tests/append-over-page.c

   1 /*
   2  * Copyright (c) 1995 - 2000 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 #endif
  37
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <errno.h>
  42
  43 #include <sys/types.h>
  44 #include <sys/stat.h>
  45 #include <sys/mman.h>
  46 #include <fcntl.h>
  47 #include <unistd.h>
  48 #include <dirent.h>
  49
  50 #include <roken.h>
  51
  52 #include <err.h>
  53
  54 #ifndef MAP_FAILED
  55 #define MAP_FAILED ((void *)-1)
  56 #endif
  57
  58 RCSID("$Id$");
  59
  60 static char long_buf[] =
  61 "1000\n"
  62 "1001\n"
  63 "1002\n"
  64 "1003\n"
  65 "1004\n"
  66 "1005\n"
  67 "1006\n"
  68 "1007\n"
  69 "1008\n"
  70 "1009\n"
  71 "1010\n"
  72 "1011\n"
  73 "1012\n"
  74 "1013\n"
  75 "1014\n"
  76 "1015\n"
  77 "1016\n"
  78 "1017\n"
  79 "1018\n"
  80 "1019\n"
  81 "1020\n"
  82 "1021\n"
  83 "1022\n"
  84 "1023\n"
  85 "1024\n"
  86 "1025\n"
  87 "1026\n"
  88 "1027\n"
  89 "1028\n"
  90 "1029\n"
  91 "1030\n"
  92 "1031\n"
  93 "1032\n"
  94 "1033\n"
  95 "1034\n"
  96 "1035\n"
  97 "1036\n"
  98 "1037\n"
  99 "1038\n"
 100 "1039\n"
 101 "1040\n"
 102 "1041\n"
 103 "1042\n"
 104 "1043\n"
 105 "1044\n"
 106 "1045\n"
 107 "1046\n"
 108 "1047\n"
 109 "1048\n"
 110 "1049\n"
 111 "1050\n"
 112 "1051\n"
 113 "1052\n"
 114 "1053\n"
 115 "1054\n"
 116 "1055\n"
 117 "1056\n"
 118 "1057\n"
 119 "1058\n"
 120 "1059\n"
 121 "1060\n"
 122 "1061\n"
 123 "1062\n"
 124 "1063\n"
 125 "1064\n"
 126 "1065\n"
 127 "1066\n"
 128 "1067\n"
 129 "1068\n"
 130 "1069\n"
 131 "1070\n"
 132 "1071\n"
 133 "1072\n"
 134 "1073\n"
 135 "1074\n"
 136 "1075\n"
 137 "1076\n"
 138 "1077\n"
 139 "1078\n"
 140 "1079\n"
 141 "1080\n"
 142 "1081\n"
 143 "1082\n"
 144 "1083\n"
 145 "1084\n"
 146 "1085\n"
 147 "1086\n"
 148 "1087\n"
 149 "1088\n"
 150 "1089\n"
 151 "1090\n"
 152 "1091\n"
 153 "1092\n"
 154 "1093\n"
 155 "1094\n"
 156 "1095\n"
 157 "1096\n"
 158 "1097\n"
 159 "1098\n"
 160 "1099\n"
 161 "1100\n"
 162 "1101\n"
 163 "1102\n"
 164 "1103\n"
 165 "1104\n"
 166 "1105\n"
 167 "1106\n"
 168 "1107\n"
 169 "1108\n"
 170 "1109\n"
 171 "1110\n"
 172 "1111\n"
 173 "1112\n"
 174 "1113\n"
 175 "1114\n"
 176 "1115\n"
 177 "1116\n"
 178 "1117\n"
 179 "1118\n"
 180 "1119\n"
 181 "1120\n"
 182 "1121\n"
 183 "1122\n"
 184 "1123\n"
 185 "1124\n"
 186 "1125\n"
 187 "1126\n"
 188 "1127\n"
 189 "1128\n"
 190 "1129\n"
 191 "1130\n"
 192 "1131\n"
 193 "1132\n"
 194 "1133\n"
 195 "1134\n"
