| 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 1.13 2008/08/07 09:59:49 swildner 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 <libutil.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 | /* Maximum widths of various fields. */ |
| 70 | struct maxwidths { |
| 71 | int mntfrom; |
| 72 | int total; |
| 73 | int used; |
| 74 | int avail; |
| 75 | int iused; |
| 76 | int ifree; |
| 77 | }; |
| 78 | |
| 79 | int bread(off_t, void *, int); |
| 80 | int checkvfsname(const char *, char **); |
| 81 | char *getmntpt(char *); |
| 82 | int quadwidth(int64_t); |
| 83 | char *makenetvfslist(void); |
| 84 | char **makevfslist(char *); |
| 85 | void prthuman(struct statvfs *, int64_t); |
| 86 | void prthumanval(int64_t); |
| 87 | void prtstat(struct statfs *, struct statvfs *, struct maxwidths *); |
| 88 | long regetmntinfo(struct statfs **, struct statvfs **, long, char **); |
| 89 | int ufs_df(char *, struct maxwidths *); |
| 90 | void update_maxwidths(struct maxwidths *, struct statfs *, struct statvfs *); |
| 91 | void usage(void); |
| 92 | |
| 93 | int aflag = 0, hflag, iflag, nflag; |
| 94 | struct ufs_args mdev; |
| 95 | |
| 96 | static __inline int |
| 97 | imax(int a, int b) |
| 98 | { |
| 99 | return (a > b ? a : b); |
| 100 | } |
| 101 | |
| 102 | static __inline int64_t |
| 103 | qmax(int64_t a, int64_t b) |
| 104 | { |
| 105 | return (a > b ? a : b); |
| 106 | } |
| 107 | |
| 108 | int |
| 109 | main(int argc, char **argv) |
| 110 | { |
| 111 | struct stat stbuf; |
| 112 | struct statfs statfsbuf, *mntbuf; |
| 113 | struct statvfs statvfsbuf, *mntvbuf; |
| 114 | struct maxwidths maxwidths; |
| 115 | const char *fstype; |
| 116 | char *mntpath, *mntpt, **vfslist; |
| 117 | long mntsize; |
| 118 | int ch, i, rv; |
| 119 | |
| 120 | fstype = "ufs"; |
| 121 | |
| 122 | vfslist = NULL; |
| 123 | while ((ch = getopt(argc, argv, "abgHhiklmnPt:")) != -1) |
| 124 | switch (ch) { |
| 125 | case 'a': |
| 126 | aflag = 1; |
| 127 | break; |
| 128 | case 'b': |
| 129 | /* FALLTHROUGH */ |
| 130 | case 'P': |
| 131 | if (putenv("BLOCKSIZE=512") != 0) |
| 132 | warn("putenv: cannot set BLOCKSIZE=512"); |
| 133 | hflag = 0; |
| 134 | break; |
| 135 | case 'g': |
| 136 | if (putenv("BLOCKSIZE=1g") != 0) |
| 137 | warn("putenv: cannot set BLOCKSIZE=1g"); |
| 138 | hflag = 0; |
| 139 | break; |
| 140 | case 'H': |
| 141 | hflag = UNITS_SI; |
| 142 | break; |
| 143 | case 'h': |
| 144 | hflag = UNITS_2; |
| 145 | break; |
| 146 | case 'i': |
| 147 | iflag = 1; |
| 148 | break; |
| 149 | case 'k': |
| 150 | if (putenv("BLOCKSIZE=1k") != 0) |
| 151 | warn("putenv: cannot set BLOCKSIZE=1k"); |
| 152 | hflag = 0; |
| 153 | break; |
| 154 | case 'l': |
| 155 | if (vfslist != NULL) |
| 156 | errx(1, "-l and -t are mutually exclusive."); |
