android_util_Process.cpp revision 10e89712863f5b91a2982dc1783fbdfe39c1485d 
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#include <unistd.h>
42
43#define POLICY_DEBUG 0
44#define GUARD_THREAD_PRIORITY 0
45
46using namespace android;
47
48#if GUARD_THREAD_PRIORITY
49Mutex gKeyCreateMutex;
50static pthread_key_t gBgKey = -1;
51#endif
52
53static void signalExceptionForPriorityError(JNIEnv* env, jobject obj, int err)
54{
55    switch (err) {
56        case EINVAL:
57            jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
58            break;
59        case ESRCH:
60            jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist");
61            break;
62        case EPERM:
63            jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread");
64            break;
65        case EACCES:
66            jniThrowException(env, "java/lang/SecurityException", "No permission to set to given priority");
67            break;
68        default:
69            jniThrowException(env, "java/lang/RuntimeException", "Unknown error");
70            break;
71    }
72}
73
74static void signalExceptionForGroupError(JNIEnv* env, jobject obj, int err)
75{
76    switch (err) {
77        case EINVAL:
78            jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
79            break;
80        case ESRCH:
81            jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist");
82            break;
83        case EPERM:
84            jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread");
85            break;
86        case EACCES:
87            jniThrowException(env, "java/lang/SecurityException", "No permission to set to given group");
88            break;
89        default:
90            jniThrowException(env, "java/lang/RuntimeException", "Unknown error");
91            break;
92    }
93}
94
95jint android_os_Process_myPid(JNIEnv* env, jobject clazz)
96{
97    return getpid();
98}
99
100jint android_os_Process_myUid(JNIEnv* env, jobject clazz)
101{
102    return getuid();
103}
104
105jint android_os_Process_myTid(JNIEnv* env, jobject clazz)
106{
107    return androidGetTid();
108}
109
110jint android_os_Process_getUidForName(JNIEnv* env, jobject clazz, jstring name)
111{
112    if (name == NULL) {
113        jniThrowNullPointerException(env, NULL);
114        return -1;
115    }
116
117    const jchar* str16 = env->GetStringCritical(name, 0);
118    String8 name8;
119    if (str16) {
120        name8 = String8(str16, env->GetStringLength(name));
121        env->ReleaseStringCritical(name, str16);
122    }
123
124    const size_t N = name8.size();
125    if (N > 0) {
126        const char* str = name8.string();
127        for (size_t i=0; i<N; i++) {
128            if (str[i] < '0' || str[i] > '9') {
129                struct passwd* pwd = getpwnam(str);
130                if (pwd == NULL) {
131                    return -1;
132                }
133                return pwd->pw_uid;
134            }
135        }
136        return atoi(str);
137    }
138    return -1;
139}
140
141jint android_os_Process_getGidForName(JNIEnv* env, jobject clazz, jstring name)
142{
143    if (name == NULL) {
144        jniThrowNullPointerException(env, NULL);
145        return -1;
146    }
147
148    const jchar* str16 = env->GetStringCritical(name, 0);
149    String8 name8;
150    if (str16) {
151        name8 = String8(str16, env->GetStringLength(name));
152        env->ReleaseStringCritical(name, str16);
153    }
154
155    const size_t N = name8.size();
156    if (N > 0) {
157        const char* str = name8.string();
158        for (size_t i=0; i<N; i++) {
