android_util_Process.cpp revision 6698749dd4d4d6513b26aa9071af290b956b68a7
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/IServiceManager.h>
23#include <cutils/process_name.h>
24#include <cutils/sched_policy.h>
25#include <utils/String8.h>
26#include <utils/Vector.h>
27#include <processgroup/processgroup.h>
28
29#include <android_runtime/AndroidRuntime.h>
30
31#include "android_util_Binder.h"
32#include "JNIHelp.h"
33
34#include <dirent.h>
35#include <fcntl.h>
36#include <grp.h>
37#include <inttypes.h>
38#include <pwd.h>
39#include <signal.h>
40#include <sys/errno.h>
41#include <sys/resource.h>
42#include <sys/stat.h>
43#include <sys/types.h>
44#include <unistd.h>
45
46#define GUARD_THREAD_PRIORITY 0
47
48using namespace android;
49
50static const bool kDebugPolicy = false;
51static const bool kDebugProc = false;
52
53#if GUARD_THREAD_PRIORITY
54Mutex gKeyCreateMutex;
55static pthread_key_t gBgKey = -1;
56#endif
57
58// For both of these, err should be in the errno range (positive), not a status_t (negative)
59
60static void signalExceptionForPriorityError(JNIEnv* env, int err)
61{
62    switch (err) {
63        case EINVAL:
64            jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
65            break;
66        case ESRCH:
67            jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist");
68            break;
69        case EPERM:
70            jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread");
71            break;
72        case EACCES:
73            jniThrowException(env, "java/lang/SecurityException", "No permission to set to given priority");
74            break;
75        default:
76            jniThrowException(env, "java/lang/RuntimeException", "Unknown error");
77            break;
78    }
79}
80
81static void signalExceptionForGroupError(JNIEnv* env, int err)
82{
83    switch (err) {
84        case EINVAL:
85            jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
86            break;
87        case ESRCH:
88            jniThrowException(env, "java/lang/IllegalArgumentException", "Given thread does not exist");
89            break;
90        case EPERM:
91            jniThrowException(env, "java/lang/SecurityException", "No permission to modify given thread");
92            break;
93        case EACCES:
94            jniThrowException(env, "java/lang/SecurityException", "No permission to set to given group");
95            break;
96        default:
97            jniThrowException(env, "java/lang/RuntimeException", "Unknown error");
98            break;
99    }
100}
101
102jint android_os_Process_getUidForName(JNIEnv* env, jobject clazz, jstring name)
103{
104    if (name == NULL) {
105        jniThrowNullPointerException(env, NULL);
106        return -1;
107    }
108
109    const jchar* str16 = env->GetStringCritical(name, 0);
110    String8 name8;
111    if (str16) {
112        name8 = String8(reinterpret_cast<const char16_t*>(str16),
113                        env->GetStringLength(name));
114        env->ReleaseStringCritical(name, str16);
115    }
116
117    const size_t N = name8.size();
118    if (N > 0) {
119        const char* str = name8.string();
120        for (size_t i=0; i<N; i++) {
121            if (str[i] < '0' || str[i] > '9') {
122                struct passwd* pwd = getpwnam(str);
123                if (pwd == NULL) {
124                    return -1;
125                }
126                return pwd->pw_uid;
127            }
128        }
129        return atoi(str);
130    }
131    return -1;
132}
133
134jint android_os_Process_getGidForName(JNIEnv* env, jobject clazz, jstring name)
135{
136    if (name == NULL) {
137        jniThrowNullPointerException(env, NULL);
138        return -1;
139    }
140
141    const jchar* str16 = env->GetStringCritical(name, 0);
142    String8 name8;
143    if (str16) {
144        name8 = String8(reinterpret_cast<const char16_t*>(str16),
145                        env->GetStringLength(name));
146        env->ReleaseStringCritical(name, str16);
147    }
148
149    const size_t N = name8.size();
150    if (N > 0) {
151        const char* str = name8.string();
152        for (size_t i=0; i<N; i++) {
153            if (str[i] < '0' || str[i] > '9') {
154                struct group* grp = getgrnam(str);
