server.c

// Server side C/C++ program to demonstrate Socket programming 
// See: https://www.geeksforgeeks.org/socket-programming-cc/

#include <unistd.h> 
#include <stdio.h> 
#include <sys/socket.h> 
#include <stdlib.h> 
#include <netinet/in.h> 
#include <string.h> 
#include <pthread.h>
#define PORT 8080 

int main(int argc, char const *argv[]) 
{ 
	int server_fd, client_socket, valread; 
	struct sockaddr_in address; 
	int opt = 1; 
	int addrlen = sizeof(address); 
	char buffer[1024] = {0}; 
	char *hello = "Hello from server"; 
	pthread_t thread1, thread2;
	
	// Creating socket file descriptor
	// AF_INET is IPv4, SOCK_STREAM is tcp connection
	if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) 
	{ 
		perror("socket failed"); 
		exit(EXIT_FAILURE); 
	} 
	
	// set socket options including connection to the port 8080 
	if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, 
								 &opt, sizeof(opt))) 
	{ 
		perror("setsockopt"); 
		exit(EXIT_FAILURE); 
	}
	
	address.sin_family = AF_INET; 
	address.sin_addr.s_addr = INADDR_ANY; 
	address.sin_port = htons( PORT ); 
	
	// attach socket to server 
	if (bind(server_fd, (struct sockaddr *)&address, 
								sizeof(address))<0) 
	{ 
		perror("bind failed"); 
		exit(EXIT_FAILURE); 
	} 
	
	if (listen(server_fd, 3) < 0) 
	{ 
		perror("listen"); 
		exit(EXIT_FAILURE); 
	}
	
	if ((client_socket = accept(server_fd, (struct sockaddr *)&address, 
					(socklen_t*)&addrlen))<0) 
	{ 
		perror("accept"); 
		exit(EXIT_FAILURE); 
	} 

while(1){

	valread = read( client_socket , buffer, 1024); 
	printf("%s",buffer ); 

	
	for(size_t i = 0; i < 1024; i++)
	{
		buffer[i]='\0';
	}
	
	fgets(buffer,sizeof(buffer),stdin);
	
	send(client_socket , buffer , strlen(buffer) , 0 ); 


	for(size_t i = 0; i < 1024; i++)
	{
		buffer[i]='\0';
	}
	

}


	
	 
	return 0; 
}