GLib와 GIO를 이용한 간단한 네트워크 서버와 클라이언트 예제

예전에 인터넷에서 우연히 발견한 GLib와 GIO를 이용한 간단한 네트워크 서버/클라이언트 예제이다. GLib의 이벤트 루프와 GIO의 네트워크 기능을 활용하여 서버를 개발하는 좋은 샘플이 될 것으로 기대한다.

서버 소스

#include <glib.h> #include <gio/gio.h>   static GInetAddress* get_localhost() {     /* No clean way to handle IPV6, short of guess/check */     GInetAddress* addr = g_inet_address_new_any(G_SOCKET_FAMILY_IPV4);     if (!addr) {         addr = g_inet_address_new_any(G_SOCKET_FAMILY_IPV6);     }     return addr; }   /* this function will get called everytime a client attempts to connect */ gboolean incoming_callback(GSocketService *service,                   GSocketConnection *connection,                   GObject *source_object,                   gpointer user_data) {     g_print("Received connection from client!\n");     GInputStream *istream = g_io_stream_get_input_stream(G_IO_STREAM(connection));     gchar message[1024];     g_input_stream_read(istream,                         message,                         1024,                         NULL,                         NULL);     g_print("Message was: \"%s\"\n", message);     return FALSE; }   int main(int argc, char **argv) {     /* initialize glib */     g_type_init();       /* initialize the thread system */     if (!g_thread_supported())         g_thread_init(NULL);       GError *error = NULL;       /* create a new socketservice */     GSocketService *service = g_threaded_socket_service_new(10);       /* create a new address */     GInetAddress *inet_addr = get_localhost();     GSocketAddress *sock_addr = g_inet_socket_address_new(inet_addr,                                                           1500); /* your port goes here */       /* connect to the address */     GSocketAddress* effective_addr;     g_socket_listener_add_address(G_SOCKET_LISTENER(service),                                   sock_addr,                                   G_SOCKET_TYPE_STREAM,                                   G_SOCKET_PROTOCOL_TCP,                                   NULL,                                   &amp;effective_addr,                                   &amp;error);       /* don't forget to check for errors */     if (error != NULL) {         g_error(error-&gt;message);     }       /* listen to the 'incoming' signal */     g_signal_connect(service,                      "incoming",                      G_CALLBACK(incoming_callback),                      NULL);       /* start the socket service */     g_socket_service_start(service);       /* enter mainloop */     g_print("Waiting for client!\n");     GMainLoop *loop = g_main_loop_new(NULL, FALSE);     g_main_loop_run(loop);     g_main_loop_unref(loop);       return 0; }

클라이언트 소스

#include <glib.h> #include <gio/gio.h>   int main(int argc, char **argv) {     /* initialize glib */     g_type_init();       GError *error = NULL;       /* create a new connection */     GSocketConnection *connection = NULL;     GSocketClient *client = g_socket_client_new();       /* connect to the host */     connection = g_socket_client_connect_to_host(client,                                                  (gchar *)"localhost",                                                  1500, /* your port goes here */                                                  NULL,                                                  &amp;error);       /* don't forget to check for errors */     if (error != NULL) {         g_error(error-&gt;message);     }     else {         g_print("Connection successful!\n");     }       /* use the connection */     GInputStream *istream = g_io_stream_get_input_stream(G_IO_STREAM(connection));     GOutputStream *ostream = g_io_stream_get_output_stream(G_IO_STREAM(connection));     g_output_stream_write(ostream,                           "Hello server!", /* your message goes here */                           13,              /* length of your message */                           NULL,                           &amp;error);       /* don't forget to check for errors */     if (error != NULL) {         g_error(error-&gt;message);     }       return 0; }