mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-02 01:40:07 +00:00
47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
/* Get system load averages. Linux version.
|
|
Copyright (C) 1999-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <array_length.h>
|
|
#include <sys/param.h>
|
|
#include <sys/sysinfo.h>
|
|
|
|
/* Put the 1 minute, 5 minute and 15 minute load averages
|
|
into the first NELEM elements of LOADAVG.
|
|
Return the number written (never more than 3, but may be less than NELEM),
|
|
or -1 if an error occurred. */
|
|
|
|
#define CLAMP(v, lo, hi) MIN (MAX (v, lo), hi)
|
|
|
|
#define SYSINFO_LOADS_SCALE (1 << SI_LOAD_SHIFT)
|
|
|
|
int
|
|
getloadavg (double loadavg[], int nelem)
|
|
{
|
|
struct sysinfo info;
|
|
|
|
if (__sysinfo (&info) != 0)
|
|
return -1;
|
|
|
|
nelem = CLAMP (nelem, 0, array_length (info.loads));
|
|
|
|
for (int i = 0; i < nelem; i++)
|
|
loadavg[i] = (double) info.loads[i] / SYSINFO_LOADS_SCALE;
|
|
|
|
return nelem;
|
|
}
|