155                if (grp == NULL) {
156                    return -1;
157                }
158                return grp->gr_gid;
159            }
160        }
161        return atoi(str);
162    }
163    return -1;
164}
165
166void android_os_Process_setThreadGroup(JNIEnv* env, jobject clazz, int tid, jint grp)
167{
168    ALOGV("%s tid=%d grp=%" PRId32, __func__, tid, grp);
169    SchedPolicy sp = (SchedPolicy) grp;
170    int res = set_sched_policy(tid, sp);
171    if (res != NO_ERROR) {
172        signalExceptionForGroupError(env, -res);
173    }
174}
175
176void android_os_Process_setProcessGroup(JNIEnv* env, jobject clazz, int pid, jint grp)
177{
178    ALOGV("%s pid=%d grp=%" PRId32, __func__, pid, grp);
179    DIR *d;
180    char proc_path[255];
181    struct dirent *de;
182
183    if ((grp == SP_FOREGROUND) || (grp > SP_MAX)) {
184        signalExceptionForGroupError(env, EINVAL);
185        return;
186    }
187
188    bool isDefault = false;
189    if (grp < 0) {
190        grp = SP_FOREGROUND;
191        isDefault = true;
192    }
193    SchedPolicy sp = (SchedPolicy) grp;
194
195    if (kDebugPolicy) {
196        char cmdline[32];
197        int fd;
198
199        strcpy(cmdline, "unknown");
200
201        sprintf(proc_path, "/proc/%d/cmdline", pid);
202        fd = open(proc_path, O_RDONLY);
203        if (fd >= 0) {
204            int rc = read(fd, cmdline, sizeof(cmdline)-1);
205            cmdline[rc] = 0;
206            close(fd);
207        }
208
209        if (sp == SP_BACKGROUND) {
210            ALOGD("setProcessGroup: vvv pid %d (%s)", pid, cmdline);
211        } else {
212            ALOGD("setProcessGroup: ^^^ pid %d (%s)", pid, cmdline);
213        }
214    }
215
216    sprintf(proc_path, "/proc/%d/task", pid);
217    if (!(d = opendir(proc_path))) {
218        // If the process exited on us, don't generate an exception
219        if (errno != ENOENT)
220            signalExceptionForGroupError(env, errno);
221        return;
222    }
223
224    while ((de = readdir(d))) {
225        int t_pid;
226        int t_pri;
227
228        if (de->d_name[0] == '.')
229            continue;
230        t_pid = atoi(de->d_name);
231
232        if (!t_pid) {
233            ALOGE("Error getting pid for '%s'\n", de->d_name);
234            continue;
235        }
236
237        t_pri = getpriority(PRIO_PROCESS, t_pid);
238
239        if (t_pri <= ANDROID_PRIORITY_AUDIO) {
240            int scheduler = sched_getscheduler(t_pid);
241            if ((scheduler == SCHED_FIFO) || (scheduler == SCHED_RR)) {
242                // This task wants to stay in it's current audio group so it can keep it's budget
243                continue;
244            }
245        }
246
247        if (isDefault) {
248            if (t_pri >= ANDROID_PRIORITY_BACKGROUND) {
249                // This task wants to stay at background
250                continue;
251            }
252        }
253
254        int err = set_sched_policy(t_pid, sp);
255        if (err != NO_ERROR) {
256            signalExceptionForGroupError(env, -err);
257            break;
258        }
259    }
260    closedir(d);
261}
262
263jint android_os_Process_getProcessGroup(JNIEnv* env, jobject clazz, jint pid)
264{
265    SchedPolicy sp;
266    if (get_sched_policy(pid, &sp) != 0) {
267        signalExceptionForGroupError(env, errno);
268    }
269    return (int) sp;
270}
271
272static void android_os_Process_setCanSelfBackground(JNIEnv* env, jobject clazz, jboolean bgOk) {
273    // Establishes the calling thread as illegal to put into the background.
274    // Typically used only for the system process's main looper.
275#if GUARD_THREAD_PRIORITY
276    ALOGV("Process.setCanSelfBackground(%d) : tid=%d", bgOk, gettid());
277    {
278        Mutex::Autolock _l(gKeyCreateMutex);
279        if (gBgKey == -1) {
280            pthread_key_create(&gBgKey, NULL);
281        }
282    }
283
284    // inverted:  not-okay, we set a sentinel value
285    pthread_setspecific(gBgKey, (void*)(bgOk ? 0 : 0xbaad));
286#endif
287}
288
289void android_os_Process_setThreadScheduler(JNIEnv* env, jclass clazz,
290                                              jint tid, jint policy, jint pri)
291{
292// linux has sched_setscheduler(), others don't.
