usr.bin/vmstat/vmstat.c

   1 /*
   2  * Copyright (c) 1980, 1986, 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 static const char copyright[] =
  36 "@(#) Copyright (c) 1980, 1986, 1991, 1993\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #if 0
  41 #ifndef lint
  42 static char sccsid[] = "@(#)vmstat.c    8.1 (Berkeley) 6/6/93";
  43 #endif /* not lint */
  44 #endif
  45
  46 #include <sys/cdefs.h>
  47 __FBSDID("$FreeBSD$");
  48
  49 #include <sys/param.h>
  50 #include <sys/time.h>
  51 #include <sys/proc.h>
  52 #include <sys/uio.h>
  53 #include <sys/namei.h>
  54 #include <sys/malloc.h>
  55 #include <sys/signal.h>
  56 #include <sys/fcntl.h>
  57 #include <sys/ioctl.h>
  58 #include <sys/resource.h>
  59 #include <sys/sysctl.h>
  60 #include <sys/vmmeter.h>
  61
  62 #include <vm/vm_param.h>
  63
  64 #include <ctype.h>
  65 #include <devstat.h>
  66 #include <err.h>
  67 #include <errno.h>
  68 #include <kvm.h>
  69 #include <limits.h>
  70 #include <memstat.h>
  71 #include <nlist.h>
  72 #include <paths.h>
  73 #include <stdio.h>
  74 #include <stdlib.h>
  75 #include <string.h>
  76 #include <sysexits.h>
  77 #include <time.h>
  78 #include <unistd.h>
  79 #include <libutil.h>
  80
  81 static char da[] = "da";
  82
  83 static struct nlist namelist[] = {
  84 #define X_SUM           0
  85         { "_cnt" },
  86 #define X_BOOTTIME      1
  87         { "_boottime" },
  88 #define X_HZ            2
  89         { "_hz" },
  90 #define X_STATHZ        3
  91         { "_stathz" },
  92 #define X_NCHSTATS      4
  93         { "_nchstats" },
  94 #define X_INTRNAMES     5
  95         { "_intrnames" },
  96 #define X_EINTRNAMES    6
  97         { "_eintrnames" },
  98 #define X_INTRCNT       7
  99         { "_intrcnt" },
 100 #define X_EINTRCNT      8
 101         { "_eintrcnt" },
 102 #define X_KMEMSTATS     9
 103         { "_kmemstatistics" },
 104 #define X_KMEMZONES     10
 105         { "_kmemzones" },
 106 #ifdef notyet
 107 #define X_DEFICIT       XXX
 108         { "_deficit" },
 109 #define X_REC           XXX
 110         { "_rectime" },
 111 #define X_PGIN          XXX
 112         { "_pgintime" },
 113 #define X_XSTATS        XXX
 114         { "_xstats" },
 115 #define X_END           XXX
 116 #else
 117 #define X_END           11
 118 #endif
 119         { "" },
 120 };
 121
 122 static struct statinfo cur, last;
 123 static int num_devices, maxshowdevs;
 124 static long generation;
 125 static struct device_selection *dev_select;
 126 static int num_selected;
 127 static struct devstat_match *matches;
 128 static int num_matches = 0;
 129 static int num_devices_specified, num_selections;
 130 static long select_generation;
 131 static char **specified_devices;
 132 static devstat_select_mode select_mode;
 133
 134 static struct   vmmeter sum, osum;
 135
 136 #define VMSTAT_DEFAULT_LINES    20      /* Default number of `winlines'. */
 137 volatile sig_atomic_t wresized;         /* Tty resized, when non-zero. */
 138 static int winlines = VMSTAT_DEFAULT_LINES; /* Current number of tty rows. */
 139
 140 static int      aflag;
 141 static int      nflag;
 142 static int      Pflag;
 143 static int      hflag;
 144
 145 static kvm_t   *kd;
 146
 147 #define FORKSTAT        0x01
 148 #define INTRSTAT        0x02
 149 #define MEMSTAT         0x04
 150 #define SUMSTAT         0x08
 151 #define TIMESTAT        0x10
 152 #define VMSTAT          0x20
 153 #define ZMEMSTAT        0x40
 154
 155 static void     cpustats(void);
 156 static void     pcpustats(int, u_long, int);
 157 static void     devstats(void);
 158 static void     doforkst(void);
 159 static void     dointr(void);
 160 static void     dosum(void);
 161 static void     dovmstat(unsigned int, int);
 162 static void     domemstat_malloc(void);
 163 static void     domemstat_zone(void);
 164 static void     kread(int, void *, size_t);
 165 static void     kreado(int, void *, size_t, size_t);
 166 static char    *kgetstr(const char *);
 167 static void     needhdr(int);
 168 static void     needresize(int);
 169 static void     doresize(void);
 170 static void     printhdr(int, u_long);
 171 static void     usage(void);
 172
 173 static long     pct(long, long);
 174 static long     getuptime(void);
 175
 176 static char   **getdrivedata(char **);
 177
 178 int
 179 main(int argc, char *argv[])
 180 {
 181         int c, todo;
 182         unsigned int interval;
 183         int reps;
 184         char *memf, *nlistf;
 185         char errbuf[_POSIX2_LINE_MAX];
 186
 187         memf = nlistf = NULL;
 188         interval = reps = todo = 0;
 189         maxshowdevs = 2;
 190         hflag = isatty(1);
 191         while ((c = getopt(argc, argv, "ac:fhHiM:mN:n:Pp:stw:z")) != -1) {
 192                 switch (c) {
 193                 case 'a':
 194                         aflag++;
 195                         break;
 196                 case 'c':
 197                         reps = atoi(optarg);
 198                         break;
 199                 case 'P':
 200                         Pflag++;
 201                         break;
 202                 case 'f':
 203                         todo |= FORKSTAT;
 204                         break;
 205                 case 'h':
 206                         hflag = 1;
 207                         break;
 208                 case 'H':
 209                         hflag = 0;
 210                         break;
 211                 case 'i':
 212                         todo |= INTRSTAT;
 213                         break;
 214                 case 'M':
 215                         memf = optarg;
 216                         break;
 217                 case 'm':
 218                         todo |= MEMSTAT;
 219                         break;
 220                 case 'N':
 221                         nlistf = optarg;
 222                         break;
 223                 case 'n':
 224                         nflag = 1;
 225                         maxshowdevs = atoi(optarg);
 226                         if (maxshowdevs < 0)
 227                                 errx(1, "number of devices %d is < 0",
 228                                      maxshowdevs);
 229                         break;
 230                 case 'p':
 231                         if (devstat_buildmatch(optarg, &matches, &num_matches) != 0)
