#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <netdb.h>

#include <stdio.h>

#include <string.h>

#include <unistd.h>

#include <stdlib.h>

#define SERVER_PORT 5000

#define BUFLEN 300

int main(int argc, char *argv[]){

int sock, clientsock;

struct sockaddr_in cliAddr,srvAddr;

/*create socket*/

sock = socket(AF_INET, SOCK_STREAM, 0);

if (sock < 0) {

perror("fail to create a socket");

exit(EXIT_FAILURE);

}

srvAddr.sin_family = AF_INET;

srvAddr.sin_addr.s_addr = htonl(INADDR_ANY);

srvAddr.sin_port = htons(SERVER_PORT);

//bind server address

if(bind(sock, (struct sockaddr *)&srvAddr, sizeof(srvAddr)) < 0 ) {

perror("fail to address");

exit(EXIT_FAILURE);

}

listen(sock, 50);

//start to read data from clients

while(1) {

printf("%s: start to wait connetions from client on TCP port %u\n", argv[0] , SERVER_PORT);

int clilen;

clilen = sizeof(cliAddr);

clientsock = accept( sock, (struct sockaddr *)&cliAddr, &clilen);

if(clientsock < 0) {

perror("fail to address");

exit(EXIT_FAILURE);

}

//read data

int n;

char buf[BUFLEN];

while( (n = recv(clientsock, buf, BUFLEN, 0)) > 0 ) {

write(STDOUT_FILENO, buf, n);

}

if(n < 0) perror("recv error\n");

}

close(sock);

}