/*	$OpenBSD: pigs.c,v 1.20 2007/02/25 18:21:24 deraadt Exp $	*/
/*	$NetBSD: pigs.c,v 1.3 1995/04/29 05:54:50 cgd Exp $	*/

/*-
 * Copyright (c) 1980, 1992, 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.
 * 3. 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.
 */

#ifndef lint
#if 0
static char sccsid[] = "@(#)pigs.c	8.2 (Berkeley) 9/23/93";
#endif
static char rcsid[] = "$OpenBSD: pigs.c,v 1.20 2007/02/25 18:21:24 deraadt Exp $";
#endif /* not lint */

/*
 * Pigs display from Bill Reeves at Lucasfilm
 */

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

#include <curses.h>
#include <math.h>
#include <pwd.h>
#include <err.h>
#include <stdlib.h>
#include <string.h>

#include "extern.h"
#include "systat.h"

int compar(const void *, const void *);

static int nproc;
static struct p_times {
	float pt_pctcpu;
	struct kinfo_proc2 *pt_kp;
} *pt;

static long stime[CPUSTATES];
static double  lccpu;

WINDOW *
openpigs(void)
{
	return (subwin(stdscr, LINES-1-2, 0, 2, 0));
}

void
closepigs(WINDOW *w)
{
	if (w == NULL)
		return;
	wclear(w);
	wrefresh(w);
	delwin(w);
}


void
showpigs(void)
{
	int i, j, y, k;
	struct kinfo_proc2 *kp;
	float total;
	int factor;
	char *uname, *pname, pidname[30];

	if (pt == NULL)
		return;
	/* Accumulate the percent of cpu per user. */
	total = 0.0;
	for (i = 0; i <= nproc; i++) {
		/* Accumulate the percentage. */
		total += pt[i].pt_pctcpu;
	}

	if (total < 1.0)
		total = 1.0;
	factor = 50.0/total;

	qsort(pt, nproc + 1, sizeof (struct p_times), compar);
	y = 1;
	i = nproc + 1;
	if (i > wnd->_maxy-1)
		i = wnd->_maxy-1;
	for (k = 0; i > 0 && pt[k].pt_pctcpu > 0.01; i--, y++, k++) {
		kp = pt[k].pt_kp;
		if (kp == NULL) {
			uname = "";
			pname = "<idle>";
		} else {
			uname = user_from_uid(kp->p_uid, 0);
			pname = kp->p_comm;
		}
		wmove(wnd, y, 0);
		wclrtoeol(wnd);
		mvwaddstr(wnd, y, 0, uname);
		snprintf(pidname, sizeof pidname, "%10.10s", pname);
		mvwaddstr(wnd, y, 9, pidname);
		wmove(wnd, y, 20);
		for (j = pt[k].pt_pctcpu*factor + 0.5; j > 0; j--)
			waddch(wnd, 'X');
	}
	wmove(wnd, y, 0); wclrtobot(wnd);
}

struct loadavg sysload;

int
initpigs(void)
{
	static int sysload_mib[] = {CTL_VM, VM_LOADAVG};
	static int cp_time_mib[] = { CTL_KERN, KERN_CPTIME };
	static int ccpu_mib[] = { CTL_KERN, KERN_CCPU };
	size_t size;
	fixpt_t ccpu;

	size = sizeof(stime);
	(void) sysctl(cp_time_mib, 2, &stime, &size, NULL, 0);

	size = sizeof(sysload);
	(void) sysctl(sysload_mib, 2, &sysload, &size, NULL, 0);

	size = sizeof(ccpu);
	(void) sysctl(ccpu_mib, 2, &ccpu, &size, NULL, 0);

	lccpu = log((double) ccpu / sysload.fscale);

	return(1);
}

void
fetchpigs(void)
{
	static int cp_time_mib[] = { CTL_KERN, KERN_CPTIME };
	static int lastnproc = 0;
	struct kinfo_proc2 *kpp;
	long ctime[CPUSTATES];
	double t;
	int i;
	size_t size;
	float *pctp;

	kpp = kvm_getproc2(kd, KERN_PROC_KTHREAD, 0, sizeof(*kpp), &nproc);
	if (kpp == NULL) {
		error("%s", kvm_geterr(kd));
		if (pt)
			free(pt);
		return;
	}
	if (nproc > lastnproc) {
		free(pt);
		if ((pt =
		    malloc((nproc + 1) * sizeof(struct p_times))) == NULL) {
			error("Out of memory");
			die();
		}
	}
	lastnproc = nproc;
	/*
	 * calculate %cpu for each proc
	 */
	for (i = 0; i < nproc; i++) {
		pt[i].pt_kp = &kpp[i];
		pctp = &pt[i].pt_pctcpu;
		if (kpp->p_swtime == 0)
			*pctp = 0;
		else
			*pctp = ((double) kpp->p_pctcpu / sysload.fscale) /
			    (1.0 - exp(kpp->p_swtime * lccpu));
	}
	/*
	 * and for the imaginary "idle" process
	 */
	size = sizeof(ctime);
	(void) sysctl(cp_time_mib, 2, &ctime, &size, NULL, 0);

	t = 0;
	for (i = 0; i < CPUSTATES; i++)
		t += ctime[i] - stime[i];
	if (t == 0.0)
		t = 1.0;
	pt[nproc].pt_kp = NULL;
	pt[nproc].pt_pctcpu = (ctime[CP_IDLE] - stime[CP_IDLE]) / t;
	for (i = 0; i < CPUSTATES; i++)
		stime[i] = ctime[i];
}

void
labelpigs(void)
{
	wmove(wnd, 0, 0);
	wclrtoeol(wnd);
	mvwaddstr(wnd, 0, 20,
	    "/0   /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
}

int
compar(const void *a, const void *b)
{
	return (((struct p_times *)a)->pt_pctcpu >
	    ((struct p_times *)b)->pt_pctcpu) ? -1 : 1;
}