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 #include <err.h>
  68 #include <errno.h>
  69 #include <fcntl.h>
  70 #include <fstab.h>
  71 #include <math.h>
  72 #include <stdio.h>
  73 #include <stdlib.h>
  74 #include <string.h>
  75 #include <sysexits.h>
  76 #include <unistd.h>
  77
  78 #ifdef __APPLE__
  79 #include "get_compat.h"
  80 #else
  81 #define COMPAT_MODE(func, mode) 1
  82 #endif
  83
  84 #define UNITS_SI 1
  85 #define UNITS_2 2
  86
  87 #define KILO_SZ(n) (n)
  88 #define MEGA_SZ(n) ((n) * (n))
  89 #define GIGA_SZ(n) ((n) * (n) * (n))
  90 #define TERA_SZ(n) ((n) * (n) * (n) * (n))
  91 #define PETA_SZ(n) ((n) * (n) * (n) * (n) * (n))
  92
  93 #define KILO_2_SZ (KILO_SZ(1024ULL))
  94 #define MEGA_2_SZ (MEGA_SZ(1024ULL))
  95 #define GIGA_2_SZ (GIGA_SZ(1024ULL))
  96 #define TERA_2_SZ (TERA_SZ(1024ULL))
  97 #define PETA_2_SZ (PETA_SZ(1024ULL))
  98
  99 #define KILO_SI_SZ (KILO_SZ(1000ULL))
 100 #define MEGA_SI_SZ (MEGA_SZ(1000ULL))
 101 #define GIGA_SI_SZ (GIGA_SZ(1000ULL))
 102 #define TERA_SI_SZ (TERA_SZ(1000ULL))
 103 #define PETA_SI_SZ (PETA_SZ(1000ULL))
 104
 105 /* Maximum widths of various fields. */
 106 struct maxwidths {
 107         int mntfrom;
 108         int total;
 109         int used;
 110         int avail;
 111         int iused;
 112         int ifree;
 113 };
 114
 115 unsigned long long vals_si [] = {1, KILO_SI_SZ, MEGA_SI_SZ, GIGA_SI_SZ, TERA_SI_SZ, PETA_SI_SZ};
 116 unsigned long long vals_base2[] = {1, KILO_2_SZ, MEGA_2_SZ, GIGA_2_SZ, TERA_2_SZ, PETA_2_SZ};
 117 unsigned long long *valp;
 118
 119 typedef enum { NONE, KILO, MEGA, GIGA, TERA, PETA, UNIT_MAX } unit_t;
 120
 121 unit_t unitp [] = { NONE, KILO, MEGA, GIGA, TERA, PETA };
 122
 123 int       bread(off_t, void *, int);
 124 int       checkvfsname(const char *, char **);
 125 char     *getmntpt(char *);
 126 int       longwidth(long long);
 127 char     *makenetvfslist(void);
 128 char    **makevfslist(char *);
 129 void      prthuman(struct statfs *, long);
 130 void      prthumanval(double);
 131 void      prtstat(struct statfs *, struct maxwidths *);
 132 long      regetmntinfo(struct statfs **, long, char **);
 133 int       ufs_df(char *, struct maxwidths *);
 134 unit_t    unit_adjust(double *);
 135 void      update_maxwidths(struct maxwidths *, struct statfs *);
 136 void      usage(void);
 137
 138 int     aflag = 0, hflag, iflag, nflag;
 139 struct  ufs_args mdev;
 140
 141 static __inline int imax(int a, int b)
 142 {
 143         return (a > b ? a : b);
 144 }
 145
 146 int
 147 main(int argc, char *argv[])
 148 {
 149         struct stat stbuf;
 150         struct statfs statfsbuf, *mntbuf;
 151         struct maxwidths maxwidths;
 152         const char *fstype;
 153         char *mntpath, *mntpt, **vfslist;
 154         long mntsize;
 155         int ch, i, rv, tflag = 0, kludge_tflag = 0;
 156         const char *options = "abgHhiklmnPt:T:";
 157         if (COMPAT_MODE("bin/df", "unix2003")) {
 158                 /* Unix2003 requires -t be "include total capicity". which df
 159                   already does, but it conflits with the old -t so we need to
 160                   *not* expect a string after -t (we provide -T in both cases
 161                   to cover the old use of -t) */
 162                 options = "abgHhiklmnPtT:";
 163         }
 164
 165         fstype = "ufs";
 166
 167         vfslist = NULL;
 168         while ((ch = getopt(argc, argv, options)) != -1)
 169                 switch (ch) {
 170                 case 'a':
 171                         aflag = 1;
 172                         break;
 173                 case 'b':
 174                                 /* FALLTHROUGH */
 175                 case 'P':
 176                         putenv("BLOCKSIZE=512");
 177                         hflag = 0;
 178                         break;
 179                 case 'g':
 180                         putenv("BLOCKSIZE=1g");
 181                         hflag = 0;
 182                         break;
 183                 case 'H':
 184                         hflag = UNITS_SI;
 185                         valp = vals_si;
 186                         break;
 187                 case 'h':
 188                         hflag = UNITS_2;