| 157 | vfslist = makevfslist(makenetvfslist()); |
| 158 | break; |
| 159 | case 'm': |
| 160 | if (putenv("BLOCKSIZE=1m") != 0) |
| 161 | warn("putenv: cannot set BLOCKSIZE=1m"); |
| 162 | hflag = 0; |
| 163 | break; |
| 164 | case 'n': |
| 165 | nflag = 1; |
| 166 | break; |
| 167 | case 't': |
| 168 | if (vfslist != NULL) |
| 169 | errx(1, "only one -t option may be specified"); |
| 170 | fstype = optarg; |
| 171 | vfslist = makevfslist(optarg); |
| 172 | break; |
| 173 | case '?': |
| 174 | default: |
| 175 | usage(); |
| 176 | } |
| 177 | argc -= optind; |
| 178 | argv += optind; |
| 179 | |
| 180 | mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT); |
| 181 | bzero(&maxwidths, sizeof(maxwidths)); |
| 182 | for (i = 0; i < mntsize; i++) |
| 183 | update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]); |
| 184 | |
| 185 | rv = 0; |
| 186 | if (!*argv) { |
| 187 | mntsize = regetmntinfo(&mntbuf, &mntvbuf, mntsize, vfslist); |
| 188 | bzero(&maxwidths, sizeof(maxwidths)); |
| 189 | for (i = 0; i < mntsize; i++) |
| 190 | update_maxwidths(&maxwidths, &mntbuf[i], &mntvbuf[i]); |
| 191 | for (i = 0; i < mntsize; i++) { |
| 192 | if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0) |
| 193 | prtstat(&mntbuf[i], &mntvbuf[i], &maxwidths); |
| 194 | } |
| 195 | exit(rv); |
| 196 | } |
| 197 | |
| 198 | for (; *argv; argv++) { |
| 199 | if (stat(*argv, &stbuf) < 0) { |
| 200 | if ((mntpt = getmntpt(*argv)) == 0) { |
| 201 | warn("%s", *argv); |
| 202 | rv = 1; |
| 203 | continue; |
| 204 | } |
| 205 | } else if (S_ISCHR(stbuf.st_mode)) { |
| 206 | if ((mntpt = getmntpt(*argv)) == 0) { |
| 207 | mdev.fspec = *argv; |
| 208 | mntpath = strdup("/tmp/df.XXXXXX"); |
| 209 | if (mntpath == NULL) { |
| 210 | warn("strdup failed"); |
| 211 | rv = 1; |
| 212 | continue; |
| 213 | } |
| 214 | mntpt = mkdtemp(mntpath); |
| 215 | if (mntpt == NULL) { |
| 216 | warn("mkdtemp(\"%s\") failed", mntpath); |
| 217 | rv = 1; |
| 218 | free(mntpath); |
| 219 | continue; |
| 220 | } |
| 221 | if (mount(fstype, mntpt, MNT_RDONLY, |
| 222 | &mdev) != 0) { |
| 223 | rv = ufs_df(*argv, &maxwidths) || rv; |
| 224 | rmdir(mntpt); |
| 225 | free(mntpath); |
| 226 | continue; |
| 227 | } else if (statfs(mntpt, &statfsbuf) == 0 && |
| 228 | statvfs(mntpt, &statvfsbuf) == 0) { |
| 229 | statfsbuf.f_mntonname[0] = '\0'; |
| 230 | prtstat(&statfsbuf, &statvfsbuf, &maxwidths); |
| 231 | } else { |
| 232 | warn("%s", *argv); |
| 233 | rv = 1; |
| 234 | } |
| 235 | unmount(mntpt, 0); |
| 236 | rmdir(mntpt); |
| 237 | free(mntpath); |
| 238 | continue; |
| 239 | } |
| 240 | } else |
| 241 | mntpt = *argv; |
| 242 | /* |
| 243 | * Statfs does not take a `wait' flag, so we cannot |
| 244 | * implement nflag here. |
| 245 | */ |
| 246 | if (statfs(mntpt, &statfsbuf) < 0) { |
