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[unix-history] / usr / src / usr.bin / vmstat / vmstat.c

/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.  The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980 Regents of the University of California.\n\
All rights reserved.\n";
#endif not lint

#ifndef lint
static char sccsid[] = "@(#)vmstat.c    5.9 (Berkeley) %G%";
#endif not lint

#include <stdio.h>
#include <ctype.h>
#include <nlist.h>

#include <sys/param.h>
#include <sys/file.h>
#include <sys/vm.h>
#include <sys/dkstat.h>
#include <sys/buf.h>
#include <sys/dir.h>
#include <sys/inode.h>
#include <sys/namei.h>
#include <sys/text.h>
#include <sys/malloc.h>

struct nlist nl[] = {
#define X_CPTIME        0
       { "_cp_time" },
#define X_RATE          1
       { "_rate" },
#define X_TOTAL         2
       { "_total" },
#define X_DEFICIT       3
       { "_deficit" },
#define X_FORKSTAT      4
       { "_forkstat" },
#define X_SUM           5
       { "_sum" },
#define X_FIRSTFREE     6
       { "_firstfree" },
#define X_MAXFREE       7
       { "_maxfree" },
#define X_BOOTTIME      8
       { "_boottime" },
#define X_DKXFER        9
       { "_dk_xfer" },
#define X_REC           10
       { "_rectime" },
#define X_PGIN          11
       { "_pgintime" },
#define X_HZ            12
       { "_hz" },
#define X_PHZ           13
       { "_phz" },
#define X_NCHSTATS      14
       { "_nchstats" },
#define X_INTRNAMES     15
       { "_intrnames" },
#define X_EINTRNAMES    16
       { "_eintrnames" },
#define X_INTRCNT       17
       { "_intrcnt" },
#define X_EINTRCNT      18
       { "_eintrcnt" },
#define X_DK_NDRIVE     19
       { "_dk_ndrive" },
#define X_XSTATS        20
       { "_xstats" },
#define X_KMEMSTAT      21
       { "_kmemstats" },
#define X_KMEMBUCKETS   22
       { "_bucket" },
#ifdef vax
#define X_MBDINIT       (X_XSTATS+1)
       { "_mbdinit" },
#define X_UBDINIT       (X_XSTATS+2)
       { "_ubdinit" },
#endif
#ifdef tahoe
#define X_VBDINIT       (X_XSTATS+1)
       { "_vbdinit" },
#define X_CKEYSTATS     (X_XSTATS+2)
       { "_ckeystats" },
#define X_DKEYSTATS     (X_XSTATS+3)
       { "_dkeystats" },
#endif
       { "" },
};

char    **dr_name;
int     *dr_select;
int     dk_ndrive;
int     ndrives = 0;
#ifdef vax
char    *defdrives[] = { "hp0", "hp1", "hp2",  0 };
#else
char    *defdrives[] = { 0 };
#endif
double  stat1();
int     firstfree, maxfree;
int     hz;
int     phz;
int     HZ;

struct {
       int     busy;
       long    time[CPUSTATES];
       long    *xfer;
       struct  vmmeter Rate;
       struct  vmtotal Total;
       struct  vmmeter Sum;
       struct  forkstat Forkstat;
       unsigned rectime;
       unsigned pgintime;
} s, s1, z;
#define rate            s.Rate
#define total           s.Total
#define sum             s.Sum
#define forkstat        s.Forkstat

struct  vmmeter osum;
int     deficit;
double  etime;
int     mf;
time_t  now, boottime;
int     printhdr();
int     lines = 1;

#define INTS(x) ((x) - (hz + phz))

main(argc, argv)
       int argc;
       char **argv;
{
       extern char *ctime();
       register i;
       int iter, nintv, iflag = 0;
       long t;
       char *arg, **cp, buf[BUFSIZ];

       nlist("/vmunix", nl);
       if(nl[0].n_type == 0) {
               fprintf(stderr, "no /vmunix namelist\n");
               exit(1);
       }
       mf = open("/dev/kmem", 0);
       if(mf < 0) {
               fprintf(stderr, "cannot open /dev/kmem\n");
               exit(1);
       }
       iter = 0;
       argc--, argv++;
       while (argc>0 && argv[0][0]=='-') {
               char *cp = *argv++;
               argc--;
               while (*++cp) switch (*cp) {