 189                         valp = vals_base2;
 190                         break;
 191                 case 'i':
 192                         iflag = 1;
 193                         break;
 194                 case 'k':
 195                         putenv("BLOCKSIZE=1k");
 196                         hflag = 0;
 197                         break;
 198                 case 'l':
 199                         if (tflag)
 200                                 errx(1, "-l and -T are mutually exclusive.");
 201                         if (vfslist != NULL)
 202                                 break;
 203                         vfslist = makevfslist(makenetvfslist());
 204                         break;
 205                 case 'm':
 206                         putenv("BLOCKSIZE=1m");
 207                         hflag = 0;
 208                         break;
 209                 case 'n':
 210                         nflag = 1;
 211                         break;
 212                 case 't':
 213                         /* Unix2003 uses -t for something we do by default */
 214                         if (COMPAT_MODE("bin/df", "unix2003")) {
 215                             kludge_tflag = 1;
 216                             break;
 217                         }
 218                 case 'T':
 219                         if (vfslist != NULL) {
 220                                 if (tflag)
 221                                         errx(1, "only one -%c option may be specified", ch);
 222                                 else
 223                                         errx(1, "-l and -%c are mutually exclusive.", ch);
 224                         }
 225                         tflag++;
 226                         fstype = optarg;
 227                         vfslist = makevfslist(optarg);
 228                         break;
 229                 case '?':
 230                 default:
 231                         usage();
 232                 }
 233         argc -= optind;
 234         argv += optind;
 235
 236         /* If we are in unix2003 mode, have seen a -t but no -T and the first
 237           non switch arg isn't a file, let's pretend they used -T on it.
 238           This makes the Lexmark printer installer happy (PR-3918471) */
 239         if (tflag == 0 && kludge_tflag && *argv && stat(*argv, &stbuf) < 0
 240           && errno == ENOENT) {
 241             tflag = 1;
 242             fstype = *argv++;
 243             vfslist = makevfslist(fstype);
 244         }
 245
 246         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 247         bzero(&maxwidths, sizeof(maxwidths));
 248         for (i = 0; i < mntsize; i++)
 249                 update_maxwidths(&maxwidths, &mntbuf[i]);
 250
 251         rv = 0;
 252         if (!*argv) {
 253                 mntsize = regetmntinfo(&mntbuf, mntsize, vfslist);
 254                 bzero(&maxwidths, sizeof(maxwidths));
 255                 for (i = 0; i < mntsize; i++)
 256                         update_maxwidths(&maxwidths, &mntbuf[i]);
 257                 for (i = 0; i < mntsize; i++) {
 258                         if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0)
 259                                 prtstat(&mntbuf[i], &maxwidths);
 260                 }
 261                 exit(rv);
 262         }
 263
 264         for (; *argv; argv++) {
 265                 if (stat(*argv, &stbuf) < 0) {
 266                         if ((mntpt = getmntpt(*argv)) == 0) {
 267                                 warn("%s", *argv);
 268                                 rv = 1;
 269                                 continue;
 270                         }
 271                 } else if (S_ISCHR(stbuf.st_mode) || S_ISBLK(stbuf.st_mode)) {
 272                         if ((mntpt = getmntpt(*argv)) == 0) {
 273                                 mdev.fspec = *argv;
 274                                 mntpath = strdup("/tmp/df.XXXXXX");
 275                                 if (mntpath == NULL) {
 276                                         warn("strdup failed");
 277                                         rv = 1;
 278                                         continue;
 279                                 }
 280                                 mntpt = mkdtemp(mntpath);
