The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <fcntl.h> |
| 18 | |
| 19 | #include "JNIHelp.h" |
| 20 | #include "android_runtime/AndroidRuntime.h" |
| 21 | #include "jni.h" |
| 22 | #include "cutils/logger.h" |
| 23 | |
Dan Egnor | 6916089 | 2010-01-06 23:12:57 -0800 | [diff] [blame] | 24 | // The size of the tag number comes out of the payload size. |
| 25 | #define MAX_EVENT_PAYLOAD (LOGGER_ENTRY_MAX_PAYLOAD - sizeof(int32_t)) |
| 26 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 27 | namespace android { |
| 28 | |
| 29 | static jclass gCollectionClass; |
| 30 | static jmethodID gCollectionAddID; |
| 31 | |
| 32 | static jclass gEventClass; |
| 33 | static jmethodID gEventInitID; |
| 34 | |
| 35 | static jclass gIntegerClass; |
| 36 | static jfieldID gIntegerValueID; |
| 37 | |
| 38 | static jclass gListClass; |
| 39 | static jfieldID gListItemsID; |
| 40 | |
| 41 | static jclass gLongClass; |
| 42 | static jfieldID gLongValueID; |
| 43 | |
| 44 | static jclass gStringClass; |
| 45 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 46 | /* |
| 47 | * In class android.util.EventLog: |
| 48 | * static native int writeEvent(int tag, int value) |
| 49 | */ |
| 50 | static jint android_util_EventLog_writeEvent_Integer(JNIEnv* env, jobject clazz, |
| 51 | jint tag, jint value) |
| 52 | { |
| 53 | return android_btWriteLog(tag, EVENT_TYPE_INT, &value, sizeof(value)); |
| 54 | } |
| 55 | |
| 56 | /* |
| 57 | * In class android.util.EventLog: |
| 58 | * static native int writeEvent(long tag, long value) |
| 59 | */ |
Jim Miller | 95ff240 | 2009-07-01 18:03:41 -0700 | [diff] [blame] | 60 | static jint android_util_EventLog_writeEvent_Long(JNIEnv* env, jobject clazz, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 61 | jint tag, jlong value) |
| 62 | { |
| 63 | return android_btWriteLog(tag, EVENT_TYPE_LONG, &value, sizeof(value)); |
| 64 | } |
| 65 | |
| 66 | /* |
| 67 | * In class android.util.EventLog: |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 68 | * static native int writeEvent(int tag, String value) |
| 69 | */ |
| 70 | static jint android_util_EventLog_writeEvent_String(JNIEnv* env, jobject clazz, |
| 71 | jint tag, jstring value) { |
Dan Egnor | 6916089 | 2010-01-06 23:12:57 -0800 | [diff] [blame] | 72 | uint8_t buf[MAX_EVENT_PAYLOAD]; |
Dan Egnor | 62136d3 | 2010-01-05 19:09:08 -0800 | [diff] [blame] | 73 | |
| 74 | // Don't throw NPE -- I feel like it's sort of mean for a logging function |
| 75 | // to be all crashy if you pass in NULL -- but make the NULL value explicit. |
| 76 | const char *str = value != NULL ? env->GetStringUTFChars(value, NULL) : "NULL"; |
| 77 | jint len = strlen(str); |
| 78 | const int max = sizeof(buf) - sizeof(len) - 2; // Type byte, final newline |
| 79 | if (len > max) len = max; |
| 80 | |
| 81 | buf[0] = EVENT_TYPE_STRING; |
| 82 | memcpy(&buf[1], &len, sizeof(len)); |
| 83 | memcpy(&buf[1 + sizeof(len)], str, len); |
| 84 | buf[1 + sizeof(len) + len] = '\n'; |
| 85 | |
| 86 | if (value != NULL) env->ReleaseStringUTFChars(value, str); |
| 87 | return android_bWriteLog(tag, buf, 2 + sizeof(len) + len); |
| 88 | } |
| 89 | |
| 90 | /* |
| 91 | * In class android.util.EventLog: |
| 92 | * static native int writeEvent(long tag, Object... value) |
