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1 /*
2  * Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org>
3  * Copyright (c) 2015-2017 The strace developers.
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  * 3. The name of the author may not be used to endorse or promote products
15  *    derived from this software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  */
28 
29 #include "tests.h"
30 #include <stdio.h>
31 #include <stdint.h>
32 #include <unistd.h>
33 #include <limits.h>
34 #include <sys/mman.h>
35 
36 int
main(int ac,char ** av)37 main(int ac, char **av)
38 {
39 	const char *const name = ac > 1 ? av[1] : "mmap";
40 	const intmax_t pagesize = get_page_size();
41 	const unsigned long length1 = pagesize * 6;
42 	const unsigned long length2 = pagesize * 3;
43 	const unsigned long length3 = pagesize * 2;
44 	const int fd = -1;
45 	off_t offset;
46 	void *addr, *p;
47 
48 #if ULONG_MAX > 4294967295UL
49 	offset = 0xcafedeadbeef000ULL & -pagesize;
50 	addr = (void *) (uintmax_t) (0xfacefeed000 & -pagesize);
51 #else
52 	offset = 0xdeadbeef000ULL & -pagesize;
53 	addr = (void *) (unsigned int) (0xfaced000 & -pagesize);
54 #endif
55 	const uintmax_t uoffset =
56 	       sizeof(offset) == sizeof(int) ? (uintmax_t) (unsigned int) offset
57 					     : (uintmax_t) offset;
58 
59 	(void) close(0);
60 	(void) close(0);
61 	printf("%s(NULL, 0, PROT_NONE, MAP_FILE, 0, 0) = -1 EBADF (%m)\n",
62 	       name);
63 	mmap(NULL, 0, PROT_NONE, MAP_FILE, 0, 0);
64 
65 	p = mmap(addr, length1, PROT_READ | PROT_WRITE,
66 		 MAP_PRIVATE | MAP_ANONYMOUS, fd, offset);
67 	if (MAP_FAILED == p)
68 		perror_msg_and_fail("mmap");
69 	printf("%s(%p, %lu, PROT_READ|PROT_WRITE, "
70 	       "MAP_PRIVATE|MAP_ANONYMOUS, %d, %#jx) = %p\n",
71 	       name, addr, length1, fd, uoffset, p);
72 
73 	if (msync(p, length1, MS_SYNC))
74 		perror_msg_and_fail("msync");
75 	printf("msync(%p, %lu, MS_SYNC) = 0\n", p, length1);
76 
77 	if (mprotect(p, length1, PROT_NONE))
78 		perror_msg_and_fail("mprotect");
79 	printf("mprotect(%p, %lu, PROT_NONE) = 0\n", p, length1);
80 
81 	addr = mremap(p, length1, length2, 0);
82 	if (MAP_FAILED == addr)
83 		perror_msg_and_fail("mremap");
84 	printf("mremap(%p, %lu, %lu, 0) = %p\n", p, length1, length2, addr);
85 
86 	p =  mremap(addr, length2, length3, MREMAP_MAYMOVE | MREMAP_FIXED,
87 		    addr + length2);
88 	if (MAP_FAILED == p)
89 		perror_msg_and_fail("mremap");
90 	printf("mremap(%p, %lu, %lu, MREMAP_MAYMOVE|MREMAP_FIXED"
91 	       ", %p) = %p\n", addr, length2, length3, addr + length2, p);
92 
93 	if (munmap(p, length3))
94 		perror_msg_and_fail("munmap");
95 	printf("munmap(%p, %lu) = 0\n", p, length3);
96 
97 	if (mlockall(MCL_FUTURE))
98 		perror_msg_and_fail("mlockall");
99 	puts("mlockall(MCL_FUTURE) = 0");
100 
101 	puts("+++ exited with 0 +++");
102 	return 0;
103 }
104