test/test21.c

   1 /* POSIX test program (21).                     Author: Andy Tanenbaum */
   2
   3 /* The following POSIX calls are tested:
   4  *
   5  *      rename(),  mkdir(),  rmdir()
   6  */
   7
   8 #include <sys/types.h>
   9 #include <sys/stat.h>
  10 #include <errno.h>
  11 #include <fcntl.h>
  12 #include <limits.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <unistd.h>
  16 #include <stdio.h>
  17
  18 #define ITERATIONS        1
  19 #define MAX_ERROR 3
  20
  21 #include "common.c"
  22
  23 int main(int argc, char *argv []);
  24 void test21a(void);
  25 void test21b(void);
  26 void test21c(void);
  27 void test21d(void);
  28 void test21e(void);
  29 void test21f(void);
  30 void test21g(void);
  31 void test21h(void);
  32 void test21i(void);
  33 void test21k(void);
  34 void test21l(void);
  35 void test21m(void);
  36 void test21n(void);
  37 void test21o(void);
  38 int get_link(char *name);
  39
  40 int main(argc, argv)
  41 int argc;
  42 char *argv[];
  43 {
  44
  45   int i, m = 0xFFFF;
  46
  47   start(21);
  48
  49   if (argc == 2) m = atoi(argv[1]);
  50
  51   for (i = 0; i < ITERATIONS; i++) {
  52         if (m & 00001) test21a();
  53         if (m & 00002) test21b();
  54         if (m & 00004) test21c();
  55         if (m & 00010) test21d();
  56         if (m & 00020) test21e();
  57         if (m & 00040) test21f();
  58         if (m & 01000) test21g();
  59         if (m & 00200) test21h();
  60         if (m & 00400) test21i();
  61         if (m & 01000) test21k();
  62         if (m & 02000) test21l();
  63         if (m & 04000) test21m();
  64         if (m & 010000) test21n();
  65         if (m & 020000) test21o();
  66   }
  67   quit();
  68
  69   return(-1);   /* Unreachable */
  70 }
  71
  72 void test21a()
  73 {
  74 /* Test rename(). */
  75
  76   int fd, fd2;
  77   char buf[PATH_MAX+1], buf1[PATH_MAX+1], buf2[PATH_MAX+1];
  78   struct stat stat1, stat2;
  79
  80   subtest = 1;
  81
  82   unlink("A1");                 /* get rid of it if it exists */
  83   unlink("A2");                 /* get rid of it if it exists */
  84   unlink("A3");                 /* get rid of it if it exists */
  85   unlink("A4");                 /* get rid of it if it exists */
  86   unlink("A5");                 /* get rid of it if it exists */
  87   unlink("A6");                 /* get rid of it if it exists */
  88   unlink("A7");                 /* get rid of it if it exists */
  89
  90   /* Basic test.  Rename A1 to A2 and then A2 to A3. */
  91   if ( (fd=creat("A1", 0666)) < 0) e(1);
  92   if (write(fd, buf, 20) != 20) e(2);
  93   if (close(fd) < 0) e(3);
  94   if (rename("A1", "A2") < 0) e(4);
  95   if ( (fd=open("A2", O_RDONLY)) < 0) e(5);
  96   if (rename("A2", "A3") < 0) e(6);
  97   if ( (fd2=open("A3", O_RDONLY)) < 0) e(7);
  98   if (close(fd) != 0) e(8);
  99   if (close(fd2) != 0) e(9);
 100   if (unlink("A3") != 0) e(10);
 101
 102   /* Now get the absolute path name of the current directory using getcwd()
 103    * and use it to test RENAME using different combinations of relative and
 104    * absolute path names.
