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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 jint android_os_Process_getProcessGroup(JNIEnv* env, jobject clazz, jint pid)
    272 {
    273     SchedPolicy sp;
    274     if (get_sched_policy(pid, &sp) != 0) {
    275         signalExceptionForGroupError(env, errno);
    276     }
    277     return (int) sp;
    278 }
    279 
    280 static void android_os_Process_setCanSelfBackground(JNIEnv* env, jobject clazz, jboolean bgOk) {
    281     // Establishes the calling thread as illegal to put into the background.
    282     // Typically used only for the system process's main looper.
    283 #if GUARD_THREAD_PRIORITY
    284     ALOGV("Process.setCanSelfBackground(%d) : tid=%d", bgOk, androidGetTid());
    285     {
    286         Mutex::Autolock _l(gKeyCreateMutex);
    287         if (gBgKey == -1) {
    288             pthread_key_create(&gBgKey, NULL);
    289         }
    290     }
    291 
    292     // inverted:  not-okay, we set a sentinel value
    293     pthread_setspecific(gBgKey, (void*)(bgOk ? 0 : 0xbaad));
    294 #endif
    295 }
    296 
    297 void android_os_Process_setThreadScheduler(JNIEnv* env, jclass clazz,
    298                                               jint tid, jint policy, jint pri)
    299 {
    300 #ifdef HAVE_SCHED_SETSCHEDULER
    301     struct sched_param param;
    302     param.sched_priority = pri;
    303     int rc = sched_setscheduler(tid, policy, &param);
    304     if (rc) {
    305         signalExceptionForPriorityError(env, errno);
    306     }
    307 #else
    308     signalExceptionForPriorityError(env, ENOSYS);
    309 #endif
    310 }
    311 
    312 void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz,
    313                                               jint pid, jint pri)
    314 {
    315 #if GUARD_THREAD_PRIORITY
    316     // if we're putting the current thread into the background, check the TLS
    317     // to make sure this thread isn't guarded.  If it is, raise an exception.
    318     if (pri >= ANDROID_PRIORITY_BACKGROUND) {
    319         if (pid == androidGetTid()) {
    320             void* bgOk = pthread_getspecific(gBgKey);
    321             if (bgOk == ((void*)0xbaad)) {
    322                 ALOGE("Thread marked fg-only put self in background!");
    323                 jniThrowException(env, "java/lang/SecurityException", "May not put this thread into background");
    324                 return;
    325             }
    326         }
    327     }
    328 #endif
    329 
    330     int rc = androidSetThreadPriority(pid, pri);
    331     if (rc != 0) {
    332         if (rc == INVALID_OPERATION) {
    333             signalExceptionForPriorityError(env, errno);
    334         } else {
    335             signalExceptionForGroupError(env, errno);
    336         }
    337     }
    338 
    339     //ALOGI("Setting priority of %d: %d, getpriority returns %d\n",
    340     //     pid, pri, getpriority(PRIO_PROCESS, pid));
    341 }
    342 
    343 void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz,
    344                                                         jint pri)
    345 {
    346     jint tid = android_os_Process_myTid(env, clazz);
    347     android_os_Process_setThreadPriority(env, clazz, tid, pri);
    348 }
    349 
    350 jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz,
    351                                               jint pid)
    352 {
    353     errno = 0;
    354     jint pri = getpriority(PRIO_PROCESS, pid);
    355     if (errno != 0) {
    356         signalExceptionForPriorityError(env, errno);
    357     }
    358     //ALOGI("Returning priority of %d: %d\n", pid, pri);
    359     return pri;
    360 }
    361 
    362 jboolean android_os_Process_setOomAdj(JNIEnv* env, jobject clazz,
    363                                       jint pid, jint adj)
    364 {
    365 #ifdef HAVE_OOM_ADJ
    366     char text[64];
    367     sprintf(text, "/proc/%d/oom_adj", pid);
    368     int fd = open(text, O_WRONLY);
    369     if (fd >= 0) {
    370         sprintf(text, "%d", adj);
    371         write(fd, text, strlen(text));
    372         close(fd);
    373     }
    374     return true;
    375 #endif
    376     return false;
    377 }
    378 
    379 void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name)
    380 {
    381     if (name == NULL) {
    382         jniThrowNullPointerException(env, NULL);
    383         return;
    384     }
    385 
    386     const jchar* str = env->GetStringCritical(name, 0);
    387     String8 name8;
    388     if (str) {
    389         name8 = String8(str, env->GetStringLength(name));
    390         env->ReleaseStringCritical(name, str);