 232                                 errx(1, "%s", devstat_errbuf);
 233                         break;
 234                 case 's':
 235                         todo |= SUMSTAT;
 236                         break;
 237                 case 't':
 238 #ifdef notyet
 239                         todo |= TIMESTAT;
 240 #else
 241                         errx(EX_USAGE, "sorry, -t is not (re)implemented yet");
 242 #endif
 243                         break;
 244                 case 'w':
 245                         interval = atoi(optarg);
 246                         break;
 247                 case 'z':
 248                         todo |= ZMEMSTAT;
 249                         break;
 250                 case '?':
 251                 default:
 252                         usage();
 253                 }
 254         }
 255         argc -= optind;
 256         argv += optind;
 257
 258         if (todo == 0)
 259                 todo = VMSTAT;
 260
 261         if (memf != NULL) {
 262                 kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
 263                 if (kd == NULL)
 264                         errx(1, "kvm_openfiles: %s", errbuf);
 265         }
 266
 267         if (kd != NULL && (c = kvm_nlist(kd, namelist)) != 0) {
 268                 if (c > 0) {
 269                         warnx("undefined symbols:");
 270                         for (c = 0;
 271                              c < (int)(sizeof(namelist)/sizeof(namelist[0]));
 272                              c++)
 273                                 if (namelist[c].n_type == 0)
 274                                         (void)fprintf(stderr, " %s",
 275                                             namelist[c].n_name);
 276                         (void)fputc('\n', stderr);
 277                 } else
 278                         warnx("kvm_nlist: %s", kvm_geterr(kd));
 279                 exit(1);
 280         }
 281         if (kd && Pflag)
 282                 errx(1, "Cannot use -P with crash dumps");
 283
 284         if (todo & VMSTAT) {
 285                 /*
 286                  * Make sure that the userland devstat version matches the
 287                  * kernel devstat version.  If not, exit and print a
 288                  * message informing the user of his mistake.
 289                  */
 290                 if (devstat_checkversion(NULL) < 0)
 291                         errx(1, "%s", devstat_errbuf);
 292
 293
 294                 argv = getdrivedata(argv);
 295         }
 296
 297 #define BACKWARD_COMPATIBILITY
 298 #ifdef  BACKWARD_COMPATIBILITY
 299         if (*argv) {
 300                 interval = atoi(*argv);
 301                 if (*++argv)
 302                         reps = atoi(*argv);
 303         }
 304 #endif
 305
 306         if (interval) {
 307                 if (!reps)
 308                         reps = -1;
 309         } else if (reps)
 310                 interval = 1;
 311
 312         if (todo & FORKSTAT)
 313                 doforkst();
 314         if (todo & MEMSTAT)
 315                 domemstat_malloc();
 316         if (todo & ZMEMSTAT)
 317                 domemstat_zone();
 318         if (todo & SUMSTAT)
 319                 dosum();
 320 #ifdef notyet
 321         if (todo & TIMESTAT)
 322                 dotimes();
 323 #endif
 324         if (todo & INTRSTAT)
 325                 dointr();
 326         if (todo & VMSTAT)
 327                 dovmstat(interval, reps);
 328         exit(0);
 329 }
 330
 331 static int
 332 mysysctl(const char *name, void *oldp, size_t *oldlenp,
 333     void *newp, size_t newlen)
 334 {
 335         int error;
 336
 337         error = sysctlbyname(name, oldp, oldlenp, newp, newlen);
 338         if (error != 0 && errno != ENOMEM)
 339                 err(1, "sysctl(%s)", name);
 340         return (error);
 341 }
 342
 343 static char **
 344 getdrivedata(char **argv)
 345 {
 346         if ((num_devices = devstat_getnumdevs(NULL)) < 0)
 347                 errx(1, "%s", devstat_errbuf);
 348
 349         cur.dinfo = (struct devinfo *)calloc(1, sizeof(struct devinfo));
 350         last.dinfo = (struct devinfo *)calloc(1, sizeof(struct devinfo));
 351
 352         if (devstat_getdevs(NULL, &cur) == -1)
 353                 errx(1, "%s", devstat_errbuf);
 354
 355         num_devices = cur.dinfo->numdevs;
 356         generation = cur.dinfo->generation;
 357
 358         specified_devices = (char **)malloc(sizeof(char *));
 359         for (num_devices_specified = 0; *argv; ++argv) {
 360                 if (isdigit(**argv))
 361                         break;
 362                 num_devices_specified++;
 363                 specified_devices = (char **)realloc(specified_devices,
 364                                                      sizeof(char *) *
 365                                                      num_devices_specified);
 366                 specified_devices[num_devices_specified - 1] = *argv;
 367         }
 368         dev_select = NULL;
 369
 370         if (nflag == 0 && maxshowdevs < num_devices_specified)
 371                         maxshowdevs = num_devices_specified;
 372
 373         /*
 374          * People are generally only interested in disk statistics when
 375          * they're running vmstat.  So, that's what we're going to give
 376          * them if they don't specify anything by default.  We'll also give
 377          * them any other random devices in the system so that we get to
 378          * maxshowdevs devices, if that many devices exist.  If the user
 379          * specifies devices on the command line, either through a pattern
 380          * match or by naming them explicitly, we will give the user only
 381          * those devices.
 382          */
 383         if ((num_devices_specified == 0) && (num_matches == 0)) {
 384                 if (devstat_buildmatch(da, &matches, &num_matches) != 0)
 385                         errx(1, "%s", devstat_errbuf);
 386
 387                 select_mode = DS_SELECT_ADD;
 388         } else
 389                 select_mode = DS_SELECT_ONLY;
 390
 391         /*
 392          * At this point, selectdevs will almost surely indicate that the
 393          * device list has changed, so we don't look for return values of 0
 394          * or 1.  If we get back -1, though, there is an error.
