sbin/savecore/savecore.c

   1 /*-
   2  * Copyright (c) 2002 Poul-Henning Kamp
   3  * Copyright (c) 2002 Networks Associates Technology, Inc.
   4  * All rights reserved.
   5  *
   6  * This software was developed for the FreeBSD Project by Poul-Henning Kamp
   7  * and NAI Labs, the Security Research Division of Network Associates, Inc.
   8  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
   9  * DARPA CHATS research program.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. The names of the authors may not be used to endorse or promote
  20  *    products derived from this software without specific prior written
  21  *    permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  * Copyright (c) 1986, 1992, 1993
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  */
  62
  63 #include <sys/param.h>
  64 #include <sys/kerneldump.h>
  65 #include <sys/diskslice.h>
  66 #include <sys/ioctl.h>
  67 #include <sys/mount.h>
  68 #include <sys/stat.h>
  69 #include <errno.h>
  70 #include <fcntl.h>
  71 #include <fstab.h>
  72 #include <paths.h>
  73 #include <stdarg.h>
  74 #include <stdio.h>
  75 #include <stdlib.h>
  76 #include <string.h>
  77 #include <syslog.h>
  78 #include <time.h>
  79 #include <unistd.h>
  80
  81 /* The size of the buffer used for I/O. */
  82 #define BUFFERSIZE      (1024*1024)
  83
  84 #define STATUS_BAD      0
  85 #define STATUS_GOOD     1
  86 #define STATUS_UNKNOWN  2
  87
  88 static int checkfor, compress, clear, force, keep, verbose;     /* flags */
  89 static int nfound, nsaved, nerr;                        /* statistics */
  90
  91 extern FILE *zopen(const char *, const char *);
  92
  93 static void
  94 printheader(FILE *f, const struct kerneldumpheader *h, const char *device,
  95     int bounds, const int status)
  96 {
  97         uint64_t dumplen;
  98         time_t t;
  99         const char *stat_str;
 100
 101         fprintf(f, "Dump header from device %s\n", device);
 102         fprintf(f, "  Architecture: %s\n", h->architecture);
 103         fprintf(f, "  Architecture Version: %u\n",
 104             dtoh32(h->architectureversion));
 105         dumplen = dtoh64(h->dumplength);
 106         fprintf(f, "  Dump Length: %lldB (%lld MB)\n", (long long)dumplen,
 107             (long long)(dumplen >> 20));
 108         fprintf(f, "  Blocksize: %d\n", dtoh32(h->blocksize));
 109         t = dtoh64(h->dumptime);
 110         fprintf(f, "  Dumptime: %s", ctime(&t));
 111         fprintf(f, "  Hostname: %s\n", h->hostname);
 112         fprintf(f, "  Magic: %s\n", h->magic);
 113         fprintf(f, "  Version String: %s", h->versionstring);
 114         fprintf(f, "  Panic String: %s\n", h->panicstring);
 115         fprintf(f, "  Dump Parity: %u\n", h->parity);
 116         fprintf(f, "  Bounds: %d\n", bounds);
 117
 118         switch(status) {
 119         case STATUS_BAD:
 120                 stat_str = "bad";
 121                 break;
 122         case STATUS_GOOD:
 123                 stat_str = "good";
 124                 break;
 125         default:
 126                 stat_str = "unknown";
 127         }
 128         fprintf(f, "  Dump Status: %s\n", stat_str);
 129         fflush(f);
 130 }
 131
 132 static int
 133 getbounds(void) {
 134         FILE *fp;
 135         char buf[6];
 136         int ret;
 137
 138         ret = 0;
 139
 140         if ((fp = fopen("bounds", "r")) == NULL) {
 141                 if (verbose)
 142                         printf("unable to open bounds file, using 0\n");
 143                 return (ret);
 144         }
 145
 146         if (fgets(buf, sizeof buf, fp) == NULL) {
 147                 syslog(LOG_WARNING, "unable to read from bounds, using 0");
 148                 fclose(fp);
 149                 return (ret);
 150         }
 151
 152         errno = 0;
 153         ret = (int)strtol(buf, NULL, 10);
 154         if (ret == 0 && (errno == EINVAL || errno == ERANGE))
 155                 syslog(LOG_WARNING, "invalid value found in bounds, using 0");
 156         return (ret);
 157 }
 158
 159 static void
 160 writebounds(int bounds) {
 161         FILE *fp;
 162
 163         if ((fp = fopen("bounds", "w")) == NULL) {
 164                 syslog(LOG_WARNING, "unable to write to bounds file: %m");
 165                 return;
 166         }
 167
 168         if (verbose)
 169                 printf("bounds number: %d\n", bounds);
 170
 171         fprintf(fp, "%d\n", bounds);
 172         fclose(fp);
 173 }
 174
 175 /*
 176  * Check that sufficient space is available on the disk that holds the
 177  * save directory.
