==============================MODULE39=====================================
|                                                                         |
|  The program examples' source codes have been arranged in the same      |
|  order that appeared in the Tutorial. This is unedited and unverified   |
|  compilation. Published as is basis for educational, reacretional and   |
|  brain teaser purposes. All trademarks, copyrights and IPs, wherever    |
|  exist, are the sole property of their respective owner and/or          |
|  holder. Any damage or loss by using the materials presented in this    |
|  tutorial is USER responsibility. Part or full distribution,            |
|  reproduction and modification is granted to any body.                  |
|     Copyright 2003-2005 © Tenouk, Inc. All rights reserved.		  |
|          Distributed through http://www.tenouk.com			        |
|        		                                                        |
|									                    |
===========================================================================

Compiled using gcc on Linux/Fedora Core 3 machine...

/*testpid.c*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>

int main (int argc, char **argv)
{
int i, pid;
pid = fork();

printf("Forking...the pid: %d\n", pid);
for (i = 0; i < 5; i++)
printf(" %d    %d\n", i, getpid());
if (pid)
wait(NULL);
return 0;
}

----------------------------------------------------------------------------

#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#define MYPORT 3334

int main()
{
int sockfd;  /*socket file descriptor*/
struct sockaddr_in my_addr;

sockfd = socket(AF_INET, SOCK_STREAM, 0);
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
  perror("Server-socket() error lol!");
  exit(1);
}
else
  printf("Server-socket() sockfd is OK...\n");

/* host byte order */
my_addr.sin_family = AF_INET;
/* short, network byte order */
my_addr.sin_port = htons(MYPORT);
my_addr.sin_addr.s_addr = INADDR_ANY;
/* zero the rest of the struct */
memset(&(my_addr.sin_zero), 0, 8);

if(bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1)
{
  perror("Server-bind() error lol!");
  exit(1);
}
else
  printf("Server-bind() is OK...\n");

/*....other codes....*/

return 0;
}

---------------------------------------------------------------------------------------------

#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define DEST_IP "127.0.0.1"
#define DEST_PORT 80

int main(int argc, char *argv[])
{
int sockfd;
/* will hold the destination addr */
struct sockaddr_in dest_addr;

sockfd = socket(AF_INET, SOCK_STREAM, 0);

if(sockfd == -1)
{
  perror("Client-socket() error lol!");
  exit(1);
}
else
  printf("Client-socket() sockfd is OK...\n");

/* host byte order */
dest_addr.sin_family = AF_INET;
/* short, network byte order */
dest_addr.sin_port = htons(DEST_PORT);
dest_addr.sin_addr.s_addr = inet_addr(DEST_IP);

/* zero the rest of the struct */
memset(&(dest_addr.sin_zero), 0, 8);

if(connect(sockfd, (struct sockaddr *)&dest_addr, sizeof(struct sockaddr)) == -1)
{
  perror("Client-connect() error lol");
  exit(1);
}
else
  printf("Client-connect() is OK...\n");

/*...other codes...*/

return 0;
}

--------------------------------------------------------------------------------------------

#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

/*the port users will be connecting to*/
#define MYPORT 3440
/* how many pending connections queue will hold */
#define BACKLOG 10

int main()
{
/* listen on sock_fd, new connection on new_fd */
int sockfd, new_fd;
/* my address information, address where I run this program */
struct sockaddr_in my_addr;
/* remote address information */
struct sockaddr_in their_addr;
int sin_size;

sockfd = socket(AF_INET, SOCK_STREAM, 0);
if(sockfd == -1)
{
  perror("socket() error lol!");
  exit(1);
}
else
  printf("socket() is OK...\n");

/* host byte order */
my_addr.sin_family = AF_INET;
/* short, network byte order */
my_addr.sin_port = htons(MYPORT);
/* auto-fill with my IP */
my_addr.sin_addr.s_addr = INADDR_ANY;

/* zero the rest of the struct */
memset(&(my_addr.sin_zero), 0, 8);

if(bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1)
{
  perror("bind() error lol!");
  exit(1);
}
else
  printf("bind() is OK...\n");

if(listen(sockfd, BACKLOG) == -1)
{
  perror("listen() error lol!");
  exit(1);
}
else
  printf("listen() is OK...\n");

/* ...other codes to read the received data... */

sin_size = sizeof(struct sockaddr_in);
new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size);

if(new_fd == -1)
  perror("accept() error lol!");
else
  printf("accept() is OK...\n");

/*.....other codes.......*/

close(new_fd);
close(sockfd);
return 0;
}

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