1 /*- 2 * Copyright (c) 1980, 1989, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) Copyright (c) 1980, 1989, 1993, 1994 The Regents of the University of California. All rights reserved. 34 * @(#)mount.c 8.25 (Berkeley) 5/8/95 35 * $FreeBSD: src/sbin/mount/mount.c,v 1.39.2.3 2001/08/01 08:26:23 obrien Exp $ 36 * $DragonFly: src/sbin/mount/mount.c,v 1.10 2005/04/03 17:13:08 joerg Exp $ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/mount.h> 41 #include <sys/mountctl.h> 42 #include <sys/stat.h> 43 #include <sys/wait.h> 44 45 #include <err.h> 46 #include <errno.h> 47 #include <fstab.h> 48 #include <pwd.h> 49 #include <signal.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 55 #include "extern.h" 56 #include "mntopts.h" 57 #include "pathnames.h" 58 59 /* `meta' options */ 60 #define MOUNT_META_OPTION_FSTAB "fstab" 61 #define MOUNT_META_OPTION_CURRENT "current" 62 63 int debug, fstab_style, verbose; 64 65 static char *catopt(char *, const char *); 66 static struct statfs 67 *getmntpt(const char *); 68 static int hasopt(const char *, const char *); 69 static int ismounted(struct fstab *, struct statfs *, int); 70 static int isremountable(const char *); 71 static void mangle(char *, int *, const char **); 72 static char *update_options(char *, char *, int); 73 static int mountfs(const char *, const char *, const char *, 74 int, const char *, const char *); 75 static void remopt(char *, const char *); 76 static void printdefvals(const struct statfs *); 77 static void prmount(struct statfs *); 78 static void putfsent(const struct statfs *); 79 static void usage(void); 80 static char *flags2opts(int); 81 static char *xstrdup(const char *str); 82 83 /* 84 * List of VFS types that can be remounted without becoming mounted on top 85 * of each other. 86 * XXX Is this list correct? 87 */ 88 static const char * 89 remountable_fs_names[] = { 90 "ufs", "ffs", "ext2fs", 91 0 92 }; 93 94 int 95 main(int argc, char **argv) 96 { 97 const char *mntfromname, **vfslist, *vfstype; 98 struct fstab *fs; 99 struct statfs *mntbuf; 100 FILE *mountdfp; 101 pid_t pid; 102 int all, ch, i, init_flags, mntsize, rval, have_fstab; 103 char *options; 104 105 all = init_flags = 0; 106 options = NULL; 107 vfslist = NULL; 108 vfstype = "ufs"; 109 while ((ch = getopt(argc, argv, "adfo:prwt:uv")) != -1) 110 switch (ch) { 111 case 'a': 112 all = 1; 113 break; 114 case 'd': 115 debug = 1; 116 break; 117 case 'f': 118 init_flags |= MNT_FORCE; 119 break; 120 case 'o': 121 if (*optarg) 122 options = catopt(options, optarg); 123 break; 124 case 'p': 125 fstab_style = 1; 126 verbose = 1; 127 break; 128 case 'r': 129 options = catopt(options, "ro"); 130 break; 131 case 't': 132 if (vfslist != NULL) 133 errx(1, "only one -t option may be specified"); 134 vfslist = makevfslist(optarg); 135 vfstype = optarg; 136 break; 137 case 'u': 138 init_flags |= MNT_UPDATE; 139 break; 140 case 'v': 141 verbose = 1; 142 break; 143 case 'w': 144 options = catopt(options, "noro"); 