 178  */
 179 static int
 180 check_space(const char *savedir, off_t dumpsize)
 181 {
 182         FILE *fp;
 183         off_t minfree, spacefree, totfree, needed;
 184         struct statfs fsbuf;
 185         char buf[100], path[MAXPATHLEN];
 186
 187         if (statfs(savedir, &fsbuf) < 0) {
 188                 syslog(LOG_ERR, "%s: %m", savedir);
 189                 exit(1);
 190         }
 191         spacefree = ((off_t) fsbuf.f_bavail * fsbuf.f_bsize) / 1024;
 192         totfree = ((off_t) fsbuf.f_bfree * fsbuf.f_bsize) / 1024;
 193
 194         (void)snprintf(path, sizeof(path), "%s/minfree", savedir);
 195         if ((fp = fopen(path, "r")) == NULL)
 196                 minfree = 0;
 197         else {
 198                 if (fgets(buf, sizeof(buf), fp) == NULL)
 199                         minfree = 0;
 200                 else
 201                         minfree = atoi(buf);
 202                 (void)fclose(fp);
 203         }
 204
 205         needed = dumpsize / 1024 + 2;   /* 2 for info file */
 206         if (((minfree > 0) ? spacefree : totfree) - needed < minfree) {
 207                 syslog(LOG_WARNING,
 208         "no dump, not enough free space on device (%lld available, need %lld)",
 209                     (long long)(minfree > 0 ? spacefree : totfree),
 210                     (long long)needed);
 211                 return (0);
 212         }
 213         if (spacefree - needed < 0)
 214                 syslog(LOG_WARNING,
 215                     "dump performed, but free space threshold crossed");
 216         return (1);
 217 }
 218
 219 #define BLOCKSIZE (1<<12)
 220 #define BLOCKMASK (~(BLOCKSIZE-1))
 221
 222 static void
 223 DoFile(const char *savedir, const char *device)
 224 {
 225         static char *buf = NULL;
 226         struct partinfo dpart;
 227         struct kerneldumpheader kdhf, kdhl;
 228         off_t mediasize, dumpsize, firsthd, lasthd, dmpcnt;
 229         FILE *info, *fp, *fpkern;
 230         mode_t oumask;
 231         int fd, fdinfo, fdkernin, error, wl;
 232         int nr, nw, hs, he = 0;
 233         int bounds, status;
 234         u_int sectorsize;
 235
 236         bounds = getbounds();
 237         dmpcnt = 0;
 238         mediasize = 0;
 239         status = STATUS_UNKNOWN;
 240
 241         if (buf == NULL) {
 242                 buf = malloc(BUFFERSIZE);
 243                 if (buf == NULL) {
 244                         syslog(LOG_ERR, "%m");
 245                         return;
 246                 }
 247         }
 248
 249         if (verbose)
 250                 printf("checking for kernel dump on device %s\n", device);
 251
 252         fd = open(device, O_RDWR);
 253         if (fd < 0) {
 254                 syslog(LOG_ERR, "%s: %m", device);
 255                 return;
 256         }
 257
 258         bzero(&dpart, sizeof(dpart));
 259         error = ioctl(fd, DIOCGPART, &dpart);
 260         if (error) {
 261                 syslog(LOG_ERR,
 262                     "couldn't find media and/or sector size of %s: %m", device);
 263                 goto closefd;
 264         }
 265         mediasize = dpart.media_size;
 266         sectorsize = dpart.media_blksize;
 267
 268         if (verbose) {
 269                 printf("mediasize = %lld\n", (long long)mediasize);
 270                 printf("sectorsize = %u\n", sectorsize);
 271         }
 272
 273         lasthd = mediasize - sectorsize;
 274         lseek(fd, lasthd, SEEK_SET);
 275         error = read(fd, &kdhl, sizeof kdhl);
 276         if (error != sizeof kdhl) {
 277                 syslog(LOG_ERR,
 278                     "error reading last dump header at offset %lld in %s: %m",
 279                     (long long)lasthd, device);
 280                 goto closefd;
 281         }
 282         if (memcmp(kdhl.magic, KERNELDUMPMAGIC, sizeof kdhl.magic)) {
 283                 if (verbose)
 284                         printf("magic mismatch on last dump header on %s\n",
 285                             device);
 286
 287                 status = STATUS_BAD;
 288                 if (force == 0)
 289                         goto closefd;
 290
 291                 if (memcmp(kdhl.magic, KERNELDUMPMAGIC_CLEARED,
 292                             sizeof kdhl.magic) == 0) {
 293                         if (verbose)
 294                                 printf("forcing magic on %s\n", device);
 295                         memcpy(kdhl.magic, KERNELDUMPMAGIC,
 296                             sizeof kdhl.magic);
