How to Build WSO2 Carbon 4.2.0 Tutorial for a newbie

Hi all, in this post I am going to describe how to build WSO2 carbon from source. Now carbon is moving towards it's newest version carbon 5 (C5). 

prerequisites

1. Linux (Mine is Ubuntu 13.04)
2. Oracle Java 1.6 (1.7 is still not supported)
3. Apache Maven 3.0.5 (see post for installing apache maven)
4. Subversion

I assume that you have installed and configured all of the above and ready to build carbon. :)

Create a directory called carbon. Inside that folder create three directories called orbit, kernel and platform. If you need to build WSO2 carbon you first need to build orbit, kernel and the platform. You may be confused and wondering what is this orbit, kernel and platform is. Orbit is the third party external dependencies which needed for carbon. Kernel is the core part of the carbon which other wso2 products are run upon. Platform contains the other products of wso2.

carbon --- > orbit

            --- > kernel

            --- > platform

Ok first move into the orbit folder and checkout the source. To do so execute the following command.

svn checkout http://svn.wso2.org/repos/wso2/carbon/orbit/branches/4.2.0/

Then move into the kernel folder and checkout the source. To do so execute the following command.

svn checkout http://svn.wso2.org/repos/wso2/carbon/kernel/branches/4.2.0/

And finally move into the platform folder and checkout the platform source.

svn checkout http://svn.wso2.org/repos/wso2/carbon/platform/branches/turing/

Before building from source there are few settings to be applied. open the .bashrc file using the following command.

gedit /home/HOME_DIR/.bashrc

and append  the following lines.

MAVEN_OPTS=" -Xms512m -Xmx1024m -XX:MaxPermSize=1024m"
export MAVEN_OPTS

now build the following order; orbit -->  kernel and finally platform.
Move into the orbit folder and you'll see pom.xml file. Enter the following command to build the orbit.

mvn clean install -Dmaven.test.skip=true

Note that to complete the build you need to connect to the internet. Now that's it. There may be some build failures. Try updating the subversion and rebiuld.

In the next tutorial I'm going to explain how to debug the carbon kernel. See you until then.

How to install Apache Maven in Ubuntu 13.04

In this post I'm going to explain n how to setup apache maven on your ubuntu box. 

First Download the apache-maven-3.0.5-bin.tar.gz from the http://maven.apache.org/download.cgi website.

Then go to the downloaded folder and extract the downloaded bundle using the following command.

tar -zxf apache-maven-3.0.5-bin.tar.gz

Then copy that folder where ever you want in your computer. In this example I copy it to my home folder.

sudo cp -R apache-maven-3.0.5 /home/aruna

Then the final step is to create the symbolic link to the maven executable. Use the following command to create the symbolic link.
sudo ln -s /home/aruna//apache-maven-3.0.5/bin/mvn /usr/bin/mvn  

Now you are almost done and execute the following command to check the installation.

mvn –version  

Then you'll probably get the following output.

Apache Maven 3.0.5 (r01de14724cdef164cd33c7c8c2fe155faf9602da; 2013-02-19 19:21:28+0530)
Maven home: /home/aruna/apache-maven-3.0.5
Java version: 1.6.0_45, vendor: Sun Microsystems Inc.
Java home: /usr/lib/jvm/java-6-oracle/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.11.0-12-generic", arch: "amd64", family: "unix"

That's it and see you in another post.  :)

Enable Offline data in Google Maps for Android

Hi guys it's been long time since I wrote a blog post. So now in this post I'm going to explain how to use google maps data for offline usage. This will be very useful for people who is limit with their mobile data budgets.

So first we need ti install the application from the Google Play https://play.google.com/store/apps/details?id=com.google.android.apps.maps&hl=en

Then enable your wifi connection. This will take around 80 MB maximum for the selected map area.

Left Click --> Select Offline Maps. Select New Offline Map and Select the area you want offline data. The size will be vary according to your selection of area.

Now enjoy Google offline maps in your android device..

