test/test38.c

   1 /* Many of the tests require 1.6.n, n > 16, so we may as well assume that
   2  * POSIX signals are implemented.
   3  */
   4 #define SIGACTION
   5
   6 /* test38: read(), write()      Author: Jan-Mark Wams (jms@cs.vu.nl) */
   7
   8 #include <sys/types.h>
   9 #include <sys/stat.h>
  10 #include <sys/wait.h>
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <string.h>
  14 #include <fcntl.h>
  15 #include <limits.h>
  16 #include <errno.h>
  17 #include <time.h>
  18 #include <signal.h>
  19 #include <stdio.h>
  20
  21 #define MAX_ERROR       4
  22 #define ITERATIONS      3
  23 #define BUF_SIZE 1024
  24
  25 #define System(cmd)     if (system(cmd) != 0) printf("``%s'' failed\n", cmd)
  26 #define Chdir(dir)      if (chdir(dir) != 0) printf("Can't goto %s\n", dir)
  27 #define Stat(a,b)       if (stat(a,b) != 0) printf("Can't stat %s\n", a)
  28
  29 #include "common.c"
  30
  31 int superuser;
  32 int signumber = 0;
  33
  34 void test38a(void);
  35 void test38b(void);
  36 void test38c(void);
  37 void setsignumber(int _signumber);
  38
  39 int main(int argc, char *argv[])
  40 {
  41   int i, m = 0xFFFF;
  42
  43   sync();
  44   start(38);
  45
  46   if (argc == 2) m = atoi(argv[1]);
  47   superuser = (geteuid() == 0);
  48   umask(0000);
  49
  50   for (i = 0; i < ITERATIONS; i++) {
  51         if (m & 0001) test38a();
  52         if (m & 0002) test38b();
  53         if (m & 0004) test38c();
  54   }
  55   quit();
  56
  57   return(-1);   /* Unreachable */
  58 }
  59
  60 void test38a()
  61 {                               /* Try normal operation. */
  62   int fd1;
  63   struct stat st1, st2;
  64   time_t time1;
  65   char buf[BUF_SIZE];
  66   int stat_loc;
  67   int i, j;
  68   int tube[2];
  69
  70   subtest = 1;
  71   System("rm -rf ../DIR_38/*");
  72
  73   /* Let's open bar. */
  74   if ((fd1 = open("bar", O_RDWR | O_CREAT, 0777)) != 3) e(1);
  75   Stat("bar", &st1);
  76
  77   /* Writing nothing should not affect the file at all. */
  78   if (write(fd1, "", 0) != 0) e(2);
  79   Stat("bar", &st2);
  80   if (st1.st_uid != st2.st_uid) e(3);
  81   if (st1.st_gid != st2.st_gid) e(4);   /* should be same */
  82   if (st1.st_mode != st2.st_mode) e(5);
  83   if (st1.st_size != st2.st_size) e(6);
  84   if (st1.st_nlink != st2.st_nlink) e(7);
  85   if (st1.st_mtime != st2.st_mtime) e(8);
  86   if (st1.st_ctime != st2.st_ctime) e(9);
  87   if (st1.st_atime != st2.st_atime) e(10);
  88
  89   /* A write should update some status fields. */
  90   time(&time1);
  91   while (time1 >= time((time_t *)0))
  92         ;
  93   if (write(fd1, "foo", 4) != 4) e(11);
  94   Stat("bar", &st2);
  95   if (st1.st_mode != st2.st_mode) e(12);
  96   if (st1.st_size >= st2.st_size) e(13);
  97   if ((off_t) 4 != st2.st_size) e(14);
  98   if (st1.st_nlink != st2.st_nlink) e(15);
  99   if (st1.st_mtime >= st2.st_mtime) e(16);
 100   if (st1.st_ctime >= st2.st_ctime) e(17);
 101   if (st1.st_atime != st2.st_atime) e(18);
 102
 103   /* Lseeks should not change the file status. */
 104   if (lseek(fd1, (off_t) - 2, SEEK_END) != 2) e(19);
 105   Stat("bar", &st1);
 106   if (st1.st_mode != st2.st_mode) e(20);
 107   if (st1.st_size != st2.st_size) e(21);
 108   if (st1.st_nlink != st2.st_nlink) e(22);
 109   if (st1.st_mtime != st2.st_mtime) e(23);
 110   if (st1.st_ctime != st2.st_ctime) e(24);