 395          */
 396         if (devstat_selectdevs(&dev_select, &num_selected, &num_selections,
 397                        &select_generation, generation, cur.dinfo->devices,
 398                        num_devices, matches, num_matches, specified_devices,
 399                        num_devices_specified, select_mode,
 400                        maxshowdevs, 0) == -1)
 401                 errx(1, "%s", devstat_errbuf);
 402
 403         return(argv);
 404 }
 405
 406 static long
 407 getuptime(void)
 408 {
 409         struct timespec sp;
 410         time_t uptime;
 411
 412         (void)clock_gettime(CLOCK_MONOTONIC, &sp);
 413         uptime = sp.tv_sec;
 414         if (uptime <= 0 || uptime > 60*60*24*365*10)
 415                 errx(1, "time makes no sense; namelist must be wrong");
 416
 417         return(uptime);
 418 }
 419
 420 static void
 421 fill_vmmeter(struct vmmeter *vmmp)
 422 {
 423         if (kd != NULL) {
 424                 kread(X_SUM, vmmp, sizeof(*vmmp));
 425         } else {
 426                 size_t size = sizeof(unsigned int);
 427 #define GET_VM_STATS(cat, name) \
 428         mysysctl("vm.stats." #cat "." #name, &vmmp->name, &size, NULL, 0)
 429                 /* sys */
 430                 GET_VM_STATS(sys, v_swtch);
 431                 GET_VM_STATS(sys, v_trap);
 432                 GET_VM_STATS(sys, v_syscall);
 433                 GET_VM_STATS(sys, v_intr);
 434                 GET_VM_STATS(sys, v_soft);
 435
 436                 /* vm */
 437                 GET_VM_STATS(vm, v_vm_faults);
 438                 GET_VM_STATS(vm, v_cow_faults);
 439                 GET_VM_STATS(vm, v_cow_optim);
 440                 GET_VM_STATS(vm, v_zfod);
 441                 GET_VM_STATS(vm, v_ozfod);
 442                 GET_VM_STATS(vm, v_swapin);
 443                 GET_VM_STATS(vm, v_swapout);
 444                 GET_VM_STATS(vm, v_swappgsin);
 445                 GET_VM_STATS(vm, v_swappgsout);
 446                 GET_VM_STATS(vm, v_vnodein);
 447                 GET_VM_STATS(vm, v_vnodeout);
 448                 GET_VM_STATS(vm, v_vnodepgsin);
 449                 GET_VM_STATS(vm, v_vnodepgsout);
 450                 GET_VM_STATS(vm, v_intrans);
 451                 GET_VM_STATS(vm, v_reactivated);
 452                 GET_VM_STATS(vm, v_pdwakeups);
 453                 GET_VM_STATS(vm, v_pdpages);
 454                 GET_VM_STATS(vm, v_tcached);
 455                 GET_VM_STATS(vm, v_dfree);
 456                 GET_VM_STATS(vm, v_pfree);
 457                 GET_VM_STATS(vm, v_tfree);
 458                 GET_VM_STATS(vm, v_page_size);
 459                 GET_VM_STATS(vm, v_page_count);
 460                 GET_VM_STATS(vm, v_free_reserved);
 461                 GET_VM_STATS(vm, v_free_target);
 462                 GET_VM_STATS(vm, v_free_min);
 463                 GET_VM_STATS(vm, v_free_count);
 464                 GET_VM_STATS(vm, v_wire_count);
 465                 GET_VM_STATS(vm, v_active_count);
 466                 GET_VM_STATS(vm, v_inactive_target);
 467                 GET_VM_STATS(vm, v_inactive_count);
 468                 GET_VM_STATS(vm, v_cache_count);
 469                 GET_VM_STATS(vm, v_cache_min);
 470                 GET_VM_STATS(vm, v_cache_max);
 471                 GET_VM_STATS(vm, v_pageout_free_min);
 472                 GET_VM_STATS(vm, v_interrupt_free_min);
 473                 /*GET_VM_STATS(vm, v_free_severe);*/
 474                 GET_VM_STATS(vm, v_forks);
 475                 GET_VM_STATS(vm, v_vforks);
 476                 GET_VM_STATS(vm, v_rforks);
 477                 GET_VM_STATS(vm, v_kthreads);
 478                 GET_VM_STATS(vm, v_forkpages);
 479                 GET_VM_STATS(vm, v_vforkpages);
 480                 GET_VM_STATS(vm, v_rforkpages);
 481                 GET_VM_STATS(vm, v_kthreadpages);
 482 #undef GET_VM_STATS
 483         }
 484 }
 485
 486 static void
 487 fill_vmtotal(struct vmtotal *vmtp)
 488 {
 489         if (kd != NULL) {
 490                 /* XXX fill vmtp */
 491                 errx(1, "not implemented");
 492         } else {
 493                 size_t size = sizeof(*vmtp);
 494                 mysysctl("vm.vmtotal", vmtp, &size, NULL, 0);
 495                 if (size != sizeof(*vmtp))
 496                         errx(1, "vm.total size mismatch");
 497         }
 498 }
 499
 500 /* Determine how many cpu columns, and what index they are in kern.cp_times */
 501 static int
 502 getcpuinfo(u_long *maskp, int *maxidp)
 503 {
 504         int maxcpu;
 505         int maxid;
 506         int ncpus;
 507         int i, j;
 508         int empty;
 509         size_t size;
 510         long *times;
 511         u_long mask;
 512
 513         if (kd != NULL)
 514                 errx(1, "not implemented");
 515         mask = 0;
 516         ncpus = 0;
 517         size = sizeof(maxcpu);
 518         mysysctl("kern.smp.maxcpus", &maxcpu, &size, NULL, 0);
 519         if (size != sizeof(maxcpu))
 520                 errx(1, "sysctl kern.smp.maxcpus");
 521         size = sizeof(long) * maxcpu * CPUSTATES;
 522         times = malloc(size);
 523         if (times == NULL)
 524                 err(1, "malloc %zd bytes", size);
 525         mysysctl("kern.cp_times", times, &size, NULL, 0);
 526         maxid = (size / CPUSTATES / sizeof(long)) - 1;
 527         for (i = 0; i <= maxid; i++) {
 528                 empty = 1;
 529                 for (j = 0; empty && j < CPUSTATES; j++) {
 530                         if (times[i * CPUSTATES + j] != 0)
 531                                 empty = 0;
 532                 }
 533                 if (!empty) {
 534                         mask |= (1ul << i);
 535                         ncpus++;
 536                 }
 537         }
 538         if (maskp)
 539                 *maskp = mask;
 540         if (maxidp)
 541                 *maxidp = maxid;
 542         return (ncpus);
 543 }
 544
 545
 546 static void
 547 prthuman(u_int64_t val, int size)
 548 {
 549         char buf[10];
 550         int flags;
 551
 552         if (size < 5 || size > 9)
 553                 errx(1, "doofus");
 554         flags = HN_B | HN_NOSPACE | HN_DECIMAL;
 555         humanize_number(buf, size, val, "", HN_AUTOSCALE, flags);
 556         printf("%*s", size, buf);
 557 }
 558
 559 static int hz, hdrcnt;
 560
 561 static long *cur_cp_times;
 562 static long *last_cp_times;
 563 static size_t size_cp_times;
 564
 565 static void
 566 dovmstat(unsigned int interval, int reps)
 567 {
 568         struct vmtotal total;
 569         time_t uptime, halfuptime;
 570         struct devinfo *tmp_dinfo;
 571         size_t size;
 572         int ncpus, maxid;
 573         u_long cpumask;
 574
 575         uptime = getuptime();
 576         halfuptime = uptime / 2;
 577
 578         /*
 579          * If the user stops the program (control-Z) and then resumes it,
 580          * print out the header again.