 281                                 if (mntpt == NULL) {
 282                                         warn("mkdtemp(\"%s\") failed", mntpath);
 283                                         rv = 1;
 284                                         free(mntpath);
 285                                         continue;
 286                                 }
 287                                 if (mount(fstype, mntpt, MNT_RDONLY,
 288                                     &mdev) != 0) {
 289                                         rv = ufs_df(*argv, &maxwidths) || rv;
 290                                         (void)rmdir(mntpt);
 291                                         free(mntpath);
 292                                         continue;
 293                                 } else if (statfs(mntpt, &statfsbuf) == 0) {
 294                                         statfsbuf.f_mntonname[0] = '\0';
 295                                         prtstat(&statfsbuf, &maxwidths);
 296                                 } else {
 297                                         warn("%s", *argv);
 298                                         rv = 1;
 299                                 }
 300                                 (void)unmount(mntpt, 0);
 301                                 (void)rmdir(mntpt);
 302                                 free(mntpath);
 303                                 continue;
 304                         }
 305                 } else
 306                         mntpt = *argv;
 307                 /*
 308                  * Statfs does not take a `wait' flag, so we cannot
 309                  * implement nflag here.
 310                  */
 311                 if (statfs(mntpt, &statfsbuf) < 0) {
 312                         warn("%s", mntpt);
 313                         rv = 1;
 314                         continue;
 315                 }
 316                 /* Check to make sure the arguments we've been
 317                  * given are satisfied.  Return an error if we
 318                  * have been asked to list a mount point that does
 319                  * not match the other args we've been given (-l, -t, etc.)
 320                  */
 321                 if (checkvfsname(statfsbuf.f_fstypename, vfslist)) {
 322                         rv++;
 323                         continue;
 324                 }
 325                 if (argc == 1) {
 326                         bzero(&maxwidths, sizeof(maxwidths));
 327                         update_maxwidths(&maxwidths, &statfsbuf);
 328                 }
 329                 prtstat(&statfsbuf, &maxwidths);
 330         }
 331         return (rv);
 332 }
 333
 334 char *
 335 getmntpt(char *name)
 336 {
 337         long mntsize, i;
 338         struct statfs *mntbuf;
 339
 340         mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
 341         for (i = 0; i < mntsize; i++) {
 342                 if (!strcmp(mntbuf[i].f_mntfromname, name))
 343                         return (mntbuf[i].f_mntonname);
 344         }
 345         return (0);
 346 }
 347
 348 /*
 349  * Make a pass over the filesystem info in ``mntbuf'' filtering out
 350  * filesystem types not in vfslist and possibly re-stating to get
 351  * current (not cached) info.  Returns the new count of valid statfs bufs.
 352  */
 353 long
 354 regetmntinfo(struct statfs **mntbufp, long mntsize, char **vfslist)
 355 {
 356         int i, j;
 357         struct statfs *mntbuf;
 358
 359         if (vfslist == NULL)
 360                 return (nflag ? mntsize : getmntinfo(mntbufp, MNT_WAIT));
 361
 362         mntbuf = *mntbufp;
 363         for (j = 0, i = 0; i < mntsize; i++) {
 364                 if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
 365                         continue;
 366                 if (!nflag)
 367                         (void)statfs(mntbuf[i].f_mntonname,&mntbuf[j]);
 368                 else if (i != j)
 369                         mntbuf[j] = mntbuf[i];
 370                 j++;
 371         }
 372         return (j);
 373 }
 374
 375 /*
 376  * Output in "human-readable" format.  Uses 3 digits max and puts
 377  * unit suffixes at the end.  Makes output compact and easy to read,
 378  * especially on huge disks.