Non Blocking I/O using SELECT System Call in Linux

Today we are going to explore a very important system call in Linux, The Select system call. Select System call is use  when we need non blocking executions. The use of the select can be explained via an example code. Lets assume that we use a socket program with a server and few client programs. To accept and read from clients what will be your normal approach?.. Probably you are checking for new clients and the data from the existing clients and probably use a read system call. Here  the approach is blocking, the program is blocked for events. But using the select system call, it can be achieved in a non- blocking manner. Here we put the connected clients along with the server into a fd_set type variable. Then the select system  call is looking for any read events for each clients and read the data non bloc-kingly.

Lets see an example code for this scenario.

In this example there is a server which is binded to port 9999. and clients can be connected to that port. Then the server identify whether a new client or data from an existing  client. Select call will monitor the read_fds and act immediately for a change of a read file descriptor. There is a time out value for select system call.

In this example many clients are connected to the server and heart beats are send for the clients for every 3 seconds. And from the server we can send work(In this scenario messages) for clients. Then the clients work on those messages and send result to the server. We can non- bloc-kingly send data to clients and read data from clients using the select system call. :) 

Server.cpp

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289

#include <stdio.h> #include <stdlib.h> #include <cstring> #include <unistd.h> #include <sys/types.h> #include <sys/time.h> #include <sys/socket.h> #include <sys/select.h> #include <netinet/in.h> #include <arpa/inet.h> #include <netdb.h> #include <pthread.h> #include <time.h> #include "Data.h" #define PORT "9999" // port we're listening on #define MAX_MESSAGE_SIZE 50 // Maximum message size pthread_mutex_t mutexSync = PTHREAD_MUTEX_INITIALIZER; int signal =0; char Buffer[1024]; int Initialize(void); void *Communicate(void *); void *get_in_addr(struct sockaddr *sa); void AcceptNewClients(fd_set &master , int &fdmax ,int listener); void AcceptDataFromClients(int iClient , fd_set & master); void SendHeartBeats(int iListener , int iClient); void SendWorkForClients( int fdmax , int iListener , int iClient , int &signal); //**************************************************************************************************** int main(void) { pthread_t t; // char Buffer[256]; int iListenSockId = Initialize(); //Communicate(&iListenSockId); pthread_create(&t , NULL, Communicate , (void *)&iListenSockId); while(1) { printf("Enter a message to Send :: "); fgets(Buffer , 255 , stdin); pthread_mutex_lock(&mutexSync); signal++; //printf("Message is %s %d \n", Buffer , signal); pthread_mutex_unlock(&mutexSync); sleep(1); //memset(&Buffer[0], 0, sizeof(Buffer)); } return 0; } //**************************************************************************************************** int Initialize() { int listener ; // listening socket descriptor int rv ; struct addrinfo hints, *ai, *p; int yes=1; // for setsockopt() // get us a socket and bind it memset(&hints, 0, sizeof hints); hints.ai_family = AF_UNSPEC; hints.ai_socktype = SOCK_STREAM; hints.ai_flags = AI_PASSIVE; if ((rv = getaddrinfo(NULL, PORT, &hints, &ai)) != 0) { fprintf(stderr, "selectserver: %s\n", gai_strerror(rv)); exit(1); } for(p = ai; p != NULL; p = p->ai_next) { listener = socket(p->ai_family, p->ai_socktype, p->ai_protocol); if (listener < 0) { continue; } // lose the pesky "address already in use" error message setsockopt(listener, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)); if (bind(listener, p->ai_addr, p->ai_addrlen) < 0) { close(listener); continue; } break; } // if we got here, it means we didn't get bound if (p == NULL) { fprintf(stderr, "selectserver: failed to bind\n"); exit(2); } freeaddrinfo(ai); // all done with this // listen if (listen(listener, 10) == -1) { perror("listen"); exit(3); } return listener; } //**************************************************************************************************** void * Communicate(void * id) { int *iSockID = (int *) id; int listener = *iSockID; fd_set master; // master file descriptor list fd_set read_fds; // temp file descriptor list for select() read int fdmax; // maximum file descriptor number int i, j, rv; FD_ZERO(&master); // clear the master and temp sets FD_ZERO(&read_fds); // add the listener to the master set FD_SET(listener, &master); printf("Listener is %d \n" , listener); // keep track of the biggest file descriptor fdmax = listener; // so far, it's this one //accept 3 clients // main loop for(;;) { memcpy(&read_fds , &master , sizeof(master)); struct timeval tv; tv.tv_sec = 3; tv.tv_usec = 0; int iResult = select(fdmax+1, &read_fds, NULL, NULL, &tv) ; if (iResult == -1) { perror("select"); exit(4); } // ADD NEW CONNECTIONS READ FROM CONNECTIONS for(i = 0; i <= fdmax; i++) { if (FD_ISSET(i, &read_fds)) { if (i == listener) { AcceptNewClients(master , fdmax , listener ); } else { AcceptDataFromClients(i , master); } } } for(i = 0; i <= fdmax; i++) { //send work for clients SendWorkForClients(fdmax , listener , i , signal); //sending heart beats SendHeartBeats(listener , i ); } } return 0; } //**************************************************************************************************** void SendWorkForClients(int fdmax , int iListener , int iClient , int &signal) { if(signal == 1 && iClient != iListener && iClient > iListener) { //send data to some client; //printf("data send to CLIENT DUMMY \n"); //signal--; ServerData * data = new ServerData(); data->iType = 2; strcpy(data->cMessage , Buffer ); int numbytes = write( iClient , data ,sizeof(*data)); printf("Number of bytes written :: %d ID :: %d \n" , numbytes , iClient); delete data; } if(signal == 1 && iClient != iListener && iClient > iListener && iClient == fdmax) { pthread_mutex_lock(&mutexSync); signal--; pthread_mutex_unlock(&mutexSync); } } //**************************************************************************************************** void SendHeartBeats(int iListener , int iClient) { ServerData * data = new ServerData(); time_t rawtime; time ( &rawtime ); data->iType = 1; strcpy(data->cMessage , ctime (&rawtime) ); //char cHeartBeat [] = "HEARTBEAT"; if(iClient!= iListener && iClient > iListener){ int numbytes = write( iClient , data , sizeof(*data)); //printf("Number of bytes written :: %d ID :: %d \n" , numbytes , i); } delete data; } //**************************************************************************************************** void AcceptNewClients(fd_set& master , int& fdmax ,int listener) { socklen_t addrlen; struct sockaddr_storage remoteaddr; // client address char remoteIP[INET6_ADDRSTRLEN]; int newfd; // newly accept()ed socket descriptor addrlen = sizeof(remoteaddr); ServerData * data = new ServerData(); data->iType = 2; strcpy(data->cMessage , "SERVER MESSAGE :: ACCEPTED" ); newfd = accept(listener, (struct sockaddr *)&remoteaddr, &addrlen); write(newfd , data , sizeof(*data)); if (newfd == -1) { perror("accept"); }else { FD_SET(newfd, &master); // add to master set if (newfd > fdmax) { // keep track of the max fdmax = newfd; } printf("selectserver: new connection from %s on socket %d\n", inet_ntop(remoteaddr.ss_family, get_in_addr((struct sockaddr*)&remoteaddr), remoteIP, INET6_ADDRSTRLEN), newfd); } delete data; } //**************************************************************************************************** void AcceptDataFromClients(int iClient , fd_set& master) { char buf[1024]; // buffer for client data int nbytes; nbytes = recv(iClient, buf, sizeof buf, 0); //printf("DISCONNECTING %d \n", nbytes); if (nbytes <= 0) { // got error or connection closed by client if (nbytes == 0) { // connection closed printf("selectserver: socket %d hung up\n", iClient); } else { perror("recv"); } close(iClient); // bye! FD_CLR(iClient, &master); // remove from master set } else { // we got some data from a client printf("CLIENT DATA :: %s",buf); } } //**************************************************************************************************** // get sockaddr, IPv4 or IPv6: void *get_in_addr(struct sockaddr *sa) { if (sa->sa_family == AF_INET) { return &(((struct sockaddr_in*)sa)->sin_addr); } return &(((struct sockaddr_in6*)sa)->sin6_addr); }

