bin/df/df.c

   1 /*
   2  * Copyright (c) 1980, 1990, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * (c) UNIX System Laboratories, Inc.
   5  * All or some portions of this file are derived from material licensed
   6  * to the University of California by American Telephone and Telegraph
   7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   8  * the permission of UNIX System Laboratories, Inc.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  * @(#) Copyright (c) 1980, 1990, 1993, 1994 The Regents of the University of California.  All rights reserved.
  39  * @(#)df.c     8.9 (Berkeley) 5/8/95
  40  * $FreeBSD: src/bin/df/df.c,v 1.23.2.9 2002/07/01 00:14:24 iedowse Exp $
  41  * $DragonFly: src/bin/df/df.c,v 1.10 2008/06/01 20:52:21 dillon Exp $
  42  */
  43
  44 #include <sys/cdefs.h>
  45 #include <sys/param.h>
  46 #include <sys/stat.h>
  47 #include <sys/mount.h>
  48 #include <sys/sysctl.h>
  49 #include <sys/statvfs.h>
  50
  51 #include <vfs/ufs/dinode.h>
  52 #include <vfs/ufs/fs.h>
  53 #include <vfs/ufs/ufsmount.h>
  54
  55 #include <err.h>
  56 #include <errno.h>
  57 #include <fcntl.h>
  58 #include <fstab.h>
  59 #include <math.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63 #include <sysexits.h>
  64 #include <unistd.h>
  65
  66 #define UNITS_SI 1
  67 #define UNITS_2 2
  68
  69 #define KILO_SZ(n) (n)
  70 #define MEGA_SZ(n) ((n) * (n))
  71 #define GIGA_SZ(n) ((n) * (n) * (n))
  72 #define TERA_SZ(n) ((n) * (n) * (n) * (n))
  73 #define PETA_SZ(n) ((n) * (n) * (n) * (n) * (n))
  74
  75 #define KILO_2_SZ (KILO_SZ(1024ULL))
  76 #define MEGA_2_SZ (MEGA_SZ(1024ULL))
  77 #define GIGA_2_SZ (GIGA_SZ(1024ULL))
  78 #define TERA_2_SZ (TERA_SZ(1024ULL))
  79 #define PETA_2_SZ (PETA_SZ(1024ULL))
  80
  81 #define KILO_SI_SZ (KILO_SZ(1000ULL))
  82 #define MEGA_SI_SZ (MEGA_SZ(1000ULL))
  83 #define GIGA_SI_SZ (GIGA_SZ(1000ULL))
  84 #define TERA_SI_SZ (TERA_SZ(1000ULL))
  85 #define PETA_SI_SZ (PETA_SZ(1000ULL))
  86
  87 /* Maximum widths of various fields. */
  88 struct maxwidths {
  89         int mntfrom;
  90         int total;
  91         int used;
  92         int avail;
  93         int iused;
  94         int ifree;
  95 };
  96
  97 unsigned long long vals_si [] = {1, KILO_SI_SZ, MEGA_SI_SZ, GIGA_SI_SZ, TERA_SI_SZ, PETA_SI_SZ};
  98 unsigned long long vals_base2[] = {1, KILO_2_SZ, MEGA_2_SZ, GIGA_2_SZ, TERA_2_SZ, PETA_2_SZ};
  99 unsigned long long *valp;
 100
 101 typedef enum { NONE, KILO, MEGA, GIGA, TERA, PETA, UNIT_MAX } unit_t;
 102
 103 unit_t unitp [] = { NONE, KILO, MEGA, GIGA, TERA, PETA };
 104
 105 int       bread(off_t, void *, int);
 106 int       checkvfsname(const char *, char **);
 107 char     *getmntpt(char *);
 108 int       quadwidth(int64_t);
 109 char     *makenetvfslist(void);
 110 char    **makevfslist(char *);
 111 void      prthuman(struct statvfs *, long);
 112 void      prthumanval(double);
 113 void      prtstat(struct statfs *, struct statvfs *, struct maxwidths *);
 114 long      regetmntinfo(struct statfs **, struct statvfs **,  long, char **);
 115 int       ufs_df(char *, struct maxwidths *);
 116 unit_t    unit_adjust(double *);
 117 void      update_maxwidths(struct maxwidths *, struct statfs *, struct statvfs *);
 118 void      usage(void);
 119
 120 int     aflag = 0, hflag, iflag, nflag;
 121 struct  ufs_args mdev;
 122
 123 static __inline int
 124 imax(int a, int b)
 125 {
 126         return (a > b ? a : b);
 127 }
 128
 129 static __inline int64_t
 130 qmax(int64_t a, int64_t b)
 131 {
 132         return (a > b ? a : b);
 133 }
 134
 135 int
 136 main(int argc, char **argv)
 137 {
 138         struct stat stbuf;
 139         struct statfs statfsbuf, *mntbuf;
 140         struct statvfs statvfsbuf, *mntvbuf;
 141         struct maxwidths maxwidths;
 142         const char *fstype;
 143         char *mntpath, *mntpt, **vfslist;
 144         long mntsize;
 145         int ch, i, rv;
 146
 147         fstype = "ufs";
 148
 149         vfslist = NULL;
 150         while ((ch = getopt(argc, argv, "abgHhiklmnPt:")) != -1)
 151                 switch (ch) {
 152                 case 'a':
 153                         aflag = 1;
 154                         break;
 155                 case 'b':