159            if (str[i] < '0' || str[i] > '9') {
160                struct group* grp = getgrnam(str);
161                if (grp == NULL) {
162                    return -1;
163                }
164                return grp->gr_gid;
165            }
166        }
167        return atoi(str);
168    }
169    return -1;
170}
171
172void android_os_Process_setThreadGroup(JNIEnv* env, jobject clazz, int pid, jint grp)
173{
174    int res = androidSetThreadSchedulingGroup(pid, grp);
175    if (res != NO_ERROR) {
176        signalExceptionForGroupError(env, clazz, res == BAD_VALUE ? EINVAL : errno);
177        return;
178    }
179}
180
181void android_os_Process_setProcessGroup(JNIEnv* env, jobject clazz, int pid, jint grp)
182{
183    DIR *d;
184    FILE *fp;
185    char proc_path[255];
186    struct dirent *de;
187
188    if (grp > ANDROID_TGROUP_MAX || grp < 0) {
189        signalExceptionForGroupError(env, clazz, EINVAL);
190        return;
191    }
192
193#if POLICY_DEBUG
194    char cmdline[32];
195    int fd;
196
197    strcpy(cmdline, "unknown");
198
199    sprintf(proc_path, "/proc/%d/cmdline", pid);
200    fd = open(proc_path, O_RDONLY);
201    if (fd >= 0) {
202        int rc = read(fd, cmdline, sizeof(cmdline)-1);
203        cmdline[rc] = 0;
204        close(fd);
205    }
206
207    if (grp == ANDROID_TGROUP_BG_NONINTERACT) {
208        LOGD("setProcessGroup: vvv pid %d (%s)", pid, cmdline);
209    } else {
210        LOGD("setProcessGroup: ^^^ pid %d (%s)", pid, cmdline);
211    }
212#endif
213    sprintf(proc_path, "/proc/%d/task", pid);
214    if (!(d = opendir(proc_path))) {
215        // If the process exited on us, don't generate an exception
216        if (errno != ENOENT)
217            signalExceptionForGroupError(env, clazz, errno);
218        return;
219    }
220
221    while ((de = readdir(d))) {
222        int t_pid;
223        int t_pri;
224
225        if (de->d_name[0] == '.')
226            continue;
227        t_pid = atoi(de->d_name);
228
229        if (!t_pid) {
230            LOGE("Error getting pid for '%s'\n", de->d_name);
231            continue;
232        }
233
234        t_pri = getpriority(PRIO_PROCESS, t_pid);
235
236        if (grp == ANDROID_TGROUP_DEFAULT &&
237            t_pri >= ANDROID_PRIORITY_BACKGROUND) {
238            // This task wants to stay at background
239            continue;
240        }
241
242        if (androidSetThreadSchedulingGroup(t_pid, grp) != NO_ERROR) {
243            signalExceptionForGroupError(env, clazz, errno);
244            break;
245        }
246    }
247    closedir(d);
248}
249
250static void android_os_Process_setCanSelfBackground(JNIEnv* env, jobject clazz, jboolean bgOk) {
251    // Establishes the calling thread as illegal to put into the background.
252    // Typically used only for the system process's main looper.
253#if GUARD_THREAD_PRIORITY
254    LOGV("Process.setCanSelfBackground(%d) : tid=%d", bgOk, androidGetTid());
255    {
256        Mutex::Autolock _l(gKeyCreateMutex);
257        if (gBgKey == -1) {
258            pthread_key_create(&gBgKey, NULL);
259        }
260    }
261
262    // inverted:  not-okay, we set a sentinel value
263    pthread_setspecific(gBgKey, (void*)(bgOk ? 0 : 0xbaad));
264#endif
265}
266
267void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz,
268                                              jint pid, jint pri)
269{
270#if GUARD_THREAD_PRIORITY
271    // if we're putting the current thread into the background, check the TLS
272    // to make sure this thread isn't guarded.  If it is, raise an exception.
