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YidaChen/tcp_server.c

Created August 1, 2016 07:42
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Revisions

  1. @silv3rm00n silv3rm00n revised this gist Jun 20, 2013. 1 changed file with 2 additions and 2 deletions.
    4 changes: 2 additions & 2 deletions tcp_server.c
    View file
    Original file line number Diff line number Diff line change
    @@ -17,7 +17,7 @@ void *connection_handler(void *);

    int main(int argc , char *argv[])
    {
    int socket_desc , client_sock , c , *new_sock;
    int socket_desc , client_sock , c;
    struct sockaddr_in server , client;

    //Create socket
    @@ -31,7 +31,7 @@ int main(int argc , char *argv[])
    //Prepare the sockaddr_in structure
    server.sin_family = AF_INET;
    server.sin_addr.s_addr = INADDR_ANY;
    server.sin_port = htons( 6666 );
    server.sin_port = htons( 8888 );

    //Bind
    if( bind(socket_desc,(struct sockaddr *)&server , sizeof(server)) < 0)
  2. @silv3rm00n silv3rm00n created this gist Jun 20, 2013.
    123 changes: 123 additions & 0 deletions tcp_server.c
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,123 @@
    /*
    C socket server example, handles multiple clients using threads
    Compile
    gcc server.c -lpthread -o server
    */

    #include<stdio.h>
    #include<string.h> //strlen
    #include<stdlib.h> //strlen
    #include<sys/socket.h>
    #include<arpa/inet.h> //inet_addr
    #include<unistd.h> //write
    #include<pthread.h> //for threading , link with lpthread

    //the thread function
    void *connection_handler(void *);

    int main(int argc , char *argv[])
    {
    int socket_desc , client_sock , c , *new_sock;
    struct sockaddr_in server , client;

    //Create socket
    socket_desc = socket(AF_INET , SOCK_STREAM , 0);
    if (socket_desc == -1)
    {
    printf("Could not create socket");
    }
    puts("Socket created");

    //Prepare the sockaddr_in structure
    server.sin_family = AF_INET;
    server.sin_addr.s_addr = INADDR_ANY;
    server.sin_port = htons( 6666 );

    //Bind
    if( bind(socket_desc,(struct sockaddr *)&server , sizeof(server)) < 0)
    {
    //print the error message
    perror("bind failed. Error");
    return 1;
    }
    puts("bind done");

    //Listen
    listen(socket_desc , 3);

    //Accept and incoming connection
    puts("Waiting for incoming connections...");
    c = sizeof(struct sockaddr_in);


    //Accept and incoming connection
    puts("Waiting for incoming connections...");
    c = sizeof(struct sockaddr_in);
    pthread_t thread_id;

    while( (client_sock = accept(socket_desc, (struct sockaddr *)&client, (socklen_t*)&c)) )
    {
    puts("Connection accepted");

    if( pthread_create( &thread_id , NULL , connection_handler , (void*) &client_sock) < 0)
    {
    perror("could not create thread");
    return 1;
    }

    //Now join the thread , so that we dont terminate before the thread
    //pthread_join( thread_id , NULL);
    puts("Handler assigned");
    }

    if (client_sock < 0)
    {
    perror("accept failed");
    return 1;
    }

    return 0;
    }

    /*
    * This will handle connection for each client
    * */
    void *connection_handler(void *socket_desc)
    {
    //Get the socket descriptor
    int sock = *(int*)socket_desc;
    int read_size;
    char *message , client_message[2000];

    //Send some messages to the client
    message = "Greetings! I am your connection handler\n";
    write(sock , message , strlen(message));

    message = "Now type something and i shall repeat what you type \n";
    write(sock , message , strlen(message));

    //Receive a message from client
    while( (read_size = recv(sock , client_message , 2000 , 0)) > 0 )
    {
    //end of string marker
    client_message[read_size] = '\0';

    //Send the message back to client
    write(sock , client_message , strlen(client_message));

    //clear the message buffer
    memset(client_message, 0, 2000);
    }

    if(read_size == 0)
    {
    puts("Client disconnected");
    fflush(stdout);
    }
    else if(read_size == -1)
    {
    perror("recv failed");
    }

    return 0;
    }