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42 lines
972 B
C
42 lines
972 B
C
/* CERN 2013 (author A. Rubini), part of the ppsi project, GPL v2 or later */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/time.h>
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#include "convert.h"
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/*
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* This is a simple tools to slightly change the system time, in order
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* to check when (and how) PTP resynchronizes it
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*/
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int main(int argc, char **argv)
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{
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struct timeval tv, otv;
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if (argc != 2) {
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fprintf(stderr, "%s: use \"%s <delta>\"\n"
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" <delta> is a floating-point number of seconds\n",
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argv[0], argv[0]);
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exit(1);
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}
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if (str_to_tv(argv[1], &tv) < 0) {
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fprintf(stderr, "%s: not a time (float) number \"%s\"\n",
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argv[0], argv[1]);
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exit(1);
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}
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fprintf(stderr, "Requesting adjustment: %s seconds\n", tv_to_str(&tv));
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if (adjtime(&tv, &otv) < 0) {
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fprintf(stderr, "%s: adjtime(): %s\n", argv[0],
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strerror(errno));
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exit(1);
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}
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fprintf(stderr, "Previous adjustment: %s seconds\n", tv_to_str(&otv));
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exit(0);
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}
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