test/test7.c

   1 /* POSIX test program (7).                      Author: Andy Tanenbaum */
   2
   3 /* The following POSIX calls are tested:
   4  *      pipe(), mkfifo(), fcntl()
   5  */
   6
   7 #include <sys/types.h>
   8 #include <sys/stat.h>
   9 #include <sys/wait.h>
  10 #include <errno.h>
  11 #include <fcntl.h>
  12 #include <limits.h>
  13 #include <signal.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <unistd.h>
  17 #include <stdio.h>
  18 #include <setjmp.h>
  19
  20 #define ITERATIONS        4
  21 #define MAX_ERROR 4
  22 #define ITEMS  32
  23 #define READ   10
  24 #define WRITE  20
  25 #define UNLOCK 30
  26 #define U      70
  27 #define L      80
  28
  29 char buf[ITEMS] = {0,1,2,3,4,5,6,7,8,9,8,7,6,5,4,3,2,1,0,1,2,3,4,5,6,7,8,9};
  30
  31 int subtest, errct, xfd;
  32 int whence = SEEK_SET, func_code = F_SETLK;
  33 extern char **environ;
  34
  35 #define timed_test(func) (timed_test_func(#func, func));
  36
  37 _PROTOTYPE(int main, (int argc, char *argv []));
  38 _PROTOTYPE(void timed_test_func, (const char *s, void (* func)(void)));
  39 _PROTOTYPE(void timed_test_timeout, (int signum));
  40 _PROTOTYPE(void test7a, (void));
  41 _PROTOTYPE(void test7b, (void));
  42 _PROTOTYPE(void test7c, (void));
  43 _PROTOTYPE(void test7d, (void));
  44 _PROTOTYPE(void test7e, (void));
  45 _PROTOTYPE(void test7f, (void));
  46 _PROTOTYPE(void test7g, (void));
  47 _PROTOTYPE(void test7h, (void));
  48 _PROTOTYPE(void test7i, (void));
  49 _PROTOTYPE(void test7j, (void));
  50 _PROTOTYPE(void cloexec_test, (void));
  51 _PROTOTYPE(int set, (int how, int first, int last));
  52 _PROTOTYPE(int locked, (int b));
  53 _PROTOTYPE(void e, (int n));
  54 _PROTOTYPE(void sigfunc, (int s));
  55 _PROTOTYPE(void quit, (void));
  56
  57 int main(argc, argv)
  58 int argc;
  59 char *argv[];
  60 {
  61
  62   int i, m = 0xFFFF;
  63
  64   sync();
  65
  66   if (argc == 2) m = atoi(argv[1]);
  67   if (m == 0) cloexec_test();   /* important; do not remove this! */
  68   printf("Test  7 ");
  69   fflush(stdout);
  70
  71   system("rm -rf DIR_07; mkdir DIR_07");
  72   chdir("DIR_07");
  73
  74   for (i = 0; i < ITERATIONS; i++) {
  75         if (m & 00001) timed_test(test7a);
  76         if (m & 00002) timed_test(test7b);
  77         if (m & 00004) timed_test(test7c);
  78         if (m & 00010) timed_test(test7d);
  79         if (m & 00020) timed_test(test7e);
  80         if (m & 00040) timed_test(test7f);
  81         if (m & 00100) timed_test(test7g);
  82         if (m & 00200) timed_test(test7h);
  83         if (m & 00400) timed_test(test7i);
  84         if (m & 01000) timed_test(test7j);
  85   }
  86   quit();
  87   return(-1);                   /* impossible */
  88 }
  89
  90 static jmp_buf timed_test_context;
  91
  92 void timed_test_timeout(int signum)
  93 {
  94   longjmp(timed_test_context, -1);
  95   e(700);
  96   quit();
  97   exit(-1);
  98 }
  99
 100 void timed_test_func(const char *s, void (* func)(void))
 101 {
 102   if (setjmp(timed_test_context) == 0)
