The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* //device/libs/android_runtime/android_util_FileObserver.cpp |
| 2 | ** |
| 3 | ** Copyright 2006, The Android Open Source Project |
| 4 | ** |
| 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
| 8 | ** |
| 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | ** |
| 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
| 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | #include "JNIHelp.h" |
| 19 | #include "jni.h" |
| 20 | #include "utils/Log.h" |
| 21 | #include "utils/misc.h" |
| 22 | #include "android_runtime/AndroidRuntime.h" |
| 23 | |
| 24 | #include <stdio.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <string.h> |
| 27 | #include <stdint.h> |
| 28 | #include <fcntl.h> |
| 29 | #include <sys/ioctl.h> |
| 30 | #include <errno.h> |
| 31 | |
| 32 | #ifdef HAVE_INOTIFY |
| 33 | #include <sys/inotify.h> |
| 34 | #endif |
| 35 | |
| 36 | namespace android { |
| 37 | |
| 38 | static jmethodID method_onEvent; |
| 39 | |
| 40 | static jint android_os_fileobserver_init(JNIEnv* env, jobject object) |
| 41 | { |
| 42 | #ifdef HAVE_INOTIFY |
| 43 | |
| 44 | return (jint)inotify_init(); |
| 45 | |
| 46 | #else // HAVE_INOTIFY |
| 47 | |
| 48 | return -1; |
| 49 | |
| 50 | #endif // HAVE_INOTIFY |
| 51 | } |
| 52 | |
| 53 | static void android_os_fileobserver_observe(JNIEnv* env, jobject object, jint fd) |
| 54 | { |
| 55 | #ifdef HAVE_INOTIFY |
| 56 | |
| 57 | char event_buf[512]; |
| 58 | struct inotify_event* event; |
| 59 | |
| 60 | while (1) |
| 61 | { |
| 62 | int event_pos = 0; |
| 63 | int num_bytes = read(fd, event_buf, sizeof(event_buf)); |
| 64 | |
| 65 | if (num_bytes < (int)sizeof(*event)) |
| 66 | { |
| 67 | if (errno == EINTR) |
| 68 | continue; |
| 69 | |
Steve Block | 3762c31 | 2012-01-06 19:20:56 +0000 | [diff] [blame] | 70 | ALOGE("***** ERROR! android_os_fileobserver_observe() got a short event!"); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 71 | return; |
| 72 | } |
| 73 | |
Mike Lockwood | 59d25d0 | 2010-02-18 07:01:28 -0500 | [diff] [blame] | 74 | while (num_bytes >= (int)sizeof(*event)) |
| 75 | { |
| 76 | int event_size; |
| 77 | event = (struct inotify_event *)(event_buf + event_pos); |
| 78 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 79 | jstring path = NULL; |
| 80 | |
| 81 | if (event->len > 0) |
| 82 | { |
| 83 | path = env->NewStringUTF(event->name); |
| 84 | } |
Mike Lockwood | 59d25d0 | 2010-02-18 07:01:28 -0500 | [diff] [blame] | 85 | |
| 86 | env->CallVoidMethod(object, method_onEvent, event->wd, event->mask, path); |
| 87 | if (env->ExceptionCheck()) { |
| 88 | env->ExceptionDescribe(); |
| 89 | env->ExceptionClear(); |
| 90 | } |
The Android Open Source Project | b22d55b | 2009-03-05 15:45:10 -0800 | [diff] [blame] | 91 | if (path != NULL) |
| 92 | { |
| 93 | env->DeleteLocalRef(path); |
| 94 | } |
Mike Lockwood | 59d25d0 | 2010-02-18 07:01:28 -0500 | [diff] [blame] | 95 | |
| 96 | event_size = sizeof(*event) + event->len; |
| 97 | num_bytes -= event_size; |
| 98 | event_pos += event_size; |
| 99 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 100 | } |
| 101 | |
| 102 | #endif // HAVE_INOTIFY |
| 103 | } |
| 104 | |
| 105 | static jint android_os_fileobserver_startWatching(JNIEnv* env, jobject object, jint fd, jstring pathString, jint mask) |
| 106 | { |
| 107 | int res = -1; |
| 108 | |
| 109 | #ifdef HAVE_INOTIFY |
| 110 | |
| 111 | if (fd >= 0) |
| 112 | { |
| 113 | const char* path = env->GetStringUTFChars(pathString, NULL); |
| 114 | |
| 115 | res = inotify_add_watch(fd, path, mask); |
| 116 | |
| 117 | env->ReleaseStringUTFChars(pathString, path); |
| 118 | } |
| 119 | |
| 120 | #endif // HAVE_INOTIFY |
| 121 | |
| 122 | return res; |
| 123 | } |
| 124 | |
| 125 | static void android_os_fileobserver_stopWatching(JNIEnv* env, jobject object, jint fd, jint wfd) |
| 126 | { |
| 127 | #ifdef HAVE_INOTIFY |
| 128 | |
| 129 | inotify_rm_watch((int)fd, (uint32_t)wfd); |
| 130 | |
| 131 | #endif // HAVE_INOTIFY |
| 132 | } |
| 133 | |
| 134 | static JNINativeMethod sMethods[] = { |
| 135 | /* name, signature, funcPtr */ |
| 136 | { "init", "()I", (void*)android_os_fileobserver_init }, |
| 137 | { "observe", "(I)V", (void*)android_os_fileobserver_observe }, |
| 138 | { "startWatching", "(ILjava/lang/String;I)I", (void*)android_os_fileobserver_startWatching }, |
| 139 | { "stopWatching", "(II)V", (void*)android_os_fileobserver_stopWatching } |
| 140 | |
| 141 | }; |
| 142 | |
| 143 | int register_android_os_FileObserver(JNIEnv* env) |
| 144 | { |
| 145 | jclass clazz; |
| 146 | |
| 147 | clazz = env->FindClass("android/os/FileObserver$ObserverThread"); |
| 148 | |
| 149 | if (clazz == NULL) |
| 150 | { |
Steve Block | 3762c31 | 2012-01-06 19:20:56 +0000 | [diff] [blame] | 151 | ALOGE("Can't find android/os/FileObserver$ObserverThread"); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 152 | return -1; |
| 153 | } |
| 154 | |
| 155 | method_onEvent = env->GetMethodID(clazz, "onEvent", "(IILjava/lang/String;)V"); |
| 156 | if (method_onEvent == NULL) |
| 157 | { |
Steve Block | 3762c31 | 2012-01-06 19:20:56 +0000 | [diff] [blame] | 158 | ALOGE("Can't find FileObserver.onEvent(int, int, String)"); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 159 | return -1; |
| 160 | } |
| 161 | |
| 162 | return AndroidRuntime::registerNativeMethods(env, "android/os/FileObserver$ObserverThread", sMethods, NELEM(sMethods)); |
| 163 | } |
| 164 | |
| 165 | } /* namespace android */ |