 156                                 /* FALLTHROUGH */
 157                 case 'P':
 158                         if (putenv("BLOCKSIZE=512") != 0)
 159                                 warn("putenv: cannot set BLOCKSIZE=512");
 160                         hflag = 0;
 161                         break;
 162                 case 'g':
 163                         if (putenv("BLOCKSIZE=1g") != 0)
 164                                 warn("putenv: cannot set BLOCKSIZE=1g");
 165                         hflag = 0;
 166                         break;
 167                 case 'H':
 168                         hflag = UNITS_SI;
 169                         valp = vals_si;
 170                         break;
 171                 case 'h':
 172                         hflag = UNITS_2;
 173                         valp = vals_base2;
 174                         break;
 175                 case 'i':
 176                         iflag = 1;
 177                         break;
 178                 case 'k':
 179                         if (putenv("BLOCKSIZE=1k") != 0)
 180                                 warn("putenv: cannot set BLOCKSIZE=1k");
 181                         hflag = 0;
 182                         break;
 183                 case 'l':
 184                         if (vfslist != NULL)
 185                                 errx(1, "-l and -t are mutually exclusive.");
 186                         vfslist = makevfslist(makenetvfslist());
 187                         break;
 188                 case 'm':
 189                         if (putenv("BLOCKSIZE=1m") != 0)
 190                                 warn("putenv: cannot set BLOCKSIZE=1m");
 191                         hflag = 0;
 192                         break;
 193                 case 'n':
 194                         nflag = 1;
 195                         break;
 196                 case 't':
 197                         if (vfslist != NULL)
 198                                 errx(1, "only one -t option may be specified");
 199                         fstype = optarg;
 200                         vfslist = makevfslist(optarg);
 201                         break;
 202                 case '?':
 203                 default:
 204                         usage();
 205                 }
 206         argc -= optind;
 207         argv += optind;
 208
 209         mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT);
 210         bzero(&maxwidths, sizeof(maxwidths));
 211         for (i = 0; i < mntsize; i++)
 212                 update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]);
 213
 214         rv = 0;
 215         if (!*argv) {
 216                 mntsize = regetmntinfo(&mntbuf, &mntvbuf, mntsize, vfslist);
 217                 bzero(&maxwidths, sizeof(maxwidths));
 218                 for (i = 0; i < mntsize; i++)
 219                         update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]);
 220                 for (i = 0; i < mntsize; i++) {
 221                         if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0)
 222                                 prtstat(&mntbuf[i], &mntvbuf[i], &maxwidths);
 223                 }
 224                 exit(rv);
 225         }
 226
 227         for (; *argv; argv++) {
 228                 if (stat(*argv, &stbuf) < 0) {
 229                         if ((mntpt = getmntpt(*argv)) == 0) {
 230                                 warn("%s", *argv);
 231                                 rv = 1;
 232                                 continue;
 233                         }
 234                 } else if (S_ISCHR(stbuf.st_mode)) {
 235                         if ((mntpt = getmntpt(*argv)) == 0) {
 236                                 mdev.fspec = *argv;
 237                                 mntpath = strdup("/tmp/df.XXXXXX");
 238                                 if (mntpath == NULL) {
 239                                         warn("strdup failed");
 240                                         rv = 1;
 241                                         continue;
 242                                 }
 243                                 mntpt = mkdtemp(mntpath);
 244                                 if (mntpt == NULL) {
 245                                         warn("mkdtemp(\"%s\") failed", mntpath);
