freebsd-dev/tests/sys/net/randsleep.c
Li-Wen Hsu c27ac74f9c Properly fix GCC build in r357867
Submitted by:	kib
Sponsored by:	The FreeBSD Foundation
2020-02-14 09:25:29 +00:00

64 lines
2.1 KiB
C

/*
* Copyright (c) 2014 Spectra Logic Corporation
* 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,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
*
* Authors: Alan Somers (Spectra Logic Corporation)
*
* $FreeBSD$
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define RANDOM_MAX ((1U<<31) - 1)
int main(int argc, char** argv){
useconds_t max_usecs, usecs;
double frac;
if (argc != 2) {
printf("Usage: randsleep <max_microseconds>\n");
exit(2);
}
errno = 0;
max_usecs = (useconds_t)strtol(argv[1], NULL, 0);
if (errno != 0) {
perror("strtol");
exit(1);
}
srandomdev();
frac = (double)random() / (double)RANDOM_MAX;
usecs = (useconds_t)((double)max_usecs * frac);
usleep(usecs);
return (0);
}