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 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