C/C++ 인터넷 Linux C++ Socket Example with Client Server and Mulit-Threading

2014.02.17 13:33

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Linux C++ Socket Example with Client Server and Mulit-Threading

Aim

 

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[출처] http://www.tidytutorials.com/2010/06/linux-c-socket-example-with-client.html


The aim of this Linux C++ example is to create simple client/server socket communication and multi-threading program on Linux. This shows the basics such as binding, listening and accepting sockets for Servers and connecting sockets for clients. Once the server accepts a socket, a thread is spawned to handle it. The threads are C++ POSIX threads. This is the simplest Linux C++ multi-threaded socket example you can find. Please leave any comments or questions at the end of this tutorial and I will endeavour to answer them. For a forking server look at Linux C++ Forking Server and Client Example.

Assumptions
This article assumes that you have a Linux based C++ compiler installed and configured. You can use cygwin if you do not have a Linux environment.

Versions used in this example
Sofware/Component Image
Fedora Core 5 N/A



[소스 다운로드] => LinSocket.zip
Steps required for a server socket

  1. Initialize the socket using socket().
  2. Set any options such as blocking etc using setsockopt().
  3. Bind to the local address and port using bind(). For a server use INADDR_ANY as the address.
  4. listen() for connections.
  5. Go into a loop and accept connections usin accept(). Spawn threads (pthread_create) to handle these connections, so you can accept more connections.
      Read and write to the socket. within the thread.
    • close()
    • When you are done, close the server socket using close()

    Steps required for a client socket
    1. Initialize the socket using socket().
    2. Set any options such as blocking etc using setsockopt().
    3. Connect to the remote host using connet(). Supply address and port here. Read and write to the socket. close()

    Write and compile the Server
    1. The server listens on port 1101 for a connection. When it receives a connection it creates a thread via pthread_create to handle it. This thread then reads from the socket, appends " SERVER ECHO" to it and sends it back to the client. As the server doesn't require an IP address, we assign INADDR_ANY to the sockaddr_in struct. Save this code as LinSever.cpp. 
       1. #include <fcntl.h>
 2. #include <string.h>
 3. #include <stdlib.h>
 4. #include <errno.h>
 5. #include <stdio.h>
 6. #include <netinet/in.h>
 7. #include <resolv.h>
 8. #include <sys/socket.h>
 9. #include <arpa/inet.h>
10. #include <unistd.h>
11. #include <pthread.h>
12. 
13. void* SocketHandler(void*);
14. 
15. int main(int argv, char** argc){
16. 
17.     int host_port= 1101;
18. 
19.     struct sockaddr_in my_addr;
20. 
21.     int hsock;
22.     int * p_int ;
23.     int err;
24. 
25.     socklen_t addr_size = 0;
26.     int* csock;
27.     sockaddr_in sadr;
28.     pthread_t thread_id=0;
29. 
30. 
31.     hsock = socket(AF_INET, SOCK_STREAM, 0);
32.     if(hsock == -1){
33.         printf("Error initializing socket %d\n", errno);
34.         goto FINISH;
35.     }
36.     
37.     p_int = (int*)malloc(sizeof(int));
38.     *p_int = 1;
39.         
40.     if( (setsockopt(hsock, SOL_SOCKET, SO_REUSEADDR, (char*)p_int, sizeof(int)) == -1 )||
41.         (setsockopt(hsock, SOL_SOCKET, SO_KEEPALIVE, (char*)p_int, sizeof(int)) == -1 ) ){
42.         printf("Error setting options %d\n", errno);
43.         free(p_int);
44.         goto FINISH;
45.     }
46.     free(p_int);
47. 
48.     my_addr.sin_family = AF_INET ;
49.     my_addr.sin_port = htons(host_port);
50.     
51.     memset(&(my_addr.sin_zero), 0, 8);
52.     my_addr.sin_addr.s_addr = INADDR_ANY ;
53.     
54.     if( bind( hsock, (sockaddr*)&my_addr, sizeof(my_addr)) == -1 ){
55.         fprintf(stderr,"Error binding to socket, make sure nothing else is listening on this port %d\n",errno);
56.         goto FINISH;
57.     }
58.     if(listen( hsock, 10) == -1 ){
59.         fprintf(stderr, "Error listening %d\n",errno);
60.         goto FINISH;
61.     }
62. 
63.     //Now lets do the server stuff
64. 
65.     addr_size = sizeof(sockaddr_in);
66.     
67.     while(true){
68.         printf("waiting for a connection\n");
69.         csock = (int*)malloc(sizeof(int));
70.         if((*csock = accept( hsock, (sockaddr*)&sadr, &addr_size))!= -1){
71.             printf("---------------------\nReceived connection from %s\n",inet_ntoa(sadr.sin_addr));
72.             pthread_create(&thread_id,0,&SocketHandler, (void*)csock );
73.             pthread_detach(thread_id);
74.         }
75.         else{
76.             fprintf(stderr, "Error accepting %d\n", errno);
77.         }
78.     }
79.     
80. FINISH:
81. ;
82. }
83. 
84. void* SocketHandler(void* lp){
85.     int *csock = (int*)lp;
86. 
87.     char buffer[1024];
88.     int buffer_len = 1024;
89.     int bytecount;
90. 
91.     memset(buffer, 0, buffer_len);
92.     if((bytecount = recv(*csock, buffer, buffer_len, 0))== -1){
93.         fprintf(stderr, "Error receiving data %d\n", errno);
94.         goto FINISH;
95.     }
96.     printf("Received bytes %d\nReceived string \"%s\"\n", bytecount, buffer);
97.     strcat(buffer, " SERVER ECHO");
98. 
99.     if((bytecount = send(*csock, buffer, strlen(buffer), 0))== -1){
100.         fprintf(stderr, "Error sending data %d\n", errno);
101.         goto FINISH;
102.     }
103.     
104.     printf("Sent bytes %d\n", bytecount);
105. 
106. 
107. FINISH:
108.     free(csock);
109.     return 0;
110. }
      Hide line numbers

