Use libcore Posix class for StatFs implementation (bdd23ae9) · Commits · e / os / android_frameworks_base

core/java/android/os/StatFs.java

+52 −34

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		@@ -16,59 +16,77 @@

		package android.os;

		import libcore.io.ErrnoException;
		import libcore.io.Libcore;
		import libcore.io.StructStatFs;

		/**
		* Retrieve overall information about the space on a filesystem. This is a
		* Wrapper for Unix statfs().
		* wrapper for Unix statfs().
		*/
		public class StatFs {
		private StructStatFs mStat;

		/**
		* Construct a new StatFs for looking at the stats of the
		* filesystem at <var>path</var>. Upon construction, the stat of
		* the file system will be performed, and the values retrieved available
		* from the methods on this class.
		* Construct a new StatFs for looking at the stats of the filesystem at
		* {@code path}. Upon construction, the stat of the file system will be
		* performed, and the values retrieved available from the methods on this
		* class.
		*
		* @param path A path in the desired file system to state.
		* @param path path in the desired file system to stat.
		*/
		public StatFs(String path) { native_setup(path); }
		public StatFs(String path) {
		mStat = doStat(path);
		}

		private static StructStatFs doStat(String path) {
		try {
		return Libcore.os.statfs(path);
		} catch (ErrnoException e) {
		throw new IllegalArgumentException("Invalid path: " + path, e);
		}
		}

		/**
		* Perform a restat of the file system referenced by this object. This
		* is the same as re-constructing the object with the same file system
		* path, and the new stat values are available upon return.
		* Perform a restat of the file system referenced by this object. This is
		* the same as re-constructing the object with the same file system path,
		* and the new stat values are available upon return.
		*/
		public void restat(String path) { native_restat(path); }

		@Override
		protected void finalize() { native_finalize(); }
		public void restat(String path) {
		mStat = doStat(path);
		}

		/**
		* The size, in bytes, of a block on the file system. This corresponds
		* to the Unix statfs.f_bsize field.
		* The size, in bytes, of a block on the file system. This corresponds to
		* the Unix {@code statfs.f_bsize} field.
		*/
		public native int getBlockSize();
		public int getBlockSize() {
		return (int) mStat.f_bsize;
		}

		/**
		* The total number of blocks on the file system. This corresponds
		* to the Unix statfs.f_blocks field.
		* The total number of blocks on the file system. This corresponds to the
		* Unix {@code statfs.f_blocks} field.
		*/
		public native int getBlockCount();
		public int getBlockCount() {
		return (int) mStat.f_blocks;
		}

		/**
		* The total number of blocks that are free on the file system, including
		* reserved blocks (that are not available to normal applications). This
		* corresponds to the Unix statfs.f_bfree field. Most applications will
		* want to use {@link #getAvailableBlocks()} instead.
		* corresponds to the Unix {@code statfs.f_bfree} field. Most applications
		* will want to use {@link #getAvailableBlocks()} instead.
		*/
		public native int getFreeBlocks();
		public int getFreeBlocks() {
		return (int) mStat.f_bfree;
		}

		/**
		* The number of blocks that are free on the file system and available to
		* applications. This corresponds to the Unix statfs.f_bavail field.
		* applications. This corresponds to the Unix {@code statfs.f_bavail} field.
		*/
		public native int getAvailableBlocks();

		private int mNativeContext;
		private native void native_restat(String path);
		private native void native_setup(String path);
		private native void native_finalize();
		public int getAvailableBlocks() {
		return (int) mStat.f_bavail;
		}
		}

core/jni/Android.mk

+0 −1

Original line number	Diff line number	Diff line
		@@ -67,7 +67,6 @@ LOCAL_SRC_FILES:= \
		android_os_ParcelFileDescriptor.cpp \
		android_os_Parcel.cpp \
		android_os_SELinux.cpp \
		android_os_StatFs.cpp \
		android_os_SystemClock.cpp \
		android_os_SystemProperties.cpp \
		android_os_Trace.cpp \

core/jni/android_os_StatFs.cpp

deleted100644 → 0

+0 −163

Original line number	Diff line number	Diff line
		/*
		* Copyright 2007, 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.
		*/

		#if INCLUDE_SYS_MOUNT_FOR_STATFS
		#include <sys/mount.h>
		#else
		#include <sys/statfs.h>
		#endif

