1 /*
2 * Copyright (c) 2023 Darren Tucker <dtucker@openssh.com>
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 /* $OpenBSD: timestamp.c,v 1.1 2023/03/01 09:29:32 dtucker Exp $ */
18
19 /*
20 * Print a microsecond-granularity timestamp to stdout in an ISO8601-ish
21 * format, which we can then use as the first component of the log file
22 * so that they'll sort into chronological order.
23 */
24
25 #include <sys/time.h>
26
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <time.h>
30
31 int
main(void)32 main(void)
33 {
34 struct timeval tv;
35 struct tm *tm;
36 char buf[1024];
37
38 if (gettimeofday(&tv, NULL) != 0)
39 exit(1);
40 if ((tm = localtime(&tv.tv_sec)) == NULL)
41 exit(2);
42 if (strftime(buf, sizeof buf, "%Y%m%dT%H%M%S", tm) <= 0)
43 exit(3);
44 printf("%s.%06d\n", buf, (int)tv.tv_usec);
45 exit(0);
46 }
47