 196 "1135\n"
 197 "1136\n"
 198 "1137\n"
 199 "1138\n"
 200 "1139\n"
 201 "1140\n"
 202 "1141\n"
 203 "1142\n"
 204 "1143\n"
 205 "1144\n"
 206 "1145\n"
 207 "1146\n"
 208 "1147\n"
 209 "1148\n"
 210 "1149\n"
 211 "1150\n"
 212 "1151\n"
 213 "1152\n"
 214 "1153\n"
 215 "1154\n"
 216 "1155\n"
 217 "1156\n"
 218 "1157\n"
 219 "1158\n"
 220 "1159\n"
 221 "1160\n"
 222 "1161\n"
 223 "1162\n"
 224 "1163\n"
 225 "1164\n"
 226 "1165\n"
 227 "1166\n"
 228 "1167\n"
 229 "1168\n"
 230 "1169\n"
 231 "1170\n"
 232 "1171\n"
 233 "1172\n"
 234 "1173\n"
 235 "1174\n"
 236 "1175\n"
 237 "1176\n"
 238 "1177\n"
 239 "1178\n"
 240 "1179\n"
 241 "1180\n"
 242 "1181\n"
 243 "1182\n"
 244 "1183\n"
 245 "1184\n"
 246 "1185\n"
 247 "1186\n"
 248 "1187\n"
 249 "1188\n"
 250 "1189\n"
 251 "1190\n"
 252 "1191\n"
 253 "1192\n"
 254 "1193\n"
 255 "1194\n"
 256 "1195\n"
 257 "1196\n"
 258 "1197\n"
 259 "1198\n"
 260 "1199\n"
 261 "1200\n"
 262 "1201\n"
 263 "1202\n"
 264 "1203\n"
 265 "1204\n"
 266 "1205\n"
 267 "1206\n"
 268 "1207\n"
 269 "1208\n"
 270 "1209\n"
 271 "1210\n"
 272 "1211\n"
 273 "1212\n"
 274 "1213\n"
 275 "1214\n"
 276 "1215\n"
 277 "1216\n"
 278 "1217\n"
 279 "1218\n"
 280 "1219\n"
 281 "1220\n"
 282 "1221\n"
 283 "1222\n"
 284 "1223\n"
 285 "1224\n"
 286 "1225\n"
 287 "1226\n"
 288 "1227\n"
 289 "1228\n"
 290 "1229\n"
 291 "1230\n"
 292 "1231\n"
 293 "1232\n"
 294 "1233\n"
 295 "1234\n"
 296 "1235\n"
 297 "1236\n"
 298 "1237\n"
 299 "1238\n"
 300 "1239\n"
 301 "1240\n"
 302 "1241\n"
 303 "1242\n"
 304 "1243\n"
 305 "1244\n"
 306 "1245\n"
 307 "1246\n"
 308 "1247\n"
 309 "1248\n"
 310 "1249\n"
 311 "1250\n"
 312 "1251\n"
 313 "1252\n"
 314 "1253\n"
 315 "1254\n"
 316 "1255\n"
 317 "1256\n"
 318 "1257\n"
 319 "1258\n"
 320 "1259\n"
 321 "1260\n"
 322 "1261\n"
 323 "1262\n"
 324 "1263\n"
 325 "1264\n"
 326 "1265\n"
 327 "1266\n"
 328 "1267\n"
 329 "1268\n"
 330 "1269\n"
 331 "1270\n"
 332 "1271\n"
 333 "1272\n"
 334 "1273\n"
 335 "1274\n"
 336 "1275\n"
 337 "1276\n"
 338 "1277\n"
 339 "1278\n"
 340 "1279\n"
 341 "1280\n"
 342 "1281\n"
 343 "1282\n"
 344 "1283\n"
 345 "1284\n"
 346 "1285\n"
 347 "1286\n"
 348 "1287\n"
 349 "1288\n"
 350 "1289\n"
 351 "1290\n"
 352 "1291\n"
 353 "1292\n"
 354 "1293\n"
 355 "1294\n"
 356 "1295\n"
 357 "1296\n"
 358 "1297\n"
 359 "1298\n"
 360 "1299\n"
 361 "1300\n"
 362 "1301\n"
 363 "1302\n"
 364 "1303\n"
 365 "1304\n"
 366 "1305\n"
 367 "1306\n"
 368 "1307\n"
 369 "1308\n"
