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
  10 /* BB_AUDIT SUSv3 compliant */
  11 /* BB_AUDIT GNU issues -- fancy version matches except args must be ints. */
  12 /* http://www.opengroup.org/onlinepubs/007904975/utilities/sleep.html */
  13
  14 /* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
  15  *
  16  * Rewritten to do proper arg and error checking.
  17  * Also, added a 'fancy' configuration to accept multiple args with
  18  * time suffixes for seconds, minutes, hours, and days.
  19  */
  20
  21 //usage:#define sleep_trivial_usage
  22 //usage:        IF_FEATURE_FANCY_SLEEP("[") "N" IF_FEATURE_FANCY_SLEEP("]...")
  23 //usage:#define sleep_full_usage "\n\n"
  24 //usage:        IF_NOT_FEATURE_FANCY_SLEEP("Pause for N seconds")
  25 //usage:        IF_FEATURE_FANCY_SLEEP(
  26 //usage:       "Pause for a time equal to the total of the args given, where each arg can\n"
  27 //usage:       "have an optional suffix of (s)econds, (m)inutes, (h)ours, or (d)ays")
  28 //usage:
  29 //usage:#define sleep_example_usage
  30 //usage:       "$ sleep 2\n"
  31 //usage:       "[2 second delay results]\n"
  32 //usage:        IF_FEATURE_FANCY_SLEEP(
  33 //usage:       "$ sleep 1d 3h 22m 8s\n"
  34 //usage:       "[98528 second delay results]\n")
  35
  36 #include "libbb.h"
  37
  38 /* Do not make this applet NOFORK. It breaks ^C-ing of pauses in shells */
  39
  40
  41 #if ENABLE_FEATURE_FANCY_SLEEP || ENABLE_FEATURE_FLOAT_SLEEP
  42 static const struct suffix_mult sfx[] = {
  43         { "s", 1 },
  44         { "m", 60 },
  45         { "h", 60*60 },
  46         { "d", 24*60*60 },
  47         { "", 0 }
  48 };
  49 #endif
  50
  51 int sleep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  52 int sleep_main(int argc UNUSED_PARAM, char **argv)
  53 {
  54 #if ENABLE_FEATURE_FLOAT_SLEEP
  55         double duration;
  56         struct timespec ts;
  57 #else
  58         unsigned duration;
  59 #endif
  60
  61         ++argv;
  62         if (!*argv)
  63                 bb_show_usage();
  64
  65 #if ENABLE_FEATURE_FLOAT_SLEEP
  66
  67 # if ENABLE_LOCALE_SUPPORT
  68         /* undo busybox.c setlocale */
  69         setlocale(LC_NUMERIC, "C");
  70 # endif
  71         duration = 0;
  72         do {
  73                 char *arg = *argv;
  74                 if (strchr(arg, '.')) {
  75                         double d;
  76                         char *pp;
  77                         int len = strspn(arg, "0123456789.");
  78                         char sv = arg[len];
  79                         arg[len] = '\0';
  80                         errno = 0;
  81                         d = strtod(arg, &pp);
  82                         if (errno || *pp)
  83                                 bb_show_usage();
  84                         arg += len;
  85                         *arg-- = sv;
  86                         sv = *arg;
  87                         *arg = '1';
  88                         duration += d * xatoul_sfx(arg, sfx);
  89                         *arg = sv;
  90                 } else {
  91                         duration += xatoul_sfx(arg, sfx);
  92                 }
  93         } while (*++argv);
  94
  95         ts.tv_sec = MAXINT(typeof(ts.tv_sec));
  96         ts.tv_nsec = 0;
  97         if (duration >= 0 && duration < ts.tv_sec) {
  98                 ts.tv_sec = duration;
  99                 ts.tv_nsec = (duration - ts.tv_sec) * 1000000000;
 100         }
 101         do {
 102                 errno = 0;
 103                 nanosleep(&ts, &ts);
 104         } while (errno == EINTR);
 105
 106 #elif ENABLE_FEATURE_FANCY_SLEEP
 107
 108         duration = 0;
 109         do {
 110                 duration += xatou_range_sfx(*argv, 0, UINT_MAX - duration, sfx);
 111         } while (*++argv);
 112         sleep(duration);
 113
 114 #else /* simple */
 115
 116         duration = xatou(*argv);
 117         sleep(duration);
 118         // Off. If it's really needed, provide example why
 119         //if (sleep(duration)) {
 120         //      bb_perror_nomsg_and_die();
 121         //}
 122
 123 #endif
 124
 125         return EXIT_SUCCESS;
 126 }