llvm-libunwind: use conventional (non-Darwin) X86 register numbers

[freebsd-src.git] / usr.bin / top / machine.c

/*
 * top - a top users display for Unix
 *
 * SYNOPSIS:  For FreeBSD-2.x and later
 *
 * DESCRIPTION:
 * Originally written for BSD4.4 system by Christos Zoulas.
 * Ported to FreeBSD 2.x by Steven Wallace && Wolfram Schneider
 * Order support hacked in from top-3.5beta6/machine/m_aix41.c
 *   by Monte Mitzelfelt (for latest top see http://www.groupsys.com/topinfo/)
 *
 * This is the machine-dependent module for FreeBSD 2.2
 * Works for:
 *      FreeBSD 2.2.x, 3.x, 4.x, and probably FreeBSD 2.1.x
 *
 * LIBS: -lkvm
 *
 * AUTHOR:  Christos Zoulas <christos@ee.cornell.edu>
 *          Steven Wallace  <swallace@freebsd.org>
 *          Wolfram Schneider <wosch@FreeBSD.org>
 *          Thomas Moestl <tmoestl@gmx.net>
 *
 * $FreeBSD$
 */

#include <sys/param.h>
#include <sys/errno.h>
#include <sys/file.h>
#include <sys/proc.h>
#include <sys/resource.h>
#include <sys/rtprio.h>
#include <sys/signal.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/user.h>
#include <sys/vmmeter.h>

#include <err.h>
#include <kvm.h>
#include <math.h>
#include <nlist.h>
#include <paths.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <vis.h>

#include "top.h"
#include "machine.h"
#include "screen.h"
#include "utils.h"
#include "layout.h"

#define GETSYSCTL(name, var) getsysctl(name, &(var), sizeof(var))
#define SMPUNAMELEN     13
#define UPUNAMELEN      15

extern struct process_select ps;
extern char* printable(char *);
static int smpmode;
enum displaymodes displaymode;
#ifdef TOP_USERNAME_LEN
static int namelength = TOP_USERNAME_LEN;
#else
static int namelength = 8;
#endif
/* TOP_JID_LEN based on max of 999999 */
#define TOP_JID_LEN 7
static int jidlength;
static int cmdlengthdelta;

/* Prototypes for top internals */
void quit(int);

/* get_process_info passes back a handle.  This is what it looks like: */

struct handle {
        struct kinfo_proc **next_proc;  /* points to next valid proc pointer */
        int remaining;                  /* number of pointers remaining */
};

/* declarations for load_avg */
#include "loadavg.h"

/* define what weighted cpu is.  */
#define weighted_cpu(pct, pp) ((pp)->ki_swtime == 0 ? 0.0 : \
                         ((pct) / (1.0 - exp((pp)->ki_swtime * logcpu))))

/* what we consider to be process size: */
#define PROCSIZE(pp) ((pp)->ki_size / 1024)

#define RU(pp)  (&(pp)->ki_rusage)
#define RUTOT(pp) \
        (RU(pp)->ru_inblock + RU(pp)->ru_oublock + RU(pp)->ru_majflt)

#define PCTCPU(pp) (pcpu[pp - pbase])

/* definitions for indices in the nlist array */

/*
 *  These definitions control the format of the per-process area
 */

static char io_header[] =
    "  PID%*s %-*.*s   VCSW  IVCSW   READ  WRITE  FAULT  TOTAL PERCENT COMMAND";

#define io_Proc_format \
    "%5d%*s %-*.*s %6ld %6ld %6ld %6ld %6ld %6ld %6.2f%% %.*s"

static char smp_header_thr[] =
    "  PID%*s %-*.*s  THR PRI NICE   SIZE    RES STATE   C   TIME %7s COMMAND";
static char smp_header[] =
    "  PID%*s %-*.*s "   "PRI NICE   SIZE    RES STATE   C   TIME %7s COMMAND";

#define smp_Proc_format \
    "%5d%*s %-*.*s %s%3d %4s%7s %6s %-6.6s %2d%7s %6.2f%% %.*s"

static char up_header_thr[] =
    "  PID%*s %-*.*s  THR PRI NICE   SIZE    RES STATE    TIME %7s COMMAND";
static char up_header[] =
    "  PID%*s %-*.*s "   "PRI NICE   SIZE    RES STATE    TIME %7s COMMAND";

#define up_Proc_format \
    "%5d%*s %-*.*s %s%3d %4s%7s %6s %-6.6s%.0d%7s %6.2f%% %.*s"


/* process state names for the "STATE" column of the display */
/* the extra nulls in the string "run" are for adding a slash and
   the processor number when needed */

char *state_abbrev[] = {
        "", "START", "RUN\0\0\0", "SLEEP", "STOP", "ZOMB", "WAIT", "LOCK"
};


static kvm_t *kd;

/* values that we stash away in _init and use in later routines */

static double logcpu;

/* these are retrieved from the kernel in _init */

static load_avg  ccpu;

/* these are used in the get_ functions */

static int lastpid;

/* these are for calculating cpu state percentages */

static long cp_time[CPUSTATES];
static long cp_old[CPUSTATES];
static long cp_diff[CPUSTATES];

/* these are for detailing the process states */

int process_states[8];
char *procstatenames[] = {
        "", " starting, ", " running, ", " sleeping, ", " stopped, ",
        " zombie, ", " waiting, ", " lock, ",
        NULL
};

/* these are for detailing the cpu states */

int cpu_states[CPUSTATES];
char *cpustatenames[] = {
        "user", "nice", "system", "interrupt", "idle", NULL
};

/* these are for detailing the memory statistics */

int memory_stats[7];
char *memorynames[] = {
        "K Active, ", "K Inact, ", "K Wired, ", "K Cache, ", "K Buf, ",
        "K Free", NULL
};

int arc_stats[7];
char *arcnames[] = {
        "K Total, ", "K MFU, ", "K MRU, ", "K Anon, ", "K Header, ", "K Other",
        NULL
};

int swap_stats[7];
char *swapnames[] = {
        "K Total, ", "K Used, ", "K Free, ", "% Inuse, ", "K In, ", "K Out",
        NULL
};


/* these are for keeping track of the proc array */

static int nproc;
static int onproc = -1;
static int pref_len;
static struct kinfo_proc *pbase;
static struct kinfo_proc **pref;
static struct kinfo_proc *previous_procs;
static struct kinfo_proc **previous_pref;
static int previous_proc_count = 0;
static int previous_proc_count_max = 0;
static int previous_thread;

/* data used for recalculating pctcpu */
static double *pcpu;
static struct timespec proc_uptime;
static struct timeval proc_wall_time;
static struct timeval previous_wall_time;
static uint64_t previous_interval = 0;

/* total number of io operations */
static long total_inblock;
static long total_oublock;
static long total_majflt;

