/* * Copyright (c) 1988, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California. All rights reserved. * @(#)sleep.c 8.3 (Berkeley) 4/2/94 * $FreeBSD: src/bin/sleep/sleep.c,v 1.9.2.1 2001/08/01 05:23:25 obrien Exp $ * $DragonFly: src/bin/sleep/sleep.c,v 1.7 2005/02/27 15:57:15 liamfoy Exp $ */ #include #include #include #include #include #include #include static void usage(void); int main(int argc, char **argv) { struct timespec time_to_sleep; long l; int ch, neg; char *p; setlocale(LC_ALL, ""); while ((ch = getopt(argc, argv, "")) != -1) switch(ch) { default: usage(); /* NOTREACHED */ } argc -= optind; argv += optind; if (argc != 1) { usage(); /* NOTREACHED */ } p = argv[0]; /* Skip over leading whitespaces. */ while (isspace(*p)) ++p; /* Check for optional `+' or `-' sign. */ neg = 0; if (*p == '-') { neg = 1; ++p; } else if (*p == '+') ++p; /* Calculate seconds. */ if (isdigit(*p)) { l = strtol(p, &p, 10); if (l > INT_MAX) { /* * Avoid overflow when `seconds' is huge. This assumes * that the maximum value for a time_t is <= INT_MAX. */ l = INT_MAX; } } else l = 0; time_to_sleep.tv_sec = (time_t)l; /* Calculate nanoseconds. */ time_to_sleep.tv_nsec = 0; if (*p == '.') { /* Decimal point. */ l = 100000000L; do { if (isdigit(*++p)) time_to_sleep.tv_nsec += (*p - '0') * l; else break; } while (l /= 10); } if (!neg && (time_to_sleep.tv_sec > 0 || time_to_sleep.tv_nsec > 0)) nanosleep(&time_to_sleep, (struct timespec *)NULL); exit(0); } static void usage(void) { fprintf(stderr, "usage: sleep seconds\n"); exit(1); }