android_util_Process.cpp revision 957e58670baad8c5995f1368e3b5280f0dbd891f 
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        }
270    }
271    closedir(d);
272}
273
274void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz,
275                                              jint pid, jint pri)
276{
277    int rc = 0;
278
279    if (pri >= ANDROID_PRIORITY_BACKGROUND) {
280        rc = set_sched_policy(pid, SP_BACKGROUND);
281    } else if (getpriority(PRIO_PROCESS, pid) >= ANDROID_PRIORITY_BACKGROUND) {
282        rc = set_sched_policy(pid, SP_FOREGROUND);
283    }
284
285    if (rc) {
286        signalExceptionForGroupError(env, clazz, errno);
287    }
288
289    if (setpriority(PRIO_PROCESS, pid, pri) < 0) {
290        signalExceptionForPriorityError(env, clazz, errno);
291    }
292    //LOGI("Setting priority of %d: %d, getpriority returns %d\n",
293    //     pid, pri, getpriority(PRIO_PROCESS, pid));
294}
295
296void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz,
297                                                        jint pri)
298{
299    jint tid = android_os_Process_myTid(env, clazz);
300    android_os_Process_setThreadPriority(env, clazz, tid, pri);
301}
302
303jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz,
304                                              jint pid)
305{
306    errno = 0;
307    jint pri = getpriority(PRIO_PROCESS, pid);
308    if (errno != 0) {
309        signalExceptionForPriorityError(env, clazz, errno);
310    }
311    //LOGI("Returning priority of %d: %d\n", pid, pri);
312    return pri;
313}
314
315jboolean android_os_Process_setOomAdj(JNIEnv* env, jobject clazz,
316                                      jint pid, jint adj)
317{
318#ifdef HAVE_OOM_ADJ
319    if (ProcessState::self()->supportsProcesses()) {
320        char text[64];
321        sprintf(text, "/proc/%d/oom_adj", pid);
322        int fd = open(text, O_WRONLY);
323        if (fd >= 0) {
324            sprintf(text, "%d", adj);
325            write(fd, text, strlen(text));
326            close(fd);
327            return true;
328        }
329    }
330#endif
331    return false;
332}
333
334void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name)
335{
336    if (name == NULL) {
337        jniThrowException(env, "java/lang/NullPointerException", NULL);
338        return;
339    }
340
341    const jchar* str = env->GetStringCritical(name, 0);
342    String8 name8;
343    if (str) {
344        name8 = String8(str, env->GetStringLength(name));
345        env->ReleaseStringCritical(name, str);
346    }
347
348    if (name8.size() > 0) {
349        ProcessState::self()->setArgV0(name8.string());
350    }
351}
352
353jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid)
354{
355    #if HAVE_ANDROID_OS
356    return setuid(uid) == 0 ? 0 : errno;
357    #else
358    return ENOSYS;
359    #endif
360}
361
362jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid)
363{
364    #if HAVE_ANDROID_OS
365    return setgid(uid) == 0 ? 0 : errno;
366    #else
367    return ENOSYS;
368    #endif
369}
370
371jboolean android_os_Process_supportsProcesses(JNIEnv* env, jobject clazz)
372{
373    return ProcessState::self()->supportsProcesses();
374}
375
376static int pid_compare(const void* v1, const void* v2)
377{
378    //LOGI("Compare %d vs %d\n", *((const jint*)v1), *((const jint*)v2));
379    return *((const jint*)v1) - *((const jint*)v2);
380}
381
382static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz)
383{
384    int fd = open("/proc/meminfo", O_RDONLY);
385
386    if (fd < 0) {
387        LOGW("Unable to open /proc/meminfo");
388        return -1;
389    }
390
391    char buffer[256];
392    const int len = read(fd, buffer, sizeof(buffer)-1);
393    close(fd);
394
395    if (len < 0) {
396        LOGW("Unable to read /proc/meminfo");
397        return -1;
398    }
399    buffer[len] = 0;
400
401    int numFound = 0;
402    jlong mem = 0;
403
404    static const char* const sums[] = { "MemFree:", "Cached:", NULL };
405    static const int sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), NULL };
406
407    char* p = buffer;
408    while (*p && numFound < 2) {
409        int i = 0;
410        while (sums[i]) {
411            if (strncmp(p, sums[i], sumsLen[i]) == 0) {
412                p += sumsLen[i];
413                while (*p == ' ') p++;
414                char* num = p;
415                while (*p >= '0' && *p <= '9') p++;
416                if (*p != 0) {
417                    *p = 0;
418                    p++;
419                    if (*p == 0) p--;
420                }
421                mem += atoll(num) * 1024;
422                numFound++;
423                break;
424            }
425            i++;
426        }
427        p++;
428    }
429
430    return numFound > 0 ? mem : -1;
431}
432
433void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr,
434                                      jobjectArray reqFields, jlongArray outFields)
435{
436    //LOGI("getMemInfo: %p %p", reqFields, outFields);
437
438    if (fileStr == NULL || reqFields == NULL || outFields == NULL) {
