : errno;
    417 }
    418 
    419 static int pid_compare(const void* v1, const void* v2)
    420 {
    421     //ALOGI("Compare %d vs %d\n", *((const jint*)v1), *((const jint*)v2));
    422     return *((const jint*)v1) - *((const jint*)v2);
    423 }
    424 
    425 static jlong getFreeMemoryImpl(const char* const sums[], const int sumsLen[], int num)
    426 {
    427     int fd = open("/proc/meminfo", O_RDONLY);
    428 
    429     if (fd < 0) {
    430         ALOGW("Unable to open /proc/meminfo");
    431         return -1;
    432     }
    433 
    434     char buffer[256];
    435     const int len = read(fd, buffer, sizeof(buffer)-1);
    436     close(fd);
    437 
    438     if (len < 0) {
    439         ALOGW("Unable to read /proc/meminfo");
    440         return -1;
    441     }
    442     buffer[len] = 0;
    443 
    444     int numFound = 0;
    445     jlong mem = 0;
    446 
    447     char* p = buffer;
    448     while (*p && numFound < num) {
    449         int i = 0;
    450         while (sums[i]) {
    451             if (strncmp(p, sums[i], sumsLen[i]) == 0) {
    452                 p += sumsLen[i];
    453                 while (*p == ' ') p++;
    454                 char* num = p;
    455                 while (*p >= '0' && *p <= '9') p++;
    456                 if (*p != 0) {
    457                     *p = 0;
    458                     p++;
    459                     if (*p == 0) p--;
    460                 }
    461                 mem += atoll(num) * 1024;
    462                 numFound++;
    463                 break;
    464             }
    465             i++;
    466         }
    467         p++;
    468     }
    469 
    470     return numFound > 0 ? mem : -1;
    471 }
    472 
    473 static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz)
    474 {
    475     static const char* const sums[] = { "MemFree:", "Cached:", NULL };
    476     static const int sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), 0 };
    477     return getFreeMemoryImpl(sums, sumsLen, 2);
    478 }
    479 
    480 static jlong android_os_Process_getTotalMemory(JNIEnv* env, jobject clazz)
    481 {
    482     static const char* const sums[] = { "MemTotal:", NULL };
    483     static const int sumsLen[] = { strlen("MemTotal:"), 0 };
    484     return getFreeMemoryImpl(sums, sumsLen, 1);
    485 }
    486 
    487 void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr,
    488                                       jobjectArray reqFields, jlongArray outFields)
    489 {
    490     //ALOGI("getMemInfo: %p %p", reqFields, outFields);
    491 
    492     if (fileStr == NULL || reqFields == NULL || outFields == NULL) {
    493         jniThrowNullPointerException(env, NULL);
    494         return;
    495     }
    496 
    497     const char* file8 = env->GetStringUTFChars(fileStr, NULL);
    498     if (file8 == NULL) {
    499         return;
    500     }
    501     String8 file(file8);
    502     env->ReleaseStringUTFChars(fileStr, file8);
    503 
    504     jsize count = env->GetArrayLength(reqFields);
    505     if (count > env->GetArrayLength(outFields)) {
    506         jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ");
    507         return;
    508     }
    509 
    510     Vector<String8> fields;
    511     int i;
    512 
    513     for (i=0; i<count; i++) {
    514         jobject obj = env->GetObjectArrayElement(reqFields, i);
    515         if (obj != NULL) {
    516             const char* str8 = env->GetStringUTFChars((jstring)obj, NULL);
    517             //ALOGI("String at %d: %p = %s", i, obj, str8);
    518             if (str8 == NULL) {
    519                 jniThrowNullPointerException(env, "Element in reqFields");
    520                 return;
    521             }
    522             fields.add(String8(str8));
    523             env->ReleaseStringUTFChars((jstring)obj, str8);
    524         } else {
    525             jniThrowNullPointerException(env, "Element in reqFields");
    526             return;
    527         }
    528     }
    529 
    530     jlong* sizesArray = env->GetLongArrayElements(outFields, 0);
    531     if (sizesArray == NULL) {
    532         return;
    533     }
    534 
    535     //ALOGI("Clearing %d sizes", count);
    536     for (i=0; i<count; i++) {
    537         sizesArray[i] = 0;
    538     }
    539 
    540     int fd = open(file.string(), O_RDONLY);
    541 
    542     if (fd >= 0) {
