1/*
2 * Copyright (c) International Business Machines  Corp., 2003
3 *
4 * This program is free software;  you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY;  without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
12 * the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program;  if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19/*
20 * Test Description:
21 *  Verify that truncating a mmaped file works correctly.
22 *
23 * Expected Result:
24 *  ftruncate should be allowed to increase, decrease, or zero the
25 *  size of a file that has been mmaped
26 *
27 *  Test:
28 *   Use ftruncate to shrink the file while it is mapped
29 *   Use ftruncate to grow the file while it is mapped
30 *   Use ftruncate to zero the size of the file while it is mapped
31 *
32 * HISTORY
33 *	04/2003 Written by Paul Larson
34 */
35#include <stdio.h>
36#include <unistd.h>
37#include <fcntl.h>
38#include <errno.h>
39#include <sys/mman.h>
40#include <sys/types.h>
41#include "test.h"
42
43#define mapsize (1 << 14)
44
45char *TCID = "mmap09";
46int TST_TOTAL = 3;
47
48static int fd;
49static char *maddr;
50
51static struct test_case_t {
52	off_t newsize;
53	char *desc;
54} TC[] = {
55	{mapsize - 8192, "ftruncate mmaped file to a smaller size"},
56	{mapsize + 1024, "ftruncate mmaped file to a larger size"},
57	{0, "ftruncate mmaped file to 0 size"},
58};
59
60static void setup(void);
61static void cleanup(void);
62
63int main(int argc, char **argv)
64{
65	int lc;
66	int i;
67
68	tst_parse_opts(argc, argv, NULL, NULL);
69
70	setup();
71
72	for (lc = 0; TEST_LOOPING(lc); lc++) {
73		tst_count = 0;
74		for (i = 0; i < TST_TOTAL; i++) {
75			TEST(ftruncate(fd, TC[i].newsize));
76
77			if (TEST_RETURN == -1) {
78				tst_resm(TFAIL | TTERRNO, "%s", TC[i].desc);
79			} else {
80				tst_resm(TPASS, "%s", TC[i].desc);
81			}
82		}
83
84	}
85
86	cleanup();
87	tst_exit();
88}
89
90static void setup(void)
91{
92	tst_sig(NOFORK, DEF_HANDLER, cleanup);
93
94	TEST_PAUSE;
95
96	tst_tmpdir();
97
98	if ((fd = open("mmaptest", O_RDWR | O_CREAT, 0666)) < 0)
99		tst_brkm(TFAIL | TERRNO, cleanup, "opening mmaptest failed");
100
101	/* ftruncate the file to 16k */
102	if (ftruncate(fd, mapsize) < 0)
103		tst_brkm(TFAIL | TERRNO, cleanup, "ftruncate file failed");
104
105	maddr = mmap(0, mapsize, PROT_READ | PROT_WRITE,
106		     MAP_FILE | MAP_SHARED, fd, 0);
107	if (maddr == MAP_FAILED)
108		tst_brkm(TFAIL | TERRNO, cleanup, "mmapping mmaptest failed");
109
110	/* fill up the file with A's */
111	memset(maddr, 'A', mapsize);
112}
113
114static void cleanup(void)
115{
116	munmap(maddr, mapsize);
117	close(fd);
118	tst_rmdir();
119}
120