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 tarball for details.
   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/* This is a NOFORK applet. Be very careful! */
  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        { }
  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        duration = 0;
  53        do {
  54                char *arg = *argv;
  55                if (strchr(arg, '.')) {
  56                        double d;
  57                        int len = strspn(arg, "0123456789.");
  58                        char sv = arg[len];
  59                        arg[len] = '\0';
  60                        d = bb_strtod(arg, NULL);
  61                        if (errno)
  62                                bb_show_usage();
  63                        arg[len] = sv;
  64                        len--;
  65                        sv = arg[len];
  66                        arg[len] = '1';
  67                        duration += d * xatoul_sfx(&arg[len], sfx);
  68                        arg[len] = sv;
  69                } else
  70                        duration += xatoul_sfx(arg, sfx);
  71        } while (*++argv);
  72
  73        ts.tv_sec = MAXINT(typeof(ts.tv_sec));
  74        ts.tv_nsec = 0;
  75        if (duration >= 0 && duration < ts.tv_sec) {
  76                ts.tv_sec = duration;
  77                ts.tv_nsec = (duration - ts.tv_sec) * 1000000000;
  78        }
  79        do {
  80                errno = 0;
  81                nanosleep(&ts, &ts);
  82        } while (errno == EINTR);
  83
  84#elif ENABLE_FEATURE_FANCY_SLEEP
  85
  86        duration = 0;
  87        do {
  88                duration += xatou_range_sfx(*argv, 0, UINT_MAX - duration, sfx);
  89        } while (*++argv);
  90        sleep(duration);
  91
  92#else /* simple */
  93
  94        duration = xatou(*argv);
  95        sleep(duration);
  96        // Off. If it's really needed, provide example why
  97        //if (sleep(duration)) {
  98        //      bb_perror_nomsg_and_die();
  99        //}
 100
 101#endif
 102
 103        return EXIT_SUCCESS;
 104}
 105