android_util_Process.cpp revision 403475a894de8b898c1e0bafdeae2e2f7dd19951 
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 <dirent.h>
36#include <fcntl.h>
37#include <grp.h>
38#include <pwd.h>
39#include <signal.h>
40#include <unistd.h>
41
42#define POLICY_DEBUG 0
43#define GUARD_THREAD_PRIORITY 0
44
45using namespace android;
46
47#if GUARD_THREAD_PRIORITY
48Mutex gKeyCreateMutex;
49static pthread_key_t gBgKey = -1;
50#endif
51
52static void signalExceptionForPriorityError(JNIEnv* env, int err)
53{
54    switch (err) {
55        case EINVAL:
56            jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
57            break;
58        case ESRCH:
59            jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist");
60            break;
61        case EPERM:
62            jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread");
63            break;
64        case EACCES:
65            jniThrowException(env, "java/lang/SecurityException", "No permission to set to given priority");
66            break;
67        default:
68            jniThrowException(env, "java/lang/RuntimeException", "Unknown error");
69            break;
70    }
71}
72
73static void signalExceptionForGroupError(JNIEnv* env, int err)
74{
75    switch (err) {
76        case EINVAL:
77            jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
78            break;
79        case ESRCH:
80            jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist");
81            break;
82        case EPERM:
83            jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread");
84            break;
85        case EACCES:
86            jniThrowException(env, "java/lang/SecurityException", "No permission to set to given group");
87            break;
88        default:
89            jniThrowException(env, "java/lang/RuntimeException", "Unknown error");
90            break;
91    }
92}
93
94jint android_os_Process_myPid(JNIEnv* env, jobject clazz)
95{
96    return getpid();
97}
98
99jint android_os_Process_myUid(JNIEnv* env, jobject clazz)
100{
101    return getuid();
102}
103
104jint android_os_Process_myTid(JNIEnv* env, jobject clazz)
105{
106    return androidGetTid();
107}
108
109jint android_os_Process_getUidForName(JNIEnv* env, jobject clazz, jstring name)
110{
111    if (name == NULL) {
112        jniThrowNullPointerException(env, NULL);
113        return -1;
114    }
115
116    const jchar* str16 = env->GetStringCritical(name, 0);
117    String8 name8;
118    if (str16) {
119        name8 = String8(str16, env->GetStringLength(name));
120        env->ReleaseStringCritical(name, str16);
121    }
122
123    const size_t N = name8.size();
124    if (N > 0) {
125        const char* str = name8.string();
126        for (size_t i=0; i<N; i++) {
127            if (str[i] < '0' || str[i] > '9') {
128                struct passwd* pwd = getpwnam(str);
129                if (pwd == NULL) {
130                    return -1;
131                }
132                return pwd->pw_uid;
133            }
134        }
135        return atoi(str);
136    }
137    return -1;
138}
139
140jint android_os_Process_getGidForName(JNIEnv* env, jobject clazz, jstring name)
141{
142    if (name == NULL) {
143        jniThrowNullPointerException(env, NULL);
144        return -1;
145    }
146
147    const jchar* str16 = env->GetStringCritical(name, 0);
148    String8 name8;
149    if (str16) {
150        name8 = String8(str16, env->GetStringLength(name));
151        env->ReleaseStringCritical(name, str16);
152    }
153
154    const size_t N = name8.size();
155    if (N > 0) {
156        const char* str = name8.string();
157        for (size_t i=0; i<N; i++) {
158            if (str[i] < '0' || str[i] > '9') {
159                struct group* grp = getgrnam(str);
160                if (grp == NULL) {
161                    return -1;
162                }
163                return grp->gr_gid;
164            }
165        }
166        return atoi(str);
167    }
168    return -1;
169}
170
171void android_os_Process_setThreadGroup(JNIEnv* env, jobject clazz, int pid, jint grp)
172{
173    int res = androidSetThreadSchedulingGroup(pid, grp);
174    if (res != NO_ERROR) {
175        signalExceptionForGroupError(env, res == BAD_VALUE ? EINVAL : errno);
176        return;
177    }
178}
179
180void android_os_Process_setProcessGroup(JNIEnv* env, jobject clazz, int pid, jint grp)
181{
182    DIR *d;
183    FILE *fp;
184    char proc_path[255];
185    struct dirent *de;
186
187    if (grp > ANDROID_TGROUP_MAX || grp < 0) {
188        signalExceptionForGroupError(env, EINVAL);
189        return;
190    }
191
192#if POLICY_DEBUG
193    char cmdline[32];
194    int fd;
195
196    strcpy(cmdline, "unknown");
197
198    sprintf(proc_path, "/proc/%d/cmdline", pid);
199    fd = open(proc_path, O_RDONLY);
200    if (fd >= 0) {
201        int rc = read(fd, cmdline, sizeof(cmdline)-1);
202        cmdline[rc] = 0;
203        close(fd);
204    }
205
206    if (grp == ANDROID_TGROUP_BG_NONINTERACT) {
207        ALOGD("setProcessGroup: vvv pid %d (%s)", pid, cmdline);
208    } else {
209        ALOGD("setProcessGroup: ^^^ pid %d (%s)", pid, cmdline);
210    }
211#endif
212    sprintf(proc_path, "/proc/%d/task", pid);
213    if (!(d = opendir(proc_path))) {
214        // If the process exited on us, don't generate an exception
215        if (errno != ENOENT)
216            signalExceptionForGroupError(env, errno);
217        return;
218    }
219
220    while ((de = readdir(d))) {
221        int t_pid;
222        int t_pri;
223
224        if (de->d_name[0] == '.')
