config.c

   1 /*
   2  * mdadm - manage Linux "md" devices aka RAID arrays.
   3  *
   4  * Copyright (C) 2001-2002 Neil Brown <neilb@cse.unsw.edu.au>
   5  *
   6  *
   7  *    This program is free software; you can redistribute it and/or modify
   8  *    it under the terms of the GNU General Public License as published by
   9  *    the Free Software Foundation; either version 2 of the License, or
  10  *    (at your option) any later version.
  11  *
  12  *    This program is distributed in the hope that it will be useful,
  13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *    GNU General Public License for more details.
  16  *
  17  *    You should have received a copy of the GNU General Public License
  18  *    along with this program; if not, write to the Free Software
  19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  *    Author: Neil Brown
  22  *    Email: <neilb@cse.unsw.edu.au>
  23  *    Paper: Neil Brown
  24  *           School of Computer Science and Engineering
  25  *           The University of New South Wales
  26  *           Sydney, 2052
  27  *           Australia
  28  */
  29
  30 #include        "mdadm.h"
  31 #include        "dlink.h"
  32 #include        <sys/dir.h>
  33 #include        <glob.h>
  34 #include        <fnmatch.h>
  35 #include        <ctype.h>
  36 #include        <pwd.h>
  37 #include        <grp.h>
  38
  39 /*
  40  * Read the config file
  41  *
  42  * conf_get_uuids gets a list of devicename+uuid pairs
  43  * conf_get_devs gets device names after expanding wildcards
  44  *
  45  * Each keeps the returned list and frees it when asked to make
  46  * a new list.
  47  *
  48  * The format of the config file needs to be fairly extensible.
  49  * Now, arrays only have names and uuids and devices merely are.
  50  * But later arrays might want names, and devices might want superblock
  51  * versions, and who knows what else.
  52  * I like free format, abhore backslash line continuation, adore
  53  *   indentation for structure and am ok about # comments.
  54  *
  55  * So, each line that isn't blank or a #comment must either start
  56  *  with a key word, and not be indented, or must start with a
  57  *  non-key-word and must be indented.
  58  *
  59  * Keywords are DEVICE and ARRAY
  60  * DEV{ICE} introduces some devices that might contain raid components.
  61  * e.g.
  62  *   DEV style=0 /dev/sda* /dev/hd*
  63  *   DEV style=1 /dev/sd[b-f]*
  64  * ARR{AY} describes an array giving md device and attributes like uuid=whatever
  65  * e.g.
  66  *   ARRAY /dev/md0 uuid=whatever name=something
  67  * Spaces separate words on each line.  Quoting, with "" or '' protects them,
  68  * but may not wrap over lines
  69  *
  70  */
  71
  72 #ifndef CONFFILE
  73 #define CONFFILE "/etc/mdadm.conf"
  74 #endif
  75 #ifndef CONFFILE2
  76 /* for Debian compatibility .... */
  77 #define CONFFILE2 "/etc/mdadm/mdadm.conf"
  78 #endif
  79 char DefaultConfFile[] = CONFFILE;
  80 char DefaultAltConfFile[] = CONFFILE2;
  81
  82 char *keywords[] = { "devices", "array",
  83                      "mailaddr", "program", "mailfrom",
  84                      "create",
  85                      NULL };
  86
  87 /*
  88  * match_keyword returns an index into the keywords array, or -1 for no match
  89  * case is ignored, and at least three characters must be given
  90  */
  91
  92 int match_keyword(char *word)
  93 {
  94         int len = strlen(word);
  95         int n;
  96
  97         if (len < 3) return -1;
  98         for (n=0; keywords[n]; n++) {
  99                 if (strncasecmp(word, keywords[n], len)==0)
 100                         return n;
 101         }
 102         return -1;
 103 }
 104
 105 /* conf_word gets one word from the conf file.
 106  * if "allow_key", then accept words at the start of a line,
 107  * otherwise stop when such a word is found.
 108  * We assume that the file pointer is at the end of a word, so the
 109  * next character is a space, or a newline.  If not, it is the start of a line.