 297                 } else {
 298                         syslog(LOG_ERR, "unable to force dump - bad magic");
 299                         goto closefd;
 300                 }
 301         }
 302         if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
 303                 syslog(LOG_ERR,
 304                     "unknown version (%d) in last dump header on %s",
 305                     dtoh32(kdhl.version), device);
 306
 307                 status = STATUS_BAD;
 308                 if (force == 0)
 309                         goto closefd;
 310         }
 311
 312         nfound++;
 313         if (clear)
 314                 goto nuke;
 315
 316         if (kerneldump_parity(&kdhl)) {
 317                 syslog(LOG_ERR,
 318                     "parity error on last dump header on %s", device);
 319                 nerr++;
 320                 status = STATUS_BAD;
 321                 if (force == 0)
 322                         goto closefd;
 323         }
 324         dumpsize = dtoh64(kdhl.dumplength);
 325         firsthd = lasthd - dumpsize - sizeof kdhf;
 326         lseek(fd, firsthd, SEEK_SET);
 327         error = read(fd, &kdhf, sizeof kdhf);
 328         if (error != sizeof kdhf) {
 329                 syslog(LOG_ERR,
 330                     "error reading first dump header at offset %lld in %s: %m",
 331                     (long long)firsthd, device);
 332                 nerr++;
 333                 goto closefd;
 334         }
 335
 336         if (verbose >= 2) {
 337                 printf("First dump headers:\n");
 338                 printheader(stdout, &kdhf, device, bounds, -1);
 339
 340                 printf("\nLast dump headers:\n");
 341                 printheader(stdout, &kdhl, device, bounds, -1);
 342                 printf("\n");
 343         }
 344
 345         if (memcmp(&kdhl, &kdhf, sizeof kdhl)) {
 346                 syslog(LOG_ERR,
 347                     "first and last dump headers disagree on %s", device);
 348                 nerr++;
 349                 status = STATUS_BAD;
 350                 if (force == 0)
 351                         goto closefd;
 352         } else {
 353                 status = STATUS_GOOD;
 354         }
 355
 356         if (checkfor) {
 357                 printf("A dump exists on %s\n", device);
 358                 close(fd);
 359                 exit(0);
 360         }
 361
 362         if (kdhl.panicstring[0])
 363                 syslog(LOG_ALERT, "reboot after panic: %s", kdhl.panicstring);
 364         else
 365                 syslog(LOG_ALERT, "reboot");
 366
 367         if (verbose)
 368                 printf("Checking for available free space\n");
 369         if (!check_space(savedir, dumpsize)) {
 370                 nerr++;
 371                 goto closefd;
 372         }
 373
 374         writebounds(bounds + 1);
 375
 376         /*
 377          * Write kernel file.
 378          */
 379         fdkernin = open(getbootfile(), O_RDONLY, 0);
 380         if (fdkernin < 0) {
 381                 syslog(LOG_ERR, "%s: %m", getbootfile());
 382         }
 383
 384         if (compress) {
 385                 sprintf(buf, "kern.%d.gz", bounds);
 386                 fpkern = zopen(buf, "w");
 387         } else {
 388                 sprintf(buf, "kern.%d", bounds);
 389                 fpkern = fopen(buf, "w");
 390         }
 391         if (fpkern == NULL) {
 392                 syslog(LOG_ERR, "%s: %m", buf);
 393                 close(fdkernin);
 394         }
 395
 396         syslog(LOG_NOTICE, "writing %skernel to %s",
 397             compress ? "compressed " : "", buf);
 398
 399         while ((nr = read(fdkernin, buf, BUFFERSIZE)) > 0) {
 400                 nw = fwrite(buf, 1, nr, fpkern);
 401                 if (nw != nr) {
 402                         syslog(LOG_ERR, "kern.%d: %m", bounds);
 403                         syslog(LOG_WARNING,
 404                             "WARNING: kernel may be incomplete");
 405                         exit(1);
 406                 }
 407         }
 408         if (nr < 0) {
 409                 syslog(LOG_ERR, "%s: %m", getbootfile());
 410                 syslog(LOG_WARNING,
 411                     "WARNING: kernel may be incomplete");
 412                 exit(1);
 413         }
 414         fclose(fpkern);
 415         close(fdkernin);
 416
 417
 418         sprintf(buf, "info.%d", bounds);
 419
 420         /*
 421          * Create or overwrite any existing dump header files.