 111   if (st1.st_atime != st2.st_atime) e(25);
 112
 113   /* Writing should start at the current (2) position. */
 114   if (write(fd1, "foo", 4) != 4) e(26);
 115   Stat("bar", &st2);
 116   if (st1.st_mode != st2.st_mode) e(27);
 117   if (st1.st_size >= st2.st_size) e(28);
 118   if ((off_t) 6 != st2.st_size) e(29);
 119   if (st1.st_nlink != st2.st_nlink) e(30);
 120   if (st1.st_mtime > st2.st_mtime) e(31);
 121   if (st1.st_ctime > st2.st_ctime) e(32);
 122   if (st1.st_atime != st2.st_atime) e(33);
 123
 124   /* A read of zero bytes should not affect anything. */
 125   if (read(fd1, buf, 0) != 0) e(34);
 126   Stat("bar", &st1);
 127   if (st1.st_uid != st2.st_uid) e(35);
 128   if (st1.st_gid != st2.st_gid) e(36);  /* should be same */
 129   if (st1.st_mode != st2.st_mode) e(37);
 130   if (st1.st_size != st2.st_size) e(38);
 131   if (st1.st_nlink != st2.st_nlink) e(39);
 132   if (st1.st_mtime != st2.st_mtime) e(40);
 133   if (st1.st_ctime != st2.st_ctime) e(41);
 134   if (st1.st_atime != st2.st_atime) e(42);
 135
 136   /* The file now should contain ``fofoo\0'' Let's check that. */
 137   if (lseek(fd1, (off_t) 0, SEEK_SET) != 0) e(43);
 138   if (read(fd1, buf, BUF_SIZE) != 6) e(44);
 139   if (strcmp(buf, "fofoo") != 0) e(45);
 140
 141   /* Only the Access Time should be updated. */
 142   Stat("bar", &st2);
 143   if (st1.st_mtime != st2.st_mtime) e(46);
 144   if (st1.st_ctime != st2.st_ctime) e(47);
 145   if (st1.st_atime >= st2.st_atime) e(48);
 146
 147   /* A read of zero bytes should do nothing even at the end of the file. */
 148   time(&time1);
 149   while (time1 >= time((time_t *)0))
 150         ;
 151   if (read(fd1, buf, 0) != 0) e(49);
 152   Stat("bar", &st1);
 153   if (st1.st_size != st2.st_size) e(50);
 154   if (st1.st_mtime != st2.st_mtime) e(51);
 155   if (st1.st_ctime != st2.st_ctime) e(52);
 156   if (st1.st_atime != st2.st_atime) e(53);
 157
 158   /* Reading should be done from the current offset. */
 159   if (read(fd1, buf, BUF_SIZE) != 0) e(54);
 160   if (lseek(fd1, (off_t) 2, SEEK_SET) != 2) e(55);
 161   if (read(fd1, buf, BUF_SIZE) != 4) e(56);
 162   if (strcmp(buf, "foo") != 0) e(57);
 163
 164   /* Reading should effect the current file position. */
 165   if (lseek(fd1, (off_t) 2, SEEK_SET) != 2) e(58);
 166   if (read(fd1, buf, 1) != 1) e(59);
 167   if (*buf != 'f') e(60);
 168   if (lseek(fd1, (off_t) 0, SEEK_CUR) != 3) e(61);
 169   if (read(fd1, buf, 1) != 1) e(62);
 170   if (*buf != 'o') e(63);
 171   if (lseek(fd1, (off_t) 0, SEEK_CUR) != 4) e(64);
 172   if (read(fd1, buf, 1) != 1) e(65);
 173   if (*buf != 'o') e(66);
 174   if (lseek(fd1, (off_t) 0, SEEK_CUR) != 5) e(67);
 175   if (read(fd1, buf, 1) != 1) e(68);
 176   if (*buf != '\0') e(69);
 177   if (lseek(fd1, (off_t) 0, SEEK_CUR) != 6) e(70);
 178
 179   /* Read's at EOF should return 0. */
 180   if (read(fd1, buf, BUF_SIZE) != 0) e(71);
 181   if (lseek(fd1, (off_t) 0, SEEK_CUR) != 6) e(72);
 182   if (read(fd1, buf, BUF_SIZE) != 0) e(73);
 183   if (lseek(fd1, (off_t) 0, SEEK_CUR) != 6) e(74);
 184   if (read(fd1, buf, BUF_SIZE) != 0) e(75);
 185   if (lseek(fd1, (off_t) 0, SEEK_CUR) != 6) e(76);
 186   if (read(fd1, buf, BUF_SIZE) != 0) e(77);
 187   if (lseek(fd1, (off_t) 0, SEEK_CUR) != 6) e(78);
 188   if (read(fd1, buf, BUF_SIZE) != 0) e(79);
 189   if (lseek(fd1, (off_t) 0, SEEK_CUR) != 6) e(80);
 190