293#if defined(__linux__)
294    struct sched_param param;
295    param.sched_priority = pri;
296    int rc = sched_setscheduler(tid, policy, &param);
297    if (rc) {
298        signalExceptionForPriorityError(env, errno);
299    }
300#else
301    signalExceptionForPriorityError(env, ENOSYS);
302#endif
303}
304
305void android_os_Process_setThreadPriority(JNIEnv* env, jobject clazz,
306                                              jint pid, jint pri)
307{
308#if GUARD_THREAD_PRIORITY
309    // if we're putting the current thread into the background, check the TLS
310    // to make sure this thread isn't guarded.  If it is, raise an exception.
311    if (pri >= ANDROID_PRIORITY_BACKGROUND) {
312        if (pid == gettid()) {
313            void* bgOk = pthread_getspecific(gBgKey);
314            if (bgOk == ((void*)0xbaad)) {
315                ALOGE("Thread marked fg-only put self in background!");
316                jniThrowException(env, "java/lang/SecurityException", "May not put this thread into background");
317                return;
318            }
319        }
320    }
321#endif
322
323    int rc = androidSetThreadPriority(pid, pri);
324    if (rc != 0) {
325        if (rc == INVALID_OPERATION) {
326            signalExceptionForPriorityError(env, errno);
327        } else {
328            signalExceptionForGroupError(env, errno);
329        }
330    }
331
332    //ALOGI("Setting priority of %" PRId32 ": %" PRId32 ", getpriority returns %d\n",
333    //     pid, pri, getpriority(PRIO_PROCESS, pid));
334}
335
336void android_os_Process_setCallingThreadPriority(JNIEnv* env, jobject clazz,
337                                                        jint pri)
338{
339    android_os_Process_setThreadPriority(env, clazz, gettid(), pri);
340}
341
342jint android_os_Process_getThreadPriority(JNIEnv* env, jobject clazz,
343                                              jint pid)
344{
345    errno = 0;
346    jint pri = getpriority(PRIO_PROCESS, pid);
347    if (errno != 0) {
348        signalExceptionForPriorityError(env, errno);
349    }
350    //ALOGI("Returning priority of %" PRId32 ": %" PRId32 "\n", pid, pri);
351    return pri;
352}
353
354jboolean android_os_Process_setSwappiness(JNIEnv *env, jobject clazz,
355                                          jint pid, jboolean is_increased)
356{
357    char text[64];
358
359    if (is_increased) {
360        strcpy(text, "/sys/fs/cgroup/memory/sw/tasks");
361    } else {
362        strcpy(text, "/sys/fs/cgroup/memory/tasks");
363    }
364
365    struct stat st;
366    if (stat(text, &st) || !S_ISREG(st.st_mode)) {
367        return false;
368    }
369
370    int fd = open(text, O_WRONLY);
371    if (fd >= 0) {
372        sprintf(text, "%" PRId32, pid);
373        write(fd, text, strlen(text));
374        close(fd);
375    }
376
377    return true;
378}
379
380void android_os_Process_setArgV0(JNIEnv* env, jobject clazz, jstring name)
381{
382    if (name == NULL) {
383        jniThrowNullPointerException(env, NULL);
384        return;
385    }
386
387    const jchar* str = env->GetStringCritical(name, 0);
388    String8 name8;
389    if (str) {
390        name8 = String8(reinterpret_cast<const char16_t*>(str),
391                        env->GetStringLength(name));
392        env->ReleaseStringCritical(name, str);
393    }
394
395    if (name8.size() > 0) {
396        const char* procName = name8.string();
397        set_process_name(procName);
398        AndroidRuntime::getRuntime()->setArgv0(procName);
399    }
400}
401
402jint android_os_Process_setUid(JNIEnv* env, jobject clazz, jint uid)
403{
404    return setuid(uid) == 0 ? 0 : errno;
405}
406
407jint android_os_Process_setGid(JNIEnv* env, jobject clazz, jint uid)
408{
409    return setgid(uid) == 0 ? 0 : errno;
410}
411
412static int pid_compare(const void* v1, const void* v2)
413{
414    //ALOGI("Compare %" PRId32 " vs %" PRId32 "\n", *((const jint*)v1), *((const jint*)v2));
415    return *((const jint*)v1) - *((const jint*)v2);
416}
417
418static jlong getFreeMemoryImpl(const char* const sums[], const size_t sumsLen[], size_t num)
419{
420    int fd = open("/proc/meminfo", O_RDONLY);
421
422    if (fd < 0) {
423        ALOGW("Unable to open /proc/meminfo");
424        return -1;
425    }
426
427    char buffer[256];
428    const int len = read(fd, buffer, sizeof(buffer)-1);