 110  */
 111
 112 char *conf_word(FILE *file, int allow_key)
 113 {
 114         int wsize = 100;
 115         int len = 0;
 116         int c;
 117         int quote;
 118         int wordfound = 0;
 119         char *word = malloc(wsize);
 120
 121         if (!word) abort();
 122
 123         while (wordfound==0) {
 124                 /* at the end of a word.. */
 125                 c = getc(file);
 126                 if (c == '#')
 127                         while (c != EOF && c != '\n')
 128                                 c = getc(file);
 129                 if (c == EOF) break;
 130                 if (c == '\n') continue;
 131
 132                 if (c != ' ' && c != '\t' && ! allow_key) {
 133                         ungetc(c, file);
 134                         break;
 135                 }
 136                 /* looks like it is safe to get a word here, if there is one */
 137                 quote = 0;
 138                 /* first, skip any spaces */
 139                 while (c == ' ' || c == '\t')
 140                         c = getc(file);
 141                 if (c != EOF && c != '\n' && c != '#') {
 142                         /* we really have a character of a word, so start saving it */
 143                         while (c != EOF && c != '\n' && (quote || (c!=' ' && c != '\t'))) {
 144                                 wordfound = 1;
 145                                 if (quote && c == quote) quote = 0;
 146                                 else if (quote == 0 && (c == '\'' || c == '"'))
 147                                         quote = c;
 148                                 else {
 149                                         if (len == wsize-1) {
 150                                                 wsize += 100;
 151                                                 word = realloc(word, wsize);
 152                                                 if (!word) abort();
 153                                         }
 154                                         word[len++] = c;
 155                                 }
 156                                 c = getc(file);
 157                         }
 158                 }
 159                 if (c != EOF) ungetc(c, file);
 160         }
 161         word[len] = 0;
 162 /*    printf("word is <%s>\n", word); */
 163         if (!wordfound) {
 164                 free(word);
 165                 word = NULL;
 166         }
 167         return word;
 168 }
 169
 170 /*
 171  * conf_line reads one logical line from the conffile.
 172  * It skips comments and continues until it finds a line that starts
 173  * with a non blank/comment.  This character is pushed back for the next call
 174  * A doubly linked list of words is returned.
 175  * the first word will be a keyword.  Other words will have had quotes removed.
 176  */
 177
 178 char *conf_line(FILE *file)
 179 {
 180         char *w;
 181         char *list;
 182
 183         w = conf_word(file, 1);
 184         if (w == NULL) return NULL;
 185
 186         list = dl_strdup(w);
 187         free(w);
 188         dl_init(list);
 189
 190         while ((w = conf_word(file,0))){
 191                 char *w2 = dl_strdup(w);
 192                 free(w);
 193                 dl_add(list, w2);
 194         }
 195 /*    printf("got a line\n");*/
 196         return list;
 197 }
 198
 199 void free_line(char *line)
 200 {
 201         char *w;
 202         for (w=dl_next(line); w != line; w=dl_next(line)) {
 203                 dl_del(w);
 204                 dl_free(w);
 205         }
 206         dl_free(line);
 207 }
 208
 209
 210 struct conf_dev {
 211     struct conf_dev *next;
 212     char *name;
 213 } *cdevlist = NULL;
 214
 215 mddev_dev_t load_partitions(void)
 216 {
 217         FILE *f = fopen("/proc/partitions", "r");
 218         char buf[1024];
 219         mddev_dev_t rv = NULL;
 220         if (f == NULL) {
 221                 fprintf(stderr, Name ": cannot open /proc/partitions\n");
 222                 return NULL;
 223         }
 224         while (fgets(buf, 1024, f)) {
 225                 int major, minor;
 226                 char *name, *mp;
 227                 mddev_dev_t d;
 228
 229                 buf[1023] = '\0';
 230                 if (buf[0] != ' ')
 231                         continue;
 232                 major = strtoul(buf, &mp, 10);
 233                 if (mp == buf || *mp != ' ')
 234                         continue;
 235                 minor = strtoul(mp, NULL, 10);
 236
 237                 name = map_dev(major, minor, 1);
 238
 239                 d = malloc(sizeof(*d));
 240                 d->devname = strdup(name);
 241                 d->next = rv;
 242                 rv = d;
 243         }
