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// udp client driver program
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include "common.h"
static const unsigned char payload_request[] = { PAYLOAD_REQUEST, 0xFF};
struct {
unsigned long long int send_start;
unsigned long long int received_end;
} timings[MAX_UDP_PACKETS];
static int set_ts(unsigned long long int * const out) {
struct timeval tv = {};
if (gettimeofday(&tv, NULL) != 0)
return 1;
*out = (tv.tv_sec * 1000 * 1000) + tv.tv_usec;
return 0;
}
int main() {
char buffer[BUFSIZ];
int sockfd;
struct sockaddr_in servaddr = {};
servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");
servaddr.sin_port = htons(UDP_PORT);
servaddr.sin_family = AF_INET;
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0) {
perror("udp socket");
return 1;
}
if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) {
perror("udp connect");
return 1;
}
size_t i;
ssize_t n;
for (i = 0; i < MAX_UDP_PACKETS; ++i) {
if (set_ts(&timings[i].send_start) != 0) {
n = -1;
break;
}
n = sendto(sockfd, payload_request, sizeof(payload_request), 0, NULL, 0);
if (n < 0) {
perror("udp sendto");
break;
}
n = recvfrom(sockfd, buffer, sizeof(buffer), 0, (struct sockaddr *)NULL,
NULL);
if (n < 0) {
perror("udp recvfrom");
break;
}
if (set_ts(&timings[i].received_end) != 0) {
n = -1;
break;
}
}
close(sockfd);
printf("# packet_number rtt\n");
for (size_t i = 0; i < MAX_UDP_PACKETS; ++i) {
printf("%zu %lld\n", i, timings[i].received_end - timings[i].send_start);
}
return !(i == MAX_UDP_PACKETS);
}
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