android_util_Process.cpp revision 9e57c414f39e1a31349bc215635fdcfaf1902cee
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 <cutils/sched_policy.h>
25#include <utils/String8.h>
26#include <utils/Vector.h>
27
28#include <android_runtime/AndroidRuntime.h>
29
30#include "android_util_Binder.h"
31#include "JNIHelp.h"
32
33#include <sys/errno.h>
34#include <sys/resource.h>
35#include <sys/types.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
53// For both of these, err should be in the errno range (positive), not a status_t (negative)
54
55static void signalExceptionForPriorityError(JNIEnv* env, int err)
56{
57    switch (err) {
58        case EINVAL:
59            jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
60            break;
61        case ESRCH:
62            jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist");
63            break;
64        case EPERM:
65            jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread");
66            break;
67        case EACCES:
68            jniThrowException(env, "java/lang/SecurityException", "No permission to set to given priority");
69            break;
70        default:
71            jniThrowException(env, "java/lang/RuntimeException", "Unknown error");
72            break;
73    }
74}
75
76static void signalExceptionForGroupError(JNIEnv* env, int err)
77{
78    switch (err) {
79        case EINVAL:
80            jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
81            break;
82        case ESRCH:
83            jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist");
84            break;
85        case EPERM:
86            jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread");
87            break;
88        case EACCES:
89            jniThrowException(env, "java/lang/SecurityException", "No permission to set to given group");
90            break;
91        default:
92            jniThrowException(env, "java/lang/RuntimeException", "Unknown error");
93            break;
94    }
95}
96
97jint android_os_Process_myPid(JNIEnv* env, jobject clazz)
98{
99    return getpid();
100}
101
102jint android_os_Process_myUid(JNIEnv* env, jobject clazz)
103{
104    return getuid();
105}
106
107jint android_os_Process_myTid(JNIEnv* env, jobject clazz)
108{
109    return androidGetTid();
110}
111
112jint android_os_Process_getUidForName(JNIEnv* env, jobject clazz, jstring name)
113{
114    if (name == NULL) {
115        jniThrowNullPointerException(env, NULL);
116        return -1;
117    }
118
119    const jchar* str16 = env->GetStringCritical(name, 0);
120    String8 name8;
121    if (str16) {
122        name8 = String8(str16, env->GetStringLength(name));
123        env->ReleaseStringCritical(name, str16);
124    }
125
126    const size_t N = name8.size();
127    if (N > 0) {
128        const char* str = name8.string();
129        for (size_t i=0; i<N; i++) {
130            if (str[i] < '0' || str[i] > '9') {
131                struct passwd* pwd = getpwnam(str);
132                if (pwd == NULL) {
133                    return -1;
134                }
135                return pwd->pw_uid;
136            }
137        }
138        return atoi(str);
139    }
140    return -1;
141}
142
143jint android_os_Process_getGidForName(JNIEnv* env, jobject clazz, jstring name)
144{
145    if (name == NULL) {
146        jniThrowNullPointerException(env, NULL);
147        return -1;
148    }
149
150    const jchar* str16 = env->GetStringCritical(name, 0);
151    String8 name8;
152    if (str16) {
153        name8 = String8(str16, env->GetStringLength(name));
154        env->ReleaseStringCritical(name, str16);
155    }
156
157    const size_t N = name8.size();
158    if (N > 0) {
159        const char* str = name8.string();
160        for (size_t i=0; i<N; i++) {
161            if (str[i] < '0' || str[i] > '9') {
162                struct group* grp = getgrnam(str);
163                if (grp == NULL) {
164                    return -1;
