android_util_Process.cpp revision 0a42b811aea490a9a605b75f0320101f6eafd283 
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
56using namespace android;
57
58static void signalExceptionForPriorityError(JNIEnv* env, jobject obj, int err)
59{
60    switch (err) {
61        case EINVAL:
62            jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
63            break;
64        case ESRCH:
65            jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist");
66            break;
67        case EPERM:
68            jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread");
69            break;
70        case EACCES:
71            jniThrowException(env, "java/lang/SecurityException", "No permission to set to given priority");
72            break;
73        default:
74            jniThrowException(env, "java/lang/RuntimeException", "Unknown error");
75            break;
76    }
77}
78
79static void signalExceptionForGroupError(JNIEnv* env, jobject obj, int err)
80{
81    switch (err) {
82        case EINVAL:
83            jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
84            break;
85        case ESRCH:
86            jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist");
87            break;
88        case EPERM:
89            jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread");
90            break;
91        case EACCES:
92            jniThrowException(env, "java/lang/SecurityException", "No permission to set to given group");
93            break;
94        default:
95            jniThrowException(env, "java/lang/RuntimeException", "Unknown error");
96            break;
97    }
98}
99
100
101static void fakeProcessEntry(void* arg)
102{
103    String8* cls = (String8*)arg;
104
105    AndroidRuntime* jr = AndroidRuntime::getRuntime();
106    jr->callMain(cls->string(), 0, NULL);
107
108    delete cls;
109}
110
111jint android_os_Process_myPid(JNIEnv* env, jobject clazz)
112{
113    return getpid();
114}
115
116jint android_os_Process_myUid(JNIEnv* env, jobject clazz)
117{
118    return getuid();
119}
120
121jint android_os_Process_myTid(JNIEnv* env, jobject clazz)
122{
123#ifdef HAVE_GETTID
124    return gettid();
125#else
126    return getpid();
127#endif
128}
129
130jint android_os_Process_getUidForName(JNIEnv* env, jobject clazz, jstring name)
131{
132    if (name == NULL) {
133        jniThrowException(env, "java/lang/NullPointerException", NULL);
134        return -1;
135    }
136
137    const jchar* str16 = env->GetStringCritical(name, 0);
138    String8 name8;
139    if (str16) {
140        name8 = String8(str16, env->GetStringLength(name));
141        env->ReleaseStringCritical(name, str16);
142    }
143
144    const size_t N = name8.size();
145    if (N > 0) {
146        const char* str = name8.string();
147        for (size_t i=0; i<N; i++) {
148            if (str[i] < '0' || str[i] > '9') {
149                struct passwd* pwd = getpwnam(str);
150                if (pwd == NULL) {
151                    return -1;
152                }
153                return pwd->pw_uid;
154            }
155        }
156        return atoi(str);
157    }
158    return -1;
159}
160
161jint android_os_Process_getGidForName(JNIEnv* env, jobject clazz, jstring name)
162{
163    if (name == NULL) {
164        jniThrowException(env, "java/lang/NullPointerException", NULL);
165        return -1;
166    }
167
168    const jchar* str16 = env->GetStringCritical(name, 0);
169    String8 name8;
170    if (str16) {
171        name8 = String8(str16, env->GetStringLength(name));
172        env->ReleaseStringCritical(name, str16);
173    }
174
175    const size_t N = name8.size();
176    if (N > 0) {
177        const char* str = name8.string();
178        for (size_t i=0; i<N; i++) {
179            if (str[i] < '0' || str[i] > '9') {
180                struct group* grp = getgrnam(str);
181                if (grp == NULL) {
182                    return -1;
183                }
184                return grp->gr_gid;
185            }
186        }
187        return atoi(str);
188    }
189    return -1;
190}
191
192void android_os_Process_setThreadGroup(JNIEnv* env, jobject clazz, int pid, jint grp)
193{
194    if (grp > ANDROID_TGROUP_MAX || grp < 0) {
195        signalExceptionForGroupError(env, clazz, EINVAL);
196        return;
197    }
198
199    if (set_sched_policy(pid, (grp == ANDROID_TGROUP_BG_NONINTERACT) ?
