C Class SocketServerServer

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

void error(char *msg)
{
  //peror(msg); //c11
  //exit(1);

}

int main(int argc, char *argv[]) {
  //initializing all empty variables, structs, and array
  int sockfd, newsockfd, portno, clilen, n;
  char buffer[256];
  struct sockaddr_in serv_addr, cli_addr;

  if(argc < 2)
  {
    fprintf(stderr,"Error, no port provided\n");
    //exit(1);
  }
  sockfd = socket(AF_INET, SOCK_STREAM,0);
  if(sockfd < 0)
  {
    error("Error opening socket");
  }
  //bzero((char *) &serv_addr,sizeof(serv_addr)); //this may not be necessary //c11
  portno = atoi(argv[1]);
  serv_addr.sin_family = AF_INET;
  serv_addr.sin_port = htons(portno);
  serv_addr.sin_addr.s_addr = INADDR_ANY;

  if(bind(sockfd,(struct sockaddr*) &serv_addr, sizeof(serv_addr)) < 0)
      {
        error("Error on binding");
      }
  listen(sockfd,5);
  clilen = sizeof(cli_addr);
  newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
  if (newsockfd < 0)
 {
    error("ERROR on accept");
  }
  bzero(buffer,256);
  n = read(newsockfd,buffer,255);

  if(n < 0)
  {
    error("Error reading from socket");
  }

  printf("Here is the message: %s\n", buffer);

  n = write(newsockfd, "I got your message", 18);
  if(n<0)
  {
    error("Error writing to socket");
  }
  return 0;
}