165                }
166                return grp->gr_gid;
167            }
168        }
169        return atoi(str);
170    }
171    return -1;
172}
173
174void android_os_Process_setThreadGroup(JNIEnv* env, jobject clazz, int tid, jint grp)
175{
176    ALOGV("%s tid=%d grp=%d", __func__, tid, grp);
177    SchedPolicy sp = (SchedPolicy) grp;
178    int res = set_sched_policy(tid, sp);
179    if (res != NO_ERROR) {
180        signalExceptionForGroupError(env, -res);
181    }
182}
183
184void android_os_Process_setProcessGroup(JNIEnv* env, jobject clazz, int pid, jint grp)
185{
186    ALOGV("%s pid=%d grp=%d", __func__, pid, grp);
187    DIR *d;
188    FILE *fp;
189    char proc_path[255];
190    struct dirent *de;
191
192    if ((grp == SP_FOREGROUND) || (grp > SP_MAX)) {
193        signalExceptionForGroupError(env, EINVAL);
194        return;
195    }
196
197    bool isDefault = false;
198    if (grp < 0) {
199        grp = SP_FOREGROUND;
200        isDefault = true;
201    }
202    SchedPolicy sp = (SchedPolicy) grp;
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 (sp == SP_BACKGROUND) {
219        ALOGD("setProcessGroup: vvv pid %d (%s)", pid, cmdline);
220    } else {
221        ALOGD("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, 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            ALOGE("Error getting pid for '%s'\n", de->d_name);
242            continue;
243        }
244
245        t_pri = getpriority(PRIO_PROCESS, t_pid);
246
247        if (t_pri <= ANDROID_PRIORITY_AUDIO) {
248            int scheduler = sched_getscheduler(t_pid);
249            if ((scheduler == SCHED_FIFO) || (scheduler == SCHED_RR)) {
250                // This task wants to stay in it's current audio group so it can keep it's budget
251                continue;
252            }
253        }
254
255        if (isDefault) {
256            if (t_pri >= ANDROID_PRIORITY_BACKGROUND) {
257                // This task wants to stay at background
258                continue;
259            }
260        }
261
262        int err = set_sched_policy(t_pid, sp);
263        if (err != NO_ERROR) {
264            signalExceptionForGroupError(env, -err);
265            break;
266        }
267    }
268    closedir(d);
269}
270
271jint android_os_Process_getProcessGroup(JNIEnv* env, jobject clazz, jint pid)
272{
273    SchedPolicy sp;
274    if (get_sched_policy(pid, &sp) != 0) {
275        signalExceptionForGroupError(env, errno);
276    }
277    return (int) sp;
278}
279
280static void android_os_Process_setCanSelfBackground(JNIEnv* env, jobject clazz, jboolean bgOk) {
281    // Establishes the calling thread as illegal to put into the background.
282    // Typically used only for the system process's main looper.
283#if GUARD_THREAD_PRIORITY
284    ALOGV("Process.setCanSelfBackground(%d) : tid=%d", bgOk, androidGetTid());
285    {
286        Mutex::Autolock _l(gKeyCreateMutex);
287        if (gBgKey == -1) {
288            pthread_key_create(&gBgKey, NULL);
289        }
290    }
291
292    // inverted:  not-okay, we set a sentinel value
293    pthread_setspecific(gBgKey, (void*)(bgOk ? 0 : 0xbaad));
294#endif
295}
296
297void android_os_Process_setThreadScheduler(JNIEnv* env, jclass clazz,
298                                              jint tid, jint policy, jint pri)
299{
300#ifdef HAVE_SCHED_SETSCHEDULER
301    struct sched_param param;
302    param.sched_priority = pri;
303    int rc = sched_setscheduler(tid, policy, &param);
304    if (rc) {
305        signalExceptionForPriorityError(env, errno);
306    }
307#else
308    signalExceptionForPriorityError(env, ENOSYS);
309#endif
310}
311
312void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz,
313                                              jint pid, jint pri)
314{
315#if GUARD_THREAD_PRIORITY
316    // if we're putting the current thread into the background, check the TLS
317    // to make sure this thread isn't guarded.  If it is, raise an exception.
