/*
|
* Copyright 2017, 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.
|
*/
|
|
#define LOG_TAG "wifi-jni"
|
|
#include <ctype.h>
|
#include <stdlib.h>
|
#include <sys/klog.h>
|
|
#include <log/log.h>
|
#include <jni.h>
|
#include <nativehelper/jni_macros.h>
|
#include <nativehelper/JNIHelp.h>
|
|
#include "jni_helper.h"
|
|
namespace android {
|
|
|
static jbyteArray android_net_wifi_readKernelLogNative(JNIEnv *env, jclass cls) {
|
JNIHelper helper(env);
|
ALOGV("Reading kernel logs");
|
|
int size = klogctl(/* SYSLOG_ACTION_SIZE_BUFFER */ 10, 0, 0);
|
if (size < 1) {
|
ALOGD("no kernel logs");
|
return helper.newByteArray(0).detach();
|
}
|
|
char *buf = (char *)malloc(size);
|
if (buf == NULL) {
|
ALOGD("can't allocate temporary storage");
|
return helper.newByteArray(0).detach();
|
}
|
|
int read = klogctl(/* SYSLOG_ACTION_READ_ALL */ 3, buf, size);
|
if (read < 0) {
|
ALOGD("can't read logs - %d", read);
|
free(buf);
|
return helper.newByteArray(0).detach();
|
} else {
|
ALOGV("read %d bytes", read);
|
}
|
|
if (read != size) {
|
ALOGV("read %d bytes, expecting %d", read, size);
|
}
|
|
JNIObject<jbyteArray> result = helper.newByteArray(read);
|
if (result.isNull()) {
|
ALOGD("can't allocate array");
|
free(buf);
|
return result.detach();
|
}
|
|
helper.setByteArrayRegion(result, 0, read, (jbyte*)buf);
|
free(buf);
|
return result.detach();
|
}
|
|
// ----------------------------------------------------------------------------
|
|
/*
|
* JNI registration.
|
*/
|
static JNINativeMethod gWifiMethods[] = {
|
NATIVE_METHOD(android_net_wifi, readKernelLogNative, "()[B"),
|
};
|
|
/* User to register native functions */
|
extern "C"
|
jint Java_com_android_server_wifi_WifiNative_registerNatives(JNIEnv* env, jclass clazz) {
|
return jniRegisterNativeMethods(env,
|
"com/android/server/wifi/WifiNative", gWifiMethods, NELEM(gWifiMethods));
|
}
|
|
}; // namespace android
|
