1 // Copyright (C) 2019 The Android Open Source Project 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #pragma once 16 17 #include <chrono> 18 #include <string> 19 20 namespace android { 21 namespace fs_mgr { 22 23 // Wait at most |relative_timeout| milliseconds for |path| to exist. dirname(path) 24 // must already exist. For example, to wait on /dev/block/dm-6, /dev/block must 25 // be a valid directory. 26 // 27 // If relative_timeout is std::chrono::milliseconds::max(), then the wait will 28 // block indefinitely. 29 bool WaitForFile(const std::string& path, const std::chrono::milliseconds relative_timeout); 30 31 // Wait at most |relative_timeout| milliseconds for |path| to stop existing. 32 // Note that this only returns true if the inode itself no longer exists, i.e., 33 // all outstanding file descriptors have been closed. 34 bool WaitForFileDeleted(const std::string& path, const std::chrono::milliseconds relative_timeout); 35 36 } // namespace fs_mgr 37 } // namespace android 38