#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#define PORT 8080
#define BUF_SIZE 100
#define BACKLOG 4
char buf[BUF_SIZE];
int numRead;
void echo(int cfd) {
while ((numRead = read(cfd, buf, BUF_SIZE)) > 0) {
printf("%s","Message received from a client:");
puts(buf);
if (write(cfd, buf, numRead) != numRead)
return;
int main() {
    int sfd;
    int cfd;
int b;
struct sockaddr_in sa;
FILE *client;
fd_set readfds, masterfds;
int nready;
int i;
int maxfd;
if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("socket");
return 1;
bzero(&sa, sizeof sa);
if (listen(sfd, BACKLOG) == -1)
sa.sin_family = AF_INET;
sa.sin_port   = htons(PORT);
if (INADDR_ANY)
sa.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(sfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
perror("bind");
return 2;
for (;;) {
cfd = accept(sfd, NULL, NULL);
if (cfd == -1)
}
return 1;
if (fork() == 0) {
close(sfd);
echo(cfd);
close(cfd);
exit(0);
close(cfd);
} }
}
}
return 1;
} }