429    close(fd);
430
431    if (len < 0) {
432        ALOGW("Unable to read /proc/meminfo");
433        return -1;
434    }
435    buffer[len] = 0;
436
437    size_t numFound = 0;
438    jlong mem = 0;
439
440    char* p = buffer;
441    while (*p && numFound < num) {
442        int i = 0;
443        while (sums[i]) {
444            if (strncmp(p, sums[i], sumsLen[i]) == 0) {
445                p += sumsLen[i];
446                while (*p == ' ') p++;
447                char* num = p;
448                while (*p >= '0' && *p <= '9') p++;
449                if (*p != 0) {
450                    *p = 0;
451                    p++;
452                    if (*p == 0) p--;
453                }
454                mem += atoll(num) * 1024;
455                numFound++;
456                break;
457            }
458            i++;
459        }
460        p++;
461    }
462
463    return numFound > 0 ? mem : -1;
464}
465
466static jlong android_os_Process_getFreeMemory(JNIEnv* env, jobject clazz)
467{
468    static const char* const sums[] = { "MemFree:", "Cached:", NULL };
469    static const size_t sumsLen[] = { strlen("MemFree:"), strlen("Cached:"), 0 };
470    return getFreeMemoryImpl(sums, sumsLen, 2);
471}
472
473static jlong android_os_Process_getTotalMemory(JNIEnv* env, jobject clazz)
474{
475    static const char* const sums[] = { "MemTotal:", NULL };
476    static const size_t sumsLen[] = { strlen("MemTotal:"), 0 };
477    return getFreeMemoryImpl(sums, sumsLen, 1);
478}
479
480void android_os_Process_readProcLines(JNIEnv* env, jobject clazz, jstring fileStr,
481                                      jobjectArray reqFields, jlongArray outFields)
482{
483    //ALOGI("getMemInfo: %p %p", reqFields, outFields);
484
485    if (fileStr == NULL || reqFields == NULL || outFields == NULL) {
486        jniThrowNullPointerException(env, NULL);
487        return;
488    }
489
490    const char* file8 = env->GetStringUTFChars(fileStr, NULL);
491    if (file8 == NULL) {
492        return;
493    }
494    String8 file(file8);
495    env->ReleaseStringUTFChars(fileStr, file8);
496
497    jsize count = env->GetArrayLength(reqFields);
498    if (count > env->GetArrayLength(outFields)) {
499        jniThrowException(env, "java/lang/IllegalArgumentException", "Array lengths differ");
500        return;
501    }
502
503    Vector<String8> fields;
504    int i;
505
506    for (i=0; i<count; i++) {
507        jobject obj = env->GetObjectArrayElement(reqFields, i);
508        if (obj != NULL) {
509            const char* str8 = env->GetStringUTFChars((jstring)obj, NULL);
510            //ALOGI("String at %d: %p = %s", i, obj, str8);
511            if (str8 == NULL) {
512                jniThrowNullPointerException(env, "Element in reqFields");
513                return;
514            }
515            fields.add(String8(str8));
516            env->ReleaseStringUTFChars((jstring)obj, str8);
517        } else {
518            jniThrowNullPointerException(env, "Element in reqFields");
519            return;
520        }
521    }
522
523    jlong* sizesArray = env->GetLongArrayElements(outFields, 0);
524    if (sizesArray == NULL) {
525        return;
526    }
527
528    //ALOGI("Clearing %" PRId32 " sizes", count);
529    for (i=0; i<count; i++) {
530        sizesArray[i] = 0;
531    }
532
533    int fd = open(file.string(), O_RDONLY);
534
535    if (fd >= 0) {
536        const size_t BUFFER_SIZE = 2048;
537        char* buffer = (char*)malloc(BUFFER_SIZE);
538        int len = read(fd, buffer, BUFFER_SIZE-1);
539        close(fd);
540
541        if (len < 0) {
542            ALOGW("Unable to read %s", file.string());
543            len = 0;
544        }
545        buffer[len] = 0;
546
547        int foundCount = 0;
548
549        char* p = buffer;
550        while (*p && foundCount < count) {
551            bool skipToEol = true;
552            //ALOGI("Parsing at: %s", p);
553            for (i=0; i<count; i++) {
554                const String8& field = fields[i];
555                if (strncmp(p, field.string(), field.length()) == 0) {
556                    p += field.length();
557                    while (*p == ' ' || *p == '\t') p++;
558                    char* num = p;
559                    while (*p >= '0' && *p <= '9') p++;
560                    skipToEol = *p != '\n';
