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