    2. Open a prompt to the working directory and compile the code using your C++ compiler

      ..workspace\SocketExample>g++ -o server LinServer.cpp -lpthread

    Write and compile the Client
    1. The client reads a line from the console and sends this to the server. It then reads from the server and displays it on the console. Save this code as LinClient.cpp. 
       1. #include <fcntl.h>
 2. #include <string.h>
 3. #include <stdlib.h>
 4. #include <errno.h>
 5. #include <stdio.h>
 6. #include <netinet/in.h>
 7. #include <resolv.h>
 8. #include <sys/socket.h>
 9. #include <arpa/inet.h>
10. #include <unistd.h>
11. 
12. int main(int argv, char** argc){
13. 
14.     int host_port= 1101;
15.     char* host_name="127.0.0.1";
16. 
17.     struct sockaddr_in my_addr;
18. 
19.     char buffer[1024];
20.     int bytecount;
21.     int buffer_len=0;
22. 
23.     int hsock;
24.     int * p_int;
25.     int err;
26. 
27.     hsock = socket(AF_INET, SOCK_STREAM, 0);
28.     if(hsock == -1){
29.         printf("Error initializing socket %d\n",errno);
30.         goto FINISH;
31.     }
32.     
33.     p_int = (int*)malloc(sizeof(int));
34.     *p_int = 1;
35.         
36.     if( (setsockopt(hsock, SOL_SOCKET, SO_REUSEADDR, (char*)p_int, sizeof(int)) == -1 )||
37.         (setsockopt(hsock, SOL_SOCKET, SO_KEEPALIVE, (char*)p_int, sizeof(int)) == -1 ) ){
38.         printf("Error setting options %d\n",errno);
39.         free(p_int);
40.         goto FINISH;
41.     }
42.     free(p_int);
43. 
44.     my_addr.sin_family = AF_INET ;
45.     my_addr.sin_port = htons(host_port);
46.     
47.     memset(&(my_addr.sin_zero), 0, 8);
48.     my_addr.sin_addr.s_addr = inet_addr(host_name);
49. 
50.     if( connect( hsock, (struct sockaddr*)&my_addr, sizeof(my_addr)) == -1 ){
51.         if((err = errno) != EINPROGRESS){
52.             fprintf(stderr, "Error connecting socket %d\n", errno);
53.             goto FINISH;
54.         }
55.     }
56. 
57.     //Now lets do the client related stuff
58. 
59.     buffer_len = 1024;
60. 
61.     memset(buffer, '
       
      


       
      


       
      


       
      


      Linux C++ Socket Example with Client Server and Mulit-Threading 
      

      

      

      Aim
      

       
      


      [출처] http://www.tidytutorials.com/2010/06/linux-c-socket-example-with-client.html
      



      The aim of this Linux C++ example is to create simple client/server socket communication and multi-threading program on Linux. This shows the basics such as binding, listening and accepting sockets for Servers and connecting sockets for clients. Once the server accepts a socket, a thread is spawned to handle it. The threads are C++ POSIX threads. This is the simplest Linux C++ multi-threaded socket example you can find. Please leave any comments or questions at the end of this tutorial and I will endeavour to answer them. For a forking server look at Linux C++ Forking Server and Client Example.

