machine.c revision 1.48
1/* $OpenBSD: machine.c,v 1.48 2005/06/08 22:36:43 millert Exp $ */ 2 3/*- 4 * Copyright (c) 1994 Thorsten Lockert <tholo@sigmasoft.com> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * AUTHOR: Thorsten Lockert <tholo@sigmasoft.com> 30 * Adapted from BSD4.4 by Christos Zoulas <christos@ee.cornell.edu> 31 * Patch for process wait display by Jarl F. Greipsland <jarle@idt.unit.no> 32 * Patch for -DORDER by Kenneth Stailey <kstailey@disclosure.com> 33 * Patch for new swapctl(2) by Tobias Weingartner <weingart@openbsd.org> 34 */ 35 36#include <sys/types.h> 37#include <sys/signal.h> 38#include <sys/param.h> 39#include <stdio.h> 40#include <stdlib.h> 41#include <string.h> 42#include <limits.h> 43#include <err.h> 44#include <math.h> 45#include <unistd.h> 46#include <sys/errno.h> 47#include <sys/sysctl.h> 48#include <sys/dir.h> 49#include <sys/dkstat.h> 50#include <sys/file.h> 51#include <sys/time.h> 52#include <sys/resource.h> 53#include <sys/swap.h> 54#include <err.h> 55 56#include "top.h" 57#include "display.h" 58#include "machine.h" 59#include "utils.h" 60#include "loadavg.h" 61 62static int swapmode(int *, int *); 63 64/* get_process_info passes back a handle. This is what it looks like: */ 65 66struct handle { 67 struct kinfo_proc2 **next_proc; /* points to next valid proc pointer */ 68 int remaining; /* number of pointers remaining */ 69}; 70 71/* what we consider to be process size: */ 72#define PROCSIZE(pp) ((pp)->p_vm_tsize + (pp)->p_vm_dsize + (pp)->p_vm_ssize) 73 74/* 75 * These definitions control the format of the per-process area 76 */ 77static char header[] = 78 " PID X PRI NICE SIZE RES STATE WAIT TIME CPU COMMAND"; 79 80/* 0123456 -- field to fill in starts at header+6 */ 81#define UNAME_START 6 82 83#define Proc_format \ 84 "%5d %-8.8s %3d %4d %5s %5s %-8s %-6.6s %6s %5.2f%% %.11s" 85 86/* process state names for the "STATE" column of the display */ 87/* 88 * the extra nulls in the string "run" are for adding a slash and the 89 * processor number when needed 90 */ 91 92char *state_abbrev[] = { 93 "", "start", "run", "sleep", "stop", "zomb", "dead", "onproc" 94}; 95 96static int stathz; 97 98/* these are for calculating cpu state percentages */ 99static int64_t **cp_time; 100static int64_t **cp_old; 101static int64_t **cp_diff; 102 103/* these are for detailing the process states */ 104int process_states[8]; 105char *procstatenames[] = { 106 "", " starting, ", " running, ", " idle, ", 107 " stopped, ", " zombie, ", " dead, ", " on processor, ", 108 NULL 109}; 110 111/* these are for detailing the cpu states */ 112int64_t *cpu_states; 113char *cpustatenames[] = { 114 "user", "nice", "system", "interrupt", "idle", NULL 115}; 116 117/* these are for detailing the memory statistics */ 118int memory_stats[8]; 119char *memorynames[] = { 120 "Real: ", "K/", "K act/tot ", "Free: ", "K ", 121 "Swap: ", "K/", "K used/tot", 122 NULL 123}; 124 125/* these are names given to allowed sorting orders -- first is default */ 126char *ordernames[] = { 127 "cpu", "size", "res", "time", "pri", NULL 128}; 129 130/* these are for keeping track