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         fclose(fp);
 157         return (ret);
 158 }
 159
 160 static void
 161 writebounds(int bounds) {
 162         FILE *fp;
 163
 164         if ((fp = fopen("bounds", "w")) == NULL) {
 165                 syslog(LOG_WARNING, "unable to write to bounds file: %m");
 166                 return;
 167         }
 168
 169         if (verbose)
 170                 printf("bounds number: %d\n", bounds);
 171
 172         fprintf(fp, "%d\n", bounds);
 173         fclose(fp);
 174 }
 175
 176 /*
 177  * Check that sufficient space is available on the disk that holds the
 178  * save directory.
 179  */
 180 static int
 181 check_space(const char *savedir, off_t dumpsize)
 182 {
 183         FILE *fp;
 184         off_t minfree, spacefree, totfree, needed;
 185         struct statfs fsbuf;
 186         char buf[100], path[MAXPATHLEN];
 187
 188         if (statfs(savedir, &fsbuf) < 0) {
 189                 syslog(LOG_ERR, "%s: %m", savedir);
 190                 exit(1);
 191         }
 192         spacefree = ((off_t) fsbuf.f_bavail * fsbuf.f_bsize) / 1024;
 193         totfree = ((off_t) fsbuf.f_bfree * fsbuf.f_bsize) / 1024;
 194
 195         (void)snprintf(path, sizeof(path), "%s/minfree", savedir);
 196         if ((fp = fopen(path, "r")) == NULL)
 197                 minfree = 0;
 198         else {
 199                 if (fgets(buf, sizeof(buf), fp) == NULL)
 200                         minfree = 0;
 201                 else
 202                         minfree = atoi(buf);
 203                 (void)fclose(fp);
 204         }
 205
 206         needed = dumpsize / 1024 + 2;   /* 2 for info file */
 207         if (((minfree > 0) ? spacefree : totfree) - needed < minfree) {
 208                 syslog(LOG_WARNING,
 209         "no dump, not enough free space on device (%lld available, need %lld)",
 210                     (long long)(minfree > 0 ? spacefree : totfree),
 211                     (long long)needed);
 212                 return (0);
 213         }
 214         if (spacefree - needed < 0)
 215                 syslog(LOG_WARNING,
 216                     "dump performed, but free space threshold crossed");
 217         return (1);
 218 }
 219
 220 #define BLOCKSIZE (1<<12)
 221 #define BLOCKMASK (~(BLOCKSIZE-1))
 222
 223 static void
 224 DoFile(const char *savedir, const char *device)
 225 {
 226         static char *buf = NULL;
 227         struct partinfo dpart;
 228         struct kerneldumpheader kdhf, kdhl;
 229         off_t mediasize, dumpsize, firsthd, lasthd, dmpcnt;
 230         FILE *info, *fp, *fpkern;
 231         mode_t oumask;
 232         int fd, fdinfo, fdkernin, error, wl;
 233         int nr, nw, hs, he = 0;
 234         int bounds, status;
 235         u_int sectorsize;
 236
 237         bounds = getbounds();
 238         dmpcnt = 0;
 239         mediasize = 0;
 240         status = STATUS_UNKNOWN;
 241
 242         if (buf == NULL) {
 243                 buf = malloc(BUFFERSIZE);
 244                 if (buf == NULL) {
 245                         syslog(LOG_ERR, "%m");
 246                         return;
 247                 }
 248         }
 249
 250         if (verbose)
 251                 printf("checking for kernel dump on device %s\n", device);
 252
 253         fd = open(device, O_RDWR);
 254         if (fd < 0) {
 255                 syslog(LOG_ERR, "%s: %m", device);
 256                 return;
 257         }
 258
 259         bzero(&dpart, sizeof(dpart));
 260         error = ioctl(fd, DIOCGPART, &dpart);
 261         if (error) {
 262                 syslog(LOG_ERR,
 263                     "couldn't find media and/or sector size of %s: %m", device);
 264                 goto closefd;
 265         }
 266         mediasize = dpart.media_size;
 267         sectorsize = dpart.media_blksize;
 268
 269         if (verbose) {
 270                 printf("mediasize = %lld\n", (long long)mediasize);
 271                 printf("sectorsize = %u\n", sectorsize);
 272         }
 273