/* these are for getting the memory statistics */

static int arc_enabled;
static int pageshift;           /* log base 2 of the pagesize */

/* define pagetok in terms of pageshift */

#define pagetok(size) ((size) << pageshift)

/* useful externals */
long percentages();

#ifdef ORDER
/*
 * Sorting orders.  The first element is the default.
 */
char *ordernames[] = {
        "cpu", "size", "res", "time", "pri", "threads",
        "total", "read", "write", "fault", "vcsw", "ivcsw",
        "jid", "pid", NULL
};
#endif

/* Per-cpu time states */
static int maxcpu;
static int maxid;
static int ncpus;
static u_long cpumask;
static long *times;
static long *pcpu_cp_time;
static long *pcpu_cp_old;
static long *pcpu_cp_diff;
static int *pcpu_cpu_states;

static int compare_jid(const void *a, const void *b);
static int compare_pid(const void *a, const void *b);
static int compare_tid(const void *a, const void *b);
static const char *format_nice(const struct kinfo_proc *pp);
static void getsysctl(const char *name, void *ptr, size_t len);
static int swapmode(int *retavail, int *retfree);
static void update_layout(void);

void
toggle_pcpustats(void)
{

        if (ncpus == 1)
                return;
        update_layout();
}

/* Adjust display based on ncpus and the ARC state. */
static void
update_layout(void)
{

        y_mem = 3;
        y_arc = 4;
        y_swap = 4 + arc_enabled;
        y_idlecursor = 5 + arc_enabled;
        y_message = 5 + arc_enabled;
        y_header = 6 + arc_enabled;
        y_procs = 7 + arc_enabled;
        Header_lines = 7 + arc_enabled;

        if (pcpu_stats) {
                y_mem += ncpus - 1;
                y_arc += ncpus - 1;
                y_swap += ncpus - 1;
                y_idlecursor += ncpus - 1;
                y_message += ncpus - 1;
                y_header += ncpus - 1;
                y_procs += ncpus - 1;
                Header_lines += ncpus - 1;
        }
}

int
machine_init(struct statics *statics, char do_unames)
{
        int i, j, empty, pagesize;
        uint64_t arc_size;
        size_t size;
        struct passwd *pw;

        size = sizeof(smpmode);
        if ((sysctlbyname("machdep.smp_active", &smpmode, &size,
            NULL, 0) != 0 &&
            sysctlbyname("kern.smp.active", &smpmode, &size,
            NULL, 0) != 0) ||
            size != sizeof(smpmode))
                smpmode = 0;

        size = sizeof(arc_size);
        if (sysctlbyname("kstat.zfs.misc.arcstats.size", &arc_size, &size,
            NULL, 0) == 0 && arc_size != 0)
                arc_enabled = 1;

        if (do_unames) {
            while ((pw = getpwent()) != NULL) {
                if (strlen(pw->pw_name) > namelength)
                        namelength = strlen(pw->pw_name);
            }
        }
        if (smpmode && namelength > SMPUNAMELEN)
                namelength = SMPUNAMELEN;
        else if (namelength > UPUNAMELEN)
                namelength = UPUNAMELEN;

        kd = kvm_open(NULL, _PATH_DEVNULL, NULL, O_RDONLY, "kvm_open");
        if (kd == NULL)
                return (-1);

        GETSYSCTL("kern.ccpu", ccpu);

        /* this is used in calculating WCPU -- calculate it ahead of time */
        logcpu = log(loaddouble(ccpu));

        pbase = NULL;
        pref = NULL;
        pcpu = NULL;
        nproc = 0;
        onproc = -1;

        /* get the page size and calculate pageshift from it */
        pagesize = getpagesize();
        pageshift = 0;
        while (pagesize > 1) {
                pageshift++;
                pagesize >>= 1;
        }

        /* we only need the amount of log(2)1024 for our conversion */
        pageshift -= LOG1024;

        /* fill in the statics information */
        statics->procstate_names = procstatenames;
        statics->cpustate_names = cpustatenames;
        statics->memory_names = memorynames;
        if (arc_enabled)
                statics->arc_names = arcnames;
        else
                statics->arc_names = NULL;
        statics->swap_names = swapnames;
#ifdef ORDER
        statics->order_names = ordernames;
#endif

        /* Allocate state for per-CPU stats. */
        cpumask = 0;
        ncpus = 0;
        GETSYSCTL("kern.smp.maxcpus", maxcpu);
        size = sizeof(long) * maxcpu * CPUSTATES;
        times = malloc(size);
        if (times == NULL)
                err(1, "malloc %zu bytes", size);
        if (sysctlbyname("kern.cp_times", times, &size, NULL, 0) == -1)
                err(1, "sysctlbyname kern.cp_times");
        pcpu_cp_time = calloc(1, size);
        maxid = (size / CPUSTATES / sizeof(long)) - 1;
        for (i = 0; i <= maxid; i++) {
                empty = 1;
                for (j = 0; empty && j < CPUSTATES; j++) {
                        if (times[i * CPUSTATES + j] != 0)
                                empty = 0;
                }
                if (!empty) {
                        cpumask |= (1ul << i);
                        ncpus++;
                }
        }
        size = sizeof(long) * ncpus * CPUSTATES;
        pcpu_cp_old = calloc(1, size);
        pcpu_cp_diff = calloc(1, size);
        pcpu_cpu_states = calloc(1, size);
        statics->ncpus = ncpus;

        update_layout();

        /* all done! */
        return (0);
}

char *
format_header(char *uname_field)
{
        static char Header[128];
        const char *prehead;
        
        if (ps.jail)
                jidlength = TOP_JID_LEN + 1;    /* +1 for extra left space. */
        else
                jidlength = 0;

        switch (displaymode) {
        case DISP_CPU:
                /*
                 * The logic of picking the right header format seems reverse
                 * here because we only want to display a THR column when
                 * "thread mode" is off (and threads are not listed as
                 * separate lines).
                 */
                prehead = smpmode ?
                    (ps.thread ? smp_header : smp_header_thr) :
                    (ps.thread ? up_header : up_header_thr);
                snprintf(Header, sizeof(Header), prehead,
                    jidlength, ps.jail ? " JID" : "",
                    namelength, namelength, uname_field,
                    ps.wcpu ? "WCPU" : "CPU");
                break;
        case DISP_IO:
                prehead = io_header;
                snprintf(Header, sizeof(Header), prehead,
                    jidlength, ps.jail ? " JID" : "",
                    namelength, namelength, uname_field);
                break;
        }
        cmdlengthdelta = strlen(Header) - 7;
        return (Header);
}

static int swappgsin = -1;
static int swappgsout = -1;
extern struct timeval timeout;


void
get_system_info(struct system_info *si)
{
        long total;
        struct loadavg sysload;
        int mib[2];
        struct timeval boottime;
        uint64_t arc_stat, arc_stat2;
        int i, j;
        size_t size;