 105    */
 106   if (getcwd(buf, PATH_MAX) == (char *) NULL) e(11);
 107   if ( (fd = creat("A4", 0666)) < 0) e(12);
 108   if (write(fd, buf, 30) != 30) e(13);
 109   if (close(fd) != 0) e(14);
 110   strcpy(buf1, buf);
 111   strcat(buf1, "/A4");
 112   if (rename(buf1, "A5") != 0) e(15);   /* rename(absolute, relative) */
 113   if (access("A5", 6) != 0) e(16);      /* use access to see if file exists */
 114   strcpy(buf2, buf);
 115   strcat(buf2, "/A6");
 116   if (rename("A5", buf2) != 0) e(17);   /* rename(relative, absolute) */
 117   if (access("A6", 6) != 0) e(18);
 118   if (access(buf2, 6) != 0) e(19);
 119   strcpy(buf1, buf);
 120   strcat(buf1, "/A6");
 121   strcpy(buf2, buf);
 122   strcat(buf2, "/A7");
 123   if (rename(buf1, buf2) != 0) e(20);   /* rename(absolute, absolute) */
 124   if (access("A7", 6) != 0) e(21);
 125   if (access(buf2, 6) != 0) e(22);
 126
 127   /* Try renaming using names like "./A8" */
 128   if (rename("A7", "./A8") != 0) e(23);
 129   if (access("A8", 6) != 0) e(24);
 130   if (rename("./A8", "A9") != 0) e(25);
 131   if (access("A9", 6) != 0) e(26);
 132   if (rename("./A9", "./A10") != 0) e(27);
 133   if (access("A10", 6) != 0) e(28);
 134   if (access("./A10", 6) != 0) e(29);
 135   if (unlink("A10") != 0) e(30);
 136
 137   /* Now see if directories can be renamed. */
 138   if (system("rm -rf ?uzzy scsi") != 0) e(31);
 139   if (system("mkdir fuzzy") != 0) e(32);
 140   if (rename("fuzzy", "wuzzy") != 0) e(33);
 141   if ( (fd=creat("wuzzy/was_a_bear", 0666)) < 0) e(34);
 142   if (access("wuzzy/was_a_bear", 6) != 0) e(35);
 143   if (unlink("wuzzy/was_a_bear") != 0) e(36);
 144   if (close(fd) != 0) e(37);
 145   if (rename("wuzzy", "buzzy") != 0) e(38);
 146   if (system("rmdir buzzy") != 0) e(39);
 147
 148   /* Now start testing the case that 'new' exists. */
 149   if ( (fd = creat("horse", 0666)) < 0) e(40);
 150   if ( (fd2 = creat("sheep", 0666)) < 0) e(41);
 151   if (write(fd, buf, PATH_MAX) != PATH_MAX) e(42);
 152   if (write(fd2, buf, 23) != 23) e(43);
 153   if (stat("horse", &stat1) != 0) e(44);
 154   if (rename("horse", "sheep") != 0) e(45);
 155   if (stat("sheep", &stat2) != 0) e(46);
 156   if (stat1.st_dev != stat2.st_dev) e(47);
 157   if (stat1.st_ino != stat2.st_ino) e(48);
 158   if (stat2.st_size != PATH_MAX) e(49);
 159   if (access("horse", 6) == 0) e(50);
 160   if (close(fd) != 0) e(51);
 161   if (close(fd2) != 0) e(52);
 162   if (rename("sheep", "sheep") != 0) e(53);
 163   if (unlink("sheep") != 0) e(54);
 164
 165   /* Now try renaming something to a directory that already exists. */
 166   if (system("mkdir fuzzy wuzzy") != 0) e(55);
 167   if ( (fd = creat("fuzzy/was_a_bear", 0666)) < 0) e(56);
 168   if (close(fd) != 0) e(57);
 169   if (rename("fuzzy", "wuzzy") != 0) e(58);     /* 'new' is empty dir */
 170   if (system("mkdir scsi") != 0) e(59);
 171   if (rename("scsi", "wuzzy") == 0) e(60);      /* 'new' is full dir */
 172   if (errno != EEXIST && errno != ENOTEMPTY) e(61);
 173
 174   /* Test 14 character names--always tricky. */
 175   if (rename("wuzzy/was_a_bear", "wuzzy/was_not_a_bear") != 0) e(62);
 176   if (access("wuzzy/was_not_a_bear", 6) != 0) e(63);
 177   if (rename("wuzzy/was_not_a_bear", "wuzzy/was_not_a_duck") != 0) e(64);
 178   if (access("wuzzy/was_not_a_duck", 6) != 0) e(65);