 246                                         rv = 1;
 247                                         free(mntpath);
 248                                         continue;
 249                                 }
 250                                 if (mount(fstype, mntpt, MNT_RDONLY,
 251                                     &mdev) != 0) {
 252                                         rv = ufs_df(*argv, &maxwidths) || rv;
 253                                         rmdir(mntpt);
 254                                         free(mntpath);
 255                                         continue;
 256                                 } else if (statfs(mntpt, &statfsbuf) == 0 &&
 257                                            statvfs(mntpt, &statvfsbuf) == 0) {
 258                                         statfsbuf.f_mntonname[0] = '\0';
 259                                         prtstat(&statfsbuf, &statvfsbuf, &maxwidths);
 260                                 } else {
 261                                         warn("%s", *argv);
 262                                         rv = 1;
 263                                 }
 264                                 unmount(mntpt, 0);
 265                                 rmdir(mntpt);
 266                                 free(mntpath);
 267                                 continue;
 268                         }
 269                 } else
 270                         mntpt = *argv;
 271                 /*
 272                  * Statfs does not take a `wait' flag, so we cannot
 273                  * implement nflag here.
 274                  */
 275                 if (statfs(mntpt, &statfsbuf) < 0) {
 276                         warn("%s", mntpt);
 277                         rv = 1;
 278                         continue;
 279                 }
 280                 if (statvfs(mntpt, &statvfsbuf) < 0) {
 281                         warn("%s", mntpt);
 282                         rv = 1;
 283                         continue;
 284                 }
 285                 if (argc == 1) {
 286                         bzero(&maxwidths, sizeof(maxwidths));
 287                         update_maxwidths(&maxwidths, &statfsbuf, &statvfsbuf);
 288                 }
 289                 prtstat(&statfsbuf, &statvfsbuf, &maxwidths);
 290         }
 291         return (rv);
 292 }
 293
 294 char *
 295 getmntpt(char *name)
 296 {
 297         long mntsize, i;
 298         struct statfs *mntbuf;
 299         struct statvfs *mntvbuf;
 300
 301         mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT);
 302         for (i = 0; i < mntsize; i++) {
 303                 if (!strcmp(mntbuf[i].f_mntfromname, name))
 304                         return (mntbuf[i].f_mntonname);
 305         }
 306         return (0);
 307 }
 308
 309 /*
 310  * Make a pass over the filesystem info in ``mntbuf'' filtering out
 311  * filesystem types not in vfslist and possibly re-stating to get
 312  * current (not cached) info.  Returns the new count of valid statfs bufs.
 313  */
 314 long
 315 regetmntinfo(struct statfs **mntbufp, struct statvfs **mntvbufp, long mntsize, char **vfslist)
 316 {
 317         int i, j;
 318         struct statfs *mntbuf;
 319         struct statvfs *mntvbuf;
 320
 321         if (vfslist == NULL)
 322                 return (nflag ? mntsize : getmntvinfo(mntbufp, mntvbufp, MNT_WAIT));
 323
 324         mntbuf = *mntbufp;
 325         mntvbuf = *mntvbufp;
 326         for (j = 0, i = 0; i < mntsize; i++) {
 327                 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
 328                         continue;
 329                 if (!nflag) {
 330                         statfs(mntbuf[i].f_mntonname,&mntbuf[j]);
 331                         statvfs(mntbuf[i].f_mntonname,&mntvbuf[j]);
 332                 } else if (i != j) {
 333                         mntbuf[j] = mntbuf[i];
 334                         mntvbuf[j] = mntvbuf[i];
 335                 }
 336                 j++;
 337         }
 338         return (j);
 339 }
 340
 341 /*
 342  * Output in "human-readable" format.  Uses 3 digits max and puts
 343  * unit suffixes at the end.  Makes output compact and easy to read,
 344  * especially on huge disks.