273    if (pri >= ANDROID_PRIORITY_BACKGROUND) {
274        if (pid == androidGetTid()) {
275            void* bgOk = pthread_getspecific(gBgKey);
276            if (bgOk == ((void*)0xbaad)) {
277                LOGE("Thread marked fg-only put self in background!");
278                jniThrowException(env, "java/lang/SecurityException", "May not put this thread into background");
279                return;
280            }
281        }
282    }
283#endif
284
285    int rc = androidSetThreadPriority(pid, pri);
286    if (rc != 0) {
287        if (rc == INVALID_OPERATION) {
288            signalExceptionForPriorityError(env, clazz, errno);
289        } else {
290            signalExceptionForGroupError(env, clazz, errno);
291        }
292    }
293
294    //LOGI("Setting priority of %d: %d, getpriority returns %d\n",
295    //     pid, pri, getpriority(PRIO_PROCESS, pid));
296}
297
298void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz,
299                                                        jint pri)
300{
301    jint tid = android_os_Process_myTid(env, clazz);
302    android_os_Process_setThreadPriority(env, clazz, tid, pri);
303}
304
305jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz,
306                                              jint pid)
307{
308    errno = 0;
309    jint pri = getpriority(PRIO_PROCESS, pid);
310    if (errno != 0) {
311        signalExceptionForPriorityError(env, clazz, errno);
312    }
313    //LOGI("Returning priority of %d: %d\n", pid, pri);
314    return pri;
315}
316
317jboolean android_os_Process_setOomAdj(JNIEnv* env, jobject clazz,
318                                      jint pid, jint adj)
319{
320#ifdef HAVE_OOM_ADJ
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    }
329    return true;
330#endif
331    return false;
332}
333
334void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name)
335{
336    if (name == NULL) {
337        jniThrowNullPointerException(env, 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
371static int pid_compare(const void* v1, const void* v2)
372{
373    //LOGI("Compare %d vs %d\n", *((const jint*)v1), *((const jint*)v2));
374    return *((const jint*)v1) - *((const jint*)v2);
375}
376
377static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz)
378{
379    int fd = open("/proc/meminfo", O_RDONLY);
380
381    if (fd < 0) {
382        LOGW("Unable to open /proc/meminfo");
383        return -1;
384    }
385
386    char buffer[256];
387    const int len = read(fd, buffer, sizeof(buffer)-1);
388    close(fd);
389
390    if (len < 0) {
391        LOGW("Unable to read /proc/meminfo");
392        return -1;
393    }
394    buffer[len] = 0;
395
396    int numFound = 0;
397    jlong mem = 0;
398
399    static const char* const sums[] = { "MemFree:", "Cached:", NULL };
400    static const int sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), NULL };
401
402    char* p = buffer;
403    while (*p && numFound < 2) {
404        int i = 0;
405        while (sums[i]) {
406            if (strncmp(p, sums[i], sumsLen[i]) == 0) {
407                p += sumsLen[i];
408                while (*p == ' ') p++;
409                char* num = p;
410                while (*p >= '0' && *p <= '9') p++;
411                if (*p != 0) {
412                    *p = 0;
413                    p++;
414                    if (*p == 0) p--;
415                }
416                mem += atoll(num) * 1024;
417                numFound++;
418                break;
419            }
420            i++;
421        }
422        p++;
423    }
424
425    return numFound > 0 ? mem : -1;
426}
427
428void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr,
429                                      jobjectArray reqFields, jlongArray outFields)
430{
431    //LOGI("getMemInfo: %p %p", reqFields, outFields);
432
433    if (fileStr == NULL || reqFields == NULL || outFields == NULL) {
434        jniThrowNullPointerException(env, NULL);
435        return;
436    }
437
438    const char* file8 = env->GetStringUTFChars(fileStr, NULL);
439    if (file8 == NULL) {
440        return;
441    }
442    String8 file(file8);
443    env->ReleaseStringUTFChars(fileStr, file8);
444
445    jsize count = env->GetArrayLength(reqFields);
446    if (count > env->GetArrayLength(outFields)) {
447        jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ");
448        return;
449    }
450
451    Vector<String8> fields;
452    int i;
453
454    for (i=0; i<count; i++) {
455        jobject obj = env->GetObjectArrayElement(reqFields, i);
456        if (obj != NULL) {
457            const char* str8 = env->GetStringUTFChars((jstring)obj, NULL);
458            //LOGI("String at %d: %p = %s", i, obj, str8);
459            if (str8 == NULL) {
460                jniThrowNullPointerException(env, "Element in reqFields");
461                return;
462            }
463            fields.add(String8(str8));
464            env->ReleaseStringUTFChars((jstring)obj, str8);
465        } else {
466            jniThrowNullPointerException(env, "Element in reqFields");
467            return;
468        }
469    }
470
471    jlong* sizesArray = env->GetLongArrayElements(outFields, 0);
472    if (sizesArray == NULL) {
473        return;
474    }
475
