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 | |
Steven Moreland | 2279b25 | 2017-07-19 09:50:45 -0700 | [diff] [blame] | 18 | #include <nativehelper/JNIHelp.h> |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 19 | #include "jni.h" |
| 20 | #include "utils/Log.h" |
| 21 | #include "utils/misc.h" |
Andreas Gampe | ed6b9df | 2014-11-20 22:02:20 -0800 | [diff] [blame] | 22 | #include "core_jni_helpers.h" |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 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 | |
Yabin Cui | 20a9cf4 | 2014-11-10 15:43:18 -0800 | [diff] [blame] | 32 | #if defined(__linux__) |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 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 | { |
Yabin Cui | 20a9cf4 | 2014-11-10 15:43:18 -0800 | [diff] [blame] | 42 | #if defined(__linux__) |
Nick Kralevich | 4b3a08c | 2019-01-28 10:39:10 -0800 | [diff] [blame] | 43 | return (jint)inotify_init1(IN_CLOEXEC); |
Yabin Cui | 20a9cf4 | 2014-11-10 15:43:18 -0800 | [diff] [blame] | 44 | #else |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 45 | return -1; |
Yabin Cui | 20a9cf4 | 2014-11-10 15:43:18 -0800 | [diff] [blame] | 46 | #endif |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 47 | } |
| 48 | |
| 49 | static void android_os_fileobserver_observe(JNIEnv* env, jobject object, jint fd) |
| 50 | { |
Yabin Cui | 20a9cf4 | 2014-11-10 15:43:18 -0800 | [diff] [blame] | 51 | #if defined(__linux__) |
| 52 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 53 | char event_buf[512]; |
| 54 | struct inotify_event* event; |
Yabin Cui | 20a9cf4 | 2014-11-10 15:43:18 -0800 | [diff] [blame] | 55 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 56 | while (1) |
| 57 | { |
| 58 | int event_pos = 0; |
| 59 | int num_bytes = read(fd, event_buf, sizeof(event_buf)); |
Yabin Cui | 20a9cf4 | 2014-11-10 15:43:18 -0800 | [diff] [blame] | 60 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 61 | if (num_bytes < (int)sizeof(*event)) |
| 62 | { |
| 63 | if (errno == EINTR) |
| 64 | continue; |
| 65 | |
Steve Block | 3762c31 | 2012-01-06 19:20:56 +0000 | [diff] [blame] | 66 | 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] | 67 | return; |
| 68 | } |
Yabin Cui | 20a9cf4 | 2014-11-10 15:43:18 -0800 | [diff] [blame] | 69 | |
Mike Lockwood | 59d25d0 | 2010-02-18 07:01:28 -0500 | [diff] [blame] | 70 | while (num_bytes >= (int)sizeof(*event)) |
| 71 | { |
| 72 | int event_size; |
| 73 | event = (struct inotify_event *)(event_buf + event_pos); |
| 74 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 75 | jstring path = NULL; |
Yabin Cui | 20a9cf4 | 2014-11-10 15:43:18 -0800 | [diff] [blame] | 76 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 77 | if (event->len > 0) |
| 78 | { |
| 79 | path = env->NewStringUTF(event->name); |
| 80 | } |
Mike Lockwood | 59d25d0 | 2010-02-18 07:01:28 -0500 | [diff] [blame] | 81 | |
| 82 | env->CallVoidMethod(object, method_onEvent, event->wd, event->mask, path); |
| 83 | if (env->ExceptionCheck()) { |
| 84 | env->ExceptionDescribe(); |
| 85 | env->ExceptionClear(); |
| 86 | } |
The Android Open Source Project | b22d55b | 2009-03-05 15:45:10 -0800 | [diff] [blame] | 87 | if (path != NULL) |
| 88 | { |
| 89 | env->DeleteLocalRef(path); |
| 90 | } |
Mike Lockwood | 59d25d0 | 2010-02-18 07:01:28 -0500 | [diff] [blame] | 91 | |
