Linux implementation of TCP Socket

TCP Server:

# Include <iostream>

# Include <cstring>

# Include <sys/types. h>

# Include <sys/socket. h>

# Include <netinet/in. h>

# Include <errno. h>

# Define SRVPORT 10005

# Define CONNECT_NUM 5

# Define MAX_NUM 80

Using namespace std;

Int main (int argc, char * argv [])

{

Int aSock =-1, srcSock =-1;

Int nsvaddr =-1, cnt =-1;

Sockaddr_in sa, serverSockAddr;

Sockaddr srvSockAddr;

Memset (& srvSockAddr, 0, sizeof (srvSockAddr ));

ASock = socket (AF_INET, SOCK_STREAM, 0 );

If (aSock <0)

{

Cout <"Create srcSock Error! "<Endl;

Return 0;

}

Memset (& serverSockAddr, 0, sizeof (serverSockAddr ));

Memset (& sa, 0, sizeof (sa ));

Sa. sin_family = AF_INET;

Sa. sin_port = htons (u_short) SRVPORT );

Sa. sin_addr.s_addr = htonl (INADDR_ANY );

If (bind (aSock, (sockaddr *) & sa, sizeof (sa) <0)

{

Cout <"Bind Error! "<Endl;

Return 0;

}

If (listen (aSock, CONNECT_NUM) <0)

{

Cout <"Listen Error! "<Endl;

Return 0;

}

Cout <"Server has been opened:" <endl;

While (true)

{

Cnt =-1;

Nsvaddr = sizeof (sockaddr_in );

SrcSock = accept (aSock, (sockaddr *) & serverSockAddr, (socklen_t *) & nsvaddr );

If (srcSock <0)

{

Cout <"Server accept Error @" <endl;

Cout <"srcSock is:" <srcSock <endl;

Cout <"Error No is:" <errno <endl;

Perror ("server :");

Return 0;

}

Char szRevMeg [MAX_NUM] = {0 };

Char szSdMeg [MAX_NUM] = {"Hello World! "};

Cout <"Begin to read:" <endl;

Cnt = read (srcSock, szRevMeg, MAX_NUM );

If (cnt <0)

{

Cout <"Read Error! "<Endl;

Return 0; // Just to test

}

Cout <"cnt is:" <cnt <endl;

Cout <"Complete Read:" <endl;

Cout <szRevMeg <endl;

Cnt = write (srcSock, szSdMeg, strlen (szSdMeg) + 1 );

If (cnt <0)

{

Cout <"Write Error! "<Endl;

}

Cout <"Write Completed! "<Endl;

Close (srcSock );

Cout <endl;

}

Close (aSock );

Return 0;

}

TCP Client:

# Include <iostream>

# Include <cstring>

# Include <sys/types. h>

# Include <sys/socket. h>

# Include <netinet/in. h>

# Include <arpa/inet. h>

# Define PORT 10005

# Define SRVIP "127.0.0.1" // "222.26.209.141"

# Define RCVNUM 1024

Using namespace std;

Int main ()

{

Int clientSock, nRecvBytes =-1;

Sockaddr_in sa;

Char Buffer [RCVNUM] = {0 };

ClientSock = socket (AF_INET, SOCK_STREAM, 0 );

If (clientSock <0)

{

Cout <"Client Socket create error! "<Endl;

Return 0;

}

Memset (& sa, 0, sizeof (sa ));

Sa. sin_family = AF_INET;

Sa. sin_port = htons (PORT );

Sa. sin_addr.s_addr = inet_addr (SRVIP );

If (connect (clientSock, (sockaddr *) & sa, sizeof (sockaddr) <0)

{

Cout <"Connect Error! "<Endl;

Return 0;

}

Cout <"Client has been opened:" <endl;

Strcpy (Buffer, "Here client said: hello ");

Cout <"Begin to write:" <endl;

Write (clientSock, Buffer, strlen (Buffer) + 1 );

Cout <"Write completed" <endl;

Memset (Buffer, 0, sizeof (Buffer ));

If (nRecvBytes = read (clientSock, Buffer, RCVNUM) <0)

{

Cout <"Read Message Error! "<Endl;

Return 0;

}

Cout <"Server says:" <Buffer <endl;

Close (clientSock );

Cout <"End of file" <endl;

Return 0;

}