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/* Test of getting load average.
Copyright (C) 2011-2023 Free Software Foundation, Inc.
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 3 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, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include <stdlib.h>
#include "signature.h"
SIGNATURE_CHECK (getloadavg, int, (double [], int));
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
static void
check_avg (int minutes, double avg, int printit)
{
if (printit)
printf ("%d-minute: %f ", minutes, avg);
else
{
/* Plausibility checks. */
if (avg < 0.01)
printf ("suspiciously low %d-minute average: %f\n", minutes, avg);
if (avg > 1000000)
printf ("suspiciously high %d-minute average: %f\n", minutes, avg);
}
if (avg < 0 || avg != avg)
exit (minutes);
}
/* This program can also be used as a manual test, by invoking it with
an argument; it then prints the load average. If the argument is
nonzero, the manual test repeats forever, sleeping for the stated
interval between each iteration. */
int
main (int argc, char **argv)
{
int naptime = 0;
if (argc > 1)
naptime = atoi (argv[1]);
while (1)
{
double avg[3];
int loads = getloadavg (avg, 3);
if (loads == -1)
{
if (! (errno == ENOSYS || errno == ENOTSUP || errno == ENOENT))
return 1;
perror ("Skipping test; load average not supported");
return 77;
}
if (loads > 0)
check_avg (1, avg[0], argc > 1);
if (loads > 1)
check_avg (5, avg[1], argc > 1);
if (loads > 2)
check_avg (15, avg[2], argc > 1);
if (loads > 0 && argc > 1)
putchar ('\n');
if (naptime == 0)
break;
sleep (naptime);
}
return 0;
}
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