225            continue;
226        t_pid = atoi(de->d_name);
227
228        if (!t_pid) {
229            ALOGE("Error getting pid for '%s'\n", de->d_name);
230            continue;
231        }
232
233        t_pri = getpriority(PRIO_PROCESS, t_pid);
234
235        if (grp == ANDROID_TGROUP_DEFAULT &&
236            t_pri >= ANDROID_PRIORITY_BACKGROUND) {
237            // This task wants to stay at background
238            continue;
239        }
240
241        if (androidSetThreadSchedulingGroup(t_pid, grp) != NO_ERROR) {
242            signalExceptionForGroupError(env, errno);
243            break;
244        }
245    }
246    closedir(d);
247}
248
249static void android_os_Process_setCanSelfBackground(JNIEnv* env, jobject clazz, jboolean bgOk) {
250    // Establishes the calling thread as illegal to put into the background.
251    // Typically used only for the system process's main looper.
252#if GUARD_THREAD_PRIORITY
253    ALOGV("Process.setCanSelfBackground(%d) : tid=%d", bgOk, androidGetTid());
254    {
255        Mutex::Autolock _l(gKeyCreateMutex);
256        if (gBgKey == -1) {
257            pthread_key_create(&gBgKey, NULL);
258        }
259    }
260
261    // inverted:  not-okay, we set a sentinel value
262    pthread_setspecific(gBgKey, (void*)(bgOk ? 0 : 0xbaad));
263#endif
264}
265
266void android_os_Process_setThreadScheduler(JNIEnv* env, jclass clazz,
267                                              jint tid, jint policy, jint pri)
268{
269#ifdef HAVE_SCHED_SETSCHEDULER
270    struct sched_param param;
271    param.sched_priority = pri;
272    int rc = sched_setscheduler(tid, policy, &param);
273    if (rc) {
274        signalExceptionForPriorityError(env, errno);
275    }
276#else
277    signalExceptionForPriorityError(env, ENOSYS);
278#endif
279}
280
281void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz,
282                                              jint pid, jint pri)
283{
284#if GUARD_THREAD_PRIORITY
285    // if we're putting the current thread into the background, check the TLS
286    // to make sure this thread isn't guarded.  If it is, raise an exception.
287    if (pri >= ANDROID_PRIORITY_BACKGROUND) {
288        if (pid == androidGetTid()) {
289            void* bgOk = pthread_getspecific(gBgKey);
290            if (bgOk == ((void*)0xbaad)) {
291                ALOGE("Thread marked fg-only put self in background!");
292                jniThrowException(env, "java/lang/SecurityException", "May not put this thread into background");
293                return;
294            }
295        }
296    }
297#endif
298
299    int rc = androidSetThreadPriority(pid, pri);
300    if (rc != 0) {
301        if (rc == INVALID_OPERATION) {
302            signalExceptionForPriorityError(env, errno);
303        } else {
304            signalExceptionForGroupError(env, errno);
305        }
306    }
307
308    //ALOGI("Setting priority of %d: %d, getpriority returns %d\n",
309    //     pid, pri, getpriority(PRIO_PROCESS, pid));
310}
311
312void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz,
313                                                        jint pri)
314{
315    jint tid = android_os_Process_myTid(env, clazz);
316    android_os_Process_setThreadPriority(env, clazz, tid, pri);
317}
318
319jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz,
320                                              jint pid)
321{
322    errno = 0;
323    jint pri = getpriority(PRIO_PROCESS, pid);
324    if (errno != 0) {
325        signalExceptionForPriorityError(env, errno);
326    }
327    //ALOGI("Returning priority of %d: %d\n", pid, pri);
328    return pri;
329}
330
331jboolean android_os_Process_setOomAdj(JNIEnv* env, jobject clazz,
332                                      jint pid, jint adj)
333{
334#ifdef HAVE_OOM_ADJ
335    char text[64];
336    sprintf(text, "/proc/%d/oom_adj", pid);
337    int fd = open(text, O_WRONLY);
338    if (fd >= 0) {
339        sprintf(text, "%d", adj);
340        write(fd, text, strlen(text));
341        close(fd);
342    }
343    return true;
344#endif
345    return false;
346}
347
348void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name)
349{
350    if (name == NULL) {
351        jniThrowNullPointerException(env, NULL);
352        return;
353    }
354
355    const jchar* str = env->GetStringCritical(name, 0);
356    String8 name8;
357    if (str) {
358        name8 = String8(str, env->GetStringLength(name));
359        env->ReleaseStringCritical(name, str);
360    }
361
362    if (name8.size() > 0) {
363        ProcessState::self()->setArgV0(name8.string());
364    }
365}
366
367jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid)
368{
369    return setuid(uid) == 0 ? 0 : errno;
370}
371
372jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid)
373{
374    return setgid(uid) == 0 ? 0 : errno;
375}
376
377static int pid_compare(const void* v1, const void* v2)
378{
379    //ALOGI("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        ALOGW("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        ALOGW("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:"), 0 };
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    //ALOGI("getMemInfo: %p %p", reqFields, outFields);
