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: mremap02
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 the virtual memory area previously
27 *   mapped was not page aligned or invalid argument specified.
28 *
29 * Expected Result:
30 *  mremap() should return -1 and set errno to EINVAL.
31 *
32 * Algorithm:
33 *  Setup:
34 *   Setup signal handling.
35 *   Pause for SIGUSR1 if option specified.
36 *
37 *  Test:
38 *   Loop if the proper options are given.
39 *   Execute system call
40 *   Check return code, if system call failed (return=-1)
41 *	if errno set == expected errno
42 *		Issue sys call fails with expected return value and errno.
43 *	Otherwise,
44 *		Issue sys call fails with unexpected errno.
45 *   Otherwise,
46 *	Issue sys call returns unexpected value.
47 *
48 *  Cleanup:
49 *   Print errno log and/or timing stats if options given
50 *
51 * Usage:  <for command-line>
52 *  mremap02 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
53 *     where,  -c n : Run n copies concurrently.
54 *	       -e   : Turn on errno logging.
55 *	       -i n : Execute test n times.
56 *	       -I x : Execute test for x seconds.
57 *	       -p x : Pause for x seconds between iterations.
58 *	       -t   : Turn on syscall timing.
59 *
60 * HISTORY
61 *	07/2001 Ported by Wayne Boyer
62 *
63 *      11/09/2001 Manoj Iyer (manjo@austin.ibm.com)
64 *      Modified.
65 *      - #include <linux/mman.h> should not be included as per man page for
66 *        mremap, #include <sys/mman.h> alone should do the job. But inorder
67 *        to include definition of MREMAP_MAYMOVE defined in bits/mman.h
68 *        (included by sys/mman.h) __USE_GNU needs to be defined.
69 *        There may be a more elegant way of doing this...
70 *
71 *
72 * RESTRICTIONS:
73 *  None.
74 */
75#define _GNU_SOURCE
76#include <errno.h>
77#include <unistd.h>
78#include <fcntl.h>
79#include <sys/mman.h>
80
81#include "test.h"
82
83char *TCID = "mremap02";
84int TST_TOTAL = 1;
85char *addr;			/* addr of memory mapped region */
86int memsize;			/* memory mapped size */
87int newsize;			/* new size of virtual memory block */
88
89void setup();			/* Main setup function of test */
90void cleanup();			/* cleanup function for the test */
91
92int main(int ac, char **av)
93{
94	int lc;
95
96	tst_parse_opts(ac, av, NULL, NULL);
97
98	setup();
99
100	for (lc = 0; TEST_LOOPING(lc); lc++) {
101
102		tst_count = 0;
103
104		/*
105		 * Attempt to expand the existing mapped
106		 * memory region (memsize) by newsize limits using
107		 * mremap() should fail as old virtual address is not
108		 * page aligned.
109		 */
110		errno = 0;
111		addr = mremap(addr, memsize, newsize, MREMAP_MAYMOVE);
112		TEST_ERRNO = errno;
113
114		/* Check for the return value of mremap() */
115		if (addr != MAP_FAILED) {
116			tst_resm(TFAIL,
117				 "mremap returned invalid value, expected: -1");
118
119			/* Unmap the mapped memory region */
120			if (munmap(addr, newsize) != 0) {
121				tst_brkm(TBROK, cleanup, "munmap fails to "
122					 "unmap the expanded memory region, "
123					 "error=%d", errno);
124			}
125			continue;
126		}
127
128		if (errno == EINVAL) {
129			tst_resm(TPASS, "mremap() Failed, 'invalid argument "
130				 "specified' - errno %d", TEST_ERRNO);
131		} else {
132			tst_resm(TFAIL, "mremap() Failed, "
133				 "'Unexpected errno %d", TEST_ERRNO);
134		}
135	}
136
137	cleanup();
138	tst_exit();
139
140}
141
142/*
143 * setup() - performs all ONE TIME setup for this test.
144 *
145 * Get system page size, Set the size of virtual memory area and the
146 * new size after resize, Set the virtual memory address such that it
147 * is not aligned.
148 */
149void setup(void)
150{
151
152	tst_sig(FORK, DEF_HANDLER, cleanup);
153
154	TEST_PAUSE;
155
156	/* Get the system page size */
157	if ((memsize = getpagesize()) < 0) {
158		tst_brkm(TFAIL, NULL,
159			 "getpagesize() fails to get system page size");
160	}
161
162	/* Get the New size of virtual memory block after resize */
163	newsize = (memsize * 2);
164
165	/* Set the old virtual memory address */
166	addr = (char *)(addr + (memsize - 1));
167}
168
169/*
170 * cleanup() - performs all ONE TIME cleanup for this test at
171 *             completion or premature exit.
172 */
173void cleanup(void)
174{
175
176	/* Exit the program */
177
178}
179