439        jniThrowException(env, "java/lang/NullPointerException", NULL);
440        return;
441    }
442
443    const char* file8 = env->GetStringUTFChars(fileStr, NULL);
444    if (file8 == NULL) {
445        return;
446    }
447    String8 file(file8);
448    env->ReleaseStringUTFChars(fileStr, file8);
449
450    jsize count = env->GetArrayLength(reqFields);
451    if (count > env->GetArrayLength(outFields)) {
452        jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ");
453        return;
454    }
455
456    Vector<String8> fields;
457    int i;
458
459    for (i=0; i<count; i++) {
460        jobject obj = env->GetObjectArrayElement(reqFields, i);
461        if (obj != NULL) {
462            const char* str8 = env->GetStringUTFChars((jstring)obj, NULL);
463            //LOGI("String at %d: %p = %s", i, obj, str8);
464            if (str8 == NULL) {
465                jniThrowException(env, "java/lang/NullPointerException", "Element in reqFields");
466                return;
467            }
468            fields.add(String8(str8));
469            env->ReleaseStringUTFChars((jstring)obj, str8);
470        } else {
471            jniThrowException(env, "java/lang/NullPointerException", "Element in reqFields");
472            return;
473        }
474    }
475
476    jlong* sizesArray = env->GetLongArrayElements(outFields, 0);
477    if (sizesArray == NULL) {
478        return;
479    }
480
481    //LOGI("Clearing %d sizes", count);
482    for (i=0; i<count; i++) {
483        sizesArray[i] = 0;
484    }
485
486    int fd = open(file.string(), O_RDONLY);
487
488    if (fd >= 0) {
489        const size_t BUFFER_SIZE = 2048;
490        char* buffer = (char*)malloc(BUFFER_SIZE);
491        int len = read(fd, buffer, BUFFER_SIZE-1);
492        close(fd);
493
494        if (len < 0) {
495            LOGW("Unable to read %s", file.string());
496            len = 0;
497        }
498        buffer[len] = 0;
499
500        int foundCount = 0;
501
502        char* p = buffer;
503        while (*p && foundCount < count) {
504            bool skipToEol = true;
505            //LOGI("Parsing at: %s", p);
506            for (i=0; i<count; i++) {
507                const String8& field = fields[i];
508                if (strncmp(p, field.string(), field.length()) == 0) {
509                    p += field.length();
510                    while (*p == ' ' || *p == '\t') p++;
511                    char* num = p;
512                    while (*p >= '0' && *p <= '9') p++;
513                    skipToEol = *p != '\n';
514                    if (*p != 0) {
515                        *p = 0;
516                        p++;
517                    }
518                    char* end;
519                    sizesArray[i] = strtoll(num, &end, 10);
520                    //LOGI("Field %s = %d", field.string(), sizesArray[i]);
521                    foundCount++;
522                    break;
523                }
524            }
525            if (skipToEol) {
526                while (*p && *p != '\n') {
527                    p++;
528                }
529                if (*p == '\n') {
530                    p++;
531                }
532            }
533        }
534
535        free(buffer);
536    } else {
537        LOGW("Unable to open %s", file.string());
538    }
539
540    //LOGI("Done!");
541    env->ReleaseLongArrayElements(outFields, sizesArray, 0);
542}
543
544jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz,
545                                     jstring file, jintArray lastArray)
546{
547    if (file == NULL) {
548        jniThrowException(env, "java/lang/NullPointerException", NULL);
549        return NULL;
550    }
551
552    const char* file8 = env->GetStringUTFChars(file, NULL);
553    if (file8 == NULL) {
554        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
555        return NULL;
556    }
557
558    DIR* dirp = opendir(file8);
559
560    env->ReleaseStringUTFChars(file, file8);
561
562    if(dirp == NULL) {
563        return NULL;
564    }
565
566    jsize curCount = 0;
567    jint* curData = NULL;
568    if (lastArray != NULL) {
569        curCount = env->GetArrayLength(lastArray);
570        curData = env->GetIntArrayElements(lastArray, 0);
571    }
572
573    jint curPos = 0;
574
575    struct dirent* entry;
576    while ((entry=readdir(dirp)) != NULL) {
577        const char* p = entry->d_name;
578        while (*p) {
579            if (*p < '0' || *p > '9') break;
580            p++;
581        }
582        if (*p != 0) continue;
583
584        char* end;
585        int pid = strtol(entry->d_name, &end, 10);
586        //LOGI("File %s pid=%d\n", entry->d_name, pid);
587        if (curPos >= curCount) {
588            jsize newCount = (curCount == 0) ? 10 : (curCount*2);
589            jintArray newArray = env->NewIntArray(newCount);
590            if (newArray == NULL) {
591                closedir(dirp);
592                jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
593                return NULL;
594            }
