android_util_Process.cpp revision d195e5ab401432ddac659791640a2927fc668699 
1/* //device/libs/android_runtime/android_util_Process.cpp
2**
3** Copyright 2006, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18#define LOG_TAG "Process"
19
20#include <utils/Log.h>
21#include <binder/IPCThreadState.h>
22#include <binder/ProcessState.h>
23#include <binder/IServiceManager.h>
24#include <utils/String8.h>
25#include <utils/Vector.h>
26
27#include <android_runtime/AndroidRuntime.h>
28
29#include "android_util_Binder.h"
30#include "JNIHelp.h"
31
32#include <sys/errno.h>
33#include <sys/resource.h>
34#include <sys/types.h>
35#include <cutils/sched_policy.h>
36#include <dirent.h>
37#include <fcntl.h>
38#include <grp.h>
39#include <pwd.h>
40#include <signal.h>
41
42/* desktop Linux needs a little help with gettid() */
43#if defined(HAVE_GETTID) && !defined(HAVE_ANDROID_OS)
44#define __KERNEL__
45# include <linux/unistd.h>
46#ifdef _syscall0
47_syscall0(pid_t,gettid)
48#else
49pid_t gettid() { return syscall(__NR_gettid);}
50#endif
51#undef __KERNEL__
52#endif
53
54#define POLICY_DEBUG 0
55#define GUARD_THREAD_PRIORITY 0
56
57using namespace android;
58
59#if GUARD_THREAD_PRIORITY
60Mutex gKeyCreateMutex;
61static pthread_key_t gBgKey = -1;
62#endif
63
64static void signalExceptionForPriorityError(JNIEnv* env, jobject obj, int err)
65{
66    switch (err) {
67        case EINVAL:
68            jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
69            break;
70        case ESRCH:
71            jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist");
72            break;
73        case EPERM:
74            jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread");
75            break;
76        case EACCES:
77            jniThrowException(env, "java/lang/SecurityException", "No permission to set to given priority");
78            break;
79        default:
80            jniThrowException(env, "java/lang/RuntimeException", "Unknown error");
81            break;
82    }
83}
84
85static void signalExceptionForGroupError(JNIEnv* env, jobject obj, int err)
86{
87    switch (err) {
88        case EINVAL:
89            jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
90            break;
91        case ESRCH:
92            jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist");
93            break;
94        case EPERM:
95            jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread");
96            break;
97        case EACCES:
98            jniThrowException(env, "java/lang/SecurityException", "No permission to set to given group");
99            break;
100        default:
101            jniThrowException(env, "java/lang/RuntimeException", "Unknown error");
102            break;
103    }
104}
105
106jint android_os_Process_myPid(JNIEnv* env, jobject clazz)
107{
108    return getpid();
109}
110
111jint android_os_Process_myUid(JNIEnv* env, jobject clazz)
112{
113    return getuid();
114}
115
116jint android_os_Process_myTid(JNIEnv* env, jobject clazz)
117{
118    return androidGetTid();
119}
120
121jint android_os_Process_getUidForName(JNIEnv* env, jobject clazz, jstring name)
122{
123    if (name == NULL) {
124        jniThrowNullPointerException(env, NULL);
125        return -1;
126    }
127
128    const jchar* str16 = env->GetStringCritical(name, 0);
129    String8 name8;
130    if (str16) {
131        name8 = String8(str16, env->GetStringLength(name));
132        env->ReleaseStringCritical(name, str16);
133    }
134
135    const size_t N = name8.size();
136    if (N > 0) {
137        const char* str = name8.string();
138        for (size_t i=0; i<N; i++) {
139            if (str[i] < '0' || str[i] > '9') {
