Problems with this code, ab2 and sigint.

gistfile1.c

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

const char msg[] = "lol\n";
int sockfd;

void sigint(int signal)
{
  close(sockfd);
  exit(0);
}

void process(int socket)
{
  size_t len = 1024;
  ssize_t recv_len;
  char buffer[len];
  
  printf("recv\n");
  if( (recv_len = recv(socket, buffer, len, 0)) < 0)
  {
    perror("recv");
    close(socket);
    return;
  }
  printf("write\n");
  write(socket, msg, sizeof(msg)-1);
  printf("written\n");
  close(socket);
}


int main(int argc, char** argv)
{
  signal(SIGINT, sigint);
  if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) 
  {
    perror("socket");
  };
  struct sockaddr_in addr;
  memset(&addr, 0, sizeof(addr));
  addr.sin_family = AF_INET;
  addr.sin_port = htons(12345);
  if(inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr)<=0)
  {
    perror("inet_pton");
  }
  if(bind(sockfd, (struct sockaddr*)&addr, sizeof(addr)) < 0)
  {
    perror("bind");
  }
  if(listen(sockfd, 0) < 0)
  {
    perror("listen");
  }
  printf("%d\n", sockfd);
  for(;;)
  {
    printf("Accepting\n");
    int socket = accept(sockfd, NULL, 0);
    printf("Accepted\n");
    process(socket);
    printf("Processed\n");
  }
  return 0;
}