 581          */
 582         (void)signal(SIGCONT, needhdr);
 583
 584         /*
 585          * If our standard output is a tty, then install a SIGWINCH handler
 586          * and set wresized so that our first iteration through the main
 587          * vmstat loop will peek at the terminal's current rows to find out
 588          * how many lines can fit in a screenful of output.
 589          */
 590         if (isatty(fileno(stdout)) != 0) {
 591                 wresized = 1;
 592                 (void)signal(SIGWINCH, needresize);
 593         } else {
 594                 wresized = 0;
 595                 winlines = VMSTAT_DEFAULT_LINES;
 596         }
 597
 598         if (kd != NULL) {
 599                 if (namelist[X_STATHZ].n_type != 0 &&
 600                     namelist[X_STATHZ].n_value != 0)
 601                         kread(X_STATHZ, &hz, sizeof(hz));
 602                 if (!hz)
 603                         kread(X_HZ, &hz, sizeof(hz));
 604         } else {
 605                 struct clockinfo clockrate;
 606
 607                 size = sizeof(clockrate);
 608                 mysysctl("kern.clockrate", &clockrate, &size, NULL, 0);
 609                 if (size != sizeof(clockrate))
 610                         errx(1, "clockrate size mismatch");
 611                 hz = clockrate.hz;
 612         }
 613
 614         if (Pflag) {
 615                 ncpus = getcpuinfo(&cpumask, &maxid);
 616                 size_cp_times = sizeof(long) * (maxid + 1) * CPUSTATES;
 617                 cur_cp_times = calloc(1, size_cp_times);
 618                 last_cp_times = calloc(1, size_cp_times);
 619         }
 620         for (hdrcnt = 1;;) {
 621                 if (!--hdrcnt)
 622                         printhdr(ncpus, cpumask);
 623                 if (kd != NULL) {
 624                         if (kvm_getcptime(kd, cur.cp_time) < 0)
 625                                 errx(1, "kvm_getcptime: %s", kvm_geterr(kd));
 626                 } else {
 627                         size = sizeof(cur.cp_time);
 628                         mysysctl("kern.cp_time", &cur.cp_time, &size, NULL, 0);
 629                         if (size != sizeof(cur.cp_time))
 630                                 errx(1, "cp_time size mismatch");
 631                 }
 632                 if (Pflag) {
 633                         size = size_cp_times;
 634                         mysysctl("kern.cp_times", cur_cp_times, &size, NULL, 0);
 635                         if (size != size_cp_times)
 636                                 errx(1, "cp_times mismatch");
 637                 }
 638
 639                 tmp_dinfo = last.dinfo;
 640                 last.dinfo = cur.dinfo;
 641                 cur.dinfo = tmp_dinfo;
 642                 last.snap_time = cur.snap_time;
 643
 644                 /*
 645                  * Here what we want to do is refresh our device stats.
 646                  * getdevs() returns 1 when the device list has changed.
 647                  * If the device list has changed, we want to go through
 648                  * the selection process again, in case a device that we
 649                  * were previously displaying has gone away.
 650                  */
 651                 switch (devstat_getdevs(NULL, &cur)) {
 652                 case -1:
 653                         errx(1, "%s", devstat_errbuf);
 654                         break;
 655                 case 1: {
 656                         int retval;
 657
 658                         num_devices = cur.dinfo->numdevs;
 659                         generation = cur.dinfo->generation;
 660
 661                         retval = devstat_selectdevs(&dev_select, &num_selected,
 662                                             &num_selections, &select_generation,
 663                                             generation, cur.dinfo->devices,
 664                                             num_devices, matches, num_matches,
 665                                             specified_devices,
 666                                             num_devices_specified, select_mode,
 667                                             maxshowdevs, 0);
 668                         switch (retval) {
 669                         case -1:
 670                                 errx(1, "%s", devstat_errbuf);
 671                                 break;
 672                         case 1:
 673                                 printhdr(ncpus, cpumask);
 674                                 break;
 675                         default:
 676                                 break;
 677                         }
 678                 }
 679                 default:
 680                         break;
 681                 }
 682
 683                 fill_vmmeter(&sum);
 684                 fill_vmtotal(&total);
 685                 (void)printf("%2d %1d %1d",
 686                     total.t_rq - 1, total.t_dw + total.t_pw, total.t_sw);
 687 #define vmstat_pgtok(a) ((a) * (sum.v_page_size >> 10))
 688 #define rate(x) (((x) + halfuptime) / uptime)   /* round */
 689                 if (hflag) {
 690                         printf(" ");
 691                         prthuman(total.t_avm * (u_int64_t)sum.v_page_size, 7);
 692                         printf(" ");
 693                         prthuman(total.t_free * (u_int64_t)sum.v_page_size, 6);
 694                         printf(" ");
 695                 } else {
 696                         printf(" %7d ", vmstat_pgtok(total.t_avm));
 697                         printf(" %6d ", vmstat_pgtok(total.t_free));
 698                 }
 699                 (void)printf("%5lu ",
 700                     (unsigned long)rate(sum.v_vm_faults - osum.v_vm_faults));
 701                 (void)printf("%3lu ",
 702                     (unsigned long)rate(sum.v_reactivated - osum.v_reactivated));
 703                 (void)printf("%3lu ",
 704                     (unsigned long)rate(sum.v_swapin + sum.v_vnodein -
 705                     (osum.v_swapin + osum.v_vnodein)));
 706                 (void)printf("%3lu ",
 707                     (unsigned long)rate(sum.v_swapout + sum.v_vnodeout -
 708                     (osum.v_swapout + osum.v_vnodeout)));
 709                 (void)printf("%5lu ",
 710                     (unsigned long)rate(sum.v_tfree - osum.v_tfree));
 711                 (void)printf("%3lu ",
 712                     (unsigned long)rate(sum.v_pdpages - osum.v_pdpages));
 713                 devstats();
 714                 (void)printf("%4lu %4lu %4lu",
 715                     (unsigned long)rate(sum.v_intr - osum.v_intr),
 716                     (unsigned long)rate(sum.v_syscall - osum.v_syscall),
 717                     (unsigned long)rate(sum.v_swtch - osum.v_swtch));
 718                 if (Pflag)
 719                         pcpustats(ncpus, cpumask, maxid);
 720                 else
 721                         cpustats();
 722                 (void)printf("\n");
 723                 (void)fflush(stdout);
 724                 if (reps >= 0 && --reps <= 0)
 725                         break;
 726                 osum = sum;
 727                 uptime = interval;
 728                 /*
 729                  * We round upward to avoid losing low-frequency events
 730                  * (i.e., >= 1 per interval but < 1 per second).