140                struct passwd* pwd = getpwnam(str);
141                if (pwd == NULL) {
142                    return -1;
143                }
144                return pwd->pw_uid;
145            }
146        }
147        return atoi(str);
148    }
149    return -1;
150}
151
152jint android_os_Process_getGidForName(JNIEnv* env, jobject clazz, jstring name)
153{
154    if (name == NULL) {
155        jniThrowNullPointerException(env, NULL);
156        return -1;
157    }
158
159    const jchar* str16 = env->GetStringCritical(name, 0);
160    String8 name8;
161    if (str16) {
162        name8 = String8(str16, env->GetStringLength(name));
163        env->ReleaseStringCritical(name, str16);
164    }
165
166    const size_t N = name8.size();
167    if (N > 0) {
168        const char* str = name8.string();
169        for (size_t i=0; i<N; i++) {
170            if (str[i] < '0' || str[i] > '9') {
171                struct group* grp = getgrnam(str);
172                if (grp == NULL) {
173                    return -1;
174                }
175                return grp->gr_gid;
176            }
177        }
178        return atoi(str);
179    }
180    return -1;
181}
182
183void android_os_Process_setThreadGroup(JNIEnv* env, jobject clazz, int pid, jint grp)
184{
185    int res = androidSetThreadSchedulingGroup(pid, grp);
186    if (res != NO_ERROR) {
187        signalExceptionForGroupError(env, clazz, res == BAD_VALUE ? EINVAL : errno);
188        return;
189    }
190}
191
192void android_os_Process_setProcessGroup(JNIEnv* env, jobject clazz, int pid, jint grp)
193{
194    DIR *d;
195    FILE *fp;
196    char proc_path[255];
197    struct dirent *de;
198
199    if (grp > ANDROID_TGROUP_MAX || grp < 0) {
200        signalExceptionForGroupError(env, clazz, EINVAL);
201        return;
202    }
203
204#if POLICY_DEBUG
205    char cmdline[32];
206    int fd;
207
208    strcpy(cmdline, "unknown");
209
210    sprintf(proc_path, "/proc/%d/cmdline", pid);
211    fd = open(proc_path, O_RDONLY);
212    if (fd >= 0) {
213        int rc = read(fd, cmdline, sizeof(cmdline)-1);
214        cmdline[rc] = 0;
215        close(fd);
216    }
217
218    if (grp == ANDROID_TGROUP_BG_NONINTERACT) {
219        LOGD("setProcessGroup: vvv pid %d (%s)", pid, cmdline);
220    } else {
221        LOGD("setProcessGroup: ^^^ pid %d (%s)", pid, cmdline);
222    }
223#endif
224    sprintf(proc_path, "/proc/%d/task", pid);
225    if (!(d = opendir(proc_path))) {
226        // If the process exited on us, don't generate an exception
227        if (errno != ENOENT)
228            signalExceptionForGroupError(env, clazz, errno);
229        return;
230    }
231
232    while ((de = readdir(d))) {
233        int t_pid;
234        int t_pri;
235
236        if (de->d_name[0] == '.')
237            continue;
238        t_pid = atoi(de->d_name);
239
240        if (!t_pid) {
241            LOGE("Error getting pid for '%s'\n", de->d_name);
242            continue;
243        }
244
245        t_pri = getpriority(PRIO_PROCESS, t_pid);
246
247        if (grp == ANDROID_TGROUP_DEFAULT &&
248            t_pri >= ANDROID_PRIORITY_BACKGROUND) {
249            // This task wants to stay at background
250            continue;
251        }
252
253        if (androidSetThreadSchedulingGroup(t_pid, grp) != NO_ERROR) {
254            signalExceptionForGroupError(env, clazz, errno);
255            break;
256        }
257    }
258    closedir(d);
259}
260
261static void android_os_Process_setCanSelfBackground(JNIEnv* env, jobject clazz, jboolean bgOk) {
262    // Establishes the calling thread as illegal to put into the background.
263    // Typically used only for the system process's main looper.
