so2 socket client example

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

#define BUFF_SIZE (1 << 10)

static int sockfd;

void *thRoutineRead(void *arg) {
    char buffer[BUFF_SIZE + 1];
    while (fgets(buffer, BUFF_SIZE, stdin))
    {
        write(sockfd, buffer, strlen(buffer));
    }
    close(sockfd); // se inchide socket-ul
    return NULL;
}

void *thRoutineDisplay(void *arg) {
    char buffer[BUFF_SIZE + 1];
    int r;
    while ((r = read(sockfd, buffer, BUFF_SIZE)) > 0)
    {
        buffer[r] = 0;
        printf("Received: %s", buffer);
    }

    return NULL;
}

int main(void) {

    struct sockaddr_in server;  // structura sockaddr pentru stocarea adresei si portului destinatie la care se va realiza conexiunea
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)  // crearea socket-ului TCP
    {
        perror("socket");
        exit(1);
    }
    memset(&server, 0, sizeof(server)); // initializarea cu 0 a structurii sockaddr
    server.sin_family = AF_INET;        // setarea modului AF_INET obligatoriu pentru aceasta structura
    server.sin_addr.s_addr = inet_addr("127.0.0.1");    // setarea adresei ip la care sa se realizeze conexiunea (in acest caz 127.0.01 - localhost)
    server.sin_port = htons(4556); // setarea portului
    if ((connect(sockfd, (struct sockaddr *)&server, sizeof(server))) < 0) // realizarea conexiunii cu serverul
    {
        perror("connect");
        exit(1);
    }
    printf("Connected\n");


    pthread_t thRead;
    if (pthread_create(&thRead, NULL, thRoutineRead, NULL) != 0) {
        exit(EXIT_FAILURE);
    }

    pthread_t thWrite;
    if (pthread_create(&thWrite, NULL, thRoutineDisplay, NULL) != 0) {
        exit(EXIT_FAILURE);
    }


    pthread_join(thRead, NULL);
    pthread_join(thWrite, NULL);

    return 0;
}