1 /* IBM Corporation */
2 /* 01/02/2003 Port to LTP avenkat@us.ibm.com */
3 /* 06/30/2001 Port to Linux nsharoff@us.ibm.com */
4 /*
5 * Copyright (c) International Business Machines Corp., 2003
6 *
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
16 * the GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #define _GNU_SOURCE 1
24 #include <stdio.h>
25 #include <fcntl.h>
26 #include <signal.h>
27 #include <sys/mman.h>
28 #include <sys/wait.h>
29 #include <sys/stat.h>
30 #include <unistd.h>
31 #include <stdlib.h>
32 #include <errno.h>
33 #include <sys/types.h>
34 #include <limits.h>
35 /***** LTP Port *****/
36 #include "test.h"
37 #define FAILED 0
38 #define PASSED 1
39
40 int local_flag = PASSED;
41 char *TCID = "mmapstress01"; //tmnoextend
42 FILE *temp;
43 int TST_TOTAL = 1;
44
45 int anyfail();
46 void ok_exit();
47 /***** ** ** *****/
48
49 /*
50 * This test stresses mmaps, without dealing with fragments or anything!
51 * It forks a specified number of children,
52 * all of whom mmap the same file, make a given number of accesses
53 * to random pages in the map (reading & writing and comparing data).
54 * Then the child exits and the parent forks another to take its place.
55 * Each time a child is forked, it stats the file and maps the full
56 * length of the file.
57 *
58 * This program continues to run until it either receives a SIGINT,
59 * or times out (if a timeout value is specified). When either of
60 * these things happens, it cleans up its kids, then checks the
61 * file to make sure it has the correct data.
62 *
63 * usage:
64 * tmnoextend -p nprocs [-t minutes -f filesize -S sparseoffset
65 * -r -o -m -l -d]
66 * where:
67 * -p nprocs - specifies the number of mapping children
68 * to create. (nprocs + 1 children actually
69 * get created, since one is the writer child)
70 * -t minutes - specifies minutes to run. If not specified,
71 * default is to run forever until a SIGINT
72 * is received.
73 * -f filesize - initial filesize (defaults to FILESIZE)
74 * -S sparseoffset - when non-zero, causes a sparse area to
75 * be left before the data, meaning that the
76 * actual initial file size is sparseoffset +
77 * filesize. Useful for testing large files.
78 * (default is 0).
79 * -r - randomize number of pages map children check.
80 * (random % MAXLOOPS). If not specified, each
81 * child checks MAXLOOPS pages.
82 * -o - randomize offset of file to map. (default is 0)
83 * -m - do random msync/fsyncs as well
84 * -l - if set, the output file is not removed on
85 * program exit.
86 * -d - enable debug output
87 *
88 * Compile with -DLARGE_FILE to enable file sizes > 2 GB.
