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#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int main(int argc, char **argv)
{
struct sockaddr_in addr = { 0 };
int port, num, s;
if (argc != 3) {
fprintf(stderr, "usage: udp_send port num_packets\n");
exit(EXIT_FAILURE);
}
port = atoi(argv[1]);
num = atoi(argv[2]);
if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
fprintf(stderr, "failed to create socket\n");
exit(EXIT_FAILURE);
}
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
inet_aton("127.0.0.1", &addr.sin_addr);
while(num--) {
char *message = "if not now, when?";
int ret;
ret = sendto(s, message, strlen(message), 0,
(struct sockaddr *) &addr, sizeof(addr));
if (ret < 0) {
fprintf(stderr, "failed to send message\n");
exit(EXIT_FAILURE);
}
}
return 0;
}
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