595            jint* newData = env->GetIntArrayElements(newArray, 0);
596            if (curData != NULL) {
597                memcpy(newData, curData, sizeof(jint)*curCount);
598                env->ReleaseIntArrayElements(lastArray, curData, 0);
599            }
600            lastArray = newArray;
601            curCount = newCount;
602            curData = newData;
603        }
604
605        curData[curPos] = pid;
606        curPos++;
607    }
608
609    closedir(dirp);
610
611    if (curData != NULL && curPos > 0) {
612        qsort(curData, curPos, sizeof(jint), pid_compare);
613    }
614
615    while (curPos < curCount) {
616        curData[curPos] = -1;
617        curPos++;
618    }
619
620    if (curData != NULL) {
621        env->ReleaseIntArrayElements(lastArray, curData, 0);
622    }
623
624    return lastArray;
625}
626
627enum {
628    PROC_TERM_MASK = 0xff,
629    PROC_ZERO_TERM = 0,
630    PROC_SPACE_TERM = ' ',
631    PROC_COMBINE = 0x100,
632    PROC_PARENS = 0x200,
633    PROC_OUT_STRING = 0x1000,
634    PROC_OUT_LONG = 0x2000,
635    PROC_OUT_FLOAT = 0x4000,
636};
637
638jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz,
639        char* buffer, jint startIndex, jint endIndex, jintArray format,
640        jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
641{
642
643    const jsize NF = env->GetArrayLength(format);
644    const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0;
645    const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0;
646    const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0;
647
648    jint* formatData = env->GetIntArrayElements(format, 0);
649    jlong* longsData = outLongs ?
650        env->GetLongArrayElements(outLongs, 0) : NULL;
651    jfloat* floatsData = outFloats ?
652        env->GetFloatArrayElements(outFloats, 0) : NULL;
653    if (formatData == NULL || (NL > 0 && longsData == NULL)
654            || (NR > 0 && floatsData == NULL)) {
655        if (formatData != NULL) {
656            env->ReleaseIntArrayElements(format, formatData, 0);
657        }
658        if (longsData != NULL) {
659            env->ReleaseLongArrayElements(outLongs, longsData, 0);
660        }
661        if (floatsData != NULL) {
662            env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
663        }
664        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
665        return JNI_FALSE;
666    }
667
668    jsize i = startIndex;
669    jsize di = 0;
670
671    jboolean res = JNI_TRUE;
672
673    for (jsize fi=0; fi<NF; fi++) {
674        const jint mode = formatData[fi];
675        if ((mode&PROC_PARENS) != 0) {
676            i++;
677        }
678        const char term = (char)(mode&PROC_TERM_MASK);
679        const jsize start = i;
680        if (i >= endIndex) {
681            res = JNI_FALSE;
682            break;
683        }
684
685        jsize end = -1;
686        if ((mode&PROC_PARENS) != 0) {
687            while (buffer[i] != ')' && i < endIndex) {
688                i++;
689            }
690            end = i;
691            i++;
692        }
693        while (buffer[i] != term && i < endIndex) {
694            i++;
695        }
696        if (end < 0) {
697            end = i;
698        }
699
700        if (i < endIndex) {
701            i++;
702            if ((mode&PROC_COMBINE) != 0) {
703                while (buffer[i] == term && i < endIndex) {
704                    i++;
705                }
706            }
707        }
708
709        //LOGI("Field %d: %d-%d dest=%d mode=0x%x\n", i, start, end, di, mode);
710
711        if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) {
712            char c = buffer[end];
713            buffer[end] = 0;
714            if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) {
715                char* end;
716                floatsData[di] = strtof(buffer+start, &end);
717            }
718            if ((mode&PROC_OUT_LONG) != 0 && di < NL) {
719                char* end;
720                longsData[di] = strtoll(buffer+start, &end, 10);
721            }
722            if ((mode&PROC_OUT_STRING) != 0 && di < NS) {
723                jstring str = env->NewStringUTF(buffer+start);
724                env->SetObjectArrayElement(outStrings, di, str);
725            }
726            buffer[end] = c;
727            di++;
728        }
729    }
730
731    env->ReleaseIntArrayElements(format, formatData, 0);
732    if (longsData != NULL) {
733        env->ReleaseLongArrayElements(outLongs, longsData, 0);
734    }
735    if (floatsData != NULL) {
736        env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
737    }
738
739    return res;
740}
741
742jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz,
743        jbyteArray buffer, jint startIndex, jint endIndex, jintArray format,
744        jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
745{
746        jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL);
747
748        jboolean result = android_os_Process_parseProcLineArray(env, clazz,
749                (char*) bufferArray, startIndex, endIndex, format, outStrings,
