39 lines
813 B
C
39 lines
813 B
C
#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;
|
|
}
|