318    if (pri >= ANDROID_PRIORITY_BACKGROUND) {
319        if (pid == androidGetTid()) {
320            void* bgOk = pthread_getspecific(gBgKey);
321            if (bgOk == ((void*)0xbaad)) {
322                ALOGE("Thread marked fg-only put self in background!");
323                jniThrowException(env, "java/lang/SecurityException", "May not put this thread into background");
324                return;
325            }
326        }
327    }
328#endif
329
330    int rc = androidSetThreadPriority(pid, pri);
331    if (rc != 0) {
332        if (rc == INVALID_OPERATION) {
333            signalExceptionForPriorityError(env, errno);
334        } else {
335            signalExceptionForGroupError(env, errno);
336        }
337    }
338
339    //ALOGI("Setting priority of %d: %d, getpriority returns %d\n",
340    //     pid, pri, getpriority(PRIO_PROCESS, pid));
341}
342
343void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz,
344                                                        jint pri)
345{
346    jint tid = android_os_Process_myTid(env, clazz);
347    android_os_Process_setThreadPriority(env, clazz, tid, pri);
348}
349
350jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz,
351                                              jint pid)
352{
353    errno = 0;
354    jint pri = getpriority(PRIO_PROCESS, pid);
355    if (errno != 0) {
356        signalExceptionForPriorityError(env, errno);
357    }
358    //ALOGI("Returning priority of %d: %d\n", pid, pri);
359    return pri;
360}
361
362jboolean android_os_Process_setOomAdj(JNIEnv* env, jobject clazz,
363                                      jint pid, jint adj)
364{
365#ifdef HAVE_OOM_ADJ
366    char text[64];
367    sprintf(text, "/proc/%d/oom_adj", pid);
368    int fd = open(text, O_WRONLY);
369    if (fd >= 0) {
370        sprintf(text, "%d", adj);
371        write(fd, text, strlen(text));
372        close(fd);
373    }
374    return true;
375#endif
376    return false;
377}
378
379void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name)
380{
381    if (name == NULL) {
382        jniThrowNullPointerException(env, NULL);
383        return;
384    }
385
386    const jchar* str = env->GetStringCritical(name, 0);
387    String8 name8;
388    if (str) {
389        name8 = String8(str, env->GetStringLength(name));
390        env->ReleaseStringCritical(name, str);
391    }
392
393    if (name8.size() > 0) {
394        ProcessState::self()->setArgV0(name8.string());
395    }
396}
397
398jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid)
399{
400    return setuid(uid) == 0 ? 0 : errno;
401}
402
403jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid)
404{
405    return setgid(uid) == 0 ? 0 : errno;
406}
407
408static int pid_compare(const void* v1, const void* v2)
409{
410    //ALOGI("Compare %d vs %d\n", *((const jint*)v1), *((const jint*)v2));
411    return *((const jint*)v1) - *((const jint*)v2);
412}
413
414static jlong getFreeMemoryImpl(const char* const sums[], const int sumsLen[], int num)
415{
416    int fd = open("/proc/meminfo", O_RDONLY);
417
418    if (fd < 0) {
419        ALOGW("Unable to open /proc/meminfo");
420        return -1;
421    }
422
423    char buffer[256];
424    const int len = read(fd, buffer, sizeof(buffer)-1);
425    close(fd);
426
427    if (len < 0) {
428        ALOGW("Unable to read /proc/meminfo");
429        return -1;
430    }
431    buffer[len] = 0;
432
433    int numFound = 0;
434    jlong mem = 0;
435
436    char* p = buffer;
437    while (*p && numFound < num) {
438        int i = 0;
439        while (sums[i]) {
440            if (strncmp(p, sums[i], sumsLen[i]) == 0) {
441                p += sumsLen[i];
442                while (*p == ' ') p++;
443                char* num = p;
444                while (*p >= '0' && *p <= '9') p++;
445                if (*p != 0) {
446                    *p = 0;
447                    p++;
448                    if (*p == 0) p--;
449                }
450                mem += atoll(num) * 1024;
451                numFound++;
452                break;
453            }
454            i++;
455        }
456        p++;
457    }
458
459    return numFound > 0 ? mem : -1;
460}
461
462static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz)
463{
464    static const char* const sums[] = { "MemFree:", "Cached:", NULL };
465    static const int sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), 0 };
466    return getFreeMemoryImpl(sums, sumsLen, 2);
467}
468
469static jlong android_os_Process_getTotalMemory(JNIEnv* env, jobject clazz)
470{
471    static const char* const sums[] = { "MemTotal:", NULL };