| 247 | warn("%s", mntpt); |
| 248 | rv = 1; |
| 249 | continue; |
| 250 | } |
| 251 | if (statvfs(mntpt, &statvfsbuf) < 0) { |
| 252 | warn("%s", mntpt); |
| 253 | rv = 1; |
| 254 | continue; |
| 255 | } |
| 256 | if (argc == 1) { |
| 257 | bzero(&maxwidths, sizeof(maxwidths)); |
| 258 | update_maxwidths(&maxwidths, &statfsbuf, &statvfsbuf); |
| 259 | } |
| 260 | prtstat(&statfsbuf, &statvfsbuf, &maxwidths); |
| 261 | } |
| 262 | return (rv); |
| 263 | } |
| 264 | |
| 265 | char * |
| 266 | getmntpt(char *name) |
| 267 | { |
| 268 | long mntsize, i; |
| 269 | struct statfs *mntbuf; |
| 270 | struct statvfs *mntvbuf; |
| 271 | |
| 272 | mntsize = getmntvinfo(&mntbuf, &mntvbuf, MNT_NOWAIT); |
| 273 | for (i = 0; i < mntsize; i++) { |
| 274 | if (!strcmp(mntbuf[i].f_mntfromname, name)) |
| 275 | return (mntbuf[i].f_mntonname); |
| 276 | } |
| 277 | return (0); |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | * Make a pass over the filesystem info in ``mntbuf'' filtering out |
| 282 | * filesystem types not in vfslist and possibly re-stating to get |
| 283 | * current (not cached) info. Returns the new count of valid statfs bufs. |
| 284 | */ |
| 285 | long |
| 286 | regetmntinfo(struct statfs **mntbufp, struct statvfs **mntvbufp, long mntsize, char **vfslist) |
| 287 | { |
| 288 | int i, j; |
| 289 | struct statfs *mntbuf; |
| 290 | struct statvfs *mntvbuf; |
| 291 | |
| 292 | if (vfslist == NULL) |
| 293 | return (nflag ? mntsize : getmntvinfo(mntbufp, mntvbufp, MNT_WAIT)); |
| 294 | |
| 295 | mntbuf = *mntbufp; |
| 296 | mntvbuf = *mntvbufp; |
| 297 | for (j = 0, i = 0; i < mntsize; i++) { |
| 298 | if (checkvfsname(mntbuf[i].f_fstypename, vfslist)) |
| 299 | continue; |
| 300 | if (!nflag) { |
| 301 | statfs(mntbuf[i].f_mntonname,&mntbuf[j]); |
| 302 | statvfs(mntbuf[i].f_mntonname,&mntvbuf[j]); |
| 303 | } else if (i != j) { |
| 304 | mntbuf[j] = mntbuf[i]; |
| 305 | mntvbuf[j] = mntvbuf[i]; |
| 306 | } |
| 307 | j++; |
| 308 | } |
| 309 | return (j); |
| 310 | } |
| 311 | |
| 312 | void |
| 313 | prthuman(struct statvfs *vsfsp, int64_t used) |
| 314 | { |
| 315 | prthumanval(vsfsp->f_blocks * vsfsp->f_bsize); |
| 316 | prthumanval(used * vsfsp->f_bsize); |
| 317 | prthumanval(vsfsp->f_bavail * vsfsp->f_bsize); |
| 318 | } |
| 319 | |
| 320 | void |
| 321 | prthumanval(int64_t bytes) |
| 322 | { |
| 323 | char buf[6]; |
| 324 | int flags; |
| 325 | |
| 326 | flags = HN_B | HN_NOSPACE | HN_DECIMAL; |
| 327 | if (hflag == UNITS_SI) |
| 328 | flags |= HN_DIVISOR_1000; |
| 329 | |
| 330 | humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1), |
| 331 | bytes, "", HN_AUTOSCALE, flags); |
| 332 | |
| 333 | printf(" %6s", buf); |
| 334 | } |
| 335 | |
| 336 | /* |
| 337 | * Convert statfs returned filesystem size into BLOCKSIZE units. |