 179   if (rename("wuzzy/was_not_a_duck", "wuzzy/was_a_bird") != 0) e(65);
 180   if (access("wuzzy/was_a_bird", 6) != 0) e(66);
 181
 182   /* Test moves between directories. */
 183   if (rename("wuzzy/was_a_bird", "beast") != 0) e(67);
 184   if (access("beast", 6) != 0) e(68);
 185   if (rename("beast", "wuzzy/was_a_cat") != 0) e(69);
 186   if (access("wuzzy/was_a_cat", 6) != 0) e(70);
 187
 188   /* Test error conditions. 'scsi' and 'wuzzy/was_a_cat' exist now. */
 189   if (rename("wuzzy/was_a_cat", "wuzzy/was_a_dog") != 0) e(71);
 190   if (access("wuzzy/was_a_dog", 6) != 0) e(72);
 191   if (chmod("wuzzy", 0) != 0) e(73);
 192
 193   errno = 0;
 194   if (rename("wuzzy/was_a_dog", "wuzzy/was_a_pig") != -1) e(74);
 195   if (errno != EACCES) e(75);
 196
 197   errno = 0;
 198   if (rename("wuzzy/was_a_dog", "doggie") != -1) e(76);
 199   if (errno != EACCES) e(77);
 200
 201   errno = 0;
 202   if ( (fd = creat("beast", 0666)) < 0) e(78);
 203   if (close(fd) != 0) e(79);
 204   if (rename("beast", "wuzzy/was_a_twit") != -1) e(80);
 205   if (errno != EACCES) e(81);
 206
 207   errno = 0;
 208   if (rename("beast", "wuzzy") != -1) e(82);
 209   if (errno != EISDIR) e(83);
 210
 211   errno = 0;
 212   if (rename("beest", "baste") != -1) e(84);
 213   if (errno != ENOENT) e(85);
 214
 215   errno = 0;
 216   if (rename("wuzzy", "beast") != -1) e(86);
 217   if (errno != ENOTDIR) e(87);
 218
 219   /* Test prefix rule. */
 220   errno = 0;
 221   if (chmod("wuzzy", 0777) != 0) e(88);
 222   if (unlink("wuzzy/was_a_dog") != 0) e(89);
 223   strcpy(buf1, buf);
 224   strcat(buf1, "/wuzzy");
 225   if (rename(buf, buf1) != -1) e(90);
 226   if (errno != EINVAL) e(91);
 227
 228   if (system("rm -rf wuzzy beast scsi") != 0) e(92);
 229 }
 230
 231
 232
 233 void test21b()
 234 {
 235 /* Test mkdir() and rmdir(). */
 236
 237   int i;
 238   char name[3];
 239   struct stat statbuf;
 240
 241   subtest = 2;
 242
 243   /* Simple stuff. */
 244   if (mkdir("D1", 0700) != 0) e(1);
 245   if (stat("D1", &statbuf) != 0) e(2);
 246   if (!S_ISDIR(statbuf.st_mode)) e(3);
 247   if ( (statbuf.st_mode & 0777) != 0700) e(4);
 248   if (rmdir("D1") != 0) e(5);
 249
 250   /* Make and remove 40 directories.  By doing so, the directory has to
 251    * grow to 2 blocks.  That presents plenty of opportunity for bugs.
 252    */
 253   name[0] = 'D';
 254   name[2] = '\0';
 255   for (i = 0; i < 40; i++) {
 256         name[1] = 'A' + i;
 257         if (mkdir(name, 0700 + i%7) != 0) e(10+i);      /* for simplicity */
 258   }
 259   for (i = 0; i < 40; i++) {
 260         name[1] = 'A' + i;
 261         if (rmdir(name) != 0) e(50+i);
 262   }
 263 }
 264
 265 void test21c()
 266 {
 267 /* Test mkdir() and rmdir(). */
 268
 269   subtest = 3;
 270
 271   if (mkdir("D1", 0777) != 0) e(1);
 272   if (mkdir("D1/D2", 0777) != 0) e(2);
 273   if (mkdir("D1/D2/D3", 0777) != 0) e(3);
 274   if (mkdir("D1/D2/D3/D4", 0777) != 0) e(4);
 275   if (mkdir("D1/D2/D3/D4/D5", 0777) != 0) e(5);
 276   if (mkdir("D1/D2/D3/D4/D5/D6", 0777) != 0) e(6);
 277   if (mkdir("D1/D2/D3/D4/D5/D6/D7", 0777) != 0) e(7);
 278   if (mkdir("D1/D2/D3/D4/D5/D6/D7/D8", 0777) != 0) e(8);
 279   if (mkdir("D1/D2/D3/D4/D5/D6/D7/D8/D9", 0777) != 0) e(9);
 280   if (access("D1/D2/D3/D4/D5/D6/D7/D8/D9", 7) != 0) e(10);
 281   if (rmdir("D1/D2/D3/D4/D5/D6/D7/D8/D9") != 0) e(11);