 422          */
 423         fdinfo = open(buf, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 424         if (fdinfo < 0) {
 425                 syslog(LOG_ERR, "%s: %m", buf);
 426                 nerr++;
 427                 goto closefd;
 428         }
 429         oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/
 430         if (compress) {
 431                 sprintf(buf, "vmcore.%d.gz", bounds);
 432                 fp = zopen(buf, "w");
 433         } else {
 434                 sprintf(buf, "vmcore.%d", bounds);
 435                 fp = fopen(buf, "w");
 436         }
 437         if (fp == NULL) {
 438                 syslog(LOG_ERR, "%s: %m", buf);
 439                 close(fdinfo);
 440                 nerr++;
 441                 goto closefd;
 442         }
 443         (void)umask(oumask);
 444
 445         info = fdopen(fdinfo, "w");
 446
 447         if (info == NULL) {
 448                 syslog(LOG_ERR, "fdopen failed: %m");
 449                 nerr++;
 450                 goto closefd;
 451         }
 452
 453         if (verbose)
 454                 printheader(stdout, &kdhl, device, bounds, status);
 455
 456         printheader(info, &kdhl, device, bounds, status);
 457         fclose(info);
 458
 459         syslog(LOG_NOTICE, "writing %score to %s",
 460             compress ? "compressed " : "", buf);
 461
 462         while (dumpsize > 0) {
 463                 wl = BUFFERSIZE;
 464                 if (wl > dumpsize)
 465                         wl = dumpsize;
 466                 nr = read(fd, buf, wl);
 467                 if (nr != wl) {
 468                         if (nr == 0)
 469                                 syslog(LOG_WARNING,
 470                                     "WARNING: EOF on dump device");
 471                         else
 472                                 syslog(LOG_ERR, "read error on %s: %m", device);
 473                         nerr++;
 474                         goto closeall;
 475                 }
 476                 if (compress) {
 477                         nw = fwrite(buf, 1, wl, fp);
 478                 } else {
 479                         for (nw = 0; nw < nr; nw = he) {
 480                                 /* find a contiguous block of zeroes */
 481                                 for (hs = nw; hs < nr; hs += BLOCKSIZE) {
 482                                         for (he = hs; he < nr && buf[he] == 0;
 483                                             ++he)
 484                                                 /* nothing */ ;
 485                                         /* is the hole long enough to matter? */
 486                                         if (he >= hs + BLOCKSIZE)
 487                                                 break;
 488                                 }
 489
 490                                 /* back down to a block boundary */
 491                                 he &= BLOCKMASK;
 492
 493                                 /*
 494                                  * 1) Don't go beyond the end of the buffer.
 495                                  * 2) If the end of the buffer is less than
 496                                  *    BLOCKSIZE bytes away, we're at the end
 497                                  *    of the file, so just grab what's left.
 498                                  */
 499                                 if (hs + BLOCKSIZE > nr)
 500                                         hs = he = nr;
 501
 502                                 /*
 503                                  * At this point, we have a partial ordering:
 504                                  *     nw <= hs <= he <= nr
 505                                  * If hs > nw, buf[nw..hs] contains non-zero data.
 506                                  * If he > hs, buf[hs..he] is all zeroes.
