source: MondoRescue/branches/3.2/mindi-busybox/coreutils/sleep.c@ 3828

/* vi: set sw=4 ts=4: */
/*
 * sleep implementation for busybox
 *
 * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

/* BB_AUDIT SUSv3 compliant */
/* BB_AUDIT GNU issues -- fancy version matches except args must be ints. */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/sleep.html */

/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
 *
 * Rewritten to do proper arg and error checking.
 * Also, added a 'fancy' configuration to accept multiple args with
 * time suffixes for seconds, minutes, hours, and days.
 */

//usage:#define sleep_trivial_usage
//usage:    IF_FEATURE_FANCY_SLEEP("[") "N" IF_FEATURE_FANCY_SLEEP("]...")
//usage:#define sleep_full_usage "\n\n"
//usage:    IF_NOT_FEATURE_FANCY_SLEEP("Pause for N seconds")
//usage:    IF_FEATURE_FANCY_SLEEP(
//usage:       "Pause for a time equal to the total of the args given, where each arg can\n"
//usage:       "have an optional suffix of (s)econds, (m)inutes, (h)ours, or (d)ays")
//usage:
//usage:#define sleep_example_usage
//usage:       "$ sleep 2\n"
//usage:       "[2 second delay results]\n"
//usage:    IF_FEATURE_FANCY_SLEEP(
//usage:       "$ sleep 1d 3h 22m 8s\n"
//usage:       "[98528 second delay results]\n")

#include "libbb.h"

/* Do not make this applet NOFORK. It breaks ^C-ing of pauses in shells */


#if ENABLE_FEATURE_FANCY_SLEEP || ENABLE_FEATURE_FLOAT_SLEEP
static const struct suffix_mult sfx[] = {
    { "s", 1 },
    { "m", 60 },
    { "h", 60*60 },
    { "d", 24*60*60 },
    { "", 0 }
};
#endif

int sleep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int sleep_main(int argc UNUSED_PARAM, char **argv)
{
#if ENABLE_FEATURE_FLOAT_SLEEP
    double duration;
    struct timespec ts;
#else
    unsigned duration;
#endif

    ++argv;
    if (!*argv)
        bb_show_usage();

#if ENABLE_FEATURE_FLOAT_SLEEP

# if ENABLE_LOCALE_SUPPORT
    /* undo busybox.c setlocale */
    setlocale(LC_NUMERIC, "C");
# endif
    duration = 0;
    do {
        char *arg = *argv;
        if (strchr(arg, '.')) {
            double d;
            char *pp;
            int len = strspn(arg, "0123456789.");
            char sv = arg[len];
            arg[len] = '\0';
            errno = 0;
            d = strtod(arg, &pp);
            if (errno || *pp)
                bb_show_usage();
            arg += len;
            *arg-- = sv;
            sv = *arg;
            *arg = '1';
            duration += d * xatoul_sfx(arg, sfx);
            *arg = sv;
        } else {
            duration += xatoul_sfx(arg, sfx);
        }
    } while (*++argv);

    ts.tv_sec = MAXINT(typeof(ts.tv_sec));
    ts.tv_nsec = 0;
    if (duration >= 0 && duration < ts.tv_sec) {
        ts.tv_sec = duration;
        ts.tv_nsec = (duration - ts.tv_sec) * 1000000000;
    }
    do {
        errno = 0;
        nanosleep(&ts, &ts);
    } while (errno == EINTR);

#elif ENABLE_FEATURE_FANCY_SLEEP

    duration = 0;
    do {
        duration += xatou_range_sfx(*argv, 0, UINT_MAX - duration, sfx);
    } while (*++argv);
    sleep(duration);

#else /* simple */

    duration = xatou(*argv);
    sleep(duration);
    // Off. If it's really needed, provide example why
    //if (sleep(duration)) {
    //  bb_perror_nomsg_and_die();
    //}

#endif

    return EXIT_SUCCESS;
}