89 */
90
91 #define MAXLOOPS 500 /* max pages for map children to write */
92 #define FILESIZE 4096 /* initial filesize set up by parent */
93
94 #ifdef roundup
95 #undef roundup
96 #endif
97 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
98 #define min(x, y) (((x) < (y)) ? (x) : (y))
99
100 extern time_t time(time_t *);
101 extern char *ctime(const time_t *);
102 extern void *malloc(size_t);
103 extern long lrand48(void);
104 extern void srand(unsigned);
105 extern void srand48(long);
106 extern int rand(void);
107 extern int atoi(const char *);
108
109 char *usage =
110 "-p nprocs [-t minutes -f filesize -S sparseoffset -r -o -m -l -d]";
111
112 typedef unsigned char uchar_t;
113 #define SIZE_MAX UINT_MAX
114
115 unsigned int initrand(void);
116 void finish(int sig);
117 void child_mapper(char *file, unsigned procno, unsigned nprocs);
118 int fileokay(char *file, uchar_t * expbuf);
119 int finished = 0;
120 int leavefile = 0;
121
122 int debug = 0;
123 #ifdef LARGE_FILE
124 off64_t filesize = FILESIZE;
125 off64_t sparseoffset = 0;
126 #else /* LARGE_FILE */
127 off_t filesize = FILESIZE;
128 off_t sparseoffset = 0;
129 #endif /* LARGE_FILE */
130 unsigned randloops = 0;
131 unsigned dosync = 0;
132 unsigned do_offset = 0;
133 unsigned pattern = 0;
134
main(int argc,char * argv[])135 int main(int argc, char *argv[])
136 {
137 char *progname;
138 int fd;
139 int c;
140 extern char *optarg;
141 unsigned nprocs = 0;
142 unsigned procno;
143 pid_t *pidarray = NULL;
144 pid_t pid;
145 uchar_t *buf = NULL;
146 unsigned int seed;
147 int pagesize = sysconf(_SC_PAGE_SIZE);
148 float alarmtime = 0;
149 struct sigaction sa;
150 unsigned i;
151 int write_cnt;
152 uchar_t data;
153 int no_prob = 0;
154 int wait_stat;
155 time_t t;
156 #ifdef LARGE_FILE
157 off64_t bytes_left;
158 #else /* LARGE_FILE */
159 off_t bytes_left;
160 #endif /* LARGE_FILE */
161 const char *filename = "mmapstress01.out";
162
163 progname = *argv;
164 tst_tmpdir();
165 if (argc < 2) {
166 tst_brkm(TBROK, NULL, "usage: %s %s\n", progname, usage);
167 }
168
169 while ((c = getopt(argc, argv, "S:omdlrf:p:t:")) != -1) {
170 switch (c) {
171 case 'd':
172 debug = 1;
173 break;
174 case 't':
175 alarmtime = atof(optarg) * 60;
176 break;
177 case 'p':
178 nprocs = atoi(optarg);
179 break;
180 case 'l':
181 leavefile = 1;
182 break;
183 case 'f':
184 #ifdef LARGE_FILE
185 filesize = atoll(optarg);
186 #else /* LARGE_FILE */
187 filesize = atoi(optarg);
188 #endif /* LARGE_FILE */
189 if (filesize < 0) {
190 (void)fprintf(stderr, "error: negative "
191 "filesize\n");
192 anyfail();
193 }
194 break;
195 case 'r':
196 randloops = 1;
197 break;
198 case 'm':
199 dosync = 1;
200 break;
201 case 'o':
202 do_offset = 1;
203 break;
204 case 'S':
205 #ifdef LARGE_FILE
206 sparseoffset = atoll(optarg);
207 #else /* LARGE_FILE */
208 sparseoffset = atoi(optarg);
209 #endif /* LARGE_FILE */
210 if (sparseoffset % pagesize != 0) {
211 fprintf(stderr,
212 "sparseoffset must be pagesize multiple\n");
213 anyfail();
214 }
215 break;
216 default:
217 (void)fprintf(stderr, "usage: %s %s\n", progname,
218 usage);
219 tst_exit();
220 }
221 }
222
223 /* nprocs is >= 0 since it's unsigned */
224 if (nprocs > 255) {
225 (void)fprintf(stderr, "invalid nprocs %d - (range 0-255)\n",
226 nprocs);
227 anyfail();
228 }
229
230 (void)time(&t);
231
232 seed = initrand();
233 pattern = seed & 0xff;
234
235 if (debug) {
236 #ifdef LARGE_FILE
237 (void)printf("creating file <%s> with %Ld bytes, pattern %d\n",
238 filename, filesize, pattern);
239 #else /* LARGE_FILE */
240 (void)printf("creating file <%s> with %ld bytes, pattern %d\n",
241 filename, filesize, pattern);
242 #endif /* LARGE_FILE */
243 if (alarmtime)
244 (void)printf("running for %f minutes\n",
245 alarmtime / 60);
246 else
247 (void)printf("running with no time limit\n");
248 }
249
250 /*
251 * Plan for death by signal. User may have specified
252 * a time limit, in which set an alarm and catch SIGALRM.
