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
| #include <stdio.h>
| #include <stdlib.h>
| #include <unistd.h>
| #include <sys/socket.h>
| #include <netinet/in.h>
|
| int main (int argc, char *argv[])
| {
| int s, len, o, port = 6666;
| char buf[512];
| struct sockaddr_in addr;
| socklen_t addr_len = sizeof addr;
|
| if (argc > 1)
| port = atoi (argv[1]);
|
| s = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
|
| o = 1;
| len = 4;
| setsockopt (3, SOL_SOCKET, SO_REUSEADDR, &o, len);
|
| addr.sin_family = AF_INET;
| addr.sin_port = htons (port);
| addr.sin_addr.s_addr = INADDR_ANY; /* receive broadcasts */
|
| bind (s, (struct sockaddr *) &addr, sizeof addr);
|
| for (;;) {
| len = recvfrom (s, buf, sizeof buf, 0, (struct sockaddr *) &addr, &addr_len);
| if (len < 0)
| break;
| if (write (1, buf, len) != len)
| fprintf(stderr, "WARNING: serial characters dropped\n");
| }
|
| return 0;
| }
|
|
