text: /*-
   * Copyright (c) 1988, 1993, 1994
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #if 0
  #ifndef lint
  static char const copyright[] =
  "@(#) Copyright (c) 1988, 1993, 1994\n\
  	The Regents of the University of California.  All rights reserved.\n";
  #endif /* not lint */
  
  #ifndef lint
  static char sccsid[] = "@(#)sleep.c	8.3 (Berkeley) 4/2/94";
  #endif /* not lint */
  #endif
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD: releng/11.0/bin/sleep/sleep.c 251433 2013-06-05 20:15:18Z jilles $");
  
  #include <ctype.h>
  #include <err.h>
  #include <errno.h>
  #include <limits.h>
  #include <signal.h>
  #include <stdint.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <time.h>
  
  static void usage(void);
  
  static volatile sig_atomic_t report_requested;
  static void
  report_request(int signo __unused)
  {
  
  	report_requested = 1;
  }
  
  int
  main(int argc, char *argv[])
  {
  	struct timespec time_to_sleep;
  	double d;
  	time_t original;
  	char buf[2];
  
  	if (argc != 2)
  		usage();
  
  	if (sscanf(argv[1], "%lf%1s", &d, buf) != 1)
  		usage();
  	if (d > INT_MAX)
  		usage();
  	if (d <= 0)
  		return (0);
  	original = time_to_sleep.tv_sec = (time_t)d;
  	time_to_sleep.tv_nsec = 1e9 * (d - time_to_sleep.tv_sec);
  
  	signal(SIGINFO, report_request);
  
  	/*
  	 * Note: [EINTR] is supposed to happen only when a signal was handled
  	 * but the kernel also returns it when a ptrace-based debugger
  	 * attaches. This is a bug but it is hard to fix.
  	 */
  	while (nanosleep(&time_to_sleep, &time_to_sleep) != 0) {
  		if (report_requested) {
  			/* Reporting does not bother with nanoseconds. */
  			warnx("about %d second(s) left out of the original %d",
  			    (int)time_to_sleep.tv_sec, (int)original);
  			report_requested = 0;
  		} else if (errno != EINTR)
  			err(1, "nanosleep");
  	}
  	return (0);
  }
  
  static void
  usage(void)
  {
  
  	fprintf(stderr, "usage: sleep seconds\n");
  	exit(1);
  }
  