200                                      SP_BACKGROUND : SP_FOREGROUND)) {
201        signalExceptionForGroupError(env, clazz, errno);
202    }
203}
204
205void android_os_Process_setProcessGroup(JNIEnv* env, jobject clazz, int pid, jint grp)
206{
207    DIR *d;
208    FILE *fp;
209    char proc_path[255];
210    struct dirent *de;
211
212    if (grp > ANDROID_TGROUP_MAX || grp < 0) {
213        signalExceptionForGroupError(env, clazz, EINVAL);
214        return;
215    }
216
217#if POLICY_DEBUG
218    char cmdline[32];
219    int fd;
220
221    strcpy(cmdline, "unknown");
222
223    sprintf(proc_path, "/proc/%d/cmdline", pid);
224    fd = open(proc_path, O_RDONLY);
225    if (fd >= 0) {
226        int rc = read(fd, cmdline, sizeof(cmdline)-1);
227        cmdline[rc] = 0;
228        close(fd);
229    }
230
231    if (grp == ANDROID_TGROUP_BG_NONINTERACT) {
232        LOGD("setProcessGroup: vvv pid %d (%s)", pid, cmdline);
233    } else {
234        LOGD("setProcessGroup: ^^^ pid %d (%s)", pid, cmdline);
235    }
236#endif
237    sprintf(proc_path, "/proc/%d/task", pid);
238    if (!(d = opendir(proc_path))) {
239        // If the process exited on us, don't generate an exception
240        if (errno != ENOENT)
241            signalExceptionForGroupError(env, clazz, errno);
242        return;
243    }
244
245    while ((de = readdir(d))) {
246        int t_pid;
247        int t_pri;
248
249        if (de->d_name[0] == '.')
250            continue;
251        t_pid = atoi(de->d_name);
252
253        if (!t_pid) {
254            LOGE("Error getting pid for '%s'\n", de->d_name);
255            continue;
256        }
257
258        t_pri = getpriority(PRIO_PROCESS, t_pid);
259
260        if (grp == ANDROID_TGROUP_DEFAULT &&
261            t_pri >= ANDROID_PRIORITY_BACKGROUND) {
262            // This task wants to stay at background
263            continue;
264        }
265
266        if (set_sched_policy(t_pid, (grp == ANDROID_TGROUP_BG_NONINTERACT) ?
267                                            SP_BACKGROUND : SP_FOREGROUND)) {
268            signalExceptionForGroupError(env, clazz, errno);
269            break;
270        }
271    }
272    closedir(d);
273}
274
275void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz,
276                                              jint pid, jint pri)
277{
278    int rc = 0;
279
280    if (pri >= ANDROID_PRIORITY_BACKGROUND) {
281        rc = set_sched_policy(pid, SP_BACKGROUND);
282    } else if (getpriority(PRIO_PROCESS, pid) >= ANDROID_PRIORITY_BACKGROUND) {
283        rc = set_sched_policy(pid, SP_FOREGROUND);
284    }
285
286    if (rc) {
287        signalExceptionForGroupError(env, clazz, errno);
288    }
289
290    if (setpriority(PRIO_PROCESS, pid, pri) < 0) {
291        signalExceptionForPriorityError(env, clazz, errno);
292    }
293    //LOGI("Setting priority of %d: %d, getpriority returns %d\n",
294    //     pid, pri, getpriority(PRIO_PROCESS, pid));
295}
296
297void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz,
298                                                        jint pri)
299{
300    jint tid = android_os_Process_myTid(env, clazz);
301    android_os_Process_setThreadPriority(env, clazz, tid, pri);
302}
303
304jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz,
305                                              jint pid)
306{
307    errno = 0;
308    jint pri = getpriority(PRIO_PROCESS, pid);
309    if (errno != 0) {
310        signalExceptionForPriorityError(env, clazz, errno);
311    }
312    //LOGI("Returning priority of %d: %d\n", pid, pri);
313    return pri;
314}
315
316jboolean android_os_Process_setOomAdj(JNIEnv* env, jobject clazz,
317                                      jint pid, jint adj)
318{
319#ifdef HAVE_OOM_ADJ
320    if (ProcessState::self()->supportsProcesses()) {
321        char text[64];
322        sprintf(text, "/proc/%d/oom_adj", pid);
323        int fd = open(text, O_WRONLY);
324        if (fd >= 0) {
325            sprintf(text, "%d", adj);
326            write(fd, text, strlen(text));
327            close(fd);
328            return true;
329        }
330    }
331#endif
332    return false;
333}
334
335void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name)
336{
337    if (name == NULL) {
338        jniThrowException(env, "java/lang/NullPointerException", NULL);
339        return;
340    }
341
342    const jchar* str = env->GetStringCritical(name, 0);
343    String8 name8;
344    if (str) {
345        name8 = String8(str, env->GetStringLength(name));
346        env->ReleaseStringCritical(name, str);
347    }
348
349    if (name8.size() > 0) {