 103   {
 104     /* the function gets 60 seconds to complete */
 105     if (signal(SIGALRM, timed_test_timeout) == SIG_ERR) { e(701); return; }
 106     alarm(60);
 107     func();
 108     alarm(0);
 109   }
 110   else
 111   {
 112     /* report timeout as error */
 113     printf("timeout in %s\n", s);
 114     e(702);
 115   }
 116 }
 117
 118 void test7a()
 119 {
 120 /* Test pipe(). */
 121
 122   int i, fd[2], ect;
 123   char buf2[ITEMS+1];
 124
 125   /* Create a pipe, write on it, and read it back. */
 126   subtest = 1;
 127   if (pipe(fd) != 0) e(1);
 128   if (write(fd[1], buf, ITEMS) != ITEMS) e(2);
 129   buf2[0] = 0;
 130   if (read(fd[0], buf2, ITEMS+1) != ITEMS) e(3);
 131   ect = 0;
 132   for (i = 0; i < ITEMS; i++) if (buf[i] != buf2[i]) ect++;
 133   if (ect != 0) e(4);
 134   if (close(fd[0]) != 0) e(5);
 135   if (close(fd[1]) != 0) e(6);
 136
 137   /* Error test.  Keep opening pipes until it fails.  Check error code. */
 138   errno = 0;
 139   while (1) {
 140         if (pipe(fd) < 0) break;
 141   }
 142   if (errno != EMFILE) e(7);
 143
 144   /* Close all the pipes. */
 145   for (i = 3; i < OPEN_MAX; i++) close(i);
 146 }
 147
 148 void test7b()
 149 {
 150 /* Test mkfifo(). */
 151
 152   int fdr, fdw, status;
 153   char buf2[ITEMS+1];
 154   int efork;
 155
 156   /* Create a fifo, write on it, and read it back. */
 157   subtest = 2;
 158   if (mkfifo("T7.b", 0777) != 0) e(1);
 159   switch (fork()) {
 160   case -1:
 161         efork = errno;
 162         printf("Fork failed: %s (%d)\n", strerror(efork), efork);
 163         exit(1);
 164   case 0:
 165         /* Child reads from the fifo. */
 166         if ( (fdr = open("T7.b", O_RDONLY)) < 0) e(5);
 167         if (read(fdr, buf2, ITEMS+1) != ITEMS) e(6);
 168         if (strcmp(buf, buf2) != 0) e(7);
 169         if (close(fdr) != 0) e(8);
 170         exit(0);
 171   default:
 172         /* Parent writes on the fifo. */
 173         if ( (fdw = open("T7.b", O_WRONLY)) < 0) e(2);
 174         if (write(fdw, buf, ITEMS) != ITEMS) e(3);
 175         wait(&status);
 176         if (close(fdw) != 0) e(4);
 177   }
 178
 179   /* Check some error conditions. */
 180   if (mkfifo("T7.b", 0777) != -1) e(9);
 181   errno = 0;
 182   if (mkfifo("a/b/c", 0777) != -1) e(10);
 183   if (errno != ENOENT) e(11);
 184   errno = 0;
 185   if (mkfifo("", 0777) != -1) e(12);
 186   if (errno != ENOENT) e(13);
 187   errno = 0;
 188   if (mkfifo("T7.b/x", 0777) != -1) e(14);
 189   if (errno != ENOTDIR) e(15);
 190   if (unlink("T7.b") != 0) e(16);
 191
 192   /* Now check fifos and the O_NONBLOCK flag. */
 193   if (mkfifo("T7.b", 0600) != 0) e(17);
 194   errno = 0;
 195   if (open("T7.b", O_WRONLY | O_NONBLOCK) != -1) e(18);
 196   if (errno != ENXIO) e(19);
 197   if ( (fdr = open("T7.b", O_RDONLY | O_NONBLOCK)) < 0) e(20);
 198   if (fork()) {
 199         /* Parent reads from fdr. */
 200         wait(&status);          /* but first make sure writer has already run*/
 201         if ( ( (status>>8) & 0377) != 77) e(21);