145 break; 146 case '?': 147 default: 148 usage(); 149 /* NOTREACHED */ 150 } 151 argc -= optind; 152 argv += optind; 153 154 #define BADTYPE(type) \ 155 (strcmp(type, FSTAB_RO) && \ 156 strcmp(type, FSTAB_RW) && strcmp(type, FSTAB_RQ)) 157 158 rval = 0; 159 switch (argc) { 160 case 0: 161 if ((mntsize = getmntinfo(&mntbuf, MNT_NOWAIT)) == 0) 162 err(1, "getmntinfo"); 163 if (all) { 164 while ((fs = getfsent()) != NULL) { 165 if (BADTYPE(fs->fs_type)) 166 continue; 167 if (checkvfsname(fs->fs_vfstype, vfslist)) 168 continue; 169 if (hasopt(fs->fs_mntops, "noauto")) 170 continue; 171 if (!(init_flags & MNT_UPDATE) && 172 ismounted(fs, mntbuf, mntsize)) 173 continue; 174 options = update_options(options, 175 fs->fs_mntops, mntbuf->f_flags); 176 if (mountfs(fs->fs_vfstype, fs->fs_spec, 177 fs->fs_file, init_flags, options, 178 fs->fs_mntops)) 179 rval = 1; 180 } 181 } else if (fstab_style) { 182 for (i = 0; i < mntsize; i++) { 183 if (checkvfsname(mntbuf[i].f_fstypename, vfslist)) 184 continue; 185 putfsent(&mntbuf[i]); 186 } 187 } else { 188 for (i = 0; i < mntsize; i++) { 189 if (checkvfsname(mntbuf[i].f_fstypename, 190 vfslist)) 191 continue; 192 prmount(&mntbuf[i]); 193 } 194 } 195 exit(rval); 196 case 1: 197 if (vfslist != NULL) 198 usage(); 199 200 rmslashes(*argv, *argv); 201 202 if (init_flags & MNT_UPDATE) { 203 mntfromname = NULL; 204 have_fstab = 0; 205 if ((mntbuf = getmntpt(*argv)) == NULL) 206 errx(1, "not currently mounted %s", *argv); 207 /* 208 * Only get the mntflags from fstab if both mntpoint 209 * and mntspec are identical. Also handle the special 210 * case where just '/' is mounted and 'spec' is not 211 * identical with the one from fstab ('/dev' is missing 212 * in the spec-string at boot-time). 213 */ 214 if ((fs = getfsfile(mntbuf->f_mntonname)) != NULL) { 215 if (strcmp(fs->fs_spec, 216 mntbuf->f_mntfromname) == 0 && 217 strcmp(fs->fs_file, 218 mntbuf->f_mntonname) == 0) { 219 have_fstab = 1; 220 mntfromname = mntbuf->f_mntfromname; 221 } else if (argv[0][0] == '/' && 222 argv[0][1] == '\0') { 223 fs = getfsfile("/"); 224 have_fstab = 1; 225 mntfromname = fs->fs_spec; 226 } 227 } 228 if (have_fstab) { 229 options = update_options(options, fs->fs_mntops, 230 mntbuf->f_flags); 231 } else { 232 mntfromname = mntbuf->f_mntfromname; 233 options = update_options(options, NULL, 234 mntbuf->f_flags); 235 } 236 rval = mountfs(mntbuf->f_fstypename, mntfromname, 237 mntbuf->f_mntonname, init_flags, options, 0); 238 break; 239 } 240 if ((fs = getfsfile(*argv)) == NULL && 241 (fs = getfsspec(*argv)) == NULL) 242 errx(1, "%s: unknown special file or file system", 243 *argv); 244 if (BADTYPE(fs->fs_type)) 245 errx(1, "%s has unknown file system type", 246 *argv); 247 rval = mountfs(fs->fs_vfstype, fs->fs_spec, fs->fs_file, 248 init_flags, options, fs->fs_mntops); 249 break; 250 case 2: 251 /* 252 * If -t flag has not been specified, the path cannot be 253 * found, spec contains either a ':' or