LXR busybox/coreutils/sleep.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * sleep implementation for busybox
   4 *
   5 * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
   6 *
   7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8 */
   9/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
  10 *
  11 * Rewritten to do proper arg and error checking.
  12 * Also, added a 'fancy' configuration to accept multiple args with
  13 * time suffixes for seconds, minutes, hours, and days.
  14 */
  15//config:config SLEEP
  16//config:       bool "sleep (2 kb)"
  17//config:       default y
  18//config:       help
  19//config:       sleep is used to pause for a specified number of seconds.
  20//config:       It comes in 3 versions:
  21//config:       - small: takes one integer parameter
  22//config:       - fancy: takes multiple integer arguments with suffixes:
  23//config:               sleep 1d 2h 3m 15s
  24//config:       - fancy with fractional numbers:
  25//config:               sleep 2.3s 4.5h sleeps for 16202.3 seconds
  26//config:       Last one is "the most compatible" with coreutils sleep,
  27//config:       but it adds around 1k of code.
  28//config:
  29//config:config FEATURE_FANCY_SLEEP
  30//config:       bool "Enable multiple arguments and s/m/h/d suffixes"
  31//config:       default y
  32//config:       depends on SLEEP
  33//config:       help
  34//config:       Allow sleep to pause for specified minutes, hours, and days.
  35
  36/* Do not make this applet NOFORK. It breaks ^C-ing of pauses in shells */
  37//applet:IF_SLEEP(APPLET(sleep, BB_DIR_BIN, BB_SUID_DROP))
  38
  39//kbuild:lib-$(CONFIG_SLEEP) += sleep.o
  40
  41/* BB_AUDIT SUSv3 compliant */
  42/* BB_AUDIT GNU issues -- fancy version matches except args must be ints. */
  43/* http://www.opengroup.org/onlinepubs/007904975/utilities/sleep.html */
  44
  45//usage:#define sleep_trivial_usage
  46//usage:        IF_FEATURE_FANCY_SLEEP("[") "N" IF_FEATURE_FANCY_SLEEP("]...")
  47//usage:#define sleep_full_usage "\n\n"
  48//usage:        IF_NOT_FEATURE_FANCY_SLEEP("Pause for N seconds")
  49//usage:        IF_FEATURE_FANCY_SLEEP(
  50//usage:       "Pause for a time equal to the total of the args given, where each arg can\n"
  51//usage:       "have an optional suffix of (s)econds, (m)inutes, (h)ours, or (d)ays")
  52//usage:
  53//usage:#define sleep_example_usage
  54//usage:       "$ sleep 2\n"
  55//usage:       "[2 second delay results]\n"
  56//usage:        IF_FEATURE_FANCY_SLEEP(
  57//usage:       "$ sleep 1d 3h 22m 8s\n"
  58//usage:       "[98528 second delay results]\n")
  59
  60#include "libbb.h"
  61
  62int sleep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  63int sleep_main(int argc UNUSED_PARAM, char **argv)
  64{
  65        duration_t duration;
  66
  67        ++argv;
  68        if (!*argv)
  69                bb_show_usage();
  70
  71        /* GNU sleep accepts "inf", "INF", "infinity" and "INFINITY" */
  72        if (strncasecmp(argv[0], "inf", 3) == 0)
  73                for (;;)
  74                        sleep(INT_MAX);
  75
  76#if ENABLE_FEATURE_FANCY_SLEEP
  77        duration = 0;
  78        do {
  79                duration += parse_duration_str(*argv);
  80        } while (*++argv);
  81        sleep_for_duration(duration);
  82#else /* simple */
  83        duration = xatou(*argv);
  84        sleep(duration);
  85#endif
  86        return EXIT_SUCCESS;
  87}
  88