 282   if (rmdir("D1/D2/D3/D4/D5/D6/D7/D8") != 0) e(12);
 283   if (rmdir("D1/D2/D3/D4/D5/D6/D7") != 0) e(13);
 284   if (rmdir("D1/D2/D3/D4/D5/D6") != 0) e(11);
 285   if (rmdir("D1/D2/D3/D4/D5") != 0) e(13);
 286   if (rmdir("D1/D2/D3/D4") != 0) e(14);
 287   if (rmdir("D1/D2/D3") != 0) e(15);
 288   if (rmdir("D1/D2") != 0) e(16);
 289   if (rmdir("D1") != 0) e(17);
 290 }
 291
 292 void test21d()
 293 {
 294 /* Test making directories with files and directories in them. */
 295
 296   int fd1, fd2, fd3, fd4, fd5, fd6, fd7, fd8, fd9;
 297
 298   subtest = 4;
 299
 300   if (mkdir("D1", 0777) != 0) e(1);
 301   if (mkdir("D1/D2", 0777) != 0) e(2);
 302   if (mkdir("./D1/D3", 0777) != 0) e(3);
 303   if (mkdir("././D1/D4", 0777) != 0) e(4);
 304   if ( (fd1 = creat("D1/D2/x", 0700)) < 0) e(5);
 305   if ( (fd2 = creat("D1/D2/y", 0700)) < 0) e(6);
 306   if ( (fd3 = creat("D1/D2/z", 0700)) < 0) e(7);
 307   if ( (fd4 = creat("D1/D3/x", 0700)) < 0) e(8);
 308   if ( (fd5 = creat("D1/D3/y", 0700)) < 0) e(9);
 309   if ( (fd6 = creat("D1/D3/z", 0700)) < 0) e(10);
 310   if ( (fd7 = creat("D1/D4/x", 0700)) < 0) e(11);
 311   if ( (fd8 = creat("D1/D4/y", 0700)) < 0) e(12);
 312   if ( (fd9 = creat("D1/D4/z", 0700)) < 0) e(13);
 313   if (unlink("D1/D2/z") != 0) e(14);
 314   if (unlink("D1/D2/y") != 0) e(15);
 315   if (unlink("D1/D2/x") != 0) e(16);
 316   if (unlink("D1/D3/x") != 0) e(17);
 317   if (unlink("D1/D3/z") != 0) e(18);
 318   if (unlink("D1/D3/y") != 0) e(19);
 319   if (unlink("D1/D4/y") != 0) e(20);
 320   if (unlink("D1/D4/z") != 0) e(21);
 321   if (unlink("D1/D4/x") != 0) e(22);
 322   if (rmdir("D1/D2") != 0) e(23);
 323   if (rmdir("D1/D3") != 0) e(24);
 324   if (rmdir("D1/D4") != 0) e(25);
 325   if (rmdir("D1") != 0) e(26);
 326   if (close(fd1) != 0) e(27);
 327   if (close(fd2) != 0) e(28);
 328   if (close(fd3) != 0) e(29);
 329   if (close(fd4) != 0) e(30);
 330   if (close(fd5) != 0) e(31);
 331   if (close(fd6) != 0) e(32);
 332   if (close(fd7) != 0) e(33);
 333   if (close(fd8) != 0) e(34);
 334   if (close(fd9) != 0) e(35);
 335
 336 }
 337
 338 void test21e()
 339 {
 340 /* Test error conditions. */
 341
 342   subtest = 5;
 343
 344   if (mkdir("D1", 0677) != 0) e(1);
 345   errno = 0;
 346   if (mkdir("D1/D2", 0777) != -1) e(2);
 347   if (errno != EACCES) e(3);
 348   if (chmod ("D1", 0577) != 0) e(4);
 349   errno = 0;
 350   if (mkdir("D1/D2", 0777) != -1) e(5);
 351   if (errno != EACCES) e(6);
 352   if (chmod ("D1", 0777) != 0) e(7);
 353   errno = 0;
 354   if (mkdir("D1", 0777) != -1) e(8);
 355   if (errno != EEXIST) e(9);
 356   errno = 0;
 357   if (mkdir("D1/D2/x", 0777) != -1) e(14);
 358   if (errno != ENOENT) e(15);
 359
 360   /* A particularly nasty test is when the parent has mode 0.  Although
 361    * this is unlikely to work, it had better not muck up the file system
 362    */
 363   if (mkdir("D1/D2", 0777) != 0) e(16);
 364   if (chmod("D1", 0) != 0) e(17);
 365   errno = 0;
 366   if (rmdir("D1/D2") != -1) e(18);
 367   if (errno != EACCES) e(19);
 368   if (chmod("D1", 0777) != 0) e(20);
 369   if (rmdir("D1/D2") != 0) e(21);
 370   if (rmdir("D1") != 0) e(22);
 371 }
 372
 373 void test21f()
 374 {
 375 /* The rename() function affects the link count of all the files and
 376  * directories it goes near.  Test to make sure it gets everything ok.
