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
  39 #ifndef lint
  40 static const char copyright[] =
  41 "@(#) Copyright (c) 1980, 1990, 1993, 1994\n\
  42         The Regents of the University of California.  All rights reserved.\n";
  43 #endif /* not lint */
  44
  45 #ifndef lint
  46 #if 0
  47 static char sccsid[] = "@(#)df.c        8.9 (Berkeley) 5/8/95";
  48 #else
  49 static const char rcsid[] =
  50   "$FreeBSD: src/bin/df/df.c,v 1.23.2.9 2002/07/01 00:14:24 iedowse Exp $";
  51 #endif
  52 #endif /* not lint */
  53
  54 #ifdef __APPLE__
  55 #define MNT_IGNORE 0
  56 #include <sys/types.h>
  57 typedef int32_t ufs_daddr_t;
  58 #endif
  59
  60 #include <sys/cdefs.h>
  61 #include <sys/param.h>
  62 #include <sys/stat.h>
  63 #include <sys/mount.h>
  64 #include <sys/sysctl.h>
  65 #include <ufs/ufs/ufsmount.h>
  66 #include <ufs/ffs/fs.h>
  67
  68 #include <err.h>
  69 #include <errno.h>
  70 #include <fcntl.h>
  71 #include <fstab.h>
  72 #include <math.h>
  73 #include <stdio.h>
  74 #include <stdlib.h>
  75 #include <string.h>
  76 #include <sysexits.h>
  77 #include <unistd.h>
  78
  79 #define UNITS_SI 1
  80 #define UNITS_2 2
  81
  82 #define KILO_SZ(n) (n)
  83 #define MEGA_SZ(n) ((n) * (n))
  84 #define GIGA_SZ(n) ((n) * (n) * (n))
  85 #define TERA_SZ(n) ((n) * (n) * (n) * (n))
  86 #define PETA_SZ(n) ((n) * (n) * (n) * (n) * (n))
  87
  88 #define KILO_2_SZ (KILO_SZ(1024ULL))
  89 #define MEGA_2_SZ (MEGA_SZ(1024ULL))
  90 #define GIGA_2_SZ (GIGA_SZ(1024ULL))
  91 #define TERA_2_SZ (TERA_SZ(1024ULL))
  92 #define PETA_2_SZ (PETA_SZ(1024ULL))
  93
  94 #define KILO_SI_SZ (KILO_SZ(1000ULL))
  95 #define MEGA_SI_SZ (MEGA_SZ(1000ULL))
  96 #define GIGA_SI_SZ (GIGA_SZ(1000ULL))
  97 #define TERA_SI_SZ (TERA_SZ(1000ULL))
  98 #define PETA_SI_SZ (PETA_SZ(1000ULL))
  99
 100 /* Maximum widths of various fields. */
 101 struct maxwidths {
 102         int mntfrom;
 103         int total;
 104         int used;
 105         int avail;
 106         int iused;
 107         int ifree;
 108 };
 109
 110 unsigned long long vals_si [] = {1, KILO_SI_SZ, MEGA_SI_SZ, GIGA_SI_SZ, TERA_SI_SZ, PETA_SI_SZ};
 111 unsigned long long vals_base2[] = {1, KILO_2_SZ, MEGA_2_SZ, GIGA_2_SZ, TERA_2_SZ, PETA_2_SZ};
 112 unsigned long long *valp;
 113
 114 typedef enum { NONE, KILO, MEGA, GIGA, TERA, PETA, UNIT_MAX } unit_t;
 115
 116 unit_t unitp [] = { NONE, KILO, MEGA, GIGA, TERA, PETA };
 117
 118 int       bread(off_t, void *, int);
 119 int       checkvfsname(const char *, char **);
 120 char     *getmntpt(char *);
 121 int       longwidth(long long);
 122 char     *makenetvfslist(void);
 123 char    **makevfslist(char *);
 124 void      prthuman(struct statfs *, long);
 125 void      prthumanval(double);
 126 void      prtstat(struct statfs *, struct maxwidths *);
 127 long      regetmntinfo(struct statfs **, long, char **);
 128 int       ufs_df(char *, struct maxwidths *);
 129 unit_t    unit_adjust(double *);
 130 void      update_maxwidths(struct maxwidths *, struct statfs *);
 131 void      usage(void);
 132
 133 int     aflag = 0, hflag, iflag, nflag;
 134 struct  ufs_args mdev;
 135
 136 static __inline int imax(int a, int b)
 137 {
 138         return (a > b ? a : b);
 139 }
 140
 141 int
 142 main(int argc, char *argv[])
 143 {
 144         struct stat stbuf;
 145         struct statfs statfsbuf, *mntbuf;
 146         struct maxwidths maxwidths;
 147         const char *fstype;
 148         char *mntpath, *mntpt, **vfslist;
 149         long mntsize;
 150         int ch, i, rv, tflag = 0;
 151
 152         fstype = "ufs";
 153
 154         vfslist = NULL;
 155         while ((ch = getopt(argc, argv, "abgHhiklmnPt:")) != -1)
 156                 switch (ch) {
 157                 case 'a':
 158                         aflag = 1;
 159                         break;
 160                 case 'b':
 161                                 /* FALLTHROUGH */
 162                 case 'P':
 163                         putenv("BLOCKSIZE=512");
 164                         hflag = 0;
