Basic server listening loop.

Makefile

@@ -21,8 +21,8 @@ RM      := rm -f
 
 DEBUG   ?= 1
 
-COMMON_CFLAGS  := -std=$(STD) -Werror -Wextra -Wall -MMD -MP -I$(SRC_DIR) `pkg-config --cflags glib-2.0`
-COMMON_LDFLAGS := -std=$(STD) -lm `pkg-config --libs glib-2.0 sdl3 sdl3-image`
+COMMON_CFLAGS  := -std=$(STD) -Werror -Wextra -Wall -MMD -MP -I$(SRC_DIR) `pkg-config --cflags glib-2.0 gio-2.0`
+COMMON_LDFLAGS := -std=$(STD) -lm `pkg-config --libs glib-2.0 gio-2.0 sdl3 sdl3-image`
 
 ifeq ($(DEBUG),1)
 	COMMON_CFLAGS  += -g -DDEBUG

src/common/util.h

@@ -9,6 +9,8 @@
 #define UNUSED_2(arg, ...) (void) arg, UNUSED_3 (__VA_ARGS__, 0)
 #define UNUSED_3(arg, ...) (void) arg
 
+#define SERVER_DEFAULT_PORT 33666
+
 /*
 
   GLib log levels:

src/server/server.c

@@ -1,8 +1,114 @@
 #include <stdio.h>
+#include <common/util.h>
+#include <glib.h>
+#include <gio/gio.h>
 
 int
-main ()
+main (int argc, char *argv[])
 {
+#ifdef DEBUG
+  setenv ("G_MESSAGES_DEBUG", "all", 1);
+#endif
+
+  GError *error = NULL;
+  int PORT = SERVER_DEFAULT_PORT;
+  if (argc > 1)
+    {
+      PORT = atoi (argv[1]);
+      g_info ("Changed the listening port from default=%d to custom=%d",
+	      SERVER_DEFAULT_PORT, PORT);
+    }
+  GSocket *socket = g_socket_new (G_SOCKET_FAMILY_IPV4, G_SOCKET_TYPE_STREAM,
+				  G_SOCKET_PROTOCOL_TCP, &error);
+  if (!socket)
+    {
+      g_printerr ("Socket creation failed: %s\n", error->message);
+      g_clear_error (&error);
+      return -1;
+    }
+  else
+    {
+      g_info ("Created TCP socket.");
+    }
+
+  GInetAddress *addr = g_inet_address_new_any (G_SOCKET_FAMILY_IPV4);
+  GSocketAddress *sockaddr = g_inet_socket_address_new (addr, PORT);
+
+  if (!g_socket_bind (socket, sockaddr, TRUE, &error))
+    {
+      g_printerr ("Bind failed: %s\n", error->message);
+      g_clear_error (&error);
+      g_object_unref (socket);
+    }
+  else
+    {
+      g_info ("Bound TCP socket to port %d", PORT);
+    }
+
+  g_object_unref (addr);
+  g_object_unref (sockaddr);
+
+  if (!g_socket_listen (socket, &error))
+    {
+      g_printerr ("Listen failed: %s\n", error->message);
+      g_clear_error (&error);
+      g_object_unref (socket);
+      return -1;
+    }
+  else
+    {
+      g_info ("TCP socket is now listening");
+    }
+
+  g_info ("Listening...");
+  while (true)
+    {
+      GSocket *socket2 = g_socket_accept (socket, NULL, &error);
+      GSocketConnection *connection =
+	g_socket_connection_factory_create_connection (socket2);
+      if (!connection)
+	{
+	  g_printerr ("accept() failed: %s\n", error->message);
+	  g_clear_error (&error);
+	  continue;
+	}
+      else
+	{
+	  g_info ("New connection accepted");
+	}
+
+      GInputStream *istream =
+	g_io_stream_get_input_stream (G_IO_STREAM (connection));
+      gchar buffer[1024];
+      gssize n =
+	g_input_stream_read (istream, buffer, sizeof (buffer) - 1, NULL,
+			     &error);
+
+      if (n > 0)
+	{
+	  buffer[n] = '\0';
+	  g_print ("Received from client: %s\n", buffer);
+	}
+      else
+	{
+	  g_printerr ("Read error: %s\n", error->message);
+	  g_clear_error (&error);
+	}
+
+      GOutputStream *ostream =
+	g_io_stream_get_output_stream (G_IO_STREAM (connection));
+      const gchar *response =
+	"Hello from the librefront server. Not implemented!!";
+      g_output_stream_write (ostream, response, strlen (response), NULL,
+			     &error);
+      g_output_stream_flush (ostream, NULL, &error);
+
+      g_io_stream_close (G_IO_STREAM (connection), NULL, NULL);
+      g_object_unref (connection);
+      g_object_unref (socket2);
+    }
+
+  g_object_unref (socket);
   fprintf (stderr, "Server not implemented!\n");
   return -1;
 }