| 93 | */ |
| 94 | static jint android_util_EventLog_writeEvent_Array(JNIEnv* env, jobject clazz, |
| 95 | jint tag, jobjectArray value) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 96 | if (value == NULL) { |
Dan Egnor | 62136d3 | 2010-01-05 19:09:08 -0800 | [diff] [blame] | 97 | return android_util_EventLog_writeEvent_String(env, clazz, tag, NULL); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 98 | } |
| 99 | |
Dan Egnor | 6916089 | 2010-01-06 23:12:57 -0800 | [diff] [blame] | 100 | uint8_t buf[MAX_EVENT_PAYLOAD]; |
Dan Egnor | 62136d3 | 2010-01-05 19:09:08 -0800 | [diff] [blame] | 101 | const size_t max = sizeof(buf) - 1; // leave room for final newline |
| 102 | size_t pos = 2; // Save room for type tag & array count |
| 103 | |
| 104 | jsize copied = 0, num = env->GetArrayLength(value); |
Dan Egnor | 6916089 | 2010-01-06 23:12:57 -0800 | [diff] [blame] | 105 | for (; copied < num && copied < 255; ++copied) { |
Dan Egnor | 62136d3 | 2010-01-05 19:09:08 -0800 | [diff] [blame] | 106 | jobject item = env->GetObjectArrayElement(value, copied); |
| 107 | if (item == NULL || env->IsInstanceOf(item, gStringClass)) { |
| 108 | if (pos + 1 + sizeof(jint) > max) break; |
| 109 | const char *str = item != NULL ? env->GetStringUTFChars((jstring) item, NULL) : "NULL"; |
| 110 | jint len = strlen(str); |
| 111 | if (pos + 1 + sizeof(len) + len > max) len = max - pos - 1 - sizeof(len); |
| 112 | buf[pos++] = EVENT_TYPE_STRING; |
| 113 | memcpy(&buf[pos], &len, sizeof(len)); |
| 114 | memcpy(&buf[pos + sizeof(len)], str, len); |
| 115 | pos += sizeof(len) + len; |
| 116 | if (item != NULL) env->ReleaseStringUTFChars((jstring) item, str); |
| 117 | } else if (env->IsInstanceOf(item, gIntegerClass)) { |
| 118 | jint intVal = env->GetIntField(item, gIntegerValueID); |
| 119 | if (pos + 1 + sizeof(intVal) > max) break; |
| 120 | buf[pos++] = EVENT_TYPE_INT; |
| 121 | memcpy(&buf[pos], &intVal, sizeof(intVal)); |
| 122 | pos += sizeof(intVal); |
| 123 | } else if (env->IsInstanceOf(item, gLongClass)) { |
| 124 | jlong longVal = env->GetLongField(item, gLongValueID); |
| 125 | if (pos + 1 + sizeof(longVal) > max) break; |
| 126 | buf[pos++] = EVENT_TYPE_LONG; |
| 127 | memcpy(&buf[pos], &longVal, sizeof(longVal)); |
| 128 | pos += sizeof(longVal); |
| 129 | } else { |
| 130 | jniThrowException(env, |
| 131 | "java/lang/IllegalArgumentException", |
| 132 | "Invalid payload item type"); |
| 133 | return -1; |
| 134 | } |
| 135 | env->DeleteLocalRef(item); |
| 136 | } |
| 137 | |
| 138 | buf[0] = EVENT_TYPE_LIST; |
| 139 | buf[1] = copied; |
| 140 | buf[pos++] = '\n'; |
| 141 | return android_bWriteLog(tag, buf, pos); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 142 | } |
| 143 | |
| 144 | /* |
| 145 | * In class android.util.EventLog: |
| 146 | * static native void readEvents(int[] tags, Collection<Event> output) |
Jim Miller | 95ff240 | 2009-07-01 18:03:41 -0700 | [diff] [blame] | 147 | * |
| 148 | * Reads events from the event log, typically /dev/log/events |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 149 | */ |
| 150 | static void android_util_EventLog_readEvents(JNIEnv* env, jobject clazz, |
| 151 | jintArray tags, |
| 152 | jobject out) { |
| 153 | if (tags == NULL || out == NULL) { |
