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/*
* util.h -- General utility functions
*
* Copyright (C) 2004 Henrique de Moraes Holschuh <hmh@debian.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define _GNU_SOURCE
#ifndef HAVE_CONFIG_H
#error Invalid or missing autoconf build environment
#endif
#include "rng-tools-config.h"
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <time.h>
#include <sys/time.h>
#include <sys/utsname.h>
#include "util.h"
#include <assert.h>
/* Computes elapsed time in microseconds */
uint64_t elapsed_time(struct timeval *start,
struct timeval *stop)
{
int64_t diff;
assert(start != NULL && stop != NULL);
diff = (stop->tv_sec - start->tv_sec) * 1000000ULL
+ stop->tv_usec - start->tv_usec;
return llabs(diff);
}
/* Returns kernel support level */
/* FIXME: track down safe 2.5 version */
kernel_mode_t kernel_mode( void ) {
struct utsname buf;
long i;
char *p, *q;
if (uname(&buf))
return KERNEL_UNSUPPORTED;
if (!strncmp(buf.sysname, "Linux", 6)) {
i = strtol(buf.release, &p, 10); /* Major version */
if ((i < 2) || *p != '.')
return KERNEL_UNSUPPORTED;
if (i > 2)
return KERNEL_LINUX_26;
p++;
q = p;
i = strtol(p, &q, 10); /* Minor version */
if (p == q || *q != '.' || i < 4)
return KERNEL_UNSUPPORTED;
if (i < 6)
return KERNEL_LINUX_24;
return KERNEL_LINUX_26;
}
return KERNEL_UNSUPPORTED;
}
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