472    static const int sumsLen[] = { strlen("MemTotal:"), 0 };
473    return getFreeMemoryImpl(sums, sumsLen, 1);
474}
475
476void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr,
477                                      jobjectArray reqFields, jlongArray outFields)
478{
479    //ALOGI("getMemInfo: %p %p", reqFields, outFields);
480
481    if (fileStr == NULL || reqFields == NULL || outFields == NULL) {
482        jniThrowNullPointerException(env, NULL);
483        return;
484    }
485
486    const char* file8 = env->GetStringUTFChars(fileStr, NULL);
487    if (file8 == NULL) {
488        return;
489    }
490    String8 file(file8);
491    env->ReleaseStringUTFChars(fileStr, file8);
492
493    jsize count = env->GetArrayLength(reqFields);
494    if (count > env->GetArrayLength(outFields)) {
495        jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ");
496        return;
497    }
498
499    Vector<String8> fields;
500    int i;
501
502    for (i=0; i<count; i++) {
503        jobject obj = env->GetObjectArrayElement(reqFields, i);
504        if (obj != NULL) {
505            const char* str8 = env->GetStringUTFChars((jstring)obj, NULL);
506            //ALOGI("String at %d: %p = %s", i, obj, str8);
507            if (str8 == NULL) {
508                jniThrowNullPointerException(env, "Element in reqFields");
509                return;
510            }
511            fields.add(String8(str8));
512            env->ReleaseStringUTFChars((jstring)obj, str8);
513        } else {
514            jniThrowNullPointerException(env, "Element in reqFields");
515            return;
516        }
517    }
518
519    jlong* sizesArray = env->GetLongArrayElements(outFields, 0);
520    if (sizesArray == NULL) {
521        return;
522    }
523
524    //ALOGI("Clearing %d sizes", count);
525    for (i=0; i<count; i++) {
526        sizesArray[i] = 0;
527    }
528
529    int fd = open(file.string(), O_RDONLY);
530
531    if (fd >= 0) {
532        const size_t BUFFER_SIZE = 2048;
533        char* buffer = (char*)malloc(BUFFER_SIZE);
534        int len = read(fd, buffer, BUFFER_SIZE-1);
535        close(fd);
536
537        if (len < 0) {
538            ALOGW("Unable to read %s", file.string());
539            len = 0;
540        }
541        buffer[len] = 0;
542
543        int foundCount = 0;
544
545        char* p = buffer;
546        while (*p && foundCount < count) {
547            bool skipToEol = true;
548            //ALOGI("Parsing at: %s", p);
549            for (i=0; i<count; i++) {
550                const String8& field = fields[i];
551                if (strncmp(p, field.string(), field.length()) == 0) {
552                    p += field.length();
553                    while (*p == ' ' || *p == '\t') p++;
554                    char* num = p;
555                    while (*p >= '0' && *p <= '9') p++;
556                    skipToEol = *p != '\n';
557                    if (*p != 0) {
558                        *p = 0;
559                        p++;
560                    }
561                    char* end;
562                    sizesArray[i] = strtoll(num, &end, 10);
563                    //ALOGI("Field %s = %d", field.string(), sizesArray[i]);
564                    foundCount++;
565                    break;
566                }
567            }
568            if (skipToEol) {
569                while (*p && *p != '\n') {
570                    p++;
571                }
572                if (*p == '\n') {
573                    p++;
574                }
575            }
576        }
577
578        free(buffer);
579    } else {
580        ALOGW("Unable to open %s", file.string());
581    }
582
583    //ALOGI("Done!");
584    env->ReleaseLongArrayElements(outFields, sizesArray, 0);
585}
586
587jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz,
588                                     jstring file, jintArray lastArray)
589{
590    if (file == NULL) {
591        jniThrowNullPointerException(env, NULL);
592        return NULL;
593    }
594
595    const char* file8 = env->GetStringUTFChars(file, NULL);
596    if (file8 == NULL) {
597        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
598        return NULL;
599    }
600
601    DIR* dirp = opendir(file8);
602
603    env->ReleaseStringUTFChars(file, file8);
604
605    if(dirp == NULL) {
606        return NULL;
607    }
608
609    jsize curCount = 0;
610    jint* curData = NULL;
611    if (lastArray != NULL) {
612        curCount = env->GetArrayLength(lastArray);
613        curData = env->GetIntArrayElements(lastArray, 0);
614    }
615
