verifier/systemIpc.cpp

// For socket programming
#include <arpa/inet.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>

// Sets up a socket connected to the port passed as input - returns the socket FD on success and -1 on error.
// Also prints the errno on error.
int set_up_socket_connect(int port)
{
  int sock = 0;
  if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
  {
    printf("\n Error in socket call - errno is %d \n", errno);
    return -1;
  }

  struct sockaddr_in serv_addr;
  memset(&serv_addr, '0', sizeof(serv_addr));

  serv_addr.sin_family = AF_INET;
  serv_addr.sin_port = htons(port);

  // Convert IPv4 and IPv6 addresses from text to binary form
  if(inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr)<=0)
  {
    printf("\nError in inet_pton - errno is %d\n", errno);
    return -1;
  }

  if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
  {
    printf("\nError in connect - errno is %d \n", errno);
    return -1;
  }

  return sock;
}