47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
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/* Get system load averages. Linux version.
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Copyright (C) 1999-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <array_length.h>
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#include <sys/param.h>
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#include <sys/sysinfo.h>
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/* Put the 1 minute, 5 minute and 15 minute load averages
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into the first NELEM elements of LOADAVG.
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Return the number written (never more than 3, but may be less than NELEM),
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or -1 if an error occurred. */
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#define CLAMP(v, lo, hi) MIN (MAX (v, lo), hi)
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#define SYSINFO_LOADS_SCALE (1 << SI_LOAD_SHIFT)
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int
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getloadavg (double loadavg[], int nelem)
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{
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struct sysinfo info;
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if (__sysinfo (&info) != 0)
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return -1;
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nelem = CLAMP (nelem, 0, array_length (info.loads));
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for (int i = 0; i < nelem; i++)
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loadavg[i] = (double) info.loads[i] / SYSINFO_LOADS_SCALE;
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return nelem;
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}
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