616    jint curPos = 0;
617
618    struct dirent* entry;
619    while ((entry=readdir(dirp)) != NULL) {
620        const char* p = entry->d_name;
621        while (*p) {
622            if (*p < '0' || *p > '9') break;
623            p++;
624        }
625        if (*p != 0) continue;
626
627        char* end;
628        int pid = strtol(entry->d_name, &end, 10);
629        //ALOGI("File %s pid=%d\n", entry->d_name, pid);
630        if (curPos >= curCount) {
631            jsize newCount = (curCount == 0) ? 10 : (curCount*2);
632            jintArray newArray = env->NewIntArray(newCount);
633            if (newArray == NULL) {
634                closedir(dirp);
635                jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
636                return NULL;
637            }
638            jint* newData = env->GetIntArrayElements(newArray, 0);
639            if (curData != NULL) {
640                memcpy(newData, curData, sizeof(jint)*curCount);
641                env->ReleaseIntArrayElements(lastArray, curData, 0);
642            }
643            lastArray = newArray;
644            curCount = newCount;
645            curData = newData;
646        }
647
648        curData[curPos] = pid;
649        curPos++;
650    }
651
652    closedir(dirp);
653
654    if (curData != NULL && curPos > 0) {
655        qsort(curData, curPos, sizeof(jint), pid_compare);
656    }
657
658    while (curPos < curCount) {
659        curData[curPos] = -1;
660        curPos++;
661    }
662
663    if (curData != NULL) {
664        env->ReleaseIntArrayElements(lastArray, curData, 0);
665    }
666
667    return lastArray;
668}
669
670enum {
671    PROC_TERM_MASK = 0xff,
672    PROC_ZERO_TERM = 0,
673    PROC_SPACE_TERM = ' ',
674    PROC_COMBINE = 0x100,
675    PROC_PARENS = 0x200,
676    PROC_OUT_STRING = 0x1000,
677    PROC_OUT_LONG = 0x2000,
678    PROC_OUT_FLOAT = 0x4000,
679};
680
681jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz,
682        char* buffer, jint startIndex, jint endIndex, jintArray format,
683        jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
684{
685
686    const jsize NF = env->GetArrayLength(format);
687    const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0;
688    const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0;
689    const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0;
690
691    jint* formatData = env->GetIntArrayElements(format, 0);
692    jlong* longsData = outLongs ?
693        env->GetLongArrayElements(outLongs, 0) : NULL;
694    jfloat* floatsData = outFloats ?
695        env->GetFloatArrayElements(outFloats, 0) : NULL;
696    if (formatData == NULL || (NL > 0 && longsData == NULL)
697            || (NR > 0 && floatsData == NULL)) {
698        if (formatData != NULL) {
699            env->ReleaseIntArrayElements(format, formatData, 0);
700        }
701        if (longsData != NULL) {
702            env->ReleaseLongArrayElements(outLongs, longsData, 0);
703        }
704        if (floatsData != NULL) {
705            env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
706        }
707        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
708        return JNI_FALSE;
709    }
710
711    jsize i = startIndex;
712    jsize di = 0;
713
714    jboolean res = JNI_TRUE;
715
716    for (jsize fi=0; fi<NF; fi++) {
717        const jint mode = formatData[fi];
718        if ((mode&PROC_PARENS) != 0) {
719            i++;
720        }
721        const char term = (char)(mode&PROC_TERM_MASK);
722        const jsize start = i;
723        if (i >= endIndex) {
724            res = JNI_FALSE;
725            break;
726        }
727
728        jsize end = -1;
729        if ((mode&PROC_PARENS) != 0) {
730            while (buffer[i] != ')' && i < endIndex) {
731                i++;
732            }
733            end = i;
734            i++;
735        }
736        while (buffer[i] != term && i < endIndex) {
737            i++;
738        }
739        if (end < 0) {
740            end = i;
741        }
742
743        if (i < endIndex) {
744            i++;
745            if ((mode&PROC_COMBINE) != 0) {
746                while (buffer[i] == term && i < endIndex) {
747                    i++;
748                }
749            }
750        }
751
752        //ALOGI("Field %d: %d-%d dest=%d mode=0x%x\n", i, start, end, di, mode);
753
754        if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) {
755            char c = buffer[end];
756            buffer[end] = 0;
757            if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) {
758                char* end;