    391     }
    392 
    393     if (name8.size() > 0) {
    394         ProcessState::self()->setArgV0(name8.string());
    395     }
    396 }
    397 
    398 jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid)
    399 {
    400     return setuid(uid) == 0 ? 0 : errno;
    401 }
    402 
    403 jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid)
    404 {
    405     return setgid(uid) == 0 ? 0 : errno;
    406 }
    407 
    408 static int pid_compare(const void* v1, const void* v2)
    409 {
    410     //ALOGI("Compare %d vs %d\n", *((const jint*)v1), *((const jint*)v2));
    411     return *((const jint*)v1) - *((const jint*)v2);
    412 }
    413 
    414 static jlong getFreeMemoryImpl(const char* const sums[], const int sumsLen[], int num)
    415 {
    416     int fd = open("/proc/meminfo", O_RDONLY);
    417 
    418     if (fd < 0) {
    419         ALOGW("Unable to open /proc/meminfo");
    420         return -1;
    421     }
    422 
    423     char buffer[256];
    424     const int len = read(fd, buffer, sizeof(buffer)-1);
    425     close(fd);
    426 
    427     if (len < 0) {
    428         ALOGW("Unable to read /proc/meminfo");
    429         return -1;
    430     }
    431     buffer[len] = 0;
    432 
    433     int numFound = 0;
    434     jlong mem = 0;
    435 
    436     char* p = buffer;
    437     while (*p && numFound < num) {
    438         int i = 0;
    439         while (sums[i]) {
    440             if (strncmp(p, sums[i], sumsLen[i]) == 0) {
    441                 p += sumsLen[i];
    442                 while (*p == ' ') p++;
    443                 char* num = p;
    444                 while (*p >= '0' && *p <= '9') p++;
    445                 if (*p != 0) {
    446                     *p = 0;
    447                     p++;
    448                     if (*p == 0) p--;
    449                 }
    450                 mem += atoll(num) * 1024;
    451                 numFound++;
    452                 break;
    453             }
    454             i++;
    455         }
    456         p++;
    457     }
    458 
    459     return numFound > 0 ? mem : -1;
    460 }
    461 
    462 static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz)
    463 {
    464     static const char* const sums[] = { "MemFree:", "Cached:", NULL };
    465     static const int sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), 0 };
    466     return getFreeMemoryImpl(sums, sumsLen, 2);
    467 }
    468 
    469 static jlong android_os_Process_getTotalMemory(JNIEnv* env, jobject clazz)
    470 {
    471     static const char* const sums[] = { "MemTotal:", NULL };
    472     static const int sumsLen[] = { strlen("MemTotal:"), 0 };
    473     return getFreeMemoryImpl(sums, sumsLen, 1);
    474 }
    475 
    476 void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr,
    477                                       jobjectArray reqFields, jlongArray outFields)
    478 {
    479     //ALOGI("getMemInfo: %p %p", reqFields, outFields);
    480 
    481     if (fileStr == NULL || reqFields == NULL || outFields == NULL) {
    482         jniThrowNullPointerException(env, NULL);
    483         return;
    484     }
    485 
    486     const char* file8 = env->GetStringUTFChars(fileStr, NULL);
    487     if (file8 == NULL) {
    488         return;
    489     }
    490     String8 file(file8);
    491     env->ReleaseStringUTFChars(fileStr, file8);
    492 
    493     jsize count = env->GetArrayLength(reqFields);
    494     if (count > env->GetArrayLength(outFields)) {
    495         jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ");
    496         return;
    497     }
    498 
    499     Vector<String8> fields;
    500     int i;
    501 
    502     for (i=0; i<count; i++) {
    503         jobject obj = env->GetObjectArrayElement(reqFields, i);
    504         if (obj != NULL) {
    505             const char* str8 = env->GetStringUTFChars((jstring)obj, NULL);
    506             //ALOGI("String at %d: %p = %s", i, obj, str8);
    507             if (str8 == NULL) {
    508                 jniThrowNullPointerException(env, "Element in reqFields");
    509                 return;
    510             }
    511             fields.add(String8(str8));
    512             env->ReleaseStringUTFChars((jstring)obj, str8);
    513         } else {
    514             jniThrowNullPointerException(env, "Element in reqFields");
    515             return;
    516         }
    517     }
    518 
    519     jlong* sizesArray = env->GetLongArrayElements(outFields, 0);
    520     if (sizesArray == NULL) {
    521         return;
    522     }
    523 
    524     //ALOGI("Clearing %d sizes", count);