 165                         break;
 166                 case 'g':
 167                         putenv("BLOCKSIZE=1g");
 168                         hflag = 0;
 169                         break;
 170                 case 'H':
 171                         hflag = UNITS_SI;
 172                         valp = vals_si;
 173                         break;
 174                 case 'h':
 175                         hflag = UNITS_2;
 176                         valp = vals_base2;
 177                         break;
 178                 case 'i':
 179                         iflag = 1;
 180                         break;
 181                 case 'k':
 182                         putenv("BLOCKSIZE=1k");
 183                         hflag = 0;
 184                         break;
 185                 case 'l':
 186                         if (tflag)
 187                                 errx(1, "-l and -t are mutually exclusive.");
 188                         if (vfslist != NULL)
 189                                 break;
 190                         vfslist = makevfslist(makenetvfslist());
 191                         break;
 192                 case 'm':
 193                         putenv("BLOCKSIZE=1m");
 194                         hflag = 0;
 195                         break;
 196                 case 'n':
 197                         nflag = 1;
 198                         break;
 199                 case 't':
 200                         if (vfslist != NULL) {
 201                                 if (tflag)
 202                                         errx(1, "only one -t option may be specified");
 203                                 else
 204                                         errx(1, "-l and -t are mutually exclusive.");
 205                         }
 206                         tflag++;
 207                         fstype = optarg;
 208                         vfslist = makevfslist(optarg);
 209                         break;
 210                 case '?':
 211                 default:
 212                         usage();
 213                 }
 214         argc -= optind;
 215         argv += optind;
 216
 217         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 218         bzero(&maxwidths, sizeof(maxwidths));
 219         for (i = 0; i < mntsize; i++)
 220                 update_maxwidths(&maxwidths, &mntbuf[i]);
 221
 222         rv = 0;
 223         if (!*argv) {
 224                 mntsize = regetmntinfo(&mntbuf, mntsize, vfslist);
 225                 bzero(&maxwidths, sizeof(maxwidths));
 226                 for (i = 0; i < mntsize; i++)
 227                         update_maxwidths(&maxwidths, &mntbuf[i]);
 228                 for (i = 0; i < mntsize; i++) {
 229                         if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0)
 230                                 prtstat(&mntbuf[i], &maxwidths);
 231                 }
 232                 exit(rv);
 233         }
 234
 235         for (; *argv; argv++) {
 236                 if (stat(*argv, &stbuf) < 0) {
 237                         if ((mntpt = getmntpt(*argv)) == 0) {
 238                                 warn("%s", *argv);
 239                                 rv = 1;
 240                                 continue;
 241                         }
 242                 } else if (S_ISCHR(stbuf.st_mode)) {
 243                         if ((mntpt = getmntpt(*argv)) == 0) {
 244                                 mdev.fspec = *argv;
 245                                 mntpath = strdup("/tmp/df.XXXXXX");
 246                                 if (mntpath == NULL) {
 247                                         warn("strdup failed");
 248                                         rv = 1;
 249                                         continue;
 250                                 }
 251                                 mntpt = mkdtemp(mntpath);
 252                                 if (mntpt == NULL) {
 253                                         warn("mkdtemp(\"%s\") failed", mntpath);
 254                                         rv = 1;