of the proc array */ 131static int nproc; 132static int onproc = -1; 133static int pref_len; 134static struct kinfo_proc2 *pbase; 135static struct kinfo_proc2 **pref; 136 137/* these are for getting the memory statistics */ 138static int pageshift; /* log base 2 of the pagesize */ 139 140/* define pagetok in terms of pageshift */ 141#define pagetok(size) ((size) << pageshift) 142 143int ncpu; 144 145unsigned int maxslp; 146 147static int 148getstathz(void) 149{ 150 struct clockinfo cinf; 151 size_t size = sizeof(cinf); 152 int mib[2]; 153 154 mib[0] = CTL_KERN; 155 mib[1] = KERN_CLOCKRATE; 156 if (sysctl(mib, 2, &cinf, &size, NULL, 0) == -1) 157 return (-1); 158 return (cinf.stathz); 159} 160 161int 162machine_init(struct statics *statics) 163{ 164 size_t size = sizeof(ncpu); 165 int mib[2], pagesize, cpu; 166 167 mib[0] = CTL_HW; 168 mib[1] = HW_NCPU; 169 if (sysctl(mib, 2, &ncpu, &size, NULL, 0) == -1) 170 return (-1); 171 cpu_states = malloc(ncpu * CPUSTATES * sizeof(int64_t)); 172 if (cpu_states == NULL) 173 err(1, NULL); 174 cp_time = malloc(ncpu * sizeof(int64_t *)); 175 cp_old = malloc(ncpu * sizeof(int64_t *)); 176 cp_diff = malloc(ncpu * sizeof(int64_t *)); 177 if (cp_time == NULL || cp_old == NULL || cp_diff == NULL) 178 err(1, NULL); 179 for (cpu = 0; cpu < ncpu; cpu++) { 180 cp_time[cpu] = malloc(CPUSTATES * sizeof(int64_t)); 181 cp_old[cpu] = malloc(CPUSTATES * sizeof(int64_t)); 182 cp_diff[cpu] = malloc(CPUSTATES * sizeof(int64_t)); 183 if (cp_time[cpu] == NULL || cp_old[cpu] == NULL || 184 cp_diff[cpu] == NULL) 185 err(1, NULL); 186 } 187 188 stathz = getstathz(); 189 if (stathz == -1) 190 return (-1); 191 192 pbase = NULL; 193 pref = NULL; 194 onproc = -1; 195 nproc = 0; 196 197 /* 198 * get the page size with "getpagesize" and calculate pageshift from 199 * it 200 */ 201 pagesize = getpagesize(); 202 pageshift = 0; 203 while (pagesize > 1) { 204 pageshift++; 205 pagesize >>= 1; 206 } 207 208 /* we only need the amount of log(2)1024 for our conversion */ 209 pageshift -= LOG1024; 210 211 /* fill in the statics information */ 212 statics->procstate_names = procstatenames; 213 statics->cpustate_names = cpustatenames; 214 statics->memory_names = memorynames; 215 statics->order_names = ordernames; 216 return (0); 217} 218 219char * 220format_header(char *uname_field) 221{ 222 char *ptr; 223 224 ptr = header + UNAME_START; 225 while (*uname_field != '\0') 226 *ptr++ = *uname_field++; 227 return (header); 228} 229 230void 231get_system_info(struct system_info *si) 232{ 233 static int sysload_mib[] = {CTL_VM, VM_LOADAVG}; 234 static int vmtotal_mib[] = {CTL_VM, VM_METER}; 235 struct loadavg sysload; 236 struct vmtotal vmtotal; 237 double *infoloadp; 238 size_t size; 239 int i; 240 int64_t *tmpstate; 241 242 if (ncpu > 1) { 243 size = CPUSTATES * sizeof(int64_t); 244 for (i = 0; i < ncpu; i++) { 245 int cp_time_mib[] = {CTL_KERN, KERN_CPTIME2, i}; 246 tmpstate = cpu_states + (CPUSTATES * i); 247 if (sysctl(cp_time_mib, 3, cp_time[i], &size, NULL, 0) < 0) 248 warn("sysctl kern.cp_time2 failed"); 249 /* convert cp_time2 counts to percentages */ 250 (void) percentages(CPUSTATES, tmpstate, cp_time[i], 251 cp_old[i], cp_diff[i]); 252 } 253 } else { 254 int cp_time_mib[] = {CTL_KERN, KERN_CPTIME}; 255 long cp_time_tmp[CPUSTATES]; 256 257 size = sizeof(cp_time_tmp); 258 if (sysctl(cp_time_mib, 2, cp_time_tmp, &size, NULL, 0) < 0) 259 warn("sysctl kern.cp_time failed"); 260 for (i = 0; i < CPUSTATES; i++) 261 cp_time[0][i] = cp_time_tmp[i]; 262 /* convert cp_time counts to percentages */ 263 (void) percentages(CPUSTATES, cpu_states, cp_time[0], 264 cp_old[0], cp_diff[0]); 265 } 266 267 size = sizeof(sysload); 268 if (sysctl(sysload_mib, 2, &sysload, &size, NULL, 0) < 0) 269 warn("sysctl failed"); 270 infoloadp = si->load_avg; 271 for (i = 0; i < 3; i++) 272 *infoloadp++ = ((double) sysload.ldavg[i]) / sysload.fscale; 273 274 275 /* get total -- systemwide main memory usage structure */ 276 size = sizeof(vmtotal); 277 if (sysctl(vmtotal_mib, 2, &vmtotal, &size, NULL, 0) < 0) { 278 warn("sysctl failed"); 279 bzero(&vmtotal, sizeof(vmtotal)); 280 } 281 /* convert memory stats to Kbytes */ 282 memory_stats[0] = -1; 283 memory_stats[1] = pagetok(vmtotal.t_arm); 284 memory_stats[2] = pagetok(vmtotal.t_rm); 285 memory_stats[3] = -1; 286 memory_stats[4] = pagetok(vmtotal.t_free); 287 memory_stats[5] = -1; 288 289 if (!swapmode(&memory_stats[6], &memory_stats[7])) { 290 memory_stats[6] = 0; 291 memory_stats[7] = 0; 292 } 293 294 /* set arrays and strings */ 295 si->cpustates = cpu_states; 296 si->memory = memory_stats; 297 si->last_pid = -1; 298} 299 300static struct handle handle; 301 302struct kinfo_proc2 * 303getprocs(int op, int arg, int *cnt) 304{ 305 size_t size; 306 int mib[6] = {CTL_KERN, KERN_PROC2, 0, 0, sizeof(struct kinfo_proc2), 0}; 307 static int maxslp_mib[] = {CTL_VM, VM_MAXSLP}; 308 static struct kinfo_proc2 *procbase; 309 int st; 310 311 mib[2] = op; 312 mib[3] = arg; 313 314 size = sizeof(maxslp); 315 if (sysctl(maxslp_mib, 2, &maxslp, &size, NULL, 0) < 0) { 316 warn("sysctl vm.maxslp failed"); 317 return (0); 318 } 319 retry: 320 free(procbase); 321 st = sysctl(mib, 6, NULL, &size, NULL, 0); 322 if (st == -1) { 323 /* _kvm_syserr(kd, kd->program, "kvm_getproc2"); */ 324 return (0); 325 } 326 size = 5 * size / 4; /* extra slop */ 327 if ((procbase = malloc(size)) == NULL) 328 return (0); 329 mib[5] = (int)(size / sizeof(struct kinfo_proc2)); 330 st = sysctl(mib, 6, procbase, &size, NULL, 0); 331 if (st == -1) { 332 if (errno == ENOMEM) 333 goto retry; 334 /* _kvm_syserr(kd, kd->program, "kvm_getproc2"); */ 335 return (0); 336 } 337 *cnt = (int)(size / sizeof(struct kinfo_proc2)); 338 return (procbase); 339} 340 341caddr_t 342get_process_info(struct system_info *si, struct process_select *sel, 343 int (*compare) (const void *, const void *)) 344{ 345 int show_idle, show_system, show_uid, show_pid; 346 int total_procs, active_procs; 347 struct kinfo_proc2 **prefp, *pp; 348 349 if ((pbase = getprocs(KERN_PROC_KTHREAD, 0, &nproc)) == NULL) { 350 /* warnx("%s", kvm_geterr(kd)); */ 351 quit(23); 352 } 353 if (nproc > onproc) 354 pref = (struct kinfo_proc2 **)realloc(pref, 355 sizeof(struct kinfo_proc2 *) * (onproc = nproc)); 356 if (pref == NULL) { 357 warnx("Out of memory."); 358 quit(23); 359 } 360 /* get a pointer to the states summary array */ 361 si->procstates = process_states; 362 363 /* set up flags which define what we are going to select */ 364 show_idle = sel->idle; 365 show_system = sel->system; 366 show_uid = sel->uid != (uid_t)-1; 367 show_pid = sel->pid != (pid_t)-1; 368 369 /* count up process states and get pointers to interesting procs */ 370 total_procs = 0; 371 active_procs = 0; 372 memset((char *) process_states, 0, sizeof(process_states)); 373 prefp = pref; 374 for (pp = pbase; pp < &pbase[nproc]; pp++) { 375 /* 376 * Place pointers to each valid proc structure in pref[]. 377 * Process slots that are actually in use have a non-zero 378 * status field. Processes with SSYS set are system 379 * processes---these get ignored unless show_sysprocs is set. 380 */ 381 if (pp->p_stat != 0 && 382 (show_system || (pp->p_flag & P_SYSTEM) == 0)) { 383 total_procs++; 384 process_states[(unsigned char) pp->p_stat]++; 385 if (pp->p_stat != SZOMB && 386 (show_idle || pp->p_pctcpu != 0 || 387 pp->p_stat == SRUN) && 388 (!show_uid || pp->p_ruid == sel->uid) && 389 (!show_pid || pp->p_pid == sel->pid)) { 390 *prefp++ = pp; 391 active_procs++; 392 } 393 } 394 } 395 396 /* if requested, sort the "interesting" processes */ 397 if (compare != NULL) 398 qsort((char *) pref, active_procs, 399 sizeof(struct kinfo_proc2 *), compare); 400 /* remember active and total counts */ 401 si->p_total = total_procs; 402 si->p_active = pref_len = active_procs; 403 404 /* pass back a handle */ 405 handle.next_proc = pref; 406 handle.remaining = active_procs; 407 return ((caddr_t) & handle); 408} 409 410char fmt[MAX_COLS]; /* static area where result is built */ 411 412char * 413state_abbr(struct kinfo_proc2 *pp) 414{ 415 static char buf[10]; 416 417 if (ncpu > 1 && pp->p_cpuid != KI_NOCPU) 418 snprintf(buf, sizeof buf, "%s/%llu", 419 state_abbrev[(unsigned char)pp->p_stat], pp->p_cpuid); 420 else 421 snprintf(buf, sizeof buf, "%s", 422 state_abbrev[(unsigned char)pp->p_stat]); 423 return buf; 424} 425 426char * 427format_next_process(caddr_t handle, char *(*get_userid)(uid_t)) 428{ 429 char *p_wait, waddr[sizeof(void *) * 2 + 3]; /* Hexify void pointer */ 430 struct kinfo_proc2 *pp; 431 struct handle *hp; 432 int cputime; 433 double pct; 434 435 /* find and remember the next proc structure */ 436 hp = (struct handle *) handle; 437 pp = *(hp->next_proc++); 438 hp->remaining--; 439 440 if ((pp->p_flag & P_INMEM) == 0) { 441 /* 442 * Print swapped processes as <pname> 443 */ 444 char buf[sizeof(pp->p_comm)]; 445 446 (void) strlcpy(buf, pp->p_comm, sizeof(buf)); 447 (void) snprintf(pp->p_comm, sizeof(pp->p_comm), "<%s>", buf); 448 } 449 cputime = (pp->p_uticks + pp->p_sticks + pp->p_iticks) / stathz; 450 451 /* calculate the base for cpu percentages */ 452 pct = pctdouble(pp->p_pctcpu); 453 454 if (pp->p_wchan) { 455 if (pp->p_wmesg) 456 p_wait = pp->p_wmesg; 457 else { 458 snprintf(waddr, sizeof(waddr), "%llx", 459 pp->p_wchan & ~KERNBASE); 460 p_wait = waddr; 461 } 462 } else 463 p_wait = "-"; 464 465 /* format this entry */ 466 snprintf(fmt, sizeof fmt, Proc_format, 467 pp->p_pid, (*get_userid)(pp->p_ruid), 468 pp->p_priority - PZERO, pp->p_nice - NZERO, 469 format_k(pagetok(PROCSIZE(pp))), 470 format_k(pagetok(pp->p_vm_rssize)), 471 (pp->p_stat == SSLEEP && pp->p_slptime > maxslp) ? 