epoll.h

#ifndef _EPOLL_H
#define _EPOLL_H

#include <sys/epoll.h>
#include "types.h"

// epoll_data_t is always a void pointer to a ddhcp_epoll_data struct.
typedef int (*ddhcpd_epoll_event_t)(epoll_data_t,ddhcp_config*);
typedef int (*ddhcpd_socket_init_t)(epoll_data_t,ddhcp_config*);

struct ddhcp_epoll_data {
  int fd;
  int interface_id;
  char* interface_name;
  void* data;
  ddhcpd_socket_init_t setup;
  ddhcpd_epoll_event_t epollin;
  ddhcpd_epoll_event_t epollhup;
};
typedef struct ddhcp_epoll_data ddhcp_epoll_data;

#define epoll_get_fd(data) (((ddhcp_epoll_data*) data.ptr)->fd)
#define epoll_data_free(data) (free(data.ptr))
#define epoll_data_call(data,method,config) data->method((epoll_data_t){.ptr=(void*)data},config)

/**
 * Initialize epoll socket.
 */
void epoll_init(ddhcp_config* config);

/**
 * Initializing a new ddhcp_epoll_data structure
 */
ddhcp_epoll_data* epoll_data_new(char* interface_name, ddhcpd_socket_init_t setup, ddhcpd_epoll_event_t epollin,ddhcpd_epoll_event_t epollhup);

/** 
 * Add a file descriptor to an epoll instance.
 */
void epoll_add_fd(int efd, ddhcp_epoll_data *data, uint32_t events,ddhcp_config* config);

/**
 * Remove a file descriptor from an epoll instance.
 */
void del_fd(int efd, int fd);

#endif