    543         const size_t BUFFER_SIZE = 2048;
    544         char* buffer = (char*)malloc(BUFFER_SIZE);
    545         int len = read(fd, buffer, BUFFER_SIZE-1);
    546         close(fd);
    547 
    548         if (len < 0) {
    549             ALOGW("Unable to read %s", file.string());
    550             len = 0;
    551         }
    552         buffer[len] = 0;
    553 
    554         int foundCount = 0;
    555 
    556         char* p = buffer;
    557         while (*p && foundCount < count) {
    558             bool skipToEol = true;
    559             //ALOGI("Parsing at: %s", p);
    560             for (i=0; i<count; i++) {
    561                 const String8& field = fields[i];
    562                 if (strncmp(p, field.string(), field.length()) == 0) {
    563                     p += field.length();
    564                     while (*p == ' ' || *p == '\t') p++;
    565                     char* num = p;
    566                     while (*p >= '0' && *p <= '9') p++;
    567                     skipToEol = *p != '\n';
    568                     if (*p != 0) {
    569                         *p = 0;
    570                         p++;
    571                     }
    572                     char* end;
    573                     sizesArray[i] = strtoll(num, &end, 10);
    574                     //ALOGI("Field %s = %d", field.string(), sizesArray[i]);
    575                     foundCount++;
    576                     break;
    577                 }
    578             }
    579             if (skipToEol) {
    580                 while (*p && *p != '\n') {
    581                     p++;
    582                 }
    583                 if (*p == '\n') {
    584                     p++;
    585                 }
    586             }
    587         }
    588 
    589         free(buffer);
    590     } else {
    591         ALOGW("Unable to open %s", file.string());
    592     }
    593 
    594     //ALOGI("Done!");
    595     env->ReleaseLongArrayElements(outFields, sizesArray, 0);
    596 }
    597 
    598 jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz,
    599                                      jstring file, jintArray lastArray)
    600 {
    601     if (file == NULL) {
    602         jniThrowNullPointerException(env, NULL);
    603         return NULL;
    604     }
    605 
    606     const char* file8 = env->GetStringUTFChars(file, NULL);
    607     if (file8 == NULL) {
    608         jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
    609         return NULL;
    610     }
    611 
    612     DIR* dirp = opendir(file8);
    613 
    614     env->ReleaseStringUTFChars(file, file8);
    615 
    616     if(dirp == NULL) {
    617         return NULL;
    618     }
    619 
    620     jsize curCount = 0;
    621     jint* curData = NULL;
    622     if (lastArray != NULL) {
    623         curCount = env->GetArrayLength(lastArray);
    624         curData = env->GetIntArrayElements(lastArray, 0);
    625     }
    626 
    627     jint curPos = 0;
    628 
    629     struct dirent* entry;
    630     while ((entry=readdir(dirp)) != NULL) {
    631         const char* p = entry->d_name;
    632         while (*p) {
    633             if (*p < '0' || *p > '9') break;
    634             p++;
    635         }
    636         if (*p != 0) continue;
    637 
    638         char* end;
    639         int pid = strtol(entry->d_name, &end, 10);
    640         //ALOGI("File %s pid=%d\n", entry->d_name, pid);
    641         if (curPos >= curCount) {
    642             jsize newCount = (curCount == 0) ? 10 : (curCount*2);
    643             jintArray newArray = env->NewIntArray(newCount);
    644             if (newArray == NULL) {
    645                 closedir(dirp);
    646                 jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
    647                 return NULL;
    648             }
    649             jint* newData = env->GetIntArrayElements(newArray, 0);
    650             if (curData != NULL) {
    651                 memcpy(newData, curData, sizeof(jint)*curCount);
    652                 env->ReleaseIntArrayElements(lastArray, curData, 0);
    653             }
    654             lastArray = newArray;
    655             curCount = newCount;
    656             curData = newData;
    657         }
    658 
    659         curData[curPos] = pid;
    660         curPos++;
    661     }
    662 
    663     closedir(dirp);
    664 
    665     if (curData != NULL && curPos > 0) {
