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