android_util_Process.cpp revision 69a017bc1d1649350f830dfada5c6ed5eac0b770 
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 <utils/String8.h>
25#include <utils/Vector.h>
26
27#include <android_runtime/AndroidRuntime.h>
28
29#include "android_util_Binder.h"
30#include "JNIHelp.h"
31
32#include <sys/errno.h>
33#include <sys/resource.h>
34#include <sys/types.h>
35#include <cutils/sched_policy.h>
36#include <dirent.h>
37#include <fcntl.h>
38#include <grp.h>
39#include <pwd.h>
40#include <signal.h>
41
42/* desktop Linux needs a little help with gettid() */
43#if defined(HAVE_GETTID) && !defined(HAVE_ANDROID_OS)
44#define __KERNEL__
45# include <linux/unistd.h>
46#ifdef _syscall0
47_syscall0(pid_t,gettid)
48#else
49pid_t gettid() { return syscall(__NR_gettid);}
50#endif
51#undef __KERNEL__
52#endif
53
54#define POLICY_DEBUG 0
55#define GUARD_THREAD_PRIORITY 0
56
57using namespace android;
58
59#if GUARD_THREAD_PRIORITY
60Mutex gKeyCreateMutex;
61static pthread_key_t gBgKey = -1;
62#endif
63
64static void signalExceptionForPriorityError(JNIEnv* env, jobject obj, int err)
65{
66    switch (err) {
67        case EINVAL:
68            jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
69            break;
70        case ESRCH:
71            jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist");
72            break;
73        case EPERM:
74            jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread");
75            break;
76        case EACCES:
77            jniThrowException(env, "java/lang/SecurityException", "No permission to set to given priority");
78            break;
79        default:
80            jniThrowException(env, "java/lang/RuntimeException", "Unknown error");
81            break;
82    }
83}
84
85static void signalExceptionForGroupError(JNIEnv* env, jobject obj, int err)
86{
87    switch (err) {
88        case EINVAL:
89            jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
90            break;
91        case ESRCH:
92            jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist");
93            break;
94        case EPERM:
95            jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread");
96            break;
97        case EACCES:
98            jniThrowException(env, "java/lang/SecurityException", "No permission to set to given group");
99            break;
100        default:
101            jniThrowException(env, "java/lang/RuntimeException", "Unknown error");
102            break;
103    }
104}
105
106
107static void fakeProcessEntry(void* arg)
108{
109    String8* cls = (String8*)arg;
110
111    AndroidRuntime* jr = AndroidRuntime::getRuntime();
112    jr->callMain(cls->string(), 0, NULL);
113
114    delete cls;
115}
116
117jint android_os_Process_myPid(JNIEnv* env, jobject clazz)
118{
119    return getpid();
120}
121
122jint android_os_Process_myUid(JNIEnv* env, jobject clazz)
123{
124    return getuid();
125}
126
127jint android_os_Process_myTid(JNIEnv* env, jobject clazz)
128{
129    return androidGetTid();
130}
131
132jint android_os_Process_getUidForName(JNIEnv* env, jobject clazz, jstring name)
133{
134    if (name == NULL) {
135        jniThrowNullPointerException(env, NULL);
136        return -1;
137    }
138
139    const jchar* str16 = env->GetStringCritical(name, 0);
140    String8 name8;
141    if (str16) {
142        name8 = String8(str16, env->GetStringLength(name));
143        env->ReleaseStringCritical(name, str16);
144    }
145
146    const size_t N = name8.size();
147    if (N > 0) {
148        const char* str = name8.string();
149        for (size_t i=0; i<N; i++) {
150            if (str[i] < '0' || str[i] > '9') {