 731                  */
 732                 if (interval != 1)
 733                         halfuptime = (uptime + 1) / 2;
 734                 else
 735                         halfuptime = 0;
 736                 (void)sleep(interval);
 737         }
 738 }
 739
 740 static void
 741 printhdr(int ncpus, u_long cpumask)
 742 {
 743         int i, num_shown;
 744
 745         num_shown = (num_selected < maxshowdevs) ? num_selected : maxshowdevs;
 746         (void)printf(" procs      memory      page%*s", 19, "");
 747         if (num_shown > 1)
 748                 (void)printf(" disks %*s", num_shown * 4 - 7, "");
 749         else if (num_shown == 1)
 750                 (void)printf("disk");
 751         (void)printf("   faults         ");
 752         if (Pflag) {
 753                 for (i = 0; i < ncpus; i++) {
 754                         if (cpumask & (1ul << i))
 755                                 printf("cpu%-2d    ", i);
 756                 }
 757                 printf("\n");
 758         } else
 759                 printf("cpu\n");
 760         (void)printf(" r b w     avm    fre   flt  re  pi  po    fr  sr ");
 761         for (i = 0; i < num_devices; i++)
 762                 if ((dev_select[i].selected)
 763                  && (dev_select[i].selected <= maxshowdevs))
 764                         (void)printf("%c%c%d ", dev_select[i].device_name[0],
 765                                      dev_select[i].device_name[1],
 766                                      dev_select[i].unit_number);
 767         (void)printf("  in   sy   cs");
 768         if (Pflag) {
 769                 for (i = 0; i < ncpus; i++)
 770                         printf(" us sy id");
 771                 printf("\n");
 772         } else
 773                 printf(" us sy id\n");
 774         if (wresized != 0)
 775                 doresize();
 776         hdrcnt = winlines;
 777 }
 778
 779 /*
 780  * Force a header to be prepended to the next output.
 781  */
 782 static void
 783 needhdr(int dummy __unused)
 784 {
 785
 786         hdrcnt = 1;
 787 }
 788
 789 /*
 790  * When the terminal is resized, force an update of the maximum number of rows
 791  * printed between each header repetition.  Then force a new header to be
 792  * prepended to the next output.
 793  */
 794 void
 795 needresize(int signo)
 796 {
 797
 798         wresized = 1;
 799         hdrcnt = 1;
 800 }
 801
 802 /*
 803  * Update the global `winlines' count of terminal rows.
 804  */
 805 void
 806 doresize(void)
 807 {
 808         int status;
 809         struct winsize w;
 810
 811         for (;;) {
 812                 status = ioctl(fileno(stdout), TIOCGWINSZ, &w);
 813                 if (status == -1 && errno == EINTR)
 814                         continue;
 815                 else if (status == -1)
 816                         err(1, "ioctl");
 817                 if (w.ws_row > 3)
 818                         winlines = w.ws_row - 3;
 819                 else
 820                         winlines = VMSTAT_DEFAULT_LINES;
 821                 break;
 822         }
 823
 824         /*
 825          * Inhibit doresize() calls until we are rescheduled by SIGWINCH.