 191   /* Writing should not always change the file size. */
 192   if (lseek(fd1, (off_t) 2, SEEK_SET) != 2) e(81);
 193   if (write(fd1, "ba", 2) != 2) e(82);
 194   if (lseek(fd1, (off_t) 0, SEEK_CUR) != 4) e(83);
 195   Stat("bar", &st1);
 196   if (st1.st_size != 6) e(84);
 197
 198   /* Kill the \0 at the end. */
 199   if (lseek(fd1, (off_t) 5, SEEK_SET) != 5) e(85);
 200   if (write(fd1, "x", 1) != 1) e(86);
 201
 202   /* And close the bar. */
 203   if (close(fd1) != 0) e(87);
 204
 205   /* Try some stuff with O_APPEND. Bar contains ``fobaox'' */
 206   if ((fd1 = open("bar", O_RDWR | O_APPEND)) != 3) e(88);
 207
 208   /* No matter what the file position is. Writes should append. */
 209   if (lseek(fd1, (off_t) 2, SEEK_SET) != 2) e(89);
 210   if (write(fd1, "y", 1) != 1) e(90);
 211   Stat("bar", &st1);
 212   if (st1.st_size != (off_t) 7) e(91);
 213   if (lseek(fd1, (off_t) 0, SEEK_CUR) != 7) e(92);
 214   if (lseek(fd1, (off_t) 2, SEEK_SET) != 2) e(93);
 215   if (write(fd1, "z", 2) != 2) e(94);
 216
 217   /* The file should contain ``fobaoxyz\0'' == 9 chars long. */
 218   Stat("bar", &st1);
 219   if (st1.st_size != (off_t) 9) e(95);
 220   if (lseek(fd1, (off_t) 0, SEEK_CUR) != 9) e(96);
 221
 222   /* Reading on a O_APPEND flag should be from the current offset. */
 223   if (lseek(fd1, (off_t) 0, SEEK_SET) != 0) e(97);
 224   if (read(fd1, buf, BUF_SIZE) != 9) e(98);
 225   if (strcmp(buf, "fobaoxyz") != 0) e(99);
 226   if (lseek(fd1, (off_t) 0, SEEK_CUR) != 9) e(100);
 227
 228   if (close(fd1) != 0) e(101);
 229
 230   /* Let's test fifo writes. First blocking. */
 231   if (mkfifo("fifo", 0777) != 0) e(102);
 232
 233   /* Read from fifo but no writer. */
 234   System("rm -rf /tmp/sema.38a");
 235   switch (fork()) {
 236       case -1:  printf("Can't fork\n"); break;
 237
 238       case 0:
 239         alarm(20);
 240         if ((fd1 = open("fifo", O_RDONLY)) != 3) e(103);
 241         system("> /tmp/sema.38a");
 242         system("while test -f /tmp/sema.38a; do sleep 1; done");
 243 errno =0;
 244         if (read(fd1, buf, BUF_SIZE) != 0) e(104);
 245         if (read(fd1, buf, BUF_SIZE) != 0) e(105);
 246         if (read(fd1, buf, BUF_SIZE) != 0) e(106);
 247         if (close(fd1) != 0) e(107);
 248         exit(0);
 249
 250       default:
 251         if ((fd1 = open("fifo", O_WRONLY)) != 3) e(108);
 252         while (stat("/tmp/sema.38a", &st1) != 0) sleep(1);
 253         if (close(fd1) != 0) e(109);
 254         unlink("/tmp/sema.38a");
 255         if (wait(&stat_loc) == -1) e(110);
 256         if (stat_loc != 0) e(111);      /* Alarm? */
 257   }
 258
 259   /* Read from fifo should wait for writer. */
 260   switch (fork()) {
 261       case -1:  printf("Can't fork\n"); break;
 262
 263       case 0:
 264         alarm(20);
 265         if ((fd1 = open("fifo", O_RDONLY)) != 3) e(112);
 266         if (read(fd1, buf, BUF_SIZE) != 10) e(113);
 267         if (strcmp(buf, "Hi reader") != 0) e(114);
 268         if (close(fd1) != 0) e(115);
 269         exit(0);
 270
 271       default:
 272         if ((fd1 = open("fifo", O_WRONLY)) != 3) e(116);
 273         sleep(1);
 274         if (write(fd1, "Hi reader", 10) != 10) e(117);
 275         if (close(fd1) != 0) e(118);
 276         if (wait(&stat_loc) == -1) e(119);
 277         if (stat_loc != 0) e(120);      /* Alarm? */
 278   }
 279
 280 #if DEAD_CODE