      Assumptions
      This article assumes that you have a Linux based C++ compiler installed and configured. You can use cygwin if you do not have a Linux environment.

      Versions used in this example
      

      

      


      
Sofware/Component
Image
      

      
Fedora Core 5
N/A
      



      [소스 다운로드] => LinSocket.zip 
      Steps required for a server socket
      

      

        

      1. Initialize the socket using socket(). 

      2. Set any options such as blocking etc using setsockopt(). 

      3. Bind to the local address and port using bind(). For a server use INADDR_ANY as the address. 

      4. listen() for connections. 

      5. Go into a loop and accept connections usin accept(). Spawn threads (pthread_create) to handle these connections, so you can accept more connections. 
        

          Read and write to the socket. within the thread. 

        • close() 

        • When you are done, close the server socket using close() 

        Steps required for a client socket
        

          

        1. Initialize the socket using socket(). 

        2. Set any options such as blocking etc using setsockopt(). 

        3. Connect to the remote host using connet(). Supply address and port here. Read and write to the socket. close() 

        Write and compile the Server
        

          

        1. The server listens on port 1101 for a connection. When it receives a connection it creates a thread via pthread_create to handle it. This thread then reads from the socket, appends " SERVER ECHO" to it and sends it back to the client. As the server doesn't require an IP address, we assign INADDR_ANY to the sockaddr_in struct. Save this code as LinSever.cpp. 
          

          


          

           1. #include <fcntl.h>
 2. #include <string.h>
 3. #include <stdlib.h>
 4. #include <errno.h>
 5. #include <stdio.h>
 6. #include <netinet/in.h>
 7. #include <resolv.h>
 8. #include <sys/socket.h>
 9. #include <arpa/inet.h>
10. #include <unistd.h>
11. #include <pthread.h>
12. 
13. void* SocketHandler(void*);
14. 
15. int main(int argv, char** argc){
16. 
17.     int host_port= 1101;
18. 
19.     struct sockaddr_in my_addr;
20. 
21.     int hsock;
22.     int * p_int ;
23.     int err;
24. 
25.     socklen_t addr_size = 0;
26.     int* csock;
27.     sockaddr_in sadr;
28.     pthread_t thread_id=0;
29. 
30. 
31.     hsock = socket(AF_INET, SOCK_STREAM, 0);
32.     if(hsock == -1){
33.         printf("Error initializing socket %d\n", errno);
34.         goto FINISH;
35.     }
36.     
37.     p_int = (int*)malloc(sizeof(int));
38.     *p_int = 1;
39.         
40.     if( (setsockopt(hsock, SOL_SOCKET, SO_REUSEADDR, (char*)p_int, sizeof(int)) == -1 )||
41.         (setsockopt(hsock, SOL_SOCKET, SO_KEEPALIVE, (char*)p_int, sizeof(int)) == -1 ) ){
42.         printf("Error setting options %d\n", errno);
43.         free(p_int);
44.         goto FINISH;
45.     }
46.     free(p_int);
47. 
48.     my_addr.sin_family = AF_INET ;
49.     my_addr.sin_port = htons(host_port);
50.     
51.     memset(&(my_addr.sin_zero), 0, 8);
52.     my_addr.sin_addr.s_addr = INADDR_ANY ;
53.     
54.     if( bind( hsock, (sockaddr*)&my_addr, sizeof(my_addr)) == -1 ){
55.         fprintf(stderr,"Error binding to socket, make sure nothing else is listening on this port %d\n",errno);
56.         goto FINISH;
57.     }
58.     if(listen( hsock, 10) == -1 ){
59.         fprintf(stderr, "Error listening %d\n",errno);
60.         goto FINISH;
61.     }
62. 
63.     //Now lets do the server stuff
64. 
65.     addr_size = sizeof(sockaddr_in);
66.     
67.     while(true){
68.         printf("waiting for a connection\n");
69.         csock = (int*)malloc(sizeof(int));
70.         if((*csock = accept( hsock, (sockaddr*)&sadr, &addr_size))!= -1){
71.             printf("---------------------\nReceived connection from %s\n",inet_ntoa(sadr.sin_addr));
72.             pthread_create(&thread_id,0,&SocketHandler, (void*)csock );
73.             pthread_detach(thread_id);
74.         }
75.         else{
76.             fprintf(stderr, "Error accepting %d\n", errno);
77.         }
78.     }
79.     
80. FINISH:
81. ;
82. }
83. 
84. void* SocketHandler(void* lp){
85.     int *csock = (int*)lp;
86. 
87.     char buffer[1024];
88.     int buffer_len = 1024;
89.     int bytecount;
90. 
91.     memset(buffer, 0, buffer_len);
92.     if((bytecount = recv(*csock, buffer, buffer_len, 0))== -1){
93.         fprintf(stderr, "Error receiving data %d\n", errno);
94.         goto FINISH;
95.     }
96.     printf("Received bytes %d\nReceived string \"%s\"\n", bytecount, buffer);
97.     strcat(buffer, " SERVER ECHO");
98. 
99.     if((bytecount = send(*csock, buffer, strlen(buffer), 0))== -1){
100.         fprintf(stderr, "Error sending data %d\n", errno);
101.         goto FINISH;
102.     }
103.     
104.     printf("Sent bytes %d\n", bytecount);
105. 
106. 
107. FINISH:
108.     free(csock);
109.     return 0;
110. }
          Hide line numbers 