    525     for (i=0; i<count; i++) {
    526         sizesArray[i] = 0;
    527     }
    528 
    529     int fd = open(file.string(), O_RDONLY);
    530 
    531     if (fd >= 0) {
    532         const size_t BUFFER_SIZE = 2048;
    533         char* buffer = (char*)malloc(BUFFER_SIZE);
    534         int len = read(fd, buffer, BUFFER_SIZE-1);
    535         close(fd);
    536 
    537         if (len < 0) {
    538             ALOGW("Unable to read %s", file.string());
    539             len = 0;
    540         }
    541         buffer[len] = 0;
    542 
    543         int foundCount = 0;
    544 
    545         char* p = buffer;
    546         while (*p && foundCount < count) {
    547             bool skipToEol = true;
    548             //ALOGI("Parsing at: %s", p);
    549             for (i=0; i<count; i++) {
    550                 const String8& field = fields[i];
    551                 if (strncmp(p, field.string(), field.length()) == 0) {
    552                     p += field.length();
    553                     while (*p == ' ' || *p == '\t') p++;
    554                     char* num = p;
    555                     while (*p >= '0' && *p <= '9') p++;
    556                     skipToEol = *p != '\n';
    557                     if (*p != 0) {
    558                         *p = 0;
    559                         p++;
    560                     }
    561                     char* end;
    562                     sizesArray[i] = strtoll(num, &end, 10);
    563                     //ALOGI("Field %s = %d", field.string(), sizesArray[i]);
    564                     foundCount++;
    565                     break;
    566                 }
    567             }
    568             if (skipToEol) {
    569                 while (*p && *p != '\n') {
    570                     p++;
    571                 }
    572                 if (*p == '\n') {
    573                     p++;
    574                 }
    575             }
    576         }
    577 
    578         free(buffer);
    579     } else {
    580         ALOGW("Unable to open %s", file.string());
    581     }
    582 
    583     //ALOGI("Done!");
    584     env->ReleaseLongArrayElements(outFields, sizesArray, 0);
    585 }
    586 
    587 jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz,
    588                                      jstring file, jintArray lastArray)
    589 {
    590     if (file == NULL) {
    591         jniThrowNullPointerException(env, NULL);
    592         return NULL;
    593     }
    594 
    595     const char* file8 = env->GetStringUTFChars(file, NULL);
    596     if (file8 == NULL) {
    597         jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
    598         return NULL;
    599     }
    600 
    601     DIR* dirp = opendir(file8);
    602 
    603     env->ReleaseStringUTFChars(file, file8);
    604 
    605     if(dirp == NULL) {
    606         return NULL;
    607     }
    608 
    609     jsize curCount = 0;
    610     jint* curData = NULL;
    611     if (lastArray != NULL) {
    612         curCount = env->GetArrayLength(lastArray);
    613         curData = env->GetIntArrayElements(lastArray, 0);
    614     }
    615 
    616     jint curPos = 0;
    617 
    618     struct dirent* entry;
    619     while ((entry=readdir(dirp)) != NULL) {
    620         const char* p = entry->d_name;
    621         while (*p) {
    622             if (*p < '0' || *p > '9') break;
    623             p++;
    624         }
    625         if (*p != 0) continue;
    626 
    627         char* end;
    628         int pid = strtol(entry->d_name, &end, 10);
    629         //ALOGI("File %s pid=%d\n", entry->d_name, pid);
    630         if (curPos >= curCount) {
    631             jsize newCount = (curCount == 0) ? 10 : (curCount*2);
    632             jintArray newArray = env->NewIntArray(newCount);
    633             if (newArray == NULL) {
    634                 closedir(dirp);
    635                 jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
    636                 return NULL;
    637             }
    638             jint* newData = env->GetIntArrayElements(newArray, 0);
    639             if (curData != NULL) {
    640                 memcpy(newData, curData, sizeof(jint)*curCount);
    641                 env->ReleaseIntArrayElements(lastArray, curData, 0);
    642             }
    643             lastArray = newArray;
    644             curCount = newCount;
    645             curData = newData;
    646         }
    647 
    648         curData[curPos] = pid;
    649         curPos++;
    650     }
    651 
    652     closedir(dirp);
    653 
    654     if (curData != NULL && curPos > 0) {
    655         qsort(curData, curPos, sizeof(jint), pid_compare);