 370 "1309\n"
 371 "1310\n"
 372 "1311\n"
 373 "1312\n"
 374 "1313\n"
 375 "1314\n"
 376 "1315\n"
 377 "1316\n"
 378 "1317\n"
 379 "1318\n"
 380 "1319\n"
 381 "1320\n"
 382 "1321\n"
 383 "1322\n"
 384 "1323\n"
 385 "1324\n"
 386 "1325\n"
 387 "1326\n"
 388 "1327\n"
 389 "1328\n"
 390 "1329\n"
 391 "1330\n"
 392 "1331\n"
 393 "1332\n"
 394 "1333\n"
 395 "1334\n"
 396 "1335\n"
 397 "1336\n"
 398 "1337\n"
 399 "1338\n"
 400 "1339\n"
 401 "1340\n"
 402 "1341\n"
 403 "1342\n"
 404 "1343\n"
 405 "1344\n"
 406 "1345\n"
 407 "1346\n"
 408 "1347\n"
 409 "1348\n"
 410 "1349\n"
 411 "1350\n"
 412 "1351\n"
 413 "1352\n"
 414 "1353\n"
 415 "1354\n"
 416 "1355\n"
 417 "1356\n"
 418 "1357\n"
 419 "1358\n"
 420 "1359\n"
 421 "1360\n"
 422 "1361\n"
 423 "1362\n"
 424 "1363\n"
 425 "1364\n"
 426 "1365\n"
 427 "1366\n"
 428 "1367\n"
 429 "1368\n"
 430 "1369\n"
 431 "1370\n"
 432 "1371\n"
 433 "1372\n"
 434 "1373\n"
 435 "1374\n"
 436 "1375\n"
 437 "1376\n"
 438 "1377\n"
 439 "1378\n"
 440 "1379\n"
 441 "1380\n"
 442 "1381\n"
 443 "1382\n"
 444 "1383\n"
 445 "1384\n"
 446 "1385\n"
 447 "1386\n"
 448 "1387\n"
 449 "1388\n"
 450 "1389\n"
 451 "1390\n"
 452 "1391\n"
 453 "1392\n"
 454 "1393\n"
 455 "1394\n"
 456 "1395\n"
 457 "1396\n"
 458 "1397\n"
 459 "1398\n"
 460 "1399\n"
 461 "1400\n"
 462 "1401\n"
 463 "1402\n"
 464 "1403\n"
 465 "1404\n"
 466 "1405\n"
 467 "1406\n"
 468 "1407\n"
 469 "1408\n"
 470 "1409\n"
 471 "1410\n"
 472 "1411\n"
 473 "1412\n"
 474 "1413\n"
 475 "1414\n"
 476 "1415\n"
 477 "1416\n"
 478 "1417\n"
 479 "1418\n"
 480 "1419\n"
 481 "1420\n"
 482 "1421\n"
 483 "1422\n"
 484 "1423\n"
 485 "1424\n"
 486 "1425\n"
 487 "1426\n"
 488 "1427\n"
 489 "1428\n"
 490 "1429\n"
 491 "1430\n"
 492 "1431\n"
 493 "1432\n"
 494 "1433\n"
 495 "1434\n"
 496 "1435\n"
 497 "1436\n"
 498 "1437\n"
 499 "1438\n"
 500 "1439\n"
 501 "1440\n"
 502 "1441\n"
 503 "1442\n"
 504 "1443\n"
 505 "1444\n"
 506 "1445\n"
 507 "1446\n"
 508 "1447\n"
 509 "1448\n"
 510 "1449\n"
 511 "1450\n"
 512 "1451\n"
 513 "1452\n"
 514 "1453\n"
 515 "1454\n"
 516 "1455\n"
 517 "1456\n"
 518 "1457\n"
 519 "1458\n"
 520 "1459\n"
 521 "1460\n"
 522 "1461\n"
 523 "1462\n"
 524 "1463\n"
 525 "1464\n"
 526 "1465\n"
 527 "1466\n"
 528 "1467\n"
 529 "1468\n"
 530 "1469\n"
 531 "1470\n"
 532 "1471\n"
 533 "1472\n"
 534 "1473\n"
 535 "1474\n"
 536 "1475\n"
 537 "1476\n"
 538 "1477\n"
 539 "1478\n"
 540 "1479\n"
 541 "1480\n"
 542 "1481\n"
 543 "1482\n"