          

        2. Open a prompt to the working directory and compile the code using your C++ compiler 

          


          

          ..workspace\SocketExample>g++ -o server LinServer.cpp -lpthread 

        Write and compile the Client
        

          

        1. The client reads a line from the console and sends this to the server. It then reads from the server and displays it on the console. Save this code as LinClient.cpp. 
          

          


          

           1. #include <fcntl.h>
 2. #include <string.h>
 3. #include <stdlib.h>
 4. #include <errno.h>
 5. #include <stdio.h>
 6. #include <netinet/in.h>
 7. #include <resolv.h>
 8. #include <sys/socket.h>
 9. #include <arpa/inet.h>
10. #include <unistd.h>
11. 
12. int main(int argv, char** argc){
13. 
14.     int host_port= 1101;
15.     char* host_name="127.0.0.1";
16. 
17.     struct sockaddr_in my_addr;
18. 
19.     char buffer[1024];
20.     int bytecount;
21.     int buffer_len=0;
22. 
23.     int hsock;
24.     int * p_int;
25.     int err;
26. 
27.     hsock = socket(AF_INET, SOCK_STREAM, 0);
28.     if(hsock == -1){
29.         printf("Error initializing socket %d\n",errno);
30.         goto FINISH;
31.     }
32.     
33.     p_int = (int*)malloc(sizeof(int));
34.     *p_int = 1;
35.         
36.     if( (setsockopt(hsock, SOL_SOCKET, SO_REUSEADDR, (char*)p_int, sizeof(int)) == -1 )||
37.         (setsockopt(hsock, SOL_SOCKET, SO_KEEPALIVE, (char*)p_int, sizeof(int)) == -1 ) ){
38.         printf("Error setting options %d\n",errno);
39.         free(p_int);
40.         goto FINISH;
41.     }
42.     free(p_int);
43. 
44.     my_addr.sin_family = AF_INET ;
45.     my_addr.sin_port = htons(host_port);
46.     
47.     memset(&(my_addr.sin_zero), 0, 8);
48.     my_addr.sin_addr.s_addr = inet_addr(host_name);
49. 
50.     if( connect( hsock, (struct sockaddr*)&my_addr, sizeof(my_addr)) == -1 ){
51.         if((err = errno) != EINPROGRESS){
52.             fprintf(stderr, "Error connecting socket %d\n", errno);
53.             goto FINISH;
54.         }
55.     }
56. 
57.     //Now lets do the client related stuff
58. 
59.     buffer_len = 1024;
60. 
61.     memset(buffer, '\0', buffer_len);
62. 
63.     printf("Enter some text to send to the server (press enter)\n");
64.     fgets(buffer, 1024, stdin);
65.     buffer[strlen(buffer)-1]='\0';
66.     
67.     if( (bytecount=send(hsock, buffer, strlen(buffer),0))== -1){
68.         fprintf(stderr, "Error sending data %d\n", errno);
69.         goto FINISH;
70.     }
71.     printf("Sent bytes %d\n", bytecount);
72. 
73.     if((bytecount = recv(hsock, buffer, buffer_len, 0))== -1){
74.         fprintf(stderr, "Error receiving data %d\n", errno);
75.         goto FINISH;
76.     }
77.     printf("Recieved bytes %d\nReceived string \"%s\"\n", bytecount, buffer);
78. 
79.     close(hsock);
80.     
81. FINISH:
82. ;
83. }
          Hide line numbers 

