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ping: use gettimeofday instead of relying on clock ticks

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This commit is contained in:
K. Lange 2023-01-05 23:21:17 +09:00
parent a4a73a0835
commit fa3b341744
1 changed files with 9 additions and 3 deletions
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12
apps/ping.c
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@ -16,7 +16,7 @@
#include <unistd.h>
#include <poll.h>
#include <signal.h>
#include <sys/times.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
@ -32,6 +32,12 @@ struct ICMP_Header {
uint8_t payload[];
};
static unsigned long clocktime(void) {
struct timeval tv;
gettimeofday(&tv,NULL);
return tv.tv_sec * 1000000 + tv.tv_usec;
}
static uint16_t icmp_checksum(char * payload, size_t len) {
uint32_t sum = 0;
uint16_t * s = (uint16_t *)payload;
@ -98,7 +104,7 @@ int main(int argc, char * argv[]) {
ping->checksum = htons(icmp_checksum((void*)ping, BYTES_TO_SEND));
/* Send it and wait */
clock_t sent_at = times(NULL);
unsigned long sent_at = clocktime();
if (sendto(sock, (void*)ping, BYTES_TO_SEND, 0, (struct sockaddr*)&dest, sizeof(struct sockaddr_in)) < 0) {
fprintf(stderr, "sendto: %s\n", strerror(errno));
}
@ -115,7 +121,7 @@ int main(int argc, char * argv[]) {
struct sockaddr_in source;
socklen_t source_size = sizeof(struct sockaddr_in);
ssize_t len = recvfrom(sock, data, 4096, 0, (struct sockaddr*)&source, &source_size);
clock_t rcvd_at = times(NULL);
unsigned long rcvd_at = clocktime();
if (len > 0) {
/* Is it actually a PING response ? */