#include <stdio.h>
printf()

#include <stdlib.h>
malloc()
free()
NULL
atoi()
strtol()

#include <string.h>
strlen()
strcpy()
strtok()

#include <strings.h>
strcasecmp()
bzero()

#include <unistd.h>
close()

#include <inttypes.h>
uint8_t
uint16_t
uint32_t

#include <pthread.h>
pthread_t

#include <sys/uio.h>
recvfrom()
#include <sys/types.h>
#include <sys/socket.h>
bind()
sendto()
socket()
setsockopt()
#include <netinet/in.h>
#include <arpa/inet.h>
in_addr
inet_addr()
inet_ntoa()

#include <readline/readline.h>
#include <readline/history.h>
readline()