350        ProcessState::self()->setArgV0(name8.string());
351    }
352}
353
354jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid)
355{
356    #if HAVE_ANDROID_OS
357    return setuid(uid) == 0 ? 0 : errno;
358    #else
359    return ENOSYS;
360    #endif
361}
362
363jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid)
364{
365    #if HAVE_ANDROID_OS
366    return setgid(uid) == 0 ? 0 : errno;
367    #else
368    return ENOSYS;
369    #endif
370}
371
372jboolean android_os_Process_supportsProcesses(JNIEnv* env, jobject clazz)
373{
374    return ProcessState::self()->supportsProcesses();
375}
376
377static int pid_compare(const void* v1, const void* v2)
378{
379    //LOGI("Compare %d vs %d\n", *((const jint*)v1), *((const jint*)v2));
380    return *((const jint*)v1) - *((const jint*)v2);
381}
382
383static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz)
384{
385    int fd = open("/proc/meminfo", O_RDONLY);
386
387    if (fd < 0) {
388        LOGW("Unable to open /proc/meminfo");
389        return -1;
390    }
391
392    char buffer[256];
393    const int len = read(fd, buffer, sizeof(buffer)-1);
394    close(fd);
395
396    if (len < 0) {
397        LOGW("Unable to read /proc/meminfo");
398        return -1;
399    }
400    buffer[len] = 0;
401
402    int numFound = 0;
403    jlong mem = 0;
404
405    static const char* const sums[] = { "MemFree:", "Cached:", NULL };
406    static const int sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), NULL };
407
408    char* p = buffer;
409    while (*p && numFound < 2) {
410        int i = 0;
411        while (sums[i]) {
412            if (strncmp(p, sums[i], sumsLen[i]) == 0) {
413                p += sumsLen[i];
414                while (*p == ' ') p++;
415                char* num = p;
416                while (*p >= '0' && *p <= '9') p++;
417                if (*p != 0) {
418                    *p = 0;
419                    p++;
420                    if (*p == 0) p--;
421                }
422                mem += atoll(num) * 1024;
423                numFound++;
424                break;
425            }
426            i++;
427        }
428        p++;
429    }
430
431    return numFound > 0 ? mem : -1;
432}
433
434void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr,
435                                      jobjectArray reqFields, jlongArray outFields)
436{
437    //LOGI("getMemInfo: %p %p", reqFields, outFields);
438
439    if (fileStr == NULL || reqFields == NULL || outFields == NULL) {
440        jniThrowException(env, "java/lang/NullPointerException", NULL);
441        return;
442    }
443
444    const char* file8 = env->GetStringUTFChars(fileStr, NULL);
445    if (file8 == NULL) {
446        return;
447    }
448    String8 file(file8);
449    env->ReleaseStringUTFChars(fileStr, file8);
450
451    jsize count = env->GetArrayLength(reqFields);
452    if (count > env->GetArrayLength(outFields)) {
453        jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ");
454        return;
455    }
456
457    Vector<String8> fields;
458    int i;
459
460    for (i=0; i<count; i++) {
461        jobject obj = env->GetObjectArrayElement(reqFields, i);
462        if (obj != NULL) {
463            const char* str8 = env->GetStringUTFChars((jstring)obj, NULL);
464            //LOGI("String at %d: %p = %s", i, obj, str8);
465            if (str8 == NULL) {
466                jniThrowException(env, "java/lang/NullPointerException", "Element in reqFields");
467                return;
468            }
469            fields.add(String8(str8));
470            env->ReleaseStringUTFChars((jstring)obj, str8);
471        } else {
472            jniThrowException(env, "java/lang/NullPointerException", "Element in reqFields");
473            return;
474        }
475    }
476
477    jlong* sizesArray = env->GetLongArrayElements(outFields, 0);
478    if (sizesArray == NULL) {
479        return;
480    }
481
482    //LOGI("Clearing %d sizes", count);
483    for (i=0; i<count; i++) {
484        sizesArray[i] = 0;
485    }
486
487    int fd = open(file.string(), O_RDONLY);
488
489    if (fd >= 0) {
490        const size_t BUFFER_SIZE = 2048;
491        char* buffer = (char*)malloc(BUFFER_SIZE);
492        int len = read(fd, buffer, BUFFER_SIZE-1);
493        close(fd);
494
495        if (len < 0) {
496            LOGW("Unable to read %s", file.string());
497            len = 0;
498        }
499        buffer[len] = 0;
500
501        int foundCount = 0;
502
503        char* p = buffer;
504        while (*p && foundCount < count) {
505            bool skipToEol = true;