 281   /* Does this test test what it is supposed to test??? */
 282
 283   /* Read from fifo should wait for all writers to close. */
 284   switch (fork()) {
 285       case -1:  printf("Can't fork\n"); break;
 286
 287       case 0:
 288         alarm(60);
 289         switch (fork()) {
 290             case -1:    printf("Can't fork\n"); break;
 291             case 0:
 292                 alarm(20);
 293                 if ((fd1 = open("fifo", O_WRONLY)) != 3) e(121);
 294                 printf("C2 did open\n");
 295                 if (close(fd1) != 0) e(122);
 296                 printf("C2 did close\n");
 297                 exit(0);
 298             default:
 299                 printf("C1 scheduled\n");
 300                 if ((fd1 = open("fifo", O_WRONLY)) != 3) e(123);
 301                 printf("C1 did open\n");
 302                 sleep(2);
 303                 if (close(fd1) != 0) e(124);
 304                 printf("C1 did close\n");
 305                 sleep(1);
 306                 if (wait(&stat_loc) == -1) e(125);
 307                 if (stat_loc != 0) e(126);      /* Alarm? */
 308         }
 309         exit(stat_loc);
 310
 311       default: {
 312         int wait_status;
 313         printf("Parent running\n");
 314         sleep(1);                               /* open in childs first */
 315         if ((fd1 = open("fifo", O_RDONLY)) != 3) e(127);
 316         if (read(fd1, buf, BUF_SIZE) != 0) e(128);
 317         if (close(fd1) != 0) e(129);
 318         printf("Parent closed\n");
 319         if ((wait_status=wait(&stat_loc)) == -1) e(130);
 320
 321       printf("wait_status %d, stat_loc %d:", wait_status, stat_loc);
 322       if (WIFSIGNALED(stat_loc)) {
 323           printf(" killed, signal number %d\n", WTERMSIG(stat_loc));
 324       }
 325       else if (WIFEXITED(stat_loc)) {
 326           printf(" normal exit, status %d\n", WEXITSTATUS(stat_loc));
 327       }
 328
 329         if (stat_loc != 0) e(131);      /* Alarm? */
 330       }
 331   }
 332 #endif
 333
 334   /* PIPE_BUF has to have a nice value. */
 335   if (PIPE_BUF < 5) e(132);
 336   if (BUF_SIZE < 1000) e(133);
 337
 338   /* Writes of blocks smaller than PIPE_BUF should be atomic. */
 339   System("rm -rf /tmp/sema.38b;> /tmp/sema.38b");
 340   switch (fork()) {
 341       case -1:  printf("Can't fork\n"); break;
 342
 343       case 0:
 344         alarm(20);
 345         switch (fork()) {
 346             case -1:    printf("Can't fork\n"); break;
 347
 348             case 0:
 349                 alarm(20);
 350                 if ((fd1 = open("fifo", O_WRONLY)) != 3) e(134);
 351                 for (i = 0; i < 100; i++) write(fd1, "1234 ", 5);
 352                 system("while test -f /tmp/sema.38b; do sleep 1; done");
 353                 if (close(fd1) != 0) e(135);
 354                 exit(0);
 355
 356             default:
 357                 if ((fd1 = open("fifo", O_WRONLY)) != 3) e(136);
 358                 for (i = 0; i < 100; i++) write(fd1, "1234 ", 5);
 359                 while (stat("/tmp/sema.38b", &st1) == 0) sleep(1);
 360                 if (close(fd1) != 0) e(137);
 361                 if (wait(&stat_loc) == -1) e(138);
 362                 if (stat_loc != 0) e(139);      /* Alarm? */
 363         }
 364         exit(stat_loc);
 365
 366       default:
 367         if ((fd1 = open("fifo", O_RDONLY)) != 3) e(140);
