android_util_Process.cpp revision 160edb3645f8b7012bab70ae6e6e8c4a5733082b 
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        jniThrowException(env, "java/lang/NullPointerException", 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        jniThrowException(env, "java/lang/NullPointerException", 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 (set_sched_policy(t_pid, (grp == ANDROID_TGROUP_BG_NONINTERACT) ?
265                                            SP_BACKGROUND : SP_FOREGROUND)) {
266            signalExceptionForGroupError(env, clazz, errno);
267            break;
268        }
269    }
270    closedir(d);
271}
272
273static void android_os_Process_setCanSelfBackground(JNIEnv* env, jobject clazz, jboolean bgOk) {
274    // Establishes the calling thread as illegal to put into the background.
275    // Typically used only for the system process's main looper.
276#if GUARD_THREAD_PRIORITY
277    LOGV("Process.setCanSelfBackground(%d) : tid=%d", bgOk, androidGetTid());
278    {
279        Mutex::Autolock _l(gKeyCreateMutex);
280        if (gBgKey == -1) {
281            pthread_key_create(&gBgKey, NULL);
282        }
283    }
284
285    // inverted:  not-okay, we set a sentinel value
286    pthread_setspecific(gBgKey, (void*)(bgOk ? 0 : 0xbaad));
287#endif
288}
289
290void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz,
291                                              jint pid, jint pri)
292{
293#if GUARD_THREAD_PRIORITY
294    // if we're putting the current thread into the background, check the TLS
295    // to make sure this thread isn't guarded.  If it is, raise an exception.
296    if (pri >= ANDROID_PRIORITY_BACKGROUND) {
297        if (pid == androidGetTid()) {
298            void* bgOk = pthread_getspecific(gBgKey);
299            if (bgOk == ((void*)0xbaad)) {
300                LOGE("Thread marked fg-only put self in background!");
301                jniThrowException(env, "java/lang/SecurityException", "May not put this thread into background");
302                return;
303            }
304        }
305    }
306#endif
307
308    int rc = androidSetThreadPriority(pid, pri);
309    if (rc != 0) {
310        if (rc == INVALID_OPERATION) {
311            signalExceptionForPriorityError(env, clazz, errno);
312        } else {
313            signalExceptionForGroupError(env, clazz, errno);
314        }
315    }
316
317    //LOGI("Setting priority of %d: %d, getpriority returns %d\n",
318    //     pid, pri, getpriority(PRIO_PROCESS, pid));
319}
320
321void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz,
322                                                        jint pri)
323{
324    jint tid = android_os_Process_myTid(env, clazz);
325    android_os_Process_setThreadPriority(env, clazz, tid, pri);
326}
327
328jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz,
329                                              jint pid)
330{
331    errno = 0;
332    jint pri = getpriority(PRIO_PROCESS, pid);
333    if (errno != 0) {
334        signalExceptionForPriorityError(env, clazz, errno);
335    }
336    //LOGI("Returning priority of %d: %d\n", pid, pri);
337    return pri;
338}
339
340jboolean android_os_Process_setOomAdj(JNIEnv* env, jobject clazz,
341                                      jint pid, jint adj)
342{
343#ifdef HAVE_OOM_ADJ
344    if (ProcessState::self()->supportsProcesses()) {
345        char text[64];
346        sprintf(text, "/proc/%d/oom_adj", pid);
347        int fd = open(text, O_WRONLY);
348        if (fd >= 0) {
349            sprintf(text, "%d", adj);
350            write(fd, text, strlen(text));
351            close(fd);
352        }
353        return true;
354    }
355#endif
356    return false;
357}
358
359void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name)
360{
361    if (name == NULL) {
362        jniThrowException(env, "java/lang/NullPointerException", NULL);
363        return;
364    }
365
366    const jchar* str = env->GetStringCritical(name, 0);
367    String8 name8;
368    if (str) {
369        name8 = String8(str, env->GetStringLength(name));
370        env->ReleaseStringCritical(name, str);
371    }
372
373    if (name8.size() > 0) {
374        ProcessState::self()->setArgV0(name8.string());
375    }
376}
377
378jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid)
379{
380    #if HAVE_ANDROID_OS
381    return setuid(uid) == 0 ? 0 : errno;
382    #else
383    return ENOSYS;
384    #endif
385}
386
387jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid)
388{
389    #if HAVE_ANDROID_OS
390    return setgid(uid) == 0 ? 0 : errno;
391    #else
392    return ENOSYS;
393    #endif
394}
395
396jboolean android_os_Process_supportsProcesses(JNIEnv* env, jobject clazz)
397{
398    return ProcessState::self()->supportsProcesses();
399}
400
401static int pid_compare(const void* v1, const void* v2)
402{
403    //LOGI("Compare %d vs %d\n", *((const jint*)v1), *((const jint*)v2));
404    return *((const jint*)v1) - *((const jint*)v2);
405}
406
407static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz)
408{
409    int fd = open("/proc/meminfo", O_RDONLY);
410
411    if (fd < 0) {
412        LOGW("Unable to open /proc/meminfo");
413        return -1;
414    }
415
416    char buffer[256];
417    const int len = read(fd, buffer, sizeof(buffer)-1);
418    close(fd);
419
420    if (len < 0) {
421        LOGW("Unable to read /proc/meminfo");
422        return -1;
423    }
424    buffer[len] = 0;
425
426    int numFound = 0;
427    jlong mem = 0;
428
429    static const char* const sums[] = { "MemFree:", "Cached:", NULL };
430    static const int sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), NULL };
431
432    char* p = buffer;
433    while (*p && numFound < 2) {
434        int i = 0;
435        while (sums[i]) {
436            if (strncmp(p, sums[i], sumsLen[i]) == 0) {
437                p += sumsLen[i];
438                while (*p == ' ') p++;
439                char* num = p;
440                while (*p >= '0' && *p <= '9') p++;
441                if (*p != 0) {
442                    *p = 0;
443                    p++;
444                    if (*p == 0) p--;
445                }
446                mem += atoll(num) * 1024;
447                numFound++;
448                break;
449            }
450            i++;
451        }
452        p++;
453    }
454
455    return numFound > 0 ? mem : -1;
456}
457
458void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr,
459                                      jobjectArray reqFields, jlongArray outFields)
460{
461    //LOGI("getMemInfo: %p %p", reqFields, outFields);
462
463    if (fileStr == NULL || reqFields == NULL || outFields == NULL) {
464        jniThrowException(env, "java/lang/NullPointerException", NULL);
465        return;
466    }
467
468    const char* file8 = env->GetStringUTFChars(fileStr, NULL);
469    if (file8 == NULL) {
470        return;
471    }
472    String8 file(file8);
473    env->ReleaseStringUTFChars(fileStr, file8);
474
475    jsize count = env->GetArrayLength(reqFields);
476    if (count > env->GetArrayLength(outFields)) {
477        jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ");
478        return;
479    }
480
481    Vector<String8> fields;
482    int i;
483
484    for (i=0; i<count; i++) {
485        jobject obj = env->GetObjectArrayElement(reqFields, i);
486        if (obj != NULL) {
487            const char* str8 = env->GetStringUTFChars((jstring)obj, NULL);
488            //LOGI("String at %d: %p = %s", i, obj, str8);
489            if (str8 == NULL) {
490                jniThrowException(env, "java/lang/NullPointerException", "Element in reqFields");
491                return;
492            }
493            fields.add(String8(str8));
494            env->ReleaseStringUTFChars((jstring)obj, str8);
495        } else {
496            jniThrowException(env, "java/lang/NullPointerException", "Element in reqFields");
497            return;
498        }
499    }
500
501    jlong* sizesArray = env->GetLongArrayElements(outFields, 0);
502    if (sizesArray == NULL) {
503        return;
504    }
505
506    //LOGI("Clearing %d sizes", count);
507    for (i=0; i<count; i++) {
508        sizesArray[i] = 0;
509    }
510
511    int fd = open(file.string(), O_RDONLY);
512
513    if (fd >= 0) {
514        const size_t BUFFER_SIZE = 2048;
515        char* buffer = (char*)malloc(BUFFER_SIZE);
516        int len = read(fd, buffer, BUFFER_SIZE-1);
517        close(fd);
518
519        if (len < 0) {
520            LOGW("Unable to read %s", file.string());
521            len = 0;
522        }
523        buffer[len] = 0;
524
525        int foundCount = 0;
526
527        char* p = buffer;
528        while (*p && foundCount < count) {
529            bool skipToEol = true;
530            //LOGI("Parsing at: %s", p);
531            for (i=0; i<count; i++) {
532                const String8& field = fields[i];