 379  *
 380  */
 381 unit_t
 382 unit_adjust(double *val)
 383 {
 384         double abval;
 385         unit_t unit;
 386         unsigned int unit_sz;
 387
 388         abval = fabs(*val);
 389
 390         unit_sz = abval ? ilogb(abval) / 10 : 0;
 391
 392         if (unit_sz >= UNIT_MAX) {
 393                 unit = NONE;
 394         } else {
 395                 unit = unitp[unit_sz];
 396                 *val /= (double)valp[unit_sz];
 397         }
 398
 399         return (unit);
 400 }
 401
 402 void
 403 prthuman(struct statfs *sfsp, long used)
 404 {
 405
 406         prthumanval((double)sfsp->f_blocks * (double)sfsp->f_bsize);
 407         prthumanval((double)used * (double)sfsp->f_bsize);
 408         prthumanval((double)sfsp->f_bavail * (double)sfsp->f_bsize);
 409 }
 410
 411 void
 412 prthumanval(double bytes)
 413 {
 414
 415         unit_t unit;
 416         unit = unit_adjust(&bytes);
 417
 418         if (bytes == 0)
 419                 (void)printf("     0B");
 420         else if (bytes > 10)
 421                 (void)printf(" %5.0f%c", bytes, "BKMGTPE"[unit]);
 422         else
 423                 (void)printf(" %5.1f%c", bytes, "BKMGTPE"[unit]);
 424 }
 425
 426 /*
 427  * Convert statfs returned filesystem size into BLOCKSIZE units.
 428  * Attempts to avoid overflow for large filesystems.
 429  */
 430 #define fsbtoblk(num, fsbs, bs) \
 431         (((fsbs) != 0 && (fsbs) < (bs)) ? \
 432                 ((off_t)((unsigned)num)) / ((unsigned)(bs) / ((off_t)((unsigned)fsbs))) : ((off_t)((unsigned)num)) * ((off_t)((unsigned)fsbs)) / (bs))
 433
 434 /*
 435  * Print out status about a filesystem.
 436  */
 437 void
 438 prtstat(struct statfs *sfsp, struct maxwidths *mwp)
 439 {
 440         static long blocksize;
 441         static int headerlen, timesthrough;
 442         static const char *header;
 443         unsigned long used, availblks, inodes;
 444
 445         if (++timesthrough == 1) {
 446                 mwp->mntfrom = imax(mwp->mntfrom, strlen("Filesystem"));
 447                 if (hflag) {
 448                         header = "  Size";
 449                         mwp->total = mwp->used = mwp->avail = strlen(header);
 450                 } else {
 451                         header = getbsize(&headerlen, &blocksize);
 452                         mwp->total = imax(mwp->total, headerlen);
 453                 }
 454                 mwp->used = imax(mwp->used, strlen("Used"));
 455                 mwp->avail = imax(mwp->avail, strlen("Avail"));
 456
 457                 (void)printf("%-*s %-*s %*s %*s Capacity", mwp->mntfrom,
 458                     "Filesystem", mwp->total, header, mwp->used, "Used",
 459                     mwp->avail, "Avail");
 460                 if (iflag) {
 461                         mwp->iused = imax(mwp->iused, strlen("  iused"));
 462                         mwp->ifree = imax(mwp->ifree, strlen("ifree"));
 463                         (void)printf(" %*s %*s %%iused", mwp->iused - 2,
 464                             "iused", mwp->ifree, "ifree");
 465                 }
 466                 (void)printf("  Mounted on\n");
 467         }
 468
 469         (void)printf("%-*s", mwp->mntfrom, sfsp->f_mntfromname);
 470         used = (off_t)((unsigned)sfsp->f_blocks) - (off_t)((unsigned)sfsp->f_bfree);
 471         availblks = sfsp->f_bavail + used;
 472         if (hflag) {
 473                 prthuman(sfsp, used);
 474         } else {
 475                 (void)printf(" %*lld %*lld %*lld", mwp->total,
 476                     fsbtoblk(sfsp->f_blocks, sfsp->f_bsize, blocksize),
 477                     mwp->used, fsbtoblk(used, sfsp->f_bsize, blocksize),
 478                     mwp->avail, fsbtoblk(sfsp->f_bavail, sfsp->f_bsize,
 479                     blocksize));
 480         }
 481         (void)printf(" %5.0f%%",
 482             availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
 483         if (iflag) {
 484                 inodes = (unsigned)sfsp->f_files;
 485                 used = inodes - sfsp->f_ffree;
 486                 (void)printf(" %*lu %*lu %4.0f%% ", mwp->iused, used,
 487                     mwp->ifree, (unsigned long)sfsp->f_ffree, inodes == 0 ? 100.0 :
 488                     (double)used / (double)inodes * 100.0);
 489         } else
 490                 (void)printf("  ");
 491         (void)printf("  %s\n", sfsp->f_mntonname);
 492 }
 493
 494 /*
 495  * Update the maximum field-width information in `mwp' based on
 496  * the filesystem specified by `sfsp'.