a '@', and the 254 * spec is not a file with those characters, then assume 255 * that an NFS filesystem is being specified ala Sun. 256 */ 257 if (vfslist == NULL && strpbrk(argv[0], ":@") != NULL && 258 access(argv[0], 0) == -1) 259 vfstype = "nfs"; 260 rval = mountfs(vfstype, getdevpath(argv[0], 0), argv[1], 261 init_flags, options, NULL); 262 break; 263 default: 264 usage(); 265 /* NOTREACHED */ 266 } 267 268 /* 269 * If the mount was successfully, and done by root, tell mountd the 270 * good news. Pid checks are probably unnecessary, but don't hurt. 271 */ 272 if (rval == 0 && getuid() == 0 && 273 (mountdfp = fopen(_PATH_MOUNTDPID, "r")) != NULL) { 274 if (fscanf(mountdfp, "%d", &pid) == 1 && 275 pid > 0 && kill(pid, SIGHUP) == -1 && errno != ESRCH) 276 err(1, "signal mountd"); 277 fclose(mountdfp); 278 } 279 280 exit(rval); 281 } 282 283 static int 284 ismounted(struct fstab *fs, struct statfs *mntbuf, int mntsize) 285 { 286 int i; 287 288 if (fs->fs_file[0] == '/' && fs->fs_file[1] == '\0') 289 /* the root file system can always be remounted */ 290 return (0); 291 292 for (i = mntsize - 1; i >= 0; --i) 293 if (strcmp(fs->fs_file, mntbuf[i].f_mntonname) == 0 && 294 (!isremountable(fs->fs_vfstype) || 295 strcmp(fs->fs_spec, mntbuf[i].f_mntfromname) == 0)) 296 return (1); 297 return (0); 298 } 299 300 static int 301 isremountable(const char *vfsname) 302 { 303 const char **cp; 304 305 for (cp = remountable_fs_names; *cp; cp++) 306 if (strcmp(*cp, vfsname) == 0) 307 return (1); 308 return (0); 309 } 310 311 static int 312 hasopt(const char *mntopts, const char *option) 313 { 314 int negative, found; 315 char *opt, *optbuf; 316 317 if (option[0] == 'n' && option[1] == 'o') { 318 negative = 1; 319 option += 2; 320 } else 321 negative = 0; 322 optbuf = xstrdup(mntopts); 323 found = 0; 324 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 325 if (opt[0] == 'n' && opt[1] == 'o') { 326 if (!strcasecmp(opt + 2, option)) 327 found = negative; 328 } else if (!strcasecmp(opt, option)) 329 found = !negative; 330 } 331 free(optbuf); 332 return (found); 333 } 334 335 static int 336 mountfs(const char *vfstype, const char *spec, const char *name, int flags, 337 const char *options, const char *mntopts) 338 { 339 /* List of directories containing mount_xxx subcommands. */ 340 static const char *edirs[] = { 341 _PATH_SBIN, 342 _PATH_USRSBIN, 343 NULL 344 }; 345 const char *argv[100], **edir; 346 struct statfs sf; 347 pid_t pid; 348 int argc, i, status; 349 char *optbuf, execname[MAXPATHLEN + 1], mntpath[MAXPATHLEN]; 350 351 #if __GNUC__ 352 (void)&optbuf; 353 (void)&name; 354 #endif 355 356 /* resolve the mountpoint with realpath(3) */ 357 checkpath(name, mntpath); 358 name = mntpath; 359 360 if (mntopts == NULL) 361 mntopts = ""; 362 if (options == NULL) { 363 if (*mntopts == '\0') { 364 options = "rw"; 365 } else { 366 options = mntopts; 367 mntopts = ""; 368 } 369 } 370 optbuf = catopt(xstrdup(mntopts), options); 371 372 if (strcmp(name, "/") == 0) 373 flags |= MNT_UPDATE; 374 if (flags & MNT_FORCE) 375 optbuf = catopt(optbuf, "force"); 376 if (flags & MNT_RDONLY) 377 optbuf = catopt(optbuf, "ro"); 378 /* 379 * XXX 380 * The mount_mfs (newfs) command uses -o to select the 381 * optimization mode. We don't pass the default "-o rw" 382 * for that reason. 