android_util_Process.cpp revision 59325eb31f25704bb88c348160bb69e7c1aa3b48 
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
46using namespace android;
47
48#if GUARD_THREAD_PRIORITY
49Mutex gKeyCreateMutex;
50static 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
55static 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
76static 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
97jint android_os_Process_myPid(JNIEnv* env, jobject clazz)
98{
99    return getpid();
100}
101
102jint android_os_Process_myUid(JNIEnv* env, jobject clazz)
103{
104    return getuid();
105}
106
107jint android_os_Process_myTid(JNIEnv* env, jobject clazz)
108{
109    return androidGetTid();
110}
111
112jint 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
143jint 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
174void 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
184void 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
271static 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
288void 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
303void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz,
304                                              jint pid, jint pri)
305{
306#if GUARD_THREAD_PRIORITY
307    // if we're putting the current thread into the background, check the TLS
308    // to make sure this thread isn't guarded.  If it is, raise an exception.
309    if (pri >= ANDROID_PRIORITY_BACKGROUND) {
310        if (pid == 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
334void 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
341jint 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
353jboolean 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
370void 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
389jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid)
390{
391    return setuid(uid) == 0 ? 0 : errno;
392}
393
394jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid)
395{
396    return setgid(uid) == 0 ? 0 : errno;
397}
398
399static 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
405static 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
453static 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
460static 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
467void 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
578jintArray 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
661enum {
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
672jboolean 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
776jboolean 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
791jboolean 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
828void 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
839void 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
847void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig)
848{
849    if (pid > 0) {
850        kill(pid, sig);
851    }
852}
853
854static 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
868static 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
895static const JNINativeMethod methods[] = {
896    {"myPid",       "()I", (void*)android_os_Process_myPid},
897    {"myTid",       "()I", (void*)android_os_Process_myTid},
898    {"myUid",       "()I", (void*)android_os_Process_myUid},
899    {"getUidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName},
900    {"getGidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName},
901    {"setThreadPriority",   "(II)V", (void*)android_os_Process_setThreadPriority},
902    {"setThreadScheduler",  "(III)V", (void*)android_os_Process_setThreadScheduler},
903    {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground},
904    {"setThreadPriority",   "(I)V", (void*)android_os_Process_setCallingThreadPriority},
905    {"getThreadPriority",   "(I)I", (void*)android_os_Process_getThreadPriority},
906    {"setThreadGroup",      "(II)V", (void*)android_os_Process_setThreadGroup},
907    {"setProcessGroup",      "(II)V", (void*)android_os_Process_setProcessGroup},
908    {"setOomAdj",   "(II)Z", (void*)android_os_Process_setOomAdj},
909    {"setArgV0",    "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0},
910    {"setUid", "(I)I", (void*)android_os_Process_setUid},
911    {"setGid", "(I)I", (void*)android_os_Process_setGid},
912    {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal},
913    {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet},
914    {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory},
915    {"getTotalMemory", "()J", (void*)android_os_Process_getTotalMemory},
916    {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines},
917    {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids},
918    {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile},
919    {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine},
920    {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime},
921    {"getPss", "(I)J", (void*)android_os_Process_getPss},
922    //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject},
923};
924
925const char* const kProcessPathName = "android/os/Process";
926
927int register_android_os_Process(JNIEnv* env)
928{
929    return AndroidRuntime::registerNativeMethods(
930        env, kProcessPathName,
931        methods, NELEM(methods));
932}
933