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