438
439    if (fileStr == NULL || reqFields == NULL || outFields == NULL) {
440        jniThrowNullPointerException(env, 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            //ALOGI("String at %d: %p = %s", i, obj, str8);
465            if (str8 == NULL) {
466                jniThrowNullPointerException(env, "Element in reqFields");
467                return;
468            }
469            fields.add(String8(str8));
470            env->ReleaseStringUTFChars((jstring)obj, str8);
471        } else {
472            jniThrowNullPointerException(env, "Element in reqFields");
473            return;
474        }
475    }
476
477    jlong* sizesArray = env->GetLongArrayElements(outFields, 0);
478    if (sizesArray == NULL) {
479        return;
480    }
481
482    //ALOGI("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            ALOGW("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            //ALOGI("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                    //ALOGI("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        ALOGW("Unable to open %s", file.string());
539    }
540
541    //ALOGI("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        jniThrowNullPointerException(env, 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        //ALOGI("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        //ALOGI("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        jniThrowNullPointerException(env, 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        //ALOGW("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        //ALOGW("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        jniThrowNullPointerException(env, 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        ALOGI("Sending signal. PID: %d SIG: %d", pid, sig);
810        kill(pid, sig);
811    }
812}
813
814void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig)
815{
816    if (pid > 0) {
817        kill(pid, sig);
818    }
819}
820
821static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz)
822{
823    struct timespec ts;
824
825    int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
826
827    if (res != 0) {
828        return (jlong) 0;
829    }
830
831    nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
832    return (jlong) nanoseconds_to_milliseconds(when);
833}
834
835static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid)
836{
837    char filename[64];
838
839    snprintf(filename, sizeof(filename), "/proc/%d/smaps", pid);
840
841    FILE * file = fopen(filename, "r");
842    if (!file) {
843        return (jlong) -1;
844    }
845
846    // Tally up all of the Pss from the various maps
847    char line[256];
848    jlong pss = 0;
849    while (fgets(line, sizeof(line), file)) {
850        jlong v;
851        if (sscanf(line, "Pss: %lld kB", &v) == 1) {
852            pss += v;
853        }
854    }
855
856    fclose(file);
857
858    // Return the Pss value in bytes, not kilobytes
859    return pss * 1024;
860}
861
862static const JNINativeMethod methods[] = {
863    {"myPid",       "()I", (void*)android_os_Process_myPid},
864    {"myTid",       "()I", (void*)android_os_Process_myTid},
865    {"myUid",       "()I", (void*)android_os_Process_myUid},
866    {"getUidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName},
867    {"getGidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName},
868    {"setThreadPriority",   "(II)V", (void*)android_os_Process_setThreadPriority},
869    {"setThreadScheduler",  "(III)V", (void*)android_os_Process_setThreadScheduler},
870    {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground},
871    {"setThreadPriority",   "(I)V", (void*)android_os_Process_setCallingThreadPriority},
872    {"getThreadPriority",   "(I)I", (void*)android_os_Process_getThreadPriority},
873    {"setThreadGroup",      "(II)V", (void*)android_os_Process_setThreadGroup},
874    {"setProcessGroup",      "(II)V", (void*)android_os_Process_setProcessGroup},
875    {"setOomAdj",   "(II)Z", (void*)android_os_Process_setOomAdj},
876    {"setArgV0",    "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0},
877    {"setUid", "(I)I", (void*)android_os_Process_setUid},
878    {"setGid", "(I)I", (void*)android_os_Process_setGid},
879    {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal},
880    {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet},
881    {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory},
882    {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines},
883    {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids},
884    {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile},
885    {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine},
886    {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime},
887    {"getPss", "(I)J", (void*)android_os_Process_getPss},
888    //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject},
889};
890
891const char* const kProcessPathName = "android/os/Process";
892
893int register_android_os_Process(JNIEnv* env)
894{
895    return AndroidRuntime::registerNativeMethods(
896        env, kProcessPathName,
897        methods, NELEM(methods));
898}
899