14b40bdbdSAlan Somers /* 24b40bdbdSAlan Somers * Copyright (c) 2014 Spectra Logic Corporation 34b40bdbdSAlan Somers * All rights reserved. 44b40bdbdSAlan Somers * 54b40bdbdSAlan Somers * Redistribution and use in source and binary forms, with or without 64b40bdbdSAlan Somers * modification, are permitted provided that the following conditions 74b40bdbdSAlan Somers * are met: 84b40bdbdSAlan Somers * 1. Redistributions of source code must retain the above copyright 94b40bdbdSAlan Somers * notice, this list of conditions, and the following disclaimer, 104b40bdbdSAlan Somers * without modification. 114b40bdbdSAlan Somers * 2. Redistributions in binary form must reproduce at minimum a disclaimer 124b40bdbdSAlan Somers * substantially similar to the "NO WARRANTY" disclaimer below 134b40bdbdSAlan Somers * ("Disclaimer") and any redistribution must be conditioned upon 144b40bdbdSAlan Somers * including a substantially similar Disclaimer requirement for further 154b40bdbdSAlan Somers * binary redistribution. 164b40bdbdSAlan Somers * 174b40bdbdSAlan Somers * NO WARRANTY 184b40bdbdSAlan Somers * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 194b40bdbdSAlan Somers * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 204b40bdbdSAlan Somers * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 214b40bdbdSAlan Somers * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 224b40bdbdSAlan Somers * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 234b40bdbdSAlan Somers * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 244b40bdbdSAlan Somers * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 254b40bdbdSAlan Somers * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 264b40bdbdSAlan Somers * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 274b40bdbdSAlan Somers * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 284b40bdbdSAlan Somers * POSSIBILITY OF SUCH DAMAGES. 294b40bdbdSAlan Somers * 304b40bdbdSAlan Somers * Authors: Alan Somers (Spectra Logic Corporation) 314b40bdbdSAlan Somers * 324b40bdbdSAlan Somers * $FreeBSD$ 334b40bdbdSAlan Somers */ 344b40bdbdSAlan Somers 354b40bdbdSAlan Somers #include <errno.h> 364b40bdbdSAlan Somers #include <stdio.h> 374b40bdbdSAlan Somers #include <stdlib.h> 384b40bdbdSAlan Somers #include <unistd.h> 394b40bdbdSAlan Somers 40*c27ac74fSLi-Wen Hsu #define RANDOM_MAX ((1U<<31) - 1) 414b40bdbdSAlan Somers 424b40bdbdSAlan Somers int main(int argc, char** argv){ 434b40bdbdSAlan Somers useconds_t max_usecs, usecs; 444b40bdbdSAlan Somers double frac; 454b40bdbdSAlan Somers 464b40bdbdSAlan Somers if (argc != 2) { 474b40bdbdSAlan Somers printf("Usage: randsleep <max_microseconds>\n"); 484b40bdbdSAlan Somers exit(2); 494b40bdbdSAlan Somers } 504b40bdbdSAlan Somers 514b40bdbdSAlan Somers errno = 0; 524b40bdbdSAlan Somers max_usecs = (useconds_t)strtol(argv[1], NULL, 0); 534b40bdbdSAlan Somers if (errno != 0) { 544b40bdbdSAlan Somers perror("strtol"); 554b40bdbdSAlan Somers exit(1); 564b40bdbdSAlan Somers } 574b40bdbdSAlan Somers srandomdev(); 584b40bdbdSAlan Somers frac = (double)random() / (double)RANDOM_MAX; 594b40bdbdSAlan Somers usecs = (useconds_t)((double)max_usecs * frac); 604b40bdbdSAlan Somers usleep(usecs); 614b40bdbdSAlan Somers 624b40bdbdSAlan Somers return (0); 634b40bdbdSAlan Somers } 64