264#if GUARD_THREAD_PRIORITY
265    LOGV("Process.setCanSelfBackground(%d) : tid=%d", bgOk, androidGetTid());
266    {
267        Mutex::Autolock _l(gKeyCreateMutex);
268        if (gBgKey == -1) {
269            pthread_key_create(&gBgKey, NULL);
270        }
271    }
272
273    // inverted:  not-okay, we set a sentinel value
274    pthread_setspecific(gBgKey, (void*)(bgOk ? 0 : 0xbaad));
275#endif
276}
277
278void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz,
279                                              jint pid, jint pri)
280{
281#if GUARD_THREAD_PRIORITY
282    // if we're putting the current thread into the background, check the TLS
283    // to make sure this thread isn't guarded.  If it is, raise an exception.
284    if (pri >= ANDROID_PRIORITY_BACKGROUND) {
285        if (pid == androidGetTid()) {
286            void* bgOk = pthread_getspecific(gBgKey);
287            if (bgOk == ((void*)0xbaad)) {
288                LOGE("Thread marked fg-only put self in background!");
289                jniThrowException(env, "java/lang/SecurityException", "May not put this thread into background");
290                return;
291            }
292        }
293    }
294#endif
295
296    int rc = androidSetThreadPriority(pid, pri);
297    if (rc != 0) {
298        if (rc == INVALID_OPERATION) {
299            signalExceptionForPriorityError(env, clazz, errno);
300        } else {
301            signalExceptionForGroupError(env, clazz, errno);
302        }
303    }
304
305    //LOGI("Setting priority of %d: %d, getpriority returns %d\n",
306    //     pid, pri, getpriority(PRIO_PROCESS, pid));
307}
308
309void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz,
310                                                        jint pri)
311{
312    jint tid = android_os_Process_myTid(env, clazz);
313    android_os_Process_setThreadPriority(env, clazz, tid, pri);
314}
315
316jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz,
317                                              jint pid)
318{
319    errno = 0;
320    jint pri = getpriority(PRIO_PROCESS, pid);
321    if (errno != 0) {
322        signalExceptionForPriorityError(env, clazz, errno);
323    }
324    //LOGI("Returning priority of %d: %d\n", pid, pri);
325    return pri;
326}
327
328jboolean android_os_Process_setOomAdj(JNIEnv* env, jobject clazz,
329                                      jint pid, jint adj)
330{
331#ifdef HAVE_OOM_ADJ
332    if (ProcessState::self()->supportsProcesses()) {
333        char text[64];
334        sprintf(text, "/proc/%d/oom_adj", pid);
335        int fd = open(text, O_WRONLY);
336        if (fd >= 0) {
337            sprintf(text, "%d", adj);
338            write(fd, text, strlen(text));
339            close(fd);
340        }
341        return true;
342    }
343#endif
344    return false;
345}
346
347void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name)
348{
349    if (name == NULL) {
350        jniThrowNullPointerException(env, NULL);
351        return;
352    }
353
354    const jchar* str = env->GetStringCritical(name, 0);
355    String8 name8;
356    if (str) {
357        name8 = String8(str, env->GetStringLength(name));
358        env->ReleaseStringCritical(name, str);
359    }
360
361    if (name8.size() > 0) {
362        ProcessState::self()->setArgV0(name8.string());
363    }
364}
365
366jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid)
367{
368    #if HAVE_ANDROID_OS
369    return setuid(uid) == 0 ? 0 : errno;
370    #else
371    return ENOSYS;
372    #endif
373}
374
375jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid)
376{
377    #if HAVE_ANDROID_OS
378    return setgid(uid) == 0 ? 0 : errno;
379    #else
380    return ENOSYS;
381    #endif
382}
383
384jboolean android_os_Process_supportsProcesses(JNIEnv* env, jobject clazz)
385{
386    return ProcessState::self()->supportsProcesses();
387}
388
389static int pid_compare(const void* v1, const void* v2)
390{
391    //LOGI("Compare %d vs %d\n", *((const jint*)v1), *((const jint*)v2));
392    return *((const jint*)v1) - *((const jint*)v2);
393}
394
395static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz)