561                    if (*p != 0) {
562                        *p = 0;
563                        p++;
564                    }
565                    char* end;
566                    sizesArray[i] = strtoll(num, &end, 10);
567                    //ALOGI("Field %s = %" PRId64, field.string(), sizesArray[i]);
568                    foundCount++;
569                    break;
570                }
571            }
572            if (skipToEol) {
573                while (*p && *p != '\n') {
574                    p++;
575                }
576                if (*p == '\n') {
577                    p++;
578                }
579            }
580        }
581
582        free(buffer);
583    } else {
584        ALOGW("Unable to open %s", file.string());
585    }
586
587    //ALOGI("Done!");
588    env->ReleaseLongArrayElements(outFields, sizesArray, 0);
589}
590
591jintArray android_os_Process_getPids(JNIEnv* env, jobject clazz,
592                                     jstring file, jintArray lastArray)
593{
594    if (file == NULL) {
595        jniThrowNullPointerException(env, NULL);
596        return NULL;
597    }
598
599    const char* file8 = env->GetStringUTFChars(file, NULL);
600    if (file8 == NULL) {
601        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
602        return NULL;
603    }
604
605    DIR* dirp = opendir(file8);
606
607    env->ReleaseStringUTFChars(file, file8);
608
609    if(dirp == NULL) {
610        return NULL;
611    }
612
613    jsize curCount = 0;
614    jint* curData = NULL;
615    if (lastArray != NULL) {
616        curCount = env->GetArrayLength(lastArray);
617        curData = env->GetIntArrayElements(lastArray, 0);
618    }
619
620    jint curPos = 0;
621
622    struct dirent* entry;
623    while ((entry=readdir(dirp)) != NULL) {
624        const char* p = entry->d_name;
625        while (*p) {
626            if (*p < '0' || *p > '9') break;
627            p++;
628        }
629        if (*p != 0) continue;
630
631        char* end;
632        int pid = strtol(entry->d_name, &end, 10);
633        //ALOGI("File %s pid=%d\n", entry->d_name, pid);
634        if (curPos >= curCount) {
635            jsize newCount = (curCount == 0) ? 10 : (curCount*2);
636            jintArray newArray = env->NewIntArray(newCount);
637            if (newArray == NULL) {
638                closedir(dirp);
639                jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
640                return NULL;
641            }
642            jint* newData = env->GetIntArrayElements(newArray, 0);
643            if (curData != NULL) {
644                memcpy(newData, curData, sizeof(jint)*curCount);
645                env->ReleaseIntArrayElements(lastArray, curData, 0);
646            }
647            lastArray = newArray;
648            curCount = newCount;
649            curData = newData;
650        }
651
652        curData[curPos] = pid;
653        curPos++;
654    }
655
656    closedir(dirp);
657
658    if (curData != NULL && curPos > 0) {
659        qsort(curData, curPos, sizeof(jint), pid_compare);
660    }
661
662    while (curPos < curCount) {
663        curData[curPos] = -1;
664        curPos++;
665    }
666
667    if (curData != NULL) {
668        env->ReleaseIntArrayElements(lastArray, curData, 0);
669    }
670
671    return lastArray;
672}
673
674enum {
675    PROC_TERM_MASK = 0xff,
676    PROC_ZERO_TERM = 0,
677    PROC_SPACE_TERM = ' ',
678    PROC_COMBINE = 0x100,
679    PROC_PARENS = 0x200,
680    PROC_QUOTES = 0x400,
681    PROC_OUT_STRING = 0x1000,
682    PROC_OUT_LONG = 0x2000,
683    PROC_OUT_FLOAT = 0x4000,
684};
685
686jboolean android_os_Process_parseProcLineArray(JNIEnv* env, jobject clazz,
687        char* buffer, jint startIndex, jint endIndex, jintArray format,
688        jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
689{
690
691    const jsize NF = env->GetArrayLength(format);
692    const jsize NS = outStrings ? env->GetArrayLength(outStrings) : 0;
693    const jsize NL = outLongs ? env->GetArrayLength(outLongs) : 0;
694    const jsize NR = outFloats ? env->GetArrayLength(outFloats) : 0;
695
696    jint* formatData = env->GetIntArrayElements(format, 0);
697    jlong* longsData = outLongs ?
698        env->GetLongArrayElements(outLongs, 0) : NULL;
699    jfloat* floatsData = outFloats ?