               case 't':
                       dotimes();
                       exit(0);

               case 'z':
                       close(mf);
                       mf = open("/dev/kmem", 2);
                       lseek(mf, (long)nl[X_SUM].n_value, L_SET);
                       write(mf, &z.Sum, sizeof z.Sum);
                       exit(0);

               case 'f':
                       doforkst();
                       exit(0);
               
               case 'm':
                       domem();
                       exit(0);

               case 's':
                       dosum();
                       exit(0);

               case 'i':
                       iflag++;
                       break;

               default:
                       fprintf(stderr,
                           "usage: vmstat [ -fsim ] [ interval ] [ count]\n");
                       exit(1);
               }
       }
       lseek(mf, (long)nl[X_FIRSTFREE].n_value, L_SET);
       read(mf, &firstfree, sizeof firstfree);
       lseek(mf, (long)nl[X_MAXFREE].n_value, L_SET);
       read(mf, &maxfree, sizeof maxfree);
       lseek(mf, (long)nl[X_BOOTTIME].n_value, L_SET);
       read(mf, &boottime, sizeof boottime);
       lseek(mf, (long)nl[X_HZ].n_value, L_SET);
       read(mf, &hz, sizeof hz);
       if (nl[X_PHZ].n_value != 0) {
               lseek(mf, (long)nl[X_PHZ].n_value, L_SET);
               read(mf, &phz, sizeof phz);
       }
       HZ = phz ? phz : hz;
       if (nl[X_DK_NDRIVE].n_value == 0) {
               fprintf(stderr, "dk_ndrive undefined in system\n");
               exit(1);
       }
       lseek(mf, nl[X_DK_NDRIVE].n_value, L_SET);
       read(mf, &dk_ndrive, sizeof (dk_ndrive));
       if (dk_ndrive <= 0) {
               fprintf(stderr, "dk_ndrive %d\n", dk_ndrive);
               exit(1);
       }
       dr_select = (int *)calloc(dk_ndrive, sizeof (int));
       dr_name = (char **)calloc(dk_ndrive, sizeof (char *));
#define allocate(e, t) \
   s./**/e = (t *)calloc(dk_ndrive, sizeof (t)); \
   s1./**/e = (t *)calloc(dk_ndrive, sizeof (t));
       allocate(xfer, long);
       for (arg = buf, i = 0; i < dk_ndrive; i++) {
               dr_name[i] = arg;
               sprintf(dr_name[i], "dk%d", i);
               arg += strlen(dr_name[i]) + 1;
       }
       read_names();
       time(&now);
       nintv = now - boottime;
       if (nintv <= 0 || nintv > 60*60*24*365*10) {
               fprintf(stderr,
                   "Time makes no sense... namelist must be wrong.\n");
               exit(1);
       }
       if (iflag) {
               dointr(nintv);
               exit(0);
       }
       /*
        * Choose drives to be displayed.  Priority
        * goes to (in order) drives supplied as arguments,
        * default drives.  If everything isn't filled
        * in and there are drives not taken care of,
        * display the first few that fit.
        */
       ndrives = 0;
       while (argc > 0 && !isdigit(argv[0][0])) {
               for (i = 0; i < dk_ndrive; i++) {
                       if (strcmp(dr_name[i], argv[0]))
                               continue;
                       dr_select[i] = 1;
                       ndrives++;
               }
               argc--, argv++;
       }
       for (i = 0; i < dk_ndrive && ndrives < 4; i++) {
               if (dr_select[i])
                       continue;
               for (cp = defdrives; *cp; cp++)
                       if (strcmp(dr_name[i], *cp) == 0) {
                               dr_select[i] = 1;
                               ndrives++;
                               break;
                       }
       }
       for (i = 0; i < dk_ndrive && ndrives < 4; i++) {
               if (dr_select[i])
                       continue;
               dr_select[i] = 1;
               ndrives++;
       }
       if (argc > 1)
               iter = atoi(argv[1]);
       signal(SIGCONT, printhdr);
loop:
       if (--lines == 0)
               printhdr();
       lseek(mf, (long)nl[X_CPTIME].n_value, L_SET);
       read(mf, s.time, sizeof s.time);
       lseek(mf, (long)nl[X_DKXFER].n_value, L_SET);
       read(mf, s.xfer, dk_ndrive * sizeof (long));
       if (nintv != 1)
               lseek(mf, (long)nl[X_SUM].n_value, L_SET);
       else
               lseek(mf, (long)nl[X_RATE].n_value, L_SET);
       read(mf, &rate, sizeof rate);
       lseek(mf, (long)nl[X_TOTAL].n_value, L_SET);
       read(mf, &total, sizeof total);
       osum = sum;
       lseek(mf, (long)nl[X_SUM].n_value, L_SET);
       read(mf, &sum, sizeof sum);
       lseek(mf, (long)nl[X_DEFICIT].n_value, L_SET);
       read(mf, &deficit, sizeof deficit);
       etime = 0;
       for (i=0; i < dk_ndrive; i++) {
               t = s.xfer[i];
               s.xfer[i] -= s1.xfer[i];
               s1.xfer[i] = t;
       }
       for (i=0; i < CPUSTATES; i++) {
               t = s.time[i];
               s.time[i] -= s1.time[i];
               s1.time[i] = t;
               etime += s.time[i];
       }
       if(etime == 0.)
               etime = 1.;
       printf("%2d%2d%2d", total.t_rq, total.t_dw+total.t_pw, total.t_sw);
#define pgtok(a) ((a)*NBPG/1024)
       printf("%6d%6d", pgtok(total.t_avm), pgtok(total.t_free));
       printf("%4d%3d", (rate.v_pgrec - (rate.v_xsfrec+rate.v_xifrec))/nintv,
           (rate.v_xsfrec+rate.v_xifrec)/nintv);
       printf("%4d", pgtok(rate.v_pgpgin)/nintv);
       printf("%4d%4d%4d%4d", pgtok(rate.v_pgpgout)/nintv,
           pgtok(rate.v_dfree)/nintv, pgtok(deficit), rate.v_scan/nintv);
       etime /= (float)HZ;
       for (i = 0; i < dk_ndrive; i++)
               if (dr_select[i])
                       stats(i);
       printf("%4d%4d%4d", INTS(rate.v_intr/nintv), rate.v_syscall/nintv,
           rate.v_swtch/nintv);
       for(i=0; i<CPUSTATES; i++) {
               float f = stat1(i);
               if (i == 0) {           /* US+NI */
                       i++;
                       f += stat1(i);
               }
               printf("%3.0f", f);
       }
       printf("\n");
       fflush(stdout);
       nintv = 1;
       if (--iter &&argc > 0) {
               sleep(atoi(argv[0]));
               goto loop;
       }
}