 202         if (read(fdr, buf2, ITEMS+1) != ITEMS) e(22);
 203         if (strcmp(buf, buf2) != 0) e(23);
 204         if (close(fdr) != 0) e(24);
 205   } else {
 206         /* Child opens the fifo for writing and writes to it. */
 207         if ( (fdw = open("T7.b", O_WRONLY | O_NONBLOCK)) < 0) e(25);
 208         if (write(fdw, buf, ITEMS) != ITEMS) e(26);
 209         if (close(fdw) != 0) e(27);
 210         exit(77);
 211   }
 212
 213   if (unlink("T7.b") != 0) e(28);
 214 }
 215
 216 void test7c()
 217 {
 218 /* Test fcntl(). */
 219
 220   int fd, m, s, newfd, newfd2;
 221   struct stat stat1, stat2, stat3;
 222
 223   subtest = 3;
 224   errno = -100;
 225   if ( (fd = creat("T7.c", 0777)) < 0) e(1);
 226
 227   /* Turn the per-file-descriptor flags on and off. */
 228   if (fcntl(fd, F_GETFD) != 0) e(2);    /* FD_CLOEXEC is initially off */
 229   if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0) e(3);/* turn it on */
 230   if (fcntl(fd, F_GETFD) != FD_CLOEXEC) e(4);   /* should be on now */
 231   if (fcntl(fd, F_SETFD, 0) != 0) e(5);         /* turn it off */
 232   if (fcntl(fd, F_GETFD) != 0) e(6);            /* should be off now */
 233
 234   /* Turn the open-file-description flags on and off. Start with O_APPEND. */
 235   m = O_WRONLY;
 236   if (fcntl(fd, F_GETFL) != m) e(7);    /* O_APPEND, O_NONBLOCK are off */
 237   if (fcntl(fd, F_SETFL, O_APPEND) != 0) e(8);   /* turn on O_APPEND */
 238   if (fcntl(fd, F_GETFL) != (O_APPEND | m)) e(9);/* should be on now */
 239   if (fcntl(fd, F_SETFL, 0) != 0) e(10);         /* turn it off */
 240   if (fcntl(fd, F_GETFL) != m) e(11);            /* should be off now */
 241
 242   /* Turn the open-file-description flags on and off. Now try O_NONBLOCK.  */
 243   if (fcntl(fd, F_SETFL, O_NONBLOCK) != 0) e(12);      /* turn on O_NONBLOCK */
 244   if (fcntl(fd, F_GETFL) != (O_NONBLOCK | m)) e(13);   /* should be on now */
 245   if (fcntl(fd, F_SETFL, 0) != 0) e(14);               /* turn it off */
 246   if (fcntl(fd, F_GETFL) != m) e(15);                  /* should be off now */
 247
 248   /* Now both at once. */
 249   if (fcntl(fd, F_SETFL, O_APPEND|O_NONBLOCK) != 0) e(16);
 250   if (fcntl(fd, F_GETFL) != (O_NONBLOCK | O_APPEND | m)) e(17);
 251   if (fcntl(fd, F_SETFL, 0) != 0) e(18);
 252   if (fcntl(fd, F_GETFL) != m) e(19);
 253
 254   /* Now test F_DUPFD. */
 255   if ( (newfd = fcntl(fd, F_DUPFD, 0)) != 4) e(20);     /* 0-4 open */
 256   if ( (newfd2 = fcntl(fd, F_DUPFD, 0)) != 5) e(21);    /* 0-5 open */
 257   if (close(newfd) != 0) e(22);                         /* 0-3, 5 open */
 258   if ( (newfd = fcntl(fd, F_DUPFD, 0)) != 4) e(23);     /* 0-5 open */
 259   if (close(newfd) != 0) e(24);                         /* 0-3, 5 open */
 260   if ( (newfd = fcntl(fd, F_DUPFD, 5)) != 6) e(25);     /* 0-3, 5, 6 open */
 261   if (close(newfd2) != 0) e(26);                        /* 0-3, 6 open */
 262
 263   /* O_APPEND should be inherited, but FD_CLOEXEC should be cleared.  Check. */