151                struct passwd* pwd = getpwnam(str);
152                if (pwd == NULL) {
153                    return -1;
154                }
155                return pwd->pw_uid;
156            }
157        }
158        return atoi(str);
159    }
160    return -1;
161}
162
163jint android_os_Process_getGidForName(JNIEnv* env, jobject clazz, jstring name)
164{
165    if (name == NULL) {
166        jniThrowNullPointerException(env, NULL);
167        return -1;
168    }
169
170    const jchar* str16 = env->GetStringCritical(name, 0);
171    String8 name8;
172    if (str16) {
173        name8 = String8(str16, env->GetStringLength(name));
174        env->ReleaseStringCritical(name, str16);
175    }
176
177    const size_t N = name8.size();
178    if (N > 0) {
179        const char* str = name8.string();
180        for (size_t i=0; i<N; i++) {
181            if (str[i] < '0' || str[i] > '9') {
182                struct group* grp = getgrnam(str);
183                if (grp == NULL) {
184                    return -1;
185                }
186                return grp->gr_gid;
187            }
188        }
189        return atoi(str);
190    }
191    return -1;
192}
193
194void android_os_Process_setThreadGroup(JNIEnv* env, jobject clazz, int pid, jint grp)
195{
196    int res = androidSetThreadSchedulingGroup(pid, grp);
197    if (res != NO_ERROR) {
198        signalExceptionForGroupError(env, clazz, res == BAD_VALUE ? EINVAL : errno);
199        return;
200    }
201}
202
203void android_os_Process_setProcessGroup(JNIEnv* env, jobject clazz, int pid, jint grp)
204{
205    DIR *d;
206    FILE *fp;
207    char proc_path[255];
208    struct dirent *de;
209
210    if (grp > ANDROID_TGROUP_MAX || grp < 0) {
211        signalExceptionForGroupError(env, clazz, EINVAL);
212        return;
213    }
214
215#if POLICY_DEBUG
216    char cmdline[32];
217    int fd;
218
219    strcpy(cmdline, "unknown");
220
221    sprintf(proc_path, "/proc/%d/cmdline", pid);
222    fd = open(proc_path, O_RDONLY);
223    if (fd >= 0) {
224        int rc = read(fd, cmdline, sizeof(cmdline)-1);
225        cmdline[rc] = 0;
226        close(fd);
227    }
228
229    if (grp == ANDROID_TGROUP_BG_NONINTERACT) {
230        LOGD("setProcessGroup: vvv pid %d (%s)", pid, cmdline);
231    } else {
232        LOGD("setProcessGroup: ^^^ pid %d (%s)", pid, cmdline);
233    }
234#endif
235    sprintf(proc_path, "/proc/%d/task", pid);
236    if (!(d = opendir(proc_path))) {
237        // If the process exited on us, don't generate an exception
238        if (errno != ENOENT)
239            signalExceptionForGroupError(env, clazz, errno);
240        return;
241    }
242
243    while ((de = readdir(d))) {
244        int t_pid;
245        int t_pri;
246
247        if (de->d_name[0] == '.')
248            continue;
249        t_pid = atoi(de->d_name);
250
251        if (!t_pid) {
252            LOGE("Error getting pid for '%s'\n", de->d_name);
253            continue;
254        }
255
256        t_pri = getpriority(PRIO_PROCESS, t_pid);
257
258        if (grp == ANDROID_TGROUP_DEFAULT &&
259            t_pri >= ANDROID_PRIORITY_BACKGROUND) {
260            // This task wants to stay at background
261            continue;
262        }
263
264        if (androidSetThreadSchedulingGroup(t_pid, grp) != NO_ERROR) {
265            signalExceptionForGroupError(env, clazz, errno);
266            break;
267        }
268    }
269    closedir(d);
270}
271
272static void android_os_Process_setCanSelfBackground(JNIEnv* env, jobject clazz, jboolean bgOk) {
273    // Establishes the calling thread as illegal to put into the background.
274    // Typically used only for the system process's main looper.
