/* //device/libs/android_runtime/android_util_FileObserver.cpp
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**
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** Copyright 2006, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#include <nativehelper/JNIHelp.h>
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#include <nativehelper/ScopedPrimitiveArray.h>
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#include <nativehelper/ScopedUtfChars.h>
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#include "jni.h"
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#include "utils/Log.h"
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#include "utils/misc.h"
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#include "core_jni_helpers.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#if defined(__linux__)
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#include <sys/inotify.h>
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#endif
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namespace android {
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static jmethodID method_onEvent;
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static jint android_os_fileobserver_init(JNIEnv* env, jobject object)
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{
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#if defined(__linux__)
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return (jint)inotify_init1(IN_CLOEXEC);
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#else
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return -1;
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#endif
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}
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static void android_os_fileobserver_observe(JNIEnv* env, jobject object, jint fd)
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{
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#if defined(__linux__)
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char event_buf[512];
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struct inotify_event* event;
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while (1)
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{
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int event_pos = 0;
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int num_bytes = read(fd, event_buf, sizeof(event_buf));
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if (num_bytes < (int)sizeof(*event))
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{
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if (errno == EINTR)
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continue;
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ALOGE("***** ERROR! android_os_fileobserver_observe() got a short event!");
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return;
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}
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while (num_bytes >= (int)sizeof(*event))
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{
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int event_size;
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event = (struct inotify_event *)(event_buf + event_pos);
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jstring path = NULL;
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if (event->len > 0)
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{
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path = env->NewStringUTF(event->name);
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}
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env->CallVoidMethod(object, method_onEvent, event->wd, event->mask, path);
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if (env->ExceptionCheck()) {
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env->ExceptionDescribe();
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env->ExceptionClear();
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}
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if (path != NULL)
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{
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env->DeleteLocalRef(path);
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}
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event_size = sizeof(*event) + event->len;
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num_bytes -= event_size;
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event_pos += event_size;
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}
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}
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#endif
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}
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static void android_os_fileobserver_startWatching(JNIEnv* env, jobject object, jint fd,
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jobjectArray pathStrings, jint mask,
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jintArray wfdArray)
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{
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ScopedIntArrayRW wfds(env, wfdArray);
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if (wfds.get() == nullptr) {
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jniThrowException(env, "java/lang/IllegalStateException", "Failed to get ScopedIntArrayRW");
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}
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#if defined(__linux__)
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if (fd >= 0)
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{
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size_t count = wfds.size();
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for (jsize i = 0; i < count; ++i) {
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jstring pathString = (jstring) env->GetObjectArrayElement(pathStrings, i);
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ScopedUtfChars path(env, pathString);
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wfds[i] = inotify_add_watch(fd, path.c_str(), mask);
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}
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}
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#endif
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}
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static void android_os_fileobserver_stopWatching(JNIEnv* env, jobject object,
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jint fd, jintArray wfdArray)
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{
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#if defined(__linux__)
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ScopedIntArrayRO wfds(env, wfdArray);
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if (wfds.get() == nullptr) {
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jniThrowException(env, "java/lang/IllegalStateException", "Failed to get ScopedIntArrayRO");
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}
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size_t count = wfds.size();
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for (size_t i = 0; i < count; ++i) {
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inotify_rm_watch((int)fd, (uint32_t)wfds[i]);
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}
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#endif
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}
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static const JNINativeMethod sMethods[] = {
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/* name, signature, funcPtr */
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{ "init", "()I", (void*)android_os_fileobserver_init },
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{ "observe", "(I)V", (void*)android_os_fileobserver_observe },
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{ "startWatching", "(I[Ljava/lang/String;I[I)V", (void*)android_os_fileobserver_startWatching },
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{ "stopWatching", "(I[I)V", (void*)android_os_fileobserver_stopWatching }
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};
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int register_android_os_FileObserver(JNIEnv* env)
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{
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jclass clazz = FindClassOrDie(env, "android/os/FileObserver$ObserverThread");
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method_onEvent = GetMethodIDOrDie(env, clazz, "onEvent", "(IILjava/lang/String;)V");
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return RegisterMethodsOrDie(env, "android/os/FileObserver$ObserverThread", sMethods,
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NELEM(sMethods));
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}
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} /* namespace android */
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