472 "idle" : state_abbr(pp), 473 p_wait, format_time(cputime), 100.0 * pct, 474 printable(pp->p_comm)); 475 476 /* return the result */ 477 return (fmt); 478} 479 480/* comparison routine for qsort */ 481static unsigned char sorted_state[] = 482{ 483 0, /* not used */ 484 4, /* start */ 485 5, /* run */ 486 2, /* sleep */ 487 3, /* stop */ 488 1 /* zombie */ 489}; 490 491/* 492 * proc_compares - comparison functions for "qsort" 493 */ 494 495/* 496 * First, the possible comparison keys. These are defined in such a way 497 * that they can be merely listed in the source code to define the actual 498 * desired ordering. 499 */ 500 501#define ORDERKEY_PCTCPU \ 502 if (lresult = (pctcpu)p2->p_pctcpu - (pctcpu)p1->p_pctcpu, \ 503 (result = lresult > 0 ? 1 : lresult < 0 ? -1 : 0) == 0) 504#define ORDERKEY_CPUTIME \ 505 if ((result = p2->p_rtime_sec - p1->p_rtime_sec) == 0) \ 506 if ((result = p2->p_rtime_usec - p1->p_rtime_usec) == 0) 507#define ORDERKEY_STATE \ 508 if ((result = sorted_state[(unsigned char)p2->p_stat] - \ 509 sorted_state[(unsigned char)p1->p_stat]) == 0) 510#define ORDERKEY_PRIO \ 511 if ((result = p2->p_priority - p1->p_priority) == 0) 512#define ORDERKEY_RSSIZE \ 513 if ((result = p2->p_vm_rssize - p1->p_vm_rssize) == 0) 514#define ORDERKEY_MEM \ 515 if ((result = PROCSIZE(p2) - PROCSIZE(p1)) == 0) 516 517/* compare_cpu - the comparison function for sorting by cpu percentage */ 518static int 519compare_cpu(const void *v1, const void *v2) 520{ 521 struct proc **pp1 = (struct proc **) v1; 522 struct proc **pp2 = (struct proc **) v2; 523 struct kinfo_proc2 *p1, *p2; 524 pctcpu lresult; 525 int result; 526 527 /* remove one level of indirection */ 528 p1 = *(struct kinfo_proc2 **) pp1; 529 p2 = *(struct kinfo_proc2 **) pp2; 530 531 ORDERKEY_PCTCPU 532 ORDERKEY_CPUTIME 533 ORDERKEY_STATE 534 ORDERKEY_PRIO 535 ORDERKEY_RSSIZE 536 ORDERKEY_MEM 537 ; 538 return (result); 539} 540 541/* compare_size - the comparison function for sorting by total memory usage */ 542static int 543compare_size(const void *v1, const void *v2) 544{ 545 struct proc **pp1 = (struct proc **) v1; 546 struct proc **pp2 = (struct proc **) v2; 547 struct kinfo_proc2 *p1, *p2; 548 pctcpu lresult; 549 int result; 550 551 /* remove one level of indirection */ 552 p1 = *(struct kinfo_proc2 **) pp1; 553 p2 = *(struct kinfo_proc2 **) pp2; 554 555 ORDERKEY_MEM 556 ORDERKEY_RSSIZE 557 ORDERKEY_PCTCPU 558 ORDERKEY_CPUTIME 559 ORDERKEY_STATE 560 ORDERKEY_PRIO 561 ; 562 return (result); 563} 564 565/* compare_res - the comparison function for sorting by resident set size */ 566static int 567compare_res(const void *v1, const void *v2) 568{ 569 struct proc **pp1 = (struct proc **) v1; 570 struct proc **pp2 = (struct proc **) v2; 571 struct kinfo_proc2 *p1, *p2; 572 pctcpu lresult; 573 