 274         lasthd = mediasize - sectorsize;
 275         lseek(fd, lasthd, SEEK_SET);
 276         error = read(fd, &kdhl, sizeof kdhl);
 277         if (error != sizeof kdhl) {
 278                 syslog(LOG_ERR,
 279                     "error reading last dump header at offset %lld in %s: %m",
 280                     (long long)lasthd, device);
 281                 goto closefd;
 282         }
 283         if (memcmp(kdhl.magic, KERNELDUMPMAGIC, sizeof kdhl.magic)) {
 284                 if (verbose)
 285                         printf("magic mismatch on last dump header on %s\n",
 286                             device);
 287
 288                 status = STATUS_BAD;
 289                 if (force == 0)
 290                         goto closefd;
 291
 292                 if (memcmp(kdhl.magic, KERNELDUMPMAGIC_CLEARED,
 293                             sizeof kdhl.magic) == 0) {
 294                         if (verbose)
 295                                 printf("forcing magic on %s\n", device);
 296                         memcpy(kdhl.magic, KERNELDUMPMAGIC,
 297                             sizeof kdhl.magic);
 298                 } else {
 299                         syslog(LOG_ERR, "unable to force dump - bad magic");
 300                         goto closefd;
 301                 }
 302         }
 303         if (dtoh32(kdhl.version) != KERNELDUMPVERSION) {
 304                 syslog(LOG_ERR,
 305                     "unknown version (%d) in last dump header on %s",
 306                     dtoh32(kdhl.version), device);
 307
 308                 status = STATUS_BAD;
 309                 if (force == 0)
 310                         goto closefd;
 311         }
 312
 313         nfound++;
 314         if (clear)
 315                 goto nuke;
 316
 317         if (kerneldump_parity(&kdhl)) {
 318                 syslog(LOG_ERR,
 319                     "parity error on last dump header on %s", device);
 320                 nerr++;
 321                 status = STATUS_BAD;
 322                 if (force == 0)
 323                         goto closefd;
 324         }
 325         dumpsize = dtoh64(kdhl.dumplength);
 326         firsthd = lasthd - dumpsize - sizeof kdhf;
 327         lseek(fd, firsthd, SEEK_SET);
 328         error = read(fd, &kdhf, sizeof kdhf);
 329         if (error != sizeof kdhf) {
 330                 syslog(LOG_ERR,
 331                     "error reading first dump header at offset %lld in %s: %m",
 332                     (long long)firsthd, device);
 333                 nerr++;
 334                 goto closefd;
 335         }
 336
 337         if (verbose >= 2) {
 338                 printf("First dump headers:\n");
 339                 printheader(stdout, &kdhf, device, bounds, -1);
 340
 341                 printf("\nLast dump headers:\n");
 342                 printheader(stdout, &kdhl, device, bounds, -1);
 343                 printf("\n");
 344         }
 345
 346         if (memcmp(&kdhl, &kdhf, sizeof kdhl)) {
 347                 syslog(LOG_ERR,
 348                     "first and last dump headers disagree on %s", device);
 349                 nerr++;
 350                 status = STATUS_BAD;
 351                 if (force == 0)
 352                         goto closefd;
 353         } else {
 354                 status = STATUS_GOOD;
 355         }
 356
 357         if (checkfor) {
 358                 printf("A dump exists on %s\n", device);
 359                 close(fd);
 360                 exit(0);
 361         }
 362
 363         if (kdhl.panicstring[0])
 364                 syslog(LOG_ALERT, "reboot after panic: %s", kdhl.panicstring);
 365         else
 366                 syslog(LOG_ALERT, "reboot");
 367
 368         if (verbose)
 369                 printf("Checking for available free space\n");
 370         if (!check_space(savedir, dumpsize)) {
 371                 nerr++;
 372                 goto closefd;
 373         }
 374
 375         writebounds(bounds + 1);
 376
 377         /*
 378          * Write kernel file.