275#if GUARD_THREAD_PRIORITY
276    LOGV("Process.setCanSelfBackground(%d) : tid=%d", bgOk, androidGetTid());
277    {
278        Mutex::Autolock _l(gKeyCreateMutex);
279        if (gBgKey == -1) {
280            pthread_key_create(&gBgKey, NULL);
281        }
282    }
283
284    // inverted:  not-okay, we set a sentinel value
285    pthread_setspecific(gBgKey, (void*)(bgOk ? 0 : 0xbaad));
286#endif
287}
288
289void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz,
290                                              jint pid, jint pri)
291{
292#if GUARD_THREAD_PRIORITY
293    // if we're putting the current thread into the background, check the TLS
294    // to make sure this thread isn't guarded.  If it is, raise an exception.
295    if (pri >= ANDROID_PRIORITY_BACKGROUND) {
296        if (pid == androidGetTid()) {
297            void* bgOk = pthread_getspecific(gBgKey);
298            if (bgOk == ((void*)0xbaad)) {
299                LOGE("Thread marked fg-only put self in background!");
300                jniThrowException(env, "java/lang/SecurityException", "May not put this thread into background");
301                return;
302            }
303        }
304    }
305#endif
306
307    int rc = androidSetThreadPriority(pid, pri);
308    if (rc != 0) {
309        if (rc == INVALID_OPERATION) {
310            signalExceptionForPriorityError(env, clazz, errno);
311        } else {
312            signalExceptionForGroupError(env, clazz, errno);
313        }
314    }
315
316    //LOGI("Setting priority of %d: %d, getpriority returns %d\n",
317    //     pid, pri, getpriority(PRIO_PROCESS, pid));
318}
319
320void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz,
321                                                        jint pri)
322{
323    jint tid = android_os_Process_myTid(env, clazz);
324    android_os_Process_setThreadPriority(env, clazz, tid, pri);
325}
326
327jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz,
328                                              jint pid)
329{
330    errno = 0;
331    jint pri = getpriority(PRIO_PROCESS, pid);
332    if (errno != 0) {
333        signalExceptionForPriorityError(env, clazz, errno);
334    }
335    //LOGI("Returning priority of %d: %d\n", pid, pri);
336    return pri;
337}
338
339jboolean android_os_Process_setOomAdj(JNIEnv* env, jobject clazz,
340                                      jint pid, jint adj)
341{
342#ifdef HAVE_OOM_ADJ
343    if (ProcessState::self()->supportsProcesses()) {
344        char text[64];
345        sprintf(text, "/proc/%d/oom_adj", pid);
346        int fd = open(text, O_WRONLY);
347        if (fd >= 0) {
348            sprintf(text, "%d", adj);
349            write(fd, text, strlen(text));
350            close(fd);
351        }
352        return true;
353    }
354#endif
355    return false;
356}
357
358void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name)
359{
360    if (name == NULL) {
361        jniThrowNullPointerException(env, NULL);
362        return;
363    }
364
365    const jchar* str = env->GetStringCritical(name, 0);
366    String8 name8;
367    if (str) {
368        name8 = String8(str, env->GetStringLength(name));
369        env->ReleaseStringCritical(name, str);
370    }
371
372    if (name8.size() > 0) {
373        ProcessState::self()->setArgV0(name8.string());
374    }
375}
376
377jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid)
378{
379    #if HAVE_ANDROID_OS
380    return setuid(uid) == 0 ? 0 : errno;
381    #else
382    return ENOSYS;
383    #endif
384}
385
386jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid)
387{
388    #if HAVE_ANDROID_OS
389    return setgid(uid) == 0 ? 0 : errno;
390    #else
391    return ENOSYS;
392    #endif
393}
394
395jboolean android_os_Process_supportsProcesses(JNIEnv* env, jobject clazz)
396{
397    return ProcessState::self()->supportsProcesses();
398}
399
400static int pid_compare(const void* v1, const void* v2)
401{
402    //LOGI("Compare %d vs %d\n", *((const jint*)v1), *((const jint*)v2));
403    return *((const jint*)v1) - *((const jint*)v2);
404}
405
406static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz)
