mirror of
https://github.com/jart/cosmopolitan.git
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79 lines
3.2 KiB
C
79 lines
3.2 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/sysinfo.h"
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#include "libc/calls/struct/sysinfo.internal.h"
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#include "libc/calls/syscall-nt.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/sysv/errfuns.h"
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#define CTL_VM 2
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#define VM_LOADAVG 2
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struct loadavg {
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uint32_t ldavg[3];
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int64_t fscale;
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};
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/**
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* Returns system load average.
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*
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* @param a should be array of 3 doubles
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* @param n should be 3
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* @return number of items placed in `a` or -1 w/ errno
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* @raise ENOSYS on metal
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*/
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int getloadavg(double *a, int n) {
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// cat /proc/loadavg
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int i, rc;
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if (n > 3)
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n = 3;
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if (!n) {
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rc = 0;
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} else if (n < 0) {
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rc = einval();
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} else if (IsWindows()) {
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return sys_getloadavg_nt(a, n);
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} else if (IsLinux()) {
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struct sysinfo si;
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if ((rc = sys_sysinfo(&si)) != -1) {
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for (i = 0; i < n; i++) {
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a[i] = 1. / 65536 * si.loads[i];
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}
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rc = n;
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}
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} else if (IsFreebsd() || IsNetbsd() || IsOpenbsd() || IsXnu()) {
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size_t size;
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struct loadavg loadinfo;
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int mib[2] = {CTL_VM, VM_LOADAVG};
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size = sizeof(loadinfo);
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if ((rc = sysctl(mib, 2, &loadinfo, &size, 0, 0)) != -1) {
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for (i = 0; i < n; i++) {
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a[i] = (double)loadinfo.ldavg[i] / loadinfo.fscale;
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}
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rc = n;
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}
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} else {
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rc = enosys();
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}
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STRACE("getloadavg(%p, %d) → %d% m", a, n, rc);
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return rc;
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}
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