1 /* $OpenBSD: mmaptest.c,v 1.5 2004/10/10 03:08:30 mickey Exp $ */
2
3 /*
4 * Copyright (c) 2001 Niklas Hallqvist. 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 * 4. 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 <sys/types.h>
30 #include <sys/mman.h>
31 #include <err.h>
32 #include <fcntl.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <unistd.h>
36
37 #define TEMPL "test-fileXXXXXXXXXX"
38 #define MAGIC 0x1234
39
40 int
main(int argc,char ** argv)41 main(int argc, char **argv)
42 {
43 int fd;
44 void *v;
45 int i;
46 ssize_t n;
47 static char nm[] = TEMPL;
48 off_t sz;
49
50 fd = mkstemp(nm);
51 if (fd == -1)
52 err(1, "mkstemp");
53 sz = sysconf(_SC_PAGESIZE);
54 if (sz == -1)
55 err(1, "sysconf");
56 if (ftruncate(fd, sz) == -1)
57 err(1, "ftruncate");
58 v = mmap(0, sz, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
59 if (v == MAP_FAILED)
60 err(1, "mmap");
61 *(int *)v = MAGIC;
62 if (msync(v, sz, MS_SYNC) == -1)
63 err(1, "msync");
64 if (munmap(v, sz) == -1)
65 err(1, "munmap");
66 if (close(fd) == -1)
67 err(1, "close");
68 fd = open(nm, O_RDONLY);
69 if (fd == -1)
70 err(1, "open");
71 if (unlink(nm) == -1)
72 err(1, "unlink");
73 n = read(fd, &i, sizeof i);
74 if (n == -1)
75 err(1, "read");
76 if (n != sizeof i)
77 errx(1, "short read");
78 if (close(fd) == -1)
79 err(1, "close");
80 exit(i != MAGIC);
81 }
82