socket之multi_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 void *connection_handler(void *); int main(int argc , char *argv[]){    int socket_desc , new_socket , c , *new_sock;    struct sockaddr_in server , client;    char *message;         //Create socket    socket_desc = socket(AF_INET , SOCK_STREAM , 0);    if (socket_desc == -1)    {        printf("Could not create socket");    }         //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)    {        puts("bind failed");        return 1;    }    puts("bind done");         //Listen    listen(socket_desc , 3);         //Accept and incoming connection    puts("Waiting for incoming connections...");    c = sizeof(struct sockaddr_in);    while( (new_socket = accept(socket_desc, (struct sockaddr *)&client, (socklen_t*)&c)) )    {        puts("Connection accepted");                 //Reply to the client        message = "Hello Client , I have received your connection. And now I will assign a handler for you\n";        write(new_socket , message , strlen(message));                 pthread_t sniffer_thread;        new_sock = malloc(1);        *new_sock = new_socket;                 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 (new_socket<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;}