1/*	$NetBSD: current_time.c,v 1.2 2020/04/04 23:22:12 kamil Exp $  */
2
3/*-
4 * Copyright (c) 2020 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: current_time.c,v 1.2 2020/04/04 23:22:12 kamil Exp $");
31
32#include <sys/param.h>
33#include <sys/module.h>
34#include <dev/clock_subr.h>
35
36/*
37 * Function print_time() fetches the epoch seconds/unix time from the
38 * getmicrotime() function and sends its to clock_secs_to_ymdhms(..) in
39 * dev/clock_subr to parse it into readable date and time format and print it.
40 *
41 * Please note that the current time is printed in GMT/UTC because the kernel
42 * doesn't have the notion of local timezones.
43 */
44
45static void
46print_current_time(void)
47{
48	struct timeval tv;
49	struct clock_ymdhms dt;
50	const char *w_day[] = {
51		"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday",
52		"Friday", "Saturday"
53	};
54
55	getmicrotime(&tv);
56	clock_secs_to_ymdhms(tv.tv_sec, &dt);
57
58	printf("Current Time: %s, %04" PRIu64 "/%02" PRIu8 "/%02" PRIu8
59	    " %02" PRIu8 ":%02" PRIu8 ":%02" PRIu8 " UTC\n",
60	    w_day[dt.dt_wday], dt.dt_year, dt.dt_mon, dt.dt_day, dt.dt_hour,
61	    dt.dt_min, dt.dt_sec);
62}
63
64MODULE(MODULE_CLASS_MISC, current_time, NULL);
65
66static int
67current_time_modcmd(modcmd_t cmd, void *arg __unused)
68{
69	switch (cmd) {
70	case MODULE_CMD_INIT:
71		printf("current_time example module loaded.\n");
72		print_current_time();
73		break;
74	case MODULE_CMD_FINI:
75		printf("current_time example module unloaded.\n");
76		break;
77	default:
78		return ENOTTY;
79	}
80
81	return 0;
82}
83