 255                                         free(mntpath);
 256                                         continue;
 257                                 }
 258                                 if (mount(fstype, mntpt, MNT_RDONLY,
 259                                     &mdev) != 0) {
 260                                         rv = ufs_df(*argv, &maxwidths) || rv;
 261                                         (void)rmdir(mntpt);
 262                                         free(mntpath);
 263                                         continue;
 264                                 } else if (statfs(mntpt, &statfsbuf) == 0) {
 265                                         statfsbuf.f_mntonname[0] = '\0';
 266                                         prtstat(&statfsbuf, &maxwidths);
 267                                 } else {
 268                                         warn("%s", *argv);
 269                                         rv = 1;
 270                                 }
 271                                 (void)unmount(mntpt, 0);
 272                                 (void)rmdir(mntpt);
 273                                 free(mntpath);
 274                                 continue;
 275                         }
 276                 } else
 277                         mntpt = *argv;
 278                 /*
 279                  * Statfs does not take a `wait' flag, so we cannot
 280                  * implement nflag here.
 281                  */
 282                 if (statfs(mntpt, &statfsbuf) < 0) {
 283                         warn("%s", mntpt);
 284                         rv = 1;
 285                         continue;
 286                 }
 287                 /* Check to make sure the arguments we've been
 288                  * given are satisfied.  Return an error if we
 289                  * have been asked to list a mount point that does
 290                  * not match the other args we've been given (-l, -t, etc.)
 291                  */
 292                 if (checkvfsname(statfsbuf.f_fstypename, vfslist)) {
 293                         rv++;
 294                         continue;
 295                 }
 296                 if (argc == 1) {
 297                         bzero(&maxwidths, sizeof(maxwidths));
 298                         update_maxwidths(&maxwidths, &statfsbuf);
 299                 }
 300                 prtstat(&statfsbuf, &maxwidths);
 301         }
 302         return (rv);
 303 }
 304
 305 char *
 306 getmntpt(char *name)
 307 {
 308         long mntsize, i;
 309         struct statfs *mntbuf;
 310
 311         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 312         for (i = 0; i < mntsize; i++) {
 313                 if (!strcmp(mntbuf[i].f_mntfromname, name))
 314                         return (mntbuf[i].f_mntonname);
 315         }
 316         return (0);
 317 }
 318
 319 /*
 320  * Make a pass over the filesystem info in ``mntbuf'' filtering out
 321  * filesystem types not in vfslist and possibly re-stating to get
 322  * current (not cached) info.  Returns the new count of valid statfs bufs.
 323  */
 324 long
 325 regetmntinfo(struct statfs **mntbufp, long mntsize, char **vfslist)
 326 {
 327         int i, j;
 328         struct statfs *mntbuf;
 329
 330         if (vfslist == NULL)
 331                 return (nflag ? mntsize : getmntinfo(mntbufp, MNT_WAIT));
 332
 333         mntbuf = *mntbufp;
 334         for (j = 0, i = 0; i < mntsize; i++) {
 335                 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
 336                         continue;
 337                 if (!nflag)
 338                         (void)statfs(mntbuf[i].f_mntonname,&mntbuf[j]);
 339                 else if (i != j)
 340                         mntbuf[j] = mntbuf[i];
 341                 j++;
 342         }
 343         return (j);
 344 }
 345
 346 /*
 347  * Output in "human-readable" format.  Uses 3 digits max and puts
 348  * unit suffixes at the end.  Makes output compact and easy to read,
 349  * especially on huge disks.
