1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <string.h>
#include <arpa/inet.h>
int main(int argc, char *argv[]) {
int sockfd, connfd;
struct sockaddr_in servaddr, cli;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
int port = atoi(argv[1]);
servaddr.sin_port = htons(port);
bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
listen(sockfd, 128);
printf("Server started at %s...\n", inet_ntoa(servaddr.sin_addr));
fflush(stdout);
while(1) {
socklen_t len = sizeof(cli);
connfd = accept(sockfd, (struct sockaddr *)&cli, &len);
int i = getpeername(connfd, (struct sockaddr*)&cli, &len);
printf("Client connected at port %d\n", htons(cli.sin_port));
int n;
char buf[100];
int pid;
if((pid=fork())==0){
close(sockfd);
while((n = recv(connfd, buf, 100, 0)) > 0) {
printf("Client message: %s\n", buf);
fflush(stdout);
send(connfd, buf, n, 0);
};
exit(0);
}
close(connfd);
}
return 0;
}
|