    656     }
    657 
    658     while (curPos < curCount) {
    659         curData[curPos] = -1;
    660         curPos++;
    661     }
    662 
    663     if (curData != NULL) {
    664         env->ReleaseIntArrayElements(lastArray, curData, 0);
    665     }
    666 
    667     return lastArray;
    668 }
    669 
    670 enum {
    671     PROC_TERM_MASK = 0xff,
    672     PROC_ZERO_TERM = 0,
    673     PROC_SPACE_TERM = ' ',
    674     PROC_COMBINE = 0x100,
    675     PROC_PARENS = 0x200,
    676     PROC_OUT_STRING = 0x1000,
    677     PROC_OUT_LONG = 0x2000,
    678     PROC_OUT_FLOAT = 0x4000,
    679 };
    680 
    681 jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz,
    682         char* buffer, jint startIndex, jint endIndex, jintArray format,
    683         jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
    684 {
    685 
    686     const jsize NF = env->GetArrayLength(format);
    687     const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0;
    688     const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0;
    689     const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0;
    690 
    691     jint* formatData = env->GetIntArrayElements(format, 0);
    692     jlong* longsData = outLongs ?
    693         env->GetLongArrayElements(outLongs, 0) : NULL;
    694     jfloat* floatsData = outFloats ?
    695         env->GetFloatArrayElements(outFloats, 0) : NULL;
    696     if (formatData == NULL || (NL > 0 && longsData == NULL)
    697             || (NR > 0 && floatsData == NULL)) {
    698         if (formatData != NULL) {
    699             env->ReleaseIntArrayElements(format, formatData, 0);
    700         }
    701         if (longsData != NULL) {
    702             env->ReleaseLongArrayElements(outLongs, longsData, 0);
    703         }
    704         if (floatsData != NULL) {
    705             env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
    706         }
    707         jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
    708         return JNI_FALSE;
    709     }
    710 
    711     jsize i = startIndex;
    712     jsize di = 0;
    713 
    714     jboolean res = JNI_TRUE;
    715 
    716     for (jsize fi=0; fi<NF; fi++) {
    717         const jint mode = formatData[fi];
    718         if ((mode&PROC_PARENS) != 0) {
    719             i++;
    720         }
    721         const char term = (char)(mode&PROC_TERM_MASK);
    722         const jsize start = i;
    723         if (i >= endIndex) {
    724             res = JNI_FALSE;
    725             break;
    726         }
    727 
    728         jsize end = -1;
    729         if ((mode&PROC_PARENS) != 0) {
    730             while (buffer[i] != ')' && i < endIndex) {
    731                 i++;
    732             }
    733             end = i;
    734             i++;
    735         }
    736         while (buffer[i] != term && i < endIndex) {
    737             i++;
    738         }
    739         if (end < 0) {
    740             end = i;
    741         }
    742 
    743         if (i < endIndex) {
    744             i++;
    745             if ((mode&PROC_COMBINE) != 0) {
    746                 while (buffer[i] == term && i < endIndex) {
    747                     i++;
    748                 }
    749             }
    750         }
    751 
    752         //ALOGI("Field %d: %d-%d dest=%d mode=0x%x\n", i, start, end, di, mode);
    753 
    754         if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) {
    755             char c = buffer[end];
    756             buffer[end] = 0;
    757             if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) {
    758                 char* end;
    759                 floatsData[di] = strtof(buffer+start, &end);
    760             }
    761             if ((mode&PROC_OUT_LONG) != 0 && di < NL) {
    762                 char* end;
    763                 longsData[di] = strtoll(buffer+start, &end, 10);
    764             }
    765             if ((mode&PROC_OUT_STRING) != 0 && di < NS) {
    766                 jstring str = env->NewStringUTF(buffer+start);
    767                 env->SetObjectArrayElement(outStrings, di, str);
    768             }
    769             buffer[end] = c;
    770             di++;
    771         }
    772     }
    773 
    774     env->ReleaseIntArrayElements(format, formatData, 0);
    775     if (longsData != NULL) {
    776         env->ReleaseLongArrayElements(outLongs, longsData, 0);
    777     }
    778     if (floatsData != NULL) {
    779         env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
    780     }
    781 
    782     return res;
    783 }
    784 
    785 jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz,