 497  */
 498 void
 499 update_maxwidths(struct maxwidths *mwp, struct statfs *sfsp)
 500 {
 501         static long blocksize;
 502         int dummy;
 503
 504         if (blocksize == 0)
 505                 getbsize(&dummy, &blocksize);
 506
 507         mwp->mntfrom = imax(mwp->mntfrom, strlen(sfsp->f_mntfromname));
 508         mwp->total = imax(mwp->total, longwidth(fsbtoblk(sfsp->f_blocks,
 509             sfsp->f_bsize, blocksize)));
 510         mwp->used = imax(mwp->used, longwidth(fsbtoblk(sfsp->f_blocks -
 511             sfsp->f_bfree, sfsp->f_bsize, blocksize)));
 512         mwp->avail = imax(mwp->avail, longwidth(fsbtoblk(sfsp->f_bavail,
 513             sfsp->f_bsize, blocksize)));
 514         mwp->iused = imax(mwp->iused, longwidth((unsigned)(sfsp->f_files -
 515             sfsp->f_ffree)));
 516         mwp->ifree = imax(mwp->ifree, longwidth((unsigned)(sfsp->f_ffree)));
 517 }
 518
 519 /* Return the width in characters of the specified long. */
 520 int
 521 longwidth(long long val)
 522 {
 523         int len;
 524
 525         len = 0;
 526         /* Negative or zero values require one extra digit. */
 527         if (val <= 0) {
 528                 val = -val;
 529                 len++;
 530         }
 531         while (val > 0) {
 532                 len++;
 533                 val /= 10;
 534         }
 535
 536         return (len);
 537 }
 538
 539 /*
 540  * This code constitutes the pre-system call Berkeley df code for extracting
 541  * information from filesystem superblocks.
 542  */
 543
 544 union {
 545         struct fs iu_fs;
 546         char dummy[SBSIZE];
 547 } sb;
 548 #define sblock sb.iu_fs
 549
 550 int     rfd;
 551
 552 int
 553 ufs_df(char *file, struct maxwidths *mwp)
 554 {
 555         struct statfs statfsbuf;
 556         struct statfs *sfsp;
 557         const char *mntpt;
 558         static int synced;
 559
 560         if (synced++ == 0)
 561                 sync();
 562
 563         if ((rfd = open(file, O_RDONLY)) < 0) {
 564                 warn("%s", file);
 565                 return (1);
 566         }
 567         if (bread((off_t)SBOFF, &sblock, SBSIZE) == 0) {
 568                 (void)close(rfd);
 569                 return (1);
 570         }
 571         sfsp = &statfsbuf;
 572         sfsp->f_type = 1;
 573         strcpy(sfsp->f_fstypename, "ufs");
 574         sfsp->f_flags = 0;
 575         sfsp->f_bsize = sblock.fs_fsize;
 576         sfsp->f_iosize = sblock.fs_bsize;
 577         sfsp->f_blocks = sblock.fs_dsize;
 578         sfsp->f_bfree = sblock.fs_cstotal.cs_nbfree * sblock.fs_frag +
 579                 sblock.fs_cstotal.cs_nffree;
 580         sfsp->f_bavail = freespace(&sblock, sblock.fs_minfree);
 581         sfsp->f_files =  sblock.fs_ncg * sblock.fs_ipg;
 582         sfsp->f_ffree = sblock.fs_cstotal.cs_nifree;
 583         sfsp->f_fsid.val[0] = 0;
 584         sfsp->f_fsid.val[1] = 0;
 585         if ((mntpt = getmntpt(file)) == 0)
 586                 mntpt = "";
 587         memmove(&sfsp->f_mntonname[0], mntpt, (size_t)MNAMELEN);
 588         memmove(&sfsp->f_mntfromname[0], file, (size_t)MNAMELEN);
 589         prtstat(sfsp, mwp);
 590         (void)close(rfd);
 591         return (0);
 592 }
 593
 594 int
 595 bread(off_t off, void *buf, int cnt)
 596 {
 597         ssize_t nr;
 598
 599         (void)lseek(rfd, off, SEEK_SET);