printhdr()
{
       register int i, j;

       printf(" procs     memory              page           ");
       i = (ndrives * 3 - 6) / 2;
       if (i < 0)
               i = 0;
       for (j = 0; j < i; j++)
               putchar(' ');
       printf("faults");
       i = ndrives * 3 - 6 - i;
       for (j = 0; j < i; j++)
               putchar(' ');
       printf("               cpu\n");
       printf(" r b w   avm   fre  re at  pi  po  fr  de  sr ");
       for (i = 0; i < dk_ndrive; i++)
               if (dr_select[i])
                       printf("%c%c ", dr_name[i][0], dr_name[i][2]);  
       printf(" in  sy  cs us sy id\n");
       lines = 19;
}

dotimes()
{

       lseek(mf, (long)nl[X_REC].n_value, L_SET);
       read(mf, &s.rectime, sizeof s.rectime);
       lseek(mf, (long)nl[X_PGIN].n_value, L_SET);
       read(mf, &s.pgintime, sizeof s.pgintime);
       lseek(mf, (long)nl[X_SUM].n_value, L_SET);
       read(mf, &sum, sizeof sum);
       printf("%d reclaims, %d total time (usec)\n", sum.v_pgrec, s.rectime);
       printf("average: %d usec / reclaim\n", s.rectime/sum.v_pgrec);
       printf("\n");
       printf("%d page ins, %d total time (msec)\n",sum.v_pgin, s.pgintime/10);
       printf("average: %8.1f msec / page in\n", s.pgintime/(sum.v_pgin*10.0));
}