| 154 | jniThrowException(env, "java/lang/NullPointerException", NULL); |
| 155 | return; |
| 156 | } |
| 157 | |
| 158 | int fd = open("/dev/" LOGGER_LOG_EVENTS, O_RDONLY | O_NONBLOCK); |
| 159 | if (fd < 0) { |
| 160 | jniThrowIOException(env, errno); |
| 161 | return; |
| 162 | } |
| 163 | |
| 164 | jsize tagLength = env->GetArrayLength(tags); |
| 165 | jint *tagValues = env->GetIntArrayElements(tags, NULL); |
| 166 | |
| 167 | uint8_t buf[LOGGER_ENTRY_MAX_LEN]; |
Dan Egnor | 78158db | 2010-04-08 22:19:15 -0700 | [diff] [blame^] | 168 | struct timeval timeout = {0, 0}; |
| 169 | fd_set readset; |
| 170 | FD_ZERO(&readset); |
| 171 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 172 | for (;;) { |
Dan Egnor | 78158db | 2010-04-08 22:19:15 -0700 | [diff] [blame^] | 173 | // Use a short select() to try to avoid problems hanging on read(). |
| 174 | // This means we block for 5ms at the end of the log -- oh well. |
| 175 | timeout.tv_usec = 5000; |
| 176 | FD_SET(fd, &readset); |
| 177 | int r = select(fd + 1, &readset, NULL, NULL, &timeout); |
| 178 | if (r == 0) { |
| 179 | break; // no more events |
| 180 | } else if (r < 0 && errno == EINTR) { |
| 181 | continue; // interrupted by signal, try again |
| 182 | } else if (r < 0) { |
| 183 | jniThrowIOException(env, errno); // Will throw on return |
| 184 | break; |
| 185 | } |
| 186 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 187 | int len = read(fd, buf, sizeof(buf)); |
| 188 | if (len == 0 || (len < 0 && errno == EAGAIN)) { |
Dan Egnor | 78158db | 2010-04-08 22:19:15 -0700 | [diff] [blame^] | 189 | break; // no more events |
| 190 | } else if (len < 0 && errno == EINTR) { |
| 191 | continue; // interrupted by signal, try again |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 192 | } else if (len < 0) { |
Dan Egnor | 78158db | 2010-04-08 22:19:15 -0700 | [diff] [blame^] | 193 | jniThrowIOException(env, errno); // Will throw on return |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 194 | break; |
| 195 | } else if ((size_t) len < sizeof(logger_entry) + sizeof(int32_t)) { |
| 196 | jniThrowException(env, "java/io/IOException", "Event too short"); |
| 197 | break; |
| 198 | } |
| 199 | |
| 200 | logger_entry* entry = (logger_entry*) buf; |
| 201 | int32_t tag = * (int32_t*) (buf + sizeof(*entry)); |
| 202 | |
| 203 | int found = 0; |
| 204 | for (int i = 0; !found && i < tagLength; ++i) { |
| 205 | found = (tag == tagValues[i]); |
| 206 | } |
| 207 | |
| 208 | if (found) { |
| 209 | jsize len = sizeof(*entry) + entry->len; |
| 210 | jbyteArray array = env->NewByteArray(len); |
| 211 | if (array == NULL) break; |
| 212 | |
| 213 | jbyte *bytes = env->GetByteArrayElements(array, NULL); |
| 214 | memcpy(bytes, buf, len); |
| 215 | env->ReleaseByteArrayElements(array, bytes, 0); |
| 216 | |
| 217 | jobject event = env->NewObject(gEventClass, gEventInitID, array); |
| 218 | if (event == NULL) break; |
| 219 | |
| 220 | env->CallBooleanMethod(out, gCollectionAddID, event); |
| 221 | env->DeleteLocalRef(event); |
| 222 | env->DeleteLocalRef(array); |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | close(fd); |
| 227 | env->ReleaseIntArrayElements(tags, tagValues, 0); |
| 228 | } |
| 229 | |