 368         i = 0;
 369         memset(buf, '\0', BUF_SIZE);
 370
 371         /* Read buffer full or till EOF. */
 372         do {
 373                 j = read(fd1, buf + i, BUF_SIZE - i);
 374                 if (j > 0) {
 375                         if (j % 5 != 0) e(141);
 376                         i += j;
 377                 }
 378         } while (j > 0 && i < 1000);
 379
 380         /* Signal the children to close write ends. This should not be */
 381         /* Necessary. But due to a bug in 1.16.6 this is necessary. */
 382         unlink("/tmp/sema.38b");
 383         if (j < 0) e(142);
 384         if (i != 1000) e(143);
 385         if (wait(&stat_loc) == -1) e(144);
 386         if (stat_loc != 0) e(145);      /* Alarm? */
 387
 388         /* Check 200 times 1234. */
 389         for (i = 0; i < 200; i++)
 390                 if (strncmp(buf + (i * 5), "1234 ", 5) != 0) break;
 391         if (i != 200) e(146);
 392         if (buf[1000] != '\0') e(147);
 393         if (buf[1005] != '\0') e(148);
 394         if (buf[1010] != '\0') e(149);
 395         if (read(fd1, buf, BUF_SIZE) != 0) e(150);
 396         if (close(fd1) != 0) e(151);
 397   }
 398
 399   /* Read from pipe should wait for writer. */
 400   if (pipe(tube) != 0) e(152);
 401   switch (fork()) {
 402       case -1:  printf("Can't fork\n"); break;
 403       case 0:
 404         alarm(20);
 405         if (close(tube[1]) != 0) e(153);
 406         if (read(tube[0], buf, BUF_SIZE) != 10) e(154);
 407         if (strcmp(buf, "Hi reader") != 0) e(155);
 408         if (close(tube[0]) != 0) e(156);
 409         exit(0);
 410       default:
 411         if (close(tube[0]) != 0) e(157);
 412         sleep(1);
 413         if (write(tube[1], "Hi reader", 10) != 10) e(158);
 414         if (close(tube[1]) != 0) e(159);
 415         if (wait(&stat_loc) == -1) e(160);
 416         if (stat_loc != 0) e(161);      /* Alarm? */
 417   }
 418
 419   /* Read from pipe should wait for all writers to close. */
 420   if (pipe(tube) != 0) e(162);
 421   switch (fork()) {
 422       case -1:  printf("Can't fork\n"); break;
 423       case 0:
 424         alarm(20);
 425         if (close(tube[0]) != 0) e(163);
 426         switch (fork()) {
 427             case -1:    printf("Can't fork\n"); break;
 428             case 0:
 429                 alarm(20);
 430                 if (close(tube[1]) != 0) e(164);
 431                 exit(0);
 432             default:
 433                 sleep(1);
 434                 if (close(tube[1]) != 0) e(165);
 435                 if (wait(&stat_loc) == -1) e(166);
 436                 if (stat_loc != 0) e(167);      /* Alarm? */
 437         }
 438         exit(stat_loc);
 439       default:
 440         if (close(tube[1]) != 0) e(168);
 441         if (read(tube[0], buf, BUF_SIZE) != 0) e(169);
 442         if (close(tube[0]) != 0) e(170);
 443         if (wait(&stat_loc) == -1) e(171);
 444         if (stat_loc != 0) e(172);      /* Alarm? */
 445   }
 446
 447   /* Writes of blocks smaller than PIPE_BUF should be atomic. */
 448   System("rm -rf /tmp/sema.38c;> /tmp/sema.38c");
 449   if (pipe(tube) != 0) e(173);
 450   switch (fork()) {
 451       case -1:  printf("Can't fork\n"); break;
 452       case 0:
 453         alarm(20);
 454         if (close(tube[0]) != 0) e(174);
 455         switch (fork()) {