253 * Also catch and cleanup with SIGINT.
254 */
255 sa.sa_handler = finish;
256 sa.sa_flags = 0;
257 if (sigemptyset(&sa.sa_mask)) {
258 perror("sigemptyset error");
259 goto cleanup;
260 }
261
262 if (sigaction(SIGINT, &sa, 0) == -1) {
263 perror("sigaction error SIGINT");
264 goto cleanup;
265 }
266 if (sigaction(SIGQUIT, &sa, 0) == -1) {
267 perror("sigaction error SIGQUIT");
268 goto cleanup;
269 }
270 if (sigaction(SIGTERM, &sa, 0) == -1) {
271 perror("sigaction error SIGTERM");
272 goto cleanup;
273 }
274
275 if (alarmtime) {
276 if (sigaction(SIGALRM, &sa, 0) == -1) {
277 perror("sigaction error");
278 goto cleanup;
279 }
280 (void)alarm(alarmtime);
281 }
282 #ifdef LARGE_FILE
283 if ((fd = open64(filename, O_CREAT | O_TRUNC | O_RDWR, 0664)) == -1) {
284 #else /* LARGE_FILE */
285 if ((fd = open(filename, O_CREAT | O_TRUNC | O_RDWR, 0664)) == -1) {
286 #endif /* LARGE_FILE */
287 perror("open error");
288 anyfail();
289 }
290
291 if ((buf = malloc(pagesize)) == NULL
292 || (pidarray = malloc(nprocs * sizeof(pid_t))) == NULL) {
293 perror("malloc error");
294 anyfail();
295 }
296
297 for (i = 0; i < nprocs; i++)
298 *(pidarray + i) = 0;
299
300 for (i = 0, data = 0; i < pagesize; i++) {
301 *(buf + i) = (data + pattern) & 0xff;
302 if (++data == nprocs)
303 data = 0;
304 }
305 #ifdef LARGE_FILE
306 if (lseek64(fd, sparseoffset, SEEK_SET) < 0) {
307 #else /* LARGE_FILE */
308 if (lseek(fd, sparseoffset, SEEK_SET) < 0) {
309 #endif /* LARGE_FILE */
310 perror("lseek");
311 anyfail();
312 }
313 for (bytes_left = filesize; bytes_left; bytes_left -= c) {
314 write_cnt = min(pagesize, bytes_left);
315 if ((c = write(fd, buf, write_cnt)) != write_cnt) {
316 if (c == -1) {
317 perror("write error");
318 } else {
319 (void)fprintf(stderr, "write: wrote %d of %d "
320 "bytes\n", c, write_cnt);
321 }
322 (void)close(fd);
323 (void)unlink(filename);
324 anyfail();
325 }
326 }
327
328 (void)close(fd);
329
330 /*
331 * Fork off mmap children.
332 */
333 for (procno = 0; procno < nprocs; procno++) {
334 switch (pid = fork()) {
335
336 case -1:
337 perror("fork error");
338 goto cleanup;
339
340 case 0:
341 child_mapper(filename, procno, nprocs);
342 exit(0);
343
344 default:
345 pidarray[procno] = pid;
346 }
347 }
348
349 /*
350 * Now wait for children and refork them as needed.
351 */
352
353 while (!finished) {
354 pid = wait(&wait_stat);
355 /*
356 * Block signals while processing child exit.
357 */
358
359 if (sighold(SIGALRM) || sighold(SIGINT)) {
360 perror("sighold error");
361 goto cleanup;
362 }
363
364 if (pid != -1) {
365 /*
366 * Check exit status, then refork with the
367 * appropriate procno.
