Examples with StructStat android.system.StructStat used on opensource projects

Example 16 with StructStat

use of android.system.StructStat in project Conversations by siacs.

the class FileBackend method weOwnFileLollipop.

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private static boolean weOwnFileLollipop(Uri uri) {
    try {
        File file = new File(uri.getPath());
        FileDescriptor fd = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY).getFileDescriptor();
        StructStat st = Os.fstat(fd);
        return st.st_uid == android.os.Process.myUid();
    } catch (FileNotFoundException e) {
        return false;
    } catch (Exception e) {
        return true;
    }
}

Example 17 with StructStat

use of android.system.StructStat in project android_frameworks_base by crdroidandroid.

the class SharedPreferencesImpl method writeToFile.

// Note: must hold mWritingToDiskLock
private void writeToFile(MemoryCommitResult mcr, boolean isFromSyncCommit) {
    // Rename the current file so it may be used as a backup during the next read
    if (mFile.exists()) {
        boolean needsWrite = false;
        // Only need to write if the disk state is older than this commit
        if (mDiskStateGeneration < mcr.memoryStateGeneration) {
            if (isFromSyncCommit) {
                needsWrite = true;
            } else {
                synchronized (this) {
                    // be persisted.
                    if (mCurrentMemoryStateGeneration == mcr.memoryStateGeneration) {
                        needsWrite = true;
                    }
                }
            }
        }
        if (!needsWrite) {
            if (DEBUG) {
                Log.d(TAG, "skipped " + mcr.memoryStateGeneration + " -> " + mFile.getName());
            }
            mcr.setDiskWriteResult(true);
            return;
        }
        if (!mBackupFile.exists()) {
            if (!mFile.renameTo(mBackupFile)) {
                Log.e(TAG, "Couldn't rename file " + mFile + " to backup file " + mBackupFile);
                mcr.setDiskWriteResult(false);
                return;
            }
        } else {
            mFile.delete();
        }
    }
    // from the backup.
    try {
        FileOutputStream str = createFileOutputStream(mFile);
        if (str == null) {
            mcr.setDiskWriteResult(false);
            return;
        }
        XmlUtils.writeMapXml(mcr.mapToWriteToDisk, str);
        FileUtils.sync(str);
        if (DEBUG) {
            Log.d(TAG, "wrote " + mcr.memoryStateGeneration + " -> " + mFile.getName());
        }
        str.close();
        ContextImpl.setFilePermissionsFromMode(mFile.getPath(), mMode, 0);
        try {
            final StructStat stat = Os.stat(mFile.getPath());
            synchronized (this) {
                mStatTimestamp = stat.st_mtime;
                mStatSize = stat.st_size;
            }
        } catch (ErrnoException e) {
        // Do nothing
        }
        // Writing was successful, delete the backup file if there is one.
        mBackupFile.delete();
        mDiskStateGeneration = mcr.memoryStateGeneration;
        mcr.setDiskWriteResult(true);
        return;
    } catch (XmlPullParserException e) {
        Log.w(TAG, "writeToFile: Got exception:", e);
    } catch (IOException e) {
        Log.w(TAG, "writeToFile: Got exception:", e);
    }
    // Clean up an unsuccessfully written file
    if (mFile.exists()) {
        if (!mFile.delete()) {
            Log.e(TAG, "Couldn't clean up partially-written file " + mFile);
        }
    }
    mcr.setDiskWriteResult(false);
}

Example 18 with StructStat

use of android.system.StructStat in project android_frameworks_base by crdroidandroid.

the class SharedPreferencesImpl method hasFileChangedUnexpectedly.

// Has the file changed out from under us?  i.e. writes that
// we didn't instigate.
private boolean hasFileChangedUnexpectedly() {
    synchronized (this) {
        if (mDiskWritesInFlight > 0) {
            // If we know we caused it, it's not unexpected.
            if (DEBUG)
                Log.d(TAG, "disk write in flight, not unexpected.");
            return false;
        }
    }
    final StructStat stat;
    try {
        /*
             * Metadata operations don't usually count as a block guard
             * violation, but we explicitly want this one.
             */
        BlockGuard.getThreadPolicy().onReadFromDisk();
        stat = Os.stat(mFile.getPath());
    } catch (ErrnoException e) {
        return true;
    }
    synchronized (this) {
        return mStatTimestamp != stat.st_mtime || mStatSize != stat.st_size;
    }
}