476    //LOGI("Clearing %d sizes", count);
477    for (i=0; i<count; i++) {
478        sizesArray[i] = 0;
479    }
480
481    int fd = open(file.string(), O_RDONLY);
482
483    if (fd >= 0) {
484        const size_t BUFFER_SIZE = 2048;
485        char* buffer = (char*)malloc(BUFFER_SIZE);
486        int len = read(fd, buffer, BUFFER_SIZE-1);
487        close(fd);
488
489        if (len < 0) {
490            LOGW("Unable to read %s", file.string());
491            len = 0;
492        }
493        buffer[len] = 0;
494
495        int foundCount = 0;
496
497        char* p = buffer;
498        while (*p && foundCount < count) {
499            bool skipToEol = true;
500            //LOGI("Parsing at: %s", p);
501            for (i=0; i<count; i++) {
502                const String8& field = fields[i];
503                if (strncmp(p, field.string(), field.length()) == 0) {
504                    p += field.length();
505                    while (*p == ' ' || *p == '\t') p++;
506                    char* num = p;
507                    while (*p >= '0' && *p <= '9') p++;
508                    skipToEol = *p != '\n';
509                    if (*p != 0) {
510                        *p = 0;
511                        p++;
512                    }
513                    char* end;
514                    sizesArray[i] = strtoll(num, &end, 10);
515                    //LOGI("Field %s = %d", field.string(), sizesArray[i]);
516                    foundCount++;
517                    break;
518                }
519            }
520            if (skipToEol) {
521                while (*p && *p != '\n') {
522                    p++;
523                }
524                if (*p == '\n') {
525                    p++;
526                }
527            }
528        }
529
530        free(buffer);
531    } else {
532        LOGW("Unable to open %s", file.string());
533    }
534
535    //LOGI("Done!");
536    env->ReleaseLongArrayElements(outFields, sizesArray, 0);
537}
538
539jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz,
540                                     jstring file, jintArray lastArray)
541{
542    if (file == NULL) {
543        jniThrowNullPointerException(env, NULL);
544        return NULL;
545    }
546
547    const char* file8 = env->GetStringUTFChars(file, NULL);
548    if (file8 == NULL) {
549        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
550        return NULL;
551    }
552
553    DIR* dirp = opendir(file8);
554
555    env->ReleaseStringUTFChars(file, file8);
556
557    if(dirp == NULL) {
558        return NULL;
559    }
560
561    jsize curCount = 0;
562    jint* curData = NULL;
563    if (lastArray != NULL) {
564        curCount = env->GetArrayLength(lastArray);
565        curData = env->GetIntArrayElements(lastArray, 0);
566    }
567
568    jint curPos = 0;
569
570    struct dirent* entry;
571    while ((entry=readdir(dirp)) != NULL) {
572        const char* p = entry->d_name;
573        while (*p) {
574            if (*p < '0' || *p > '9') break;
575            p++;
576        }
577        if (*p != 0) continue;
578
579        char* end;
580        int pid = strtol(entry->d_name, &end, 10);
581        //LOGI("File %s pid=%d\n", entry->d_name, pid);
582        if (curPos >= curCount) {
583            jsize newCount = (curCount == 0) ? 10 : (curCount*2);
584            jintArray newArray = env->NewIntArray(newCount);
585            if (newArray == NULL) {
586                closedir(dirp);
587                jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
588                return NULL;
589            }
590            jint* newData = env->GetIntArrayElements(newArray, 0);
591            if (curData != NULL) {
592                memcpy(newData, curData, sizeof(jint)*curCount);
593                env->ReleaseIntArrayElements(lastArray, curData, 0);
594            }
595            lastArray = newArray;
596            curCount = newCount;
597            curData = newData;
598        }
599
600        curData[curPos] = pid;
601        curPos++;
602    }
603
604    closedir(dirp);
605
606    if (curData != NULL && curPos > 0) {
607        qsort(curData, curPos, sizeof(jint), pid_compare);
608    }
609
610    while (curPos < curCount) {
611        curData[curPos] = -1;
612        curPos++;
613    }
614
615    if (curData != NULL) {
616        env->ReleaseIntArrayElements(lastArray, curData, 0);
617    }
618
619    return lastArray;
620}
621
622enum {
623    PROC_TERM_MASK = 0xff,
624    PROC_ZERO_TERM = 0,
625    PROC_SPACE_TERM = ' ',
626    PROC_COMBINE = 0x100,
627    PROC_PARENS = 0x200,
628    PROC_OUT_STRING = 0x1000,
629    PROC_OUT_LONG = 0x2000,
630    PROC_OUT_FLOAT = 0x4000,
631};
632
633jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz,
634        char* buffer, jint startIndex, jint endIndex, jintArray format,
635        jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
636{
637
638    const jsize NF = env->GetArrayLength(format);
639    const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0;
640    const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0;
641    const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0;
642
643    jint* formatData = env->GetIntArrayElements(format, 0);
644    jlong* longsData = outLongs ?
