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
  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#include "libbb.h"
  22
  23/* Do not make this applet NOFORK. It breaks ^C-ing of pauses in shells */
  24
  25
  26#if ENABLE_FEATURE_FANCY_SLEEP || ENABLE_FEATURE_FLOAT_SLEEP
  27static const struct suffix_mult sfx[] = {
  28        { "s", 1 },
  29        { "m", 60 },
  30        { "h", 60*60 },
  31        { "d", 24*60*60 },
  32        { "", 0 }
  33};
  34#endif
  35
  36int sleep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  37int sleep_main(int argc UNUSED_PARAM, char **argv)
  38{
  39#if ENABLE_FEATURE_FLOAT_SLEEP
  40        double duration;
  41        struct timespec ts;
  42#else
  43        unsigned duration;
  44#endif
  45
  46        ++argv;
  47        if (!*argv)
  48                bb_show_usage();
  49
  50#if ENABLE_FEATURE_FLOAT_SLEEP
  51
  52# if ENABLE_LOCALE_SUPPORT
  53        /* undo busybox.c setlocale */
  54        setlocale(LC_NUMERIC, "C");
  55# endif
  56        duration = 0;
  57        do {
  58                char *arg = *argv;
  59                if (strchr(arg, '.')) {
  60                        double d;
  61                        char *pp;
  62                        int len = strspn(arg, "0123456789.");
  63                        char sv = arg[len];
  64                        arg[len] = '\0';
  65                        errno = 0;
  66                        d = strtod(arg, &pp);
  67                        if (errno || *pp)
  68                                bb_show_usage();
  69                        arg += len;
  70                        *arg-- = sv;
  71                        sv = *arg;
  72                        *arg = '1';
  73                        duration += d * xatoul_sfx(arg, sfx);
  74                        *arg = sv;
  75                } else {
  76                        duration += xatoul_sfx(arg, sfx);
  77                }
  78        } while (*++argv);
  79
  80        ts.tv_sec = MAXINT(typeof(ts.tv_sec));
  81        ts.tv_nsec = 0;
  82        if (duration >= 0 && duration < ts.tv_sec) {
  83                ts.tv_sec = duration;
  84                ts.tv_nsec = (duration - ts.tv_sec) * 1000000000;
  85        }
  86        do {
  87                errno = 0;
  88                nanosleep(&ts, &ts);
  89        } while (errno == EINTR);
  90
  91#elif ENABLE_FEATURE_FANCY_SLEEP
  92
  93        duration = 0;
  94        do {
  95                duration += xatou_range_sfx(*argv, 0, UINT_MAX - duration, sfx);
  96        } while (*++argv);
  97        sleep(duration);
  98
  99#else /* simple */
 100
 101        duration = xatou(*argv);
 102        sleep(duration);
 103        // Off. If it's really needed, provide example why
 104        //if (sleep(duration)) {
 105        //      bb_perror_nomsg_and_die();
 106        //}
 107
 108#endif
 109
 110        return EXIT_SUCCESS;
 111}
 112