Client.cpp

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94

#include <stdio.h> #include <sys/socket.h> #include <stdlib.h> #include <sys/types.h> #include <netinet/in.h> #include <netdb.h> #include <string.h> #include <unistd.h> #include "Data.h" int main(int argc , char * argv []) { int SockFD , PortNo , n , fdmax ,nbytes; struct sockaddr_in Server_Address; struct hostent *Server; fd_set master; // master file descriptor list fd_set read_fds; // temp file descriptor list for select() FD_ZERO(&master); // clear the master and temp sets FD_ZERO(&read_fds); char Buffer[1024]; memset(Buffer, 0, sizeof(Buffer)); if(argc < 3) { printf("Error hostname port required \n"); exit(0); } PortNo = atoi(argv[2]); // create a socket SockFD = socket(AF_INET , SOCK_STREAM , 0); if(SockFD < 0 ) { perror("Error Creating Socket"); exit(1); } Server = (struct hostent *) gethostbyname(argv[1]); if(Server == NULL) { printf("Error :: No Such Host \n"); exit(0); } bzero((char *) &Server_Address , sizeof(Server_Address)); Server_Address.sin_family = AF_INET; bcopy((char *) Server->h_addr , (char *) &Server_Address.sin_addr.s_addr , Server->h_length); Server_Address.sin_port = htons(PortNo); //connect to the server int listener = connect(SockFD , (struct sockaddr *) &Server_Address , sizeof(Server_Address)); if( listener < 0) { perror("Error Connecting \n"); exit(1); } while(1) { n = read(SockFD , Buffer , sizeof(Buffer)); ServerData * data = new ServerData(); data = (ServerData *) Buffer; if(n <= 0) { perror("Error receiving data \n"); exit(1); } //int result = strcmp( Buffer, "HEARTBEAT" ); if(data->iType == 2) { //sleep(1); printf("Received :: %s", data->cMessage); write(SockFD , "CLIENT MESSAGE-->ACCEPTED" ,26); } else if(data->iType == 1 ) { //sleep(2); printf("Heart Beating Server:: %s", data->cMessage); } memset(Buffer, 0, sizeof(Buffer)); // } return 0; }

Data.h

1 2 3 4 5 6 7 8 9 10

// Header file for data // type 1 -> Heart Beat Message // type 2 -> Server Task Message class ServerData { public: int iType; char cMessage [50]; };

To compile and run the server...

1 2 3

g++ Select.cpp -lpthread ./a.out

To compile and run the client...

1 2 3

g++ -o client client.cpp ./client localhost 9999

That's it folks. If you have anything to clarify just put a comment. I'll answer for the best of my knowledge.

Here is a nice tutorial for Linux system calls. I recommend you all to read it.
http://www.beej.us/guide/bgnet/output/html/multipage/index.html

Producer Consumer Problem in C++

Today I'm going to solve a most common problem which is known as the consumer producer problem. In this context we have a shared buffer which the producers produce and the consumers consume. The consumers and producers are threads which will simultaneously produce and consume. There are some conditions to be met where consumers have to wait until producers produce, and another thing is that when the buffer is full producers must halt until the consumers consume.

In the following example was implemented using pthreads. The producer produce a random number to the buffer and consumers consume that number. Mutex locks are used to protect the shared buffer. 