396{
397    int fd = open("/proc/meminfo", O_RDONLY);
398
399    if (fd < 0) {
400        LOGW("Unable to open /proc/meminfo");
401        return -1;
402    }
403
404    char buffer[256];
405    const int len = read(fd, buffer, sizeof(buffer)-1);
406    close(fd);
407
408    if (len < 0) {
409        LOGW("Unable to read /proc/meminfo");
410        return -1;
411    }
412    buffer[len] = 0;
413
414    int numFound = 0;
415    jlong mem = 0;
416
417    static const char* const sums[] = { "MemFree:", "Cached:", NULL };
418    static const int sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), NULL };
419
420    char* p = buffer;
421    while (*p && numFound < 2) {
422        int i = 0;
423        while (sums[i]) {
424            if (strncmp(p, sums[i], sumsLen[i]) == 0) {
425                p += sumsLen[i];
426                while (*p == ' ') p++;
427                char* num = p;
428                while (*p >= '0' && *p <= '9') p++;
429                if (*p != 0) {
430                    *p = 0;
431                    p++;
432                    if (*p == 0) p--;
433                }
434                mem += atoll(num) * 1024;
435                numFound++;
436                break;
437            }
438            i++;
439        }
440        p++;
441    }
442
443    return numFound > 0 ? mem : -1;
444}
445
446void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr,
447                                      jobjectArray reqFields, jlongArray outFields)
448{
449    //LOGI("getMemInfo: %p %p", reqFields, outFields);
450
451    if (fileStr == NULL || reqFields == NULL || outFields == NULL) {
452        jniThrowNullPointerException(env, NULL);
453        return;
454    }
455
456    const char* file8 = env->GetStringUTFChars(fileStr, NULL);
457    if (file8 == NULL) {
458        return;
459    }
460    String8 file(file8);
461    env->ReleaseStringUTFChars(fileStr, file8);
462
463    jsize count = env->GetArrayLength(reqFields);
464    if (count > env->GetArrayLength(outFields)) {
465        jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ");
466        return;
467    }
468
469    Vector<String8> fields;
470    int i;
471
472    for (i=0; i<count; i++) {
473        jobject obj = env->GetObjectArrayElement(reqFields, i);
474        if (obj != NULL) {
475            const char* str8 = env->GetStringUTFChars((jstring)obj, NULL);
476            //LOGI("String at %d: %p = %s", i, obj, str8);
477            if (str8 == NULL) {
478                jniThrowNullPointerException(env, "Element in reqFields");
479                return;
480            }
481            fields.add(String8(str8));
482            env->ReleaseStringUTFChars((jstring)obj, str8);
483        } else {
484            jniThrowNullPointerException(env, "Element in reqFields");
485            return;
486        }
487    }
488
489    jlong* sizesArray = env->GetLongArrayElements(outFields, 0);
490    if (sizesArray == NULL) {
491        return;
492    }
493
494    //LOGI("Clearing %d sizes", count);
495    for (i=0; i<count; i++) {
496        sizesArray[i] = 0;
497    }
498
499    int fd = open(file.string(), O_RDONLY);
500
501    if (fd >= 0) {
502        const size_t BUFFER_SIZE = 2048;
503        char* buffer = (char*)malloc(BUFFER_SIZE);
504        int len = read(fd, buffer, BUFFER_SIZE-1);
505        close(fd);
506
507        if (len < 0) {
508            LOGW("Unable to read %s", file.string());
509            len = 0;
510        }
511        buffer[len] = 0;
512
513        int foundCount = 0;
514
515        char* p = buffer;
516        while (*p && foundCount < count) {
517            bool skipToEol = true;
518            //LOGI("Parsing at: %s", p);
519            for (i=0; i<count; i++) {
520                const String8& field = fields[i];
521                if (strncmp(p, field.string(), field.length()) == 0) {
522                    p += field.length();
523                    while (*p == ' ' || *p == '\t') p++;
524                    char* num = p;
525                    while (*p >= '0' && *p <= '9') p++;
526                    skipToEol = *p != '\n';