    666         qsort(curData, curPos, sizeof(jint), pid_compare);
    667     }
    668 
    669     while (curPos < curCount) {
    670         curData[curPos] = -1;
    671         curPos++;
    672     }
    673 
    674     if (curData != NULL) {
    675         env->ReleaseIntArrayElements(lastArray, curData, 0);
    676     }
    677 
    678     return lastArray;
    679 }
    680 
    681 enum {
    682     PROC_TERM_MASK = 0xff,
    683     PROC_ZERO_TERM = 0,
    684     PROC_SPACE_TERM = ' ',
    685     PROC_COMBINE = 0x100,
    686     PROC_PARENS = 0x200,
    687     PROC_QUOTES = 0x400,
    688     PROC_OUT_STRING = 0x1000,
    689     PROC_OUT_LONG = 0x2000,
    690     PROC_OUT_FLOAT = 0x4000,
    691 };
    692 
    693 jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz,
    694         char* buffer, jint startIndex, jint endIndex, jintArray format,
    695         jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
    696 {
    697 
    698     const jsize NF = env->GetArrayLength(format);
    699     const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0;
    700     const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0;
    701     const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0;
    702 
    703     jint* formatData = env->GetIntArrayElements(format, 0);
    704     jlong* longsData = outLongs ?
    705         env->GetLongArrayElements(outLongs, 0) : NULL;
    706     jfloat* floatsData = outFloats ?
    707         env->GetFloatArrayElements(outFloats, 0) : NULL;
    708     if (formatData == NULL || (NL > 0 && longsData == NULL)
    709             || (NR > 0 && floatsData == NULL)) {
    710         if (formatData != NULL) {
    711             env->ReleaseIntArrayElements(format, formatData, 0);
    712         }
    713         if (longsData != NULL) {
    714             env->ReleaseLongArrayElements(outLongs, longsData, 0);
    715         }
    716         if (floatsData != NULL) {
    717             env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
    718         }
    719         jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
    720         return JNI_FALSE;
    721     }
    722 
    723     jsize i = startIndex;
    724     jsize di = 0;
    725 
    726     jboolean res = JNI_TRUE;
    727 
    728     for (jsize fi=0; fi<NF; fi++) {
    729         jint mode = formatData[fi];
    730         if ((mode&PROC_PARENS) != 0) {
    731             i++;
    732         } else if ((mode&PROC_QUOTES != 0)) {
    733             if (buffer[i] == '"') {
    734                 i++;
    735             } else {
    736                 mode &= ~PROC_QUOTES;
    737             }
    738         }
    739         const char term = (char)(mode&PROC_TERM_MASK);
    740         const jsize start = i;
    741         if (i >= endIndex) {
    742             res = JNI_FALSE;
    743             break;
    744         }
    745 
    746         jsize end = -1;
    747         if ((mode&PROC_PARENS) != 0) {
    748             while (buffer[i] != ')' && i < endIndex) {
    749                 i++;
    750             }
    751             end = i;
    752             i++;
    753         } else if ((mode&PROC_QUOTES) != 0) {
    754             while (buffer[i] != '"' && i < endIndex) {
    755                 i++;
    756             }
    757             end = i;
    758             i++;
    759         }
    760         while (buffer[i] != term && i < endIndex) {
    761             i++;
    762         }
    763         if (end < 0) {
    764             end = i;
    765         }
    766 
    767         if (i < endIndex) {
    768             i++;
    769             if ((mode&PROC_COMBINE) != 0) {
    770                 while (buffer[i] == term && i < endIndex) {
    771                     i++;
    772                 }
    773             }
    774         }
    775 
    776         //ALOGI("Field %d: %d-%d dest=%d mode=0x%x\n", i, start, end, di, mode);
    777 
    778         if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) {
    779             char c = buffer[end];
    780             buffer[end] = 0;
    781             if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) {
    782                 char* end;
    783                 floatsData[di] = strtof(buffer+start, &end);
    784             }
    785             if ((mode&PROC_OUT_LONG) != 0 && di < NL) {
    786                 char* end;
    787                 longsData[di] = strtoll(buffer+start, &end, 10);
