Implemented basic connection logic

connection.h

@@ -0,0 +1,55 @@
+#ifndef __CONNECTION_H
+#define __CONNECTION_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+// Add socket to managed sockets.
+// Parameters:
+//  - fd        - socket fd
+// Returns:
+//  - on success: ID of connection (>0)
+//  - on failure: 0
+// Remarks:
+//  - in case of success, you may forget about
+//    the socket you added because it is completely
+//    managed by this module
+//  - in case of failure you still need to close
+//    the socket
+//  - does not check if fd is already added
+uint32_t connection_add(int fd);
+
+// Cleanup.
+// Remarks:
+//  - closes all connections
+void connection_cleanup();
+
+// Check if socket is managed.
+// Parameters:
+//  - fd        - socket fd
+// Returns:
+//  - true if the socket is managed
+//  - false if the socket is not managed
+bool connection_is_socket_managed(int fd);
+
+// Handle socket events.
+// Parameters:
+//  - fd        - socket fd
+//  - events    - events as returned by epoll_wait
+// Returns:
+//  - true on success
+//  - false on failure
+// Remarks:
+//  - the app should be terminated if this function returns false
+void connection_event(int fd, uint32_t events);
+
+// Send data over connection.
+// Parameters:
+//  - id        - connection ID
+//  - data      - data to send
+//  - size      - size of data
+// Returns:
+//  - count of bytes sent
+uint32_t connection_send(uint32_t id, const void *data, uint32_t size);
+
+#endif