        /* get the CPU stats */
        size = (maxid + 1) * CPUSTATES * sizeof(long);
        if (sysctlbyname("kern.cp_times", pcpu_cp_time, &size, NULL, 0) == -1)
                err(1, "sysctlbyname kern.cp_times");
        GETSYSCTL("kern.cp_time", cp_time);
        GETSYSCTL("vm.loadavg", sysload);
        GETSYSCTL("kern.lastpid", lastpid);

        /* convert load averages to doubles */
        for (i = 0; i < 3; i++)
                si->load_avg[i] = (double)sysload.ldavg[i] / sysload.fscale;

        /* convert cp_time counts to percentages */
        for (i = j = 0; i <= maxid; i++) {
                if ((cpumask & (1ul << i)) == 0)
                        continue;
                percentages(CPUSTATES, &pcpu_cpu_states[j * CPUSTATES],
                    &pcpu_cp_time[j * CPUSTATES],
                    &pcpu_cp_old[j * CPUSTATES],
                    &pcpu_cp_diff[j * CPUSTATES]);
                j++;
        }
        percentages(CPUSTATES, cpu_states, cp_time, cp_old, cp_diff);

        /* sum memory & swap statistics */
        {
                static unsigned int swap_delay = 0;
                static int swapavail = 0;
                static int swapfree = 0;
                static long bufspace = 0;
                static int nspgsin, nspgsout;

                GETSYSCTL("vfs.bufspace", bufspace);
                GETSYSCTL("vm.stats.vm.v_active_count", memory_stats[0]);
                GETSYSCTL("vm.stats.vm.v_inactive_count", memory_stats[1]);
                GETSYSCTL("vm.stats.vm.v_wire_count", memory_stats[2]);
                GETSYSCTL("vm.stats.vm.v_cache_count", memory_stats[3]);
                GETSYSCTL("vm.stats.vm.v_free_count", memory_stats[5]);
                GETSYSCTL("vm.stats.vm.v_swappgsin", nspgsin);
                GETSYSCTL("vm.stats.vm.v_swappgsout", nspgsout);
                /* convert memory stats to Kbytes */
                memory_stats[0] = pagetok(memory_stats[0]);
                memory_stats[1] = pagetok(memory_stats[1]);
                memory_stats[2] = pagetok(memory_stats[2]);
                memory_stats[3] = pagetok(memory_stats[3]);
                memory_stats[4] = bufspace / 1024;
                memory_stats[5] = pagetok(memory_stats[5]);
                memory_stats[6] = -1;

                /* first interval */
                if (swappgsin < 0) {
                        swap_stats[4] = 0;
                        swap_stats[5] = 0;
                }

                /* compute differences between old and new swap statistic */
                else {
                        swap_stats[4] = pagetok(((nspgsin - swappgsin)));
                        swap_stats[5] = pagetok(((nspgsout - swappgsout)));
                }

                swappgsin = nspgsin;
                swappgsout = nspgsout;

                /* call CPU heavy swapmode() only for changes */
                if (swap_stats[4] > 0 || swap_stats[5] > 0 || swap_delay == 0) {
                        swap_stats[3] = swapmode(&swapavail, &swapfree);
                        swap_stats[0] = swapavail;
                        swap_stats[1] = swapavail - swapfree;
                        swap_stats[2] = swapfree;
                }
                swap_delay = 1;
                swap_stats[6] = -1;
        }

        if (arc_enabled) {
                GETSYSCTL("kstat.zfs.misc.arcstats.size", arc_stat);
                arc_stats[0] = arc_stat >> 10;
                GETSYSCTL("vfs.zfs.mfu_size", arc_stat);
                arc_stats[1] = arc_stat >> 10;
                GETSYSCTL("vfs.zfs.mru_size", arc_stat);
                arc_stats[2] = arc_stat >> 10;
                GETSYSCTL("vfs.zfs.anon_size", arc_stat);
                arc_stats[3] = arc_stat >> 10;
                GETSYSCTL("kstat.zfs.misc.arcstats.hdr_size", arc_stat);
                GETSYSCTL("kstat.zfs.misc.arcstats.l2_hdr_size", arc_stat2);
                arc_stats[4] = arc_stat + arc_stat2 >> 10;
                GETSYSCTL("kstat.zfs.misc.arcstats.other_size", arc_stat);
                arc_stats[5] = arc_stat >> 10;
                si->arc = arc_stats;
        }
                    
        /* set arrays and strings */
        if (pcpu_stats) {
                si->cpustates = pcpu_cpu_states;
                si->ncpus = ncpus;
        } else {
                si->cpustates = cpu_states;
                si->ncpus = 1;
        }
        si->memory = memory_stats;
        si->swap = swap_stats;


        if (lastpid > 0) {
                si->last_pid = lastpid;
        } else {
                si->last_pid = -1;
        }

        /*
         * Print how long system has been up.
         * (Found by looking getting "boottime" from the kernel)
         */
        mib[0] = CTL_KERN;
        mib[1] = KERN_BOOTTIME;
        size = sizeof(boottime);
        if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
            boottime.tv_sec != 0) {
                si->boottime = boottime;
        } else {
                si->boottime.tv_sec = -1;
        }
}

#define NOPROC  ((void *)-1)

/*
 * We need to compare data from the old process entry with the new
 * process entry.
 * To facilitate doing this quickly we stash a pointer in the kinfo_proc
 * structure to cache the mapping.  We also use a negative cache pointer
 * of NOPROC to avoid duplicate lookups.
 * XXX: this could be done when the actual processes are fetched, we do
 * it here out of laziness.
 */
const struct kinfo_proc *
get_old_proc(struct kinfo_proc *pp)
{
        struct kinfo_proc **oldpp, *oldp;

        /*
         * If this is the first fetch of the kinfo_procs then we don't have
         * any previous entries.
         */
        if (previous_proc_count == 0)
                return (NULL);
        /* negative cache? */
        if (pp->ki_udata == NOPROC)
                return (NULL);
        /* cached? */
        if (pp->ki_udata != NULL)
                return (pp->ki_udata);
        /*
         * Not cached,
         * 1) look up based on pid.
         * 2) compare process start.
         * If we fail here, then setup a negative cache entry, otherwise
         * cache it.
         */
        oldpp = bsearch(&pp, previous_pref, previous_proc_count,
            sizeof(*previous_pref), ps.thread ? compare_tid : compare_pid);
        if (oldpp == NULL) {
                pp->ki_udata = NOPROC;
                return (NULL);
        }
        oldp = *oldpp;
        if (bcmp(&oldp->ki_start, &pp->ki_start, sizeof(pp->ki_start)) != 0) {
                pp->ki_udata = NOPROC;
                return (NULL);
        }
        pp->ki_udata = oldp;
        return (oldp);
}