    788             }
    789             if ((mode&PROC_OUT_STRING) != 0 && di < NS) {
    790                 jstring str = env->NewStringUTF(buffer+start);
    791                 env->SetObjectArrayElement(outStrings, di, str);
    792             }
    793             buffer[end] = c;
    794             di++;
    795         }
    796     }
    797 
    798     env->ReleaseIntArrayElements(format, formatData, 0);
    799     if (longsData != NULL) {
    800         env->ReleaseLongArrayElements(outLongs, longsData, 0);
    801     }
    802     if (floatsData != NULL) {
    803         env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
    804     }
    805 
    806     return res;
    807 }
    808 
    809 jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz,
    810         jbyteArray buffer, jint startIndex, jint endIndex, jintArray format,
    811         jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
    812 {
    813         jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL);
    814 
    815         jboolean result = android_os_Process_parseProcLineArray(env, clazz,
    816                 (char*) bufferArray, startIndex, endIndex, format, outStrings,
    817                 outLongs, outFloats);
    818 
    819         env->ReleaseByteArrayElements(buffer, bufferArray, 0);
    820 
    821         return result;
    822 }
    823 
    824 jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz,
    825         jstring file, jintArray format, jobjectArray outStrings,
    826         jlongArray outLongs, jfloatArray outFloats)
    827 {
    828     if (file == NULL || format == NULL) {
    829         jniThrowNullPointerException(env, NULL);
    830         return JNI_FALSE;
    831     }
    832 
    833     const char* file8 = env->GetStringUTFChars(file, NULL);
    834     if (file8 == NULL) {
    835         jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
    836         return JNI_FALSE;
    837     }
    838     int fd = open(file8, O_RDONLY);
    839     env->ReleaseStringUTFChars(file, file8);
    840 
    841     if (fd < 0) {
    842         //ALOGW("Unable to open process file: %s\n", file8);
    843         return JNI_FALSE;
    844     }
    845 
    846     char buffer[256];
    847     const int len = read(fd, buffer, sizeof(buffer)-1);
    848     close(fd);
    849 
    850     if (len < 0) {
    851         //ALOGW("Unable to open process file: %s fd=%d\n", file8, fd);
    852         return JNI_FALSE;
    853     }
    854     buffer[len] = 0;
    855 
    856     return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len,
    857             format, outStrings, outLongs, outFloats);
    858 
    859 }
    860 
    861 void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz,
    862                                              jobject binderObject)
    863 {
    864     if (binderObject == NULL) {
    865         jniThrowNullPointerException(env, NULL);
    866         return;
    867     }
    868 
    869     sp<IBinder> binder = ibinderForJavaObject(env, binderObject);
    870 }
    871 
    872 void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig)
    873 {
    874     if (pid > 0) {
    875         ALOGI("Sending signal. PID: %d SIG: %d", pid, sig);
    876         kill(pid, sig);
    877     }
    878 }
    879 
    880 void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig)
    881 {
    882     if (pid > 0) {
    883         kill(pid, sig);
    884     }
    885 }
    886 
    887 static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz)
    888 {
    889     struct timespec ts;
    890 
    891     int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
    892 
    893     if (res != 0) {
    894         return (jlong) 0;
    895     }
    896 
    897     nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
    898     return (jlong) nanoseconds_to_milliseconds(when);
    899 }
    900 
    901 static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid)
    902 {
    903     char filename[64];
    904 
    905     snprintf(filename, sizeof(filename), "/proc/%d/smaps", pid);
    906 
    907     FILE * file = fopen(filename, "r");
    908     if (!file) {
    909         return (jlong) -1;
    910     }
    911 
    912     // Tally up all of the Pss from the various maps
    913     char line[256];
    914     jlong pss = 0;
    915     while (fgets(line, sizeof(line), file)) {
    916         jlong v;
