/*      $NetBSD: pigs.c,v 1.34 2021/11/09 09:18:02 nia 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.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)pigs.c      8.2 (Berkeley) 9/23/93";
#endif
__RCSID("$NetBSD: pigs.c,v 1.34 2021/11/09 09:18:02 nia Exp $");
#endif /* not lint */

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

#include <sys/param.h>
#include <sys/sched.h>
#include <sys/sysctl.h>

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

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

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

int nproc;
struct p_times *pt;

uint64_t stime[CPUSTATES];
uint64_t mempages;
int     fscale;
double  lccpu;

#ifndef P_ZOMBIE
#define P_ZOMBIE(p)     ((p)->p_stat == SZOMB)
#endif

WINDOW *
openpigs(void)
{

        return (subwin(stdscr, -1, 0, 5, 0));
}

void
closepigs(WINDOW *w)
{

        if (w == NULL)
                return;
        wclear(w);
        wrefresh(w);
        delwin(w);
}


void
showpigs(void)
{
        int i, y, k;
        struct kinfo_proc2 *kp;
        float total;
        int factor;
        const char *pname;
        char pidname[30], pidstr[7], usrstr[9];

        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), compare_pctcpu);
        y = 1;
        i = nproc + 1;
        if (i > getmaxy(wnd)-1)
                i = getmaxy(wnd)-1;
        for (k = 0; i > 0 && pt[k].pt_pctcpu > 0.01; i--, y++, k++) {
                if (pt[k].pt_kp == NULL) {
                        pname = "<idle>";
                        pidstr[0] = '\0';
                        usrstr[0] = '\0';
                }
                else {
                        kp = pt[k].pt_kp;
                        pname = kp->p_comm;
                        snprintf(pidstr, sizeof(pidstr), "%5d", kp->p_pid);
                        snprintf(usrstr, sizeof(usrstr), "%8s",
                            user_from_uid(kp->p_uid, 0));
                }
                wmove(wnd, y, 0);
                wclrtoeol(wnd);
                mvwaddstr(wnd, y, 0, usrstr);
                mvwaddstr(wnd, y, 9, pidstr);
                (void)snprintf(pidname, sizeof(pidname), "%9.9s", pname);
                mvwaddstr(wnd, y, 15, pidname);
                mvwhline(wnd, y, 25, 'X', pt[k].pt_pctcpu*factor + 0.5);
        }
        wmove(wnd, y, 0); wclrtobot(wnd);
}

int
initpigs(void)
{
        fixpt_t ccpu;
        size_t len;

        (void) fetch_cptime(stime);

        len = sizeof(mempages);
        if (sysctlbyname("hw.physmem64", &mempages, &len, NULL, 0))
                error("can't get \"hw.physmem64\": %s", strerror(errno));

        len = sizeof(ccpu);
        if (sysctlbyname("kern.ccpu", &ccpu, &len, NULL, 0))
                error("can't get \"kern.ccpu\": %s", strerror(errno));

        len = sizeof(fscale);
        if (sysctlbyname("kern.fscale", &fscale, &len, NULL, 0))
                error("can't get \"kern.fscale\": %s", strerror(errno));

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

        return(1);
}

void
fetchpigs(void)
{
        int i;
        float *pctp;
        struct kinfo_proc2 *kpp, *k;
        u_int64_t cputime[CPUSTATES];
        double t;
        static int lastnproc = 0;

        if ((kpp = kvm_getproc2(kd, KERN_PROC_ALL, 0, sizeof(*kpp),
                                &nproc)) == NULL) {
                error("%s", kvm_geterr(kd));
                free(pt);
                return;
        }
        if (nproc > lastnproc) {
                if (reallocarr(&pt, nproc + 1, sizeof(struct p_times)) != 0) {
                        error("Out of memory");
                        die(0);
                }
        }
        lastnproc = nproc;
        /*
         * calculate %cpu for each proc
         */
        for (i = 0; i < nproc; i++) {
                pt[i].pt_kp = k = &kpp[i];
                pctp = &pt[i].pt_pctcpu;

                if (k->p_swtime == 0 || k->p_stat == SZOMB)
                        *pctp = 0;
                else
                        *pctp = ((double) k->p_pctcpu / 
                                    fscale) / (1.0 - exp(k->p_swtime * lccpu));
        }
        /*
         * and for the imaginary "idle" process
         */
        (void) fetch_cptime(cputime);
        t = 0;
        for (i = 0; i < CPUSTATES; i++)
                t += cputime[i] - stime[i];
        if (t == 0.0)
                t = 1.0;
        pt[nproc].pt_kp = NULL;
        pt[nproc].pt_pctcpu = (cputime[CP_IDLE] - stime[CP_IDLE]) / t;
        for (i = 0; i < CPUSTATES; i++)
                stime[i] = cputime[i];
}

void
labelpigs(void)
{
        wmove(wnd, 0, 0);
        wclrtoeol(wnd);
        mvwaddstr(wnd, 0, 25, "/0   /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
}

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