 345  *
 346  */
 347 unit_t
 348 unit_adjust(double *val)
 349 {
 350         double abval;
 351         unit_t unit;
 352         unsigned int unit_sz;
 353
 354         abval = fabs(*val);
 355
 356         unit_sz = abval ? ilogb(abval) / 10 : 0;
 357
 358         if (unit_sz >= UNIT_MAX) {
 359                 unit = NONE;
 360         } else {
 361                 unit = unitp[unit_sz];
 362                 *val /= (double)valp[unit_sz];
 363         }
 364
 365         return (unit);
 366 }
 367
 368 void
 369 prthuman(struct statvfs *vsfsp, long used)
 370 {
 371         prthumanval((double)vsfsp->f_blocks * (double)vsfsp->f_bsize);
 372         prthumanval((double)used * (double)vsfsp->f_bsize);
 373         prthumanval((double)vsfsp->f_bavail * (double)vsfsp->f_bsize);
 374 }
 375
 376 void
 377 prthumanval(double bytes)
 378 {
 379
 380         unit_t unit;
 381         unit = unit_adjust(&bytes);
 382
 383         if (bytes == 0)
 384                 printf("     0B");
 385         else if (bytes > 10)
 386                 printf(" %5.0f%c", bytes, "BKMGTPE"[unit]);
 387         else
 388                 printf(" %5.1f%c", bytes, "BKMGTPE"[unit]);
 389 }
 390
 391 /*
 392  * Convert statfs returned filesystem size into BLOCKSIZE units.
 393  * Attempts to avoid overflow for large filesystems.
 394  */
 395 static
 396 int64_t
 397 fsbtoblk(int64_t num, long bsize, long reqbsize)
 398 {
 399         if (bsize && bsize < reqbsize)
 400                 num = num / (reqbsize / bsize);
 401         else
 402                 num = num * (bsize / reqbsize);
 403         return(num);
 404 }
 405
 406 /*
 407  * Print out status about a filesystem.
 408  */
 409 void
 410 prtstat(struct statfs *sfsp, struct statvfs *vsfsp, struct maxwidths *mwp)
 411 {
 412         static long blocksize;
 413         static int headerlen, timesthrough;
 414         static const char *header;
 415         int64_t used, availblks, inodes;
 416
 417         if (++timesthrough == 1) {
 418                 mwp->mntfrom = imax(mwp->mntfrom, strlen("Filesystem"));
 419                 if (hflag) {
 420                         header = "  Size";
 421                         mwp->total = mwp->used = mwp->avail = strlen(header);
 422                 } else {
 423                         header = getbsize(&headerlen, &blocksize);
 424                         mwp->total = imax(mwp->total, headerlen);
 425                 }
 426                 mwp->used = imax(mwp->used, strlen("Used"));
 427                 mwp->avail = imax(mwp->avail, strlen("Avail"));
 428
 429                 printf("%-*s %-*s %*s %*s Capacity", mwp->mntfrom,
 430                     "Filesystem", mwp->total, header, mwp->used, "Used",
 431                     mwp->avail, "Avail");
 432                 if (iflag) {
 433                         mwp->iused = imax(mwp->iused, strlen("  iused"));
 434                         mwp->ifree = imax(mwp->ifree, strlen("ifree"));
 435                         printf(" %*s %*s %%iused", mwp->iused - 2,
 436                             "iused", mwp->ifree, "ifree");
 437                 }
 438                 printf("  Mounted on\n");
 439         }
 440         printf("%-*s", mwp->mntfrom, sfsp->f_mntfromname);
 441         used = vsfsp->f_blocks - vsfsp->f_bfree;
 442         availblks = vsfsp->f_bavail + used;
 443         if (hflag) {
 444                 prthuman(vsfsp, used);
 445         } else {
 446                 printf(" %*lld %*lld %*lld", mwp->total,
 447                     fsbtoblk(vsfsp->f_blocks, vsfsp->f_bsize, blocksize),
 448                     mwp->used, fsbtoblk(used, vsfsp->f_bsize, blocksize),
 449                     mwp->avail, fsbtoblk(vsfsp->f_bavail, vsfsp->f_bsize,
 450                     blocksize));
 451         }
 452         printf(" %5.0f%%",
 453             availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
 454         if (iflag) {
 455                 inodes = vsfsp->f_files;
 456                 used = inodes - vsfsp->f_ffree;
 457                 printf(" %*lld %*lld %4.0f%% ", mwp->iused, used,
 458                     mwp->ifree, (int64_t)vsfsp->f_ffree, inodes == 0 ? 100.0 :
 459                     (double)used / (double)inodes * 100.0);
 460         } else
 461                 printf("  ");
 462         printf("  %s\n", sfsp->f_mntonname);
 463 }
 464
 465 /*
 466  * Update the maximum field-width information in `mwp' based on
 467  * the filesystem specified by `sfsp'.