ProducerConsumer.cpp     DOWNLOAD SOURCE

#include <iostream>
#include <pthread.h>
#include <vector>
#include <cstdlib>
#include <stdlib.h>
#include <stdio.h>
#include <pthread.h>
#include <semaphore.h>
#include <string.h>



#define BUFFER_SIZE 10

void InitializeData();
void *Produce(void *);
void *Consume(void *);
int InsertItem(int);
int RemoveItem(int *);

int iCounter;
pthread_mutex_t mutex;
sem_t full, empty;

int buffer[BUFFER_SIZE];



int main(int argc , char * argv[])
{
 InitializeData(); 
 pthread_t ProducerThread , ConsumerThread;
 int *aa = new int [10];
 for(int i = 0 ; i < 10 ; i++)
 {
  aa[i] = i;
  pthread_t t;
  pthread_create(&t , NULL, Produce , &aa[i]);
  printf("Creating Producer %d \n", i);
 }
 int *bb = new int[10];
 for(int i = 0 ; i < 10 ; i++)
 {
  bb[i] = i;
  pthread_t t;
  pthread_create(&t , NULL, Consume , &bb[i]);
  printf("Creating Consumer %d \n", i);
 }
 
 sleep(5);
 delete [] aa;
 delete [] bb;
 

 return 0;
}

//****************************************************************************************************
void InitializeData()
{
 pthread_mutex_init(&mutex , NULL);
 sem_init(&full , 0 ,0);
 sem_init(&empty , 0 , BUFFER_SIZE);
 
 iCounter = 0;
 

}

//****************************************************************************************************
void * Produce(void * Param)
{
 int item;
 
 while(1)
 {
  //sleep(1);
  item = rand() % 100;
  sem_wait(&empty);
  pthread_mutex_lock(&mutex);
  int iMsg = InsertItem(item);
  
  if(iMsg == -1){
   printf("Error Inserting Item \n");
  }else
  {
   printf("Produced Item :: %d  Thread No :: %d\n", item , *((int *)Param));
  }
  pthread_mutex_unlock(&mutex);
  sem_post(&full);
  
 }
}

//****************************************************************************************************
void * Consume(void * Param)
{
 int item;
 
 while(1)
 {
  //sleep(1);
  sem_wait(&full);
  pthread_mutex_lock(&mutex);
  int iMsg = RemoveItem(&item);
  
  if(iMsg == -1){
   printf("Error Removing Item \n");
  }else
  {
   printf("Consumed Item :: %d  Thread No :: %d \n", item ,*((int *)Param));
  }
  pthread_mutex_unlock(&mutex);
  sem_post(&empty);
  
 }
}

//****************************************************************************************************
int InsertItem(int item)
{
 if(iCounter < BUFFER_SIZE)
 {
  buffer[iCounter] =  item;
  iCounter++;
  return 1;
 }
 else{
  return -1;
 }

}

//****************************************************************************************************
int RemoveItem(int *item)
{
 if(iCounter > 0)
 {
  *item = buffer[iCounter - 1];
  iCounter--;
  return 1;
 }
 else{
  return -1;
 }
}

That's it folks. Hope to see you soon in another exciting tutorial.

How to send Complex Data Structures in a Socket Program

Hi all, Hope you guys are doing well. I was busy with my work last few days. Today I'm going to write a post about sending Complex data structures using a socket program. In this post I assume that you are somewhat familiar with the socket programming basics.

In the following example we are creating a Object type in the server program and send that to the client program. This is a simple serialize and deserialize mechanism to send complex data structures through a socket program using only the STL library. If you want more complex and complete functionality you might try the boost library. 

Here we are going to send the following data structure.
 Data.h File

class InnerData{
    public:
    int c;
};

class Data{
    public:
    int a;
    char b[20];
    InnerData id;
  
};

Now we write the Server program which will create a socket, bind that socket to a port and listen for incoming connections. If there is a incoming connection accept the connection, serialize the data send to the connected client.