506            //LOGI("Parsing at: %s", p);
507            for (i=0; i<count; i++) {
508                const String8& field = fields[i];
509                if (strncmp(p, field.string(), field.length()) == 0) {
510                    p += field.length();
511                    while (*p == ' ' || *p == '\t') p++;
512                    char* num = p;
513                    while (*p >= '0' && *p <= '9') p++;
514                    skipToEol = *p != '\n';
515                    if (*p != 0) {
516                        *p = 0;
517                        p++;
518                    }
519                    char* end;
520                    sizesArray[i] = strtoll(num, &end, 10);
521                    //LOGI("Field %s = %d", field.string(), sizesArray[i]);
522                    foundCount++;
523                    break;
524                }
525            }
526            if (skipToEol) {
527                while (*p && *p != '\n') {
528                    p++;
529                }
530                if (*p == '\n') {
531                    p++;
532                }
533            }
534        }
535
536        free(buffer);
537    } else {
538        LOGW("Unable to open %s", file.string());
539    }
540
541    //LOGI("Done!");
542    env->ReleaseLongArrayElements(outFields, sizesArray, 0);
543}
544
545jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz,
546                                     jstring file, jintArray lastArray)
547{
548    if (file == NULL) {
549        jniThrowException(env, "java/lang/NullPointerException", NULL);
550        return NULL;
551    }
552
553    const char* file8 = env->GetStringUTFChars(file, NULL);
554    if (file8 == NULL) {
555        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
556        return NULL;
557    }
558
559    DIR* dirp = opendir(file8);
560
561    env->ReleaseStringUTFChars(file, file8);
562
563    if(dirp == NULL) {
564        return NULL;
565    }
566
567    jsize curCount = 0;
568    jint* curData = NULL;
569    if (lastArray != NULL) {
570        curCount = env->GetArrayLength(lastArray);
571        curData = env->GetIntArrayElements(lastArray, 0);
572    }
573
574    jint curPos = 0;
575
576    struct dirent* entry;
577    while ((entry=readdir(dirp)) != NULL) {
578        const char* p = entry->d_name;
579        while (*p) {
580            if (*p < '0' || *p > '9') break;
581            p++;
582        }
583        if (*p != 0) continue;
584
585        char* end;
586        int pid = strtol(entry->d_name, &end, 10);
587        //LOGI("File %s pid=%d\n", entry->d_name, pid);
588        if (curPos >= curCount) {
589            jsize newCount = (curCount == 0) ? 10 : (curCount*2);
590            jintArray newArray = env->NewIntArray(newCount);
591            if (newArray == NULL) {
592                closedir(dirp);
593                jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
594                return NULL;
595            }
596            jint* newData = env->GetIntArrayElements(newArray, 0);
597            if (curData != NULL) {
598                memcpy(newData, curData, sizeof(jint)*curCount);
599                env->ReleaseIntArrayElements(lastArray, curData, 0);
600            }
601            lastArray = newArray;
602            curCount = newCount;
603            curData = newData;
604        }
605
606        curData[curPos] = pid;
607        curPos++;
608    }
609
610    closedir(dirp);
611
612    if (curData != NULL && curPos > 0) {
613        qsort(curData, curPos, sizeof(jint), pid_compare);
614    }
615
616    while (curPos < curCount) {
617        curData[curPos] = -1;
618        curPos++;
619    }
620
621    if (curData != NULL) {
622        env->ReleaseIntArrayElements(lastArray, curData, 0);
623    }
624
625    return lastArray;
626}
627
628enum {
629    PROC_TERM_MASK = 0xff,
630    PROC_ZERO_TERM = 0,
631    PROC_SPACE_TERM = ' ',
632    PROC_COMBINE = 0x100,
633    PROC_PARENS = 0x200,
634    PROC_OUT_STRING = 0x1000,
635    PROC_OUT_LONG = 0x2000,
636    PROC_OUT_FLOAT = 0x4000,
637};
638
639jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz,
640        char* buffer, jint startIndex, jint endIndex, jintArray format,
641        jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
642{
643
644    const jsize NF = env->GetArrayLength(format);
645    const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0;
646    const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0;
647    const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0;
648
649    jint* formatData = env->GetIntArrayElements(format, 0);
650    jlong* longsData = outLongs ?