 456             case -1:    printf("Can't fork\n"); break;
 457             case 0:
 458                 alarm(20);
 459                 for (i = 0; i < 100; i++) write(tube[1], "1234 ", 5);
 460                 system("while test -f /tmp/sema.38c; do sleep 1; done");
 461                 if (close(tube[1]) != 0) e(175);
 462                 exit(0);
 463             default:
 464                 for (i = 0; i < 100; i++) write(tube[1], "1234 ", 5);
 465                 while (stat("/tmp/sema.38c", &st1) == 0) sleep(1);
 466                 if (close(tube[1]) != 0) e(176);
 467                 if (wait(&stat_loc) == -1) e(177);
 468                 if (stat_loc != 0) e(178);      /* Alarm? */
 469         }
 470         exit(stat_loc);
 471       default:
 472         i = 0;
 473         if (close(tube[1]) != 0) e(179);
 474         memset(buf, '\0', BUF_SIZE);
 475         do {
 476                 j = read(tube[0], buf + i, BUF_SIZE - i);
 477                 if (j > 0) {
 478                         if (j % 5 != 0) e(180);
 479                         i += j;
 480                 } else
 481                         break;  /* EOF seen. */
 482         } while (i < 1000);
 483         unlink("/tmp/sema.38c");
 484         if (j < 0) e(181);
 485         if (i != 1000) e(182);
 486         if (close(tube[0]) != 0) e(183);
 487         if (wait(&stat_loc) == -1) e(184);
 488         if (stat_loc != 0) e(185);      /* Alarm? */
 489
 490         /* Check 200 times 1234. */
 491         for (i = 0; i < 200; i++)
 492                 if (strncmp(buf + (i * 5), "1234 ", 5) != 0) break;
 493         if (i != 200) e(186);
 494   }
 495 }
 496
 497 void test38b()
 498 {
 499   int i, fd, stat_loc;
 500   char buf[BUF_SIZE];
 501   char buf2[BUF_SIZE];
 502   struct stat st;
 503
 504   subtest = 2;
 505   System("rm -rf ../DIR_38/*");
 506
 507   /* Lets try sequential writes. */
 508   system("rm -rf /tmp/sema.38d");
 509   System("> testing");
 510   switch (fork()) {
 511       case -1:  printf("Can't fork\n"); break;
 512       case 0:
 513         alarm(20);
 514         if ((fd = open("testing", O_WRONLY | O_APPEND)) != 3) e(1);
 515         if (write(fd, "one ", 4) != 4) e(2);
 516         if (close(fd) != 0) e(3);
 517         system("> /tmp/sema.38d");
 518         system("while test -f /tmp/sema.38d; do sleep 1; done");
 519         if ((fd = open("testing", O_WRONLY | O_APPEND)) != 3) e(4);
 520         if (write(fd, "three ", 6) != 6) e(5);
 521         if (close(fd) != 0) e(6);
 522         system("> /tmp/sema.38d");
 523         exit(0);
 524       default:
 525         while (stat("/tmp/sema.38d", &st) != 0) sleep(1);
 526         if ((fd = open("testing", O_WRONLY | O_APPEND)) != 3) e(7);
 527         if (write(fd, "two ", 4) != 4) e(8);
 528         if (close(fd) != 0) e(9);
 529         unlink("/tmp/sema.38d");
 530         while (stat("/tmp/sema.38d", &st) != 0) sleep(1);
 531         if ((fd = open("testing", O_WRONLY | O_APPEND)) != 3) e(10);
 532         if (write(fd, "four", 5) != 5) e(11);
 533         if (close(fd) != 0) e(12);
 534         if (wait(&stat_loc) == -1) e(13);
 535         if (stat_loc != 0) e(14);       /* The alarm went off? */
 536         unlink("/tmp/sema.38d");
 537   }
 538   if ((fd = open("testing", O_RDONLY)) != 3) e(15);
 539   if (read(fd, buf, BUF_SIZE) != 19) e(16);
 540   if (strcmp(buf, "one two three four") != 0) e(17);
