socket.c

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/* Sample UDP server */

#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "socket.h"


#define SOCKET_PORT 32000

static int socket_fd;
static struct sockaddr_in socket_server, socket_client;

void socket_init(int is_server)
{
  // Initialize socket
  if ((socket_fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
    perror("Socket: socket");
    exit(1);
  }

  bzero(&socket_server, sizeof(socket_server));
  socket_server.sin_family = AF_INET;
  socket_server.sin_port = htons(SOCKET_PORT);
  //inet_aton("192.168.1.69", &socket_server.sin_addr);
  inet_aton("127.0.0.1", &socket_server.sin_addr);

  if (is_server) {
    if (bind(socket_fd, (struct sockaddr *)&socket_server, sizeof(socket_server)) != 0) {
      perror("Socket: bind");
      exit(1);
    }
  }
}

int socket_recv(char *buffer, int len)
{
  socklen_t slen = sizeof(socket_server);
  return recvfrom(socket_fd, buffer, len, MSG_DONTWAIT, (struct sockaddr *)&socket_server, &slen);
}

void socket_send(char *buffer, int len)
{
  socklen_t slen = sizeof(socket_server);
  sendto(socket_fd, buffer, len, MSG_DONTWAIT, (struct sockaddr *)&socket_server, slen);
}