The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2007, The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #if INCLUDE_SYS_MOUNT_FOR_STATFS |
| 18 | #include <sys/mount.h> |
| 19 | #else |
| 20 | #include <sys/statfs.h> |
| 21 | #endif |
| 22 | |
| 23 | #include <errno.h> |
| 24 | |
| 25 | #include "jni.h" |
| 26 | #include "JNIHelp.h" |
| 27 | #include "android_runtime/AndroidRuntime.h" |
| 28 | |
| 29 | |
| 30 | namespace android |
| 31 | { |
| 32 | |
| 33 | // ---------------------------------------------------------------------------- |
| 34 | |
| 35 | struct fields_t { |
| 36 | jfieldID context; |
| 37 | }; |
| 38 | static fields_t fields; |
| 39 | |
| 40 | // ---------------------------------------------------------------------------- |
| 41 | |
| 42 | static jint |
| 43 | android_os_StatFs_getBlockSize(JNIEnv *env, jobject thiz) |
| 44 | { |
| 45 | struct statfs *stat = (struct statfs *)env->GetIntField(thiz, fields.context); |
| 46 | return stat->f_bsize; |
| 47 | } |
| 48 | |
| 49 | static jint |
| 50 | android_os_StatFs_getBlockCount(JNIEnv *env, jobject thiz) |
| 51 | { |
| 52 | struct statfs *stat = (struct statfs *)env->GetIntField(thiz, fields.context); |
| 53 | return stat->f_blocks; |
| 54 | } |
| 55 | |
| 56 | static jint |
| 57 | android_os_StatFs_getFreeBlocks(JNIEnv *env, jobject thiz) |
| 58 | { |
| 59 | struct statfs *stat = (struct statfs *)env->GetIntField(thiz, fields.context); |
| 60 | return stat->f_bfree; |
| 61 | } |
| 62 | |
| 63 | static jint |
| 64 | android_os_StatFs_getAvailableBlocks(JNIEnv *env, jobject thiz) |
| 65 | { |
| 66 | struct statfs *stat = (struct statfs *)env->GetIntField(thiz, fields.context); |
| 67 | return stat->f_bavail; |
| 68 | } |
| 69 | |
| 70 | static void |
| 71 | android_os_StatFs_native_restat(JNIEnv *env, jobject thiz, jstring path) |
| 72 | { |
| 73 | if (path == NULL) { |
| 74 | jniThrowException(env, "java/lang/IllegalArgumentException", NULL); |
| 75 | return; |
| 76 | } |
| 77 | |
| 78 | // get the object handle |
| 79 | struct statfs *stat = (struct statfs *)env->GetIntField(thiz, fields.context); |
| 80 | if (stat == NULL) { |
| 81 | jniThrowException(env, "java/lang/NoSuchFieldException", NULL); |
| 82 | return; |
| 83 | } |
| 84 | |
| 85 | const char* pathstr = env->GetStringUTFChars(path, NULL); |
| 86 | if (pathstr == NULL) { |
| 87 | jniThrowException(env, "java/lang/RuntimeException", "Out of memory"); |
| 88 | return; |
| 89 | } |
| 90 | |
| 91 | // note that stat will contain the new file data corresponding to |
| 92 | // pathstr |
| 93 | if (statfs(pathstr, stat) != 0) { |
| 94 | LOGE("statfs %s failed, errno: %d", pathstr, errno); |
| 95 | delete stat; |
| 96 | env->SetIntField(thiz, fields.context, 0); |
| 97 | jniThrowException(env, "java/lang/IllegalArgumentException", NULL); |
| 98 | } |
| 99 | // Release pathstr |
| 100 | env->ReleaseStringUTFChars(path, pathstr); |
| 101 | } |
| 102 | |
| 103 | static void |
| 104 | android_os_StatFs_native_setup(JNIEnv *env, jobject thiz, jstring path) |
| 105 | { |
| 106 | if (path == NULL) { |
| 107 | jniThrowException(env, "java/lang/IllegalArgumentException", NULL); |
| 108 | return; |
| 109 | } |
| 110 | |
| 111 | struct statfs* stat = new struct statfs; |
| 112 | if (stat == NULL) { |
| 113 | jniThrowException(env, "java/lang/RuntimeException", "Out of memory"); |
| 114 | return; |
| 115 | } |
| 116 | env->SetIntField(thiz, fields.context, (int)stat); |
| 117 | android_os_StatFs_native_restat(env, thiz, path); |
| 118 | } |
| 119 | |
| 120 | static void |
| 121 | android_os_StatFs_native_finalize(JNIEnv *env, jobject thiz) |
| 122 | { |
| 123 | struct statfs *stat = (struct statfs *)env->GetIntField(thiz, fields.context); |
| 124 | if (stat != NULL) { |
| 125 | delete stat; |
| 126 | env->SetIntField(thiz, fields.context, 0); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | // ---------------------------------------------------------------------------- |
| 131 | |
| 132 | static JNINativeMethod gMethods[] = { |
| 133 | {"getBlockSize", "()I", (void *)android_os_StatFs_getBlockSize}, |
| 134 | {"getBlockCount", "()I", (void *)android_os_StatFs_getBlockCount}, |
| 135 | {"getFreeBlocks", "()I", (void *)android_os_StatFs_getFreeBlocks}, |
| 136 | {"getAvailableBlocks", "()I", (void *)android_os_StatFs_getAvailableBlocks}, |
| 137 | {"native_setup", "(Ljava/lang/String;)V", (void *)android_os_StatFs_native_setup}, |
| 138 | {"native_finalize", "()V", (void *)android_os_StatFs_native_finalize}, |
| 139 | {"native_restat", "(Ljava/lang/String;)V", (void *)android_os_StatFs_native_restat}, |
| 140 | }; |
| 141 | |
| 142 | |
| 143 | int register_android_os_StatFs(JNIEnv *env) |
| 144 | { |
| 145 | jclass clazz; |
| 146 | |
| 147 | clazz = env->FindClass("android/os/StatFs"); |
| 148 | if (clazz == NULL) { |
| 149 | LOGE("Can't find android/os/StatFs"); |
| 150 | return -1; |
| 151 | } |
| 152 | |
| 153 | fields.context = env->GetFieldID(clazz, "mNativeContext", "I"); |
| 154 | if (fields.context == NULL) { |
| 155 | LOGE("Can't find StatFs.mNativeContext"); |
| 156 | return -1; |
| 157 | } |
| 158 | |
| 159 | return AndroidRuntime::registerNativeMethods(env, |
| 160 | "android/os/StatFs", gMethods, NELEM(gMethods)); |
| 161 | } |
| 162 | |
| 163 | } // namespace android |