645        env->GetLongArrayElements(outLongs, 0) : NULL;
646    jfloat* floatsData = outFloats ?
647        env->GetFloatArrayElements(outFloats, 0) : NULL;
648    if (formatData == NULL || (NL > 0 && longsData == NULL)
649            || (NR > 0 && floatsData == NULL)) {
650        if (formatData != NULL) {
651            env->ReleaseIntArrayElements(format, formatData, 0);
652        }
653        if (longsData != NULL) {
654            env->ReleaseLongArrayElements(outLongs, longsData, 0);
655        }
656        if (floatsData != NULL) {
657            env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
658        }
659        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
660        return JNI_FALSE;
661    }
662
663    jsize i = startIndex;
664    jsize di = 0;
665
666    jboolean res = JNI_TRUE;
667
668    for (jsize fi=0; fi<NF; fi++) {
669        const jint mode = formatData[fi];
670        if ((mode&PROC_PARENS) != 0) {
671            i++;
672        }
673        const char term = (char)(mode&PROC_TERM_MASK);
674        const jsize start = i;
675        if (i >= endIndex) {
676            res = JNI_FALSE;
677            break;
678        }
679
680        jsize end = -1;
681        if ((mode&PROC_PARENS) != 0) {
682            while (buffer[i] != ')' && i < endIndex) {
683                i++;
684            }
685            end = i;
686            i++;
687        }
688        while (buffer[i] != term && i < endIndex) {
689            i++;
690        }
691        if (end < 0) {
692            end = i;
693        }
694
695        if (i < endIndex) {
696            i++;
697            if ((mode&PROC_COMBINE) != 0) {
698                while (buffer[i] == term && i < endIndex) {
699                    i++;
700                }
701            }
702        }
703
704        //LOGI("Field %d: %d-%d dest=%d mode=0x%x\n", i, start, end, di, mode);
705
706        if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) {
707            char c = buffer[end];
708            buffer[end] = 0;
709            if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) {
710                char* end;
711                floatsData[di] = strtof(buffer+start, &end);
712            }
713            if ((mode&PROC_OUT_LONG) != 0 && di < NL) {
714                char* end;
715                longsData[di] = strtoll(buffer+start, &end, 10);
716            }
717            if ((mode&PROC_OUT_STRING) != 0 && di < NS) {
718                jstring str = env->NewStringUTF(buffer+start);
719                env->SetObjectArrayElement(outStrings, di, str);
720            }
721            buffer[end] = c;
722            di++;
723        }
724    }
725
726    env->ReleaseIntArrayElements(format, formatData, 0);
727    if (longsData != NULL) {
728        env->ReleaseLongArrayElements(outLongs, longsData, 0);
729    }
730    if (floatsData != NULL) {
731        env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
732    }
733
734    return res;
735}
736
737jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz,
738        jbyteArray buffer, jint startIndex, jint endIndex, jintArray format,
739        jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
740{
741        jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL);
742
743        jboolean result = android_os_Process_parseProcLineArray(env, clazz,
744                (char*) bufferArray, startIndex, endIndex, format, outStrings,
745                outLongs, outFloats);
746
747        env->ReleaseByteArrayElements(buffer, bufferArray, 0);
748
749        return result;
750}
751
752jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz,
753        jstring file, jintArray format, jobjectArray outStrings,
754        jlongArray outLongs, jfloatArray outFloats)
755{
756    if (file == NULL || format == NULL) {
757        jniThrowNullPointerException(env, NULL);
758        return JNI_FALSE;
759    }
760
761    const char* file8 = env->GetStringUTFChars(file, NULL);
762    if (file8 == NULL) {
763        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
764        return JNI_FALSE;
765    }
766    int fd = open(file8, O_RDONLY);
767    env->ReleaseStringUTFChars(file, file8);
768
769    if (fd < 0) {
770        //LOGW("Unable to open process file: %s\n", file8);