/*
 * Return the total amount of IO done in blocks in/out and faults.
 * store the values individually in the pointers passed in.
 */
long
get_io_stats(struct kinfo_proc *pp, long *inp, long *oup, long *flp,
    long *vcsw, long *ivcsw)
{
        const struct kinfo_proc *oldp;
        static struct kinfo_proc dummy;
        long ret;

        oldp = get_old_proc(pp);
        if (oldp == NULL) {
                bzero(&dummy, sizeof(dummy));
                oldp = &dummy;
        }
        *inp = RU(pp)->ru_inblock - RU(oldp)->ru_inblock;
        *oup = RU(pp)->ru_oublock - RU(oldp)->ru_oublock;
        *flp = RU(pp)->ru_majflt - RU(oldp)->ru_majflt;
        *vcsw = RU(pp)->ru_nvcsw - RU(oldp)->ru_nvcsw;
        *ivcsw = RU(pp)->ru_nivcsw - RU(oldp)->ru_nivcsw;
        ret =
            (RU(pp)->ru_inblock - RU(oldp)->ru_inblock) +
            (RU(pp)->ru_oublock - RU(oldp)->ru_oublock) +
            (RU(pp)->ru_majflt - RU(oldp)->ru_majflt);
        return (ret);
}

/*
 * If there was a previous update, use the delta in ki_runtime over
 * the previous interval to calculate pctcpu.  Otherwise, fall back
 * to using the kernel's ki_pctcpu.
 */
static double
proc_calc_pctcpu(struct kinfo_proc *pp)
{
        const struct kinfo_proc *oldp;

        if (previous_interval != 0) {
                oldp = get_old_proc(pp);
                if (oldp != NULL)
                        return ((double)(pp->ki_runtime - oldp->ki_runtime)
                            / previous_interval);

                /*
                 * If this process/thread was created during the previous
                 * interval, charge it's total runtime to the previous
                 * interval.
                 */
                else if (pp->ki_start.tv_sec > previous_wall_time.tv_sec ||
                    (pp->ki_start.tv_sec == previous_wall_time.tv_sec &&
                    pp->ki_start.tv_usec >= previous_wall_time.tv_usec))
                        return ((double)pp->ki_runtime / previous_interval);
        }
        return (pctdouble(pp->ki_pctcpu));
}

/*
 * Return true if this process has used any CPU time since the
 * previous update.
 */
static int
proc_used_cpu(struct kinfo_proc *pp)
{
        const struct kinfo_proc *oldp;

        oldp = get_old_proc(pp);
        if (oldp == NULL)
                return (PCTCPU(pp) != 0);
        return (pp->ki_runtime != oldp->ki_runtime ||
            RU(pp)->ru_nvcsw != RU(oldp)->ru_nvcsw ||
            RU(pp)->ru_nivcsw != RU(oldp)->ru_nivcsw);
}

/*
 * Return the total number of block in/out and faults by a process.
 */
long
get_io_total(struct kinfo_proc *pp)
{
        long dummy;

        return (get_io_stats(pp, &dummy, &dummy, &dummy, &dummy, &dummy));
}

static struct handle handle;

caddr_t
get_process_info(struct system_info *si, struct process_select *sel,
    int (*compare)(const void *, const void *))
{
        int i;
        int total_procs;
        long p_io;
        long p_inblock, p_oublock, p_majflt, p_vcsw, p_ivcsw;
        long nsec;
        int active_procs;
        struct kinfo_proc **prefp;
        struct kinfo_proc *pp;
        struct timespec previous_proc_uptime;

        /* these are copied out of sel for speed */
        int show_idle;
        int show_jid;
        int show_self;
        int show_system;
        int show_uid;
        int show_command;
        int show_kidle;

        /*
         * If thread state was toggled, don't cache the previous processes.
         */
        if (previous_thread != sel->thread)
                nproc = 0;
        previous_thread = sel->thread;

        /*
         * Save the previous process info.
         */
        if (previous_proc_count_max < nproc) {
                free(previous_procs);
                previous_procs = malloc(nproc * sizeof(*previous_procs));
                free(previous_pref);
                previous_pref = malloc(nproc * sizeof(*previous_pref));
                if (previous_procs == NULL || previous_pref == NULL) {
                        (void) fprintf(stderr, "top: Out of memory.\n");
                        quit(23);
                }
                previous_proc_count_max = nproc;
        }
        if (nproc) {
                for (i = 0; i < nproc; i++)
                        previous_pref[i] = &previous_procs[i];
                bcopy(pbase, previous_procs, nproc * sizeof(*previous_procs));
                qsort(previous_pref, nproc, sizeof(*previous_pref),
                    ps.thread ? compare_tid : compare_pid);
        }
        previous_proc_count = nproc;
        previous_proc_uptime = proc_uptime;
        previous_wall_time = proc_wall_time;
        previous_interval = 0;

        pbase = kvm_getprocs(kd, sel->thread ? KERN_PROC_ALL : KERN_PROC_PROC,
            0, &nproc);
        (void)gettimeofday(&proc_wall_time, NULL);
        if (clock_gettime(CLOCK_UPTIME, &proc_uptime) != 0)
                memset(&proc_uptime, 0, sizeof(proc_uptime));
        else if (previous_proc_uptime.tv_sec != 0 &&
            previous_proc_uptime.tv_nsec != 0) {
                previous_interval = (proc_uptime.tv_sec -
                    previous_proc_uptime.tv_sec) * 1000000;
                nsec = proc_uptime.tv_nsec - previous_proc_uptime.tv_nsec;
                if (nsec < 0) {
                        previous_interval -= 1000000;
                        nsec += 1000000000;
                }
                previous_interval += nsec / 1000;
        }
        if (nproc > onproc) {
                pref = realloc(pref, sizeof(*pref) * nproc);
                pcpu = realloc(pcpu, sizeof(*pcpu) * nproc);
                onproc = nproc;
        }
        if (pref == NULL || pbase == NULL || pcpu == NULL) {
                (void) fprintf(stderr, "top: Out of memory.\n");
                quit(23);
        }
        /* get a pointer to the states summary array */
        si->procstates = process_states;

        /* set up flags which define what we are going to select */
        show_idle = sel->idle;
        show_jid = sel->jid != -1;
        show_self = sel->self == -1;
        show_system = sel->system;
        show_uid = sel->uid != -1;
        show_command = sel->command != NULL;
        show_kidle = sel->kidle;