| 338 | * Attempts to avoid overflow for large filesystems. |
| 339 | */ |
| 340 | static intmax_t |
| 341 | fsbtoblk(int64_t num, uint64_t bsize, u_long reqbsize) |
| 342 | { |
| 343 | if (bsize != 0 && bsize < reqbsize) |
| 344 | return (num / (intmax_t)(reqbsize / bsize)); |
| 345 | else |
| 346 | return (num * (intmax_t)(bsize / reqbsize)); |
| 347 | } |
| 348 | |
| 349 | /* |
| 350 | * Print out status about a filesystem. |
| 351 | */ |
| 352 | void |
| 353 | prtstat(struct statfs *sfsp, struct statvfs *vsfsp, struct maxwidths *mwp) |
| 354 | { |
| 355 | static long blocksize; |
| 356 | static int headerlen, timesthrough; |
| 357 | static const char *header; |
| 358 | int64_t used, availblks, inodes; |
| 359 | |
| 360 | if (++timesthrough == 1) { |
| 361 | mwp->mntfrom = imax(mwp->mntfrom, strlen("Filesystem")); |
| 362 | if (hflag) { |
| 363 | header = " Size"; |
| 364 | mwp->total = mwp->used = mwp->avail = strlen(header); |
| 365 | } else { |
| 366 | header = getbsize(&headerlen, &blocksize); |
| 367 | mwp->total = imax(mwp->total, headerlen); |
| 368 | } |
| 369 | mwp->used = imax(mwp->used, strlen("Used")); |
| 370 | mwp->avail = imax(mwp->avail, strlen("Avail")); |
| 371 | |
| 372 | printf("%-*s %-*s %*s %*s Capacity", mwp->mntfrom, |
| 373 | "Filesystem", mwp->total, header, mwp->used, "Used", |
| 374 | mwp->avail, "Avail"); |
| 375 | if (iflag) { |
| 376 | mwp->iused = imax(mwp->iused, strlen(" iused")); |
| 377 | mwp->ifree = imax(mwp->ifree, strlen("ifree")); |
| 378 | printf(" %*s %*s %%iused", mwp->iused - 2, |
| 379 | "iused", mwp->ifree, "ifree"); |
| 380 | } |
| 381 | printf(" Mounted on\n"); |
| 382 | } |
| 383 | printf("%-*s", mwp->mntfrom, sfsp->f_mntfromname); |
| 384 | used = vsfsp->f_blocks - vsfsp->f_bfree; |
| 385 | availblks = vsfsp->f_bavail + used; |
| 386 | if (hflag) { |
| 387 | prthuman(vsfsp, used); |
| 388 | } else { |
| 389 | printf(" %*jd %*jd %*jd", mwp->total, |
| 390 | fsbtoblk(vsfsp->f_blocks, vsfsp->f_bsize, blocksize), |
| 391 | mwp->used, fsbtoblk(used, vsfsp->f_bsize, blocksize), |
| 392 | mwp->avail, fsbtoblk(vsfsp->f_bavail, vsfsp->f_bsize, |
| 393 | blocksize)); |
| 394 | } |
| 395 | printf(" %5.0f%%", |
| 396 | availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0); |
| 397 | if (iflag) { |
| 398 | inodes = vsfsp->f_files; |
| 399 | used = inodes - vsfsp->f_ffree; |
| 400 | printf(" %*jd %*jd %4.0f%% ", mwp->iused, (intmax_t)used, |
| 401 | mwp->ifree, (intmax_t)vsfsp->f_ffree, inodes == 0 ? 100.0 : |
| 402 | (double)used / (double)inodes * 100.0); |
| 403 | } else |
| 404 | printf(" "); |
| 405 | printf(" %s\n", sfsp->f_mntonname); |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | * Update the maximum field-width information in `mwp' based on |
| 410 | * the filesystem specified by `sfsp'. |