368 */
369 if (!WIFEXITED(wait_stat)
370 || WEXITSTATUS(wait_stat) != 0) {
371 (void)fprintf(stderr, "child exit with err "
372 "<x%x>\n", wait_stat);
373 goto cleanup;
374 }
375 for (i = 0; i < nprocs; i++)
376 if (pid == pidarray[i])
377 break;
378 if (i == nprocs) {
379 (void)fprintf(stderr, "unknown child pid %d, "
380 "<x%x>\n", pid, wait_stat);
381 goto cleanup;
382 }
383
384 if ((pid = fork()) == -1) {
385 perror("fork error");
386 pidarray[i] = 0;
387 goto cleanup;
388 } else if (pid == 0) { /* child */
389 child_mapper(filename, i, nprocs);
390 exit(0);
391 } else
392 pidarray[i] = pid;
393 } else {
394 /*
395 * wait returned an error. If EINTR, then
396 * normal finish, else it's an unexpected
397 * error...
398 */
399 if (errno != EINTR || !finished) {
400 perror("unexpected wait error");
401 goto cleanup;
402 }
403 }
404 if (sigrelse(SIGALRM) || sigrelse(SIGINT)) {
405 perror("sigrelse error");
406 goto cleanup;
407 }
408 }
409
410 /*
411 * Finished! Check the file for sanity, then kill all
412 * the children and done!.
413 */
414
415 if (sighold(SIGALRM)) {
416 perror("sighold error");
417 goto cleanup;
418 }
419 (void)alarm(0);
420 no_prob = 1;
421
422 cleanup:
423 for (i = 0; i < nprocs; i++)
424 (void)kill(pidarray[i], SIGKILL);
425
426 while (wait(&wait_stat) != -1 || errno != ECHILD)
427 continue;
428
429 if (no_prob) { /* only check file if no errors */
430 if (!fileokay(filename, buf)) {
431 (void)fprintf(stderr, "file data incorrect!\n");
432 (void)printf(" leaving file <%s>\n", filename);
433 /***** LTP Port *****/
434 local_flag = FAILED;
435 anyfail();
436 /***** ** *****/
437 } else {
438 (void)printf("file data okay\n");
439 if (!leavefile)
440 (void)unlink(filename);
441 }
442 } else
443 (void)printf(" leaving file <%s>\n", filename);
444
445 (void)time(&t);
446 //(void)printf("%s: Finished %s", argv[0], ctime(&t)); LTP Port
447 ok_exit();
448 tst_exit();
449 }
450
451 /*
452 * Child process that reads/writes map. The child stats the file
453 * to determine the size, maps the size of the file, then reads/writes
454 * its own locations on random pages of the map (its locations being
455 * determined based on nprocs & procno). After a specific number of
456 * iterations, it exits.
457 */
458 void child_mapper(char *file, unsigned procno, unsigned nprocs)
459 {
460 #ifdef LARGE_FILE
461 struct stat64 statbuf;
462 off64_t filesize;
463 off64_t offset;
464 #else /* LARGE_FILE */
465 struct stat statbuf;
466 off_t filesize;
467 off_t offset;
468 #endif /* LARGE_FILE */
469 size_t validsize;
470 size_t mapsize;
471 char *maddr = NULL, *paddr;
472 int fd;
473 size_t pagesize = sysconf(_SC_PAGE_SIZE);
474 unsigned randpage;
475 unsigned int seed;
476 unsigned loopcnt;
477 unsigned nloops;
478 unsigned mappages;
479 unsigned i;
480
481 seed = initrand(); /* initialize random seed */
482
483 #ifdef LARGE_FILE
484 if (stat64(file, &statbuf) == -1) {
485 #else /* LARGE_FILE */
486 if (stat(file, &statbuf) == -1) {
