more advanced c++ echo server (single client)

main.cpp

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

#include <iostream> //std::cout


#define PORT 8888
#define INPUT_BUFFER_SIZE 1024

char inputBuffer[INPUT_BUFFER_SIZE];
int listen_fd, comm_fd;

struct sockaddr_in servaddr;

int main() {

    std::cout << "starting...\n";
    
    listen_fd = socket(AF_INET, SOCK_STREAM, 0);

    bzero(&servaddr, sizeof (servaddr));

    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = htons(INADDR_ANY);
    servaddr.sin_port = htons(PORT);


    int opt = 1;
    if (setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, (char *) &opt,
            sizeof (opt)) < 0) {
        perror("setsockopt failed");
        exit(EXIT_FAILURE);
    }

    std::cout << "SOCKET FD:" << listen_fd << "\n";

    std::cout << "BIND ret " << bind(listen_fd, (struct sockaddr *) &servaddr, sizeof (servaddr)) << "\n";

    std::cout << "LISTEN ret " << listen(listen_fd, 10) << "\n";

    comm_fd = accept(listen_fd, (struct sockaddr*) NULL, NULL);

    while (1) {

        bzero(inputBuffer, INPUT_BUFFER_SIZE);

        int succ = read(comm_fd, inputBuffer, INPUT_BUFFER_SIZE);
        std::cout << "read completed\n";

        printf("read %d bytes\n", succ);
        if (0 == succ) {
            std::cout << "read exactly 0 bytes, client disconnected?\n";

        }

        printf("Echoing back: '%s'\n", inputBuffer);
        std::cout << "print complete\n";

        write(comm_fd, inputBuffer, strlen(inputBuffer) + 1);
        std::cout << "write complete\n";
    }
}