        /* count up process states and get pointers to interesting procs */
        total_procs = 0;
        active_procs = 0;
        total_inblock = 0;
        total_oublock = 0;
        total_majflt = 0;
        memset((char *)process_states, 0, sizeof(process_states));
        prefp = pref;
        for (pp = pbase, i = 0; i < nproc; pp++, i++) {

                if (pp->ki_stat == 0)
                        /* not in use */
                        continue;

                if (!show_self && pp->ki_pid == sel->self)
                        /* skip self */
                        continue;

                if (!show_system && (pp->ki_flag & P_SYSTEM))
                        /* skip system process */
                        continue;

                p_io = get_io_stats(pp, &p_inblock, &p_oublock, &p_majflt,
                    &p_vcsw, &p_ivcsw);
                total_inblock += p_inblock;
                total_oublock += p_oublock;
                total_majflt += p_majflt;
                total_procs++;
                process_states[pp->ki_stat]++;

                if (pp->ki_stat == SZOMB)
                        /* skip zombies */
                        continue;

                if (!show_kidle && pp->ki_tdflags & TDF_IDLETD)
                        /* skip kernel idle process */
                        continue;

                PCTCPU(pp) = proc_calc_pctcpu(pp);
                if (sel->thread && PCTCPU(pp) > 1.0)
                        PCTCPU(pp) = 1.0;
                if (displaymode == DISP_CPU && !show_idle &&
                    (!proc_used_cpu(pp) ||
                     pp->ki_stat == SSTOP || pp->ki_stat == SIDL))
                        /* skip idle or non-running processes */
                        continue;

                if (displaymode == DISP_IO && !show_idle && p_io == 0)
                        /* skip processes that aren't doing I/O */
                        continue;

                if (show_jid && pp->ki_jid != sel->jid)
                        /* skip proc. that don't belong to the selected JID */
                        continue;

                if (show_uid && pp->ki_ruid != (uid_t)sel->uid)
                        /* skip proc. that don't belong to the selected UID */
                        continue;

                *prefp++ = pp;
                active_procs++;
        }

        /* if requested, sort the "interesting" processes */
        if (compare != NULL)
                qsort(pref, active_procs, sizeof(*pref), compare);

        /* remember active and total counts */
        si->p_total = total_procs;
        si->p_active = pref_len = active_procs;

        /* pass back a handle */
        handle.next_proc = pref;
        handle.remaining = active_procs;
        return ((caddr_t)&handle);
}

static char fmt[512];   /* static area where result is built */

char *
format_next_process(caddr_t handle, char *(*get_userid)(int), int flags)
{
        struct kinfo_proc *pp;
        const struct kinfo_proc *oldp;
        long cputime;
        double pct;
        struct handle *hp;
        char status[16];
        int cpu, state;
        struct rusage ru, *rup;
        long p_tot, s_tot;
        char *proc_fmt, thr_buf[6], jid_buf[TOP_JID_LEN + 1];
        char *cmdbuf = NULL;
        char **args;
        const int cmdlen = 128;

        /* find and remember the next proc structure */
        hp = (struct handle *)handle;
        pp = *(hp->next_proc++);
        hp->remaining--;

        /* get the process's command name */
        if ((pp->ki_flag & P_INMEM) == 0) {
                /*
                 * Print swapped processes as <pname>
                 */
                size_t len;

                len = strlen(pp->ki_comm);
                if (len > sizeof(pp->ki_comm) - 3)
                        len = sizeof(pp->ki_comm) - 3;
                memmove(pp->ki_comm + 1, pp->ki_comm, len);
                pp->ki_comm[0] = '<';
                pp->ki_comm[len + 1] = '>';
                pp->ki_comm[len + 2] = '\0';
        }

        /*
         * Convert the process's runtime from microseconds to seconds.  This
         * time includes the interrupt time although that is not wanted here.
         * ps(1) is similarly sloppy.
         */
        cputime = (pp->ki_runtime + 500000) / 1000000;

        /* calculate the base for cpu percentages */
        pct = PCTCPU(pp);

        /* generate "STATE" field */
        switch (state = pp->ki_stat) {
        case SRUN:
                if (smpmode && pp->ki_oncpu != NOCPU)
                        sprintf(status, "CPU%d", pp->ki_oncpu);
                else
                        strcpy(status, "RUN");
                break;
        case SLOCK:
                if (pp->ki_kiflag & KI_LOCKBLOCK) {
                        sprintf(status, "*%.6s", pp->ki_lockname);
                        break;
                }
                /* fall through */
        case SSLEEP:
                if (pp->ki_wmesg != NULL) {
                        sprintf(status, "%.6s", pp->ki_wmesg);
                        break;
                }
                /* FALLTHROUGH */
        default:

                if (state >= 0 &&
                    state < sizeof(state_abbrev) / sizeof(*state_abbrev))
                        sprintf(status, "%.6s", state_abbrev[state]);
                else
                        sprintf(status, "?%5d", state);
                break;
        }

        cmdbuf = (char *)malloc(cmdlen + 1);
        if (cmdbuf == NULL) {
                warn("malloc(%d)", cmdlen + 1);
                return NULL;
        }

        if (!(flags & FMT_SHOWARGS)) {
                if (ps.thread && pp->ki_flag & P_HADTHREADS &&
                    pp->ki_tdname[0]) {
                        snprintf(cmdbuf, cmdlen, "%s{%s}", pp->ki_comm,
                            pp->ki_tdname);
                } else {
                        snprintf(cmdbuf, cmdlen, "%s", pp->ki_comm);
                }
        } else {
                if (pp->ki_flag & P_SYSTEM ||
                    pp->ki_args == NULL ||
                    (args = kvm_getargv(kd, pp, cmdlen)) == NULL ||
                    !(*args)) {
                        if (ps.thread && pp->ki_flag & P_HADTHREADS &&
                            pp->ki_tdname[0]) {
                                snprintf(cmdbuf, cmdlen,
                                    "[%s{%s}]", pp->ki_comm, pp->ki_tdname);
                        } else {
                                snprintf(cmdbuf, cmdlen,
                                    "[%s]", pp->ki_comm);
                        }
                } else {
                        char *src, *dst, *argbuf;
                        char *cmd;
                        size_t argbuflen;
                        size_t len;

                        argbuflen = cmdlen * 4;
                        argbuf = (char *)malloc(argbuflen + 1);
                        if (argbuf == NULL) {
                                warn("malloc(%zu)", argbuflen + 1);
                                free(cmdbuf);
                                return NULL;
                        }

                        dst = argbuf;

                        /* Extract cmd name from argv */
                        cmd = strrchr(*args, '/');
                        if (cmd == NULL)
                                cmd = *args;
                        else
                                cmd++;

                        for (; (src = *args++) != NULL; ) {
                                if (*src == '\0')
                                        continue;
                                len = (argbuflen - (dst - argbuf) - 1) / 4;
                                strvisx(dst, src,
                                    MIN(strlen(src), len),
                                    VIS_NL | VIS_CSTYLE);
                                while (*dst != '\0')
                                        dst++;
                                if ((argbuflen - (dst - argbuf) - 1) / 4 > 0)
                                        *dst++ = ' '; /* add delimiting space */
                        }
                        if (dst != argbuf && dst[-1] == ' ')
                                dst--;
                        *dst = '\0';