487 #endif /* LARGE_FILE */
488 perror("stat error");
489 anyfail();
490 }
491 filesize = statbuf.st_size;
492
493 #ifdef LARGE_FILE
494 if ((fd = open64(file, O_RDWR)) == -1) {
495 #else /* LARGE_FILE */
496 if ((fd = open(file, O_RDWR)) == -1) {
497 #endif /* LARGE_FILE */
498 perror("open error");
499 anyfail();
500 }
501
502 if (statbuf.st_size - sparseoffset > SIZE_MAX) {
503 fprintf(stderr, "size_t overflow when setting up map\n");
504 anyfail();
505 }
506 mapsize = (size_t) (statbuf.st_size - sparseoffset);
507 mappages = roundup(mapsize, pagesize) / pagesize;
508 offset = sparseoffset;
509 if (do_offset) {
510 int pageoffset = lrand48() % mappages;
511 int byteoffset = pageoffset * pagesize;
512 offset += byteoffset;
513 mapsize -= byteoffset;
514 mappages -= pageoffset;
515 }
516 nloops = (randloops) ? (lrand48() % MAXLOOPS) : MAXLOOPS;
517
518 if (debug) {
519 #ifdef LARGE_FILE
520 (void)printf("child %d (pid %ld): seed %d, fsize %Ld, "
521 "mapsize %d, off %Ld, loop %d\n",
522 procno, getpid(), seed, filesize, mapsize,
523 offset / pagesize, nloops);
524 #else /* LARGE_FILE */
525 (void)printf("child %d (pid %d): seed %d, fsize %ld, "
526 "mapsize %ld, off %ld, loop %d\n",
527 procno, getpid(), seed, filesize, (long)mapsize,
528 offset / pagesize, nloops);
529 #endif /* LARGE_FILE */
530 }
531 #ifdef LARGE_FILE
532 if ((maddr = mmap64(0, mapsize, PROT_READ | PROT_WRITE, MAP_SHARED,
533 fd, offset)) == (caddr_t) - 1) {
534 #else /* LARGE_FILE */
535 if ((maddr = mmap(0, mapsize, PROT_READ | PROT_WRITE, MAP_SHARED,
536 fd, offset)) == (caddr_t) - 1) {
537 #endif /* LARGE_FILE */
538 perror("mmap error");
539 anyfail();
540 }
541
542 (void)close(fd);
543
544 /*
545 * Now loop read/writing random pages.
546 */
547 for (loopcnt = 0; loopcnt < nloops; loopcnt++) {
548 randpage = lrand48() % mappages;
549 paddr = maddr + (randpage * pagesize); /* page address */
550
551 if (randpage < mappages - 1 || !(mapsize % pagesize))
552 validsize = pagesize;
553 else
554 validsize = mapsize % pagesize;
555
556 for (i = procno; i < validsize; i += nprocs) {
557 if (*((unsigned char *)(paddr + i))
558 != ((procno + pattern) & 0xff)) {
559 (void)fprintf(stderr, "child %d: invalid data "
560 "<x%x>", procno,
561 *((unsigned char *)(paddr + i)));
562 (void)fprintf(stderr, " at pg %d off %d, exp "
563 "<x%x>\n", randpage, i,
564 (procno + pattern) & 0xff);
565 anyfail();
566 }
567
568 /*
569 * Now write it.
570 */
571 *(paddr + i) = (procno + pattern) & 0xff;
572 }
573 }
574 if (dosync) {
575 /*
576 * Exercise msync() as well!
577 */
578 randpage = lrand48() % mappages;
579 paddr = maddr + (randpage * pagesize); /* page address */
580 if (msync(paddr, (mappages - randpage) * pagesize,
581 MS_SYNC) == -1) {
582 anyfail();
583 }
584 }
585 if (munmap(maddr, mapsize) == -1) {
586 perror("munmap failed");
587 local_flag = FAILED;
588 anyfail();
589 }
590 exit(0);
591 }
592
593 /*
594 * Make sure file has all the correct data.
