94 lines
3.1 KiB
C
94 lines
3.1 KiB
C
/*-
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)getloadavg.c 6.2 (Berkeley) 6/29/90";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/file.h>
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#include <nlist.h>
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static struct nlist nl[] = {
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{ "_averunnable" },
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#define X_AVERUNNABLE 0
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{ "_fscale" },
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#define X_FSCALE 1
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{ "" },
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};
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/*
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* getloadavg() -- Get system load averages.
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*
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* Put `nelem' samples into `loadavg' array.
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* Return number of samples retrieved, or -1 on error.
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*/
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getloadavg(loadavg, nelem)
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double loadavg[];
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int nelem;
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{
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static int need_nlist = 1;
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fixpt_t averunnable[3];
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int fscale, kmemfd, i;
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int alreadyopen;
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if ((alreadyopen = kvm_openfiles(NULL, NULL, NULL)) == -1)
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return (-1);
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/*
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* cache nlist
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*/
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if (need_nlist) {
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if (kvm_nlist(nl) != 0)
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goto bad;
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need_nlist = 0;
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}
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if (kvm_read((off_t)nl[X_AVERUNNABLE].n_value, (char *)averunnable,
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sizeof(averunnable)) != sizeof(averunnable))
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goto bad;
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if (kvm_read( (off_t)nl[X_FSCALE].n_value, (char *)&fscale,
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sizeof(fscale)) != sizeof(fscale))
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goto bad;
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nelem = MIN(nelem, sizeof(averunnable) / sizeof(averunnable[0]));
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for (i = 0; i < nelem; i++)
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loadavg[i] = (double) averunnable[i] / fscale;
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if (!alreadyopen)
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kvm_close();
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return (nelem);
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bad:
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if (!alreadyopen)
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kvm_close();
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return (-1);
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}
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