#if defined(tahoe)
#include <tahoe/cpu.h>
#endif

dosum()
{
       struct nchstats nchstats;
       struct xstats xstats;
       long nchtotal;
#if defined(tahoe)
       struct keystats keystats;
#endif

       lseek(mf, (long)nl[X_SUM].n_value, L_SET);
       read(mf, &sum, sizeof sum);
       printf("%9d swap ins\n", sum.v_swpin);
       printf("%9d swap outs\n", sum.v_swpout);
       printf("%9d pages swapped in\n", sum.v_pswpin / CLSIZE);
       printf("%9d pages swapped out\n", sum.v_pswpout / CLSIZE);
       printf("%9d total address trans. faults taken\n", sum.v_faults);
       printf("%9d page ins\n", sum.v_pgin);
       printf("%9d page outs\n", sum.v_pgout);
       printf("%9d pages paged in\n", sum.v_pgpgin);
       printf("%9d pages paged out\n", sum.v_pgpgout);
       printf("%9d sequential process pages freed\n", sum.v_seqfree);
       printf("%9d total reclaims (%d%% fast)\n", sum.v_pgrec,
           pct(sum.v_fastpgrec, sum.v_pgrec));
       printf("%9d reclaims from free list\n", sum.v_pgfrec);
       printf("%9d intransit blocking page faults\n", sum.v_intrans);
       printf("%9d zero fill pages created\n", sum.v_nzfod / CLSIZE);
       printf("%9d zero fill page faults\n", sum.v_zfod / CLSIZE);
       printf("%9d executable fill pages created\n", sum.v_nexfod / CLSIZE);
       printf("%9d executable fill page faults\n", sum.v_exfod / CLSIZE);
       printf("%9d swap text pages found in free list\n", sum.v_xsfrec);
       printf("%9d inode text pages found in free list\n", sum.v_xifrec);
       printf("%9d file fill pages created\n", sum.v_nvrfod / CLSIZE);
       printf("%9d file fill page faults\n", sum.v_vrfod / CLSIZE);
       printf("%9d pages examined by the clock daemon\n", sum.v_scan);
       printf("%9d revolutions of the clock hand\n", sum.v_rev);
       printf("%9d pages freed by the clock daemon\n", sum.v_dfree / CLSIZE);
       printf("%9d cpu context switches\n", sum.v_swtch);
       printf("%9d device interrupts\n", sum.v_intr);
       printf("%9d software interrupts\n", sum.v_soft);
#ifdef vax
       printf("%9d pseudo-dma dz interrupts\n", sum.v_pdma);
#endif
       printf("%9d traps\n", sum.v_trap);
       printf("%9d system calls\n", sum.v_syscall);
       lseek(mf, (long)nl[X_NCHSTATS].n_value, 0);
       read(mf, &nchstats, sizeof nchstats);
       nchtotal = nchstats.ncs_goodhits + nchstats.ncs_badhits +
           nchstats.ncs_falsehits + nchstats.ncs_miss + nchstats.ncs_long;
       printf("%9d total name lookups", nchtotal);
       printf(" (cache hits %d%% system %d%% per-process)\n",
           pct(nchstats.ncs_goodhits, nchtotal),
           pct(nchstats.ncs_pass2, nchtotal));
       printf("%9s badhits %d, falsehits %d, toolong %d\n", "",
           nchstats.ncs_badhits, nchstats.ncs_falsehits, nchstats.ncs_long);
       lseek(mf, (long)nl[X_XSTATS].n_value, 0);
       read(mf, &xstats, sizeof xstats);
       printf("%9d total calls to xalloc (cache hits %d%%)\n",
           xstats.alloc, pct(xstats.alloc_cachehit, xstats.alloc));
       printf("%9s sticky %d flushed %d unused %d\n", "",
           xstats.alloc_inuse, xstats.alloc_cacheflush, xstats.alloc_unused);
       printf("%9d total calls to xfree", xstats.free);
       printf(" (sticky %d cached %d swapped %d)\n",
           xstats.free_inuse, xstats.free_cache, xstats.free_cacheswap);
#if defined(tahoe)
       lseek(mf, (long)nl[X_CKEYSTATS].n_value, 0);
       read(mf, &keystats, sizeof keystats);
       printf("%9d %s (free %d%% norefs %d%% taken %d%% shared %d%%)\n",
           keystats.ks_allocs, "code cache keys allocated",
           pct(keystats.ks_allocfree, keystats.ks_allocs),
           pct(keystats.ks_norefs, keystats.ks_allocs),
           pct(keystats.ks_taken, keystats.ks_allocs),
           pct(keystats.ks_shared, keystats.ks_allocs));
       lseek(mf, (long)nl[X_DKEYSTATS].n_value, 0);
       read(mf, &keystats, sizeof keystats);
       printf("%9d %s (free %d%% norefs %d%% taken %d%% shared %d%%)\n",
           keystats.ks_allocs, "data cache keys allocated",
           pct(keystats.ks_allocfree, keystats.ks_allocs),
           pct(keystats.ks_norefs, keystats.ks_allocs),
           pct(keystats.ks_taken, keystats.ks_allocs),
           pct(keystats.ks_shared, keystats.ks_allocs));
#endif
}