 264   if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0) e(26);/* turn FD_CLOEXEC on */
 265   if (fcntl(fd, F_SETFL, O_APPEND) != 0) e(27);  /* turn O_APPEND on */
 266   if ( (newfd2 = fcntl(fd, F_DUPFD, 10)) != 10) e(28);  /* 0-3, 6, 10 open */
 267   if (fcntl(newfd2, F_GETFD) != 0) e(29);       /* FD_CLOEXEC must be 0 */
 268   if (fcntl(newfd2, F_GETFL) != (O_APPEND | m)) e(30);  /* O_APPEND set */
 269   if (fcntl(fd, F_SETFD, 0) != 0) e(31);/* turn FD_CLOEXEC off */
 270
 271   /* Check if newfd and newfd2 are the same inode. */
 272   if (fstat(fd, &stat1) != 0) e(32);
 273   if (fstat(fd, &stat2) != 0) e(33);
 274   if (fstat(fd, &stat3) != 0) e(34);
 275   if (stat1.st_dev != stat2.st_dev) e(35);
 276   if (stat1.st_dev != stat3.st_dev) e(36);
 277   if (stat1.st_ino != stat2.st_ino) e(37);
 278   if (stat1.st_ino != stat3.st_ino) e(38);
 279
 280   /* Now check on the FD_CLOEXEC flag.  Set it for fd (3) and newfd2 (10) */
 281   if (fd != 3 || newfd2 != 10 || newfd != 6) e(39);
 282   if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0) e(40);       /* close 3 on exec */
 283   if (fcntl(newfd2, F_SETFD, FD_CLOEXEC) != 0) e(41);   /* close 10 on exec */
 284   if (fcntl(newfd, F_SETFD, 0) != 0) e(42);             /* don't close 6 */
 285   if (fork()) {
 286         wait(&s);               /* parent just waits */
 287         if (WEXITSTATUS(s) != 0) e(43);
 288   } else {
 289         execle("../test7", "test7", "0", (char *) 0, environ);
 290         exit(1);                /* the impossible never happens, right? */
 291   }
 292
 293   /* Finally, close all the files. */
 294   if (fcntl(fd, F_SETFD, 0) != 0) e(44);        /* FD_CLOEXEC off */
 295   if (fcntl(newfd2, F_SETFD, 0) != 0) e(45);    /* FD_CLOEXEC off */
 296   if (close(fd) != 0) e(46);
 297   if (close(newfd) != 0) e(47);
 298   if (close(newfd2) != 0) e(48);
 299 }
 300
 301 void test7d()
 302 {
 303 /* Test file locking. */
 304
 305   subtest = 4;
 306
 307   if ( (xfd = creat("T7.d", 0777)) != 3) e(1);
 308   close(xfd);
 309   if ( (xfd = open("T7.d", O_RDWR)) < 0) e(2);
 310   if (write(xfd, buf, ITEMS) != ITEMS) e(3);
 311   if (set(WRITE, 0, 3) != 0) e(4);
 312   if (set(WRITE, 5, 9) != 0) e(5);
 313   if (set(UNLOCK, 0, 3) != 0) e(6);
 314   if (set(UNLOCK, 4, 9) != 0) e(7);
 315
 316   if (set(READ, 1, 4) != 0) e(8);
 317   if (set(READ, 4, 7) != 0) e(9);
 318   if (set(UNLOCK, 4, 7) != 0) e(10);
 319   if (set(UNLOCK, 1, 4) != 0) e(11);
 320
 321   if (set(WRITE, 0, 3) != 0) e(12);
 322   if (set(WRITE, 5, 7) != 0) e(13);
 323   if (set(WRITE, 9 ,10) != 0) e(14);
 324   if (set(UNLOCK, 0, 4) != 0) e(15);
 325   if (set(UNLOCK, 0, 7) != 0) e(16);
 326   if (set(UNLOCK, 0, 2000) != 0) e(17);
 327
 328   if (set(WRITE, 0, 3) != 0) e(18);
 329   if (set(WRITE, 5, 7) != 0) e(19);
 330   if (set(WRITE, 9 ,10) != 0) e(20);
 331   if (set(UNLOCK, 0, 100) != 0) e(21);
 332
 333   if (set(WRITE, 0, 9) != 0) e(22);
 334   if (set(UNLOCK, 8, 9) != 0) e(23);
 335   if (set(UNLOCK, 0, 2) != 0) e(24);
 336   if (set(UNLOCK, 5, 5) != 0) e(25);
