X-Git-Url: https://git.cworth.org/git?p=ttt;a=blobdiff_plain;f=src%2Fttt-server.c;h=2bc3a529b51efca60af87679488e248facd84b46;hp=2cac1177209caf16d7cafb6b2394e384490352e0;hb=15672ac8305a1c5ba0d9bf6edabb0a194c30628e;hpb=152ea9285ef3804783540d46263a7fc9802bc7db diff --git a/src/ttt-server.c b/src/ttt-server.c index 2cac117..2bc3a52 100644 --- a/src/ttt-server.c +++ b/src/ttt-server.c @@ -1,4 +1,4 @@ -/* ttt.c - client-server tic-tac-toe game +/* ttt-server.c - tic-tac-toe game server * * Copyright © 2005 Carl Worth * @@ -20,61 +20,182 @@ */ #include "ttt.h" +#include "ttt-args.h" +#include "ttt-client.h" #include "ttt-socket.h" +struct _ttt_server { + pthread_mutex_t mutex; + + int next_client_id; + + ttt_client_t **clients; + int clients_size; + int num_clients; +}; + +static void +ttt_server_init (ttt_server_t *server) +{ + pthread_mutex_init (&server->mutex, NULL); + + server->next_client_id = 0; + + server->clients = NULL; + server->clients_size = 0; + server->num_clients = 0; +} + +static ttt_client_t * +ttt_server_create_client (ttt_server_t *server, int client_socket) +{ + ttt_client_t *client; + + pthread_mutex_lock (&server->mutex); + + client = ttt_client_create (server, client_socket, + server->next_client_id++); + + printf ("Client %d has joined.\n", client->id); + + server->num_clients++; + + if (server->num_clients > server->clients_size) { + if (server->clients_size == 0) + server->clients_size = 1; + else + server->clients_size *= 2; + + server->clients = xrealloc (server->clients, + server->clients_size * sizeof (ttt_client_t *)); + } + + server->clients [server->num_clients - 1] = client; + + pthread_mutex_unlock (&server->mutex); + + return client; +} + static void -ttt_dispatch (int connected_socket) +ttt_server_destroy_client (ttt_server_t *server, ttt_client_t *client) { -#define BUF_SIZE 1024 + int i; + + pthread_mutex_lock (&server->mutex); + + for (i = 0; i < server->num_clients; i++) + if (server->clients[i] == client) + break; + + assert (i < server->num_clients); + + printf ("Client %d has left.\n", client->id); + + memmove (&server->clients[i], &server->clients[i+1], + (server->num_clients - i - 1) * sizeof (ttt_client_t *)); + + server->num_clients--; + + ttt_client_destroy (client); + + pthread_mutex_unlock (&server->mutex); +} + +static void * +_handle_client_requests_thread (void *closure) +{ + ttt_client_t *client = closure; + ttt_server_t *server = client->server; + char *request; while (1) { - char buf[BUF_SIZE]; - int cnt; - cnt = read (connected_socket, buf, BUF_SIZE); - if (cnt == 0) + + request = ttt_client_read_line (client); + if (request == NULL) break; - write (0, buf, cnt); - write (connected_socket, buf, cnt); + + ttt_server_broadcast (client->server, request); } + + ttt_server_destroy_client (server, client); + + return (void *) 0; +} + +static void +_accept_client (void *closure, int client_socket) +{ + ttt_server_t *server = closure; + ttt_client_t *client; + int err; + + client = ttt_server_create_client (server, client_socket); + + err = pthread_create (&client->thread, NULL, + _handle_client_requests_thread, client); + if (err != 0) { + fprintf (stderr, "Error: pthread_create failed: %s. Aborting.\n", + strerror (err)); + exit (1); + } +} + +void +ttt_server_broadcast (ttt_server_t *server, const char *message) +{ + int i; + + pthread_mutex_lock (&server->mutex); + + for (i = 0; i < server->num_clients; i++) + ttt_client_send (server->clients[i], message); + + pthread_mutex_unlock (&server->mutex); } static const char *WELCOME_MESSAGE = -"Welcome to ttt-server. So far, this program is simply a demonstration\n" -"of a TCP/IP server that handles one client at a time. The server is\n" -"currently listening on:\n" +"Welcome to ttt-server. So far, this program is still a demonstration\n" +"TCP/IP server, acting something like a rather braindead chat server.\n" +"The server is currently listening on:\n" "\n %s:%s\n" -"\nTo test this program, simply connect a client to that host and port.\n" +"\nTo test this, simply connect one or more clients to that host and port.\n" "For example:\n" "\n telnet %s %s\n" -"\nOnce you have connected a client, the server will echo any characters\n" -"it receives back to the client as well as to stdout.\n" +"\nOnce you have connected a client, the server will send each line of text\n" +"it receives to all connected clients. The server reports client joins and\n" +"departures on stdout.\n" "\nNote that to terminate the telnet client you type Control-], then\n" ", then \"close\" (and ) at the \"telnet> \" prompt.\n" "\nHave fun!\n" "-Carl\n" -"\nPS. The server handles only one client at a time, but multiple clients\n" -"may be able to connect simultaneously. Subsequent clients will see no\n" -"output from the server until all previous clients exit.\n" -"\nExtending the server to fork a new process for each client would be a fun\n" -"project for a motivated student (as would writing a custom client program).\n\n"; +"\nPS. At this point we're ready to leave the demonstration phase and to\n" +"begin implementing TTTP (tic-tac-toe protocol) as well as fixing the\n" +"protocol specifcation. We don't need a custom client to move forward on\n" +"the server (that is one of the ideas behind using a telnet-compatible\n" +"protocol), but a custom client would still be a fine project for a\n" +"motivated beginning programmer.\n\n"; int main (int argc, char **argv) { ttt_args_t args; + ttt_server_t server; int socket; ttt_args_parse (&args, argc, argv); if (args.log_file) - stderr = xfreopen (args.log_file, "a", stderr); + xfreopen (args.log_file, "a", stderr); socket = ttt_socket_create_server (args.host, args.port); printf (WELCOME_MESSAGE, args.host, args.port, args.host, args.port); + ttt_server_init (&server); + while (1) - ttt_socket_accept (socket, ttt_dispatch); + ttt_socket_accept (socket, _accept_client, &server); /* We only reach here if something bad happened. */ return 1;