 379          */
 380         fdkernin = open(getbootfile(), O_RDONLY, 0);
 381         if (fdkernin < 0) {
 382                 syslog(LOG_ERR, "%s: %m", getbootfile());
 383         }
 384
 385         if (compress) {
 386                 sprintf(buf, "kern.%d.gz", bounds);
 387                 fpkern = zopen(buf, "w");
 388         } else {
 389                 sprintf(buf, "kern.%d", bounds);
 390                 fpkern = fopen(buf, "w");
 391         }
 392         if (fpkern == NULL) {
 393                 syslog(LOG_ERR, "%s: %m", buf);
 394                 close(fdkernin);
 395         }
 396
 397         syslog(LOG_NOTICE, "writing %skernel to %s",
 398             compress ? "compressed " : "", buf);
 399
 400         while ((nr = read(fdkernin, buf, BUFFERSIZE)) > 0) {
 401                 nw = fwrite(buf, 1, nr, fpkern);
 402                 if (nw != nr) {
 403                         syslog(LOG_ERR, "kern.%d: %m", bounds);
 404                         syslog(LOG_WARNING,
 405                             "WARNING: kernel may be incomplete");
 406                         exit(1);
 407                 }
 408         }
 409         if (nr < 0) {
 410                 syslog(LOG_ERR, "%s: %m", getbootfile());
 411                 syslog(LOG_WARNING,
 412                     "WARNING: kernel may be incomplete");
 413                 exit(1);
 414         }
 415         fclose(fpkern);
 416         close(fdkernin);
 417
 418
 419         sprintf(buf, "info.%d", bounds);
 420
 421         /*
 422          * Create or overwrite any existing dump header files.
 423          */
 424         fdinfo = open(buf, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 425         if (fdinfo < 0) {
 426                 syslog(LOG_ERR, "%s: %m", buf);
 427                 nerr++;
 428                 goto closefd;
 429         }
 430         oumask = umask(S_IRWXG|S_IRWXO); /* Restrict access to the core file.*/
 431         if (compress) {
 432                 sprintf(buf, "vmcore.%d.gz", bounds);
 433                 fp = zopen(buf, "w");
 434         } else {
 435                 sprintf(buf, "vmcore.%d", bounds);
 436                 fp = fopen(buf, "w");
 437         }
 438         if (fp == NULL) {
 439                 syslog(LOG_ERR, "%s: %m", buf);
 440                 close(fdinfo);
 441                 nerr++;
 442                 goto closefd;
 443         }
 444         (void)umask(oumask);
 445
 446         info = fdopen(fdinfo, "w");
 447
 448         if (info == NULL) {
 449                 syslog(LOG_ERR, "fdopen failed: %m");
 450                 nerr++;
 451                 goto closefd;
 452         }
 453
 454         if (verbose)
 455                 printheader(stdout, &kdhl, device, bounds, status);
 456
 457         printheader(info, &kdhl, device, bounds, status);
 458         fclose(info);
 459
 460         syslog(LOG_NOTICE, "writing %score to %s",
 461             compress ? "compressed " : "", buf);
 462
 463         while (dumpsize > 0) {
 464                 wl = BUFFERSIZE;
 465                 if (wl > dumpsize)
 466                         wl = dumpsize;
 467                 nr = read(fd, buf, wl);
 468                 if (nr != wl) {
 469                         if (nr == 0)
 470                                 syslog(LOG_WARNING,
 471                                     "WARNING: EOF on dump device");
 472                         else
 473                                 syslog(LOG_ERR, "read error on %s: %m", device);
 474                         nerr++;
 475                         goto closeall;
 476                 }
 477                 if (compress) {
 478                         nw = fwrite(buf, 1, wl, fp);
 479                 } else {
 480                         for (nw = 0; nw < nr; nw = he) {
 481                                 /* find a contiguous block of zeroes */
 482                                 for (hs = nw; hs < nr; hs += BLOCKSIZE) {
 483                                         for (he = hs; he < nr && buf[he] == 0;
 484                                             ++he)
 485                                                 /* nothing */ ;
 486                                         /* is the hole long enough to matter? */
 487                                         if (he >= hs + BLOCKSIZE)
 488                                                 break;
 489                                 }
 490
 491                                 /* back down to a block boundary */
 492                                 he &= BLOCKMASK;
 493
 494                                 /*
 495                                  * 1) Don't go beyond the end of the buffer.
 496                                  * 2) If the end of the buffer is less than
 497                                  *    BLOCKSIZE bytes away, we're at the end
 498                                  *    of the file, so just grab what's left.
 499                                  */
 500                                 if (hs + BLOCKSIZE > nr)
 501                                         hs = he = nr;
 502
 503                                 /*
 504                                  * At this point, we have a partial ordering:
 505                                  *     nw <= hs <= he <= nr
 506                                  * If hs > nw, buf[nw..hs] contains non-zero data.
 507                                  * If he > hs, buf[hs..he] is all zeroes.
