sleep.c 2.8 KB

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  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. /* Do not make this applet NOFORK. It breaks ^C-ing of pauses in shells */
  36. //applet:IF_SLEEP(APPLET(sleep, BB_DIR_BIN, BB_SUID_DROP))
  37. //kbuild:lib-$(CONFIG_SLEEP) += sleep.o
  38. /* BB_AUDIT SUSv3 compliant */
  39. /* BB_AUDIT GNU issues -- fancy version matches except args must be ints. */
  40. /* http://www.opengroup.org/onlinepubs/007904975/utilities/sleep.html */
  41. //usage:#define sleep_trivial_usage
  42. //usage: IF_FEATURE_FANCY_SLEEP("[") "N" IF_FEATURE_FANCY_SLEEP("]...")
  43. //usage:#define sleep_full_usage "\n\n"
  44. //usage: IF_NOT_FEATURE_FANCY_SLEEP("Pause for N seconds")
  45. //usage: IF_FEATURE_FANCY_SLEEP(
  46. //usage: "Pause for a time equal to the total of the args given, where each arg can\n"
  47. //usage: "have an optional suffix of (s)econds, (m)inutes, (h)ours, or (d)ays")
  48. //usage:
  49. //usage:#define sleep_example_usage
  50. //usage: "$ sleep 2\n"
  51. //usage: "[2 second delay results]\n"
  52. //usage: IF_FEATURE_FANCY_SLEEP(
  53. //usage: "$ sleep 1d 3h 22m 8s\n"
  54. //usage: "[98528 second delay results]\n")
  55. #include "libbb.h"
  56. int sleep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  57. int sleep_main(int argc UNUSED_PARAM, char **argv)
  58. {
  59. duration_t duration;
  60. ++argv;
  61. if (!*argv)
  62. bb_show_usage();
  63. /* GNU sleep accepts "inf", "INF", "infinity" and "INFINITY" */
  64. if (strncasecmp(argv[0], "inf", 3) == 0)
  65. for (;;)
  66. sleep(INT_MAX);
  67. #if ENABLE_FEATURE_FANCY_SLEEP
  68. duration = 0;
  69. do {
  70. duration += parse_duration_str(*argv);
  71. } while (*++argv);
  72. sleep_for_duration(duration);
  73. #else /* simple */
  74. duration = xatou(*argv);
  75. sleep(duration);
  76. #endif
  77. return EXIT_SUCCESS;
  78. }