 544 "1483\n"
 545 "1484\n"
 546 "1485\n"
 547 "1486\n"
 548 "1487\n"
 549 "1488\n"
 550 "1489\n"
 551 "1490\n"
 552 "1491\n"
 553 "1492\n"
 554 "1493\n"
 555 "1494\n"
 556 "1495\n"
 557 "1496\n"
 558 "1497\n"
 559 "1498\n"
 560 "1499\n"
 561 "1500\n"
 562 "1501\n"
 563 "1502\n"
 564 "1503\n"
 565 "1504\n"
 566 "1505\n"
 567 "1506\n"
 568 "1507\n"
 569 "1508\n"
 570 "1509\n"
 571 "1510\n"
 572 "1511\n"
 573 "1512\n"
 574 "1513\n"
 575 "1514\n"
 576 "1515\n"
 577 "1516\n"
 578 "1517\n"
 579 "1518\n"
 580 "1519\n"
 581 "1520\n"
 582 "1521\n"
 583 "1522\n"
 584 "1523\n"
 585 "1524\n"
 586 "1525\n"
 587 "1526\n"
 588 "1527\n"
 589 "1528\n"
 590 "1529\n"
 591 "1530\n"
 592 "1531\n"
 593 "1532\n"
 594 "1533\n"
 595 "1534\n"
 596 "1535\n"
 597 "1536\n"
 598 "1537\n"
 599 "1538\n"
 600 "1539\n"
 601 "1540\n"
 602 "1541\n"
 603 "1542\n"
 604 "1543\n"
 605 "1544\n"
 606 "1545\n"
 607 "1546\n"
 608 "1547\n"
 609 "1548\n"
 610 "1549\n"
 611 "1550\n"
 612 "1551\n"
 613 "1552\n"
 614 "1553\n"
 615 "1554\n"
 616 "1555\n"
 617 "1556\n"
 618 "1557\n"
 619 "1558\n"
 620 "1559\n"
 621 "1560\n"
 622 "1561\n"
 623 "1562\n"
 624 "1563\n"
 625 "1564\n"
 626 "1565\n"
 627 "1566\n"
 628 "1567\n"
 629 "1568\n"
 630 "1569\n"
 631 "1570\n"
 632 "1571\n"
 633 "1572\n"
 634 "1573\n"
 635 "1574\n"
 636 "1575\n"
 637 "1576\n"
 638 "1577\n"
 639 "1578\n"
 640 "1579\n"
 641 "1580\n"
 642 "1581\n"
 643 "1582\n"
 644 "1583\n"
 645 "1584\n"
 646 "1585\n"
 647 "1586\n"
 648 "1587\n"
 649 "1588\n"
 650 "1589\n"
 651 "1590\n"
 652 "1591\n"
 653 "1592\n"
 654 "1593\n"
 655 "1594\n"
 656 "1595\n"
 657 "1596\n"
 658 "1597\n"
 659 "1598\n"
 660 "1599\n"
 661 "1600\n"
 662 "1601\n"
 663 "1602\n"
 664 "1603\n"
 665 "1604\n"
 666 "1605\n"
 667 "1606\n"
 668 "1607\n"
 669 "1608\n"
 670 "1609\n"
 671 "1610\n"
 672 "1611\n"
 673 "1612\n"
 674 "1613\n"
 675 "1614\n"
 676 "1615\n"
 677 "1616\n"
 678 "1617\n"
 679 "1618\n"
 680 "1619\n"
 681 "1620\n"
 682 "1621\n"
 683 "1622\n"
 684 "1623\n"
 685 "1624\n"
 686 "1625\n"
 687 "1626\n"
 688 "1627\n"
 689 "1628\n"
 690 "1629\n"
 691 "1630\n"
 692 "1631\n"
 693 "1632\n"
 694 "1633\n"
 695 "1634\n"
 696 "1635\n"
 697 "1636\n"
 698 "1637\n"
 699 "1638\n"
 700 "1639\n"
 701 "1640\n"
 702 "1641\n"
 703 "1642\n"
 704 "1643\n"
 705 "1644\n"
 706 "1645\n"
 707 "1646\n"
 708 "1647\n"
 709 "1648\n"
 710 "1649\n"
 711 "1650\n"
 712 "1651\n"
 713 "1652\n"
 714 "1653\n"
 715 "1654\n"
 716 "1655\n"
 717 "1656\n"