Server.cpp File

#include <stdio.h>
#include <cstdlib> 
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <unistd.h>
#include <iostream>
#include <arpa/inet.h> 
#include "Data.h"

int main(int argc , char * argv [])
{
    int SockFD , NewSockFD , PortNo, Clilen;
    char Buffer[1024];
 struct sockaddr_in Server_Addr , Cli_Addr;
 int n , pID;

 //create a socket
 SockFD =  socket(AF_INET , SOCK_STREAM , 0);
 if(SockFD < 0)
 {
  perror("Error Creating Socket \n");
  exit(1);
 }
 std::cout << "Socket Created..." << std::endl;

 bzero((char *) &Server_Addr , sizeof(Server_Addr));
 PortNo = atoi(argv[1]);
 Server_Addr.sin_family = AF_INET;
 Server_Addr.sin_addr.s_addr = INADDR_ANY;
 Server_Addr.sin_port = htons(PortNo);

 
 //bind the socket
 if(bind(SockFD , (struct sockaddr *) &Server_Addr , sizeof(Server_Addr)) < 0)
 {
  perror("Error Binding \n");
  exit(1);
 }
 std::cout << "Socket Binded..." << std::endl;
 //listen for incoming clients
 listen(SockFD , 5);
 Clilen =  sizeof(Cli_Addr);
 std::cout << "Waiting For Connections..." << std::endl;
 
 while(1)
 {
  //accept a client 
  NewSockFD = accept(SockFD , (struct sockaddr *) &Cli_Addr ,(socklen_t *) &Clilen);
  printf("New Client %d \n", NewSockFD);
  if(NewSockFD < 0)
  {
   perror("Error accepting \n");
   exit(1);
  }  
   bzero(Buffer , 1024);
   printf("New Client Connected, Process ID :: %d \n",pID);
   //create the Data
   Data *data = new Data();
   data->a = 23232;
   strcpy(data->b , "TEST MESSAGE" );
   data->id.c =1000;
  
   n =  write(NewSockFD , data ,sizeof(*data) );
   if(n < 0)
   {
    perror(" Error Sending Message \n");
    exit(1);
   }
  
 }
 return 0;
}

Now the client accept the data send by the client and deserialize it.

Client.cpp

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


int main(int argc , char * argv [])
{
 int SockFD , PortNo , n;
 struct sockaddr_in Server_Address;
 struct hostent *Server;
 
 char Buffer[1024]; // Buffer to read data

 if(argc < 3)
 {
  printf("Error hostname port required \n");
  exit(0);
 }
 PortNo = atoi(argv[2]);
 // create a socket 
 SockFD =  socket(AF_INET , SOCK_STREAM , 0);

 if(SockFD < 0 )
 {
  perror("Error Creating Socket");
  exit(1);
 }
 
 Server = (struct hostent *) gethostbyname(argv[1]);
 if(Server == NULL)
 {
  printf("Error :: No Such Host \n");
  exit(0);
 }

 bzero((char *) &Server_Address , sizeof(Server_Address));
 Server_Address.sin_family =  AF_INET;
 bcopy((char *) Server->h_addr , (char *) &Server_Address.sin_addr.s_addr , Server->h_length);
 
 Server_Address.sin_port = htons(PortNo);
 
 //connect to the server
 if(connect(SockFD , (struct sockaddr *) &Server_Address , sizeof(Server_Address)) < 0)
 {
  perror("Error Connecting \n");
  exit(1);
 }
 Data * data = new Data();
 n = read(SockFD , Buffer , sizeof(Data));
 data = (Data *) Buffer;
 printf("Read Size %d \n" , n);
 if(n < 0)
 {
  perror("Error receiving data \n");
  exit(1);
 }
 printf("Received :: ID :: %d  MESSAGE :: %s Complex ID:: %d \n", data->a , data->b ,data->id.c );
 bzero(Buffer , 1024);

 return 0;

}

First we compile the Server.cpp file

g++ -o Server Server.cpp

Then we run the server giving the port as an argument.

./Server  7788

Then compile and run the client program using a new terminal.

g++ -o Client Client.cpp

./Client localhost 7788

That's it folks. It's a simple approach. But solve the problem. Remember that this only works since we are using the same computer architecture. If you are using different architectures you have to consider about the endian problem also.. :)