/*	$NetBSD: nlist.c,v 1.19 2003/01/18 10:52:17 thorpej Exp $	*/

/*
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Simon Burge.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

/*
 * Copyright (c) 1990, 1993, 1994
 *	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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 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>
#ifndef lint
#if 0
static char sccsid[] = "@(#)nlist.c	8.4 (Berkeley) 4/2/94";
#else
__RCSID("$NetBSD: nlist.c,v 1.19 2003/01/18 10:52:17 thorpej Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/time.h>
#include <sys/lwp.h>
#include <sys/proc.h>
#include <sys/resource.h>
#include <sys/sysctl.h>

#include <err.h>
#include <errno.h>
#include <kvm.h>
#include <math.h>
#include <nlist.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include "ps.h"

struct	nlist psnl[] = {
	{ "_fscale" },
#define	X_FSCALE	0
	{ "_ccpu" },
#define	X_CCPU		1
	{ "_physmem" },
#define	X_PHYSMEM	2
	{ "_maxslp" },
#define	X_MAXSLP	3
	{ NULL }
};

double	ccpu;				/* kernel _ccpu variable */
int	nlistread;			/* if nlist already read. */
int	mempages;			/* number of pages of phys. memory */
int	fscale;				/* kernel _fscale variable */
int	maxslp;				/* kernel _maxslp variable */
int	uspace;				/* kernel USPACE value */

#define kread(x, v) \
	kvm_read(kd, psnl[x].n_value, (char *)&v, sizeof v) != sizeof(v)

int
donlist()
{
	int rval;
	fixpt_t xccpu;

	rval = 0;
	nlistread = 1;
	if (kvm_nlist(kd, psnl)) {
		nlisterr(psnl);
		eval = 1;
		return (1);
	}
	if (kread(X_FSCALE, fscale)) {
		warnx("fscale: %s", kvm_geterr(kd));
		eval = rval = 1;
	}
	if (kread(X_PHYSMEM, mempages)) {
		warnx("avail_start: %s", kvm_geterr(kd));
		eval = rval = 1;
	}
	if (kread(X_CCPU, xccpu)) {
		warnx("ccpu: %s", kvm_geterr(kd));
		eval = rval = 1;
	}
	if (kread(X_MAXSLP, maxslp)) {
		warnx("maxslp: %s", kvm_geterr(kd));
		eval = rval = 1;
	}
	ccpu = (double)xccpu / fscale;
	return (rval);
}

int
donlist_sysctl()
{
	int mib[2];
	size_t size;
	fixpt_t xccpu;

	nlistread = 1;
	mib[0] = CTL_HW;
	mib[1] = HW_PHYSMEM;
	size = sizeof(mempages);
	if (sysctl(mib, 2, &mempages, &size, NULL, 0) == 0)
		mempages /= getpagesize();
	else
		mempages = 0;

	mib[0] = CTL_KERN;
	mib[1] = KERN_FSCALE;
	size = sizeof(fscale);
	if (sysctl(mib, 2, &fscale, &size, NULL, 0) == -1)
		fscale = (1 << 8);	/* XXX Hopefully reasonable default */

	mib[0] = CTL_KERN;
	mib[1] = KERN_CCPU;
	size = sizeof(xccpu);
	if (sysctl(mib, 2, &xccpu, &size, NULL, 0) == -1)
		ccpu = exp(-1.0 / 20.0); /* XXX Hopefully reasonable default */
	else
		ccpu = (double)xccpu / fscale;

	mib[0] = CTL_VM;
	mib[1] = VM_MAXSLP;
	size = sizeof(maxslp);
	if (sysctl(mib, 2, &maxslp, &size, NULL, 0) == -1)
#ifdef MAXSLP
		maxslp = MAXSLP;
#else
		maxslp = 20;		/* XXX Hopefully reasonable default */
#endif

	mib[0] = CTL_VM;
	mib[1] = VM_USPACE;
	size = sizeof(maxslp);
	if (sysctl(mib, 2, &maxslp, &size, NULL, 0) == -1)
#ifdef USPACE
		uspace = USPACE;
#else
		uspace = getpagesize();	/* XXX Hopefully reasonable default */
#endif

	return 0;
}

void
nlisterr(nl)
	struct nlist nl[];
{
	int i;

	(void)fprintf(stderr, "ps: nlist: can't find following symbols:");
	for (i = 0; nl[i].n_name != NULL; i++)
		if (nl[i].n_value == 0)
			(void)fprintf(stderr, " %s", nl[i].n_name);
	(void)fprintf(stderr, "\n");
}