527                    if (*p != 0) {
528                        *p = 0;
529                        p++;
530                    }
531                    char* end;
532                    sizesArray[i] = strtoll(num, &end, 10);
533                    //LOGI("Field %s = %d", field.string(), sizesArray[i]);
534                    foundCount++;
535                    break;
536                }
537            }
538            if (skipToEol) {
539                while (*p && *p != '\n') {
540                    p++;
541                }
542                if (*p == '\n') {
543                    p++;
544                }
545            }
546        }
547
548        free(buffer);
549    } else {
550        LOGW("Unable to open %s", file.string());
551    }
552
553    //LOGI("Done!");
554    env->ReleaseLongArrayElements(outFields, sizesArray, 0);
555}
556
557jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz,
558                                     jstring file, jintArray lastArray)
559{
560    if (file == NULL) {
561        jniThrowNullPointerException(env, NULL);
562        return NULL;
563    }
564
565    const char* file8 = env->GetStringUTFChars(file, NULL);
566    if (file8 == NULL) {
567        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
568        return NULL;
569    }
570
571    DIR* dirp = opendir(file8);
572
573    env->ReleaseStringUTFChars(file, file8);
574
575    if(dirp == NULL) {
576        return NULL;
577    }
578
579    jsize curCount = 0;
580    jint* curData = NULL;
581    if (lastArray != NULL) {
582        curCount = env->GetArrayLength(lastArray);
583        curData = env->GetIntArrayElements(lastArray, 0);
584    }
585
586    jint curPos = 0;
587
588    struct dirent* entry;
589    while ((entry=readdir(dirp)) != NULL) {
590        const char* p = entry->d_name;
591        while (*p) {
592            if (*p < '0' || *p > '9') break;
593            p++;
594        }
595        if (*p != 0) continue;
596
597        char* end;
598        int pid = strtol(entry->d_name, &end, 10);
599        //LOGI("File %s pid=%d\n", entry->d_name, pid);
600        if (curPos >= curCount) {
601            jsize newCount = (curCount == 0) ? 10 : (curCount*2);
602            jintArray newArray = env->NewIntArray(newCount);
603            if (newArray == NULL) {
604                closedir(dirp);
605                jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
606                return NULL;
607            }
608            jint* newData = env->GetIntArrayElements(newArray, 0);
609            if (curData != NULL) {
610                memcpy(newData, curData, sizeof(jint)*curCount);
611                env->ReleaseIntArrayElements(lastArray, curData, 0);
612            }
613            lastArray = newArray;
614            curCount = newCount;
615            curData = newData;
616        }
617
618        curData[curPos] = pid;
619        curPos++;
620    }
621
622    closedir(dirp);
623
624    if (curData != NULL && curPos > 0) {
625        qsort(curData, curPos, sizeof(jint), pid_compare);
626    }
627
628    while (curPos < curCount) {
629        curData[curPos] = -1;
630        curPos++;
631    }
632
633    if (curData != NULL) {
634        env->ReleaseIntArrayElements(lastArray, curData, 0);
635    }
636
637    return lastArray;
638}
639
640enum {
641    PROC_TERM_MASK = 0xff,
642    PROC_ZERO_TERM = 0,
643    PROC_SPACE_TERM = ' ',
644    PROC_COMBINE = 0x100,
645    PROC_PARENS = 0x200,
646    PROC_OUT_STRING = 0x1000,
647    PROC_OUT_LONG = 0x2000,
648    PROC_OUT_FLOAT = 0x4000,
649};
650
651jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz,
652        char* buffer, jint startIndex, jint endIndex, jintArray format,
653        jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
654{
655
656    const jsize NF = env->GetArrayLength(format);
657    const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0;
658    const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0;
659    const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0;
660
661    jint* formatData = env->GetIntArrayElements(format, 0);
662    jlong* longsData = outLongs ?