int result; 574 575 /* remove one level of indirection */ 576 p1 = *(struct kinfo_proc2 **) pp1; 577 p2 = *(struct kinfo_proc2 **) pp2; 578 579 ORDERKEY_RSSIZE 580 ORDERKEY_MEM 581 ORDERKEY_PCTCPU 582 ORDERKEY_CPUTIME 583 ORDERKEY_STATE 584 ORDERKEY_PRIO 585 ; 586 return (result); 587} 588 589/* compare_time - the comparison function for sorting by CPU time */ 590static int 591compare_time(const void *v1, const void *v2) 592{ 593 struct proc **pp1 = (struct proc **) v1; 594 struct proc **pp2 = (struct proc **) v2; 595 struct kinfo_proc2 *p1, *p2; 596 pctcpu lresult; 597 int result; 598 599 /* remove one level of indirection */ 600 p1 = *(struct kinfo_proc2 **) pp1; 601 p2 = *(struct kinfo_proc2 **) pp2; 602 603 ORDERKEY_CPUTIME 604 ORDERKEY_PCTCPU 605 ORDERKEY_STATE 606 ORDERKEY_PRIO 607 ORDERKEY_MEM 608 ORDERKEY_RSSIZE 609 ; 610 return (result); 611} 612 613/* compare_prio - the comparison function for sorting by CPU time */ 614static int 615compare_prio(const void *v1, const void *v2) 616{ 617 struct proc **pp1 = (struct proc **) v1; 618 struct proc **pp2 = (struct proc **) v2; 619 struct kinfo_proc2 *p1, *p2; 620 pctcpu lresult; 621 int result; 622 623 /* remove one level of indirection */ 624 p1 = *(struct kinfo_proc2 **) pp1; 625 p2 = *(struct kinfo_proc2 **) pp2; 626 627 ORDERKEY_PRIO 628 ORDERKEY_PCTCPU 629 ORDERKEY_CPUTIME 630 ORDERKEY_STATE 631 ORDERKEY_RSSIZE 632 ORDERKEY_MEM 633 ; 634 return (result); 635} 636 637int (*proc_compares[])(const void *, const void *) = { 638 compare_cpu, 639 compare_size, 640 compare_res, 641 compare_time, 642 compare_prio, 643 NULL 644}; 645 646/* 647 * proc_owner(pid) - returns the uid that owns process "pid", or -1 if 648 * the process does not exist. 649 * It is EXTREMELY IMPORTANT that this function work correctly. 650 * If top runs setuid root (as in SVR4), then this function 651 * is the only thing that stands in the way of a serious 652 * security problem. It validates requests for the "kill" 653 * and "renice" commands. 654 */ 655uid_t 656proc_owner(pid_t pid) 657{ 658 struct kinfo_proc2 **prefp, *pp; 659 int cnt; 660 661 prefp = pref; 662 cnt = pref_len; 663 while (--cnt >= 0) { 664 pp = *prefp++; 665 if (pp->p_pid == pid) 666 return ((uid_t)pp->p_ruid); 667 } 668 return (uid_t)(-1); 669} 670 671/* 672 * swapmode is rewritten by Tobias Weingartner <weingart@openbsd.org> 673 * to be based on the new swapctl(2) system call. 674 */ 675static int 676swapmode(int *used, int *total) 677{ 678 struct swapent *swdev; 679 int nswap, rnswap, i; 680 681 nswap = swapctl(SWAP_NSWAP, 0, 0); 682 if (nswap == 0) 683 return 0; 684 685 swdev = malloc(nswap * sizeof(*swdev)); 686 if (swdev == NULL) 687 return 0; 688 689 rnswap = swapctl(SWAP_STATS, swdev, nswap); 690 if (rnswap == -1) 691 return 0; 692 693 /* if rnswap != nswap, then what? */ 694 695 /* Total things up */ 696 *total = *used = 0; 697 for (i = 0; i < nswap; i++) { 698 if (swdev[i].se_flags & SWF_ENABLE) { 699 *used += (swdev[i].se_inuse / (1024 / DEV_BSIZE)); 700 *total += (swdev[i].se_nblks / (1024 / DEV_BSIZE)); 701 } 702 } 703 free(swdev); 704 return 1; 705} 706