How can I create a threaded server program in c that will bind with the port giv

Question

How can I create a threaded server program in c that will bind with the port given as the argument when run? The TCP server program needs to be able to take requests from the port given as the argument when run. From a separate client program (that also will know the port), messages will be sent. The server program will use detached threads so that it can recieve and simultaneously respond to the incoming requests. When the message is recieved, the appropriate function is called and data is transmitted back to the client. The thread then terminates, but the parent thread remains listening for other requests from the port. Any suggestions?

Explanation / Answer

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

#define MAXLINE 4096 /*max text line length*/
#define SERV_PORT 3000 /*port*/

int
main(int argc, char **argv)
{
int sockfd;
struct sockaddr_in servaddr;
char sendline[MAXLINE], recvline[MAXLINE];

//basic check of the arguments
//additional checks can be inserted
if (argc !=2) {
  perror("Usage: TCPClient <IP address of the server");
  exit(1);
}

//Create a socket for the client
//If sockfd<0 there was an error in the creation of the socket
if ((sockfd = socket (AF_INET, SOCK_STREAM, 0)) <0) {
  perror("Problem in creating the socket");
  exit(2);
}

//Creation of the socket
memset(&servaddr, 0, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr= inet_addr(argv[1]);
servaddr.sin_port =  htons(SERV_PORT); //convert to big-endian order

//Connection of the client to the socket
if (connect(sockfd, (struct sockaddr *) &servaddr, sizeof(servaddr))<0) {
  perror("Problem in connecting to the server");
  exit(3);
}

while (fgets(sendline, MAXLINE, stdin) != NULL) {

  send(sockfd, sendline, strlen(sendline), 0);

  if (recv(sockfd, recvline, MAXLINE,0) == 0){
   //error: server terminated prematurely
   perror("The server terminated prematurely");
   exit(4);
  }
  printf("%s", "String received from the server: ");
  fputs(recvline, stdout);
}

exit(0);
}

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