663        env->GetLongArrayElements(outLongs, 0) : NULL;
664    jfloat* floatsData = outFloats ?
665        env->GetFloatArrayElements(outFloats, 0) : NULL;
666    if (formatData == NULL || (NL > 0 && longsData == NULL)
667            || (NR > 0 && floatsData == NULL)) {
668        if (formatData != NULL) {
669            env->ReleaseIntArrayElements(format, formatData, 0);
670        }
671        if (longsData != NULL) {
672            env->ReleaseLongArrayElements(outLongs, longsData, 0);
673        }
674        if (floatsData != NULL) {
675            env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
676        }
677        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
678        return JNI_FALSE;
679    }
680
681    jsize i = startIndex;
682    jsize di = 0;
683
684    jboolean res = JNI_TRUE;
685
686    for (jsize fi=0; fi<NF; fi++) {
687        const jint mode = formatData[fi];
688        if ((mode&PROC_PARENS) != 0) {
689            i++;
690        }
691        const char term = (char)(mode&PROC_TERM_MASK);
692        const jsize start = i;
693        if (i >= endIndex) {
694            res = JNI_FALSE;
695            break;
696        }
697
698        jsize end = -1;
699        if ((mode&PROC_PARENS) != 0) {
700            while (buffer[i] != ')' && i < endIndex) {
701                i++;
702            }
703            end = i;
704            i++;
705        }
706        while (buffer[i] != term && i < endIndex) {
707            i++;
708        }
709        if (end < 0) {
710            end = i;
711        }
712
713        if (i < endIndex) {
714            i++;
715            if ((mode&PROC_COMBINE) != 0) {
716                while (buffer[i] == term && i < endIndex) {
717                    i++;
718                }
719            }
720        }
721
722        //LOGI("Field %d: %d-%d dest=%d mode=0x%x\n", i, start, end, di, mode);
723
724        if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) {
725            char c = buffer[end];
726            buffer[end] = 0;
727            if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) {
728                char* end;
729                floatsData[di] = strtof(buffer+start, &end);
730            }
731            if ((mode&PROC_OUT_LONG) != 0 && di < NL) {
732                char* end;
733                longsData[di] = strtoll(buffer+start, &end, 10);
734            }
735            if ((mode&PROC_OUT_STRING) != 0 && di < NS) {
736                jstring str = env->NewStringUTF(buffer+start);
737                env->SetObjectArrayElement(outStrings, di, str);
738            }
739            buffer[end] = c;
740            di++;
741        }
742    }
743
744    env->ReleaseIntArrayElements(format, formatData, 0);
745    if (longsData != NULL) {
746        env->ReleaseLongArrayElements(outLongs, longsData, 0);
747    }
748    if (floatsData != NULL) {
749        env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
750    }
751
752    return res;
753}
754
755jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz,
756        jbyteArray buffer, jint startIndex, jint endIndex, jintArray format,
757        jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
758{
759        jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL);
760
761        jboolean result = android_os_Process_parseProcLineArray(env, clazz,
762                (char*) bufferArray, startIndex, endIndex, format, outStrings,
763                outLongs, outFloats);
764
765        env->ReleaseByteArrayElements(buffer, bufferArray, 0);
766
767        return result;
768}
769
770jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz,
771        jstring file, jintArray format, jobjectArray outStrings,
772        jlongArray outLongs, jfloatArray outFloats)
773{
774    if (file == NULL || format == NULL) {
775        jniThrowNullPointerException(env, NULL);
776        return JNI_FALSE;
777    }
778
779    const char* file8 = env->GetStringUTFChars(file, NULL);
780    if (file8 == NULL) {
781        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
782        return JNI_FALSE;
783    }
784    int fd = open(file8, O_RDONLY);
785    env->ReleaseStringUTFChars(file, file8);
786
787    if (fd < 0) {
788        //LOGW("Unable to open process file: %s\n", file8);
789        return JNI_FALSE;