 337   if (set(UNLOCK, 4, 6) != 0) e(26);
 338   if (set(UNLOCK, 3, 3) != 0) e(27);
 339   if (set(UNLOCK, 7, 7) != 0) e(28);
 340
 341   if (set(WRITE, 0, 10) != 0) e(29);
 342   if (set(UNLOCK, 0, 1000) != 0) e(30);
 343
 344   /* Up until now, all locks have been disjoint.  Now try conflicts. */
 345   if (set(WRITE, 0, 4) != 0) e(31);
 346   if (set(WRITE, 4, 7) != 0) e(32);     /* owner may lock same byte twice */
 347   if (set(WRITE, 5, 10) != 0) e(33);
 348   if (set(UNLOCK, 0, 11) != 0) e(34);
 349
 350   /* File is now unlocked. Length 0 means whole file. */
 351   if (set(WRITE, 2, 1) != 0) e(35);     /* this locks whole file */
 352   if (set(WRITE, 9,10) != 0) e(36);     /* a process can relock its file */
 353   if (set(WRITE, 3, 3) != 0) e(37);
 354   if (set(UNLOCK, 0, -1) != 0) e(38);   /* file is now unlocked. */
 355
 356   /* Test F_GETLK. */
 357   if (set(WRITE, 2, 3) != 0) e(39);
 358   if (locked(1) != U) e(40);
 359   if (locked(2) != L) e(41);
 360   if (locked(3) != L) e(42);
 361   if (locked(4) != U) e(43);
 362   if (set(UNLOCK, 2, 3) != 0) e(44);
 363   if (locked(2) != U) e(45);
 364   if (locked(3) != U) e(46);
 365
 366   close(xfd);
 367 }
 368
 369 void test7e()
 370 {
 371 /* Test to see if SETLKW blocks as it should. */
 372
 373   int pid, s;
 374
 375   subtest = 5;
 376
 377   if ( (xfd = creat("T7.e", 0777)) != 3) e(1);
 378   if (close(xfd) != 0) e(2);
 379   if ( (xfd = open("T7.e", O_RDWR)) < 0) e(3);
 380   if (write(xfd, buf, ITEMS) != ITEMS) e(4);
 381   if (set(WRITE, 0, 3) != 0) e(5);
 382
 383   if ( (pid = fork()) ) {
 384         /* Parent waits until child has started before signaling it. */
 385         while (access("T7.e1", 0) != 0) ;
 386         unlink("T7.e1");
 387         sleep(1);
 388         if (kill(pid, SIGKILL) < 0) e(6);
 389         if (wait(&s) != pid) e(7);
 390   } else {
 391         /* Child tries to lock and should block. */
 392         if (creat("T7.e1", 0777) < 0) e(8);
 393         func_code = F_SETLKW;
 394         if (set(WRITE, 0, 3) != 0) e(9);        /* should block */
 395         errno = -1000;
 396         e(10);                  /* process should be killed by signal */
 397         exit(0);                /* should never happen */
 398   }
 399   close(xfd);
 400 }
 401
 402 void test7f()
 403 {
 404 /* Test to see if SETLKW gives EINTR when interrupted. */
 405
 406   int pid, s;
 407
 408   subtest = 6;
 409
 410   if ( (xfd = creat("T7.f", 0777)) != 3) e(1);
 411   if (close(xfd) != 0) e(2);
 412   if ( (xfd = open("T7.f", O_RDWR)) < 0) e(3);
 413   if (write(xfd, buf, ITEMS) != ITEMS) e(4);
 414   if (set(WRITE, 0, 3) != 0) e(5);
 415
 416   if ( (pid = fork()) ) {
 417         /* Parent waits until child has started before signaling it. */
 418         while (access("T7.f1", 0) != 0) ;
 419         unlink("T7.f1");
 420         sleep(1);
 421         if (kill(pid, SIGTERM) < 0) e(6);
 422         if (wait(&s) != pid) e(7);
 423         if ( (s>>8) != 19) e(8);
 424   } else {
 425         /* Child tries to lock and should block.