700        env->GetFloatArrayElements(outFloats, 0) : NULL;
701    if (formatData == NULL || (NL > 0 && longsData == NULL)
702            || (NR > 0 && floatsData == NULL)) {
703        if (formatData != NULL) {
704            env->ReleaseIntArrayElements(format, formatData, 0);
705        }
706        if (longsData != NULL) {
707            env->ReleaseLongArrayElements(outLongs, longsData, 0);
708        }
709        if (floatsData != NULL) {
710            env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
711        }
712        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
713        return JNI_FALSE;
714    }
715
716    jsize i = startIndex;
717    jsize di = 0;
718
719    jboolean res = JNI_TRUE;
720
721    for (jsize fi=0; fi<NF; fi++) {
722        jint mode = formatData[fi];
723        if ((mode&PROC_PARENS) != 0) {
724            i++;
725        } else if ((mode&PROC_QUOTES) != 0) {
726            if (buffer[i] == '"') {
727                i++;
728            } else {
729                mode &= ~PROC_QUOTES;
730            }
731        }
732        const char term = (char)(mode&PROC_TERM_MASK);
733        const jsize start = i;
734        if (i >= endIndex) {
735            if (kDebugProc) {
736                ALOGW("Ran off end of data @%d", i);
737            }
738            res = JNI_FALSE;
739            break;
740        }
741
742        jsize end = -1;
743        if ((mode&PROC_PARENS) != 0) {
744            while (i < endIndex && buffer[i] != ')') {
745                i++;
746            }
747            end = i;
748            i++;
749        } else if ((mode&PROC_QUOTES) != 0) {
750            while (buffer[i] != '"' && i < endIndex) {
751                i++;
752            }
753            end = i;
754            i++;
755        }
756        while (i < endIndex && buffer[i] != term) {
757            i++;
758        }
759        if (end < 0) {
760            end = i;
761        }
762
763        if (i < endIndex) {
764            i++;
765            if ((mode&PROC_COMBINE) != 0) {
766                while (i < endIndex && buffer[i] == term) {
767                    i++;
768                }
769            }
770        }
771
772        //ALOGI("Field %" PRId32 ": %" PRId32 "-%" PRId32 " dest=%" PRId32 " mode=0x%" PRIx32 "\n", i, start, end, di, mode);
773
774        if ((mode&(PROC_OUT_FLOAT|PROC_OUT_LONG|PROC_OUT_STRING)) != 0) {
775            char c = buffer[end];
776            buffer[end] = 0;
777            if ((mode&PROC_OUT_FLOAT) != 0 && di < NR) {
778                char* end;
779                floatsData[di] = strtof(buffer+start, &end);
780            }
781            if ((mode&PROC_OUT_LONG) != 0 && di < NL) {
782                char* end;
783                longsData[di] = strtoll(buffer+start, &end, 10);
784            }
785            if ((mode&PROC_OUT_STRING) != 0 && di < NS) {
786                jstring str = env->NewStringUTF(buffer+start);
787                env->SetObjectArrayElement(outStrings, di, str);
788            }
789            buffer[end] = c;
790            di++;
791        }
792    }
793
794    env->ReleaseIntArrayElements(format, formatData, 0);
795    if (longsData != NULL) {
796        env->ReleaseLongArrayElements(outLongs, longsData, 0);
797    }
798    if (floatsData != NULL) {
799        env->ReleaseFloatArrayElements(outFloats, floatsData, 0);
800    }
801
802    return res;
803}
804
805jboolean android_os_Process_parseProcLine(JNIEnv* env, jobject clazz,
806        jbyteArray buffer, jint startIndex, jint endIndex, jintArray format,
807        jobjectArray outStrings, jlongArray outLongs, jfloatArray outFloats)
808{
809        jbyte* bufferArray = env->GetByteArrayElements(buffer, NULL);
810
811        jboolean result = android_os_Process_parseProcLineArray(env, clazz,
812                (char*) bufferArray, startIndex, endIndex, format, outStrings,
813                outLongs, outFloats);
814
815        env->ReleaseByteArrayElements(buffer, bufferArray, 0);
816
817        return result;
818}
819
820jboolean android_os_Process_readProcFile(JNIEnv* env, jobject clazz,
821        jstring file, jintArray format, jobjectArray outStrings,
822        jlongArray outLongs, jfloatArray outFloats)
823{
