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 * Test Name: mremap03
22 *
23 * Test Description:
24 *  Verify that,
25 *   mremap() fails when used to expand the existing virtual memory mapped
26 *   region to the requested size, if there already exists mappings that
27 *   cover the whole address space requsted or the old address specified was
28 *   not mapped.
29 *
30 * Expected Result:
31 *  mremap() should return -1 and set errno to EFAULT.
32 *
33 * Algorithm:
34 *  Setup:
35 *   Setup signal handling.
36 *   Pause for SIGUSR1 if option specified.
37 *
38 *  Test:
39 *   Loop if the proper options are given.
40 *   Execute system call
41 *   Check return code, if system call failed (return=-1)
42 *	if errno set == expected errno
43 *		Issue sys call fails with expected return value and errno.
44 *	Otherwise,
45 *		Issue sys call fails with unexpected errno.
46 *   Otherwise,
47 *	Issue sys call returns unexpected value.
48 *
49 *  Cleanup:
50 *   Print errno log and/or timing stats if options given
51 *
52 * Usage:  <for command-line>
53 *  mremap03 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
54 *     where,  -c n : Run n copies concurrently.
55 *             -e   : Turn on errno logging.
56 *	       -i n : Execute test n times.
57 *	       -I x : Execute test for x seconds.
58 *	       -p x : Pause for x seconds between iterations.
59 *	       -t   : Turn on syscall timing.
60 *
61 * HISTORY
62 *	07/2001 Ported by Wayne Boyer
63 *
64 *      11/09/2001 Manoj Iyer (manjo@austin.ibm.com)
65 *      Modified.
66 *      - #include <linux/mman.h> should not be included as per man page for
67 *        mremap, #include <sys/mman.h> alone should do the job. But inorder
68 *        to include definition of MREMAP_MAYMOVE defined in bits/mman.h
69 *        (included by sys/mman.h) __USE_GNU needs to be defined.
70 *        There may be a more elegant way of doing this...
71 *
72 *
73 * RESTRICTIONS:
74 *  None.
75 */
76#include <errno.h>
77#include <unistd.h>
78#include <fcntl.h>
79#define __USE_GNU
80#include <sys/mman.h>
81#undef __USE_GNU
82
83#include "test.h"
84
85char *TCID = "mremap03";
86int TST_TOTAL = 1;
87char *addr;			/* addr of memory mapped region */
88int memsize;			/* memory mapped size */
89int newsize;			/* new size of virtual memory block */
90
91void setup();			/* Main setup function of test */
92void cleanup();			/* cleanup function for the test */
93
94#if !defined(UCLINUX)
95int main(int ac, char **av)
96{
97	int lc;
98
99	tst_parse_opts(ac, av, NULL, NULL);
100
101	setup();
102
103	for (lc = 0; TEST_LOOPING(lc); lc++) {
104
105		tst_count = 0;
106
107		/*
108		 * Attempt to expand the existing mapped
109		 * memory region (memsize) by newsize limits
110		 * using mremap() should fail as specifed old
111		 * virtual address was not mapped.
112		 */
113		errno = 0;
114		addr = mremap(addr, memsize, newsize, MREMAP_MAYMOVE);
115		TEST_ERRNO = errno;
116
117		/* Check for the return value of mremap() */
118		if (addr != MAP_FAILED) {
119			tst_resm(TFAIL,
120				 "mremap returned invalid value, expected: -1");
121
122			/* Unmap the mapped memory region */
123			if (munmap(addr, newsize) != 0) {
124				tst_brkm(TFAIL, cleanup, "munmap fails to "
125					 "unmap the expanded memory region, "
126					 " error=%d", errno);
127			}
128			continue;
129		}
130
131		/* Check for the expected errno */
132		if (errno == EFAULT) {
133			tst_resm(TPASS, "mremap() Fails, 'old region not "
134				 "mapped', errno %d", TEST_ERRNO);
135		} else {
136			tst_resm(TFAIL, "mremap() Fails, "
137				 "'Unexpected errno %d", TEST_ERRNO);
138		}
139	}
140
141	cleanup();
142	tst_exit();
143
144}
145
146/*
147 * setup() - performs all ONE TIME setup for this test.
148 *
149 * Get system page size.
150 * Set the old address point some high address which is not mapped.
151 */
152void setup(void)
153{
154	int page_sz;		/* system page size */
155
156	tst_sig(FORK, DEF_HANDLER, cleanup);
157
158	TEST_PAUSE;
159
160	/* Get the system page size */
161	if ((page_sz = getpagesize()) < 0) {
162		tst_brkm(TFAIL, NULL,
163			 "getpagesize() fails to get system page size");
164	}
165
166	/* Get the size of virtual memory area to be mapped */
167	memsize = (1000 * page_sz);
168
169	/* Get the New size of virtual memory block after resize */
170	newsize = (memsize * 2);
171
172	/*
173	 * Set the old virtual address point to some address
174	 * which is not mapped.
175	 */
176	addr = (char *)get_high_address();
177}
178
179/*
180 * cleanup() - performs all ONE TIME cleanup for this test at
181 *             completion or premature exit.
182 */
183void cleanup(void)
184{
185
186	/* Exit the program */
187
188}
189
190#else
191
192int main(void)
193{
194	tst_resm(TINFO, "test is not available on uClinux");
195	tst_exit();
196}
197
198#endif /* if !defined(UCLINUX) */
199