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
android_os_StatFs_getBlockSize(JNIEnv * env,jobject thiz)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
android_os_StatFs_getBlockCount(JNIEnv * env,jobject thiz)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
android_os_StatFs_getFreeBlocks(JNIEnv * env,jobject thiz)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
android_os_StatFs_getAvailableBlocks(JNIEnv * env,jobject thiz)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
android_os_StatFs_native_restat(JNIEnv * env,jobject thiz,jstring path)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
android_os_StatFs_native_setup(JNIEnv * env,jobject thiz,jstring path)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
android_os_StatFs_native_finalize(JNIEnv * env,jobject thiz)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
register_android_os_StatFs(JNIEnv * env)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
164