          

        2. Open a prompt to the working directory and compile the code using your C++ compiler 

          


          

          ..workspace\SocketExample>g++ -o client LinClient.cpp 


        Run the example
        

          

        1. Open a prompt to the working directory and run the server. 
          

          


          

          ..workspace\SocketExample>server 

          

        2. Open another prompt to the working directory and run the Client. 
          

          


          

          ..workspace\SocketExample>client 

          

        3. Now type something into the client prompt and press ENTER. 

        4. You will see the exchange between client and server. You can open many client prompts at the same time and test. 
        

         
        


         
        


         
        ', buffer_len);
62. 
63.     printf("Enter some text to send to the server (press enter)\n");
64.     fgets(buffer, 1024, stdin);
65.     buffer[strlen(buffer)-1]='
         
        


         
        


         
        


         
        


        Linux C++ Socket Example with Client Server and Mulit-Threading 
        

        

        

        Aim
        

         
        


        [출처] http://www.tidytutorials.com/2010/06/linux-c-socket-example-with-client.html
        



        The aim of this Linux C++ example is to create simple client/server socket communication and multi-threading program on Linux. This shows the basics such as binding, listening and accepting sockets for Servers and connecting sockets for clients. Once the server accepts a socket, a thread is spawned to handle it. The threads are C++ POSIX threads. This is the simplest Linux C++ multi-threaded socket example you can find. Please leave any comments or questions at the end of this tutorial and I will endeavour to answer them. For a forking server look at Linux C++ Forking Server and Client Example.

        Assumptions
        This article assumes that you have a Linux based C++ compiler installed and configured. You can use cygwin if you do not have a Linux environment.

        Versions used in this example
        

        

        


        
Sofware/Component
Image
        

        
Fedora Core 5
N/A
        



        [소스 다운로드] => LinSocket.zip 
        Steps required for a server socket
        

        

          

        1. Initialize the socket using socket(). 

        2. Set any options such as blocking etc using setsockopt(). 

        3. Bind to the local address and port using bind(). For a server use INADDR_ANY as the address. 

        4. listen() for connections. 

        5. Go into a loop and accept connections usin accept(). Spawn threads (pthread_create) to handle these connections, so you can accept more connections. 
          

            Read and write to the socket. within the thread. 

          • close() 

          • When you are done, close the server socket using close() 

          Steps required for a client socket
          

            

          1. Initialize the socket using socket(). 

          2. Set any options such as blocking etc using setsockopt(). 

          3. Connect to the remote host using connet(). Supply address and port here. Read and write to the socket. close() 

          Write and compile the Server
          

            

          1. The server listens on port 1101 for a connection. When it receives a connection it creates a thread via pthread_create to handle it. This thread then reads from the socket, appends " SERVER ECHO" to it and sends it back to the client. As the server doesn't require an IP address, we assign INADDR_ANY to the sockaddr_in struct. Save this code as LinSever.cpp. 
            