 244         fclose(f);
 245         return rv;
 246 }
 247
 248 struct createinfo createinfo = {
 249 #ifdef DEBIAN
 250         .gid = 6, /* disk */
 251         .mode = 0660,
 252 #else
 253         .mode = 0600,
 254 #endif
 255 };
 256
 257 int parse_auto(char *str, char *msg)
 258 {
 259         int autof;
 260         if (str == NULL || *str == 0)
 261                 autof = -2;
 262         else if (strcasecmp(str,"no")==0)
 263                 autof = -3;
 264         else if (strcasecmp(str,"yes")==0)
 265                 autof = -2;
 266         else if (strcasecmp(str,"md")==0)
 267                 autof = -1;
 268         else {
 269                 /* There might be digits, and maybe a hypen, at the end */
 270                 char *e = str + strlen(str);
 271                 int num = 4;
 272                 int len;
 273                 while (e > str && isdigit(e[-1]))
 274                         e--;
 275                 if (*e) {
 276                         num = atoi(e);
 277                         if (num <= 0) num = 1;
 278                 }
 279                 if (e > str && e[-1] == '-')
 280                         e--;
 281                 len = e - str;
 282                 if ((len == 3 && strncasecmp(str,"mdp",3)==0) ||
 283                     (len == 1 && strncasecmp(str,"p",1)==0) ||
 284                     (len >= 4 && strncasecmp(str,"part",4)==0))
 285                         autof = num;
 286                 else {
 287                         fprintf(stderr, Name ": %s arg of \"%s\" unrecognised: use no,yes,md,mdp,part\n"
 288                                 "        optionally followed by a number.\n",
 289                                 msg, str);
 290                         exit(2);
 291                 }
 292         }
 293         return autof;
 294 }
 295 static void createline(char *line)
 296 {
 297         char *w;
 298         char *ep;
 299
 300         for (w=dl_next(line); w!=line; w=dl_next(w)) {
 301                 if (strncasecmp(w, "auto=", 5) == 0)
 302                         createinfo.autof = parse_auto(w+5, "auto=");
 303                 else if (strncasecmp(w, "owner=", 6) == 0) {
 304                         if (w[6] == 0) {
 305                                 fprintf(stderr, Name ": missing owner name\n");
 306                                 continue;
 307                         }
 308                         createinfo.uid = strtoul(w+6, &ep, 10);
 309                         if (*ep != 0) {
 310 #ifndef STATIC
 311                                 struct passwd *pw;
 312                                 /* must be a name */
 313                                 pw = getpwnam(w+6);
 314                                 if (pw)
 315                                         createinfo.uid = pw->pw_uid;
 316                                 else
 317 #endif /* STATIC */
 318                                         fprintf(stderr, Name ": CREATE user %s not found\n", w+6);
 319                         }
 320                 } else if (strncasecmp(w, "group=", 6) == 0) {
 321                         if (w[6] == 0) {
 322                                 fprintf(stderr, Name ": missing group name\n");
 323                                 continue;
 324                         }
 325                         createinfo.gid = strtoul(w+6, &ep, 10);
 326                         if (*ep != 0) {
 327 #ifndef STATIC
 328                                 struct group *gr;
 329                                 /* must be a name */
 330                                 gr = getgrnam(w+6);
 331                                 if (gr)
 332                                         createinfo.gid = gr->gr_gid;
 333                                 else
 334 #endif /* STATIC */
 335                                         fprintf(stderr, Name ": CREATE group %s not found\n", w+6);
 336                         }
 337                 } else if (strncasecmp(w, "mode=", 5) == 0) {
 338                         if (w[5] == 0) {
 339                                 fprintf(stderr, Name ": missing CREATE mode\n");
 340                                 continue;
 341                         }
 342                         createinfo.mode = strtoul(w+5, &ep, 8);
 343                         if (*ep != 0) {
 344                                 createinfo.mode = 0600;
 345                                 fprintf(stderr, Name ": unrecognised CREATE mode %s\n",
 346                                         w+5);
 347                         }
 348                 } else {
 349                         fprintf(stderr, Name ": unrecognised word on CREATE line: %s\n",
 350                                 w);
 351                 }
 352         }
 353 }
