1 /*
2 *
3 * Copyright (c) International Business Machines Corp., 2001
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20 /*
21 * NAME
22 * fcntl11.c
23 *
24 * DESCRIPTION
25 * Testcase to check locking of regions of a file
26 *
27 * ALGORITHM
28 * Test changing lock sections around a write lock
29 *
30 * USAGE
31 * fcntl11
32 *
33 * HISTORY
34 * 07/2001 Ported by Wayne Boyer
35 *
36 * RESTRICTIONS
37 * None
38 */
39
40 #include <fcntl.h>
41 #include <errno.h>
42 #include <signal.h>
43 #include <sys/types.h>
44 #include <sys/stat.h>
45 #include <sys/wait.h>
46 #include <inttypes.h>
47 #include "test.h"
48 #include "safe_macros.h"
49
50 #define STRINGSIZE 27
51 #define STRING "abcdefghijklmnopqrstuvwxyz\n"
52 #define STOP 0xFFF0
53
54 int parent_pipe[2];
55 int child_pipe[2];
56 int fd;
57 pid_t parent_pid, child_pid;
58
59 void parent_put();
60 void parent_get();
61 void child_put();
62 void child_get();
63 void stop_child();
64 void compare_lock(struct flock *, short, short, int, int, pid_t);
65 void unlock_file();
66 void do_test(struct flock *, short, short, int, int);
67 void catch_child();
68 char *str_type();
69 int do_lock(int, short, short, int, int);
70
71 char *TCID = "fcntl11";
72 int TST_TOTAL = 1;
73
74 int fail;
75
cleanup(void)76 void cleanup(void)
77 {
78 tst_rmdir();
79
80 }
81
setup(void)82 void setup(void)
83 {
84 char *buf = STRING;
85 char template[PATH_MAX];
86 struct sigaction act;
87
88 tst_sig(FORK, DEF_HANDLER, cleanup);
89 tst_tmpdir();
90
91 umask(0);
92
93 TEST_PAUSE;
94
95 SAFE_PIPE(cleanup, parent_pipe);
96 SAFE_PIPE(cleanup, child_pipe);
97 parent_pid = getpid();
98 snprintf(template, PATH_MAX, "fcntl11XXXXXX");
99
100 if ((fd = mkstemp(template)) < 0)
101 tst_resm(TFAIL, "Couldn't open temp file! errno = %d", errno);
102
103 SAFE_WRITE(cleanup, SAFE_WRITE_ANY, fd, buf, STRINGSIZE);
104
105 memset(&act, 0, sizeof(act));
106 act.sa_handler = catch_child;
107 sigemptyset(&act.sa_mask);
108 sigaddset(&act.sa_mask, SIGCHLD);
109 if ((sigaction(SIGCHLD, &act, NULL)) < 0)
110 tst_brkm(TBROK | TERRNO, cleanup,
111 "sigaction(SIGCHLD, ..) failed");
112 }
113
do_child(void)114 void do_child(void)
115 {
116 struct flock fl;
117
118 close(parent_pipe[1]);
119 close(child_pipe[0]);
120 while (1) {
121 child_get(&fl);
122 if (fcntl(fd, F_GETLK, &fl) < 0)
123 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
124 child_put(&fl);
125 }
126 }
127
do_lock(int cmd,short type,short whence,int start,int len)128 int do_lock(int cmd, short type, short whence, int start, int len)
129 {
130 struct flock fl;
131
132 fl.l_type = type;
133 fl.l_whence = whence;
134 fl.l_start = start;
135 fl.l_len = len;
136 return (fcntl(fd, cmd, &fl));
137 }
138
do_test(struct flock * fl,short type,short whence,int start,int len)139 void do_test(struct flock *fl, short type, short whence, int start, int len)
140 {
141 fl->l_type = type;
142 fl->l_whence = whence;
143 fl->l_start = start;
144 fl->l_len = len;
145 fl->l_pid = (short)0;
146
147 parent_put(fl);
148 parent_get(fl);
149 }
150
151 void