| 411 | */ |
| 412 | void |
| 413 | update_maxwidths(struct maxwidths *mwp, struct statfs *sfsp, struct statvfs *vsfsp) |
| 414 | { |
| 415 | static long blocksize; |
| 416 | int dummy; |
| 417 | |
| 418 | if (blocksize == 0) |
| 419 | getbsize(&dummy, &blocksize); |
| 420 | |
| 421 | mwp->mntfrom = imax(mwp->mntfrom, strlen(sfsp->f_mntfromname)); |
| 422 | mwp->total = imax(mwp->total, quadwidth(fsbtoblk(vsfsp->f_blocks, |
| 423 | vsfsp->f_bsize, blocksize))); |
| 424 | mwp->used = imax(mwp->used, quadwidth(fsbtoblk(vsfsp->f_blocks - |
| 425 | vsfsp->f_bfree, vsfsp->f_bsize, blocksize))); |
| 426 | mwp->avail = imax(mwp->avail, quadwidth(fsbtoblk(vsfsp->f_bavail, |
| 427 | vsfsp->f_bsize, blocksize))); |
| 428 | mwp->iused = imax(mwp->iused, quadwidth(vsfsp->f_files - |
| 429 | vsfsp->f_ffree)); |
| 430 | mwp->ifree = imax(mwp->ifree, quadwidth(vsfsp->f_ffree)); |
| 431 | } |
| 432 | |
| 433 | /* Return the width in characters of the specified long. */ |
| 434 | int |
| 435 | quadwidth(int64_t val) |
| 436 | { |
| 437 | int len; |
| 438 | |
| 439 | len = 0; |
| 440 | /* Negative or zero values require one extra digit. */ |
| 441 | if (val <= 0) { |
| 442 | val = -val; |
| 443 | len++; |
| 444 | } |
| 445 | while (val > 0) { |
| 446 | len++; |
| 447 | val /= 10; |
| 448 | } |
| 449 | return (len); |
| 450 | } |
| 451 | |
| 452 | /* |
| 453 | * This code constitutes the pre-system call Berkeley df code for extracting |
| 454 | * information from filesystem superblocks. |
| 455 | */ |
| 456 | |
| 457 | union { |
| 458 | struct fs iu_fs; |
| 459 | char dummy[SBSIZE]; |
| 460 | } sb; |
| 461 | #define sblock sb.iu_fs |
| 462 | |
| 463 | int rfd; |
| 464 | |
| 465 | int |
| 466 | ufs_df(char *file, struct maxwidths *mwp) |
| 467 | { |
| 468 | struct statfs statfsbuf; |
| 469 | struct statvfs statvfsbuf; |
| 470 | struct statfs *sfsp; |
| 471 | struct statvfs *vsfsp; |
| 472 | const char *mntpt; |
| 473 | static int synced; |
| 474 | |
| 475 | if (synced++ == 0) |
| 476 | sync(); |
| 477 | |
| 478 | if ((rfd = open(file, O_RDONLY)) < 0) { |
| 479 | warn("%s", file); |
| 480 | return (1); |
| 481 | } |
| 482 | if (bread((off_t)SBOFF, &sblock, SBSIZE) == 0) { |
| 483 | close(rfd); |
| 484 | return (1); |
| 485 | } |
| 486 | sfsp = &statfsbuf; |
| 487 | vsfsp = &statvfsbuf; |
| 488 | sfsp->f_type = 1; |
| 489 | strcpy(sfsp->f_fstypename, "ufs"); |
| 490 | sfsp->f_flags = 0; |
| 491 | sfsp->f_bsize = vsfsp->f_bsize = sblock.fs_fsize; |
| 492 | sfsp->f_iosize = vsfsp->f_frsize = sblock.fs_bsize; |
| 493 | sfsp->f_blocks = vsfsp->f_blocks = sblock.fs_dsize; |
| 494 | sfsp->f_bfree = vsfsp->f_bfree = |
| 495 | sblock.fs_cstotal.cs_nbfree * sblock.fs_frag + |
| 496 | sblock.fs_cstotal.cs_nffree; |
| 497 | sfsp->f_bavail = vsfsp->f_bavail = freespace(&sblock, sblock.fs_minfree); |