 377  * There are four cases:
 378  *
 379  *   1. rename("d1/file1", "d1/file2"); - rename file without moving it
 380  *   2. rename("d1/file1", "d2/file2"); - move a file to another dir
 381  *   3. rename("d1/dir1", "d2/dir2");   - rename a dir without moving it
 382  *   4. rename("d1/dir1", "d2/dir2");   - move a dir to another dir
 383  *
 384  * Furthermore, a distinction has to be made when the target file exists
 385  * and when it does not exist, giving 8 cases in all.
 386  */
 387
 388   int fd, D1_before, D1_after, x_link, y_link;
 389
 390   /* Test case 1: renaming a file within the same directory. */
 391   subtest = 6;
 392   if (mkdir("D1", 0777) != 0) e(1);
 393   if ( (fd = creat("D1/x", 0777)) < 0) e(2);
 394   if (close(fd) != 0) e(3);
 395   D1_before = get_link("D1");
 396   x_link = get_link("D1/x");
 397   if (rename("D1/x", "D1/y") != 0) e(4);
 398   y_link = get_link("D1/y");
 399   D1_after = get_link("D1");
 400   if (D1_before != 2) e(5);
 401   if (D1_after != 2) e(6);
 402   if (x_link != 1) e(7);
 403   if (y_link != 1) e(8);
 404   if (access("D1/y", 7) != 0) e(9);
 405   if (unlink("D1/y") != 0) e(10);
 406   if (rmdir("D1") != 0) e(11);
 407 }
 408
 409 void test21g()
 410 {
 411   int fd, D1_before, D1_after, D2_before, D2_after, x_link, y_link;
 412
 413   /* Test case 2: move a file to a new directory. */
 414   subtest = 7;
 415   if (mkdir("D1", 0777) != 0) e(1);
 416   if (mkdir("D2", 0777) != 0) e(2);
 417   if ( (fd = creat("D1/x", 0777)) < 0) e(3);
 418   if (close(fd) != 0) e(4);
 419   D1_before = get_link("D1");
 420   D2_before = get_link("D2");
 421   x_link = get_link("D1/x");
 422   if (rename("D1/x", "D2/y") != 0) e(5);
 423   y_link = get_link("D2/y");
 424   D1_after = get_link("D1");
 425   D2_after = get_link("D2");
 426   if (D1_before != 2) e(6);
 427   if (D2_before != 2) e(7);
 428   if (D1_after != 2) e(8);
 429   if (D2_after != 2) e(9);
 430   if (x_link != 1) e(10);
 431   if (y_link != 1) e(11);
 432   if (access("D2/y", 7) != 0) e(12);
 433   if (unlink("D2/y") != 0) e(13);
 434   if (rmdir("D1") != 0) e(14);
 435   if (rmdir("D2") != 0) e(15);
 436 }
 437
 438 void test21h()
 439 {
 440   int D1_before, D1_after, x_link, y_link;
 441
 442   /* Test case 3: renaming a directory within the same directory. */
 443   subtest = 8;
 444   if (mkdir("D1", 0777) != 0) e(1);
 445   if (mkdir("D1/X", 0777) != 0) e(2);
 446   D1_before = get_link("D1");
 447   x_link = get_link("D1/X");
 448   if (rename("D1/X", "D1/Y") != 0) e(3);
 449   y_link = get_link("D1/Y");
 450   D1_after = get_link("D1");
 451   if (D1_before != 3) e(4);
 452   if (D1_after != 3) e(5);
 453   if (x_link != 2) e(6);
 454   if (y_link != 2) e(7);
 455   if (access("D1/Y", 7) != 0) e(8);
 456   if (rmdir("D1/Y") != 0) e(9);
 457   if (get_link("D1") != 2) e(10);
 458   if (rmdir("D1") != 0) e(11);
 459 }
 460
 461 void test21i()
 462 {
 463   int D1_before, D1_after, D2_before, D2_after, x_link, y_link;
