1 /* ttt-server.c - tic-tac-toe game server
3 * Copyright © 2005 Carl Worth
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2, or (at your option)
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software Foundation,
17 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 * Author: Carl Worth <cworth@cworth.org>
24 #include "ttt-client.h"
25 #include "ttt-socket.h"
28 pthread_mutex_t mutex;
32 ttt_client_t **clients;
38 ttt_server_init (ttt_server_t *server)
40 pthread_mutex_init (&server->mutex, NULL);
42 server->next_client_id = 0;
44 server->clients = NULL;
45 server->clients_size = 0;
46 server->num_clients = 0;
50 ttt_server_create_client (ttt_server_t *server, int client_socket)
54 pthread_mutex_lock (&server->mutex);
56 client = ttt_client_create (server, client_socket,
57 server->next_client_id++);
59 printf ("Client %d has joined.\n", client->id);
61 server->num_clients++;
63 if (server->num_clients > server->clients_size) {
64 if (server->clients_size == 0)
65 server->clients_size = 1;
67 server->clients_size *= 2;
69 server->clients = xrealloc (server->clients,
70 server->clients_size * sizeof (ttt_client_t *));
73 server->clients [server->num_clients - 1] = client;
75 pthread_mutex_unlock (&server->mutex);
81 ttt_server_destroy_client (ttt_server_t *server, ttt_client_t *client)
85 pthread_mutex_lock (&server->mutex);
87 for (i = 0; i < server->num_clients; i++)
88 if (server->clients[i] == client)
91 assert (i < server->num_clients);
93 printf ("Client %d has left.\n", client->id);
95 memmove (&server->clients[i], &server->clients[i+1],
96 (server->num_clients - i - 1) * sizeof (ttt_client_t *));
98 server->num_clients--;
100 ttt_client_destroy (client);
102 pthread_mutex_unlock (&server->mutex);
106 _handle_client_requests_thread (void *closure)
108 ttt_client_t *client = closure;
109 ttt_server_t *server = client->server;
114 request = ttt_client_read_line (client);
118 ttt_server_broadcast (client->server, request);
121 ttt_server_destroy_client (server, client);
127 _accept_client (void *closure, int client_socket)
129 ttt_server_t *server = closure;
130 ttt_client_t *client;
133 client = ttt_server_create_client (server, client_socket);
135 err = pthread_create (&client->thread, NULL,
136 _handle_client_requests_thread, client);
138 fprintf (stderr, "Error: pthread_create failed: %s. Aborting.\n",
145 ttt_server_broadcast (ttt_server_t *server, const char *message)
149 pthread_mutex_lock (&server->mutex);
151 for (i = 0; i < server->num_clients; i++)
152 ttt_client_send (server->clients[i], message);
154 pthread_mutex_unlock (&server->mutex);
157 static const char *WELCOME_MESSAGE =
158 "Welcome to ttt-server. So far, this program is still a demonstration\n"
159 "TCP/IP server, acting something like a rather braindead chat server.\n"
160 "The server is currently listening on:\n"
162 "\nTo test this, simply connect one or more clients to that host and port.\n"
165 "\nOnce you have connected a client, the server will send each line of text\n"
166 "it receives to all connected clients. The server reports client joins and\n"
167 "departures on stdout.\n"
168 "\nNote that to terminate the telnet client you type Control-], then\n"
169 "<Enter>, then \"close\" (and <Enter>) at the \"telnet> \" prompt.\n"
172 "\nPS. At this point we're ready to leave the demonstration phase and to\n"
173 "begin implementing TTTP (tic-tac-toe protocol) as well as fixing the\n"
174 "protocol specifcation. We don't need a custom client to move forward on\n"
175 "the server (that is one of the ideas behind using a telnet-compatible\n"
176 "protocol), but a custom client would still be a fine project for a\n"
177 "motivated beginning programmer.\n\n";
180 main (int argc, char **argv)
186 ttt_args_parse (&args, argc, argv);
189 xfreopen (args.log_file, "a", stderr);
191 socket = ttt_socket_create_server (args.host, args.port);
193 printf (WELCOME_MESSAGE, args.host, args.port, args.host, args.port);
195 ttt_server_init (&server);
198 ttt_socket_accept (socket, _accept_client, &server);
200 /* We only reach here if something bad happened. */