2 * Copyright (c) 2000 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43 #include <sys/types.h>
55 #define MAP_FAILED ((void *)-1)
61 doit (const char *filename
)
67 fd
= open (filename
, O_RDWR
| O_CREAT
| O_TRUNC
, 0600);
69 err (1, "open %s", filename
);
70 ret
= ftruncate (fd
, 1);
72 err (1, "ftruncate %s", filename
);
73 buf
= mmap (NULL
, 1, PROT_READ
| PROT_WRITE
, MAP_SHARED
, fd
, 0);
74 if (buf
== (void *) MAP_FAILED
)
76 if (fchmod (fd
, 0) < 0)
77 err (1, "fchmod %s, 0", filename
);
80 err (1, "close %s", filename
);
81 *((char *)buf
) = 0x17;
82 ret
= munmap (buf
, 1);
88 main(int argc
, char **argv
)
90 const char *file
= "foo";
92 setprogname (argv
[0]);
93 if (argc
!= 1 && argc
!= 2)
94 errx (1, "usage: %s [file]", argv
[0]);