chat-client.c

#include <sys/socket.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <poll.h>
#include <unistd.h>

int main() {
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);

    struct sockaddr_in address = {
        AF_INET, 
        htons(9999),
        0
    };


    connect(sockfd, &address, sizeof(address)); 

    //stdin - 0

    struct pollfd fds[2] = {  
        {
            0, 
            POLLIN, 
            0
        },
        {
            sockfd,
            POLLIN,
            0
        }
    };

    for (;;) {
        char buffer[256] = { 0 };

        poll(fds, 2, 50000);

        // Send to the server.
        if (fds[0].revents & POLLIN) {
            read(0, buffer, 255);
            send(sockfd, buffer, 255, 0);
        }

        // If there is something to be read in from the client. 
        else if (fds[1].revents & POLLIN ) { 
            if (recv(sockfd, buffer, 255, 0) == 0) {
                return 0;
            }
            printf("%s\n", buffer);
        }
            
    }

    return 0;
}