407{
408    int fd = open("/proc/meminfo", O_RDONLY);
409
410    if (fd < 0) {
411        LOGW("Unable to open /proc/meminfo");
412        return -1;
413    }
414
415    char buffer[256];
416    const int len = read(fd, buffer, sizeof(buffer)-1);
417    close(fd);
418
419    if (len < 0) {
420        LOGW("Unable to read /proc/meminfo");
421        return -1;
422    }
423    buffer[len] = 0;
424
425    int numFound = 0;
426    jlong mem = 0;
427
428    static const char* const sums[] = { "MemFree:", "Cached:", NULL };
429    static const int sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), NULL };
430
431    char* p = buffer;
432    while (*p && numFound < 2) {
433        int i = 0;
434        while (sums[i]) {
435            if (strncmp(p, sums[i], sumsLen[i]) == 0) {
436                p += sumsLen[i];
437                while (*p == ' ') p++;
438                char* num = p;
439                while (*p >= '0' && *p <= '9') p++;
440                if (*p != 0) {
441                    *p = 0;
442                    p++;
443                    if (*p == 0) p--;
444                }
445                mem += atoll(num) * 1024;
446                numFound++;
447                break;
448            }
449            i++;
450        }
451        p++;
452    }
453
454    return numFound > 0 ? mem : -1;
455}
456
457void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr,
458                                      jobjectArray reqFields, jlongArray outFields)
459{
460    //LOGI("getMemInfo: %p %p", reqFields, outFields);
461
462    if (fileStr == NULL || reqFields == NULL || outFields == NULL) {
463        jniThrowNullPointerException(env, NULL);
464        return;
465    }
466
467    const char* file8 = env->GetStringUTFChars(fileStr, NULL);
468    if (file8 == NULL) {
469        return;
470    }
471    String8 file(file8);
472    env->ReleaseStringUTFChars(fileStr, file8);
473
474    jsize count = env->GetArrayLength(reqFields);
475    if (count > env->GetArrayLength(outFields)) {
476        jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ");
477        return;
478    }
479
480    Vector<String8> fields;
481    int i;
482
483    for (i=0; i<count; i++) {
484        jobject obj = env->GetObjectArrayElement(reqFields, i);
485        if (obj != NULL) {
486            const char* str8 = env->GetStringUTFChars((jstring)obj, NULL);
487            //LOGI("String at %d: %p = %s", i, obj, str8);
488            if (str8 == NULL) {
489                jniThrowNullPointerException(env, "Element in reqFields");
490                return;
491            }
492            fields.add(String8(str8));
493            env->ReleaseStringUTFChars((jstring)obj, str8);
494        } else {
495            jniThrowNullPointerException(env, "Element in reqFields");
496            return;
497        }
498    }
499
500    jlong* sizesArray = env->GetLongArrayElements(outFields, 0);
501    if (sizesArray == NULL) {
502        return;
503    }
504
505    //LOGI("Clearing %d sizes", count);
506    for (i=0; i<count; i++) {
507        sizesArray[i] = 0;
508    }
509
510    int fd = open(file.string(), O_RDONLY);
511
512    if (fd >= 0) {
513        const size_t BUFFER_SIZE = 2048;
514        char* buffer = (char*)malloc(BUFFER_SIZE);
515        int len = read(fd, buffer, BUFFER_SIZE-1);
516        close(fd);
517
518        if (len < 0) {
519            LOGW("Unable to read %s", file.string());
520            len = 0;
521        }
522        buffer[len] = 0;
523
524        int foundCount = 0;
525
526        char* p = buffer;
527        while (*p && foundCount < count) {
528            bool skipToEol = true;
529            //LOGI("Parsing at: %s", p);
530            for (i=0; i<count; i++) {
531                const String8& field = fields[i];
532                if (strncmp(p, field.string(), field.length()) == 0) {
533                    p += field.length();
534                    while (*p == ' ' || *p == '\t') p++;
535                    char* num = p;
536                    while (*p >= '0' && *p <= '9') p++;
537                    skipToEol = *p != '\n';