 464
 465   /* Test case 4: move a directory to a new directory. */
 466   subtest = 9;
 467   if (mkdir("D1", 0777) != 0) e(1);
 468   if (mkdir("D2", 0777) != 0) e(2);
 469   if (mkdir("D1/X", 0777) != 0) e(3);
 470   D1_before = get_link("D1");
 471   D2_before = get_link("D2");
 472   x_link = get_link("D1/X");
 473   if (rename("D1/X", "D2/Y") != 0) e(4);
 474   y_link = get_link("D2/Y");
 475   D1_after = get_link("D1");
 476   D2_after = get_link("D2");
 477   if (D1_before != 3) e(5);
 478   if (D2_before != 2) e(6);
 479   if (D1_after != 2) e(7);
 480   if (D2_after != 3) e(8);
 481   if (x_link != 2) e(9);
 482   if (y_link != 2) e(10);
 483   if (access("D2/Y", 7) != 0) e(11);
 484   if (rename("D2/Y", "D1/Z") != 0) e(12);
 485   if (get_link("D1") != 3) e(13);
 486   if (get_link("D2") != 2) e(14);
 487   if (rmdir("D1/Z") != 0) e(15);
 488   if (get_link("D1") != 2) e(16);
 489   if (rmdir("D1") != 0) e(17);
 490   if (rmdir("D2") != 0) e(18);
 491 }
 492
 493 void test21k()
 494 {
 495 /* Now test the same 4 cases, except when the target exists. */
 496
 497   int fd, D1_before, D1_after, x_link, y_link;
 498
 499   /* Test case 5: renaming a file within the same directory. */
 500   subtest = 10;
 501   if (mkdir("D1", 0777) != 0) e(1);
 502   if ( (fd = creat("D1/x", 0777)) < 0) e(2);
 503   if (close(fd) != 0) e(3);
 504   if ( (fd = creat("D1/y", 0777)) < 0) e(3);
 505   if (close(fd) != 0) e(4);
 506   D1_before = get_link("D1");
 507   x_link = get_link("D1/x");
 508   if (rename("D1/x", "D1/y") != 0) e(5);
 509   y_link = get_link("D1/y");
 510   D1_after = get_link("D1");
 511   if (D1_before != 2) e(6);
 512   if (D1_after != 2) e(7);
 513   if (x_link != 1) e(8);
 514   if (y_link != 1) e(9);
 515   if (access("D1/y", 7) != 0) e(10);
 516   if (unlink("D1/y") != 0) e(11);
 517   if (rmdir("D1") != 0) e(12);
 518 }
 519
 520 void test21l()
 521 {
 522   int fd, D1_before, D1_after, D2_before, D2_after, x_link, y_link;
 523
 524   /* Test case 6: move a file to a new directory. */
 525   subtest = 11;
 526   if (mkdir("D1", 0777) != 0) e(1);
 527   if (mkdir("D2", 0777) != 0) e(2);
 528   if ( (fd = creat("D1/x", 0777)) < 0) e(3);
 529   if (close(fd) != 0) e(4);
 530   if ( (fd = creat("D2/y", 0777)) < 0) e(5);
 531   if (close(fd) != 0) e(6);
 532   D1_before = get_link("D1");
 533   D2_before = get_link("D2");
 534   x_link = get_link("D1/x");
 535   if (rename("D1/x", "D2/y") != 0) e(7);
 536   y_link = get_link("D2/y");
 537   D1_after = get_link("D1");
 538   D2_after = get_link("D2");
 539   if (D1_before != 2) e(8);
 540   if (D2_before != 2) e(9);
 541   if (D1_after != 2) e(10);
 542   if (D2_after != 2) e(11);
 543   if (x_link != 1) e(12);
 544   if (y_link != 1) e(13);
 545   if (access("D2/y", 7) != 0) e(14);
 546   if (unlink("D2/y") != 0) e(15);
 547   if (rmdir("D1") != 0) e(16);
 548   if (rmdir("D2") != 0) e(17);
 549 }
 550
 551 void test21m()
 552 {
 553   int D1_before, D1_after, x_link, y_link;