533                if (strncmp(p, field.string(), field.length()) == 0) {
534                    p += field.length();
535                    while (*p == ' ' || *p == '\t') p++;
536                    char* num = p;
537                    while (*p >= '0' && *p <= '9') p++;
538                    skipToEol = *p != '\n';
539                    if (*p != 0) {
540                        *p = 0;
541                        p++;
542                    }
543                    char* end;
544                    sizesArray[i] = strtoll(num, &end, 10);
545                    //LOGI("Field %s = %d", field.string(), sizesArray[i]);
546                    foundCount++;
547                    break;
548                }
549            }
550            if (skipToEol) {
551                while (*p && *p != '\n') {
552                    p++;
553                }
554                if (*p == '\n') {
555                    p++;
556                }
557            }
558        }
559
560        free(buffer);
561    } else {
562        LOGW("Unable to open %s", file.string());
563    }
564
565    //LOGI("Done!");
566    env->ReleaseLongArrayElements(outFields, sizesArray, 0);
567}
568
569jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz,
570                                     jstring file, jintArray lastArray)
571{
572    if (file == NULL) {
573        jniThrowException(env, "java/lang/NullPointerException", NULL);
574        return NULL;
575    }
576
577    const char* file8 = env->GetStringUTFChars(file, NULL);
578    if (file8 == NULL) {
579        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
580        return NULL;
581    }
582
583    DIR* dirp = opendir(file8);
584
585    env->ReleaseStringUTFChars(file, file8);
586
587    if(dirp == NULL) {
588        return NULL;
589    }
590
591    jsize curCount = 0;
592    jint* curData = NULL;
593    if (lastArray != NULL) {
594        curCount = env->GetArrayLength(lastArray);
595        curData = env->GetIntArrayElements(lastArray, 0);
596    }
597
598    jint curPos = 0;
599
600    struct dirent* entry;
601    while ((entry=readdir(dirp)) != NULL) {
602        const char* p = entry->d_name;
603        while (*p) {
604            if (*p < '0' || *p > '9') break;
605            p++;
606        }
607        if (*p != 0) continue;
608
609        char* end;
610        int pid = strtol(entry->d_name, &end, 10);
611        //LOGI("File %s pid=%d\n", entry->d_name, pid);
612        if (curPos >= curCount) {
613            jsize newCount = (curCount == 0) ? 10 : (curCount*2);
614            jintArray newArray = env->NewIntArray(newCount);
615            if (newArray == NULL) {
616                closedir(dirp);
617                jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
618                return NULL;
619            }
620            jint* newData = env->GetIntArrayElements(newArray, 0);
621            if (curData != NULL) {
622                memcpy(newData, curData, sizeof(jint)*curCount);
623                env->ReleaseIntArrayElements(lastArray, curData, 0);
624            }
625            lastArray = newArray;
626            curCount = newCount;
627            curData = newData;
628        }
629
630        curData[curPos] = pid;
631        curPos++;
632    }
633
634    closedir(dirp);
635
636    if (curData != NULL && curPos > 0) {
637        qsort(curData, curPos, sizeof(jint), pid_compare);
638    }
639
640    while (curPos < curCount) {
641        curData[curPos] = -1;
642        curPos++;
643    }
644
645    if (curData != NULL) {
646        env->ReleaseIntArrayElements(lastArray, curData, 0);
647    }
648
649    return lastArray;
650}
651
652enum {
653    PROC_TERM_MASK = 0xff,
654    PROC_ZERO_TERM = 0,
655    PROC_SPACE_TERM = ' ',
656    PROC_COMBINE = 0x100,
657    PROC_PARENS = 0x200,
658    PROC_OUT_STRING = 0x1000,
659    PROC_OUT_LONG = 0x2000,
660    PROC_OUT_FLOAT = 0x4000,
661};
662
663jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz,
664        char* buffer, jint startIndex, jint endIndex, jintArray format,
665        jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
666{
667
668    const jsize NF = env->GetArrayLength(format);
669    const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0;
670    const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0;
671    const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0;
672
673    jint* formatData = env->GetIntArrayElements(format, 0);
674    jlong* longsData = outLongs ?