Jim Miller | 95ff240 | 2009-07-01 18:03:41 -0700 | [diff] [blame] | 230 | /* |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 231 | * JNI registration. |
| 232 | */ |
| 233 | static JNINativeMethod gRegisterMethods[] = { |
| 234 | /* name, signature, funcPtr */ |
| 235 | { "writeEvent", "(II)I", (void*) android_util_EventLog_writeEvent_Integer }, |
| 236 | { "writeEvent", "(IJ)I", (void*) android_util_EventLog_writeEvent_Long }, |
| 237 | { "writeEvent", |
| 238 | "(ILjava/lang/String;)I", |
| 239 | (void*) android_util_EventLog_writeEvent_String |
| 240 | }, |
| 241 | { "writeEvent", |
Dan Egnor | 62136d3 | 2010-01-05 19:09:08 -0800 | [diff] [blame] | 242 | "(I[Ljava/lang/Object;)I", |
| 243 | (void*) android_util_EventLog_writeEvent_Array |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 244 | }, |
| 245 | { "readEvents", |
| 246 | "([ILjava/util/Collection;)V", |
| 247 | (void*) android_util_EventLog_readEvents |
Jim Miller | 95ff240 | 2009-07-01 18:03:41 -0700 | [diff] [blame] | 248 | }, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 249 | }; |
| 250 | |
| 251 | static struct { const char *name; jclass *clazz; } gClasses[] = { |
| 252 | { "android/util/EventLog$Event", &gEventClass }, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 253 | { "java/lang/Integer", &gIntegerClass }, |
| 254 | { "java/lang/Long", &gLongClass }, |
| 255 | { "java/lang/String", &gStringClass }, |
| 256 | { "java/util/Collection", &gCollectionClass }, |
| 257 | }; |
| 258 | |
| 259 | static struct { jclass *c; const char *name, *ft; jfieldID *id; } gFields[] = { |
| 260 | { &gIntegerClass, "value", "I", &gIntegerValueID }, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 261 | { &gLongClass, "value", "J", &gLongValueID }, |
| 262 | }; |
| 263 | |
| 264 | static struct { jclass *c; const char *name, *mt; jmethodID *id; } gMethods[] = { |
| 265 | { &gEventClass, "<init>", "([B)V", &gEventInitID }, |
| 266 | { &gCollectionClass, "add", "(Ljava/lang/Object;)Z", &gCollectionAddID }, |
| 267 | }; |
| 268 | |
| 269 | int register_android_util_EventLog(JNIEnv* env) { |
| 270 | for (int i = 0; i < NELEM(gClasses); ++i) { |
| 271 | jclass clazz = env->FindClass(gClasses[i].name); |
| 272 | if (clazz == NULL) { |
| 273 | LOGE("Can't find class: %s\n", gClasses[i].name); |
| 274 | return -1; |
| 275 | } |
| 276 | *gClasses[i].clazz = (jclass) env->NewGlobalRef(clazz); |
| 277 | } |
| 278 | |
| 279 | for (int i = 0; i < NELEM(gFields); ++i) { |
| 280 | *gFields[i].id = env->GetFieldID( |
| 281 | *gFields[i].c, gFields[i].name, gFields[i].ft); |
| 282 | if (*gFields[i].id == NULL) { |
| 283 | LOGE("Can't find field: %s\n", gFields[i].name); |
| 284 | return -1; |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | for (int i = 0; i < NELEM(gMethods); ++i) { |
| 289 | *gMethods[i].id = env->GetMethodID( |
| 290 | *gMethods[i].c, gMethods[i].name, gMethods[i].mt); |
| 291 | if (*gMethods[i].id == NULL) { |
| 292 | LOGE("Can't find method: %s\n", gMethods[i].name); |
| 293 | return -1; |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | return AndroidRuntime::registerNativeMethods( |
| 298 | env, |
| 299 | "android/util/EventLog", |
| 300 | gRegisterMethods, NELEM(gRegisterMethods)); |
| 301 | } |
| 302 | |
| 303 | }; // namespace android |