 354
 355 void devline(char *line)
 356 {
 357         char *w;
 358         struct conf_dev *cd;
 359
 360         for (w=dl_next(line); w != line; w=dl_next(w)) {
 361                 if (w[0] == '/' || strcasecmp(w, "partitions") == 0) {
 362                         cd = malloc(sizeof(*cd));
 363                         cd->name = strdup(w);
 364                         cd->next = cdevlist;
 365                         cdevlist = cd;
 366                 } else {
 367                         fprintf(stderr, Name ": unreconised word on DEVICE line: %s\n",
 368                                 w);
 369                 }
 370         }
 371 }
 372
 373 mddev_ident_t mddevlist = NULL;
 374 mddev_ident_t *mddevlp = &mddevlist;
 375
 376 void arrayline(char *line)
 377 {
 378         char *w;
 379
 380         struct mddev_ident_s mis;
 381         mddev_ident_t mi;
 382
 383         mis.uuid_set = 0;
 384         mis.super_minor = UnSet;
 385         mis.level = UnSet;
 386         mis.raid_disks = UnSet;
 387         mis.spare_disks = 0;
 388         mis.devices = NULL;
 389         mis.devname = NULL;
 390         mis.spare_group = NULL;
 391         mis.autof = 0;
 392         mis.next = NULL;
 393         mis.st = NULL;
 394         mis.bitmap_fd = -1;
 395         mis.bitmap_file = NULL;
 396         mis.name[0] = 0;
 397
 398         for (w=dl_next(line); w!=line; w=dl_next(w)) {
 399                 if (w[0] == '/') {
 400                         if (mis.devname)
 401                                 fprintf(stderr, Name ": only give one device per ARRAY line: %s and %s\n",
 402                                         mis.devname, w);
 403                         else mis.devname = w;
 404                 } else if (strncasecmp(w, "uuid=", 5)==0 ) {
 405                         if (mis.uuid_set)
 406                                 fprintf(stderr, Name ": only specify uuid once, %s ignored.\n",
 407                                         w);
 408                         else {
 409                                 if (parse_uuid(w+5, mis.uuid))
 410                                         mis.uuid_set = 1;
 411                                 else
 412                                         fprintf(stderr, Name ": bad uuid: %s\n", w);
 413                         }
 414                 } else if (strncasecmp(w, "super-minor=", 12)==0 ) {
 415                         if (mis.super_minor != UnSet)
 416                                 fprintf(stderr, Name ": only specify super-minor once, %s ignored.\n",
 417                                         w);
 418                         else {
 419                                 char *endptr;
 420                                 mis.super_minor= strtol(w+12, &endptr, 10);
 421                                 if (w[12]==0 || endptr[0]!=0 || mis.super_minor < 0) {
 422                                         fprintf(stderr, Name ": invalid super-minor number: %s\n",
 423                                                 w);
 424                                         mis.super_minor = UnSet;
 425                                 }
 426                         }
 427                 } else if (strncasecmp(w, "name=", 5)==0) {
 428                         if (mis.name[0])
 429                                 fprintf(stderr, Name ": only specify name once, %s ignored.\n",
 430                                         w);
 431                         else if (strlen(w+5) > 32)
 432                                 fprintf(stderr, Name ": name too long, ignoring %s\n", w);
 433                         else
 434                                 strcpy(mis.name, w+5);
 435
 436                 } else if (strncasecmp(w, "bitmap=", 7) == 0) {
 437                         if (mis.bitmap_file)
 438                                 fprintf(stderr, Name ": only specify bitmap file once. %s ignored\n",
 439                                         w);
 440                         else
 441                                 mis.bitmap_file = w+7;
 442
 443                 } else if (strncasecmp(w, "devices=", 8 ) == 0 ) {
 444                         if (mis.devices)
 445                                 fprintf(stderr, Name ": only specify devices once (use a comma separated list). %s ignored\n",
 446                                         w);
 447                         else
 448                                 mis.devices = strdup(w+8);
 449                 } else if (strncasecmp(w, "spare-group=", 12) == 0 ) {
 450                         if (mis.spare_group)
 451                                 fprintf(stderr, Name ": only specify one spare group per array. %s ignored.\n",
 452                                         w);
 453                         else