    917         if (sscanf(line, "Pss: %lld kB", &v) == 1) {
    918             pss += v;
    919         }
    920     }
    921 
    922     fclose(file);
    923 
    924     // Return the Pss value in bytes, not kilobytes
    925     return pss * 1024;
    926 }
    927 
    928 jintArray android_os_Process_getPidsForCommands(JNIEnv* env, jobject clazz,
    929         jobjectArray commandNames)
    930 {
    931     if (commandNames == NULL) {
    932         jniThrowNullPointerException(env, NULL);
    933         return NULL;
    934     }
    935 
    936     Vector<String8> commands;
    937 
    938     jsize count = env->GetArrayLength(commandNames);
    939 
    940     for (int i=0; i<count; i++) {
    941         jobject obj = env->GetObjectArrayElement(commandNames, i);
    942         if (obj != NULL) {
    943             const char* str8 = env->GetStringUTFChars((jstring)obj, NULL);
    944             if (str8 == NULL) {
    945                 jniThrowNullPointerException(env, "Element in commandNames");
    946                 return NULL;
    947             }
    948             commands.add(String8(str8));
    949             env->ReleaseStringUTFChars((jstring)obj, str8);
    950         } else {
    951             jniThrowNullPointerException(env, "Element in commandNames");
    952             return NULL;
    953         }
    954     }
    955 
    956     Vector<jint> pids;
    957 
    958     DIR *proc = opendir("/proc");
    959     if (proc == NULL) {
    960         fprintf(stderr, "/proc: %s\n", strerror(errno));
    961         return NULL;
    962     }
    963 
    964     struct dirent *d;
    965     while ((d = readdir(proc))) {
    966         int pid = atoi(d->d_name);
    967         if (pid <= 0) continue;
    968 
    969         char path[PATH_MAX];
    970         char data[PATH_MAX];
    971         snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
    972 
    973         int fd = open(path, O_RDONLY);
    974         if (fd < 0) {
    975             continue;
    976         }
    977         const int len = read(fd, data, sizeof(data)-1);
    978         close(fd);
    979 
    980         if (len < 0) {
    981             continue;
    982         }
    983         data[len] = 0;
    984 
    985         for (int i=0; i<len; i++) {
    986             if (data[i] == ' ') {
    987                 data[i] = 0;
    988                 break;
    989             }
    990         }
    991 
    992         for (size_t i=0; i<commands.size(); i++) {
    993             if (commands[i] == data) {
    994                 pids.add(pid);
    995                 break;
    996             }
    997         }
    998     }
    999 
   1000     closedir(proc);
   1001 
   1002     jintArray pidArray = env->NewIntArray(pids.size());
   1003     if (pidArray == NULL) {
   1004         jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
   1005         return NULL;
   1006     }
   1007 
   1008     if (pids.size() > 0) {
   1009         env->SetIntArrayRegion(pidArray, 0, pids.size(), pids.array());
   1010     }
   1011 
   1012     return pidArray;
   1013 }
   1014 
   1015 static const JNINativeMethod methods[] = {
   1016     {"getUidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName},
   1017     {"getGidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName},
   1018     {"setThreadPriority",   "(II)V", (void*)android_os_Process_setThreadPriority},
   1019     {"setThreadScheduler",  "(III)V", (void*)android_os_Process_setThreadScheduler},
   1020     {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground},
   1021     {"setThreadPriority",   "(I)V", (void*)android_os_Process_setCallingThreadPriority},
   1022     {"getThreadPriority",   "(I)I", (void*)android_os_Process_getThreadPriority},
   1023     {"setThreadGroup",      "(II)V", (void*)android_os_Process_setThreadGroup},
   1024     {"setProcessGroup",     "(II)V", (void*)android_os_Process_setProcessGroup},
   1025     {"getProcessGroup",     "(I)I", (void*)android_os_Process_getProcessGroup},
   1026     {"setOomAdj",   "(II)Z", (void*)android_os_Process_setOomAdj},
   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 };
   1044 
   1045 const char* const kProcessPathName = "android/os/Process";
   1046 
   1047 int register_android_os_Process(JNIEnv* env)
   1048 {
   1049     return AndroidRuntime::registerNativeMethods(
   1050         env, kProcessPathName,
   1051         methods, NELEM(methods));
   1052 }
   1053