 541   if (close(fd) != 0) e(18);
 542
 543   /* Non written bytes in regular files should be zero. */
 544   memset(buf2, '\0', BUF_SIZE);
 545   if ((fd = open("bigfile", O_RDWR | O_CREAT, 0644)) != 3) e(19);
 546   if (lseek(fd, (off_t) 102400, SEEK_SET) != (off_t) 102400L) e(20);
 547   if (read(fd, buf, BUF_SIZE) != 0) e(21);
 548   if (write(fd, ".", 1) != 1) e(22);
 549   Stat("bigfile", &st);
 550   if (st.st_size != (off_t) 102401) e(23);
 551   if (lseek(fd, (off_t) 0, SEEK_SET) != 0) e(24);
 552   for (i = 0; i < 102400 / BUF_SIZE; i++) {
 553         if (read(fd, buf, BUF_SIZE) != BUF_SIZE) e(25);
 554         if (memcmp(buf, buf2, BUF_SIZE) != 0) e(26);
 555   }
 556   if (close(fd) != 0) e(27);
 557 }
 558
 559 void test38c()
 560 {                               /* Test correct error behavior. */
 561   char buf[BUF_SIZE];
 562   int fd, tube[2], stat_loc;
 563   struct stat st;
 564   pid_t pid;
 565 #ifdef SIGACTION
 566   struct sigaction act, oact;
 567 #else
 568   void (*oldfunc) (int);
 569 #endif
 570
 571   subtest = 3;
 572   System("rm -rf ../DIR_38/*");
 573
 574   /* To test if writing processes on closed pipes are signumbered. */
 575 #ifdef SIGACTION
 576   act.sa_handler = setsignumber;
 577   sigemptyset(&act.sa_mask);
 578   act.sa_flags = 0;
 579   if (sigaction(SIGPIPE, &act, &oact) != 0) e(1);
 580 #else
 581   oldfunc = signal(SIGPIPE, setsignumber);
 582 #endif
 583
 584   /* Non valid file descriptors should be an error. */
 585   for (fd = -111; fd < 0; fd++) {
 586         errno = 0;
 587         if (read(fd, buf, BUF_SIZE) != -1) e(2);
 588         if (errno != EBADF) e(3);
 589   }
 590   for (fd = 3; fd < 111; fd++) {
 591         errno = 0;
 592         if (read(fd, buf, BUF_SIZE) != -1) e(4);
 593         if (errno != EBADF) e(5);
 594   }
 595   for (fd = -111; fd < 0; fd++) {
 596         errno = 0;
 597         if (write(fd, buf, BUF_SIZE) != -1) e(6);
 598         if (errno != EBADF) e(7);
 599   }
 600   for (fd = 3; fd < 111; fd++) {
 601         errno = 0;
 602         if (write(fd, buf, BUF_SIZE) != -1) e(8);
 603         if (errno != EBADF) e(9);
 604   }
 605
 606   /* Writing a pipe with no readers should trigger SIGPIPE. */
 607   if (pipe(tube) != 0) e(10);
 608   close(tube[0]);
 609   switch (fork()) {
 610       case -1:  printf("Can't fork\n"); break;
 611       case 0:
 612         alarm(20);
 613         signumber = 0;
 614         if (write(tube[1], buf, BUF_SIZE) != -1) e(11);
 615         if (errno != EPIPE) e(12);
 616         if (signumber != SIGPIPE) e(13);
 617         if (close(tube[1]) != 0) e(14);
 618         exit(0);
 619       default:
 620         close(tube[1]);
 621         if (wait(&stat_loc) == -1) e(15);
 622         if (stat_loc != 0) e(16);       /* Alarm? */
 623   }
 624
 625   /* Writing a fifo with no readers should trigger SIGPIPE. */
 626   System("> /tmp/sema.38e");
 627   if (mkfifo("fifo", 0666) != 0) e(17);
 628   switch (fork()) {
 629       case -1:  printf("Can't fork\n"); break;
 630       case 0:
 631         alarm(20);
 632         if ((fd = open("fifo", O_WRONLY)) != 3) e(18);
 633         system("while test -f /tmp/sema.38e; do sleep 1; done");
 634         signumber = 0;
 635         if (write(fd, buf, BUF_SIZE) != -1) e(19);
 636         if (errno != EPIPE) e(20);
 637         if (signumber != SIGPIPE) e(21);
