mirror of
https://github.com/topjohnwu/ndk-busybox.git
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103 lines
3.3 KiB
C
103 lines
3.3 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 (2 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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/* 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-$(CONFIG_SLEEP) += sleep.o
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//kbuild:lib-$(CONFIG_ASH_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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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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duration_t duration;
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/* Note: sleep_main may be directly called from ash as a builtin.
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* This brings some complications:
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* + we can't use xfunc here
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* + we can't use bb_show_usage
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* + applet_name can be the name of the shell
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*/
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++argv;
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if (!*argv) {
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/* Without this, bare "sleep" in ash shows _ash_ --help */
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/* (ash can be the "sh" applet as well, so check 2nd char) */
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if (ENABLE_ASH_SLEEP && applet_name[1] != 'l') {
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bb_simple_error_msg("sleep: missing operand");
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return EXIT_FAILURE;
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}
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bb_show_usage();
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}
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/* GNU sleep accepts "inf", "INF", "infinity" and "INFINITY" */
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if (strncasecmp(argv[0], "inf", 3) == 0)
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for (;;)
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sleep(INT_MAX);
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//FIXME: in ash, "sleep 123qwerty" as a builtin aborts the shell
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#if ENABLE_FEATURE_FANCY_SLEEP
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duration = 0;
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do {
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duration += parse_duration_str(*argv);
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} while (*++argv);
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sleep_for_duration(duration);
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#else /* simple */
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duration = xatou(*argv);
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sleep(duration);
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#endif
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return EXIT_SUCCESS;
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}
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