 718 "1657\n"
 719 "1658\n"
 720 "1659\n"
 721 "1660\n"
 722 "1661\n"
 723 "1662\n"
 724 "1663\n"
 725 "1664\n"
 726 "1665\n"
 727 "1666\n"
 728 "1667\n"
 729 "1668\n"
 730 "1669\n"
 731 "1670\n"
 732 "1671\n"
 733 "1672\n"
 734 "1673\n"
 735 "1674\n"
 736 "1675\n"
 737 "1676\n"
 738 "1677\n"
 739 "1678\n"
 740 "1679\n"
 741 "1680\n"
 742 "1681\n"
 743 "1682\n"
 744 "1683\n"
 745 "1684\n"
 746 "1685\n"
 747 "1686\n"
 748 "1687\n"
 749 "1688\n"
 750 "1689\n"
 751 "1690\n"
 752 "1691\n"
 753 "1692\n"
 754 "1693\n"
 755 "1694\n"
 756 "1695\n"
 757 "1696\n"
 758 "1697\n"
 759 "1698\n"
 760 "1699\n"
 761 "1700\n"
 762 "1701\n"
 763 "1702\n"
 764 "1703\n"
 765 "1704\n"
 766 "1705\n"
 767 "1706\n"
 768 "1707\n"
 769 "1708\n"
 770 "1709\n"
 771 "1710\n"
 772 "1711\n"
 773 "1712\n"
 774 "1713\n"
 775 "1714\n"
 776 "1715\n"
 777 "1716\n"
 778 "1717\n"
 779 "1718\n"
 780 "1719\n"
 781 "1720\n"
 782 "1721\n"
 783 "1722\n"
 784 "1723\n"
 785 "1724\n"
 786 "1725\n"
 787 "1726\n"
 788 "1727\n"
 789 "1728\n"
 790 "1729\n"
 791 "1730\n"
 792 "1731\n"
 793 "1732\n"
 794 "1733\n"
 795 "1734\n"
 796 "1735\n"
 797 "1736\n"
 798 "1737\n"
 799 "1738\n"
 800 "1739\n"
 801 "1740\n"
 802 "1741\n"
 803 "1742\n"
 804 "1743\n"
 805 "1744\n"
 806 "1745\n"
 807 "1746\n"
 808 "1747\n"
 809 "1748\n"
 810 "1749\n"
 811 "1750\n"
 812 "1751\n"
 813 "1752\n"
 814 "1753\n"
 815 "1754\n"
 816 "1755\n"
 817 "1756\n"
 818 "1757\n"
 819 "1758\n"
 820 "1759\n"
 821 "1760\n"
 822 "1761\n"
 823 "1762\n"
 824 "1763\n"
 825 "1764\n"
 826 "1765\n"
 827 "1766\n"
 828 "1767\n"
 829 "1768\n"
 830 "1769\n"
 831 "1770\n"
 832 "1771\n"
 833 "1772\n"
 834 "1773\n"
 835 "1774\n"
 836 "1775\n"
 837 "1776\n"
 838 "1777\n"
 839 "1778\n"
 840 "1779\n"
 841 "1780\n"
 842 "1781\n"
 843 "1782\n"
 844 "1783\n"
 845 "1784\n"
 846 "1785\n"
 847 "1786\n"
 848 "1787\n"
 849 "1788\n"
 850 "1789\n"
 851 "1790\n"
 852 "1791\n"
 853 "1792\n"
 854 "1793\n"
 855 "1794\n"
 856 "1795\n"
 857 "1796\n"
 858 "1797\n"
 859 "1798\n"
 860 "1799\n"
 861 "1800\n"
 862 "1801\n"
 863 "1802\n"
 864 "1803\n"
 865 "1804\n"
 866 "1805\n"
 867 "1806\n"
 868 "1807\n"
 869 "1808\n"
 870 "1809\n"
 871 "1810\n"
 872 "1811\n"
 873 "1812\n"
 874 "1813\n"
 875 "1814\n"
 876 "1815\n"
 877 "1816\n"
 878 "1817\n"
 879 "1818\n"
 880 "1819\n"
 881 "1820\n"
 882 "1821\n"
 883 "1822\n"
 884 "1823\n"
 885 "1824\n"
 886 "1825\n"
 887 "1826\n";
 888
 889 /*
 890  * compare this file with read and mmap.