824    if (file == NULL || format == NULL) {
825        jniThrowNullPointerException(env, NULL);
826        return JNI_FALSE;
827    }
828
829    const char* file8 = env->GetStringUTFChars(file, NULL);
830    if (file8 == NULL) {
831        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
832        return JNI_FALSE;
833    }
834    int fd = open(file8, O_RDONLY);
835
836    if (fd < 0) {
837        if (kDebugProc) {
838            ALOGW("Unable to open process file: %s\n", file8);
839        }
840        env->ReleaseStringUTFChars(file, file8);
841        return JNI_FALSE;
842    }
843    env->ReleaseStringUTFChars(file, file8);
844
845    char buffer[256];
846    const int len = read(fd, buffer, sizeof(buffer)-1);
847    close(fd);
848
849    if (len < 0) {
850        if (kDebugProc) {
851            ALOGW("Unable to open process file: %s fd=%d\n", file8, fd);
852        }
853        return JNI_FALSE;
854    }
855    buffer[len] = 0;
856
857    return android_os_Process_parseProcLineArray(env, clazz, buffer, 0, len,
858            format, outStrings, outLongs, outFloats);
859
860}
861
862void android_os_Process_setApplicationObject(JNIEnv* env, jobject clazz,
863                                             jobject binderObject)
864{
865    if (binderObject == NULL) {
866        jniThrowNullPointerException(env, NULL);
867        return;
868    }
869
870    sp<IBinder> binder = ibinderForJavaObject(env, binderObject);
871}
872
873void android_os_Process_sendSignal(JNIEnv* env, jobject clazz, jint pid, jint sig)
874{
875    if (pid > 0) {
876        ALOGI("Sending signal. PID: %" PRId32 " SIG: %" PRId32, pid, sig);
877        kill(pid, sig);
878    }
879}
880
881void android_os_Process_sendSignalQuiet(JNIEnv* env, jobject clazz, jint pid, jint sig)
882{
883    if (pid > 0) {
884        kill(pid, sig);
885    }
886}
887
888static jlong android_os_Process_getElapsedCpuTime(JNIEnv* env, jobject clazz)
889{
890    struct timespec ts;
891
892    int res = clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
893
894    if (res != 0) {
895        return (jlong) 0;
896    }
897
898    nsecs_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
899    return (jlong) nanoseconds_to_milliseconds(when);
900}
901
902static jlong android_os_Process_getPss(JNIEnv* env, jobject clazz, jint pid)
903{
904    char filename[64];
905
906    snprintf(filename, sizeof(filename), "/proc/%" PRId32 "/smaps", pid);
907
908    FILE * file = fopen(filename, "r");
909    if (!file) {
910        return (jlong) -1;
911    }
912
913    // Tally up all of the Pss from the various maps
914    char line[256];
915    jlong pss = 0;
916    while (fgets(line, sizeof(line), file)) {
917        jlong v;
918        if (sscanf(line, "Pss: %" SCNd64 " kB", &v) == 1) {
919            pss += v;
920        }
921    }
922
923    fclose(file);
924
925    // Return the Pss value in bytes, not kilobytes
926    return pss * 1024;
927}
928
929jintArray android_os_Process_getPidsForCommands(JNIEnv* env, jobject clazz,
930        jobjectArray commandNames)
931{
932    if (commandNames == NULL) {
933        jniThrowNullPointerException(env, NULL);
934        return NULL;
935    }
936
937    Vector<String8> commands;
938
939    jsize count = env->GetArrayLength(commandNames);
940
941    for (int i=0; i<count; i++) {
942        jobject obj = env->GetObjectArrayElement(commandNames, i);
943        if (obj != NULL) {
944            const char* str8 = env->GetStringUTFChars((jstring)obj, NULL);
945            if (str8 == NULL) {
946                jniThrowNullPointerException(env, "Element in commandNames");
947                return NULL;
948            }
949            commands.add(String8(str8));
950            env->ReleaseStringUTFChars((jstring)obj, str8);
951        } else {
952            jniThrowNullPointerException(env, "Element in commandNames");
953            return NULL;
954        }
955    }
956
957    Vector<jint> pids;
958
959    DIR *proc = opendir("/proc");
960    if (proc == NULL) {
961        fprintf(stderr, "/proc: %s\n", strerror(errno));
962        return NULL;
963    }
964
965    struct dirent *d;
966    while ((d = readdir(proc))) {
967        int pid = atoi(d->d_name);
968        if (pid <= 0) continue;