 454                                 mis.spare_group = strdup(w+12);
 455                 } else if (strncasecmp(w, "level=", 6) == 0 ) {
 456                         /* this is mainly for compatability with --brief output */
 457                         mis.level = map_name(pers, w+6);
 458                 } else if (strncasecmp(w, "disks=", 6) == 0 ) {
 459                         /* again, for compat */
 460                         mis.raid_disks = atoi(w+6);
 461                 } else if (strncasecmp(w, "num-devices=", 12) == 0 ) {
 462                         /* again, for compat */
 463                         mis.raid_disks = atoi(w+12);
 464                 } else if (strncasecmp(w, "spares=", 7) == 0 ) {
 465                         /* for warning if not all spares present */
 466                         mis.spare_disks = atoi(w+7);
 467                 } else if (strncasecmp(w, "metadata=", 9) == 0) {
 468                         /* style of metadata on the devices. */
 469                         int i;
 470
 471                         for(i=0; superlist[i] && !mis.st; i++)
 472                                 mis.st = superlist[i]->match_metadata_desc(w+9);
 473
 474                         if (!mis.st)
 475                                 fprintf(stderr, Name ": metadata format %s unknown, ignored.\n", w+9);
 476                 } else if (strncasecmp(w, "auto=", 5) == 0 ) {
 477                         /* whether to create device special files as needed */
 478                         mis.autof = parse_auto(w+5, "auto type");
 479                 } else {
 480                         fprintf(stderr, Name ": unrecognised word on ARRAY line: %s\n",
 481                                 w);
 482                 }
 483         }
 484         if (mis.devname == NULL)
 485                 fprintf(stderr, Name ": ARRAY line with no device\n");
 486         else if (mis.uuid_set == 0 && mis.devices == NULL && mis.super_minor == UnSet && mis.name[0] == 0)
 487                 fprintf(stderr, Name ": ARRAY line %s has no identity information.\n", mis.devname);
 488         else {
 489                 mi = malloc(sizeof(*mi));
 490                 *mi = mis;
 491                 mi->devname = strdup(mis.devname);
 492                 mi->next = NULL;
 493                 *mddevlp = mi;
 494                 mddevlp = &mi->next;
 495         }
 496 }
 497
 498 static char *alert_email = NULL;
 499 void mailline(char *line)
 500 {
 501         char *w;
 502
 503         for (w=dl_next(line); w != line ; w=dl_next(w)) {
 504                 if (alert_email == NULL)
 505                         alert_email = strdup(w);
 506                 else
 507                         fprintf(stderr, Name ": excess address on MAIL line: %s - ignored\n",
 508                                 w);
 509         }
 510 }
 511
 512 static char *alert_mail_from = NULL;
 513 void mailfromline(char *line)
 514 {
 515         char *w;
 516
 517         for (w=dl_next(line); w != line ; w=dl_next(w)) {
 518                 if (alert_mail_from == NULL)
 519                         alert_mail_from = strdup(w);
 520                 else {
 521                         char *t= NULL;
 522                         asprintf(&t, "%s %s", alert_mail_from, w);
 523                         free(alert_mail_from);
 524                         alert_mail_from = t;
 525                 }
 526         }
 527 }
 528
 529
 530 static char *alert_program = NULL;
 531 void programline(char *line)
 532 {
 533         char *w;
 534
 535         for (w=dl_next(line); w != line ; w=dl_next(w)) {
 536                 if (alert_program == NULL)
 537                         alert_program = strdup(w);
 538                 else
 539                         fprintf(stderr, Name ": excess program on PROGRAM line: %s - ignored\n",
 540                                 w);
 541         }
 542 }
 543
 544
 545 int loaded = 0;
 546
 547 void load_conffile(char *conffile)
 548 {
 549         FILE *f;
 550         char *line;
 551
 552         if (loaded) return;
 553         if (conffile == NULL)
 554                 conffile = DefaultConfFile;
 555
 556         if (strcmp(conffile, "none") == 0) {
 557                 loaded = 1;
 558                 return;
 559         }
 560         if (strcmp(conffile, "partitions")==0) {
 561                 char *list = dl_strdup("DEV");
 562                 dl_init(list);
 563                 dl_add(list, dl_strdup("partitions"));
 564                 devline(list);
 565                 free_line(list);
 566                 loaded = 1;
 567                 return;
 568         }
 569         f = fopen(conffile, "r");
 570         /* Debian chose to relocate mdadm.conf into /etc/mdadm/.
