SocketsClient.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdlib.h>
#define NUM 100

int sockfd, portno, n;
struct sockaddr_in serv_addr;
struct hostent *server;
char buffer[256];


void error(char *msg)
{
    perror(msg);
    exit(0);
}

int *show_time()
{
    n = read(sockfd, buffer, 255);
    if (n < 0)
        error("ERROR reading from socket");
    printf("%s\n", buffer);

    return 0;
}

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

    if (argc < 3) {
        fprintf(stderr,"usage %s hostname port\n", argv[0]);
        exit(0);
    }
    portno = atoi(argv[2]);
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0)
        error("ERROR opening socket");
    server = gethostbyname(argv[1]);
    if (server == NULL) {
        fprintf(stderr,"ERROR, no such host\n");
        exit(0);
    }
    bzero((char *) &serv_addr, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    bcopy((char *)server->h_addr,
          (char *)&serv_addr.sin_addr.s_addr,
          server->h_length);
    serv_addr.sin_port = htons(portno);
    if (connect(sockfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr)) < 0)
        error("ERROR connecting");
    ///////////////threading
    pthread_t th[NUM];
    int er;
    for(int i=0;i<NUM;i++) {

        er = pthread_create(&th[i],NULL,&show_time,NULL);

        sleep(1);

        system("clear");

        //   clrscr();
        if(er)

        {
//            std::cout << "err" << std::endl;
            exit(-1);
        }


    }
    //show_time();
    pthread_exit(NULL);
   ///////////////threading
    //printf("Please enter the message: ");
    //bzero(buffer,256);
    //fgets(buffer,255,stdin);
    //n = write(sockfd,buffer,strlen(buffer));
    //if (n < 0)
    //    error("ERROR writing to socket");
    bzero(buffer,256);

    return 0;
}