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
50
51
52
53
|
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
static inline void die(const char *msg) {
perror(msg);
exit(-1);
}
int main() {
struct sockaddr_in srv_addr, cli_addr;
int sockopt = 1;
socklen_t sad_sz = sizeof(struct sockaddr_in);
int sfd, cfd;
ssize_t bytes;
char buf[256];
srv_addr.sin_family = AF_INET;
srv_addr.sin_port = htons(8000);
srv_addr.sin_addr.s_addr = INADDR_ANY;
if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
die("Couldn't open the socket");
setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, (char *) &sockopt, sizeof(sockopt));
if (bind(sfd, (struct sockaddr *) &srv_addr, sad_sz) < 0)
die("Couldn't bind socket");
if (listen(sfd, 1) < 0)
die("Couldn't listen to the socket");
cfd = accept(sfd, (struct sockaddr *) &cli_addr, &sad_sz);
if (cfd < 0)
die("Couldn't accept incoming connection");
while ((bytes = read(cfd, buf, sizeof(buf))) != 0) {
if (bytes < 0)
die("Couldn't receive message");
if (write(cfd, buf, bytes) < 0)
die("Couldn't send message");
}
close(cfd);
close(sfd);
return 0;
}
|