759                floatsData[di] = strtof(buffer+start, &end);
760            }
761            if ((mode&PROC_OUT_LONG) != 0 && di < NL) {
762                char* end;
763                longsData[di] = strtoll(buffer+start, &end, 10);
764            }
765            if ((mode&PROC_OUT_STRING) != 0 && di < NS) {
766                jstring str = env->NewStringUTF(buffer+start);
767                env->SetObjectArrayElement(outStrings, di, str);
768            }
769            buffer[end] = c;
770            di++;
771        }
772    }
773
774    env->ReleaseIntArrayElements(format, formatData, 0);
775    if (longsData != NULL) {
776        env->ReleaseLongArrayElements(outLongs, longsData, 0);
777    }
778    if (floatsData != NULL) {
779        env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
780    }
781
782    return res;
783}
784
785jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz,
786        jbyteArray buffer, jint startIndex, jint endIndex, jintArray format,
787        jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
788{
789        jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL);
790
791        jboolean result = android_os_Process_parseProcLineArray(env, clazz,
792                (char*) bufferArray, startIndex, endIndex, format, outStrings,
793                outLongs, outFloats);
794
795        env->ReleaseByteArrayElements(buffer, bufferArray, 0);
796
797        return result;
798}
799
800jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz,
801        jstring file, jintArray format, jobjectArray outStrings,
802        jlongArray outLongs, jfloatArray outFloats)
803{
804    if (file == NULL || format == NULL) {
805        jniThrowNullPointerException(env, NULL);
806        return JNI_FALSE;
807    }
808
809    const char* file8 = env->GetStringUTFChars(file, NULL);
810    if (file8 == NULL) {
811        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
812        return JNI_FALSE;
813    }
814    int fd = open(file8, O_RDONLY);
815    env->ReleaseStringUTFChars(file, file8);
816
817    if (fd < 0) {
818        //ALOGW("Unable to open process file: %s\n", file8);
819        return JNI_FALSE;
820    }
821
822    char buffer[256];
823    const int len = read(fd, buffer, sizeof(buffer)-1);
824    close(fd);
825
826    if (len < 0) {
827        //ALOGW("Unable to open process file: %s fd=%d\n", file8, fd);
828        return JNI_FALSE;
829    }
830    buffer[len] = 0;
831
832    return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len,
833            format, outStrings, outLongs, outFloats);
834
835}
836
837void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz,
838                                             jobject binderObject)
839{
840    if (binderObject == NULL) {
841        jniThrowNullPointerException(env, NULL);
842        return;
843    }
844
845    sp<IBinder> binder = ibinderForJavaObject(env, binderObject);
846}
847
848void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig)
849{
850    if (pid > 0) {
851        ALOGI("Sending signal. PID: %d SIG: %d", pid, sig);
852        kill(pid, sig);
853    }
854}
855
856void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig)
857{
858    if (pid > 0) {
859        kill(pid, sig);
860    }
861}
862
863static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz)
864{
865    struct timespec ts;
866
867    int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
868
869    if (res != 0) {
870        return (jlong) 0;
871    }
872
873    nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
874    return (jlong) nanoseconds_to_milliseconds(when);
875}
876
877static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid)
878{
879    char filename[64];
880
881    snprintf(filename, sizeof(filename), "/proc/%d/smaps", pid);
882
883    FILE * file = fopen(filename, "r");
884    if (!file) {
885        return (jlong) -1;
886    }
887
888    // Tally up all of the Pss from the various maps
889    char line[256];
890    jlong pss = 0;
891    while (fgets(line, sizeof(line), file)) {
892        jlong v;
893        if (sscanf(line, "Pss: %lld kB", &v) == 1) {
894            pss += v;
895        }
896    }
897
898    fclose(file);
899
900    // Return the Pss value in bytes, not kilobytes
901    return pss * 1024;
902}
903
904jintArray android_os_Process_getPidsForCommands(JNIEnv* env, jobject clazz,
905        jobjectArray commandNames)
906{
907    if (commandNames == NULL) {
908        jniThrowNullPointerException(env, NULL);
909        return NULL;
910    }
911
912    Vector<String8> commands;
913
914    jsize count = env->GetArrayLength(commandNames);