compare_lock(struct flock * fl,short type,short whence,int start,int len,pid_t pid)152 compare_lock(struct flock *fl, short type, short whence, int start, int len,
153 pid_t pid)
154 {
155 if (fl->l_type != type)
156 tst_resm(TFAIL, "lock type is wrong should be %s is %s",
157 str_type(type), str_type(fl->l_type));
158
159 if (fl->l_whence != whence)
160 tst_resm(TFAIL, "lock whence is wrong should be %d is %d",
161 whence, fl->l_whence);
162
163 if (fl->l_start != start)
164 tst_resm(TFAIL, "region starts in wrong place, should be "
165 "%d is %" PRId64, start, (int64_t) fl->l_start);
166
167 if (fl->l_len != len)
168 tst_resm(TFAIL,
169 "region length is wrong, should be %d is %" PRId64,
170 len, (int64_t) fl->l_len);
171
172 if (fl->l_pid != pid)
173 tst_resm(TFAIL, "locking pid is wrong, should be %d is %d",
174 pid, fl->l_pid);
175 }
176
unlock_file(void)177 void unlock_file(void)
178 {
179 struct flock fl;
180
181 if (do_lock(F_SETLK, (short)F_UNLCK, (short)0, 0, 0) < 0)
182 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
183 do_test(&fl, F_WRLCK, 0, 0, 0);
184 compare_lock(&fl, (short)F_UNLCK, (short)0, 0, 0, (pid_t) 0);
185 }
186
str_type(int type)187 char *str_type(int type)
188 {
189 static char buf[20];
190
191 switch (type) {
192 case F_RDLCK:
193 return ("F_RDLCK");
194 case F_WRLCK:
195 return ("F_WRLCK");
196 case F_UNLCK:
197 return ("F_UNLCK");
198 default:
199 sprintf(buf, "BAD VALUE: %d", type);
200 return (buf);
201 }
202 }
203
parent_put(struct flock * l)204 void parent_put(struct flock *l)
205 {
206 SAFE_WRITE(cleanup, SAFE_WRITE_ALL, parent_pipe[1], l, sizeof(*l));
207 }
208
parent_get(struct flock * l)209 void parent_get(struct flock *l)
210 {
211 SAFE_READ(cleanup, 1, child_pipe[0], l, sizeof(*l));
212 }
213
child_put(struct flock * l)214 void child_put(struct flock *l)
215 {
216 SAFE_WRITE(NULL, SAFE_WRITE_ALL, child_pipe[1], l, sizeof(*l));
217 }
218
child_get(struct flock * l)219 void child_get(struct flock *l)
220 {
221 SAFE_READ(NULL, 1, parent_pipe[0], l, sizeof(*l));
222 if (l->l_type == (short)STOP)
223 exit(0);
224 }
225
stop_child(void)226 void stop_child(void)
227 {
228 struct flock fl;
229
230 signal(SIGCHLD, SIG_DFL);
231 fl.l_type = STOP;
232 parent_put(&fl);
233 wait(0);
234 }
235
catch_child(void)236 void catch_child(void)
237 {
238 tst_brkm(TFAIL, cleanup, "Unexpected death of child process");
239 }
240
main(int ac,char ** av)241 int main(int ac, char **av)
242 {
243 struct flock tl;
244
245 int lc;
246
247 tst_parse_opts(ac, av, NULL, NULL);
248
249 setup(); /* global setup */
250
251 /* Check for looping state if -i option is given */
252 for (lc = 0; TEST_LOOPING(lc); lc++) {
253 /* reset tst_count in case we are looping */
254 tst_count = 0;
255
256 if ((child_pid = tst_fork()) == 0) /* parent */
257 do_child();
258 else if (child_pid == -1)
259 tst_brkm(TBROK | TERRNO, cleanup, "fork failed");
260
261 SAFE_CLOSE(cleanup, parent_pipe[0]);
262 SAFE_CLOSE(cleanup, child_pipe[1]);
263
264 /* //block1: */
265 tst_resm(TINFO, "Enter block 1");
266
267 /*
268 * Add a write lock to the middle of the file and a read
