Client.c

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <pthread.h>

#define MAXLINE 100

void *threadsend(void *vargp);
void *threadrecv(void *vargp);

void *threadsend(void *vargp)
{

    int connfd = *((int *)vargp);

    int idata;

    char temp[100];

    while(1){

        fgets(temp, 100, stdin);

        send(connfd, temp, 100, 0);

        printf("<<   Client Send OK   >>\n");
    }

    printf("client has sended");

    return NULL;

}

void *threadrecv(void *vargp)
{

    char temp[100];

    int connfd = *((int *)vargp);

    while(1){

        int idata = 0;

        idata = recv(connfd, temp, 100, 0);

        if(idata > 0){

            printf("<Server>:\n%s\n", temp);
        }
    }

    return NULL;

}

int main()
{

    int *clientfdp;

    clientfdp = (int *)malloc(sizeof(int));

    *clientfdp = socket(AF_INET, SOCK_STREAM, 0);

    struct sockaddr_in serveraddr;

    struct hostent *hp;

    bzero((char *)&serveraddr, sizeof(serveraddr));

    serveraddr.sin_family = AF_INET;

    serveraddr.sin_port = htons(15636);

    serveraddr.sin_addr.s_addr = inet_addr("127.0.0.1");

    if(connect(*clientfdp, (struct sockaddr *)&serveraddr, sizeof(serveraddr)) < 0){

        printf("connect error\n");

        exit(1);

    }

    pthread_t tid1, tid2;

    printf("connected\n");

    while(1){

        pthread_create(&tid1, NULL, threadsend, clientfdp);

        pthread_create(&tid2, NULL, threadrecv, clientfdp);

    }

    return EXIT_SUCCESS;

}