doforkst()
{

       lseek(mf, (long)nl[X_FORKSTAT].n_value, L_SET);
       read(mf, &forkstat, sizeof forkstat);
       printf("%d forks, %d pages, average=%.2f\n",
               forkstat.cntfork, forkstat.sizfork,
               (float) forkstat.sizfork / forkstat.cntfork);
       printf("%d vforks, %d pages, average=%.2f\n",
               forkstat.cntvfork, forkstat.sizvfork,
               (float)forkstat.sizvfork / forkstat.cntvfork);
}

stats(dn)
{

       if (dn >= dk_ndrive) {
               printf("  0");
               return;
       }
       printf("%3.0f", s.xfer[dn]/etime);
}

double
stat1(row)
{
       double t;
       register i;

       t = 0;
       for(i=0; i<CPUSTATES; i++)
               t += s.time[i];
       if(t == 0.)
               t = 1.;
       return(s.time[row]*100./t);
}

pct(top, bot)
{

       if (bot == 0)
               return (0);
       return ((top * 100) / bot);
}

dointr(nintv)
{
       int nintr, inttotal;
       long *intrcnt;
       char *intrname, *malloc();

       nintr = (nl[X_EINTRCNT].n_value - nl[X_INTRCNT].n_value) / sizeof(long);
       intrcnt = (long *) malloc(nl[X_EINTRCNT].n_value -
               nl[X_INTRCNT].n_value);
       intrname = malloc(nl[X_EINTRNAMES].n_value - nl[X_INTRNAMES].n_value);
       if (intrcnt == NULL || intrname == NULL) {
               fprintf(stderr, "vmstat: out of memory\n");
               exit(9);
       }
       lseek(mf, (long)nl[X_INTRCNT].n_value, L_SET);
       read(mf, intrcnt, nintr * sizeof (long));
       lseek(mf, (long)nl[X_INTRNAMES].n_value, L_SET);
       read(mf, intrname, nl[X_EINTRNAMES].n_value - nl[X_INTRNAMES].n_value);
       printf("interrupt      total      rate\n");
       inttotal = 0;
       while (nintr--) {
               if (*intrcnt)
                       printf("%-12s %8ld %8ld\n", intrname,
                           *intrcnt, *intrcnt / nintv);
               intrname += strlen(intrname) + 1;
               inttotal += *intrcnt++;
       }
       printf("Total        %8ld %8ld\n", inttotal, inttotal / nintv);
}

/*
* These names must be kept in sync with
* the types defined in <sys/malloc.h>.
*/
char *kmemnames[] = {
       "free",         /* M_FREE */
       "mbuf",         /* M_MBUF */
       "devbuf",       /* M_DEVBUF */
       "socket",       /* M_SOCKET */
       "pcb",          /* M_PCB */
       "routetbl",     /* M_RTABLE */
       "hosttbl",      /* M_HTABLE */
       "fragtbl",      /* M_FTABLE */
       "zombie",       /* M_ZOMBIE */
       "ifaddr",       /* M_IFADDR */
       "soopts",       /* M_SOOPTS */
       "soname",       /* M_SONAME */
       "namei",        /* M_NAMEI */
       "gprof",        /* M_GPROF */
       "ioctlops",     /* M_IOCTLOPS */
       "superblk",     /* M_SUPERBLK */
       "cred",         /* M_CRED */
       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
       "temp",         /* M_TEMP */
};

domem()
{
       struct kmemstats kmemstats[M_LAST];
       struct kmembuckets buckets[MINBUCKET + 16];
       register struct kmembuckets *kp;
       register struct kmemstats *ks;
       int i;