915
916    for (int i=0; i<count; i++) {
917        jobject obj = env->GetObjectArrayElement(commandNames, i);
918        if (obj != NULL) {
919            const char* str8 = env->GetStringUTFChars((jstring)obj, NULL);
920            if (str8 == NULL) {
921                jniThrowNullPointerException(env, "Element in commandNames");
922                return NULL;
923            }
924            commands.add(String8(str8));
925            env->ReleaseStringUTFChars((jstring)obj, str8);
926        } else {
927            jniThrowNullPointerException(env, "Element in commandNames");
928            return NULL;
929        }
930    }
931
932    Vector<jint> pids;
933
934    DIR *proc = opendir("/proc");
935    if (proc == NULL) {
936        fprintf(stderr, "/proc: %s\n", strerror(errno));
937        return NULL;
938    }
939
940    struct dirent *d;
941    while ((d = readdir(proc))) {
942        int pid = atoi(d->d_name);
943        if (pid <= 0) continue;
944
945        char path[PATH_MAX];
946        char data[PATH_MAX];
947        snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
948
949        int fd = open(path, O_RDONLY);
950        if (fd < 0) {
951            continue;
952        }
953        const int len = read(fd, data, sizeof(data)-1);
954        close(fd);
955
956        if (len < 0) {
957            continue;
958        }
959        data[len] = 0;
960
961        for (int i=0; i<len; i++) {
962            if (data[i] == ' ') {
963                data[i] = 0;
964                break;
965            }
966        }
967
968        for (size_t i=0; i<commands.size(); i++) {
969            if (commands[i] == data) {
970                pids.add(pid);
971                break;
972            }
973        }
974    }
975
976    closedir(proc);
977
978    jintArray pidArray = env->NewIntArray(pids.size());
979    if (pidArray == NULL) {
980        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
981        return NULL;
982    }
983
984    if (pids.size() > 0) {
985        env->SetIntArrayRegion(pidArray, 0, pids.size(), pids.array());
986    }
987
988    return pidArray;
989}
990
991static const JNINativeMethod methods[] = {
992    {"myPid",       "()I", (void*)android_os_Process_myPid},
993    {"myTid",       "()I", (void*)android_os_Process_myTid},
994    {"myUid",       "()I", (void*)android_os_Process_myUid},
995    {"getUidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName},
996    {"getGidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName},
997    {"setThreadPriority",   "(II)V", (void*)android_os_Process_setThreadPriority},
998    {"setThreadScheduler",  "(III)V", (void*)android_os_Process_setThreadScheduler},
999    {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground},
1000    {"setThreadPriority",   "(I)V", (void*)android_os_Process_setCallingThreadPriority},
1001    {"getThreadPriority",   "(I)I", (void*)android_os_Process_getThreadPriority},
1002    {"setThreadGroup",      "(II)V", (void*)android_os_Process_setThreadGroup},
1003    {"setProcessGroup",     "(II)V", (void*)android_os_Process_setProcessGroup},
1004    {"getProcessGroup",     "(I)I", (void*)android_os_Process_getProcessGroup},
1005    {"setOomAdj",   "(II)Z", (void*)android_os_Process_setOomAdj},
1006    {"setArgV0",    "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0},
1007    {"setUid", "(I)I", (void*)android_os_Process_setUid},
1008    {"setGid", "(I)I", (void*)android_os_Process_setGid},
1009    {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal},
1010    {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet},
1011    {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory},
1012    {"getTotalMemory", "()J", (void*)android_os_Process_getTotalMemory},
1013    {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines},
1014    {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids},
1015    {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile},
1016    {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine},
1017    {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime},
1018    {"getPss", "(I)J", (void*)android_os_Process_getPss},
1019    {"getPidsForCommands", "([Ljava/lang/String;)[I", (void*)android_os_Process_getPidsForCommands},
1020    //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject},
1021};
1022
1023const char* const kProcessPathName = "android/os/Process";
1024
1025int register_android_os_Process(JNIEnv* env)
1026{
1027    return AndroidRuntime::registerNativeMethods(
1028        env, kProcessPathName,
1029        methods, NELEM(methods));
1030}
1031