750                outLongs, outFloats);
751
752        env->ReleaseByteArrayElements(buffer, bufferArray, 0);
753
754        return result;
755}
756
757jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz,
758        jstring file, jintArray format, jobjectArray outStrings,
759        jlongArray outLongs, jfloatArray outFloats)
760{
761    if (file == NULL || format == NULL) {
762        jniThrowException(env, "java/lang/NullPointerException", NULL);
763        return JNI_FALSE;
764    }
765
766    const char* file8 = env->GetStringUTFChars(file, NULL);
767    if (file8 == NULL) {
768        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
769        return JNI_FALSE;
770    }
771    int fd = open(file8, O_RDONLY);
772    env->ReleaseStringUTFChars(file, file8);
773
774    if (fd < 0) {
775        //LOGW("Unable to open process file: %s\n", file8);
776        return JNI_FALSE;
777    }
778
779    char buffer[256];
780    const int len = read(fd, buffer, sizeof(buffer)-1);
781    close(fd);
782
783    if (len < 0) {
784        //LOGW("Unable to open process file: %s fd=%d\n", file8, fd);
785        return JNI_FALSE;
786    }
787    buffer[len] = 0;
788
789    return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len,
790            format, outStrings, outLongs, outFloats);
791
792}
793
794void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz,
795                                             jobject binderObject)
796{
797    if (binderObject == NULL) {
798        jniThrowException(env, "java/lang/NullPointerException", NULL);
799        return;
800    }
801
802    sp<IBinder> binder = ibinderForJavaObject(env, binderObject);
803}
804
805void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig)
806{
807    if (pid > 0) {
808        LOGI("Sending signal. PID: %d SIG: %d", pid, sig);
809        kill(pid, sig);
810    }
811}
812
813static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz)
814{
815    struct timespec ts;
816
817    int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
818
819    if (res != 0) {
820        return (jlong) 0;
821    }
822
823    nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
824    return (jlong) nanoseconds_to_milliseconds(when);
825}
826
827static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid)
828{
829    char filename[64];
830
831    snprintf(filename, sizeof(filename), "/proc/%d/smaps", pid);
832
833    FILE * file = fopen(filename, "r");
834    if (!file) {
835        return (jlong) -1;
836    }
837
838    // Tally up all of the Pss from the various maps
839    char line[256];
840    jlong pss = 0;
841    while (fgets(line, sizeof(line), file)) {
842        jlong v;
843        if (sscanf(line, "Pss: %lld kB", &v) == 1) {
844            pss += v;
845        }
846    }
847
848    fclose(file);
849
850    // Return the Pss value in bytes, not kilobytes
851    return pss * 1024;
852}
853
854static const JNINativeMethod methods[] = {
855    {"myPid",       "()I", (void*)android_os_Process_myPid},
856    {"myTid",       "()I", (void*)android_os_Process_myTid},
857    {"myUid",       "()I", (void*)android_os_Process_myUid},
858    {"getUidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName},
859    {"getGidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName},
860    {"setThreadPriority",   "(II)V", (void*)android_os_Process_setThreadPriority},
861    {"setThreadPriority",   "(I)V", (void*)android_os_Process_setCallingThreadPriority},
862    {"getThreadPriority",   "(I)I", (void*)android_os_Process_getThreadPriority},
863    {"setThreadGroup",      "(II)V", (void*)android_os_Process_setThreadGroup},
864    {"setProcessGroup",      "(II)V", (void*)android_os_Process_setProcessGroup},
865    {"setOomAdj",   "(II)Z", (void*)android_os_Process_setOomAdj},
866    {"setArgV0",    "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0},
867    {"setUid", "(I)I", (void*)android_os_Process_setUid},
868    {"setGid", "(I)I", (void*)android_os_Process_setGid},
869    {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal},
870    {"supportsProcesses", "()Z", (void*)android_os_Process_supportsProcesses},
871    {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory},
872    {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines},
873    {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids},
874    {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile},
875    {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine},
876    {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime},
877    {"getPss", "(I)J", (void*)android_os_Process_getPss},
878    //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject},
879};
880
881const char* const kProcessPathName = "android/os/Process";
882
883int register_android_os_Process(JNIEnv* env)
884{
885    jclass clazz;
886
887    clazz = env->FindClass(kProcessPathName);
888    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.Process");
889
890    return AndroidRuntime::registerNativeMethods(
891        env, kProcessPathName,
892        methods, NELEM(methods));
893}
894