1 /* 2 * Copyright (C) 2018 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 <android/fdsan.h> 32 33 #include <errno.h> 34 #include <stdatomic.h> 35 #include <string.h> 36 #include <sys/cdefs.h> 37 #include <sys/mman.h> 38 #include <sys/resource.h> 39 #include <sys/user.h> 40 41 struct FdEntry { 42 _Atomic(uint64_t) close_tag = 0; 43 }; 44 45 struct FdTableOverflow { 46 size_t len = 0; 47 FdEntry entries[0]; 48 }; 49 50 template <size_t inline_fds> 51 struct FdTableImpl { FdTableImplFdTableImpl52 constexpr FdTableImpl() {} 53 54 uint32_t version = 0; // currently 0, and hopefully it'll stay that way. 55 _Atomic(android_fdsan_error_level) error_level = ANDROID_FDSAN_ERROR_LEVEL_DISABLED; 56 57 FdEntry entries[inline_fds]; 58 _Atomic(FdTableOverflow*) overflow = nullptr; 59 60 FdEntry* at(size_t idx); 61 }; 62 63 using FdTable = FdTableImpl<128>; 64