 508                                  */
 509                                 if (hs > nw)
 510                                         if (fwrite(buf + nw, hs - nw, 1, fp)
 511                                             != 1)
 512                                         break;
 513                                 if (he > hs)
 514                                         if (fseeko(fp, he - hs, SEEK_CUR) == -1)
 515                                                 break;
 516                         }
 517                 }
 518                 if (nw != wl) {
 519                         syslog(LOG_ERR,
 520                             "write error on vmcore.%d file: %m", bounds);
 521                         syslog(LOG_WARNING,
 522                             "WARNING: vmcore may be incomplete");
 523                         nerr++;
 524                         goto closeall;
 525                 }
 526                 if (verbose) {
 527                         dmpcnt += wl;
 528                         printf("%llu\r", (unsigned long long)dmpcnt);
 529                         fflush(stdout);
 530                 }
 531                 dumpsize -= wl;
 532         }
 533         if (verbose)
 534                 printf("\n");
 535
 536         if (fclose(fp) < 0) {
 537                 syslog(LOG_ERR, "error on vmcore.%d: %m", bounds);
 538                 nerr++;
 539                 goto closeall;
 540         }
 541         nsaved++;
 542
 543         if (verbose)
 544                 printf("dump saved\n");
 545
 546 nuke:
 547         if (clear || !keep) {
 548                 if (verbose)
 549                         printf("clearing dump header\n");
 550                 memcpy(kdhl.magic, KERNELDUMPMAGIC_CLEARED, sizeof kdhl.magic);
 551                 lseek(fd, lasthd, SEEK_SET);
 552                 error = write(fd, &kdhl, sizeof kdhl);
 553                 if (error != sizeof kdhl)
 554                         syslog(LOG_ERR,
 555                             "error while clearing the dump header: %m");
 556         }
 557         close(fd);
 558         return;
 559
 560 closeall:
 561         fclose(fp);
 562
 563 closefd:
 564         close(fd);
 565 }
 566
 567 static void
 568 usage(void)
 569 {
 570         fprintf(stderr, "%s\n%s\n%s\n",
 571             "usage: savecore -c",
 572             "       savecore -C [-v] [directory device]",
 573             "       savecore [-fkvz] [directory [device ...]]");
 574         exit (1);
 575 }
 576
 577 int
 578 main(int argc, char **argv)
 579 {
 580         const char *savedir = ".";
 581         struct fstab *fsp;
 582         int i, ch, error;
 583
 584         checkfor = compress = clear = force = keep = verbose = 0;
 585         nfound = nsaved = nerr = 0;
 586
 587         openlog("savecore", LOG_PERROR, LOG_DAEMON);
 588
 589         while ((ch = getopt(argc, argv, "Ccfkvz")) != -1)
 590                 switch(ch) {
 591                 case 'C':
 592                         checkfor = 1;
 593                         break;
 594                 case 'c':
 595                         clear = 1;
 596                         break;
 597                 case 'k':
 598                         keep = 1;
 599                         break;
 600                 case 'v':
 601                         verbose++;
 602                         break;
 603                 case 'f':
 604                         force = 1;
 605                         break;
 606                 case 'z':
 607                         compress = 1;
 608                         break;
 609                 case '?':
 610                 default:
 611                         usage();
 612                 }
 613         if (checkfor && (clear || force || keep))
 614                 usage();
 615         argc -= optind;
 616         argv += optind;
 617         if (argc >= 1) {
 618                 error = chdir(argv[0]);
 619                 if (error) {
 620                         syslog(LOG_ERR, "chdir(%s): %m", argv[0]);
 621                         exit(1);
 622                 }
 623                 savedir = argv[0];
 624                 argc--;
 625                 argv++;
 626         }
 627         if (argc == 0) {
 628                 for (;;) {
 629                         fsp = getfsent();
 630                         if (fsp == NULL)
 631                                 break;
 632                         if (strcmp(fsp->fs_vfstype, "swap") &&
 633                             strcmp(fsp->fs_vfstype, "dump"))
 634                                 continue;
 635                         DoFile(savedir, fsp->fs_spec);
 636                 }
 637         } else {
 638                 for (i = 0; i < argc; i++)
 639                         DoFile(savedir, argv[i]);
 640         }
 641
 642         /* Emit minimal output. */
 643         if (nfound == 0) {
 644                 if (checkfor) {
 645                         printf("No dump exists\n");
 646                         exit(1);
 647                 }
 648                 syslog(LOG_WARNING, "no dumps found");
 649         }
 650         else if (nsaved == 0) {
 651                 if (nerr != 0)
 652                         syslog(LOG_WARNING, "unsaved dumps found but not saved");
 653                 else
 654                         syslog(LOG_WARNING, "no unsaved dumps found");
 655         }
 656
 657         return (0);
 658 }