 350  *
 351  */
 352 unit_t
 353 unit_adjust(double *val)
 354 {
 355         double abval;
 356         unit_t unit;
 357         unsigned int unit_sz;
 358
 359         abval = fabs(*val);
 360
 361         unit_sz = abval ? ilogb(abval) / 10 : 0;
 362
 363         if (unit_sz >= UNIT_MAX) {
 364                 unit = NONE;
 365         } else {
 366                 unit = unitp[unit_sz];
 367                 *val /= (double)valp[unit_sz];
 368         }
 369
 370         return (unit);
 371 }
 372
 373 void
 374 prthuman(struct statfs *sfsp, long used)
 375 {
 376
 377         prthumanval((double)sfsp->f_blocks * (double)sfsp->f_bsize);
 378         prthumanval((double)used * (double)sfsp->f_bsize);
 379         prthumanval((double)sfsp->f_bavail * (double)sfsp->f_bsize);
 380 }
 381
 382 void
 383 prthumanval(double bytes)
 384 {
 385
 386         unit_t unit;
 387         unit = unit_adjust(&bytes);
 388
 389         if (bytes == 0)
 390                 (void)printf("     0B");
 391         else if (bytes > 10)
 392                 (void)printf(" %5.0f%c", bytes, "BKMGTPE"[unit]);
 393         else
 394                 (void)printf(" %5.1f%c", bytes, "BKMGTPE"[unit]);
 395 }
 396
 397 /*
 398  * Convert statfs returned filesystem size into BLOCKSIZE units.
 399  * Attempts to avoid overflow for large filesystems.
 400  */
 401 #define fsbtoblk(num, fsbs, bs) \
 402         (((fsbs) != 0 && (fsbs) < (bs)) ? \
 403                 ((off_t)((unsigned)num)) / ((unsigned)(bs) / ((off_t)((unsigned)fsbs))) : ((off_t)((unsigned)num)) * ((off_t)((unsigned)fsbs)) / (bs))
 404
 405 /*
 406  * Print out status about a filesystem.
 407  */
 408 void
 409 prtstat(struct statfs *sfsp, struct maxwidths *mwp)
 410 {
 411         static long blocksize;
 412         static int headerlen, timesthrough;
 413         static const char *header;
 414         unsigned long used, availblks, inodes;
 415
 416         if (++timesthrough == 1) {
 417                 mwp->mntfrom = imax(mwp->mntfrom, strlen("Filesystem"));
 418                 if (hflag) {
 419                         header = "  Size";
 420                         mwp->total = mwp->used = mwp->avail = strlen(header);
 421                 } else {
 422                         header = getbsize(&headerlen, &blocksize);
 423                         mwp->total = imax(mwp->total, headerlen);
 424                 }
 425                 mwp->used = imax(mwp->used, strlen("Used"));
 426                 mwp->avail = imax(mwp->avail, strlen("Avail"));
 427
 428                 (void)printf("%-*s %-*s %*s %*s Capacity", mwp->mntfrom,
 429                     "Filesystem", mwp->total, header, mwp->used, "Used",
 430                     mwp->avail, "Avail");
 431                 if (iflag) {
 432                         mwp->iused = imax(mwp->iused, strlen("  iused"));
 433                         mwp->ifree = imax(mwp->ifree, strlen("ifree"));
 434                         (void)printf(" %*s %*s %%iused", mwp->iused - 2,
 435                             "iused", mwp->ifree, "ifree");
 436                 }
 437                 (void)printf("  Mounted on\n");
 438         }
 439
 440         (void)printf("%-*s", mwp->mntfrom, sfsp->f_mntfromname);
 441         used = (off_t)((unsigned)sfsp->f_blocks) - (off_t)((unsigned)sfsp->f_bfree);
 442         availblks = sfsp->f_bavail + used;
 443         if (hflag) {
 444                 prthuman(sfsp, used);
 445         } else {
 446                 (void)printf(" %*lld %*lld %*lld", mwp->total,