 826          */
 827         wresized = 0;
 828 }
 829
 830 #ifdef notyet
 831 static void
 832 dotimes(void)
 833 {
 834         unsigned int pgintime, rectime;
 835
 836         kread(X_REC, &rectime, sizeof(rectime));
 837         kread(X_PGIN, &pgintime, sizeof(pgintime));
 838         kread(X_SUM, &sum, sizeof(sum));
 839         (void)printf("%u reclaims, %u total time (usec)\n",
 840             sum.v_pgrec, rectime);
 841         (void)printf("average: %u usec / reclaim\n", rectime / sum.v_pgrec);
 842         (void)printf("\n");
 843         (void)printf("%u page ins, %u total time (msec)\n",
 844             sum.v_pgin, pgintime / 10);
 845         (void)printf("average: %8.1f msec / page in\n",
 846             pgintime / (sum.v_pgin * 10.0));
 847 }
 848 #endif
 849
 850 static long
 851 pct(long top, long bot)
 852 {
 853         long ans;
 854
 855         if (bot == 0)
 856                 return(0);
 857         ans = (quad_t)top * 100 / bot;
 858         return (ans);
 859 }
 860
 861 #define PCT(top, bot) pct((long)(top), (long)(bot))
 862
 863 static void
 864 dosum(void)
 865 {
 866         struct nchstats lnchstats;
 867         long nchtotal;
 868
 869         fill_vmmeter(&sum);
 870         (void)printf("%9u cpu context switches\n", sum.v_swtch);
 871         (void)printf("%9u device interrupts\n", sum.v_intr);
 872         (void)printf("%9u software interrupts\n", sum.v_soft);
 873         (void)printf("%9u traps\n", sum.v_trap);
 874         (void)printf("%9u system calls\n", sum.v_syscall);
 875         (void)printf("%9u kernel threads created\n", sum.v_kthreads);
 876         (void)printf("%9u  fork() calls\n", sum.v_forks);
 877         (void)printf("%9u vfork() calls\n", sum.v_vforks);
 878         (void)printf("%9u rfork() calls\n", sum.v_rforks);
 879         (void)printf("%9u swap pager pageins\n", sum.v_swapin);
 880         (void)printf("%9u swap pager pages paged in\n", sum.v_swappgsin);
 881         (void)printf("%9u swap pager pageouts\n", sum.v_swapout);
 882         (void)printf("%9u swap pager pages paged out\n", sum.v_swappgsout);
 883         (void)printf("%9u vnode pager pageins\n", sum.v_vnodein);
 884         (void)printf("%9u vnode pager pages paged in\n", sum.v_vnodepgsin);
 885         (void)printf("%9u vnode pager pageouts\n", sum.v_vnodeout);
 886         (void)printf("%9u vnode pager pages paged out\n", sum.v_vnodepgsout);
 887         (void)printf("%9u page daemon wakeups\n", sum.v_pdwakeups);
 888         (void)printf("%9u pages examined by the page daemon\n", sum.v_pdpages);
 889         (void)printf("%9u pages reactivated\n", sum.v_reactivated);
 890         (void)printf("%9u copy-on-write faults\n", sum.v_cow_faults);
 891         (void)printf("%9u copy-on-write optimized faults\n", sum.v_cow_optim);
 892         (void)printf("%9u zero fill pages zeroed\n", sum.v_zfod);
 893         (void)printf("%9u zero fill pages prezeroed\n", sum.v_ozfod);
 894         (void)printf("%9u intransit blocking page faults\n", sum.v_intrans);
 895         (void)printf("%9u total VM faults taken\n", sum.v_vm_faults);
 896         (void)printf("%9u pages affected by kernel thread creation\n", sum.v_kthreadpages);
 897         (void)printf("%9u pages affected by  fork()\n", sum.v_forkpages);
 898         (void)printf("%9u pages affected by vfork()\n", sum.v_vforkpages);
 899         (void)printf("%9u pages affected by rfork()\n", sum.v_rforkpages);
 900         (void)printf("%9u pages cached\n", sum.v_tcached);
 901         (void)printf("%9u pages freed\n", sum.v_tfree);
 902         (void)printf("%9u pages freed by daemon\n", sum.v_dfree);
 903         (void)printf("%9u pages freed by exiting processes\n", sum.v_pfree);
 904         (void)printf("%9u pages active\n", sum.v_active_count);
 905         (void)printf("%9u pages inactive\n", sum.v_inactive_count);
 906         (void)printf("%9u pages in VM cache\n", sum.v_cache_count);
 907         (void)printf("%9u pages wired down\n", sum.v_wire_count);
 908         (void)printf("%9u pages free\n", sum.v_free_count);
 909         (void)printf("%9u bytes per page\n", sum.v_page_size);
 910         if (kd != NULL) {
 911                 kread(X_NCHSTATS, &lnchstats, sizeof(lnchstats));
 912         } else {
 913                 size_t size = sizeof(lnchstats);
 914                 mysysctl("vfs.cache.nchstats", &lnchstats, &size, NULL, 0);
 915                 if (size != sizeof(lnchstats))
 916                         errx(1, "vfs.cache.nchstats size mismatch");
 917         }
 918         nchtotal = lnchstats.ncs_goodhits + lnchstats.ncs_neghits +
 919             lnchstats.ncs_badhits + lnchstats.ncs_falsehits +
 920             lnchstats.ncs_miss + lnchstats.ncs_long;
 921         (void)printf("%9ld total name lookups\n", nchtotal);
 922         (void)printf(
 923             "%9s cache hits (%ld%% pos + %ld%% neg) system %ld%% per-directory\n",
 924             "", PCT(lnchstats.ncs_goodhits, nchtotal),
 925             PCT(lnchstats.ncs_neghits, nchtotal),
 926             PCT(lnchstats.ncs_pass2, nchtotal));
 927         (void)printf("%9s deletions %ld%%, falsehits %ld%%, toolong %ld%%\n", "",
 928             PCT(lnchstats.ncs_badhits, nchtotal),
 929             PCT(lnchstats.ncs_falsehits, nchtotal),
 930             PCT(lnchstats.ncs_long, nchtotal));
 931 }
 932
 933 static void
 934 doforkst(void)
 935 {
 936         fill_vmmeter(&sum);
 937         (void)printf("%u forks, %u pages, average %.2f\n",
 938             sum.v_forks, sum.v_forkpages,
 939             sum.v_forks == 0 ? 0.0 :
 940             (double)sum.v_forkpages / sum.v_forks);
 941         (void)printf("%u vforks, %u pages, average %.2f\n",
 942             sum.v_vforks, sum.v_vforkpages,
 943             sum.v_vforks == 0 ? 0.0 :
 944             (double)sum.v_vforkpages / sum.v_vforks);
 945         (void)printf("%u rforks, %u pages, average %.2f\n",
 946             sum.v_rforks, sum.v_rforkpages,
 947             sum.v_rforks == 0 ? 0.0 :
 948             (double)sum.v_rforkpages / sum.v_rforks);
 949 }
 950
 951 static void
 952 devstats(void)
 953 {
 954         int dn, state;
 955         long double transfers_per_second;
 956         long double busy_seconds;
 957         long tmp;
 958
 959         for (state = 0; state < CPUSTATES; ++state) {
 960                 tmp = cur.cp_time[state];