       lseek(mf, (long)nl[X_KMEMBUCKETS].n_value, L_SET);
       read(mf, buckets, sizeof buckets);
       printf("Memory statistics by bucket size\n");
       printf("    Size   In Use   Free   Requests  HighWater  Couldfree\n");
       for (i = MINBUCKET, kp = &buckets[i]; i < MINBUCKET + 16; i++, kp++) {
               if (kp->kb_calls == 0)
                       continue;
               printf("%8d%9d%7d%11d%8d%11d\n", 1 << i, 
                       kp->kb_total - kp->kb_totalfree,
                       kp->kb_totalfree, kp->kb_calls,
                       kp->kb_highwat, kp->kb_couldfree);
               
       }
       lseek(mf, (long)nl[X_KMEMSTAT].n_value, L_SET);
       read(mf, kmemstats, sizeof kmemstats);
       printf("Memory statistics by type\n");
       printf("     Type   In Use  MemUse   HighUse  Limit  Requests %s\n",
               "TypeLimit KernLimit");
       for (i = 0, ks = &kmemstats[0]; i < M_LAST; i++, ks++) {
               if (ks->ks_calls == 0)
                       continue;
               printf("%10s%7d%8dK%9dK%6dK%9d%7d%10d\n",
                       kmemnames[i] ? kmemnames[i] : "undefined",
                       ks->ks_inuse, (ks->ks_memuse + 1023) / 1024,
                       (ks->ks_maxused + 1023) / 1024,
                       (ks->ks_limit + 1023) / 1024, ks->ks_calls,
                       ks->ks_limblocks, ks->ks_mapblocks);
       }
}

#define steal(where, var) \
       lseek(mf, where, L_SET); read(mf, &var, sizeof var);
/*
* Read the drive names out of kmem.
*/
#ifdef vax
#include <vaxuba/ubavar.h>
#include <vaxmba/mbavar.h>

read_names()
{
       struct mba_device mdev;
       register struct mba_device *mp;
       struct mba_driver mdrv;
       short two_char;
       char *cp = (char *) &two_char;
       struct uba_device udev, *up;
       struct uba_driver udrv;

       mp = (struct mba_device *) nl[X_MBDINIT].n_value;
       up = (struct uba_device *) nl[X_UBDINIT].n_value;
       if (up == 0) {
               fprintf(stderr, "vmstat: Disk init info not in namelist\n");
               exit(1);
       }
       if (mp) for (;;) {
               steal(mp++, mdev);
               if (mdev.mi_driver == 0)
                       break;
               if (mdev.mi_dk < 0 || mdev.mi_alive == 0)
                       continue;
               steal(mdev.mi_driver, mdrv);
               steal(mdrv.md_dname, two_char);
               sprintf(dr_name[mdev.mi_dk], "%c%c%d",
                   cp[0], cp[1], mdev.mi_unit);
       }
       for (;;) {
               steal(up++, udev);
               if (udev.ui_driver == 0)
                       break;
               if (udev.ui_dk < 0 || udev.ui_alive == 0)
                       continue;
               steal(udev.ui_driver, udrv);
               steal(udrv.ud_dname, two_char);
               sprintf(dr_name[udev.ui_dk], "%c%c%d",
                   cp[0], cp[1], udev.ui_unit);
       }
}
#endif

#ifdef tahoe
#include <tahoevba/vbavar.h>

/*
* Read the drive names out of kmem.
*/
read_names()
{
       struct vba_device udev, *up;
       struct vba_driver udrv;
       short two_char;
       char *cp = (char *)&two_char;

       up = (struct vba_device *) nl[X_VBDINIT].n_value;
       if (up == 0) {
               fprintf(stderr, "vmstat: Disk init info not in namelist\n");
               exit(1);
       }
       for (;;) {
               steal(up++, udev);
               if (udev.ui_driver == 0)
                       break;
               if (udev.ui_dk < 0 || udev.ui_alive == 0)
                       continue;
               steal(udev.ui_driver, udrv);
               steal(udrv.ud_dname, two_char);
               sprintf(dr_name[udev.ui_dk], "%c%c%d",
                    cp[0], cp[1], udev.ui_unit);
       }
}
#endif