383 */ 384 if (flags & MNT_UPDATE) 385 optbuf = catopt(optbuf, "update"); 386 387 argc = 0; 388 argv[argc++] = vfstype; 389 mangle(optbuf, &argc, argv); 390 argv[argc++] = spec; 391 argv[argc++] = name; 392 argv[argc] = NULL; 393 394 if (debug) { 395 printf("exec: mount_%s", vfstype); 396 for (i = 1; i < argc; i++) 397 printf(" %s", argv[i]); 398 printf("\n"); 399 return (0); 400 } 401 402 switch (pid = fork()) { 403 case -1: /* Error. */ 404 warn("fork"); 405 free(optbuf); 406 return (1); 407 case 0: /* Child. */ 408 if (strcmp(vfstype, "ufs") == 0) 409 exit(mount_ufs(argc, argv)); 410 411 /* Go find an executable. */ 412 for (edir = edirs; *edir; edir++) { 413 snprintf(execname, 414 sizeof(execname), "%s/mount_%s", *edir, vfstype); 415 execv(execname, __DECONST(char * const *, argv)); 416 } 417 if (errno == ENOENT) { 418 int len = 0; 419 char *cp; 420 for (edir = edirs; *edir; edir++) 421 len += strlen(*edir) + 2; /* ", " */ 422 if ((cp = malloc(len)) == NULL) 423 errx(1, "malloc failed"); 424 cp[0] = '\0'; 425 for (edir = edirs; *edir; edir++) { 426 strcat(cp, *edir); 427 if (edir[1] != NULL) 428 strcat(cp, ", "); 429 } 430 warn("exec mount_%s not found in %s", vfstype, cp); 431 } 432 exit(1); 433 /* NOTREACHED */ 434 default: /* Parent. */ 435 free(optbuf); 436 437 if (waitpid(pid, &status, 0) < 0) { 438 warn("waitpid"); 439 return (1); 440 } 441 442 if (WIFEXITED(status)) { 443 if (WEXITSTATUS(status) != 0) 444 return (WEXITSTATUS(status)); 445 } else if (WIFSIGNALED(status)) { 446 warnx("%s: %s", name, sys_siglist[WTERMSIG(status)]); 447 return (1); 448 } 449 450 if (verbose) { 451 if (statfs(name, &sf) < 0) { 452 warn("statfs %s", name); 453 return (1); 454 } 455 if (fstab_style) 456 putfsent(&sf); 457 else 458 prmount(&sf); 459 } 460 break; 461 } 462 463 return (0); 464 } 465 466 static void 467 prmount(struct statfs *sfp) 468 { 469 struct passwd *pw; 470 char *buf; 471 int error; 472 int len; 473 474 error = 0; 475 len = 256; 476 477 if ((buf = malloc(len)) == NULL) 478 errx(1, "malloc failed"); 479 480 printf("%s on %s (%s", sfp->f_mntfromname, sfp->f_mntonname, 481 sfp->f_fstypename); 482 483 /* Get a string buffer with all the used flags names */ 484 error = mountctl(sfp->f_mntonname, MOUNTCTL_MOUNTFLAGS, 485 -1, NULL, 0, buf, len); 486 487 if (sfp->f_owner) { 488 printf(", mounted by "); 489 if ((pw = getpwuid(sfp->f_owner)) != NULL) 490 printf("%s", pw->pw_name); 491 else 492 printf("%d", sfp->f_owner); 493 } 494 495 if (strlen(buf)) 496 printf(", %s", buf); 497 498 if (verbose) { 499 if (sfp->f_syncwrites != 0 || sfp->f_asyncwrites != 0) 500 printf(", writes: sync %ld async %ld", 501 sfp->f_syncwrites, sfp->f_asyncwrites); 502 if (sfp->f_syncreads != 0 || sfp->f_asyncreads != 0) 503 printf(", reads: sync %ld async %ld", 504 sfp->f_syncreads, sfp->f_asyncreads); 505 } 506 printf(")\n"); 507 } 508 509 static struct statfs * 510 getmntpt(const char *name) 511 { 512 struct statfs *mntbuf; 513 int i, mntsize; 514 515 mntsize = getmntinfo(&mntbuf, MNT_NOWAIT); 516 for (i = mntsize - 1; i >= 0; i--) { 517 if (strcmp(mntbuf[i].f_mntfromname, name) == 0 || 518 strcmp(mntbuf[i].f_mntonname, name) == 0) 519 return (&mntbuf[i]); 520 } 521 return (NULL); 522 } 523 524 static char * 525 catopt(char *s0, const char *s1) 526 { 527 size_t i; 528 char *cp; 529 530 if (s1 == NULL || *s1 == '\0') 531 return s0; 532 533 if (s0 && *s0) { 534 i = strlen(s0) + strlen(s1) + 1 + 1; 535 if ((cp = malloc(i)) == NULL) 536 errx(1, "malloc failed"); 537 snprintf(cp, i, "%s,%s", s0, s1); 538 } else 539 cp = xstrdup(s1); 540 541 if (s0) 542 free(s0); 543 return (cp); 544 } 545 546 static void 547 mangle(char *options, int *argcp, const char **argv) 548 { 549 char *p, *s; 550 int argc; 551 552 argc = *argcp; 553 for (s = options; (p = strsep(&s, ",")) != NULL;) 554 if (*p != '\0') { 555 if (*p == '-') { 556 argv[argc++] = p; 557 p = strchr(p, '='); 558 if (p) { 559 *p = '\0'; 560 argv[argc++] = p+1; 561 } 562 } else if (strcmp(p, "rw") != 0) { 563 argv[argc++] = "-o"; 564 argv[argc++] = p; 565 } 566 } 567 568 *argcp = argc; 569 } 570 571 572 static char * 573 update_options(char *opts, char *fstab, int curflags) 574 { 575 char *o, *p; 576 char *cur; 577 char *expopt, *newopt, *tmpopt; 578 579 if (opts == NULL) 580 return xstrdup(""); 581 582 /* remove meta options from list */ 583 remopt(fstab, MOUNT_META_OPTION_FSTAB); 584 remopt(fstab, MOUNT_META_OPTION_CURRENT); 585 cur = flags2opts(curflags); 586 587 /* 588 * Expand all meta-options passed to us first. 589 */ 590 expopt = NULL; 591 for (p = opts; (o = strsep(&p, ",")) != NULL;) { 592 if (strcmp(MOUNT_META_OPTION_FSTAB, o) == 0) 593 expopt = catopt(expopt, fstab); 594 else if (strcmp(MOUNT_META_OPTION_CURRENT, o) == 0) 595 expopt = catopt(expopt, cur); 596 else 597 expopt = catopt(expopt, o); 598 } 599 free(cur); 600 free(opts); 601 602 /* 603 * Remove previous contradictory arguments. Given option "foo" we 604 * remove all the "nofoo" options. Given "nofoo" we remove "nonofoo" 605 * and "foo" - so we can deal with possible options like "notice". 606 */ 607 newopt = NULL; 608 for (p = expopt; (o = strsep(&p, ",")) != NULL;) { 609 if ((tmpopt = malloc( strlen(o) + 2 + 1 )) == NULL) 610 errx(1, "malloc failed"); 611 612 strcpy(tmpopt, "no"); 613 strcat(tmpopt, o); 614 remopt(newopt, tmpopt); 615 free(tmpopt); 616 617 if (strncmp("no", o, 2) == 0) 618 remopt(newopt, o+2); 619 620 newopt = catopt(newopt, o); 621 } 622 free(expopt); 623 624 return newopt; 625 } 626 627 static void 628 remopt(char *string, const char *opt) 629 { 630 char *o, *p, *r; 631 632 if (string == NULL || *string == '\0' || opt == NULL || *opt == '\0') 633 return; 634 635 r = string; 636 637 for (p = string; (o = strsep(&p, ",")) != NULL;) { 638 if (strcmp(opt, o) != 0) { 639 if (*r == ',' && *o != '\0') 640 r++; 641 while ((*r++ = *o++) != '\0') 642 ; 643 *--r = ','; 644 } 645 } 646 *r = '\0'; 647 } 648 649 static void 650 usage(void) 651 { 652 653 fprintf(stderr, "%s\n%s\n%s\n", 654 "usage: mount [-dfpruvw] [-o options] [-t ufs | external_type] special node", 655 " mount [-adfpruvw] [-o options] [-t ufs | external_type]", 656 " mount [-dfpruvw] special | node"); 657 exit(1); 658 } 659 660 /* 661 * Prints the default values for dump frequency and pass number of fsck. 662 * This happens when mount(8) is called with -p and there is no fstab file 663 * or there is but the values aren't specified. 664 */ 665 static void 666 printdefvals(const struct statfs *ent) 667 { 668 if (strcmp(ent->f_fstypename, "ufs") == 0) { 669 if (strcmp(ent->f_mntonname, "/") == 0) 670 printf("\t1 1\n"); 671 else 672 printf("\t2 2\n"); 673 } else { 674 printf("\t0 0\n"); 675 } 676 } 677 678 static void 679 putfsent(const struct statfs *ent) 680 { 681 struct stat sb; 682 struct fstab *fst; 683 char *opts; 684 685 opts = flags2opts(ent->f_flags); 686 printf("%s\t%s\t%s %s", ent->f_mntfromname, ent->f_mntonname, 687 ent->f_fstypename, opts); 688 free(opts); 689 690 /* 691 * If fstab file is missing don't call getfsspec() or getfsfile() 692 * at all, because the same warning will be printed twice for every 693 * mounted filesystem. 694 */ 695 if (stat(_PATH_FSTAB, &sb) != -1) { 696 if ((fst = getfsspec(ent->f_mntfromname))) 697 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno); 698 else if ((fst = getfsfile(ent->f_mntonname))) 699 printf("\t%u %u\n", fst->fs_freq, fst->fs_passno); 700 else 701 printdefvals(ent); 702 } else { 703 printdefvals(ent); 704 } 705 } 706 707 708 static char * 709 flags2opts(int flags) 710 { 711 char *res; 712 713 res = NULL; 714 715 res = catopt(res, (flags & MNT_RDONLY) ? "ro" : "rw"); 716 717 if (flags & MNT_SYNCHRONOUS) res = catopt(res, "sync"); 718 if (flags & MNT_NOEXEC) res = catopt(res, "noexec"); 719 if (flags & MNT_NOSUID) res = catopt(res, "nosuid"); 720 if (flags & MNT_NODEV) res = catopt(res, "nodev"); 721 if (flags & MNT_UNION) res = catopt(res, "union"); 722 if (flags & MNT_ASYNC) res = catopt(res, "async"); 723 if (flags & MNT_NOATIME) res = catopt(res, "noatime"); 724 if (flags & MNT_NOCLUSTERR) res = catopt(res, "noclusterr"); 725 if (flags & MNT_NOCLUSTERW) res = catopt(res, "noclusterw"); 726 if (flags & MNT_NOSYMFOLLOW) res = catopt(res, "nosymfollow"); 727 if (flags & MNT_SUIDDIR) res = catopt(res, "suiddir"); 728 if (flags & MNT_IGNORE) res = catopt(res, "ignore"); 729 730 return res; 731 } 732 733 static char* 734 xstrdup(const char *str) 735 { 736 char* ret = strdup(str); 737 if(ret == NULL) { 738 errx(1, "strdup failed (could not allocate memory)"); 739 } 740 return ret; 741 } 742