 571          * To allow Debian users to compile from clean source and still
 572          * have a working mdadm, we read /etc/mdadm/mdadm.conf
 573          * if /etc/mdadm.conf doesn't exist
 574          */
 575         if (f == NULL &&
 576             conffile == DefaultConfFile) {
 577                 f = fopen(DefaultAltConfFile, "r");
 578                 if (f)
 579                         conffile = DefaultAltConfFile;
 580         }
 581         if (f == NULL)
 582                 return;
 583
 584         loaded = 1;
 585         while ((line=conf_line(f))) {
 586                 switch(match_keyword(line)) {
 587                 case 0: /* DEVICE */
 588                         devline(line);
 589                         break;
 590                 case 1: /* ARRAY */
 591                         arrayline(line);
 592                         break;
 593                 case 2: /* MAIL */
 594                         mailline(line);
 595                         break;
 596                 case 3: /* PROGRAM */
 597                         programline(line);
 598                         break;
 599                 case 4: /* MAILFROM */
 600                         mailfromline(line);
 601                         break;
 602                 case 5: /* CREATE */
 603                         createline(line);
 604                         break;
 605                 default:
 606                         fprintf(stderr, Name ": Unknown keyword %s\n", line);
 607                 }
 608                 free_line(line);
 609         }
 610
 611         fclose(f);
 612
 613 /*    printf("got file\n"); */
 614 }
 615
 616 char *conf_get_mailaddr(char *conffile)
 617 {
 618         load_conffile(conffile);
 619         return alert_email;
 620 }
 621
 622 char *conf_get_mailfrom(char *conffile)
 623 {
 624         load_conffile(conffile);
 625         return alert_mail_from;
 626 }
 627
 628 char *conf_get_program(char *conffile)
 629 {
 630         load_conffile(conffile);
 631         return alert_program;
 632 }
 633
 634 struct createinfo *conf_get_create_info(char *conffile)
 635 {
 636         load_conffile(conffile);
 637         return &createinfo;
 638 }
 639
 640 mddev_ident_t conf_get_ident(char *conffile, char *dev)
 641 {
 642         mddev_ident_t rv;
 643         load_conffile(conffile);
 644         rv = mddevlist;
 645         while (dev && rv && strcmp(dev, rv->devname)!=0)
 646                 rv = rv->next;
 647         return rv;
 648 }
 649
 650 mddev_dev_t conf_get_devs(char *conffile)
 651 {
 652         glob_t globbuf;
 653         struct conf_dev *cd;
 654         int flags = 0;
 655         static mddev_dev_t dlist = NULL;
 656         unsigned int i;
 657
 658         while (dlist) {
 659                 mddev_dev_t t = dlist;
 660                 dlist = dlist->next;
 661                 free(t->devname);
 662                 free(t);
 663         }
 664
 665         load_conffile(conffile);
 666
 667         if (cdevlist == NULL)
 668                 /* default to 'partitions */
 669                 dlist = load_partitions();
 670
 671         for (cd=cdevlist; cd; cd=cd->next) {
 672                 if (strcasecmp(cd->name, "partitions")==0 && dlist == NULL)
 673                         dlist = load_partitions();
 674                 else {
 675                         glob(cd->name, flags, NULL, &globbuf);
 676                         flags |= GLOB_APPEND;
 677                 }
 678         }
 679         if (flags & GLOB_APPEND) {
 680                 for (i=0; i<globbuf.gl_pathc; i++) {
 681                         mddev_dev_t t = malloc(sizeof(*t));
 682                         t->devname = strdup(globbuf.gl_pathv[i]);
 683                         t->next = dlist;
 684                         dlist = t;
 685 /*      printf("one dev is %s\n", t->devname);*/
 686                 }
 687                 globfree(&globbuf);
 688         }
 689
 690         return dlist;
 691 }
 692
 693 int match_oneof(char *devices, char *devname)
 694 {
 695     /* check if one of the comma separated patterns in devices
 696      * matches devname
 697      */
 698
 699
 700     while (devices && *devices) {
 701         char patn[1024];
 702         char *p = devices;
 703         devices = strchr(devices, ',');
 704         if (!devices)
 705             devices = p + strlen(p);
 706         if (devices-p < 1024) {
 707                 strncpy(patn, p, devices-p);
 708                 patn[devices-p] = 0;
 709                 if (fnmatch(patn, devname, FNM_PATHNAME)==0)
 710                         return 1;
 711         }
 712         if (*devices == ',')
 713                 devices++;
 714     }
 715     return 0;
 716 }