Android/frameworks_base
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jni: Incorporate liblog reading API

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Change-Id: I8b78e4db67b6daabb975ce740fb40478df4ffcef
This commit is contained in:
Mark Salyzyn
2013-12-05 10:06:18 -08:00
parent c2ee7bb146
commit e11cbd441d
1 changed files with 33 additions and 40 deletions
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73
core/jni/android_util_EventLog.cpp
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@@ -1,5 +1,5 @@
/*
* Copyright (C) 2007 The Android Open Source Project
* 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.
@@ -142,18 +142,21 @@ static jint android_util_EventLog_writeEvent_Array(JNIEnv* env, jobject clazz,
* In class android.util.EventLog:
* static native void readEvents(int[] tags, Collection<Event> output)
*
* Reads events from the event log, typically /dev/log/events
* Reads events from the event log
*/
static void android_util_EventLog_readEvents(JNIEnv* env, jobject clazz,
jintArray tags,
jobject out) {
if (tags == NULL || out == NULL) {
jniThrowNullPointerException(env, NULL);
return;
}
int fd = open("/dev/" LOGGER_LOG_EVENTS, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
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;
}
@@ -161,41 +164,26 @@ static void android_util_EventLog_readEvents(JNIEnv* env, jobject clazz,
jsize tagLength = env->GetArrayLength(tags);
jint *tagValues = env->GetIntArrayElements(tags, NULL);
uint8_t buf[LOGGER_ENTRY_MAX_LEN];
struct timeval timeout = {0, 0};
fd_set readset;
FD_ZERO(&readset);
while (1) {
log_msg log_msg;
int ret = android_logger_list_read(logger_list, &log_msg);
for (;;) {
// Use a short select() to try to avoid problems hanging on read().
// This means we block for 5ms at the end of the log -- oh well.
timeout.tv_usec = 5000;
FD_SET(fd, &readset);
int r = select(fd + 1, &readset, NULL, NULL, &timeout);
if (r == 0) {
break; // no more events
} else if (r < 0 && errno == EINTR) {
continue; // interrupted by signal, try again
} else if (r < 0) {
jniThrowIOException(env, errno); // Will throw on return
if (ret == 0) {
break;
}
if (ret < 0) {
if (errno == EINTR) {
continue;
}
if (errno == EINVAL) {
jniThrowException(env, "java/io/IOException", "Event too short");
} else if (errno != EAGAIN) {
jniThrowIOException(env, errno); // Will throw on return
}
break;
}
int len = read(fd, buf, sizeof(buf));
if (len == 0 || (len < 0 && errno == EAGAIN)) {
break; // no more events
} else if (len < 0 && errno == EINTR) {
continue; // interrupted by signal, try again
} else if (len < 0) {
jniThrowIOException(env, errno); // Will throw on return
break;
} else if ((size_t) len < sizeof(logger_entry) + sizeof(int32_t)) {
jniThrowException(env, "java/io/IOException", "Event too short");
break;
}
logger_entry* entry = (logger_entry*) buf;
int32_t tag = * (int32_t*) (buf + sizeof(*entry));
int32_t tag = * (int32_t *) log_msg.msg();
int found = 0;
for (int i = 0; !found && i < tagLength; ++i) {
@@ -203,16 +191,20 @@ static void android_util_EventLog_readEvents(JNIEnv* env, jobject clazz,
}
if (found) {
jsize len = sizeof(*entry) + entry->len;
jsize len = ret;
jbyteArray array = env->NewByteArray(len);
if (array == NULL) break;
if (array == NULL) {
break;
}
jbyte *bytes = env->GetByteArrayElements(array, NULL);
memcpy(bytes, buf, len);
memcpy(bytes, log_msg.buf, len);
env->ReleaseByteArrayElements(array, bytes, 0);
jobject event = env->NewObject(gEventClass, gEventInitID, array);
if (event == NULL) break;
if (event == NULL) {
break;
}
env->CallBooleanMethod(out, gCollectionAddID, event);
env->DeleteLocalRef(event);
@@ -220,7 +212,8 @@ static void android_util_EventLog_readEvents(JNIEnv* env, jobject clazz,
}
}
close(fd);
android_logger_list_close(logger_list);
env->ReleaseIntArrayElements(tags, tagValues, 0);
}