 891  * return 0 iff identical.
 892  */
 893
 894 static int
 895 compare_file (const char *filename)
 896 {
 897     struct stat sb;
 898     int fd;
 899     int ret;
 900     void *read_buf;
 901     void *mmap_buf;
 902
 903     fd = open (filename, O_RDONLY);
 904     if (fd < 0)
 905         err(1, "open %s", filename);
 906     ret = fstat (fd, &sb);
 907     if (ret < 0)
 908         err (1, "stat %s", filename);
 909     read_buf = malloc (sb.st_size);
 910     if (read_buf == NULL)
 911         err (1, "malloc %u", (unsigned)sb.st_size);
 912     ret = read (fd, read_buf, sb.st_size);
 913     if (ret < 0)
 914         err (1, "read %s", filename);
 915     if (ret != sb.st_size)
 916         errx (1, "short read from %s", filename);
 917     mmap_buf = mmap (NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
 918     if (mmap_buf == (void *)MAP_FAILED)
 919         err (1, "mmap %s", filename);
 920     ret = memcmp (read_buf, mmap_buf, sb.st_size);
 921     close (fd);
 922     free (read_buf);
 923     return ret;
 924 }
 925
 926 static void
 927 doit (const char *filename)
 928 {
 929     int fd;
 930     int ret;
 931
 932     fd = open (filename, O_WRONLY | O_APPEND | O_CREAT | O_TRUNC, 0600);
 933     if (fd < 0)
 934         err (1, "open %s", filename);
 935     ret = close (fd);
 936     if (ret < 0)
 937         err (1, "close %s", filename);
 938     fd = open (filename, O_WRONLY | O_APPEND);
 939     if (fd < 0)
 940         err (1, "open %s", filename);
 941     ret = write (fd, "foobar\n", 7);
 942     if (ret < 0)
 943         err (1, "write %s", filename);
 944     if (ret != 7)
 945         errx (1, "short write to %s", filename);
 946     ret = close (fd);
 947     if (ret < 0)
 948         err(1, "close %s", filename);
 949
 950     if(compare_file (filename))
 951         errx (1, "compare 1 failed");
 952
 953     fd = open (filename, O_WRONLY | O_APPEND);
 954     if (fd < 0)
 955         err (1, "open %s", filename);
 956     ret = write (fd, long_buf, strlen(long_buf));
 957     if (ret < 0)
 958         err (1, "write %s", filename);
 959     if (ret != strlen(long_buf))
 960         errx (1, "short write to %s", filename);
 961     ret = close (fd);
 962     if (ret < 0)
 963         err(1, "close %s", filename);
 964
 965     if(compare_file (filename))
 966         errx (1, "compare 2 failed");
 967 }
 968
 969 int
 970 main(int argc, char **argv)
 971 {
 972     const char *file = "blaha";
 973
 974     setprogname (argv[0]);
 975     if (argc != 1 && argc != 2)
 976         errx (1, "usage: %s [file]", argv[0]);
 977     if (argc == 2)
 978         file = argv[1];
 979     doit (file);
 980     return 0;
 981 }