Added socket thread

Author: sunnet-si

Diff for: net/socket_thread.c

@@ -0,0 +1,120 @@
+/*
+    C socket server example, handles multiple clients using threads
+*/
+ 
+#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( 8888 );
+     
+    //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);
+    while( (client_sock = accept(socket_desc, (struct sockaddr *)&client, (socklen_t*)&c)) )
+    {
+        puts("Connection accepted");
+         
+        pthread_t sniffer_thread;
+        new_sock = malloc(1);
+        *new_sock = client_sock;
+         
+        if( pthread_create( &sniffer_thread , NULL ,  connection_handler , (void*) new_sock) < 0)
+        {
+            perror("could not create thread");
+            return 1;
+        }
+         
+        //Now join the thread , so that we dont terminate before the thread
+        //pthread_join( sniffer_thread , 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 )
+    {
+        //Send the message back to client
+        write(sock , client_message , strlen(client_message));
+    }
+     
+    if(read_size == 0)
+    {
+        puts("Client disconnected");
+        fflush(stdout);
+    }
+    else if(read_size == -1)
+    {
+        perror("recv failed");
+    }
+         
+    //Free the socket pointer
+    free(socket_desc);
+     
+    return 0;
+}