675        env->GetLongArrayElements(outLongs, 0) : NULL;
676    jfloat* floatsData = outFloats ?
677        env->GetFloatArrayElements(outFloats, 0) : NULL;
678    if (formatData == NULL || (NL > 0 && longsData == NULL)
679            || (NR > 0 && floatsData == NULL)) {
680        if (formatData != NULL) {
681            env->ReleaseIntArrayElements(format, formatData, 0);
682        }
683        if (longsData != NULL) {
684            env->ReleaseLongArrayElements(outLongs, longsData, 0);
685        }
686        if (floatsData != NULL) {
687            env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
688        }
689        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
690        return JNI_FALSE;
691    }
692
693    jsize i = startIndex;
694    jsize di = 0;
695
696    jboolean res = JNI_TRUE;
697
698    for (jsize fi=0; fi<NF; fi++) {
699        const jint mode = formatData[fi];
700        if ((mode&PROC_PARENS) != 0) {
701            i++;
702        }
703        const char term = (char)(mode&PROC_TERM_MASK);
704        const jsize start = i;
705        if (i >= endIndex) {
706            res = JNI_FALSE;
707            break;
708        }
709
710        jsize end = -1;
711        if ((mode&PROC_PARENS) != 0) {
712            while (buffer[i] != ')' && i < endIndex) {
713                i++;
714            }
715            end = i;
716            i++;
717        }
718        while (buffer[i] != term && i < endIndex) {
719            i++;
720        }
721        if (end < 0) {
722            end = i;
723        }
724
725        if (i < endIndex) {
726            i++;
727            if ((mode&PROC_COMBINE) != 0) {
728                while (buffer[i] == term && i < endIndex) {
729                    i++;
730                }
731            }
732        }
733
734        //LOGI("Field %d: %d-%d dest=%d mode=0x%x\n", i, start, end, di, mode);
735
736        if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) {
737            char c = buffer[end];
738            buffer[end] = 0;
739            if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) {
740                char* end;
741                floatsData[di] = strtof(buffer+start, &end);
742            }
743            if ((mode&PROC_OUT_LONG) != 0 && di < NL) {
744                char* end;
745                longsData[di] = strtoll(buffer+start, &end, 10);
746            }
747            if ((mode&PROC_OUT_STRING) != 0 && di < NS) {
748                jstring str = env->NewStringUTF(buffer+start);
749                env->SetObjectArrayElement(outStrings, di, str);
750            }
751            buffer[end] = c;
752            di++;
753        }
754    }
755
756    env->ReleaseIntArrayElements(format, formatData, 0);
757    if (longsData != NULL) {
758        env->ReleaseLongArrayElements(outLongs, longsData, 0);
759    }
760    if (floatsData != NULL) {
761        env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
762    }
763
764    return res;
765}
766
767jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz,
768        jbyteArray buffer, jint startIndex, jint endIndex, jintArray format,
769        jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
770{
771        jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL);
772
773        jboolean result = android_os_Process_parseProcLineArray(env, clazz,
774                (char*) bufferArray, startIndex, endIndex, format, outStrings,
775                outLongs, outFloats);
776
777        env->ReleaseByteArrayElements(buffer, bufferArray, 0);
778
779        return result;
780}
781
782jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz,
783        jstring file, jintArray format, jobjectArray outStrings,
784        jlongArray outLongs, jfloatArray outFloats)
785{
786    if (file == NULL || format == NULL) {
787        jniThrowException(env, "java/lang/NullPointerException", NULL);
788        return JNI_FALSE;
789    }
790
791    const char* file8 = env->GetStringUTFChars(file, NULL);
792    if (file8 == NULL) {
793        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
794        return JNI_FALSE;
795    }
796    int fd = open(file8, O_RDONLY);
797    env->ReleaseStringUTFChars(file, file8);
798
799    if (fd < 0) {
800        //LOGW("Unable to open process file: %s\n", file8);
801        return JNI_FALSE;
802    }
803
804    char buffer[256];
