| paul@93 | 1 | /* |
| paul@93 | 2 | * An opener for a file employing a rewritable memory area. |
| paul@93 | 3 | * |
| paul@240 | 4 | * Copyright (C) 2021, 2022 Paul Boddie <paul@boddie.org.uk> |
| paul@93 | 5 | * |
| paul@93 | 6 | * This program is free software; you can redistribute it and/or |
| paul@93 | 7 | * modify it under the terms of the GNU General Public License as |
| paul@93 | 8 | * published by the Free Software Foundation; either version 2 of |
| paul@93 | 9 | * the License, or (at your option) any later version. |
| paul@93 | 10 | * |
| paul@93 | 11 | * This program is distributed in the hope that it will be useful, |
| paul@93 | 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| paul@93 | 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| paul@93 | 14 | * GNU General Public License for more details. |
| paul@93 | 15 | * |
| paul@93 | 16 | * You should have received a copy of the GNU General Public License |
| paul@93 | 17 | * along with this program; if not, write to the Free Software |
| paul@93 | 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| paul@93 | 19 | * Boston, MA 02110-1301, USA |
| paul@93 | 20 | */ |
| paul@93 | 21 | |
| paul@143 | 22 | #include <systypes/fcntl.h> |
| paul@143 | 23 | |
| paul@50 | 24 | #include "block_file_accessor.h" |
| paul@50 | 25 | #include "block_file_opener.h" |
| paul@50 | 26 | |
| paul@156 | 27 | BlockFileOpener::~BlockFileOpener() |
| paul@156 | 28 | { |
| paul@156 | 29 | } |
| paul@156 | 30 | |
| paul@143 | 31 | /* Return a file identifier for the given 'path'. */ |
| paul@143 | 32 | |
| paul@146 | 33 | long BlockFileOpener::get_fileid(const char *path, flags_t flags, fileid_t *fileid) |
| paul@143 | 34 | { |
| paul@143 | 35 | /* Obtain any registered identifier for the path. */ |
| paul@143 | 36 | |
| paul@146 | 37 | *fileid = _get_fileid(path, false); |
| paul@143 | 38 | |
| paul@146 | 39 | if (*fileid != FILEID_INVALID) |
| paul@146 | 40 | return L4_EOK; |
| paul@143 | 41 | |
| paul@143 | 42 | /* Test for a valid file or an attempt to create a file. */ |
| paul@143 | 43 | |
| paul@143 | 44 | FILE *fp = fopen(path, "r"); |
| paul@143 | 45 | |
| paul@143 | 46 | if (fp == NULL) |
| paul@143 | 47 | { |
| paul@143 | 48 | if (!(flags & O_CREAT)) |
| paul@146 | 49 | return -L4_ENOENT; |
| paul@143 | 50 | } |
| paul@143 | 51 | else |
| paul@143 | 52 | fclose(fp); |
| paul@143 | 53 | |
| paul@146 | 54 | *fileid = _get_fileid(path, true); |
| paul@146 | 55 | return L4_EOK; |
| paul@143 | 56 | } |
| paul@143 | 57 | |
| paul@50 | 58 | /* Return a new accessor for 'fileid'. */ |
| paul@50 | 59 | |
| paul@240 | 60 | long BlockFileOpener::make_accessor(flags_t flags, fileid_t fileid, |
| paul@240 | 61 | Accessor **accessor) |
| paul@50 | 62 | { |
| paul@240 | 63 | const char *path = _get_path(fileid); |
| paul@240 | 64 | |
| paul@240 | 65 | if (path == NULL) |
| paul@240 | 66 | return -L4_ENOENT; |
| paul@240 | 67 | |
| paul@106 | 68 | FILE *fp = fopen(path, "r"); |
| paul@50 | 69 | |
| paul@106 | 70 | if (fp == NULL) |
| paul@143 | 71 | { |
| paul@143 | 72 | if (flags & O_CREAT) |
| paul@143 | 73 | *accessor = new BlockFileAccessor(fileid); |
| paul@143 | 74 | else |
| paul@143 | 75 | return -L4_ENOENT; |
| paul@143 | 76 | } |
| paul@143 | 77 | else |
| paul@143 | 78 | *accessor = new BlockFileAccessor(fp, fileid); |
| paul@106 | 79 | |
| paul@143 | 80 | return L4_EOK; |
| paul@50 | 81 | } |
| paul@50 | 82 | |
| paul@50 | 83 | // vim: tabstop=4 expandtab shiftwidth=4 |