    786         jbyteArray buffer, jint startIndex, jint endIndex, jintArray format,
    787         jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
    788 {
    789         jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL);
    790 
    791         jboolean result = android_os_Process_parseProcLineArray(env, clazz,
    792                 (char*) bufferArray, startIndex, endIndex, format, outStrings,
    793                 outLongs, outFloats);
    794 
    795         env->ReleaseByteArrayElements(buffer, bufferArray, 0);
    796 
    797         return result;
    798 }
    799 
    800 jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz,
    801         jstring file, jintArray format, jobjectArray outStrings,
    802         jlongArray outLongs, jfloatArray outFloats)
    803 {
    804     if (file == NULL || format == NULL) {
    805         jniThrowNullPointerException(env, NULL);
    806         return JNI_FALSE;
    807     }
    808 
    809     const char* file8 = env->GetStringUTFChars(file, NULL);
    810     if (file8 == NULL) {
    811         jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
    812         return JNI_FALSE;
    813     }
    814     int fd = open(file8, O_RDONLY);
    815     env->ReleaseStringUTFChars(file, file8);
    816 
    817     if (fd < 0) {
    818         //ALOGW("Unable to open process file: %s\n", file8);
    819         return JNI_FALSE;
    820     }
    821 
    822     char buffer[256];
    823     const int len = read(fd, buffer, sizeof(buffer)-1);
    824     close(fd);
    825 
    826     if (len < 0) {
    827         //ALOGW("Unable to open process file: %s fd=%d\n", file8, fd);
    828         return JNI_FALSE;
    829     }
    830     buffer[len] = 0;
    831 
    832     return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len,
    833             format, outStrings, outLongs, outFloats);
    834 
    835 }
    836 
    837 void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz,
    838                                              jobject binderObject)
    839 {
    840     if (binderObject == NULL) {
    841         jniThrowNullPointerException(env, NULL);
    842         return;
    843     }
    844 
    845     sp<IBinder> binder = ibinderForJavaObject(env, binderObject);
    846 }
    847 
    848 void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig)
    849 {
    850     if (pid > 0) {
    851         ALOGI("Sending signal. PID: %d SIG: %d", pid, sig);
    852         kill(pid, sig);
    853     }
    854 }
    855 
    856 void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig)
    857 {
    858     if (pid > 0) {
    859         kill(pid, sig);
    860     }
    861 }
    862 
    863 static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz)
    864 {
    865     struct timespec ts;
    866 
    867     int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
    868 
    869     if (res != 0) {
    870         return (jlong) 0;
    871     }
    872 
    873     nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
    874     return (jlong) nanoseconds_to_milliseconds(when);
    875 }
    876 
    877 static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid)
    878 {
    879     char filename[64];
    880 
    881     snprintf(filename, sizeof(filename), "/proc/%d/smaps", pid);
    882 
    883     FILE * file = fopen(filename, "r");
    884     if (!file) {
    885         return (jlong) -1;
    886     }
    887 
    888     // Tally up all of the Pss from the various maps
    889     char line[256];
    890     jlong pss = 0;
    891     while (fgets(line, sizeof(line), file)) {
    892         jlong v;
    893         if (sscanf(line, "Pss: %lld kB", &v) == 1) {
    894             pss += v;
    895         }
    896     }
    897 
    898     fclose(file);
    899 
    900     // Return the Pss value in bytes, not kilobytes
    901     return pss * 1024;
    902 }
    903 
    904 jintArray android_os_Process_getPidsForCommands(JNIEnv* env, jobject clazz,
    905         jobjectArray commandNames)
    906 {
    907     if (commandNames == NULL) {
    908         jniThrowNullPointerException(env, NULL);
    909         return NULL;
    910     }
    911 
    912     Vector<String8> commands;
    913 
    914     jsize count = env->GetArrayLength(commandNames);
    915 
    916     for (int i=0; i<count; i++) {
    917         jobject obj = env->GetObjectArrayElement(commandNames, i);
    918         if (obj != NULL) {
    919             const char* str8 = env->GetStringUTFChars((jstring)obj, NULL);
    920             if (str8 == NULL) {
    921                 jniThrowNullPointerException(env, "Element in commandNames");