 468  */
 469 void
 470 update_maxwidths(struct maxwidths *mwp, struct statfs *sfsp, struct statvfs *vsfsp)
 471 {
 472         static long blocksize;
 473         int dummy;
 474
 475         if (blocksize == 0)
 476                 getbsize(&dummy, &blocksize);
 477
 478         mwp->mntfrom = imax(mwp->mntfrom, strlen(sfsp->f_mntfromname));
 479         mwp->total = imax(mwp->total, quadwidth(fsbtoblk(vsfsp->f_blocks,
 480             vsfsp->f_bsize, blocksize)));
 481         mwp->used = imax(mwp->used, quadwidth(fsbtoblk(vsfsp->f_blocks -
 482             vsfsp->f_bfree, vsfsp->f_bsize, blocksize)));
 483         mwp->avail = imax(mwp->avail, quadwidth(fsbtoblk(vsfsp->f_bavail,
 484             vsfsp->f_bsize, blocksize)));
 485         mwp->iused = imax(mwp->iused, quadwidth(vsfsp->f_files -
 486             vsfsp->f_ffree));
 487         mwp->ifree = imax(mwp->ifree, quadwidth(vsfsp->f_ffree));
 488 }
 489
 490 /* Return the width in characters of the specified long. */
 491 int
 492 quadwidth(int64_t val)
 493 {
 494         int len;
 495
 496         len = 0;
 497         /* Negative or zero values require one extra digit. */
 498         if (val <= 0) {
 499                 val = -val;
 500                 len++;
 501         }
 502         while (val > 0) {
 503                 len++;
 504                 val /= 10;
 505         }
 506         return (len);
 507 }
 508
 509 /*
 510  * This code constitutes the pre-system call Berkeley df code for extracting
 511  * information from filesystem superblocks.
 512  */
 513
 514 union {
 515         struct fs iu_fs;
 516         char dummy[SBSIZE];
 517 } sb;
 518 #define sblock sb.iu_fs
 519
 520 int     rfd;
 521
 522 int
 523 ufs_df(char *file, struct maxwidths *mwp)
 524 {
 525         struct statfs statfsbuf;
 526         struct statvfs statvfsbuf;
 527         struct statfs *sfsp;
 528         struct statvfs *vsfsp;
 529         const char *mntpt;
 530         static int synced;
 531
 532         if (synced++ == 0)
 533                 sync();
 534
 535         if ((rfd = open(file, O_RDONLY)) < 0) {
 536                 warn("%s", file);
 537                 return (1);
 538         }
 539         if (bread((off_t)SBOFF, &sblock, SBSIZE) == 0) {
 540                 close(rfd);
 541                 return (1);
 542         }
 543         sfsp = &statfsbuf;
 544         vsfsp = &statvfsbuf;
 545         sfsp->f_type = 1;
 546         strcpy(sfsp->f_fstypename, "ufs");
 547         sfsp->f_flags = 0;
 548         sfsp->f_bsize = vsfsp->f_bsize = sblock.fs_fsize;
 549         sfsp->f_iosize = vsfsp->f_frsize = sblock.fs_bsize;
 550         sfsp->f_blocks = vsfsp->f_blocks = sblock.fs_dsize;
 551         sfsp->f_bfree = vsfsp->f_bfree =
 552                 sblock.fs_cstotal.cs_nbfree * sblock.fs_frag +
 553                 sblock.fs_cstotal.cs_nffree;
 554         sfsp->f_bavail = vsfsp->f_bavail = freespace(&sblock, sblock.fs_minfree);
 555         sfsp->f_files = vsfsp->f_files = sblock.fs_ncg * sblock.fs_ipg;