 426          * `signal(SIGTERM, sigfunc);' to set the signal handler is inadequate
 427          * because on systems like BSD the sigaction flags for signal include
 428          * `SA_RESTART' so syscalls are restarted after they have been
 429          * interrupted by a signal.
 430          */
 431         struct sigaction sa, osa;
 432
 433         sa.sa_handler = sigfunc;
 434         sigemptyset(&sa.sa_mask);
 435         sa.sa_flags = 0;
 436         if (sigaction(SIGTERM, &sa, &osa) < 0) e(999);
 437         if (creat("T7.f1", 0777) < 0) e(9);
 438         func_code = F_SETLKW;
 439         if (set(WRITE, 0, 3) != -1) e(10);      /* should block */
 440         if (errno != EINTR) e(11);      /* signal should release it */
 441         exit(19);
 442   }
 443   close(xfd);
 444 }
 445
 446 void test7g()
 447 {
 448 /* Test to see if SETLKW unlocks when the needed lock becomes available. */
 449
 450   int pid, s;
 451
 452   subtest = 7;
 453
 454   if ( (xfd = creat("T7.g", 0777)) != 3) e(1);
 455   if (close(xfd) != 0) e(2);
 456   if ( (xfd = open("T7.g", O_RDWR)) < 0) e(3);
 457   if (write(xfd, buf, ITEMS) != ITEMS) e(4);
 458   if (set(WRITE, 0, 3) != 0) e(5);      /* bytes 0 to 3 are now locked */
 459
 460   if ( (pid = fork()) ) {
 461         /* Parent waits for child to start. */
 462         while (access("T7.g1", 0) != 0) ;
 463         unlink("T7.g1");
 464         sleep(1);
 465         if (set(UNLOCK, 0, 3) != 0) e(5);
 466         if (wait(&s) != pid) e(6);
 467         if ( (s >> 8) != 29) e(7);
 468   } else {
 469         /* Child tells parent it is alive, then tries to lock and is blocked.*/
 470         func_code = F_SETLKW;
 471         if (creat("T7.g1", 0777) < 0) e(8);
 472         if (set(WRITE, 3, 3) != 0) e(9);        /* process must block now */
 473         if (set(UNLOCK, 3, 3) != 0) e(10);
 474         exit(29);
 475   }
 476   close(xfd);
 477 }
 478
 479 void test7h()
 480 {
 481 /* Test to see what happens if two processed block on the same lock. */
 482
 483   int pid, pid2, s, w;
 484
 485   subtest = 8;
 486
 487   if ( (xfd = creat("T7.h", 0777)) != 3) e(1);
 488   if (close(xfd) != 0) e(2);
 489   if ( (xfd = open("T7.h", O_RDWR)) < 0) e(3);
 490   if (write(xfd, buf, ITEMS) != ITEMS) e(4);
 491   if (set(WRITE, 0, 3) != 0) e(5);      /* bytes 0 to 3 are now locked */
 492
 493   if ( (pid = fork()) ) {
 494         if ( (pid2 = fork()) ) {
 495                 /* Parent waits for child to start. */
 496                 while (access("T7.h1", 0) != 0) ;
 497                 while (access("T7.h2", 0) != 0) ;
 498                 unlink("T7.h1");
 499                 unlink("T7.h2");
 500                 sleep(1);
 501                 if (set(UNLOCK, 0, 3) != 0) e(6);
 502                 w = wait(&s);
 503                 if (w != pid && w != pid2) e(7);
 504                 s = s >> 8;
 505                 if (s != 39 && s != 49) e(8);
 506                 w = wait(&s);
 507                 if (w != pid && w != pid2) e(9);
 508                 s = s >> 8;
 509                 if (s != 39 && s != 49) e(10);
 510         } else {
 511                 func_code = F_SETLKW;
 512                 if (creat("T7.h1", 0777) < 0) e(11);
 513                 if (set(WRITE, 0, 0) != 0) e(12);       /* block now */
 514                 if (set(UNLOCK, 0, 0) != 0) e(13);
 515                 exit(39);
 516         }
 517   } else {
 518         /* Child tells parent it is alive, then tries to lock and is blocked.*/
 519         func_code = F_SETLKW;
 520         if (creat("T7.h2", 0777) < 0) e(14);
 521         if (set(WRITE, 0, 1) != 0) e(15);       /* process must block now */
 522         if (set(UNLOCK, 0, 1) != 0) e(16);