    922                 return NULL;
    923             }
    924             commands.add(String8(str8));
    925             env->ReleaseStringUTFChars((jstring)obj, str8);
    926         } else {
    927             jniThrowNullPointerException(env, "Element in commandNames");
    928             return NULL;
    929         }
    930     }
    931 
    932     Vector<jint> pids;
    933 
    934     DIR *proc = opendir("/proc");
    935     if (proc == NULL) {
    936         fprintf(stderr, "/proc: %s\n", strerror(errno));
    937         return NULL;
    938     }
    939 
    940     struct dirent *d;
    941     while ((d = readdir(proc))) {
    942         int pid = atoi(d->d_name);
    943         if (pid <= 0) continue;
    944 
    945         char path[PATH_MAX];
    946         char data[PATH_MAX];
    947         snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
    948 
    949         int fd = open(path, O_RDONLY);
    950         if (fd < 0) {
    951             continue;
    952         }
    953         const int len = read(fd, data, sizeof(data)-1);
    954         close(fd);
    955 
    956         if (len < 0) {
    957             continue;
    958         }
    959         data[len] = 0;
    960 
    961         for (int i=0; i<len; i++) {
    962             if (data[i] == ' ') {
    963                 data[i] = 0;
    964                 break;
    965             }
    966         }
    967 
    968         for (size_t i=0; i<commands.size(); i++) {
    969             if (commands[i] == data) {
    970                 pids.add(pid);
    971                 break;
    972             }
    973         }
    974     }
    975 
    976     closedir(proc);
    977 
    978     jintArray pidArray = env->NewIntArray(pids.size());
    979     if (pidArray == NULL) {
    980         jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
    981         return NULL;
    982     }
    983 
    984     if (pids.size() > 0) {
    985         env->SetIntArrayRegion(pidArray, 0, pids.size(), pids.array());
    986     }
    987 
    988     return pidArray;
    989 }
    990 
    991 static const JNINativeMethod methods[] = {
    992     {"myPid",       "()I", (void*)android_os_Process_myPid},
    993     {"myTid",       "()I", (void*)android_os_Process_myTid},
    994     {"myUid",       "()I", (void*)android_os_Process_myUid},
    995     {"getUidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName},
    996     {"getGidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName},
    997     {"setThreadPriority",   "(II)V", (void*)android_os_Process_setThreadPriority},
    998     {"setThreadScheduler",  "(III)V", (void*)android_os_Process_setThreadScheduler},
    999     {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground},
   1000     {"setThreadPriority",   "(I)V", (void*)android_os_Process_setCallingThreadPriority},
   1001     {"getThreadPriority",   "(I)I", (void*)android_os_Process_getThreadPriority},
   1002     {"setThreadGroup",      "(II)V", (void*)android_os_Process_setThreadGroup},
   1003     {"setProcessGroup",     "(II)V", (void*)android_os_Process_setProcessGroup},
   1004     {"getProcessGroup",     "(I)I", (void*)android_os_Process_getProcessGroup},
   1005     {"setOomAdj",   "(II)Z", (void*)android_os_Process_setOomAdj},
   1006     {"setArgV0",    "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0},
   1007     {"setUid", "(I)I", (void*)android_os_Process_setUid},
   1008     {"setGid", "(I)I", (void*)android_os_Process_setGid},
   1009     {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal},
   1010     {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet},
   1011     {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory},
   1012     {"getTotalMemory", "()J", (void*)android_os_Process_getTotalMemory},
   1013     {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines},
   1014     {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids},
   1015     {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile},
   1016     {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine},
   1017     {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime},
   1018     {"getPss", "(I)J", (void*)android_os_Process_getPss},
   1019     {"getPidsForCommands", "([Ljava/lang/String;)[I", (void*)android_os_Process_getPidsForCommands},
   1020     //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject},
   1021 };
   1022 
   1023 const char* const kProcessPathName = "android/os/Process";
   1024 
   1025 int register_android_os_Process(JNIEnv* env)
   1026 {
   1027     return AndroidRuntime::registerNativeMethods(
   1028         env, kProcessPathName,
   1029         methods, NELEM(methods));
   1030 }
   1031