 556         sfsp->f_ffree = vsfsp->f_ffree = sblock.fs_cstotal.cs_nifree;
 557         sfsp->f_fsid.val[0] = 0;
 558         sfsp->f_fsid.val[1] = 0;
 559         if ((mntpt = getmntpt(file)) == 0)
 560                 mntpt = "";
 561         memmove(&sfsp->f_mntonname[0], mntpt, (size_t)MNAMELEN);
 562         memmove(&sfsp->f_mntfromname[0], file, (size_t)MNAMELEN);
 563         prtstat(sfsp, vsfsp, mwp);
 564         close(rfd);
 565         return (0);
 566 }
 567
 568 int
 569 bread(off_t off, void *buf, int cnt)
 570 {
 571         ssize_t nr;
 572
 573         lseek(rfd, off, SEEK_SET);
 574         if ((nr = read(rfd, buf, (size_t)cnt)) != (ssize_t)cnt) {
 575                 /* Probably a dismounted disk if errno == EIO. */
 576                 if (errno != EIO)
 577                         fprintf(stderr, "\ndf: %lld: %s\n",
 578                             (long long)off, strerror(nr > 0 ? EIO : errno));
 579                 return (0);
 580         }
 581         return (1);
 582 }
 583
 584 void
 585 usage(void)
 586 {
 587
 588         fprintf(stderr,
 589             "usage: df [-b | -H | -h | -k | -m | -P] [-ailn] [-t type] [file | filesystem ...]\n");
 590         exit(EX_USAGE);
 591 }
 592
 593 char *
 594 makenetvfslist(void)
 595 {
 596         char *str, *strptr, **listptr;
 597         int mib[3], maxvfsconf, cnt=0, i;
 598         size_t miblen;
 599         struct ovfsconf *ptr;
 600
 601         mib[0] = CTL_VFS; mib[1] = VFS_GENERIC; mib[2] = VFS_MAXTYPENUM;
 602         miblen=sizeof(maxvfsconf);
 603         if (sysctl(mib, (unsigned int)(sizeof(mib) / sizeof(mib[0])),
 604             &maxvfsconf, &miblen, NULL, 0)) {
 605                 warnx("sysctl failed");
 606                 return (NULL);
 607         }
 608
 609         if ((listptr = malloc(sizeof(char*) * maxvfsconf)) == NULL) {
 610                 warnx("malloc failed");
 611                 return (NULL);
 612         }
 613
 614         for (ptr = getvfsent(); ptr; ptr = getvfsent())
 615                 if (ptr->vfc_flags & VFCF_NETWORK) {
 616                         listptr[cnt++] = strdup(ptr->vfc_name);
 617                         if (listptr[cnt-1] == NULL) {
 618                                 warnx("malloc failed");
 619                                 return (NULL);
 620                         }
 621                 }
 622
 623         if (cnt == 0 ||
 624             (str = malloc(sizeof(char) * (32 * cnt + cnt + 2))) == NULL) {
 625                 if (cnt > 0)
 626                         warnx("malloc failed");
 627                 free(listptr);
 628                 return (NULL);
 629         }
 630
 631         *str = 'n'; *(str + 1) = 'o';
 632         for (i = 0, strptr = str + 2; i < cnt; i++, strptr++) {
 633                 strncpy(strptr, listptr[i], 32);
 634                 strptr += strlen(listptr[i]);
 635                 *strptr = ',';
 636                 free(listptr[i]);
 637         }
 638         *(--strptr) = '\0';
 639
 640         free(listptr);
 641         return (str);
 642 }