 447                     fsbtoblk(sfsp->f_blocks, sfsp->f_bsize, blocksize),
 448                     mwp->used, fsbtoblk(used, sfsp->f_bsize, blocksize),
 449                     mwp->avail, fsbtoblk(sfsp->f_bavail, sfsp->f_bsize,
 450                     blocksize));
 451         }
 452         (void)printf(" %5.0f%%",
 453             availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
 454         if (iflag) {
 455                 inodes = (unsigned)sfsp->f_files;
 456                 used = inodes - sfsp->f_ffree;
 457                 (void)printf(" %*lu %*lu %4.0f%% ", mwp->iused, used,
 458                     mwp->ifree, (unsigned long)sfsp->f_ffree, inodes == 0 ? 100.0 :
 459                     (double)used / (double)inodes * 100.0);
 460         } else
 461                 (void)printf("  ");
 462         (void)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)
 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, longwidth(fsbtoblk(sfsp->f_blocks,
 480             sfsp->f_bsize, blocksize)));
 481         mwp->used = imax(mwp->used, longwidth(fsbtoblk(sfsp->f_blocks -
 482             sfsp->f_bfree, sfsp->f_bsize, blocksize)));
 483         mwp->avail = imax(mwp->avail, longwidth(fsbtoblk(sfsp->f_bavail,
 484             sfsp->f_bsize, blocksize)));
 485         mwp->iused = imax(mwp->iused, longwidth((unsigned)(sfsp->f_files -
 486             sfsp->f_ffree)));
 487         mwp->ifree = imax(mwp->ifree, longwidth((unsigned)(sfsp->f_ffree)));
 488 }
 489
 490 /* Return the width in characters of the specified long. */
 491 int
 492 longwidth(long long 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
 507         return (len);
 508 }
 509
 510 /*
 511  * This code constitutes the pre-system call Berkeley df code for extracting
 512  * information from filesystem superblocks.
 513  */
 514
 515 union {
 516         struct fs iu_fs;
 517         char dummy[SBSIZE];
 518 } sb;
 519 #define sblock sb.iu_fs
 520
 521 int     rfd;
 522
 523 int
 524 ufs_df(char *file, struct maxwidths *mwp)
 525 {
 526         struct statfs statfsbuf;
 527         struct statfs *sfsp;
 528         const char *mntpt;
 529         static int synced;
 530
 531         if (synced++ == 0)
 532                 sync();
 533
 534         if ((rfd = open(file, O_RDONLY)) < 0) {
 535                 warn("%s", file);
 536                 return (1);
 537         }
 538         if (bread((off_t)SBOFF, &sblock, SBSIZE) == 0) {
 539                 (void)close(rfd);
 540                 return (1);
 541         }
 542         sfsp = &statfsbuf;
 543         sfsp->f_type = 1;
 544         strcpy(sfsp->f_fstypename, "ufs");
 545         sfsp->f_flags = 0;
 546         sfsp->f_bsize = sblock.fs_fsize;
 547         sfsp->f_iosize = sblock.fs_bsize;
 548         sfsp->f_blocks = sblock.fs_dsize;
 549         sfsp->f_bfree = sblock.fs_cstotal.cs_nbfree * sblock.fs_frag +
 550                 sblock.fs_cstotal.cs_nffree;
 551         sfsp->f_bavail = freespace(&sblock, sblock.fs_minfree);
 552         sfsp->f_files =  sblock.fs_ncg * sblock.fs_ipg;
 553         sfsp->f_ffree = sblock.fs_cstotal.cs_nifree;
 554         sfsp->f_fsid.val[0] = 0;
 555         sfsp->f_fsid.val[1] = 0;
 556         if ((mntpt = getmntpt(file)) == 0)
 557                 mntpt = "";
 558         memmove(&sfsp->f_mntonname[0], mntpt, (size_t)MNAMELEN);
 559         memmove(&sfsp->f_mntfromname[0], file, (size_t)MNAMELEN);
 560         prtstat(sfsp, mwp);
 561         (void)close(rfd);
