1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #pragma once 30 31 #include "private/bionic_lock.h" 32 33 #include "prop_area.h" 34 35 class ContextNode { 36 public: 37 ContextNode(const char* context, const char* filename) 38 : context_(context), pa_(nullptr), no_access_(false), filename_(filename) { 39 lock_.init(false); 40 } 41 ~ContextNode() { 42 Unmap(); 43 } 44 45 DISALLOW_COPY_AND_ASSIGN(ContextNode); 46 47 bool Open(bool access_rw, bool* fsetxattr_failed); 48 bool CheckAccessAndOpen(); 49 void ResetAccess(); 50 void Unmap(); 51 52 const char* context() const { 53 return context_; 54 } 55 prop_area* pa() { 56 return pa_; 57 } 58 59 private: 60 bool CheckAccess(); 61 62 Lock lock_; 63 const char* context_; 64 prop_area* pa_; 65 bool no_access_; 66 const char* filename_; 67 }; 68