            


            

             1. #include <fcntl.h>
 2. #include <string.h>
 3. #include <stdlib.h>
 4. #include <errno.h>
 5. #include <stdio.h>
 6. #include <netinet/in.h>
 7. #include <resolv.h>
 8. #include <sys/socket.h>
 9. #include <arpa/inet.h>
10. #include <unistd.h>
11. #include <pthread.h>
12. 
13. void* SocketHandler(void*);
14. 
15. int main(int argv, char** argc){
16. 
17.     int host_port= 1101;
18. 
19.     struct sockaddr_in my_addr;
20. 
21.     int hsock;
22.     int * p_int ;
23.     int err;
24. 
25.     socklen_t addr_size = 0;
26.     int* csock;
27.     sockaddr_in sadr;
28.     pthread_t thread_id=0;
29. 
30. 
31.     hsock = socket(AF_INET, SOCK_STREAM, 0);
32.     if(hsock == -1){
33.         printf("Error initializing socket %d\n", errno);
34.         goto FINISH;
35.     }
36.     
37.     p_int = (int*)malloc(sizeof(int));
38.     *p_int = 1;
39.         
40.     if( (setsockopt(hsock, SOL_SOCKET, SO_REUSEADDR, (char*)p_int, sizeof(int)) == -1 )||
41.         (setsockopt(hsock, SOL_SOCKET, SO_KEEPALIVE, (char*)p_int, sizeof(int)) == -1 ) ){
42.         printf("Error setting options %d\n", errno);
43.         free(p_int);
44.         goto FINISH;
45.     }
46.     free(p_int);
47. 
48.     my_addr.sin_family = AF_INET ;
49.     my_addr.sin_port = htons(host_port);
50.     
51.     memset(&(my_addr.sin_zero), 0, 8);
52.     my_addr.sin_addr.s_addr = INADDR_ANY ;
53.     
54.     if( bind( hsock, (sockaddr*)&my_addr, sizeof(my_addr)) == -1 ){
55.         fprintf(stderr,"Error binding to socket, make sure nothing else is listening on this port %d\n",errno);
56.         goto FINISH;
57.     }
58.     if(listen( hsock, 10) == -1 ){
59.         fprintf(stderr, "Error listening %d\n",errno);
60.         goto FINISH;
61.     }
62. 
63.     //Now lets do the server stuff
64. 
65.     addr_size = sizeof(sockaddr_in);
66.     
67.     while(true){
68.         printf("waiting for a connection\n");
69.         csock = (int*)malloc(sizeof(int));
70.         if((*csock = accept( hsock, (sockaddr*)&sadr, &addr_size))!= -1){
71.             printf("---------------------\nReceived connection from %s\n",inet_ntoa(sadr.sin_addr));
72.             pthread_create(&thread_id,0,&SocketHandler, (void*)csock );
73.             pthread_detach(thread_id);
74.         }
75.         else{
76.             fprintf(stderr, "Error accepting %d\n", errno);
77.         }
78.     }
79.     
80. FINISH:
81. ;
82. }
83. 
84. void* SocketHandler(void* lp){
85.     int *csock = (int*)lp;
86. 
87.     char buffer[1024];
88.     int buffer_len = 1024;
89.     int bytecount;
90. 
91.     memset(buffer, 0, buffer_len);
92.     if((bytecount = recv(*csock, buffer, buffer_len, 0))== -1){
93.         fprintf(stderr, "Error receiving data %d\n", errno);
94.         goto FINISH;
95.     }
96.     printf("Received bytes %d\nReceived string \"%s\"\n", bytecount, buffer);
97.     strcat(buffer, " SERVER ECHO");
98. 
99.     if((bytecount = send(*csock, buffer, strlen(buffer), 0))== -1){
100.         fprintf(stderr, "Error sending data %d\n", errno);
101.         goto FINISH;
102.     }
103.     
104.     printf("Sent bytes %d\n", bytecount);
105. 
106. 
107. FINISH:
108.     free(csock);
109.     return 0;
110. }
            Hide line numbers 

            

          2. Open a prompt to the working directory and compile the code using your C++ compiler 

            


            

            ..workspace\SocketExample>g++ -o server LinServer.cpp -lpthread 

          Write and compile the Client
          

            

          1. The client reads a line from the console and sends this to the server. It then reads from the server and displays it on the console. Save this code as LinClient.cpp. 
            