 554
 555   /* Test case 7: renaming a directory within the same directory. */
 556   subtest = 12;
 557   if (mkdir("D1", 0777) != 0) e(1);
 558   if (mkdir("D1/X", 0777) != 0) e(2);
 559   if (mkdir("D1/Y", 0777) != 0) e(3);
 560   D1_before = get_link("D1");
 561   x_link = get_link("D1/X");
 562   if (rename("D1/X", "D1/Y") != 0) e(4);
 563   y_link = get_link("D1/Y");
 564   D1_after = get_link("D1");
 565   if (D1_before != 4) e(5);
 566   if (D1_after != 3) e(6);
 567   if (x_link != 2) e(7);
 568   if (y_link != 2) e(8);
 569   if (access("D1/Y", 7) != 0) e(9);
 570   if (rmdir("D1/Y") != 0) e(10);
 571   if (get_link("D1") != 2) e(11);
 572   if (rmdir("D1") != 0) e(12);
 573 }
 574
 575 void test21n()
 576 {
 577   int D1_before, D1_after, D2_before, D2_after, x_link, y_link;
 578
 579   /* Test case 8: move a directory to a new directory. */
 580   subtest = 13;
 581   if (mkdir("D1", 0777) != 0) e(1);
 582   if (mkdir("D2", 0777) != 0) e(2);
 583   if (mkdir("D1/X", 0777) != 0) e(3);
 584   if (mkdir("D2/Y", 0777) != 0) e(4);
 585   D1_before = get_link("D1");
 586   D2_before = get_link("D2");
 587   x_link = get_link("D1/X");
 588   if (rename("D1/X", "D2/Y") != 0) e(5);
 589   y_link = get_link("D2/Y");
 590   D1_after = get_link("D1");
 591   D2_after = get_link("D2");
 592   if (D1_before != 3) e(6);
 593   if (D2_before != 3) e(7);
 594   if (D1_after != 2) e(8);
 595   if (D2_after != 3) e(9);
 596   if (x_link != 2) e(10);
 597   if (y_link != 2) e(11);
 598   if (access("D2/Y", 7) != 0) e(12);
 599   if (rename("D2/Y", "D1/Z") != 0) e(13);
 600   if (get_link("D1") != 3) e(14);
 601   if (get_link("D2") != 2) e(15);
 602   if (rmdir("D1/Z") != 0) e(16);
 603   if (get_link("D1") != 2) e(17);
 604   if (rmdir("D1") != 0) e(18);
 605   if (rmdir("D2") != 0) e(19);
 606 }
 607
 608 void test21o()
 609 {
 610   /* Test trying to remove . and .. */
 611   subtest = 14;
 612   if (mkdir("D1", 0777) != 0) e(1);
 613   if (chdir("D1") != 0) e(2);
 614   if (rmdir(".") == 0) e(3);
 615   if (rmdir("..") == 0) e(4);
 616   if (mkdir("D2", 0777) != 0) e(5);
 617   if (mkdir("D3", 0777) != 0) e(6);
 618   if (mkdir("D4", 0777) != 0) e(7);
 619   if (rmdir("D2/../D3/../D4") != 0) e(8);       /* legal way to remove D4 */
 620   if (rmdir("D2/../D3/../D2/..") == 0) e(9);    /* removing self is illegal */
 621   if (rmdir("D2/../D3/../D2/../..") == 0) e(10);/* removing parent is illegal*/
 622   if (rmdir("../D1/../D1/D3") != 0) e(11);      /* legal way to remove D3 */
 623   if (rmdir("./D2/../D2") != 0) e(12);          /* legal way to remove D2 */
 624   if (chdir("..") != 0) e(13);
 625   if (rmdir("D1") != 0) e(14);
 626 }
 627
 628 int get_link(name)
 629 char *name;
 630 {
 631   struct stat statbuf;
 632
 633   if (stat(name, &statbuf) != 0) {
 634         printf("Unable to stat %s\n", name);
 635         errct++;
 636         return(-1);
 637   }
 638   return(statbuf.st_nlink);
 639 }
 640