| paul@93 | 1 | /* |
| paul@93 | 2 | * A resource offering support for creating contexts and opening files. |
| paul@93 | 3 | * |
| paul@93 | 4 | * Copyright (C) 2021 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@211 | 22 | #include <string.h> |
| paul@211 | 23 | |
| paul@10 | 24 | #include "opener_server.h" |
| paul@10 | 25 | #include "opener_resource.h" |
| paul@10 | 26 | #include "resource_server.h" |
| paul@9 | 27 | |
| paul@9 | 28 | /* Support for providing access to files. */ |
| paul@9 | 29 | |
| paul@224 | 30 | OpenerResource::OpenerResource(ResourceRegistry *registry) |
| paul@209 | 31 | : _registry(registry) |
| paul@9 | 32 | { |
| paul@9 | 33 | } |
| paul@9 | 34 | |
| paul@156 | 35 | OpenerResource::~OpenerResource() |
| paul@156 | 36 | { |
| paul@156 | 37 | } |
| paul@156 | 38 | |
| paul@10 | 39 | int OpenerResource::expected_items() |
| paul@9 | 40 | { |
| paul@10 | 41 | return Opener_expected_items; |
| paul@9 | 42 | } |
| paul@9 | 43 | |
| paul@10 | 44 | ipc_server_handler_type OpenerResource::handler() |
| paul@10 | 45 | { |
| paul@10 | 46 | return (ipc_server_handler_type) handle_Opener; |
| paul@10 | 47 | } |
| paul@10 | 48 | |
| paul@10 | 49 | |
| paul@10 | 50 | |
| paul@214 | 51 | /* Obtain the identifier for any active parent directory for a path. */ |
| paul@211 | 52 | |
| paul@214 | 53 | long OpenerResource::get_parent(const char *path, fileid_t *fileid) |
| paul@211 | 54 | { |
| paul@211 | 55 | char *sep = strrchr(path, (int) '/'); |
| paul@211 | 56 | long err; |
| paul@211 | 57 | |
| paul@211 | 58 | /* For top-level paths, use the empty string to get the root directory. |
| paul@211 | 59 | Otherwise, obtain the parent directory path to obtain the file |
| paul@211 | 60 | identifier. */ |
| paul@211 | 61 | |
| paul@211 | 62 | if (sep == NULL) |
| paul@214 | 63 | err = get_fileid("", 0, fileid); |
| paul@211 | 64 | else |
| paul@211 | 65 | { |
| paul@211 | 66 | char *parent = strndup(path, sep - path + 1); |
| paul@211 | 67 | |
| paul@211 | 68 | parent[sep - path] = '\0'; |
| paul@214 | 69 | err = get_fileid(parent, 0, fileid); |
| paul@211 | 70 | free(parent); |
| paul@211 | 71 | } |
| paul@211 | 72 | |
| paul@214 | 73 | return err; |
| paul@214 | 74 | } |
| paul@214 | 75 | |
| paul@214 | 76 | /* Obtain any active parent directory for a path, notifying its subscribers of |
| paul@214 | 77 | the file opening event. */ |
| paul@214 | 78 | |
| paul@214 | 79 | long OpenerResource::notify_parent(const char *path) |
| paul@214 | 80 | { |
| paul@220 | 81 | Provider *provider; |
| paul@214 | 82 | fileid_t fileid; |
| paul@214 | 83 | long err; |
| paul@214 | 84 | |
| paul@214 | 85 | err = get_parent(path, &fileid); |
| paul@214 | 86 | |
| paul@211 | 87 | if (err) |
| paul@211 | 88 | return err; |
| paul@211 | 89 | |
| paul@211 | 90 | /* Obtain the provider of the parent directory. */ |
| paul@211 | 91 | |
| paul@220 | 92 | err = _registry->find_provider(fileid, &provider); |
| paul@211 | 93 | |
| paul@211 | 94 | if (err) |
| paul@211 | 95 | return err; |
| paul@211 | 96 | |
| paul@211 | 97 | /* With any active provider, send a notification. |
| paul@211 | 98 | NOTE: This should also communicate which file was involved, probably |
| paul@211 | 99 | NOTE: using the file identifier of the opened file. */ |
| paul@211 | 100 | |
| paul@211 | 101 | provider->notify_all(NOTIFY_FILE_OPENED); |
| paul@211 | 102 | return L4_EOK; |
| paul@211 | 103 | } |
| paul@211 | 104 | |
| paul@211 | 105 | |
| paul@211 | 106 | |
| paul@205 | 107 | /* Return an object for the given path and flags. */ |
| paul@10 | 108 | |
| paul@171 | 109 | long OpenerResource::open(const char *path, flags_t flags, offset_t *size, |
| paul@171 | 110 | l4_cap_idx_t *cap, object_flags_t *object_flags) |
| paul@9 | 111 | { |
| paul@218 | 112 | Resource *resource; |
| paul@218 | 113 | long err = _registry->get_resource(this, path, flags, size, object_flags, &resource); |
| paul@156 | 114 | |
| paul@156 | 115 | if (err) |
| paul@156 | 116 | return err; |
| paul@156 | 117 | |
| paul@211 | 118 | /* Notify listeners subscribed to the parent of the opened object. */ |
| paul@211 | 119 | |
| paul@211 | 120 | notify_parent(path); |
| paul@211 | 121 | |
| paul@218 | 122 | /* Start a server for the resource. */ |
| paul@202 | 123 | |
| paul@218 | 124 | return ResourceServer(resource).start_thread(cap); |
| paul@9 | 125 | } |
| paul@9 | 126 | |
| paul@10 | 127 | |
| paul@10 | 128 | |
| paul@10 | 129 | /* Opener interface methods. */ |
| paul@10 | 130 | |
| paul@10 | 131 | long OpenerResource::context(l4_cap_idx_t *context) |
| paul@10 | 132 | { |
| paul@10 | 133 | OpenerContextResource *resource = new OpenerContextResource(this); |
| paul@10 | 134 | |
| paul@62 | 135 | /* Complete the initialisation and start a server in a new thread. |
| paul@120 | 136 | If the thread does not start, the resource will be finalised. */ |
| paul@10 | 137 | |
| paul@120 | 138 | return ResourceServer(resource).start_thread(context); |
| paul@10 | 139 | } |
| paul@10 | 140 | |
| paul@9 | 141 | // vim: tabstop=4 expandtab shiftwidth=4 |