 507                                  */
 508                                 if (hs > nw)
 509                                         if (fwrite(buf + nw, hs - nw, 1, fp)
 510                                             != 1)
 511                                         break;
 512                                 if (he > hs)
 513                                         if (fseeko(fp, he - hs, SEEK_CUR) == -1)
 514                                                 break;
 515                         }
 516                 }
 517                 if (nw != wl) {
 518                         syslog(LOG_ERR,
 519                             "write error on vmcore.%d file: %m", bounds);
 520                         syslog(LOG_WARNING,
 521                             "WARNING: vmcore may be incomplete");
 522                         nerr++;
 523                         goto closeall;
 524                 }
 525                 if (verbose) {
 526                         dmpcnt += wl;
 527                         printf("%llu\r", (unsigned long long)dmpcnt);
 528                         fflush(stdout);
 529                 }
 530                 dumpsize -= wl;
 531         }
 532         if (verbose)
 533                 printf("\n");
 534
 535         if (fclose(fp) < 0) {
 536                 syslog(LOG_ERR, "error on vmcore.%d: %m", bounds);
 537                 nerr++;
 538                 goto closeall;
 539         }
 540         nsaved++;
 541
 542         if (verbose)
 543                 printf("dump saved\n");
 544
 545 nuke:
 546         if (clear || !keep) {
 547                 if (verbose)
 548                         printf("clearing dump header\n");
 549                 memcpy(kdhl.magic, KERNELDUMPMAGIC_CLEARED, sizeof kdhl.magic);
 550                 lseek(fd, lasthd, SEEK_SET);
 551                 error = write(fd, &kdhl, sizeof kdhl);
 552                 if (error != sizeof kdhl)
 553                         syslog(LOG_ERR,
 554                             "error while clearing the dump header: %m");
 555         }
 556         close(fd);
 557         return;
 558
 559 closeall:
 560         fclose(fp);
 561
 562 closefd:
 563         close(fd);
 564 }
 565
 566 static void
 567 usage(void)
 568 {
 569         fprintf(stderr, "%s\n%s\n%s\n",
 570             "usage: savecore -c",
 571             "       savecore -C [-v] [directory device]",
 572             "       savecore [-fkvz] [directory [device ...]]");
 573         exit (1);
 574 }
 575
 576 int
 577 main(int argc, char **argv)
 578 {
 579         const char *savedir = ".";
 580         struct fstab *fsp;
 581         int i, ch, error;
 582
 583         checkfor = compress = clear = force = keep = verbose = 0;
 584         nfound = nsaved = nerr = 0;
 585
 586         openlog("savecore", LOG_PERROR, LOG_DAEMON);
 587
 588         while ((ch = getopt(argc, argv, "Ccfkvz")) != -1)
 589                 switch(ch) {
 590                 case 'C':
 591                         checkfor = 1;
 592                         break;
 593                 case 'c':
 594                         clear = 1;
 595                         break;
 596                 case 'k':
 597                         keep = 1;
 598                         break;
 599                 case 'v':
 600                         verbose++;
 601                         break;
 602                 case 'f':
 603                         force = 1;
 604                         break;
 605                 case 'z':
 606                         compress = 1;
 607                         break;
 608                 case '?':
 609                 default:
 610                         usage();
 611                 }
 612         if (checkfor && (clear || force || keep))
 613                 usage();
 614         argc -= optind;
 615         argv += optind;
 616         if (argc >= 1) {
 617                 error = chdir(argv[0]);
 618                 if (error) {
 619                         syslog(LOG_ERR, "chdir(%s): %m", argv[0]);
 620                         exit(1);
 621                 }
 622                 savedir = argv[0];
 623                 argc--;
 624                 argv++;
 625         }
 626         if (argc == 0) {
 627                 for (;;) {
 628                         fsp = getfsent();
 629                         if (fsp == NULL)
 630                                 break;
 631                         if (strcmp(fsp->fs_vfstype, "swap") &&
 632                             strcmp(fsp->fs_vfstype, "dump"))
 633                                 continue;
 634                         DoFile(savedir, fsp->fs_spec);
 635                 }
 636         } else {
 637                 for (i = 0; i < argc; i++)
 638                         DoFile(savedir, argv[i]);
 639         }
 640
 641         /* Emit minimal output. */
 642         if (nfound == 0) {
 643                 if (checkfor) {
 644                         printf("No dump exists\n");
 645                         exit(1);
 646                 }
 647                 syslog(LOG_WARNING, "no dumps found");
 648         }
 649         else if (nsaved == 0) {
 650                 if (nerr != 0)
 651                         syslog(LOG_WARNING, "unsaved dumps found but not saved");
 652                 else
 653                         syslog(LOG_WARNING, "no unsaved dumps found");
 654         }
 655
 656         return (0);
 657 }