805    const int len = read(fd, buffer, sizeof(buffer)-1);
806    close(fd);
807
808    if (len < 0) {
809        //LOGW("Unable to open process file: %s fd=%d\n", file8, fd);
810        return JNI_FALSE;
811    }
812    buffer[len] = 0;
813
814    return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len,
815            format, outStrings, outLongs, outFloats);
816
817}
818
819void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz,
820                                             jobject binderObject)
821{
822    if (binderObject == NULL) {
823        jniThrowException(env, "java/lang/NullPointerException", NULL);
824        return;
825    }
826
827    sp<IBinder> binder = ibinderForJavaObject(env, binderObject);
828}
829
830void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig)
831{
832    if (pid > 0) {
833        LOGI("Sending signal. PID: %d SIG: %d", pid, sig);
834        kill(pid, sig);
835    }
836}
837
838void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig)
839{
840    if (pid > 0) {
841        kill(pid, sig);
842    }
843}
844
845static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz)
846{
847    struct timespec ts;
848
849    int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
850
851    if (res != 0) {
852        return (jlong) 0;
853    }
854
855    nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
856    return (jlong) nanoseconds_to_milliseconds(when);
857}
858
859static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid)
860{
861    char filename[64];
862
863    snprintf(filename, sizeof(filename), "/proc/%d/smaps", pid);
864
865    FILE * file = fopen(filename, "r");
866    if (!file) {
867        return (jlong) -1;
868    }
869
870    // Tally up all of the Pss from the various maps
871    char line[256];
872    jlong pss = 0;
873    while (fgets(line, sizeof(line), file)) {
874        jlong v;
875        if (sscanf(line, "Pss: %lld kB", &v) == 1) {
876            pss += v;
877        }
878    }
879
880    fclose(file);
881
882    // Return the Pss value in bytes, not kilobytes
883    return pss * 1024;
884}
885
886static const JNINativeMethod methods[] = {
887    {"myPid",       "()I", (void*)android_os_Process_myPid},
888    {"myTid",       "()I", (void*)android_os_Process_myTid},
889    {"myUid",       "()I", (void*)android_os_Process_myUid},
890    {"getUidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName},
891    {"getGidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName},
892    {"setThreadPriority",   "(II)V", (void*)android_os_Process_setThreadPriority},
893    {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground},
894    {"setThreadPriority",   "(I)V", (void*)android_os_Process_setCallingThreadPriority},
895    {"getThreadPriority",   "(I)I", (void*)android_os_Process_getThreadPriority},
896    {"setThreadGroup",      "(II)V", (void*)android_os_Process_setThreadGroup},
897    {"setProcessGroup",      "(II)V", (void*)android_os_Process_setProcessGroup},
898    {"setOomAdj",   "(II)Z", (void*)android_os_Process_setOomAdj},
899    {"setArgV0",    "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0},
900    {"setUid", "(I)I", (void*)android_os_Process_setUid},
901    {"setGid", "(I)I", (void*)android_os_Process_setGid},
902    {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal},
903    {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet},
904    {"supportsProcesses", "()Z", (void*)android_os_Process_supportsProcesses},
905    {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory},
906    {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines},
907    {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids},
908    {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile},
909    {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine},
910    {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime},
911    {"getPss", "(I)J", (void*)android_os_Process_getPss},
912    //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject},
913};
914
915const char* const kProcessPathName = "android/os/Process";
916
917int register_android_os_Process(JNIEnv* env)
918{
919    jclass clazz;
920
921    clazz = env->FindClass(kProcessPathName);
922    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.Process");
923
924    return AndroidRuntime::registerNativeMethods(
925        env, kProcessPathName,
926        methods, NELEM(methods));
927}
928