| 498 | sfsp->f_files = vsfsp->f_files = sblock.fs_ncg * sblock.fs_ipg; |
| 499 | sfsp->f_ffree = vsfsp->f_ffree = sblock.fs_cstotal.cs_nifree; |
| 500 | sfsp->f_fsid.val[0] = 0; |
| 501 | sfsp->f_fsid.val[1] = 0; |
| 502 | if ((mntpt = getmntpt(file)) == 0) |
| 503 | mntpt = ""; |
| 504 | memmove(&sfsp->f_mntonname[0], mntpt, (size_t)MNAMELEN); |
| 505 | memmove(&sfsp->f_mntfromname[0], file, (size_t)MNAMELEN); |
| 506 | prtstat(sfsp, vsfsp, mwp); |
| 507 | close(rfd); |
| 508 | return (0); |
| 509 | } |
| 510 | |
| 511 | int |
| 512 | bread(off_t off, void *buf, int cnt) |
| 513 | { |
| 514 | ssize_t nr; |
| 515 | |
| 516 | lseek(rfd, off, SEEK_SET); |
| 517 | if ((nr = read(rfd, buf, (size_t)cnt)) != (ssize_t)cnt) { |
| 518 | /* Probably a dismounted disk if errno == EIO. */ |
| 519 | if (errno != EIO) |
| 520 | fprintf(stderr, "\ndf: %lld: %s\n", |
| 521 | (long long)off, strerror(nr > 0 ? EIO : errno)); |
| 522 | return (0); |
| 523 | } |
| 524 | return (1); |
| 525 | } |
| 526 | |
| 527 | void |
| 528 | usage(void) |
| 529 | { |
| 530 | |
| 531 | fprintf(stderr, |
| 532 | "usage: df [-b | -H | -h | -k | -m | -P] [-ailn] [-t type] [file | filesystem ...]\n"); |
| 533 | exit(EX_USAGE); |
| 534 | } |
| 535 | |
| 536 | char * |
| 537 | makenetvfslist(void) |
| 538 | { |
| 539 | char *str, *strptr, **listptr; |
| 540 | int mib[3], maxvfsconf, cnt=0, i; |
| 541 | size_t miblen; |
| 542 | struct ovfsconf *ptr; |
| 543 | |
| 544 | mib[0] = CTL_VFS; mib[1] = VFS_GENERIC; mib[2] = VFS_MAXTYPENUM; |
| 545 | miblen=sizeof(maxvfsconf); |
| 546 | if (sysctl(mib, (unsigned int)(sizeof(mib) / sizeof(mib[0])), |
| 547 | &maxvfsconf, &miblen, NULL, 0)) { |
| 548 | warnx("sysctl failed"); |
| 549 | return (NULL); |
| 550 | } |
| 551 | |
| 552 | if ((listptr = malloc(sizeof(char*) * maxvfsconf)) == NULL) { |
| 553 | warnx("malloc failed"); |
| 554 | return (NULL); |
| 555 | } |
| 556 | |
| 557 | for (ptr = getvfsent(); ptr; ptr = getvfsent()) |
| 558 | if (ptr->vfc_flags & VFCF_NETWORK) { |
| 559 | listptr[cnt++] = strdup(ptr->vfc_name); |
| 560 | if (listptr[cnt-1] == NULL) { |
| 561 | warnx("malloc failed"); |
| 562 | return (NULL); |
| 563 | } |
| 564 | } |
| 565 | |
| 566 | if (cnt == 0 || |
| 567 | (str = malloc(sizeof(char) * (32 * cnt + cnt + 2))) == NULL) { |
| 568 | if (cnt > 0) |
| 569 | warnx("malloc failed"); |
| 570 | free(listptr); |
| 571 | return (NULL); |
| 572 | } |
| 573 | |
| 574 | *str = 'n'; *(str + 1) = 'o'; |
| 575 | for (i = 0, strptr = str + 2; i < cnt; i++, strptr++) { |
| 576 | strncpy(strptr, listptr[i], 32); |
| 577 | strptr += strlen(listptr[i]); |
| 578 | *strptr = ','; |
| 579 | free(listptr[i]); |
| 580 | } |
| 581 | *(--strptr) = '\0'; |
| 582 | |
| 583 | free(listptr); |
| 584 | return (str); |
| 585 | } |