 638         if (close(fd) != 0) e(22);
 639         exit(0);
 640       default:
 641         if ((fd = open("fifo", O_RDONLY)) != 3) e(23);
 642         if (close(fd) != 0) e(24);
 643         unlink("/tmp/sema.38e");
 644         if (wait(&stat_loc) == -1) e(25);
 645         if (stat_loc != 0) e(26);       /* Alarm? */
 646   }
 647
 648 #ifdef SIGACTION
 649   /* Restore normal (re)action to SIGPIPE. */
 650   if (sigaction(SIGPIPE, &oact, NULL) != 0) e(27);
 651 #else
 652   signal(SIGPIPE, oldfunc);
 653 #endif
 654
 655   /* Read from fifo should return -1 and set errno to EAGAIN. */
 656   System("rm -rf /tmp/sema.38[fgh]");
 657   switch (fork()) {
 658       case -1:  printf("Can't fork\n"); break;
 659       case 0:
 660         alarm(20);
 661         system("while test ! -f /tmp/sema.38f; do sleep 1; done");
 662         System("rm -rf /tmp/sema.38f");
 663         if ((fd = open("fifo", O_WRONLY | O_NONBLOCK)) != 3) e(28);
 664         close(creat("/tmp/sema.38g", 0666));
 665         system("while test ! -f /tmp/sema.38h; do sleep 1; done");
 666         if (close(fd) != 0) e(38);
 667         System("rm -rf /tmp/sema.38h");
 668         exit(0);
 669       default:
 670         if ((fd = open("fifo", O_RDONLY | O_NONBLOCK)) != 3) e(30);
 671         close(creat("/tmp/sema.38f", 0666));
 672         system("while test ! -f /tmp/sema.38g; do sleep 1; done");
 673         System("rm -rf /tmp/sema.38g");
 674         if (read(fd, buf, BUF_SIZE) != -1) e(31);
 675         if (errno != EAGAIN) e(32);
 676         if (read(fd, buf, BUF_SIZE) != -1) e(33);
 677         if (errno != EAGAIN) e(34);
 678         if (read(fd, buf, BUF_SIZE) != -1) e(35);
 679         if (errno != EAGAIN) e(36);
 680         close(creat("/tmp/sema.38h", 0666));
 681         while (stat("/tmp/sema.38h", &st) == 0) sleep(1);
 682         if (read(fd, buf, BUF_SIZE) != 0) e(37);
 683         if (close(fd) != 0) e(38);
 684         if (wait(&stat_loc) == -1) e(39);
 685         if (stat_loc != 0) e(40);       /* Alarm? */
 686   }
 687   System("rm -rf fifo");
 688
 689   /* If a read is interrupted by a SIGNAL. */
 690   if (pipe(tube) != 0) e(41);
 691   switch (pid = fork()) {
 692       case -1:  printf("Can't fork\n"); break;
 693       case 0:
 694         alarm(20);
 695 #ifdef SIGACTION
 696         act.sa_handler = setsignumber;
 697         sigemptyset(&act.sa_mask);
 698         act.sa_flags = 0;
 699         if (sigaction(SIGUSR1, &act, &oact) != 0) e(42);
 700 #else
 701         oldfunc = signal(SIGUSR1, setsignumber);
 702 #endif
 703         if (read(tube[0], buf, BUF_SIZE) != -1) e(43);
 704         if (errno != EINTR) e(44);
 705         if (signumber != SIGUSR1) e(45);
 706 #ifdef SIGACTION
 707         /* Restore normal (re)action to SIGPIPE. */
 708         if (sigaction(SIGUSR1, &oact, NULL) != 0) e(46);
 709 #else
 710         signal(SIGUSR1, oldfunc);
 711 #endif
 712         close(tube[0]);
 713         close(tube[1]);
 714         exit(0);
 715       default:
 716         /* The sleep 1 should give the child time to start the read. */
 717         sleep(1);
 718         close(tube[0]);
 719         kill(pid, SIGUSR1);
 720         wait(&stat_loc);
 721         if (stat_loc != 0) e(47);       /* Alarm? */
 722         close(tube[1]);
 723   }
 724 }
 725
 726 void setsignumber(signum)
 727 int signum;
 728 {
 729   signumber = signum;
 730 }
 731