969
970        char path[PATH_MAX];
971        char data[PATH_MAX];
972        snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
973
974        int fd = open(path, O_RDONLY);
975        if (fd < 0) {
976            continue;
977        }
978        const int len = read(fd, data, sizeof(data)-1);
979        close(fd);
980
981        if (len < 0) {
982            continue;
983        }
984        data[len] = 0;
985
986        for (int i=0; i<len; i++) {
987            if (data[i] == ' ') {
988                data[i] = 0;
989                break;
990            }
991        }
992
993        for (size_t i=0; i<commands.size(); i++) {
994            if (commands[i] == data) {
995                pids.add(pid);
996                break;
997            }
998        }
999    }
1000
1001    closedir(proc);
1002
1003    jintArray pidArray = env->NewIntArray(pids.size());
1004    if (pidArray == NULL) {
1005        jniThrowException(env, "java/lang/OutOfMemoryError", NULL);
1006        return NULL;
1007    }
1008
1009    if (pids.size() > 0) {
1010        env->SetIntArrayRegion(pidArray, 0, pids.size(), pids.array());
1011    }
1012
1013    return pidArray;
1014}
1015
1016jint android_os_Process_killProcessGroup(JNIEnv* env, jobject clazz, jint uid, jint pid)
1017{
1018    return killProcessGroup(uid, pid, SIGKILL);
1019}
1020
1021void android_os_Process_removeAllProcessGroups(JNIEnv* env, jobject clazz)
1022{
1023    return removeAllProcessGroups();
1024}
1025
1026static const JNINativeMethod methods[] = {
1027    {"getUidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getUidForName},
1028    {"getGidForName",       "(Ljava/lang/String;)I", (void*)android_os_Process_getGidForName},
1029    {"setThreadPriority",   "(II)V", (void*)android_os_Process_setThreadPriority},
1030    {"setThreadScheduler",  "(III)V", (void*)android_os_Process_setThreadScheduler},
1031    {"setCanSelfBackground", "(Z)V", (void*)android_os_Process_setCanSelfBackground},
1032    {"setThreadPriority",   "(I)V", (void*)android_os_Process_setCallingThreadPriority},
1033    {"getThreadPriority",   "(I)I", (void*)android_os_Process_getThreadPriority},
1034    {"setThreadGroup",      "(II)V", (void*)android_os_Process_setThreadGroup},
1035    {"setProcessGroup",     "(II)V", (void*)android_os_Process_setProcessGroup},
1036    {"getProcessGroup",     "(I)I", (void*)android_os_Process_getProcessGroup},
1037    {"setSwappiness",   "(IZ)Z", (void*)android_os_Process_setSwappiness},
1038    {"setArgV0",    "(Ljava/lang/String;)V", (void*)android_os_Process_setArgV0},
1039    {"setUid", "(I)I", (void*)android_os_Process_setUid},
1040    {"setGid", "(I)I", (void*)android_os_Process_setGid},
1041    {"sendSignal", "(II)V", (void*)android_os_Process_sendSignal},
1042    {"sendSignalQuiet", "(II)V", (void*)android_os_Process_sendSignalQuiet},
1043    {"getFreeMemory", "()J", (void*)android_os_Process_getFreeMemory},
1044    {"getTotalMemory", "()J", (void*)android_os_Process_getTotalMemory},
1045    {"readProcLines", "(Ljava/lang/String;[Ljava/lang/String;[J)V", (void*)android_os_Process_readProcLines},
1046    {"getPids", "(Ljava/lang/String;[I)[I", (void*)android_os_Process_getPids},
1047    {"readProcFile", "(Ljava/lang/String;[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_readProcFile},
1048    {"parseProcLine", "([BII[I[Ljava/lang/String;[J[F)Z", (void*)android_os_Process_parseProcLine},
1049    {"getElapsedCpuTime", "()J", (void*)android_os_Process_getElapsedCpuTime},
1050    {"getPss", "(I)J", (void*)android_os_Process_getPss},
1051    {"getPidsForCommands", "([Ljava/lang/String;)[I", (void*)android_os_Process_getPidsForCommands},
1052    //{"setApplicationObject", "(Landroid/os/IBinder;)V", (void*)android_os_Process_setApplicationObject},
1053    {"killProcessGroup", "(II)I", (void*)android_os_Process_killProcessGroup},
1054    {"removeAllProcessGroups", "()V", (void*)android_os_Process_removeAllProcessGroups},
1055};
1056
1057const char* const kProcessPathName = "android/os/Process";
1058
1059int register_android_os_Process(JNIEnv* env)
1060{
1061    return AndroidRuntime::registerNativeMethods(
1062        env, kProcessPathName,
1063        methods, NELEM(methods));
1064}
1065