| 92 | event_size = sizeof(*event) + event->len; |
| 93 | num_bytes -= event_size; |
| 94 | event_pos += event_size; |
| 95 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 96 | } |
Yabin Cui | 20a9cf4 | 2014-11-10 15:43:18 -0800 | [diff] [blame] | 97 | |
| 98 | #endif |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 99 | } |
| 100 | |
| 101 | static jint android_os_fileobserver_startWatching(JNIEnv* env, jobject object, jint fd, jstring pathString, jint mask) |
| 102 | { |
| 103 | int res = -1; |
Yabin Cui | 20a9cf4 | 2014-11-10 15:43:18 -0800 | [diff] [blame] | 104 | |
| 105 | #if defined(__linux__) |
| 106 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 107 | if (fd >= 0) |
| 108 | { |
| 109 | const char* path = env->GetStringUTFChars(pathString, NULL); |
Yabin Cui | 20a9cf4 | 2014-11-10 15:43:18 -0800 | [diff] [blame] | 110 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 111 | res = inotify_add_watch(fd, path, mask); |
Yabin Cui | 20a9cf4 | 2014-11-10 15:43:18 -0800 | [diff] [blame] | 112 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 113 | env->ReleaseStringUTFChars(pathString, path); |
| 114 | } |
| 115 | |
Yabin Cui | 20a9cf4 | 2014-11-10 15:43:18 -0800 | [diff] [blame] | 116 | #endif |
| 117 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 118 | return res; |
| 119 | } |
| 120 | |
| 121 | static void android_os_fileobserver_stopWatching(JNIEnv* env, jobject object, jint fd, jint wfd) |
| 122 | { |
Yabin Cui | 20a9cf4 | 2014-11-10 15:43:18 -0800 | [diff] [blame] | 123 | #if defined(__linux__) |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 124 | |
| 125 | inotify_rm_watch((int)fd, (uint32_t)wfd); |
| 126 | |
Yabin Cui | 20a9cf4 | 2014-11-10 15:43:18 -0800 | [diff] [blame] | 127 | #endif |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 128 | } |
| 129 | |
Daniel Micay | 76f6a86 | 2015-09-19 17:31:01 -0400 | [diff] [blame] | 130 | static const JNINativeMethod sMethods[] = { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 131 | /* name, signature, funcPtr */ |
| 132 | { "init", "()I", (void*)android_os_fileobserver_init }, |
| 133 | { "observe", "(I)V", (void*)android_os_fileobserver_observe }, |
| 134 | { "startWatching", "(ILjava/lang/String;I)I", (void*)android_os_fileobserver_startWatching }, |
| 135 | { "stopWatching", "(II)V", (void*)android_os_fileobserver_stopWatching } |
Yabin Cui | 20a9cf4 | 2014-11-10 15:43:18 -0800 | [diff] [blame] | 136 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 137 | }; |
| 138 | |
| 139 | int register_android_os_FileObserver(JNIEnv* env) |
| 140 | { |
Andreas Gampe | ed6b9df | 2014-11-20 22:02:20 -0800 | [diff] [blame] | 141 | jclass clazz = FindClassOrDie(env, "android/os/FileObserver$ObserverThread"); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 142 | |
Andreas Gampe | ed6b9df | 2014-11-20 22:02:20 -0800 | [diff] [blame] | 143 | method_onEvent = GetMethodIDOrDie(env, clazz, "onEvent", "(IILjava/lang/String;)V"); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 144 | |
Andreas Gampe | ed6b9df | 2014-11-20 22:02:20 -0800 | [diff] [blame] | 145 | return RegisterMethodsOrDie(env, "android/os/FileObserver$ObserverThread", sMethods, |
| 146 | NELEM(sMethods)); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 147 | } |
| 148 | |
| 149 | } /* namespace android */ |