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/* ntpmon.c -- monitor the inner end of an ntpshm connection
*
* This file is Copyright (c) 2010 by the GPSD project
* BSD terms apply: see the file COPYING in the distribution root for details.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#ifndef S_SPLINT_S
#include <unistd.h>
#endif /* S_SPLINT_S */
#include "ntpshm.h"
#define NTPSEGMENTS 256 /* NTPx for x any byte */
static struct shmTime *segments[NTPSEGMENTS + 1];
static int shm_startup(int count)
/* open a specified number of segments */
{
int i;
for (i = 0; i < count; i++) {
segments[i] = shm_get(i, true);
if (segments[i] == NULL)
return i;
}
return count;
}
static void shm_shutdown(void)
/* shut down all active segments */
{
struct shmTime **pp;
for (pp = segments; *pp; pp++)
(void)shmdt((void *)(*pp));
}
int main(int argc, char **argv)
{
int units = 0;
int opened = 0;
int option;
#define USAGE "usage: ntpmon [-n units] [-s]\n"
while ((option = getopt(argc, argv, "hn:s")) != -1) {
switch (option) {
case 'n':
units = atoi(optarg);
opened = shm_startup(units);
if (opened < units){
fprintf(stderr, "ntpmon: open of unit %d failed.\n", opened);
exit(EXIT_FAILURE);
}
break;
case 's':
if (units > 0)
shm_shutdown();
else {
fprintf(stderr, "ntpmon: zero units declared.\n");
exit(EXIT_FAILURE);
}
break;
case 'h':
default:
fprintf(stderr, USAGE);
break;
}
}
(void)printf("ntpmon version 1\n");
for (;;) {
struct shm_stat_t shm_stat;
int i;
printf("%%\n");
for (i = 0; i < units; i++) {
enum segstat_t status = shm_query(segments[i], &shm_stat);
switch(status)
{
case OK:
printf("%s %ld %ld %ld %ld %d\n",
shm_name(i),
shm_stat.tvr.tv_sec, shm_stat.tvr.tv_nsec,
shm_stat.tvt.tv_sec, shm_stat.tvt.tv_nsec,
shm_stat.leap);
break;
default:
fprintf(stderr, "ntpmon: unknown status %d on segment %s\n",
status, shm_name(i));
break;
}
}
sleep(1);
}
exit(0);
}
/* end */
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