538                    if (*p != 0) {
539                        *p = 0;
540                        p++;
541                    }
542                    char* end;
543                    sizesArray[i] = strtoll(num, &end, 10);
544                    //LOGI("Field %s = %d", field.string(), sizesArray[i]);
545                    foundCount++;
546                    break;
547                }
548            }
549            if (skipToEol) {
550                while (*p && *p != '\n') {
551                    p++;
552                }
553                if (*p == '\n') {
554                    p++;
555                }
556            }
557        }
558
559        free(buffer);
560    } else {
561        LOGW("Unable to open %s", file.string());
562    }
563
564    //LOGI("Done!");
565    env->ReleaseLongArrayElements(outFields, sizesArray, 0);
566}
567
568jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz,
569                                     jstring file, jintArray lastArray)
570{
571    if (file == NULL) {
572        jniThrowNullPointerException(env, NULL);
573        return NULL;
574    }
575
576    const char* file8 = env->GetStringUTFChars(file, NULL);
577    if (file8 == NULL) {
578        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
579        return NULL;
580    }
581
582    DIR* dirp = opendir(file8);
583
584    env->ReleaseStringUTFChars(file, file8);
585
586    if(dirp == NULL) {
587        return NULL;
588    }
589
590    jsize curCount = 0;
591    jint* curData = NULL;
592    if (lastArray != NULL) {
593        curCount = env->GetArrayLength(lastArray);
594        curData = env->GetIntArrayElements(lastArray, 0);
595    }
596
597    jint curPos = 0;
598
599    struct dirent* entry;
600    while ((entry=readdir(dirp)) != NULL) {
601        const char* p = entry->d_name;
602        while (*p) {
603            if (*p < '0' || *p > '9') break;
604            p++;
605        }
606        if (*p != 0) continue;
607
608        char* end;
609        int pid = strtol(entry->d_name, &end, 10);
610        //LOGI("File %s pid=%d\n", entry->d_name, pid);
611        if (curPos >= curCount) {
612            jsize newCount = (curCount == 0) ? 10 : (curCount*2);
613            jintArray newArray = env->NewIntArray(newCount);
614            if (newArray == NULL) {
615                closedir(dirp);
616                jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
617                return NULL;
618            }
619            jint* newData = env->GetIntArrayElements(newArray, 0);
620            if (curData != NULL) {
621                memcpy(newData, curData, sizeof(jint)*curCount);
622                env->ReleaseIntArrayElements(lastArray, curData, 0);
623            }
624            lastArray = newArray;
625            curCount = newCount;
626            curData = newData;
627        }
628
629        curData[curPos] = pid;
630        curPos++;
631    }
632
633    closedir(dirp);
634
635    if (curData != NULL && curPos > 0) {
636        qsort(curData, curPos, sizeof(jint), pid_compare);
637    }
638
639    while (curPos < curCount) {
640        curData[curPos] = -1;
641        curPos++;
642    }
643
644    if (curData != NULL) {
645        env->ReleaseIntArrayElements(lastArray, curData, 0);
646    }
647
648    return lastArray;
649}
650
651enum {
652    PROC_TERM_MASK = 0xff,
653    PROC_ZERO_TERM = 0,
654    PROC_SPACE_TERM = ' ',
655    PROC_COMBINE = 0x100,
656    PROC_PARENS = 0x200,
657    PROC_OUT_STRING = 0x1000,
658    PROC_OUT_LONG = 0x2000,
659    PROC_OUT_FLOAT = 0x4000,
660};
661
662jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz,
663        char* buffer, jint startIndex, jint endIndex, jintArray format,
664        jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
665{
666
667    const jsize NF = env->GetArrayLength(format);
668    const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0;
669    const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0;
670    const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0;
671
672    jint* formatData = env->GetIntArrayElements(format, 0);
673    jlong* longsData = outLongs ?