269 * at the begining
270 */
271 if (do_lock(F_SETLK, (short)F_WRLCK, (short)0, 10, 5) < 0)
272 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
273
274 if (do_lock(F_SETLK, (short)F_RDLCK, (short)0, 1, 5) < 0)
275 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
276
277 /*
278 * Test read lock
279 */
280 do_test(&tl, F_WRLCK, 0, 0, 0);
281 compare_lock(&tl, (short)F_RDLCK, (short)0, 1, 5, parent_pid);
282
283 /*
284 * Test write lock
285 */
286 do_test(&tl, F_WRLCK, 0, 6, 0);
287 compare_lock(&tl, (short)F_WRLCK, (short)0, 10, 5, parent_pid);
288
289 /*
290 * Test that the rest of the file is unlocked
291 */
292 do_test(&tl, F_WRLCK, 0, 15, 0);
293 compare_lock(&tl, (short)F_UNLCK, (short)0, 15, 0, 0);
294
295 /*
296 * remove all the locks set above
297 */
298 unlock_file();
299
300 tst_resm(TINFO, "Exit block 1");
301
302 /* //block2: */
303 tst_resm(TINFO, "Enter block 2");
304
305 /*
306 * Set a write lock at the middle of the file and a
307 * read lock just before
308 */
309 if (do_lock(F_SETLK, (short)F_WRLCK, (short)0, 10, 5) < 0)
310 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
311
312 if (do_lock(F_SETLK, (short)F_RDLCK, (short)0, 5, 5) < 0)
313 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
314
315 /*
316 * Test the read lock
317 */
318 do_test(&tl, (short)F_WRLCK, (short)0, 0, 0);
319 compare_lock(&tl, (short)F_RDLCK, (short)0, 5, 5, parent_pid);
320
321 /*
322 * Test the write lock.
323 */
324 do_test(&tl, (short)F_WRLCK, (short)0, 10, 0);
325 compare_lock(&tl, (short)F_WRLCK, (short)0, 10, 5, parent_pid);
326
327 /*
328 * Test to make sure the rest of the file is unlocked.
329 */
330 do_test(&tl, (short)F_WRLCK, (short)0, 15, 0);
331 compare_lock(&tl, (short)F_UNLCK, (short)0, 15, 0, 0);
332
333 /*
334 * remove all the locks set above
335 */
336 unlock_file();
337
338 tst_resm(TINFO, "Exit block 2");
339
340 /* //block3: */
341 tst_resm(TINFO, "Enter block 3");
342
343 /*
344 * Set a write lock in the middle and a read lock that
345 * ends at the first byte of the write lock
346 */
347 if (do_lock(F_SETLK, (short)F_WRLCK, (short)0, 10, 5) < 0)
348 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
349
350 if (do_lock(F_SETLK, (short)F_RDLCK, (short)0, 5, 6) < 0)
351 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
352
353 /*
354 * Test read lock
355 */
356 do_test(&tl, (short)F_WRLCK, (short)0, 0, 0);
357 compare_lock(&tl, (short)F_RDLCK, (short)0, 5, 6, parent_pid);
358
359 /*
360 * Test write lock
361 */
362 do_test(&tl, (short)F_WRLCK, (short)0, 11, 0);
363 compare_lock(&tl, (short)F_WRLCK, (short)0, 11, 4, parent_pid);
364
365 /*
366 * Test to make sure the rest of the file is unlocked.
367 */
368 do_test(&tl, (short)F_WRLCK, (short)0, 15, 0);
369 compare_lock(&tl, (short)F_UNLCK, (short)0, 15, 0, 0);
370
371 /*
372 * remove all the locks set above
373 */
374 unlock_file();
375
376 tst_resm(TINFO, "Exit block 3");
377
378 /* //block4: */
379 tst_resm(TINFO, "Enter block 4");
380
381 /*
382 * Set a write lock on the middle of the file and a read
383 * lock that overlaps the front of the write.