651        env->GetLongArrayElements(outLongs, 0) : NULL;
652    jfloat* floatsData = outFloats ?
653        env->GetFloatArrayElements(outFloats, 0) : NULL;
654    if (formatData == NULL || (NL > 0 && longsData == NULL)
655            || (NR > 0 && floatsData == NULL)) {
656        if (formatData != NULL) {
657            env->ReleaseIntArrayElements(format, formatData, 0);
658        }
659        if (longsData != NULL) {
660            env->ReleaseLongArrayElements(outLongs, longsData, 0);
661        }
662        if (floatsData != NULL) {
663            env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
664        }
665        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
666        return JNI_FALSE;
667    }
668
669    jsize i = startIndex;
670    jsize di = 0;
671
672    jboolean res = JNI_TRUE;
673
674    for (jsize fi=0; fi<NF; fi++) {
675        const jint mode = formatData[fi];
676        if ((mode&PROC_PARENS) != 0) {
677            i++;
678        }
679        const char term = (char)(mode&PROC_TERM_MASK);
680        const jsize start = i;
681        if (i >= endIndex) {
682            res = JNI_FALSE;
683            break;
684        }
685
686        jsize end = -1;
687        if ((mode&PROC_PARENS) != 0) {
688            while (buffer[i] != ')' && i < endIndex) {
689                i++;
690            }
691            end = i;
692            i++;
693        }
694        while (buffer[i] != term && i < endIndex) {
695            i++;
696        }
697        if (end < 0) {
698            end = i;
699        }
700
701        if (i < endIndex) {
702            i++;
703            if ((mode&PROC_COMBINE) != 0) {
704                while (buffer[i] == term && i < endIndex) {
705                    i++;
706                }
707            }
708        }
709
710        //LOGI("Field %d: %d-%d dest=%d mode=0x%x\n", i, start, end, di, mode);
711
712        if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) {
713            char c = buffer[end];
714            buffer[end] = 0;
715            if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) {
716                char* end;
717                floatsData[di] = strtof(buffer+start, &end);
718            }
719            if ((mode&PROC_OUT_LONG) != 0 && di < NL) {
720                char* end;
721                longsData[di] = strtoll(buffer+start, &end, 10);
722            }
723            if ((mode&PROC_OUT_STRING) != 0 && di < NS) {
724                jstring str = env->NewStringUTF(buffer+start);
725                env->SetObjectArrayElement(outStrings, di, str);
726            }
727            buffer[end] = c;
728            di++;
729        }
730    }
731
732    env->ReleaseIntArrayElements(format, formatData, 0);
733    if (longsData != NULL) {
734        env->ReleaseLongArrayElements(outLongs, longsData, 0);
735    }
736    if (floatsData != NULL) {
737        env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
738    }
739
740    return res;
741}
742
743jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz,
744        jbyteArray buffer, jint startIndex, jint endIndex, jintArray format,
745        jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
746{
747        jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL);
748
749        jboolean result = android_os_Process_parseProcLineArray(env, clazz,
750                (char*) bufferArray, startIndex, endIndex, format, outStrings,
751                outLongs, outFloats);
752
753        env->ReleaseByteArrayElements(buffer, bufferArray, 0);
754
755        return result;
756}
757
758jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz,
759        jstring file, jintArray format, jobjectArray outStrings,
760        jlongArray outLongs, jfloatArray outFloats)
761{
762    if (file == NULL || format == NULL) {
763        jniThrowException(env, "java/lang/NullPointerException", NULL);
764        return JNI_FALSE;
765    }
766
767    const char* file8 = env->GetStringUTFChars(file, NULL);
768    if (file8 == NULL) {
769        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
770        return JNI_FALSE;
771    }
772    int fd = open(file8, O_RDONLY);
773    env->ReleaseStringUTFChars(file, file8);
774
775    if (fd < 0) {