 961                 cur.cp_time[state] -= last.cp_time[state];
 962                 last.cp_time[state] = tmp;
 963         }
 964
 965         busy_seconds = cur.snap_time - last.snap_time;
 966
 967         for (dn = 0; dn < num_devices; dn++) {
 968                 int di;
 969
 970                 if ((dev_select[dn].selected == 0)
 971                  || (dev_select[dn].selected > maxshowdevs))
 972                         continue;
 973
 974                 di = dev_select[dn].position;
 975
 976                 if (devstat_compute_statistics(&cur.dinfo->devices[di],
 977                     &last.dinfo->devices[di], busy_seconds,
 978                     DSM_TRANSFERS_PER_SECOND, &transfers_per_second,
 979                     DSM_NONE) != 0)
 980                         errx(1, "%s", devstat_errbuf);
 981
 982                 (void)printf("%3.0Lf ", transfers_per_second);
 983         }
 984 }
 985
 986 static void
 987 percent(double pct, int *over)
 988 {
 989         char buf[10];
 990         int l;
 991
 992         l = snprintf(buf, sizeof(buf), "%.0f", pct);
 993         if (l == 1 && *over) {
 994                 printf("%s",  buf);
 995                 (*over)--;
 996         } else
 997                 printf("%2s", buf);
 998         if (l > 2)
 999                 (*over)++;
1000 }
1001
1002 static void
1003 cpustats(void)
1004 {
1005         int state, over;
1006         double lpct, total;
1007
1008         total = 0;
1009         for (state = 0; state < CPUSTATES; ++state)
1010                 total += cur.cp_time[state];
1011         if (total)
1012                 lpct = 100.0 / total;
1013         else
1014                 lpct = 0.0;
1015         over = 0;
1016         printf(" ");
1017         percent((cur.cp_time[CP_USER] + cur.cp_time[CP_NICE]) * lpct, &over);
1018         printf(" ");
1019         percent((cur.cp_time[CP_SYS] + cur.cp_time[CP_INTR]) * lpct, &over);
1020         printf(" ");
1021         percent(cur.cp_time[CP_IDLE] * lpct, &over);
1022 }
1023
1024 static void
1025 pcpustats(int ncpus, u_long cpumask, int maxid)
1026 {
1027         int state, i;
1028         double lpct, total;
1029         long tmp;
1030         int over;
1031
1032         /* devstats does this for cp_time */
1033         for (i = 0; i <= maxid; i++) {
1034                 if ((cpumask & (1ul << i)) == 0)
1035                         continue;
1036                 for (state = 0; state < CPUSTATES; ++state) {
1037                         tmp = cur_cp_times[i * CPUSTATES + state];
1038                         cur_cp_times[i * CPUSTATES + state] -= last_cp_times[i * CPUSTATES + state];
1039                         last_cp_times[i * CPUSTATES + state] = tmp;
1040                 }
1041         }
1042
1043         over = 0;
1044         for (i = 0; i <= maxid; i++) {
1045                 if ((cpumask & (1ul << i)) == 0)
1046                         continue;
1047                 total = 0;
1048                 for (state = 0; state < CPUSTATES; ++state)
1049                         total += cur_cp_times[i * CPUSTATES + state];
1050                 if (total)
1051                         lpct = 100.0 / total;
1052                 else
1053                         lpct = 0.0;
1054                 printf(" ");
1055                 percent((cur_cp_times[i * CPUSTATES + CP_USER] +
1056                          cur_cp_times[i * CPUSTATES + CP_NICE]) * lpct, &over);
1057                 printf(" ");
1058                 percent((cur_cp_times[i * CPUSTATES + CP_SYS] +
1059                          cur_cp_times[i * CPUSTATES + CP_INTR]) * lpct, &over);
1060                 printf(" ");
1061                 percent(cur_cp_times[i * CPUSTATES + CP_IDLE] * lpct, &over);
1062         }
1063 }
1064
1065 static void
1066 dointr(void)
1067 {
1068         unsigned long *intrcnt, uptime;
1069         uint64_t inttotal;
1070         size_t clen, inamlen, intrcntlen, istrnamlen;
1071         unsigned int i, nintr;
1072         char *intrname, *tintrname;
1073
1074         uptime = getuptime();
1075         if (kd != NULL) {
1076                 intrcntlen = namelist[X_EINTRCNT].n_value -
1077                     namelist[X_INTRCNT].n_value;
1078                 inamlen = namelist[X_EINTRNAMES].n_value -
1079                     namelist[X_INTRNAMES].n_value;
1080                 if ((intrcnt = malloc(intrcntlen)) == NULL ||
1081                     (intrname = malloc(inamlen)) == NULL)
1082                         err(1, "malloc()");
1083                 kread(X_INTRCNT, intrcnt, intrcntlen);
1084                 kread(X_INTRNAMES, intrname, inamlen);
1085         } else {
1086                 for (intrcnt = NULL, intrcntlen = 1024; ; intrcntlen *= 2) {
1087                         if ((intrcnt = reallocf(intrcnt, intrcntlen)) == NULL)
1088                                 err(1, "reallocf()");
1089                         if (mysysctl("hw.intrcnt",
1090                             intrcnt, &intrcntlen, NULL, 0) == 0)
1091                                 break;
1092                 }
1093                 for (intrname = NULL, inamlen = 1024; ; inamlen *= 2) {
1094                         if ((intrname = reallocf(intrname, inamlen)) == NULL)
1095                                 err(1, "reallocf()");
1096                         if (mysysctl("hw.intrnames",
1097                             intrname, &inamlen, NULL, 0) == 0)
1098                                 break;
1099                 }
1100         }
1101         nintr = intrcntlen / sizeof(unsigned long);
1102         tintrname = intrname;
1103         istrnamlen = strlen("interrupt");
1104         for (i = 0; i < nintr; i++) {
1105                 clen = strlen(tintrname);
1106                 if (clen > istrnamlen)
1107                         istrnamlen = clen;
1108                 tintrname += clen + 1;
1109         }
1110         (void)printf("%-*s %20s %10s\n", istrnamlen, "interrupt", "total",
1111             "rate");
1112         inttotal = 0;
1113         for (i = 0; i < nintr; i++) {
1114                 if (intrname[0] != '\0' && (*intrcnt != 0 || aflag))
1115                         (void)printf("%-*s %20lu %10lu\n", istrnamlen, intrname,
1116                             *intrcnt, *intrcnt / uptime);
1117                 intrname += strlen(intrname) + 1;
1118                 inttotal += *intrcnt++;