771        return JNI_FALSE;
772    }
773
774    char buffer[256];
775    const int len = read(fd, buffer, sizeof(buffer)-1);
776    close(fd);
777
778    if (len < 0) {
779        //LOGW("Unable to open process file: %s fd=%d\n", file8, fd);
780        return JNI_FALSE;
781    }
782    buffer[len] = 0;
783
784    return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len,
785            format, outStrings, outLongs, outFloats);
786
787}
788
789void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz,
790                                             jobject binderObject)
791{
792    if (binderObject == NULL) {
793        jniThrowNullPointerException(env, NULL);
794        return;
795    }
796
797    sp<IBinder> binder = ibinderForJavaObject(env, binderObject);
798}
799
800void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig)
801{
802    if (pid > 0) {
803        LOGI("Sending signal. PID: %d SIG: %d", pid, sig);
804        kill(pid, sig);
805    }
806}
807
808void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig)
809{
810    if (pid > 0) {
811        kill(pid, sig);
812    }
813}
814
815static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz)
816{
817    struct timespec ts;
818
819    int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
820
821    if (res != 0) {
822        return (jlong) 0;
823    }
824
825    nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
826    return (jlong) nanoseconds_to_milliseconds(when);
827}
828
829static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid)
830{
831    char filename[64];
832
833    snprintf(filename, sizeof(filename), "/proc/%d/smaps", pid);
834
835    FILE * file = fopen(filename, "r");
836    if (!file) {
837        return (jlong) -1;
838    }
839
840    // Tally up all of the Pss from the various maps
841    char line[256];
842    jlong pss = 0;
843    while (fgets(line, sizeof(line), file)) {
844        jlong v;
845        if (sscanf(line, "Pss: %lld kB", &v) == 1) {
846            pss += v;
847        }
848    }
849
850    fclose(file);
851
852    // Return the Pss value in bytes, not kilobytes
853    return pss * 1024;
854}
855
856static const JNINativeMethod methods[] = {
857    {"myPid",       "()I", (void*)android_os_Process_myPid},
858    {"myTid",       "()I", (void*)android_os_Process_myTid},
859    {"myUid",       "()I", (void*)android_os_Process_myUid},
860    {"getUidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName},
861    {"getGidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName},
862    {"setThreadPriority",   "(II)V", (void*)android_os_Process_setThreadPriority},
863    {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground},
864    {"setThreadPriority",   "(I)V", (void*)android_os_Process_setCallingThreadPriority},
865    {"getThreadPriority",   "(I)I", (void*)android_os_Process_getThreadPriority},
866    {"setThreadGroup",      "(II)V", (void*)android_os_Process_setThreadGroup},
867    {"setProcessGroup",      "(II)V", (void*)android_os_Process_setProcessGroup},
868    {"setOomAdj",   "(II)Z", (void*)android_os_Process_setOomAdj},
869    {"setArgV0",    "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0},
870    {"setUid", "(I)I", (void*)android_os_Process_setUid},
871    {"setGid", "(I)I", (void*)android_os_Process_setGid},
872    {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal},
873    {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet},
874    {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory},
875    {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines},
876    {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids},
877    {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile},
878    {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine},
879    {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime},
880    {"getPss", "(I)J", (void*)android_os_Process_getPss},
881    //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject},
882};
883
884const char* const kProcessPathName = "android/os/Process";
885
886int register_android_os_Process(JNIEnv* env)
887{
888    return AndroidRuntime::registerNativeMethods(
889        env, kProcessPathName,
890        methods, NELEM(methods));
891}
892