384 */
385 if (do_lock(F_SETLK, (short)F_WRLCK, (short)0, 10, 5) < 0)
386 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
387
388 if (do_lock(F_SETLK, (short)F_RDLCK, (short)0, 5, 8) < 0)
389 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
390
391 /*
392 * Test the read lock
393 */
394 do_test(&tl, (short)F_WRLCK, (short)0, 5, 0);
395 compare_lock(&tl, (short)F_RDLCK, (short)0, 5, 8, parent_pid);
396
397 /*
398 * Test the write lock
399 */
400 do_test(&tl, (short)F_WRLCK, (short)0, 13, 0);
401 compare_lock(&tl, (short)F_WRLCK, (short)0, 13, 2, parent_pid);
402
403 /*
404 * Test to make sure the rest of the file is unlocked.
405 */
406 do_test(&tl, (short)F_WRLCK, (short)0, 15, 0);
407 compare_lock(&tl, (short)F_UNLCK, (short)0, 15, 0, 0);
408
409 /*
410 * remove all the locks set above
411 */
412 unlock_file();
413
414 tst_resm(TINFO, "Exit block 4");
415
416 /* //block5: */
417 tst_resm(TINFO, "Enter block 5");
418
419 /*
420 * Set a write lock in the middle of a file and a read
421 * lock in the middle of it
422 */
423 if (do_lock(F_SETLK, (short)F_WRLCK, (short)0, 10, 10) < 0)
424 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
425
426 if (do_lock(F_SETLK, (short)F_RDLCK, (short)0, 13, 5) < 0)
427 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
428
429 /*
430 * Test the first write lock
431 */
432 do_test(&tl, (short)F_WRLCK, (short)0, 0, 0);
433 compare_lock(&tl, (short)F_WRLCK, (short)0, 10, 3, parent_pid);
434
435 /*
436 * Test the read lock
437 */
438 do_test(&tl, (short)F_WRLCK, (short)0, 13, 0);
439 compare_lock(&tl, (short)F_RDLCK, (short)0, 13, 5, parent_pid);
440
441 /*
442 * Test the second write lock
443 */
444 do_test(&tl, (short)F_WRLCK, (short)0, 18, 0);
445 compare_lock(&tl, (short)F_WRLCK, (short)0, 18, 2, parent_pid);
446
447 /*
448 * Test to make sure the rest of the file is unlocked
449 */
450 do_test(&tl, (short)F_WRLCK, (short)0, 20, 0);
451 compare_lock(&tl, (short)F_UNLCK, (short)0, 20, 0, 0);
452
453 /*
454 * remove all the locks set above.
455 */
456 unlock_file();
457 tst_resm(TINFO, "Exit block 5");
458
459 /* //block6: */
460 tst_resm(TINFO, "Enter block 6");
461 /*
462 * Set a write lock in the middle of the file and a read
463 * lock that overlaps the end
464 */
465 if (do_lock(F_SETLK, (short)F_WRLCK, (short)0, 10, 5) < 0)
466 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
467
468 /*
469 * Set a read lock on the whole file
470 */
471 if (do_lock(F_SETLK, (short)F_RDLCK, (short)0, 13, 5) < 0)
472 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
473
474 /*
475 * Test the write lock
476 */
477 do_test(&tl, (short)F_WRLCK, (short)0, 0, 0);
478 compare_lock(&tl, (short)F_WRLCK, (short)0, 10, 3, parent_pid);
479
480 /*
481 * Test the read lock
482 */
483 do_test(&tl, (short)F_WRLCK, (short)0, 13, 0);
484 compare_lock(&tl, (short)F_RDLCK, (short)0, 13, 5, parent_pid);
485
486 /*
487 * Test to make sure the rest of the file is unlocked
488 */
489 do_test(&tl, (short)F_WRLCK, (short)0, 18, 0);
490 compare_lock(&tl, (short)F_UNLCK, (short)0, 18, 0, 0);
491
492 /*
493 * remove all the locks set above
494 */
495 unlock_file();
496
497 tst_resm(TINFO, "Exit block 6");
498
499 /* //block7: */
500 tst_resm(TINFO, "Enter block 7");
501
502 /*
503 * Set a write lock in the middle of the file and a read
504 * lock starting at the last byte of the write lock
505 */
506 if (do_lock(F_SETLK, (short)F_WRLCK, (short)0, 10, 5) < 0)
507 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
508
509 /*
510 * Set a read lock on the whole file.