1119         }
1120         (void)printf("%-*s %20llu %10llu\n", istrnamlen, "Total",
1121             (long long)inttotal, (long long)(inttotal / uptime));
1122 }
1123
1124 static void
1125 domemstat_malloc(void)
1126 {
1127         struct memory_type_list *mtlp;
1128         struct memory_type *mtp;
1129         int error, first, i;
1130
1131         mtlp = memstat_mtl_alloc();
1132         if (mtlp == NULL) {
1133                 warn("memstat_mtl_alloc");
1134                 return;
1135         }
1136         if (kd == NULL) {
1137                 if (memstat_sysctl_malloc(mtlp, 0) < 0) {
1138                         warnx("memstat_sysctl_malloc: %s",
1139                             memstat_strerror(memstat_mtl_geterror(mtlp)));
1140                         return;
1141                 }
1142         } else {
1143                 if (memstat_kvm_malloc(mtlp, kd) < 0) {
1144                         error = memstat_mtl_geterror(mtlp);
1145                         if (error == MEMSTAT_ERROR_KVM)
1146                                 warnx("memstat_kvm_malloc: %s",
1147                                     kvm_geterr(kd));
1148                         else
1149                                 warnx("memstat_kvm_malloc: %s",
1150                                     memstat_strerror(error));
1151                 }
1152         }
1153         printf("%13s %5s %6s %7s %8s  Size(s)\n", "Type", "InUse", "MemUse",
1154             "HighUse", "Requests");
1155         for (mtp = memstat_mtl_first(mtlp); mtp != NULL;
1156             mtp = memstat_mtl_next(mtp)) {
1157                 if (memstat_get_numallocs(mtp) == 0 &&
1158                     memstat_get_count(mtp) == 0)
1159                         continue;
1160                 printf("%13s %5lld %5lldK %7s %8lld  ",
1161                     memstat_get_name(mtp), memstat_get_count(mtp),
1162                     ((int64_t)memstat_get_bytes(mtp) + 1023) / 1024, "-",
1163                     memstat_get_numallocs(mtp));
1164                 first = 1;
1165                 for (i = 0; i < 32; i++) {
1166                         if (memstat_get_sizemask(mtp) & (1 << i)) {
1167                                 if (!first)
1168                                         printf(",");
1169                                 printf("%d", 1 << (i + 4));
1170                                 first = 0;
1171                         }
1172                 }
1173                 printf("\n");
1174         }
1175         memstat_mtl_free(mtlp);
1176 }
1177
1178 static void
1179 domemstat_zone(void)
1180 {
1181         struct memory_type_list *mtlp;
1182         struct memory_type *mtp;
1183         char name[MEMTYPE_MAXNAME + 1];
1184         int error;
1185
1186         mtlp = memstat_mtl_alloc();
1187         if (mtlp == NULL) {
1188                 warn("memstat_mtl_alloc");
1189                 return;
1190         }
1191         if (kd == NULL) {
1192                 if (memstat_sysctl_uma(mtlp, 0) < 0) {
1193                         warnx("memstat_sysctl_uma: %s",
1194                             memstat_strerror(memstat_mtl_geterror(mtlp)));
1195                         return;
1196                 }
1197         } else {
1198                 if (memstat_kvm_uma(mtlp, kd) < 0) {
1199                         error = memstat_mtl_geterror(mtlp);
1200                         if (error == MEMSTAT_ERROR_KVM)
1201                                 warnx("memstat_kvm_uma: %s",
1202                                     kvm_geterr(kd));
1203                         else
1204                                 warnx("memstat_kvm_uma: %s",
1205                                     memstat_strerror(error));
1206                 }
1207         }
1208         printf("%-20s %8s  %8s  %8s  %8s  %8s  %8s\n\n", "ITEM", "SIZE",
1209             "LIMIT", "USED", "FREE", "REQUESTS", "FAILURES");
1210         for (mtp = memstat_mtl_first(mtlp); mtp != NULL;
1211             mtp = memstat_mtl_next(mtp)) {
1212                 strlcpy(name, memstat_get_name(mtp), MEMTYPE_MAXNAME);
1213                 strcat(name, ":");
1214                 printf("%-20s %8llu, %8llu, %8llu, %8llu, %8llu, %8llu\n", name,
1215                     memstat_get_size(mtp), memstat_get_countlimit(mtp),
1216                     memstat_get_count(mtp), memstat_get_free(mtp),
1217                     memstat_get_numallocs(mtp), memstat_get_failures(mtp));
1218         }
1219         memstat_mtl_free(mtlp);
1220         printf("\n");
1221 }
1222
1223 /*
1224  * kread reads something from the kernel, given its nlist index.
1225  */
1226 static void
1227 kreado(int nlx, void *addr, size_t size, size_t offset)
1228 {
1229         const char *sym;
1230
1231         if (namelist[nlx].n_type == 0 || namelist[nlx].n_value == 0) {
1232                 sym = namelist[nlx].n_name;
1233                 if (*sym == '_')
1234                         ++sym;
1235                 errx(1, "symbol %s not defined", sym);
1236         }
1237         if ((size_t)kvm_read(kd, namelist[nlx].n_value + offset, addr,
1238             size) != size) {
1239                 sym = namelist[nlx].n_name;
1240                 if (*sym == '_')
1241                         ++sym;
1242                 errx(1, "%s: %s", sym, kvm_geterr(kd));
1243         }
1244 }
1245
1246 static void
1247 kread(int nlx, void *addr, size_t size)
1248 {
1249         kreado(nlx, addr, size, 0);
1250 }
1251
1252 static char *
1253 kgetstr(const char *strp)
1254 {
1255         int n = 0, size = 1;
1256         char *ret = NULL;
1257
1258         do {
1259                 if (size == n + 1) {
1260                         ret = realloc(ret, size);
1261                         if (ret == NULL)
1262                                 err(1, "%s: realloc", __func__);
1263                         size *= 2;
1264                 }
1265                 if (kvm_read(kd, (u_long)strp + n, &ret[n], 1) != 1)
1266                         errx(1, "%s: %s", __func__, kvm_geterr(kd));
1267         } while (ret[n++] != '\0');
1268         return (ret);
1269 }
1270
1271 static void
1272 usage(void)
1273 {
1274         (void)fprintf(stderr, "%s%s",
1275                 "usage: vmstat [-afHhimPsz] [-c count] [-M core [-N system]] [-w wait]\n",
1276                 "              [-n devs] [-p type,if,pass] [disks]\n");
1277         exit(1);
1278 }