 523         exit(49);
 524   }
 525   close(xfd);
 526 }
 527
 528 void test7i()
 529 {
 530 /* Check error conditions for fcntl(). */
 531
 532   int tfd, i;
 533
 534   subtest = 9;
 535
 536   errno = 0;
 537   if ( (xfd = creat("T7.i", 0777)) != 3) e(1);
 538   if (close(xfd) != 0) e(2);
 539   if ( (xfd = open("T7.i", O_RDWR)) < 0) e(3);
 540   if (write(xfd, buf, ITEMS) != ITEMS) e(4);
 541   if (set(WRITE, 0, 3) != 0) e(5);      /* bytes 0 to 3 are now locked */
 542   if (set(WRITE, 0, 0) != 0) e(6);
 543   if (errno != 0) e(7);
 544   errno = 0;
 545   if (set(WRITE, 3, 3) != 0) e(8);
 546   if (errno != 0) e(9);
 547   tfd = xfd;                    /* hold good value */
 548   xfd = -99;
 549   errno = 0;
 550   if (set(WRITE, 0, 0) != -1) e(10);
 551   if (errno != EBADF) e(11);
 552
 553   errno = 0;
 554   if ( (xfd = open("T7.i", O_WRONLY)) < 0) e(12);
 555   if (set(READ, 0, 0) != -1) e(13);
 556   if (errno != EBADF) e(14);
 557   if (close(xfd) != 0) e(15);
 558
 559   errno = 0;
 560   if ( (xfd = open("T7.i", O_RDONLY)) < 0) e(16);
 561   if (set(WRITE, 0, 0) != -1) e(17);
 562   if (errno != EBADF) e(18);
 563   if (close(xfd) != 0) e(19);
 564   xfd = tfd;                    /* restore legal xfd value */
 565
 566   /* Check for EINVAL. */
 567   errno = 0;
 568   if (fcntl(xfd, F_DUPFD, OPEN_MAX) != -1) e(20);
 569   if (errno != EINVAL) e(21);
 570   errno = 0;
 571   if (fcntl(xfd, F_DUPFD, -1) != -1) e(22);
 572   if (errno != EINVAL) e(23);
 573
 574   xfd = 0;                      /* stdin does not support locking */
 575   errno = 0;
 576   if (set(READ, 0, 0) != -1) e(24);
 577   if (errno != EINVAL) e(25);
 578   xfd = tfd;
 579
 580   /* Check ENOLCK. */
 581   for (i = 0; i < ITEMS; i++) {
 582         if (set(WRITE, i, i) == 0) continue;
 583         if (errno != ENOLCK) {
 584                 e(26);
 585                 break;
 586         }
 587   }
 588
 589   /* Check EMFILE. */
 590   for (i = xfd + 1; i < OPEN_MAX; i++) open("T7.i", 0); /* use up all fds */
 591   errno = 0;
 592   if (fcntl(xfd, F_DUPFD, 0) != -1) e(27);      /* No fds left */
 593   if (errno != EMFILE) e(28);
 594
 595   for (i = xfd; i < OPEN_MAX; i++) if (close(i) != 0) e(29);
 596 }
 597
 598 void test7j()
 599 {
 600 /* Test file locking with two processes. */
 601
 602   int s;
 603
 604   subtest = 10;
 605
 606   if ( (xfd = creat("T7.j", 0777)) != 3) e(1);
 607   close(xfd);
 608   if ( (xfd = open("T7.j", O_RDWR)) < 0) e(2);
 609   if (write(xfd, buf, ITEMS) != ITEMS) e(3);
 610   if (set(WRITE, 0, 4) != 0) e(4);      /* lock belongs to parent */
 611   if (set(READ, 10, 16) != 0) e(5);     /* lock belongs to parent */
 612
 613   /* Up until now, all locks have been disjoint.  Now try conflicts. */
 614   if (fork()) {
 615         /* Parent just waits for child to finish. */
 616         wait(&s);
 617   } else {
 618         /* Child does the testing. */
 619         errno = -100;
 620         if (set(WRITE, 5, 7) < 0) e(6); /* should work */
 621         if (set(WRITE, 4, 7) >= 0) e(7);        /* child may not lock byte 4 */
 622         if (errno != EACCES && errno != EAGAIN) e(8);
 623         if (set(WRITE, 5, 9) != 0) e(9);
 624         if (set(UNLOCK, 5, 9) != 0) e(10);
 625         if (set(READ, 9, 17) < 0) e(11);        /* shared READ lock is ok */
 626         exit(0);
 627   }
 628   close(xfd);
 629 }
 630
 631 void cloexec_test()
 632 {
 633 /* To text whether the FD_CLOEXEC flag actually causes files to be
 634  * closed upon exec, we have to exec something.  The test is carried
 635  * out by forking, and then having the child exec test7 itself, but
 636  * with argument 0.  This is detected, and control comes here.