 562         return (0);
 563 }
 564
 565 int
 566 bread(off_t off, void *buf, int cnt)
 567 {
 568         ssize_t nr;
 569
 570         (void)lseek(rfd, off, SEEK_SET);
 571         if ((nr = read(rfd, buf, (size_t)cnt)) != (ssize_t)cnt) {
 572                 /* Probably a dismounted disk if errno == EIO. */
 573                 if (errno != EIO)
 574                         (void)fprintf(stderr, "\ndf: %lld: %s\n",
 575                             (long long)off, strerror(nr > 0 ? EIO : errno));
 576                 return (0);
 577         }
 578         return (1);
 579 }
 580
 581 void
 582 usage(void)
 583 {
 584
 585         (void)fprintf(stderr,
 586             "usage: df [-b | -H | -h | -k | -m | -P] [-ailn] [-t type] [file | filesystem ...]\n");
 587         exit(EX_USAGE);
 588 }
 589
 590 char *
 591 makenetvfslist(void)
 592 {
 593         char *str, *strptr, **listptr;
 594 #ifndef __APPLE__
 595         int mib[3], maxvfsconf, cnt=0, i;
 596         size_t miblen;
 597         struct ovfsconf *ptr;
 598 #else
 599         int mib[4], maxvfsconf, cnt=0, i;
 600         size_t miblen;
 601         struct vfsconf vfc;
 602 #endif
 603
 604         mib[0] = CTL_VFS; mib[1] = VFS_GENERIC; mib[2] = VFS_MAXTYPENUM;
 605         miblen=sizeof(maxvfsconf);
 606         if (sysctl(mib, (unsigned int)(sizeof(mib) / sizeof(mib[0])),
 607             &maxvfsconf, &miblen, NULL, 0)) {
 608                 warnx("sysctl failed");
 609                 return (NULL);
 610         }
 611
 612         if ((listptr = malloc(sizeof(char*) * maxvfsconf)) == NULL) {
 613                 warnx("malloc failed");
 614                 return (NULL);
 615         }
 616
 617 #ifndef __APPLE__
 618         for (ptr = getvfsent(); ptr; ptr = getvfsent())
 619                 if (ptr->vfc_flags & VFCF_NETWORK) {
 620                         listptr[cnt++] = strdup(ptr->vfc_name);
 621                         if (listptr[cnt-1] == NULL) {
 622                                 warnx("malloc failed");
 623                                 return (NULL);
 624                         }
 625                 }
 626 #else
 627         miblen = sizeof (struct vfsconf);
 628         mib[2] = VFS_CONF;
 629         for (i = 0; i < maxvfsconf; i++) {
 630                 mib[3] = i;
 631                 if (sysctl(mib, 4, &vfc, &miblen, NULL, 0) == 0) {
 632                         if (!(vfc.vfc_flags & MNT_LOCAL)) {
 633                                 listptr[cnt++] = strdup(vfc.vfc_name);
 634                                 if (listptr[cnt-1] == NULL) {
 635                                         warnx("malloc failed");
 636                                         return (NULL);
 637                                 }
 638                         }
 639                 }
 640         }
 641 #endif
 642
 643         if (cnt == 0 ||
 644             (str = malloc(sizeof(char) * (32 * cnt + cnt + 2))) == NULL) {
 645                 if (cnt > 0)
 646                         warnx("malloc failed");
 647                 free(listptr);
 648                 return (NULL);
 649         }
 650
 651         *str = 'n'; *(str + 1) = 'o';
 652         for (i = 0, strptr = str + 2; i < cnt; i++, strptr++) {
 653                 strncpy(strptr, listptr[i], 32);
 654                 strptr += strlen(listptr[i]);
 655                 *strptr = ',';
 656                 free(listptr[i]);
 657         }
 658         *(--strptr) = NULL;
 659
 660         free(listptr);
 661         return (str);
 662 }