| /* |
| * Copyright (C) 2007-2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <fcntl.h> |
| |
| #include "JNIHelp.h" |
| #include "android_runtime/AndroidRuntime.h" |
| #include "jni.h" |
| #include "log/logger.h" |
| |
| #define UNUSED __attribute__((__unused__)) |
| |
| // The size of the tag number comes out of the payload size. |
| #define MAX_EVENT_PAYLOAD (LOGGER_ENTRY_MAX_PAYLOAD - sizeof(int32_t)) |
| |
| namespace android { |
| |
| static jclass gCollectionClass; |
| static jmethodID gCollectionAddID; |
| |
| static jclass gEventClass; |
| static jmethodID gEventInitID; |
| |
| static jclass gIntegerClass; |
| static jfieldID gIntegerValueID; |
| |
| static jclass gLongClass; |
| static jfieldID gLongValueID; |
| |
| static jclass gStringClass; |
| |
| /* |
| * In class android.util.EventLog: |
| * static native int writeEvent(int tag, int value) |
| */ |
| static jint android_util_EventLog_writeEvent_Integer(JNIEnv* env UNUSED, |
| jobject clazz UNUSED, |
| jint tag, jint value) |
| { |
| return android_btWriteLog(tag, EVENT_TYPE_INT, &value, sizeof(value)); |
| } |
| |
| /* |
| * In class android.util.EventLog: |
| * static native int writeEvent(long tag, long value) |
| */ |
| static jint android_util_EventLog_writeEvent_Long(JNIEnv* env UNUSED, |
| jobject clazz UNUSED, |
| jint tag, jlong value) |
| { |
| return android_btWriteLog(tag, EVENT_TYPE_LONG, &value, sizeof(value)); |
| } |
| |
| /* |
| * In class android.util.EventLog: |
| * static native int writeEvent(int tag, String value) |
| */ |
| static jint android_util_EventLog_writeEvent_String(JNIEnv* env, |
| jobject clazz UNUSED, |
| jint tag, jstring value) { |
| uint8_t buf[MAX_EVENT_PAYLOAD]; |
| |
| // Don't throw NPE -- I feel like it's sort of mean for a logging function |
| // to be all crashy if you pass in NULL -- but make the NULL value explicit. |
| const char *str = value != NULL ? env->GetStringUTFChars(value, NULL) : "NULL"; |
| uint32_t len = strlen(str); |
| size_t max = sizeof(buf) - sizeof(len) - 2; // Type byte, final newline |
| if (len > max) len = max; |
| |
| buf[0] = EVENT_TYPE_STRING; |
| memcpy(&buf[1], &len, sizeof(len)); |
| memcpy(&buf[1 + sizeof(len)], str, len); |
| buf[1 + sizeof(len) + len] = '\n'; |
| |
| if (value != NULL) env->ReleaseStringUTFChars(value, str); |
| return android_bWriteLog(tag, buf, 2 + sizeof(len) + len); |
| } |
| |
| /* |
| * In class android.util.EventLog: |
| * static native int writeEvent(long tag, Object... value) |
| */ |
| static jint android_util_EventLog_writeEvent_Array(JNIEnv* env, jobject clazz, |
| jint tag, jobjectArray value) { |
| if (value == NULL) { |
| return android_util_EventLog_writeEvent_String(env, clazz, tag, NULL); |
| } |
| |
| uint8_t buf[MAX_EVENT_PAYLOAD]; |
| const size_t max = sizeof(buf) - 1; // leave room for final newline |
| size_t pos = 2; // Save room for type tag & array count |
| |
| jsize copied = 0, num = env->GetArrayLength(value); |
| for (; copied < num && copied < 255; ++copied) { |
| jobject item = env->GetObjectArrayElement(value, copied); |
| if (item == NULL || env->IsInstanceOf(item, gStringClass)) { |
| if (pos + 1 + sizeof(jint) > max) break; |
| const char *str = item != NULL ? env->GetStringUTFChars((jstring) item, NULL) : "NULL"; |
| jint len = strlen(str); |
| if (pos + 1 + sizeof(len) + len > max) len = max - pos - 1 - sizeof(len); |
| buf[pos++] = EVENT_TYPE_STRING; |
| memcpy(&buf[pos], &len, sizeof(len)); |
| memcpy(&buf[pos + sizeof(len)], str, len); |
| pos += sizeof(len) + len; |
| if (item != NULL) env->ReleaseStringUTFChars((jstring) item, str); |
| } else if (env->IsInstanceOf(item, gIntegerClass)) { |
| jint intVal = env->GetIntField(item, gIntegerValueID); |
| if (pos + 1 + sizeof(intVal) > max) break; |
| buf[pos++] = EVENT_TYPE_INT; |
| memcpy(&buf[pos], &intVal, sizeof(intVal)); |
| pos += sizeof(intVal); |
| } else if (env->IsInstanceOf(item, gLongClass)) { |
| jlong longVal = env->GetLongField(item, gLongValueID); |
| if (pos + 1 + sizeof(longVal) > max) break; |
| buf[pos++] = EVENT_TYPE_LONG; |
| memcpy(&buf[pos], &longVal, sizeof(longVal)); |
| pos += sizeof(longVal); |
| } else { |
| jniThrowException(env, |
| "java/lang/IllegalArgumentException", |
| "Invalid payload item type"); |
| return -1; |
| } |
| env->DeleteLocalRef(item); |
| } |
| |
| buf[0] = EVENT_TYPE_LIST; |
| buf[1] = copied; |
| buf[pos++] = '\n'; |
