diff options
Diffstat (limited to 'lib/libkvm/kvm_getloadavg.c')
| -rw-r--r-- | lib/libkvm/kvm_getloadavg.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/lib/libkvm/kvm_getloadavg.c b/lib/libkvm/kvm_getloadavg.c new file mode 100644 index 0000000..e4777e7 --- /dev/null +++ b/lib/libkvm/kvm_getloadavg.c @@ -0,0 +1,102 @@ +/*- + * Copyright (c) 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#if defined(LIBC_SCCS) && !defined(lint) +#if 0 +static char sccsid[] = "@(#)kvm_getloadavg.c 8.1 (Berkeley) 6/4/93"; +#endif +#endif /* LIBC_SCCS and not lint */ + +#include <sys/param.h> +#include <sys/time.h> +#include <sys/resource.h> + +#include <stdlib.h> +#include <limits.h> +#include <nlist.h> +#include <kvm.h> + +#include "kvm_private.h" + +static struct nlist nl[] = { + { "_averunnable" }, +#define X_AVERUNNABLE 0 + { "_fscale" }, +#define X_FSCALE 1 + { "" }, +}; + +/* + * kvm_getloadavg() -- Get system load averages, from live or dead kernels. + * + * Put `nelem' samples into `loadavg' array. + * Return number of samples retrieved, or -1 on error. + */ +int +kvm_getloadavg(kd, loadavg, nelem) + kvm_t *kd; + double loadavg[]; + int nelem; +{ + struct loadavg loadinfo; + struct nlist *p; + int fscale, i; + + if (ISALIVE(kd)) + return (getloadavg(loadavg, nelem)); + + if (kvm_nlist(kd, nl) != 0) { + for (p = nl; p->n_type != 0; ++p); + _kvm_err(kd, kd->program, + "%s: no such symbol", p->n_name); + return (-1); + } + +#define KREAD(kd, addr, obj) \ + (kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj)) + if (KREAD(kd, nl[X_AVERUNNABLE].n_value, &loadinfo)) { + _kvm_err(kd, kd->program, "can't read averunnable"); + return (-1); + } + + /* + * Old kernels have fscale separately; if not found assume + * running new format. + */ + if (!KREAD(kd, nl[X_FSCALE].n_value, &fscale)) + loadinfo.fscale = fscale; + + nelem = MIN(nelem, sizeof(loadinfo.ldavg) / sizeof(fixpt_t)); + for (i = 0; i < nelem; i++) + loadavg[i] = (double) loadinfo.ldavg[i] / loadinfo.fscale; + return (nelem); +} |