674        env->GetLongArrayElements(outLongs, 0) : NULL;
675    jfloat* floatsData = outFloats ?
676        env->GetFloatArrayElements(outFloats, 0) : NULL;
677    if (formatData == NULL || (NL > 0 && longsData == NULL)
678            || (NR > 0 && floatsData == NULL)) {
679        if (formatData != NULL) {
680            env->ReleaseIntArrayElements(format, formatData, 0);
681        }
682        if (longsData != NULL) {
683            env->ReleaseLongArrayElements(outLongs, longsData, 0);
684        }
685        if (floatsData != NULL) {
686            env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
687        }
688        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
689        return JNI_FALSE;
690    }
691
692    jsize i = startIndex;
693    jsize di = 0;
694
695    jboolean res = JNI_TRUE;
696
697    for (jsize fi=0; fi<NF; fi++) {
698        const jint mode = formatData[fi];
699        if ((mode&PROC_PARENS) != 0) {
700            i++;
701        }
702        const char term = (char)(mode&PROC_TERM_MASK);
703        const jsize start = i;
704        if (i >= endIndex) {
705            res = JNI_FALSE;
706            break;
707        }
708
709        jsize end = -1;
710        if ((mode&PROC_PARENS) != 0) {
711            while (buffer[i] != ')' && i < endIndex) {
712                i++;
713            }
714            end = i;
715            i++;
716        }
717        while (buffer[i] != term && i < endIndex) {
718            i++;
719        }
720        if (end < 0) {
721            end = i;
722        }
723
724        if (i < endIndex) {
725            i++;
726            if ((mode&PROC_COMBINE) != 0) {
727                while (buffer[i] == term && i < endIndex) {
728                    i++;
729                }
730            }
731        }
732
733        //LOGI("Field %d: %d-%d dest=%d mode=0x%x\n", i, start, end, di, mode);
734
735        if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) {
736            char c = buffer[end];
737            buffer[end] = 0;
738            if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) {
739                char* end;
740                floatsData[di] = strtof(buffer+start, &end);
741            }
742            if ((mode&PROC_OUT_LONG) != 0 && di < NL) {
743                char* end;
744                longsData[di] = strtoll(buffer+start, &end, 10);
745            }
746            if ((mode&PROC_OUT_STRING) != 0 && di < NS) {
747                jstring str = env->NewStringUTF(buffer+start);
748                env->SetObjectArrayElement(outStrings, di, str);
749            }
750            buffer[end] = c;
751            di++;
752        }
753    }
754
755    env->ReleaseIntArrayElements(format, formatData, 0);
756    if (longsData != NULL) {
757        env->ReleaseLongArrayElements(outLongs, longsData, 0);
758    }
759    if (floatsData != NULL) {
760        env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
761    }
762
763    return res;
764}
765
766jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz,
767        jbyteArray buffer, jint startIndex, jint endIndex, jintArray format,
768        jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
769{
770        jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL);
771
772        jboolean result = android_os_Process_parseProcLineArray(env, clazz,
773                (char*) bufferArray, startIndex, endIndex, format, outStrings,
774                outLongs, outFloats);
775
776        env->ReleaseByteArrayElements(buffer, bufferArray, 0);
777
778        return result;
779}
780
781jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz,
782        jstring file, jintArray format, jobjectArray outStrings,
783        jlongArray outLongs, jfloatArray outFloats)
784{
785    if (file == NULL || format == NULL) {
786        jniThrowNullPointerException(env, NULL);
787        return JNI_FALSE;
788    }
789
790    const char* file8 = env->GetStringUTFChars(file, NULL);
791    if (file8 == NULL) {
792        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
793        return JNI_FALSE;
794    }
795    int fd = open(file8, O_RDONLY);
796    env->ReleaseStringUTFChars(file, file8);
797
798    if (fd < 0) {
799        //LOGW("Unable to open process file: %s\n", file8);
800        return JNI_FALSE;
801    }
802
803    char buffer[256];
