1 /* 2 * An opener for a "host" file provided via the C library. 3 * 4 * Copyright (C) 2021 Paul Boddie <paul@boddie.org.uk> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301, USA 20 */ 21 22 #pragma once 23 24 #include <map> 25 #include <mutex> 26 #include <string> 27 28 #include <fsserver/opener_resource.h> 29 30 31 32 /* Collection data types. */ 33 34 typedef std::map<std::string, fileid_t> HostFileIdentifiers; 35 36 37 38 /* Support for providing access to files. */ 39 40 class HostFileOpener : public OpenerResource 41 { 42 protected: 43 std::mutex _lock; 44 45 /* File identifier register. */ 46 47 HostFileIdentifiers _fileids; 48 49 virtual fileid_t _get_fileid(const char *path, bool create); 50 51 /* Convenience methods determining different object types. */ 52 53 virtual bool accessing_directory(const char *path, flags_t flags, fileid_t fileid); 54 55 virtual bool accessing_file(const char *path, flags_t flags, fileid_t fileid); 56 57 /* Convenience methods obtaining different pager types. */ 58 59 virtual long get_directory(const char *path, flags_t flags, fileid_t fileid, offset_t *size, l4_cap_idx_t *cap); 60 61 public: 62 explicit HostFileOpener(FilePaging *paging) 63 : OpenerResource(paging) 64 { 65 } 66 67 virtual ~HostFileOpener(); 68 69 /* Configurable methods. */ 70 71 virtual long get_fileid(const char *path, flags_t flags, fileid_t *fileid); 72 73 virtual long make_accessor(const char *path, flags_t flags, fileid_t fileid, Accessor **accessor); 74 }; 75 76 // vim: tabstop=4 expandtab shiftwidth=4