                        if (strcmp(cmd, pp->ki_comm) != 0) {
                                if (ps.thread && pp->ki_flag & P_HADTHREADS &&
                                    pp->ki_tdname[0])
                                        snprintf(cmdbuf, cmdlen,
                                            "%s (%s){%s}", argbuf, pp->ki_comm,
                                            pp->ki_tdname);
                                else
                                        snprintf(cmdbuf, cmdlen,
                                            "%s (%s)", argbuf, pp->ki_comm);
                        } else {
                                if (ps.thread && pp->ki_flag & P_HADTHREADS &&
                                    pp->ki_tdname[0])
                                        snprintf(cmdbuf, cmdlen,
                                            "%s{%s}", argbuf, pp->ki_tdname);
                                else
                                        strlcpy(cmdbuf, argbuf, cmdlen);
                        }
                        free(argbuf);
                }
        }

        if (ps.jail == 0) 
                jid_buf[0] = '\0';
        else
                snprintf(jid_buf, sizeof(jid_buf), "%*d",
                    jidlength - 1, pp->ki_jid);

        if (displaymode == DISP_IO) {
                oldp = get_old_proc(pp);
                if (oldp != NULL) {
                        ru.ru_inblock = RU(pp)->ru_inblock -
                            RU(oldp)->ru_inblock;
                        ru.ru_oublock = RU(pp)->ru_oublock -
                            RU(oldp)->ru_oublock;
                        ru.ru_majflt = RU(pp)->ru_majflt - RU(oldp)->ru_majflt;
                        ru.ru_nvcsw = RU(pp)->ru_nvcsw - RU(oldp)->ru_nvcsw;
                        ru.ru_nivcsw = RU(pp)->ru_nivcsw - RU(oldp)->ru_nivcsw;
                        rup = &ru;
                } else {
                        rup = RU(pp);
                }
                p_tot = rup->ru_inblock + rup->ru_oublock + rup->ru_majflt;
                s_tot = total_inblock + total_oublock + total_majflt;

                snprintf(fmt, sizeof(fmt), io_Proc_format,
                    pp->ki_pid,
                    jidlength, jid_buf,
                    namelength, namelength, (*get_userid)(pp->ki_ruid),
                    rup->ru_nvcsw,
                    rup->ru_nivcsw,
                    rup->ru_inblock,
                    rup->ru_oublock,
                    rup->ru_majflt,
                    p_tot,
                    s_tot == 0 ? 0.0 : (p_tot * 100.0 / s_tot),
                    screen_width > cmdlengthdelta ?
                    screen_width - cmdlengthdelta : 0,
                    printable(cmdbuf));

                free(cmdbuf);

                return (fmt);
        }

        /* format this entry */
        if (smpmode) {
                if (state == SRUN && pp->ki_oncpu != NOCPU)
                        cpu = pp->ki_oncpu;
                else
                        cpu = pp->ki_lastcpu;
        } else
                cpu = 0;
        proc_fmt = smpmode ? smp_Proc_format : up_Proc_format;
        if (ps.thread != 0)
                thr_buf[0] = '\0';
        else
                snprintf(thr_buf, sizeof(thr_buf), "%*d ",
                    (int)(sizeof(thr_buf) - 2), pp->ki_numthreads);

        snprintf(fmt, sizeof(fmt), proc_fmt,
            pp->ki_pid,
            jidlength, jid_buf,
            namelength, namelength, (*get_userid)(pp->ki_ruid),
            thr_buf,
            pp->ki_pri.pri_level - PZERO,
            format_nice(pp),
            format_k2(PROCSIZE(pp)),
            format_k2(pagetok(pp->ki_rssize)),
            status,
            cpu,
            format_time(cputime),
            ps.wcpu ? 100.0 * weighted_cpu(pct, pp) : 100.0 * pct,
            screen_width > cmdlengthdelta ? screen_width - cmdlengthdelta : 0,
            printable(cmdbuf));

        free(cmdbuf);

        /* return the result */
        return (fmt);
}

static void
getsysctl(const char *name, void *ptr, size_t len)
{
        size_t nlen = len;

        if (sysctlbyname(name, ptr, &nlen, NULL, 0) == -1) {
                fprintf(stderr, "top: sysctl(%s...) failed: %s\n", name,
                    strerror(errno));
                quit(23);
        }
        if (nlen != len) {
                fprintf(stderr, "top: sysctl(%s...) expected %lu, got %lu\n",
                    name, (unsigned long)len, (unsigned long)nlen);
                quit(23);
        }
}

static const char *
format_nice(const struct kinfo_proc *pp)
{
        const char *fifo, *kproc;
        int rtpri;
        static char nicebuf[4 + 1];

        fifo = PRI_NEED_RR(pp->ki_pri.pri_class) ? "" : "F";
        kproc = (pp->ki_flag & P_KPROC) ? "k" : "";
        switch (PRI_BASE(pp->ki_pri.pri_class)) {
        case PRI_ITHD:
                return ("-");
        case PRI_REALTIME:
                /*
                 * XXX: the kernel doesn't tell us the original rtprio and
                 * doesn't really know what it was, so to recover it we
                 * must be more chummy with the implementation than the
                 * implementation is with itself.  pri_user gives a
                 * constant "base" priority, but is only initialized
                 * properly for user threads.  pri_native gives what the
                 * kernel calls the "base" priority, but it isn't constant
                 * since it is changed by priority propagation.  pri_native
                 * also isn't properly initialized for all threads, but it
                 * is properly initialized for kernel realtime and idletime
                 * threads.  Thus we use pri_user for the base priority of
                 * user threads (it is always correct) and pri_native for
                 * the base priority of kernel realtime and idletime threads
                 * (there is nothing better, and it is usually correct).
                 *
                 * The field width and thus the buffer are too small for
                 * values like "kr31F", but such values shouldn't occur,
                 * and if they do then the tailing "F" is not displayed.
                 */
                rtpri = ((pp->ki_flag & P_KPROC) ? pp->ki_pri.pri_native :
                    pp->ki_pri.pri_user) - PRI_MIN_REALTIME;
                snprintf(nicebuf, sizeof(nicebuf), "%sr%d%s",
                    kproc, rtpri, fifo);
                break;
        case PRI_TIMESHARE:
                if (pp->ki_flag & P_KPROC)
                        return ("-");
                snprintf(nicebuf, sizeof(nicebuf), "%d", pp->ki_nice - NZERO);
                break;
        case PRI_IDLE:
                /* XXX: as above. */
                rtpri = ((pp->ki_flag & P_KPROC) ? pp->ki_pri.pri_native :
                    pp->ki_pri.pri_user) - PRI_MIN_IDLE;
                snprintf(nicebuf, sizeof(nicebuf), "%si%d%s",
                    kproc, rtpri, fifo);
                break;
        default:
                return ("?");
        }
        return (nicebuf);
}