511 */
512 if (do_lock(F_SETLK, (short)F_RDLCK, (short)0, 14, 5) < 0)
513 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
514
515 /*
516 * Test write lock
517 */
518 do_test(&tl, (short)F_WRLCK, (short)0, 0, 0);
519 compare_lock(&tl, (short)F_WRLCK, (short)0, 10, 4, parent_pid);
520
521 /*
522 * Test the read lock
523 */
524 do_test(&tl, (short)F_WRLCK, (short)0, 14, 0);
525 compare_lock(&tl, (short)F_RDLCK, (short)0, 14, 5, parent_pid);
526
527 /*
528 * Test to make sure the end of the file is unlocked
529 */
530 do_test(&tl, (short)F_WRLCK, (short)0, 19, 0);
531 compare_lock(&tl, (short)F_UNLCK, (short)0, 19, 0, 0);
532
533 /*
534 * remove all the locks set above
535 */
536 unlock_file();
537
538 tst_resm(TINFO, "Exit block 7");
539
540 /* //block8: */
541 tst_resm(TINFO, "Enter block 8");
542
543 /*
544 * Set a write lock in the middle of the file and a read
545 * lock that starts just after the last byte of the
546 * write lock.
547 */
548 if (do_lock(F_SETLK, (short)F_WRLCK, (short)0, 10, 5) < 0)
549 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
550
551 /*
552 * Set a read lock on the whole file
553 */
554 if (do_lock(F_SETLK, (short)F_RDLCK, (short)0, 15, 5) < 0)
555 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
556
557 /*
558 * Test the write lock
559 */
560 do_test(&tl, (short)F_WRLCK, (short)0, 0, 0);
561 compare_lock(&tl, (short)F_WRLCK, (short)0, 10, 5, parent_pid);
562
563 /*
564 * Test the read lock
565 */
566 do_test(&tl, (short)F_WRLCK, (short)0, 15, 0);
567 compare_lock(&tl, (short)F_RDLCK, (short)0, 15, 5, parent_pid);
568
569 /*
570 * Test to make sure the rest of the file is unlocked
571 */
572 do_test(&tl, (short)F_WRLCK, (short)0, 20, 0);
573 compare_lock(&tl, (short)F_UNLCK, (short)0, 20, 0, 0);
574
575 /*
576 * remove all the locks set above
577 */
578 unlock_file();
579
580 tst_resm(TINFO, "Exit block 8");
581
582 /* //block9: */
583 tst_resm(TINFO, "Enter block 9");
584
585 /*
586 * Set a write lock at the middle of the file and a read
587 * lock that starts past the end of the write lock.
588 */
589 if (do_lock(F_SETLK, (short)F_WRLCK, (short)0, 10, 5) < 0)
590 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
591
592 if (do_lock(F_SETLK, (short)F_RDLCK, (short)0, 16, 5) < 0)
593 tst_resm(TFAIL | TERRNO, "fcntl on file failed");
594
595 /*
596 * Test the write lock
597 */
598 do_test(&tl, (short)F_WRLCK, (short)0, 0, 0);
599 compare_lock(&tl, (short)F_WRLCK, (short)0, 10, 5, parent_pid);
600
601 /*
602 * Test that byte in between is unlocked
603 */
604 do_test(&tl, (short)F_WRLCK, (short)0, 15, 1);
605 compare_lock(&tl, (short)F_UNLCK, (short)0, 15, 1, 0);
606
607 /*
608 * Test the read lock
609 */
610 do_test(&tl, (short)F_WRLCK, (short)0, 16, 0);
611 compare_lock(&tl, (short)F_RDLCK, (short)0, 16, 5, parent_pid);
612
613 /*
614 * Test to make sure the rest of the file is unlocked
615 */
616 do_test(&tl, (short)F_WRLCK, (short)0, 21, 0);
617 compare_lock(&tl, (short)F_UNLCK, (short)0, 21, 0, 0);
618
619 /*
620 * remove all the locks set above
621 */
622 unlock_file();
623
624 tst_resm(TINFO, "Exit block 9");
625
626 stop_child();
627 SAFE_CLOSE(cleanup, fd);
628 }
629 cleanup();
630 tst_exit();
631 }
632