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authorKiyoshi Aman <kiyoshi.aman+adelie@gmail.com>2019-02-01 22:55:37 +0000
committerKiyoshi Aman <kiyoshi.aman+adelie@gmail.com>2019-02-03 18:22:05 -0600
commit5b57d28ffb6e1ef86b50f7d05d977826eae89bfe (patch)
tree154a22fe556b49e6927197336f8bf91b12eacd5e /bin/sleep/sleep.c
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diff --git a/bin/sleep/sleep.c b/bin/sleep/sleep.c
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+/* $NetBSD: sleep.c,v 1.29 2019/01/27 02:00:45 christos Exp $ */
+
+/*
+ * 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.
+ * 3. 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.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+__COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\
+ The Regents of the University of California. All rights reserved.");
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)sleep.c 8.3 (Berkeley) 4/2/94";
+#else
+__RCSID("$NetBSD: sleep.c,v 1.29 2019/01/27 02:00:45 christos Exp $");
+#endif
+#endif /* not lint */
+
+#include <ctype.h>
+#include <err.h>
+#include <locale.h>
+#include <math.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+
+__dead static void alarmhandle(int);
+__dead static void usage(void);
+
+static void report(const time_t, const time_t, const char *const);
+
+static volatile sig_atomic_t report_requested;
+static void
+report_request(int signo __unused)
+{
+
+ report_requested = 1;
+}
+
+int
+main(int argc, char *argv[])
+{
+ char *arg, *temp;
+ const char *msg;
+ double fval, ival, val;
+ struct timespec ntime;
+ time_t original;
+ int ch, fracflag;
+ unsigned delay;
+
+ setprogname(argv[0]);
+ (void)setlocale(LC_ALL, "");
+
+ (void)signal(SIGALRM, alarmhandle);
+
+ while ((ch = getopt(argc, argv, "")) != -1)
+ switch(ch) {
+ default:
+ usage();
+ }
+ argc -= optind;
+ argv += optind;
+
+ if (argc != 1)
+ usage();
+
+ /*
+ * Okay, why not just use atof for everything? Why bother
+ * checking if there is a fraction in use? Because the old
+ * sleep handled the full range of integers, that's why, and a
+ * double can't handle a large long. This is fairly useless
+ * given how large a number a double can hold on most
+ * machines, but now we won't ever have trouble. If you want
+ * 1000000000.9 seconds of sleep, well, that's your
+ * problem. Why use an isdigit() check instead of checking for
+ * a period? Because doing it this way means locales will be
+ * handled transparently by the atof code.
+ *
+ * Since fracflag is set for any non-digit, we also fall
+ * into the floating point conversion path if the input
+ * is hex (the 'x' in 0xA is not a digit). Then if
+ * strtod() handles hex (on NetBSD it does) so will we.
+ * That path is also taken for scientific notation (1.2e+3)
+ * and when the input is simply nonsense.
+ */
+ fracflag = 0;
+ arg = *argv;
+ for (temp = arg; *temp != '\0'; temp++)
+ if (!isdigit((unsigned char)*temp)) {
+ ch = *temp;
+ fracflag++;
+ }
+
+ if (fracflag) {
+ /*
+ * If we cannot convert the value using the user's locale
+ * then try again using the C locale, so strtod() can always
+ * parse values like 2.5, even if the user's locale uses
+ * a different decimal radix character (like ',')
+ *
+ * (but only if that is the potential problem)
+ */
+ val = strtod(arg, &temp);
+ if (*temp != '\0')
+ val = strtod_l(arg, &temp, LC_C_LOCALE);
+ if (val < 0 || temp == arg || *temp != '\0')
+ usage();
+
+ ival = floor(val);
+ fval = (1000000000 * (val-ival));
+ ntime.tv_sec = ival;
+ if ((double)ntime.tv_sec != ival)
+ errx(1, "requested delay (%s) out of range", arg);
+ ntime.tv_nsec = fval;
+
+ if (ntime.tv_sec == 0 && ntime.tv_nsec == 0)
+ return EXIT_SUCCESS; /* was 0.0 or underflowed */
+ } else {
+ ntime.tv_sec = strtol(arg, &temp, 10);
+ if (ntime.tv_sec < 0 || temp == arg || *temp != '\0')
+ usage();
+
+ if (ntime.tv_sec == 0)
+ return EXIT_SUCCESS;
+ ntime.tv_nsec = 0;
+ }
+
+ original = ntime.tv_sec;
+ if (ntime.tv_nsec != 0)
+ msg = " and a bit";
+ else
+ msg = "";
+
+ signal(SIGINFO, report_request);
+
+ if (ntime.tv_sec <= 10000) { /* arbitrary */
+ while (nanosleep(&ntime, &ntime) != 0) {
+ if (report_requested) {
+ report(ntime.tv_sec, original, msg);
+ report_requested = 0;
+ } else
+ err(EXIT_FAILURE, "nanosleep failed");
+ }
+ } else while (ntime.tv_sec > 0) {
+ delay = (unsigned int)ntime.tv_sec;
+
+ if ((time_t)delay != ntime.tv_sec || delay > 30 * 86400)
+ delay = 30 * 86400;
+
+ ntime.tv_sec -= delay;
+ delay = sleep(delay);
+ ntime.tv_sec += delay;
+
+ if (delay != 0 && report_requested) {
+ report(ntime.tv_sec, original, "");
+ report_requested = 0;
+ } else
+ break;
+ }
+
+ return EXIT_SUCCESS;
+ /* NOTREACHED */
+}
+
+ /* Reporting does not bother with nanoseconds. */
+static void
+report(const time_t remain, const time_t original, const char * const msg)
+{
+ if (remain == 0)
+ warnx("In the final moments of the original"
+ " %jd%s second%s", (intmax_t)original, msg,
+ original == 1 && *msg == '\0' ? "" : "s");
+ else if (remain < 2000)
+ warnx("Between %jd and %jd seconds left"
+ " out of the original %g%s",
+ (intmax_t)remain, (intmax_t)remain + 1, (double)original,
+ msg);
+ else if ((original - remain) < 100000 && (original-remain) < original/8)
+ warnx("Have waited only %jd seconds of the original %g",
+ (intmax_t)(original - remain), (double)original);
+ else
+ warnx("Approximately %g seconds left out of the original %g",
+ (double)remain, (double)original);
+}
+
+static void
+usage(void)
+{
+ (void)fprintf(stderr, "usage: %s seconds\n", getprogname());
+ exit(EXIT_FAILURE);
+ /* NOTREACHED */
+}
+
+/* ARGSUSED */
+static void
+alarmhandle(int i)
+{
+ _exit(EXIT_SUCCESS);
+ /* NOTREACHED */
+}