/* comparison routines for qsort */

static int
compare_pid(const void *p1, const void *p2)
{
        const struct kinfo_proc * const *pp1 = p1;
        const struct kinfo_proc * const *pp2 = p2;

        if ((*pp2)->ki_pid < 0 || (*pp1)->ki_pid < 0)
                abort();

        return ((*pp1)->ki_pid - (*pp2)->ki_pid);
}

static int
compare_tid(const void *p1, const void *p2)
{
        const struct kinfo_proc * const *pp1 = p1;
        const struct kinfo_proc * const *pp2 = p2;

        if ((*pp2)->ki_tid < 0 || (*pp1)->ki_tid < 0)
                abort();

        return ((*pp1)->ki_tid - (*pp2)->ki_tid);
}

/*
 *  proc_compare - comparison function for "qsort"
 *      Compares the resource consumption of two processes using five
 *      distinct keys.  The keys (in descending order of importance) are:
 *      percent cpu, cpu ticks, state, resident set size, total virtual
 *      memory usage.  The process states are ordered as follows (from least
 *      to most important):  WAIT, zombie, sleep, stop, start, run.  The
 *      array declaration below maps a process state index into a number
 *      that reflects this ordering.
 */

static int sorted_state[] = {
        0,      /* not used             */
        3,      /* sleep                */
        1,      /* ABANDONED (WAIT)     */
        6,      /* run                  */
        5,      /* start                */
        2,      /* zombie               */
        4       /* stop                 */
};


#define ORDERKEY_PCTCPU(a, b) do { \
        double diff; \
        if (ps.wcpu) \
                diff = weighted_cpu(PCTCPU((b)), (b)) - \
                    weighted_cpu(PCTCPU((a)), (a)); \
        else \
                diff = PCTCPU((b)) - PCTCPU((a)); \
        if (diff != 0) \
                return (diff > 0 ? 1 : -1); \
} while (0)

#define ORDERKEY_CPTICKS(a, b) do { \
        int64_t diff = (int64_t)(b)->ki_runtime - (int64_t)(a)->ki_runtime; \
        if (diff != 0) \
                return (diff > 0 ? 1 : -1); \
} while (0)

#define ORDERKEY_STATE(a, b) do { \
        int diff = sorted_state[(b)->ki_stat] - sorted_state[(a)->ki_stat]; \
        if (diff != 0) \
                return (diff > 0 ? 1 : -1); \
} while (0)

#define ORDERKEY_PRIO(a, b) do { \
        int diff = (int)(b)->ki_pri.pri_level - (int)(a)->ki_pri.pri_level; \
        if (diff != 0) \
                return (diff > 0 ? 1 : -1); \
} while (0)

#define ORDERKEY_THREADS(a, b) do { \
        int diff = (int)(b)->ki_numthreads - (int)(a)->ki_numthreads; \
        if (diff != 0) \
                return (diff > 0 ? 1 : -1); \
} while (0)

#define ORDERKEY_RSSIZE(a, b) do { \
        long diff = (long)(b)->ki_rssize - (long)(a)->ki_rssize; \
        if (diff != 0) \
                return (diff > 0 ? 1 : -1); \
} while (0)

#define ORDERKEY_MEM(a, b) do { \
        long diff = (long)PROCSIZE((b)) - (long)PROCSIZE((a)); \
        if (diff != 0) \
                return (diff > 0 ? 1 : -1); \
} while (0)

#define ORDERKEY_JID(a, b) do { \
        int diff = (int)(b)->ki_jid - (int)(a)->ki_jid; \
        if (diff != 0) \
                return (diff > 0 ? 1 : -1); \
} while (0)

/* compare_cpu - the comparison function for sorting by cpu percentage */

int
#ifdef ORDER
compare_cpu(void *arg1, void *arg2)
#else
proc_compare(void *arg1, void *arg2)
#endif
{
        struct kinfo_proc *p1 = *(struct kinfo_proc **)arg1;
        struct kinfo_proc *p2 = *(struct kinfo_proc **)arg2;

        ORDERKEY_PCTCPU(p1, p2);
        ORDERKEY_CPTICKS(p1, p2);
        ORDERKEY_STATE(p1, p2);
        ORDERKEY_PRIO(p1, p2);
        ORDERKEY_RSSIZE(p1, p2);
        ORDERKEY_MEM(p1, p2);

        return (0);
}

#ifdef ORDER
/* "cpu" compare routines */
int compare_size(), compare_res(), compare_time(), compare_prio(),
    compare_threads();

/*
 * "io" compare routines.  Context switches aren't i/o, but are displayed
 * on the "io" display.
 */
int compare_iototal(), compare_ioread(), compare_iowrite(), compare_iofault(),
    compare_vcsw(), compare_ivcsw();

int (*compares[])() = {
        compare_cpu,
        compare_size,
        compare_res,
        compare_time,
        compare_prio,
        compare_threads,
        compare_iototal,
        compare_ioread,
        compare_iowrite,
        compare_iofault,
        compare_vcsw,
        compare_ivcsw,
        compare_jid,
        NULL
};

/* compare_size - the comparison function for sorting by total memory usage */

int
compare_size(void *arg1, void *arg2)
{
        struct kinfo_proc *p1 = *(struct kinfo_proc **)arg1;
        struct kinfo_proc *p2 = *(struct kinfo_proc **)arg2;

        ORDERKEY_MEM(p1, p2);
        ORDERKEY_RSSIZE(p1, p2);
        ORDERKEY_PCTCPU(p1, p2);
        ORDERKEY_CPTICKS(p1, p2);
        ORDERKEY_STATE(p1, p2);
        ORDERKEY_PRIO(p1, p2);

        return (0);
}

/* compare_res - the comparison function for sorting by resident set size */

int
compare_res(void *arg1, void *arg2)
{
        struct kinfo_proc *p1 = *(struct kinfo_proc **)arg1;
        struct kinfo_proc *p2 = *(struct kinfo_proc **)arg2;

        ORDERKEY_RSSIZE(p1, p2);
        ORDERKEY_MEM(p1, p2);
        ORDERKEY_PCTCPU(p1, p2);
        ORDERKEY_CPTICKS(p1, p2);
        ORDERKEY_STATE(p1, p2);
        ORDERKEY_PRIO(p1, p2);

        return (0);
}

/* compare_time - the comparison function for sorting by total cpu time */

int
compare_time(void *arg1, void *arg2)
{
        struct kinfo_proc *p1 = *(struct kinfo_proc **)arg1;
        struct kinfo_proc *p2 = *(struct kinfo_proc **)arg2;

