83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/* Test of getting load average.
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Copyright (C) 2011-2025 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <stdlib.h>
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#include "signature.h"
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SIGNATURE_CHECK (getloadavg, int, (double [], int));
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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static void
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check_avg (int minutes, double avg, int printit)
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{
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if (printit)
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printf ("%d-minute: %f ", minutes, avg);
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else
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{
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/* Plausibility checks. */
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if (avg < 0.01)
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printf ("suspiciously low %d-minute average: %f\n", minutes, avg);
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if (avg > 1000000)
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printf ("suspiciously high %d-minute average: %f\n", minutes, avg);
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}
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if (avg < 0 || avg != avg)
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exit (minutes);
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}
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/* This program can also be used as a manual test, by invoking it with
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an argument; it then prints the load average. If the argument is
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nonzero, the manual test repeats forever, sleeping for the stated
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interval between each iteration. */
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int
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main (int argc, char **argv)
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{
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int naptime = 0;
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if (argc > 1)
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naptime = atoi (argv[1]);
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while (1)
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{
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double avg[3];
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int loads = getloadavg (avg, 3);
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if (loads == -1)
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{
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if (! (errno == ENOSYS || errno == ENOTSUP || errno == ENOENT))
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return 1;
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perror ("Skipping test; load average not supported");
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return 77;
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}
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if (loads > 0)
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check_avg (1, avg[0], argc > 1);
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if (loads > 1)
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check_avg (5, avg[1], argc > 1);
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if (loads > 2)
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check_avg (15, avg[2], argc > 1);
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if (loads > 0 && argc > 1)
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putchar ('\n');
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if (naptime == 0)
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break;
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sleep (naptime);
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}
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return 0;
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}
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