            


            

             1. #include <fcntl.h>
 2. #include <string.h>
 3. #include <stdlib.h>
 4. #include <errno.h>
 5. #include <stdio.h>
 6. #include <netinet/in.h>
 7. #include <resolv.h>
 8. #include <sys/socket.h>
 9. #include <arpa/inet.h>
10. #include <unistd.h>
11. 
12. int main(int argv, char** argc){
13. 
14.     int host_port= 1101;
15.     char* host_name="127.0.0.1";
16. 
17.     struct sockaddr_in my_addr;
18. 
19.     char buffer[1024];
20.     int bytecount;
21.     int buffer_len=0;
22. 
23.     int hsock;
24.     int * p_int;
25.     int err;
26. 
27.     hsock = socket(AF_INET, SOCK_STREAM, 0);
28.     if(hsock == -1){
29.         printf("Error initializing socket %d\n",errno);
30.         goto FINISH;
31.     }
32.     
33.     p_int = (int*)malloc(sizeof(int));
34.     *p_int = 1;
35.         
36.     if( (setsockopt(hsock, SOL_SOCKET, SO_REUSEADDR, (char*)p_int, sizeof(int)) == -1 )||
37.         (setsockopt(hsock, SOL_SOCKET, SO_KEEPALIVE, (char*)p_int, sizeof(int)) == -1 ) ){
38.         printf("Error setting options %d\n",errno);
39.         free(p_int);
40.         goto FINISH;
41.     }
42.     free(p_int);
43. 
44.     my_addr.sin_family = AF_INET ;
45.     my_addr.sin_port = htons(host_port);
46.     
47.     memset(&(my_addr.sin_zero), 0, 8);
48.     my_addr.sin_addr.s_addr = inet_addr(host_name);
49. 
50.     if( connect( hsock, (struct sockaddr*)&my_addr, sizeof(my_addr)) == -1 ){
51.         if((err = errno) != EINPROGRESS){
52.             fprintf(stderr, "Error connecting socket %d\n", errno);
53.             goto FINISH;
54.         }
55.     }
56. 
57.     //Now lets do the client related stuff
58. 
59.     buffer_len = 1024;
60. 
61.     memset(buffer, '\0', buffer_len);
62. 
63.     printf("Enter some text to send to the server (press enter)\n");
64.     fgets(buffer, 1024, stdin);
65.     buffer[strlen(buffer)-1]='\0';
66.     
67.     if( (bytecount=send(hsock, buffer, strlen(buffer),0))== -1){
68.         fprintf(stderr, "Error sending data %d\n", errno);
69.         goto FINISH;
70.     }
71.     printf("Sent bytes %d\n", bytecount);
72. 
73.     if((bytecount = recv(hsock, buffer, buffer_len, 0))== -1){
74.         fprintf(stderr, "Error receiving data %d\n", errno);
75.         goto FINISH;
76.     }
77.     printf("Recieved bytes %d\nReceived string \"%s\"\n", bytecount, buffer);
78. 
79.     close(hsock);
80.     
81. FINISH:
82. ;
83. }
            Hide line numbers 

            

          2. Open a prompt to the working directory and compile the code using your C++ compiler 

            


            

            ..workspace\SocketExample>g++ -o client LinClient.cpp 


          Run the example
          

            

          1. Open a prompt to the working directory and run the server. 
            

            


            

            ..workspace\SocketExample>server 

            

          2. Open another prompt to the working directory and run the Client. 
            

            


            

            ..workspace\SocketExample>client 

            

          3. Now type something into the client prompt and press ENTER. 

          4. You will see the exchange between client and server. You can open many client prompts at the same time and test. 
          

           
          


           
          


           
          ';
66.     
67.     if( (bytecount=send(hsock, buffer, strlen(buffer),0))== -1){
68.         fprintf(stderr, "Error sending data %d\n", errno);
69.         goto FINISH;
70.     }
71.     printf("Sent bytes %d\n", bytecount);
72. 
73.     if((bytecount = recv(hsock, buffer, buffer_len, 0))== -1){
74.         fprintf(stderr, "Error receiving data %d\n", errno);
75.         goto FINISH;
76.     }
77.     printf("Recieved bytes %d\nReceived string \"%s\"\n", bytecount, buffer);
78. 
79.     close(hsock);
80.     
81. FINISH:
82. ;
83. }
          Hide line numbers

        6. Open a prompt to the working directory and compile the code using your C++ compiler

          ..workspace\SocketExample>g++ -o client LinClient.cpp


        Run the example
        1. Open a prompt to the working directory and run the server.

          ..workspace\SocketExample>server

        2. Open another prompt to the working directory and run the Client.

          ..workspace\SocketExample>client

        3. Now type something into the client prompt and press ENTER.
        4. You will see the exchange between client and server. You can open many client prompts at the same time and test.

         

         

         

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