		#include <errno.h>

		#include "jni.h"
		#include "JNIHelp.h"
		#include "android_runtime/AndroidRuntime.h"


		namespace android
		{

		// ----------------------------------------------------------------------------

		struct fields_t {
		jfieldID context;
		};
		static fields_t fields;

		// ----------------------------------------------------------------------------

		static jint
		android_os_StatFs_getBlockSize(JNIEnv *env, jobject thiz)
		{
		struct statfs stat = (struct statfs )env->GetIntField(thiz, fields.context);
		return stat->f_bsize;
		}

		static jint
		android_os_StatFs_getBlockCount(JNIEnv *env, jobject thiz)
		{
		struct statfs stat = (struct statfs )env->GetIntField(thiz, fields.context);
		return stat->f_blocks;
		}

		static jint
		android_os_StatFs_getFreeBlocks(JNIEnv *env, jobject thiz)
		{
		struct statfs stat = (struct statfs )env->GetIntField(thiz, fields.context);
		return stat->f_bfree;
		}

		static jint
		android_os_StatFs_getAvailableBlocks(JNIEnv *env, jobject thiz)
		{
		struct statfs stat = (struct statfs )env->GetIntField(thiz, fields.context);
		return stat->f_bavail;
		}

		static void
		android_os_StatFs_native_restat(JNIEnv *env, jobject thiz, jstring path)
		{
		if (path == NULL) {
		jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
		return;
		}

		// get the object handle
		struct statfs stat = (struct statfs )env->GetIntField(thiz, fields.context);
		if (stat == NULL) {
		jniThrowException(env, "java/lang/NoSuchFieldException", NULL);
		return;
		}

		const char* pathstr = env->GetStringUTFChars(path, NULL);
		if (pathstr == NULL) {
		jniThrowException(env, "java/lang/RuntimeException", "Out of memory");
		return;
		}

		// note that stat will contain the new file data corresponding to
		// pathstr
		if (statfs(pathstr, stat) != 0) {
		ALOGE("statfs %s failed, errno: %d", pathstr, errno);
		delete stat;
		env->SetIntField(thiz, fields.context, 0);
		jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
		}
		// Release pathstr
		env->ReleaseStringUTFChars(path, pathstr);
		}

		static void
		android_os_StatFs_native_setup(JNIEnv *env, jobject thiz, jstring path)
		{
		if (path == NULL) {
		jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
		return;
		}

		struct statfs* stat = new struct statfs;
		if (stat == NULL) {
		jniThrowException(env, "java/lang/RuntimeException", "Out of memory");
		return;
		}
		env->SetIntField(thiz, fields.context, (int)stat);
		android_os_StatFs_native_restat(env, thiz, path);
		}

		static void
		android_os_StatFs_native_finalize(JNIEnv *env, jobject thiz)
		{
		struct statfs stat = (struct statfs )env->GetIntField(thiz, fields.context);
		if (stat != NULL) {
		delete stat;
		env->SetIntField(thiz, fields.context, 0);
		}
		}

		// ----------------------------------------------------------------------------

		static JNINativeMethod gMethods[] = {
		{"getBlockSize", "()I", (void *)android_os_StatFs_getBlockSize},
		{"getBlockCount", "()I", (void *)android_os_StatFs_getBlockCount},
		{"getFreeBlocks", "()I", (void *)android_os_StatFs_getFreeBlocks},
		{"getAvailableBlocks", "()I", (void *)android_os_StatFs_getAvailableBlocks},
		{"native_setup", "(Ljava/lang/String;)V", (void *)android_os_StatFs_native_setup},
		{"native_finalize", "()V", (void *)android_os_StatFs_native_finalize},
		{"native_restat", "(Ljava/lang/String;)V", (void *)android_os_StatFs_native_restat},
		};


		int register_android_os_StatFs(JNIEnv *env)
		{
		jclass clazz;

		clazz = env->FindClass("android/os/StatFs");
		if (clazz == NULL) {
		ALOGE("Can't find android/os/StatFs");
		return -1;
		}

		fields.context = env->GetFieldID(clazz, "mNativeContext", "I");
		if (fields.context == NULL) {
		ALOGE("Can't find StatFs.mNativeContext");
		return -1;
		}

		return AndroidRuntime::registerNativeMethods(env,
		"android/os/StatFs", gMethods, NELEM(gMethods));
		}

		} // namespace android