155 lines
4.1 KiB
C
155 lines
4.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* sleep implementation for busybox
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*
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* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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*
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* Rewritten to do proper arg and error checking.
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* Also, added a 'fancy' configuration to accept multiple args with
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* time suffixes for seconds, minutes, hours, and days.
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*/
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//config:config SLEEP
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//config: bool "sleep (1.7 kb)"
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//config: default y
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//config: help
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//config: sleep is used to pause for a specified number of seconds.
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//config: It comes in 3 versions:
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//config: - small: takes one integer parameter
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//config: - fancy: takes multiple integer arguments with suffixes:
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//config: sleep 1d 2h 3m 15s
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//config: - fancy with fractional numbers:
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//config: sleep 2.3s 4.5h sleeps for 16202.3 seconds
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//config: Last one is "the most compatible" with coreutils sleep,
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//config: but it adds around 1k of code.
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//config:
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//config:config FEATURE_FANCY_SLEEP
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//config: bool "Enable multiple arguments and s/m/h/d suffixes"
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//config: default y
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//config: depends on SLEEP
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//config: help
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//config: Allow sleep to pause for specified minutes, hours, and days.
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//config:
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//config:config FEATURE_FLOAT_SLEEP
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//config: bool "Enable fractional arguments"
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//config: default y
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//config: depends on FEATURE_FANCY_SLEEP
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//config: help
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//config: Allow for fractional numeric parameters.
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/* Do not make this applet NOFORK. It breaks ^C-ing of pauses in shells */
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//applet:IF_SLEEP(APPLET(sleep, BB_DIR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_SLEEP) += sleep.o
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/* BB_AUDIT SUSv3 compliant */
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/* BB_AUDIT GNU issues -- fancy version matches except args must be ints. */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/sleep.html */
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//usage:#define sleep_trivial_usage
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//usage: IF_FEATURE_FANCY_SLEEP("[") "N" IF_FEATURE_FANCY_SLEEP("]...")
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//usage:#define sleep_full_usage "\n\n"
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//usage: IF_NOT_FEATURE_FANCY_SLEEP("Pause for N seconds")
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//usage: IF_FEATURE_FANCY_SLEEP(
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//usage: "Pause for a time equal to the total of the args given, where each arg can\n"
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//usage: "have an optional suffix of (s)econds, (m)inutes, (h)ours, or (d)ays")
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//usage:
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//usage:#define sleep_example_usage
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//usage: "$ sleep 2\n"
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//usage: "[2 second delay results]\n"
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//usage: IF_FEATURE_FANCY_SLEEP(
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//usage: "$ sleep 1d 3h 22m 8s\n"
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//usage: "[98528 second delay results]\n")
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#include "libbb.h"
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#if ENABLE_FEATURE_FANCY_SLEEP || ENABLE_FEATURE_FLOAT_SLEEP
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static const struct suffix_mult sfx[] = {
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{ "s", 1 },
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{ "m", 60 },
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{ "h", 60*60 },
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{ "d", 24*60*60 },
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{ "", 0 }
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};
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#endif
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int sleep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int sleep_main(int argc UNUSED_PARAM, char **argv)
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{
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#if ENABLE_FEATURE_FLOAT_SLEEP
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double duration;
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struct timespec ts;
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#else
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unsigned duration;
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#endif
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++argv;
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if (!*argv)
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bb_show_usage();
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#if ENABLE_FEATURE_FLOAT_SLEEP
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# if ENABLE_LOCALE_SUPPORT
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/* undo busybox.c setlocale */
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setlocale(LC_NUMERIC, "C");
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# endif
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duration = 0;
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do {
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char *arg = *argv;
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if (strchr(arg, '.')) {
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double d;
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char *pp;
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int len = strspn(arg, "0123456789.");
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char sv = arg[len];
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arg[len] = '\0';
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errno = 0;
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d = strtod(arg, &pp);
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if (errno || *pp)
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bb_show_usage();
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arg += len;
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*arg-- = sv;
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sv = *arg;
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*arg = '1';
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duration += d * xatoul_sfx(arg, sfx);
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*arg = sv;
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} else {
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duration += xatoul_sfx(arg, sfx);
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}
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} while (*++argv);
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ts.tv_sec = MAXINT(typeof(ts.tv_sec));
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ts.tv_nsec = 0;
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if (duration >= 0 && duration < ts.tv_sec) {
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ts.tv_sec = duration;
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ts.tv_nsec = (duration - ts.tv_sec) * 1000000000;
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}
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do {
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errno = 0;
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nanosleep(&ts, &ts);
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} while (errno == EINTR);
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#elif ENABLE_FEATURE_FANCY_SLEEP
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duration = 0;
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do {
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duration += xatou_range_sfx(*argv, 0, UINT_MAX - duration, sfx);
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} while (*++argv);
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sleep(duration);
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#else /* simple */
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duration = xatou(*argv);
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sleep(duration);
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// Off. If it's really needed, provide example why
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//if (sleep(duration)) {
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// bb_perror_nomsg_and_die();
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//}
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#endif
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return EXIT_SUCCESS;
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}
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