 637  * File descriptors 3 and 10 should be closed here, and 10 open.
 638  */
 639
 640   if (close(3) == 0) e(1001);   /* close should fail; it was closed on exec */
 641   if (close(6) != 0) e(1002);   /* close should succeed */
 642   if (close(10) == 0) e(1003);  /* close should fail */
 643   fflush(stdout);
 644   exit(0);
 645 }
 646
 647 int set(how, first, last)
 648 int how, first, last;
 649 {
 650   int r;
 651   struct flock flock;
 652
 653   if (how == READ) flock.l_type = F_RDLCK;
 654   if (how == WRITE) flock.l_type = F_WRLCK;
 655   if (how == UNLOCK) flock.l_type = F_UNLCK;
 656   flock.l_whence = whence;
 657   flock.l_start = (long) first;
 658   flock.l_len = (long) last - (long) first + 1;
 659   r = fcntl(xfd, func_code, &flock);
 660   if (r != -1)
 661         return(0);
 662   else
 663         return(-1);
 664 }
 665
 666 int locked(b)
 667 int b;
 668 /* Test to see if byte b is locked.  Return L or U */
 669 {
 670   struct flock flock;
 671   pid_t pid;
 672   int status;
 673
 674   flock.l_type = F_WRLCK;
 675   flock.l_whence = whence;
 676   flock.l_start = (long) b;
 677   flock.l_len = 1;
 678
 679   /* Process' own locks are invisible to F_GETLK, so fork a child to test. */
 680   pid = fork();
 681   if (pid == 0) {
 682         if (fcntl(xfd, F_GETLK, &flock) != 0) e(2000);
 683         exit(flock.l_type == F_UNLCK ? U : L);
 684   }
 685   if (pid == -1) e(2001);
 686   if (fcntl(xfd, F_GETLK, &flock) != 0) e(2002);
 687   if (flock.l_type != F_UNLCK) e(2003);
 688   if (wait(&status) != pid) e(2004);
 689   if (!WIFEXITED(status)) e(2005);
 690   return(WEXITSTATUS(status));
 691 }
 692
 693 void e(n)
 694 int n;
 695 {
 696   int err_num = errno;          /* save errno in case printf clobbers it */
 697
 698   printf("Subtest %d,  error %d  errno=%d  ", subtest, n, errno);
 699   fflush(stdout);
 700   errno = err_num;              /* restore errno, just in case */
 701   perror("");
 702   if (errct++ > MAX_ERROR) {
 703         printf("Too many errors; test aborted\n");
 704         chdir("..");
 705         system("rm -rf DIR*");
 706         exit(1);
 707   }
 708 }
 709
 710 void sigfunc(s)
 711 int s;                          /* for ANSI */
 712 {
 713 }
 714
 715 void quit()
 716 {
 717
 718   chdir("..");
 719   system("rm -rf DIR*");
 720
 721   if (errct == 0) {
 722         printf("ok\n");
 723         exit(0);
 724   } else {
 725         printf("%d errors\n", errct);
 726         exit(1);
 727   }
 728 }