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/* //device/libs/android_runtime/android_util_FileObserver.cpp
**
** Copyright 2006, 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 "JNIHelp.h"
#include "jni.h"
#include "utils/Log.h"
#include "utils/misc.h"
#include "android_runtime/AndroidRuntime.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <errno.h>
#ifdef HAVE_INOTIFY
#include <sys/inotify.h>
#endif
namespace android {
static jmethodID method_onEvent;
static jint android_os_fileobserver_init(JNIEnv* env, jobject object)
{
#ifdef HAVE_INOTIFY
return (jint)inotify_init();
#else // HAVE_INOTIFY
return -1;
#endif // HAVE_INOTIFY
}
static void android_os_fileobserver_observe(JNIEnv* env, jobject object, jint fd)
{
#ifdef HAVE_INOTIFY
char event_buf[512];
struct inotify_event* event;
while (1)
{
int event_pos = 0;
int num_bytes = read(fd, event_buf, sizeof(event_buf));
if (num_bytes < (int)sizeof(*event))
{
if (errno == EINTR)
continue;
ALOGE("***** ERROR! android_os_fileobserver_observe() got a short event!");
return;
}
while (num_bytes >= (int)sizeof(*event))
{
int event_size;
event = (struct inotify_event *)(event_buf + event_pos);
jstring path = NULL;
if (event->len > 0)
{
path = env->NewStringUTF(event->name);
}
env->CallVoidMethod(object, method_onEvent, event->wd, event->mask, path);
if (env->ExceptionCheck()) {
env->ExceptionDescribe();
env->ExceptionClear();
}
if (path != NULL)
{
env->DeleteLocalRef(path);
}
event_size = sizeof(*event) + event->len;
num_bytes -= event_size;
event_pos += event_size;
}
}
#endif // HAVE_INOTIFY
}
static jint android_os_fileobserver_startWatching(JNIEnv* env, jobject object, jint fd, jstring pathString, jint mask)
{
int res = -1;
#ifdef HAVE_INOTIFY
if (fd >= 0)
{
const char* path = env->GetStringUTFChars(pathString, NULL);
res = inotify_add_watch(fd, path, mask);
env->ReleaseStringUTFChars(pathString, path);
}
#endif // HAVE_INOTIFY
return res;
}
static void android_os_fileobserver_stopWatching(JNIEnv* env, jobject object, jint fd, jint wfd)
{
#ifdef HAVE_INOTIFY
inotify_rm_watch((int)fd, (uint32_t)wfd);
#endif // HAVE_INOTIFY
}
static JNINativeMethod sMethods[] = {
/* name, signature, funcPtr */
{ "init", "()I", (void*)android_os_fileobserver_init },
{ "observe", "(I)V", (void*)android_os_fileobserver_observe },
{ "startWatching", "(ILjava/lang/String;I)I", (void*)android_os_fileobserver_startWatching },
{ "stopWatching", "(II)V", (void*)android_os_fileobserver_stopWatching }
};
int register_android_os_FileObserver(JNIEnv* env)
{
jclass clazz;
clazz = env->FindClass("android/os/FileObserver$ObserverThread");
if (clazz == NULL)
{
ALOGE("Can't find android/os/FileObserver$ObserverThread");
return -1;
}
method_onEvent = env->GetMethodID(clazz, "onEvent", "(IILjava/lang/String;)V");
if (method_onEvent == NULL)
{
ALOGE("Can't find FileObserver.onEvent(int, int, String)");
return -1;
}
return AndroidRuntime::registerNativeMethods(env, "android/os/FileObserver$ObserverThread", sMethods, NELEM(sMethods));
}
} /* namespace android */
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