595 */
596 int fileokay(char *file, uchar_t * expbuf)
597 {
598 #ifdef LARGE_FILE
599 struct stat64 statbuf;
600 #else /* LARGE_FILE */
601 struct stat statbuf;
602 #endif /* LARGE_FILE */
603 size_t mapsize;
604 unsigned mappages;
605 unsigned pagesize = sysconf(_SC_PAGE_SIZE);
606 uchar_t readbuf[pagesize];
607 int fd;
608 int cnt;
609 unsigned i, j;
610
611 #ifdef LARGE_FILE
612 if ((fd = open64(file, O_RDONLY)) == -1) {
613 #else /* LARGE_FILE */
614 if ((fd = open(file, O_RDONLY)) == -1) {
615 #endif /* LARGE_FILE */
616 perror("open error");
617 /***** LTP Port *****/
618 local_flag = FAILED;
619 anyfail();
620 /***** ** *****/
621 return 0;
622 }
623 #ifdef LARGE_FILE
624 if (fstat64(fd, &statbuf) == -1) {
625 #else /* LARGE_FILE */
626 if (fstat(fd, &statbuf) == -1) {
627 #endif /* LARGE_FILE */
628 perror("stat error");
629 /***** LTP Port *****/
630 local_flag = FAILED;
631 anyfail();
632 /***** ** *****/
633 return 0;
634 }
635 #ifdef LARGE_FILE
636 if (lseek64(fd, sparseoffset, SEEK_SET) < 0) {
637 #else /* LARGE_FILE */
638 if (lseek(fd, sparseoffset, SEEK_SET) < 0) {
639 #endif /* LARGE_FILE */
640 perror("lseek");
641 anyfail();
642 }
643
644 if (statbuf.st_size - sparseoffset > SIZE_MAX) {
645 fprintf(stderr, "size_t overflow when setting up map\n");
646 anyfail();
647 }
648 mapsize = (size_t) (statbuf.st_size - sparseoffset);
649
650 mappages = roundup(mapsize, pagesize) / pagesize;
651
652 for (i = 0; i < mappages; i++) {
653 cnt = read(fd, readbuf, pagesize);
654 if (cnt == -1) {
655 perror("read error");
656 /***** LTP Port *****/
657 local_flag = FAILED;
658 anyfail();
659 /***** ** *****/
660 return 0;
661 } else if (cnt != pagesize) {
662 /*
663 * Okay if at last page in file...
664 */
665 if ((i * pagesize) + cnt != mapsize) {
666 (void)fprintf(stderr, "read %d of %ld bytes\n",
667 (i * pagesize) + cnt,
668 (long)mapsize);
669 close(fd);
670 return 0;
671 }
672 }
673 /*
674 * Compare read bytes of data.
675 */
676 for (j = 0; j < cnt; j++) {
677 if (expbuf[j] != readbuf[j]) {
678 (void)fprintf(stderr,
679 "read bad data: exp %c got %c)",
680 expbuf[j], readbuf[j]);
681 #ifdef LARGE_FILE
682 (void)fprintf(stderr, ", pg %d off %d, "
683 "(fsize %Ld)\n", i, j,
684 statbuf.st_size);
685 #else /* LARGE_FILE */
686 (void)fprintf(stderr, ", pg %d off %d, "
687 "(fsize %ld)\n", i, j,
688 statbuf.st_size);
689 #endif /* LARGE_FILE */
690 close(fd);
691 return 0;
692 }
693 }
694 }
695 close(fd);
696
697 return 1;
698 }
699
700 /*ARGSUSED*/ void finish(int sig)
701 {
702 finished++;
703 return;
704 }
705
706 unsigned int initrand(void)
707 {
708 unsigned int seed;
709
710 /*
711 * Initialize random seed... Got this from a test written
712 * by scooter:
713 * Use srand/rand to diffuse the information from the
714 * time and pid. If you start several processes, then
715 * the time and pid information don't provide much
716 * variation.
717 */
718 srand((unsigned int)getpid());
719 seed = rand();
720 srand((unsigned int)time(NULL));
721 seed = (seed ^ rand()) % 100000;
722 srand48((long int)seed);
723 return (seed);
724 }
725
726 /***** LTP Port *****/
727 void ok_exit(void)
728 {
729 tst_resm(TPASS, "Test passed");
730 tst_rmdir();
731 tst_exit();
732 }
733
734 int anyfail(void)
735 {
736 tst_brkm(TFAIL, tst_rmdir, "Test failed");
737 }
738
739 /***** ** ** *****/
740