| return android_bWriteLog(tag, buf, pos); |
| } |
| |
| /* |
| * In class android.util.EventLog: |
| * static native void readEvents(int[] tags, Collection<Event> output) |
| * |
| * Reads events from the event log |
| */ |
| static void android_util_EventLog_readEvents(JNIEnv* env, jobject clazz UNUSED, |
| jintArray tags, |
| jobject out) { |
| |
| if (tags == NULL || out == NULL) { |
| jniThrowNullPointerException(env, NULL); |
| return; |
| } |
| |
| struct logger_list *logger_list = android_logger_list_open( |
| LOG_ID_EVENTS, O_RDONLY | O_NONBLOCK, 0, 0); |
| |
| if (!logger_list) { |
| jniThrowIOException(env, errno); |
| return; |
| } |
| |
| jsize tagLength = env->GetArrayLength(tags); |
| jint *tagValues = env->GetIntArrayElements(tags, NULL); |
| |
| while (1) { |
| log_msg log_msg; |
| int ret = android_logger_list_read(logger_list, &log_msg); |
| |
| if (ret == 0) { |
| break; |
| } |
| if (ret < 0) { |
| if (ret == -EINTR) { |
| continue; |
| } |
| if (ret == -EINVAL) { |
| jniThrowException(env, "java/io/IOException", "Event too short"); |
| } else if (ret != -EAGAIN) { |
| jniThrowIOException(env, -ret); // Will throw on return |
| } |
| break; |
| } |
| |
| int32_t tag = * (int32_t *) log_msg.msg(); |
| |
| int found = 0; |
| for (int i = 0; !found && i < tagLength; ++i) { |
| found = (tag == tagValues[i]); |
| } |
| |
| if (found) { |
| jsize len = ret; |
| jbyteArray array = env->NewByteArray(len); |
| if (array == NULL) { |
| break; |
| } |
| |
| jbyte *bytes = env->GetByteArrayElements(array, NULL); |
| memcpy(bytes, log_msg.buf, len); |
| env->ReleaseByteArrayElements(array, bytes, 0); |
| |
| jobject event = env->NewObject(gEventClass, gEventInitID, array); |
| if (event == NULL) { |
| break; |
| } |
| |
| env->CallBooleanMethod(out, gCollectionAddID, event); |
| env->DeleteLocalRef(event); |
| env->DeleteLocalRef(array); |
| } |
| } |
| |
| android_logger_list_close(logger_list); |
| |
| env->ReleaseIntArrayElements(tags, tagValues, 0); |
| } |
| |
| /* |
| * JNI registration. |
| */ |
| static JNINativeMethod gRegisterMethods[] = { |
| /* name, signature, funcPtr */ |
| { "writeEvent", "(II)I", (void*) android_util_EventLog_writeEvent_Integer }, |
| { "writeEvent", "(IJ)I", (void*) android_util_EventLog_writeEvent_Long }, |
| { "writeEvent", |
| "(ILjava/lang/String;)I", |
| (void*) android_util_EventLog_writeEvent_String |
| }, |
| { "writeEvent", |
| "(I[Ljava/lang/Object;)I", |
| (void*) android_util_EventLog_writeEvent_Array |
| }, |
| { "readEvents", |
| "([ILjava/util/Collection;)V", |
| (void*) android_util_EventLog_readEvents |
| }, |
| }; |
| |
| static struct { const char *name; jclass *clazz; } gClasses[] = { |
| { "android/util/EventLog$Event", &gEventClass }, |
| { "java/lang/Integer", &gIntegerClass }, |
| { "java/lang/Long", &gLongClass }, |
| { "java/lang/String", &gStringClass }, |
| { "java/util/Collection", &gCollectionClass }, |
| }; |
| |
| static struct { jclass *c; const char *name, *ft; jfieldID *id; } gFields[] = { |
| { &gIntegerClass, "value", "I", &gIntegerValueID }, |
| { &gLongClass, "value", "J", &gLongValueID }, |
| }; |
| |
| static struct { jclass *c; const char *name, *mt; jmethodID *id; } gMethods[] = { |
| { &gEventClass, "<init>", "([B)V", &gEventInitID }, |
| { &gCollectionClass, "add", "(Ljava/lang/Object;)Z", &gCollectionAddID }, |
| }; |
| |
| int register_android_util_EventLog(JNIEnv* env) { |
| for (int i = 0; i < NELEM(gClasses); ++i) { |
| jclass clazz = env->FindClass(gClasses[i].name); |
| if (clazz == NULL) { |
| ALOGE("Can't find class: %s\n", gClasses[i].name); |
| return -1; |
| } |
| *gClasses[i].clazz = (jclass) env->NewGlobalRef(clazz); |
| } |
| |
| for (int i = 0; i < NELEM(gFields); ++i) { |
| *gFields[i].id = env->GetFieldID( |
| *gFields[i].c, gFields[i].name, gFields[i].ft); |
| if (*gFields[i].id == NULL) { |
| ALOGE("Can't find field: %s\n", gFields[i].name); |
| return -1; |
| } |
| } |
| |
| for (int i = 0; i < NELEM(gMethods); ++i) { |
| *gMethods[i].id = env->GetMethodID( |
| *gMethods[i].c, gMethods[i].name, gMethods[i].mt); |
| if (*gMethods[i].id == NULL) { |
| ALOGE("Can't find method: %s\n", gMethods[i].name); |
| return -1; |
| } |
| } |
| |
| return AndroidRuntime::registerNativeMethods( |
| env, |
| "android/util/EventLog", |
| gRegisterMethods, NELEM(gRegisterMethods)); |
| } |
| |
| }; // namespace android |