        ORDERKEY_CPTICKS(p1, p2);
        ORDERKEY_PCTCPU(p1, p2);
        ORDERKEY_STATE(p1, p2);
        ORDERKEY_PRIO(p1, p2);
        ORDERKEY_RSSIZE(p1, p2);
        ORDERKEY_MEM(p1, p2);

        return (0);
}

/* compare_prio - the comparison function for sorting by priority */

int
compare_prio(void *arg1, void *arg2)
{
        struct kinfo_proc *p1 = *(struct kinfo_proc **)arg1;
        struct kinfo_proc *p2 = *(struct kinfo_proc **)arg2;

        ORDERKEY_PRIO(p1, p2);
        ORDERKEY_CPTICKS(p1, p2);
        ORDERKEY_PCTCPU(p1, p2);
        ORDERKEY_STATE(p1, p2);
        ORDERKEY_RSSIZE(p1, p2);
        ORDERKEY_MEM(p1, p2);

        return (0);
}

/* compare_threads - the comparison function for sorting by threads */
int
compare_threads(void *arg1, void *arg2)
{
        struct kinfo_proc *p1 = *(struct kinfo_proc **)arg1;
        struct kinfo_proc *p2 = *(struct kinfo_proc **)arg2;

        ORDERKEY_THREADS(p1, p2);
        ORDERKEY_PCTCPU(p1, p2);
        ORDERKEY_CPTICKS(p1, p2);
        ORDERKEY_STATE(p1, p2);
        ORDERKEY_PRIO(p1, p2);
        ORDERKEY_RSSIZE(p1, p2);
        ORDERKEY_MEM(p1, p2);

        return (0);
}

/* compare_jid - the comparison function for sorting by jid */
static int
compare_jid(const void *arg1, const void *arg2)
{
        struct kinfo_proc *p1 = *(struct kinfo_proc **)arg1;
        struct kinfo_proc *p2 = *(struct kinfo_proc **)arg2;

        ORDERKEY_JID(p1, p2);
        ORDERKEY_PCTCPU(p1, p2);
        ORDERKEY_CPTICKS(p1, p2);
        ORDERKEY_STATE(p1, p2);
        ORDERKEY_PRIO(p1, p2);
        ORDERKEY_RSSIZE(p1, p2);
        ORDERKEY_MEM(p1, p2);

        return (0);
}
#endif /* ORDER */

/* assorted comparison functions for sorting by i/o */

int
#ifdef ORDER
compare_iototal(void *arg1, void *arg2)
#else
io_compare(void *arg1, void *arg2)
#endif
{
        struct kinfo_proc *p1 = *(struct kinfo_proc **)arg1;
        struct kinfo_proc *p2 = *(struct kinfo_proc **)arg2;

        return (get_io_total(p2) - get_io_total(p1));
}

#ifdef ORDER
int
compare_ioread(void *arg1, void *arg2)
{
        struct kinfo_proc *p1 = *(struct kinfo_proc **)arg1;
        struct kinfo_proc *p2 = *(struct kinfo_proc **)arg2;
        long dummy, inp1, inp2;

        (void) get_io_stats(p1, &inp1, &dummy, &dummy, &dummy, &dummy);
        (void) get_io_stats(p2, &inp2, &dummy, &dummy, &dummy, &dummy);

        return (inp2 - inp1);
}

int
compare_iowrite(void *arg1, void *arg2)
{
        struct kinfo_proc *p1 = *(struct kinfo_proc **)arg1;
        struct kinfo_proc *p2 = *(struct kinfo_proc **)arg2;
        long dummy, oup1, oup2;

        (void) get_io_stats(p1, &dummy, &oup1, &dummy, &dummy, &dummy);
        (void) get_io_stats(p2, &dummy, &oup2, &dummy, &dummy, &dummy);

        return (oup2 - oup1);
}

int
compare_iofault(void *arg1, void *arg2)
{
        struct kinfo_proc *p1 = *(struct kinfo_proc **)arg1;
        struct kinfo_proc *p2 = *(struct kinfo_proc **)arg2;
        long dummy, flp1, flp2;

        (void) get_io_stats(p1, &dummy, &dummy, &flp1, &dummy, &dummy);
        (void) get_io_stats(p2, &dummy, &dummy, &flp2, &dummy, &dummy);

        return (flp2 - flp1);
}

int
compare_vcsw(void *arg1, void *arg2)
{
        struct kinfo_proc *p1 = *(struct kinfo_proc **)arg1;
        struct kinfo_proc *p2 = *(struct kinfo_proc **)arg2;
        long dummy, flp1, flp2;

        (void) get_io_stats(p1, &dummy, &dummy, &dummy, &flp1, &dummy);
        (void) get_io_stats(p2, &dummy, &dummy, &dummy, &flp2, &dummy);

        return (flp2 - flp1);
}

int
compare_ivcsw(void *arg1, void *arg2)
{
        struct kinfo_proc *p1 = *(struct kinfo_proc **)arg1;
        struct kinfo_proc *p2 = *(struct kinfo_proc **)arg2;
        long dummy, flp1, flp2;

        (void) get_io_stats(p1, &dummy, &dummy, &dummy, &dummy, &flp1);
        (void) get_io_stats(p2, &dummy, &dummy, &dummy, &dummy, &flp2);

        return (flp2 - flp1);
}
#endif /* ORDER */

/*
 * proc_owner(pid) - returns the uid that owns process "pid", or -1 if
 *              the process does not exist.
 *              It is EXTREMELY IMPORTANT that this function work correctly.
 *              If top runs setuid root (as in SVR4), then this function
 *              is the only thing that stands in the way of a serious
 *              security problem.  It validates requests for the "kill"
 *              and "renice" commands.
 */

int
proc_owner(int pid)
{
        int cnt;
        struct kinfo_proc **prefp;
        struct kinfo_proc *pp;

        prefp = pref;
        cnt = pref_len;
        while (--cnt >= 0) {
                pp = *prefp++;
                if (pp->ki_pid == (pid_t)pid)
                        return ((int)pp->ki_ruid);
        }
        return (-1);
}

static int
swapmode(int *retavail, int *retfree)
{
        int n;
        int pagesize = getpagesize();
        struct kvm_swap swapary[1];

        *retavail = 0;
        *retfree = 0;

#define CONVERT(v)      ((quad_t)(v) * pagesize / 1024)

        n = kvm_getswapinfo(kd, swapary, 1, 0);
        if (n < 0 || swapary[0].ksw_total == 0)
                return (0);

        *retavail = CONVERT(swapary[0].ksw_total);
        *retfree = CONVERT(swapary[0].ksw_total - swapary[0].ksw_used);

        n = (int)(swapary[0].ksw_used * 100.0 / swapary[0].ksw_total);
        return (n);
}