776        //LOGW("Unable to open process file: %s\n", file8);
777        return JNI_FALSE;
778    }
779
780    char buffer[256];
781    const int len = read(fd, buffer, sizeof(buffer)-1);
782    close(fd);
783
784    if (len < 0) {
785        //LOGW("Unable to open process file: %s fd=%d\n", file8, fd);
786        return JNI_FALSE;
787    }
788    buffer[len] = 0;
789
790    return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len,
791            format, outStrings, outLongs, outFloats);
792
793}
794
795void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz,
796                                             jobject binderObject)
797{
798    if (binderObject == NULL) {
799        jniThrowException(env, "java/lang/NullPointerException", NULL);
800        return;
801    }
802
803    sp<IBinder> binder = ibinderForJavaObject(env, binderObject);
804}
805
806void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig)
807{
808    if (pid > 0) {
809        LOGI("Sending signal. PID: %d SIG: %d", pid, sig);
810        kill(pid, sig);
811    }
812}
813
814static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz)
815{
816    struct timespec ts;
817
818    int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
819
820    if (res != 0) {
821        return (jlong) 0;
822    }
823
824    nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
825    return (jlong) nanoseconds_to_milliseconds(when);
826}
827
828static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid)
829{
830    char filename[64];
831
832    snprintf(filename, sizeof(filename), "/proc/%d/smaps", pid);
833
834    FILE * file = fopen(filename, "r");
835    if (!file) {
836        return (jlong) -1;
837    }
838
839    // Tally up all of the Pss from the various maps
840    char line[256];
841    jlong pss = 0;
842    while (fgets(line, sizeof(line), file)) {
843        jlong v;
844        if (sscanf(line, "Pss: %lld kB", &v) == 1) {
845            pss += v;
846        }
847    }
848
849    fclose(file);
850
851    // Return the Pss value in bytes, not kilobytes
852    return pss * 1024;
853}
854
855static const JNINativeMethod methods[] = {
856    {"myPid",       "()I", (void*)android_os_Process_myPid},
857    {"myTid",       "()I", (void*)android_os_Process_myTid},
858    {"myUid",       "()I", (void*)android_os_Process_myUid},
859    {"getUidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName},
860    {"getGidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName},
861    {"setThreadPriority",   "(II)V", (void*)android_os_Process_setThreadPriority},
862    {"setThreadPriority",   "(I)V", (void*)android_os_Process_setCallingThreadPriority},
863    {"getThreadPriority",   "(I)I", (void*)android_os_Process_getThreadPriority},
864    {"setThreadGroup",      "(II)V", (void*)android_os_Process_setThreadGroup},
865    {"setProcessGroup",      "(II)V", (void*)android_os_Process_setProcessGroup},
866    {"setOomAdj",   "(II)Z", (void*)android_os_Process_setOomAdj},
867    {"setArgV0",    "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0},
868    {"setUid", "(I)I", (void*)android_os_Process_setUid},
869    {"setGid", "(I)I", (void*)android_os_Process_setGid},
870    {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal},
871    {"supportsProcesses", "()Z", (void*)android_os_Process_supportsProcesses},
872    {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory},
873    {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines},
874    {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids},
875    {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile},
876    {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine},
877    {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime},
878    {"getPss", "(I)J", (void*)android_os_Process_getPss},
879    //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject},
880};
881
882const char* const kProcessPathName = "android/os/Process";
883
884int register_android_os_Process(JNIEnv* env)
885{
886    jclass clazz;
887
888    clazz = env->FindClass(kProcessPathName);
889    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.Process");
890
891    return AndroidRuntime::registerNativeMethods(
892        env, kProcessPathName,
893        methods, NELEM(methods));
894}
895