804    const int len = read(fd, buffer, sizeof(buffer)-1);
805    close(fd);
806
807    if (len < 0) {
808        //LOGW("Unable to open process file: %s fd=%d\n", file8, fd);
809        return JNI_FALSE;
810    }
811    buffer[len] = 0;
812
813    return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len,
814            format, outStrings, outLongs, outFloats);
815
816}
817
818void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz,
819                                             jobject binderObject)
820{
821    if (binderObject == NULL) {
822        jniThrowNullPointerException(env, NULL);
823        return;
824    }
825
826    sp<IBinder> binder = ibinderForJavaObject(env, binderObject);
827}
828
829void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig)
830{
831    if (pid > 0) {
832        LOGI("Sending signal. PID: %d SIG: %d", pid, sig);
833        kill(pid, sig);
834    }
835}
836
837void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig)
838{
839    if (pid > 0) {
840        kill(pid, sig);
841    }
842}
843
844static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz)
845{
846    struct timespec ts;
847
848    int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
849
850    if (res != 0) {
851        return (jlong) 0;
852    }
853
854    nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
855    return (jlong) nanoseconds_to_milliseconds(when);
856}
857
858static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid)
859{
860    char filename[64];
861
862    snprintf(filename, sizeof(filename), "/proc/%d/smaps", pid);
863
864    FILE * file = fopen(filename, "r");
865    if (!file) {
866        return (jlong) -1;
867    }
868
869    // Tally up all of the Pss from the various maps
870    char line[256];
871    jlong pss = 0;
872    while (fgets(line, sizeof(line), file)) {
873        jlong v;
874        if (sscanf(line, "Pss: %lld kB", &v) == 1) {
875            pss += v;
876        }
877    }
878
879    fclose(file);
880
881    // Return the Pss value in bytes, not kilobytes
882    return pss * 1024;
883}
884
885static const JNINativeMethod methods[] = {
886    {"myPid",       "()I", (void*)android_os_Process_myPid},
887    {"myTid",       "()I", (void*)android_os_Process_myTid},
888    {"myUid",       "()I", (void*)android_os_Process_myUid},
889    {"getUidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName},
890    {"getGidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName},
891    {"setThreadPriority",   "(II)V", (void*)android_os_Process_setThreadPriority},
892    {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground},
893    {"setThreadPriority",   "(I)V", (void*)android_os_Process_setCallingThreadPriority},
894    {"getThreadPriority",   "(I)I", (void*)android_os_Process_getThreadPriority},
895    {"setThreadGroup",      "(II)V", (void*)android_os_Process_setThreadGroup},
896    {"setProcessGroup",      "(II)V", (void*)android_os_Process_setProcessGroup},
897    {"setOomAdj",   "(II)Z", (void*)android_os_Process_setOomAdj},
898    {"setArgV0",    "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0},
899    {"setUid", "(I)I", (void*)android_os_Process_setUid},
900    {"setGid", "(I)I", (void*)android_os_Process_setGid},
901    {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal},
902    {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet},
903    {"supportsProcesses", "()Z", (void*)android_os_Process_supportsProcesses},
904    {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory},
905    {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines},
906    {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids},
907    {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile},
908    {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine},
909    {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime},
910    {"getPss", "(I)J", (void*)android_os_Process_getPss},
911    //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject},
912};
913
914const char* const kProcessPathName = "android/os/Process";
915
916int register_android_os_Process(JNIEnv* env)
917{
918    jclass clazz;
919
920    clazz = env->FindClass(kProcessPathName);
921    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.Process");
922
923    return AndroidRuntime::registerNativeMethods(
924        env, kProcessPathName,
925        methods, NELEM(methods));
926}
927