790    }
791
792    char buffer[256];
793    const int len = read(fd, buffer, sizeof(buffer)-1);
794    close(fd);
795
796    if (len < 0) {
797        //LOGW("Unable to open process file: %s fd=%d\n", file8, fd);
798        return JNI_FALSE;
799    }
800    buffer[len] = 0;
801
802    return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len,
803            format, outStrings, outLongs, outFloats);
804
805}
806
807void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz,
808                                             jobject binderObject)
809{
810    if (binderObject == NULL) {
811        jniThrowNullPointerException(env, NULL);
812        return;
813    }
814
815    sp<IBinder> binder = ibinderForJavaObject(env, binderObject);
816}
817
818void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig)
819{
820    if (pid > 0) {
821        LOGI("Sending signal. PID: %d SIG: %d", pid, sig);
822        kill(pid, sig);
823    }
824}
825
826void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig)
827{
828    if (pid > 0) {
829        kill(pid, sig);
830    }
831}
832
833static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz)
834{
835    struct timespec ts;
836
837    int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
838
839    if (res != 0) {
840        return (jlong) 0;
841    }
842
843    nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
844    return (jlong) nanoseconds_to_milliseconds(when);
845}
846
847static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid)
848{
849    char filename[64];
850
851    snprintf(filename, sizeof(filename), "/proc/%d/smaps", pid);
852
853    FILE * file = fopen(filename, "r");
854    if (!file) {
855        return (jlong) -1;
856    }
857
858    // Tally up all of the Pss from the various maps
859    char line[256];
860    jlong pss = 0;
861    while (fgets(line, sizeof(line), file)) {
862        jlong v;
863        if (sscanf(line, "Pss: %lld kB", &v) == 1) {
864            pss += v;
865        }
866    }
867
868    fclose(file);
869
870    // Return the Pss value in bytes, not kilobytes
871    return pss * 1024;
872}
873
874static const JNINativeMethod methods[] = {
875    {"myPid",       "()I", (void*)android_os_Process_myPid},
876    {"myTid",       "()I", (void*)android_os_Process_myTid},
877    {"myUid",       "()I", (void*)android_os_Process_myUid},
878    {"getUidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName},
879    {"getGidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName},
880    {"setThreadPriority",   "(II)V", (void*)android_os_Process_setThreadPriority},
881    {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground},
882    {"setThreadPriority",   "(I)V", (void*)android_os_Process_setCallingThreadPriority},
883    {"getThreadPriority",   "(I)I", (void*)android_os_Process_getThreadPriority},
884    {"setThreadGroup",      "(II)V", (void*)android_os_Process_setThreadGroup},
885    {"setProcessGroup",      "(II)V", (void*)android_os_Process_setProcessGroup},
886    {"setOomAdj",   "(II)Z", (void*)android_os_Process_setOomAdj},
887    {"setArgV0",    "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0},
888    {"setUid", "(I)I", (void*)android_os_Process_setUid},
889    {"setGid", "(I)I", (void*)android_os_Process_setGid},
890    {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal},
891    {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet},
892    {"supportsProcesses", "()Z", (void*)android_os_Process_supportsProcesses},
893    {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory},
894    {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines},
895    {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids},
896    {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile},
897    {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine},
898    {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime},
899    {"getPss", "(I)J", (void*)android_os_Process_getPss},
900    //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject},
901};
902
903const char* const kProcessPathName = "android/os/Process";
904
905int register_android_os_Process(JNIEnv* env)
906{
907    return AndroidRuntime::registerNativeMethods(
908        env, kProcessPathName,
909        methods, NELEM(methods));
910}
911