Example 19 with StructStat

use of android.system.StructStat in project android_frameworks_base by crdroidandroid.

the class SharedPreferencesImpl method loadFromDisk.

private void loadFromDisk() {
    synchronized (SharedPreferencesImpl.this) {
        if (mLoaded) {
            return;
        }
        if (mBackupFile.exists()) {
            mFile.delete();
            mBackupFile.renameTo(mFile);
        }
    }
    // Debugging
    if (mFile.exists() && !mFile.canRead()) {
        Log.w(TAG, "Attempt to read preferences file " + mFile + " without permission");
    }
    Map map = null;
    StructStat stat = null;
    try {
        stat = Os.stat(mFile.getPath());
        if (mFile.canRead()) {
            BufferedInputStream str = null;
            try {
                str = new BufferedInputStream(new FileInputStream(mFile), 16 * 1024);
                map = XmlUtils.readMapXml(str);
            } catch (XmlPullParserException | IOException e) {
                Log.w(TAG, "getSharedPreferences", e);
            } finally {
                IoUtils.closeQuietly(str);
            }
        }
    } catch (ErrnoException e) {
    /* ignore */
    }
    synchronized (SharedPreferencesImpl.this) {
        mLoaded = true;
        if (map != null) {
            mMap = map;
            mStatTimestamp = stat.st_mtime;
            mStatSize = stat.st_size;
        } else {
            mMap = new HashMap<>();
        }
        notifyAll();
    }
}

Example 20 with StructStat

use of android.system.StructStat in project android_frameworks_base by crdroidandroid.

the class LocalTransport method performBackup.

@Override
public int performBackup(PackageInfo packageInfo, ParcelFileDescriptor data) {
    if (DEBUG) {
        try {
            StructStat ss = Os.fstat(data.getFileDescriptor());
            Log.v(TAG, "performBackup() pkg=" + packageInfo.packageName + " size=" + ss.st_size);
        } catch (ErrnoException e) {
            Log.w(TAG, "Unable to stat input file in performBackup() on " + packageInfo.packageName);
        }
    }
    File packageDir = new File(mCurrentSetIncrementalDir, packageInfo.packageName);
    packageDir.mkdirs();
    // Each 'record' in the restore set is kept in its own file, named by
    // the record key.  Wind through the data file, extracting individual
    // record operations and building a set of all the updates to apply
    // in this update.
    BackupDataInput changeSet = new BackupDataInput(data.getFileDescriptor());
    try {
        int bufSize = 512;
        byte[] buf = new byte[bufSize];
        while (changeSet.readNextHeader()) {
            String key = changeSet.getKey();
            String base64Key = new String(Base64.encode(key.getBytes()));
            File entityFile = new File(packageDir, base64Key);
            int dataSize = changeSet.getDataSize();
            if (DEBUG)
                Log.v(TAG, "Got change set key=" + key + " size=" + dataSize + " key64=" + base64Key);
            if (dataSize >= 0) {
                if (entityFile.exists()) {
                    entityFile.delete();
                }
                FileOutputStream entity = new FileOutputStream(entityFile);
                if (dataSize > bufSize) {
                    bufSize = dataSize;
                    buf = new byte[bufSize];
                }
                changeSet.readEntityData(buf, 0, dataSize);
                if (DEBUG) {
                    try {
                        long cur = Os.lseek(data.getFileDescriptor(), 0, SEEK_CUR);
                        Log.v(TAG, "  read entity data; new pos=" + cur);
                    } catch (ErrnoException e) {
                        Log.w(TAG, "Unable to stat input file in performBackup() on " + packageInfo.packageName);
                    }
                }
                try {
                    entity.write(buf, 0, dataSize);
                } catch (IOException e) {
                    Log.e(TAG, "Unable to update key file " + entityFile.getAbsolutePath());
                    return TRANSPORT_ERROR;
                } finally {
                    entity.close();
                }
            } else {
                entityFile.delete();
            }
        }
        return TRANSPORT_OK;
    } catch (IOException e) {
        // oops, something went wrong.  abort the operation and return error.
        Log.v(TAG, "Exception reading backup input:", e);
        return TRANSPORT_ERROR;
    }
}