 600         if ((nr = read(rfd, buf, (size_t)cnt)) != (ssize_t)cnt) {
 601                 /* Probably a dismounted disk if errno == EIO. */
 602                 if (errno != EIO)
 603                         (void)fprintf(stderr, "\ndf: %lld: %s\n",
 604                             (long long)off, strerror(nr > 0 ? EIO : errno));
 605                 return (0);
 606         }
 607         return (1);
 608 }
 609
 610 void
 611 usage(void)
 612 {
 613
 614         char *t_flag = COMPAT_MODE("bin/df", "unix2003") ? "[-t]" : "[-t type]";
 615         (void)fprintf(stderr,
 616             "usage: df [-b | -H | -h | -k | -m | -P] [-ailn] [-T type] %s [file | filesystem ...]\n", t_flag);
 617         exit(EX_USAGE);
 618 }
 619
 620 char *
 621 makenetvfslist(void)
 622 {
 623         char *str, *strptr, **listptr;
 624 #ifndef __APPLE__
 625         int mib[3], maxvfsconf, cnt=0, i;
 626         size_t miblen;
 627         struct ovfsconf *ptr;
 628 #else
 629         int mib[4], maxvfsconf, cnt=0, i;
 630         size_t miblen;
 631         struct vfsconf vfc;
 632 #endif
 633
 634         mib[0] = CTL_VFS; mib[1] = VFS_GENERIC; mib[2] = VFS_MAXTYPENUM;
 635         miblen=sizeof(maxvfsconf);
 636         if (sysctl(mib, (unsigned int)(sizeof(mib) / sizeof(mib[0])),
 637             &maxvfsconf, &miblen, NULL, 0)) {
 638                 warnx("sysctl failed");
 639                 return (NULL);
 640         }
 641
 642         if ((listptr = malloc(sizeof(char*) * maxvfsconf)) == NULL) {
 643                 warnx("malloc failed");
 644                 return (NULL);
 645         }
 646
 647 #ifndef __APPLE__
 648         for (ptr = getvfsent(); ptr; ptr = getvfsent())
 649                 if (ptr->vfc_flags & VFCF_NETWORK) {
 650                         listptr[cnt++] = strdup(ptr->vfc_name);
 651                         if (listptr[cnt-1] == NULL) {
 652                                 warnx("malloc failed");
 653                                 return (NULL);
 654                         }
 655                 }
 656 #else
 657         miblen = sizeof (struct vfsconf);
 658         mib[2] = VFS_CONF;
 659         for (i = 0; i < maxvfsconf; i++) {
 660                 mib[3] = i;
 661                 if (sysctl(mib, 4, &vfc, &miblen, NULL, 0) == 0) {
 662                         if (!(vfc.vfc_flags & MNT_LOCAL)) {
 663                                 listptr[cnt++] = strdup(vfc.vfc_name);
 664                                 if (listptr[cnt-1] == NULL) {
 665                                         warnx("malloc failed");
 666                                         return (NULL);
 667                                 }
 668                         }
 669                 }
 670         }
 671 #endif
 672
 673         if (cnt == 0 ||
 674             (str = malloc(sizeof(char) * (32 * cnt + cnt + 2))) == NULL) {
 675                 if (cnt > 0)
 676                         warnx("malloc failed");
 677                 free(listptr);
 678                 return (NULL);
 679         }
 680
 681         *str = 'n'; *(str + 1) = 'o';
 682         for (i = 0, strptr = str + 2; i < cnt; i++, strptr++) {
 683                 strncpy(strptr, listptr[i], 32);
 684                 strptr += strlen(listptr[i]);
 685                 *strptr = ',';
 686                 free(listptr[i]);
 687         }
 688         *(--strptr) = '\0';
 689
 690         free(listptr);
 691         return (str);
 692 }