2 * Copyright (c) 1995 - 2001 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
40 #include <sys/types.h>
50 write_random_file(int fd
, size_t sz
)
57 err(1, "malloc %u", (unsigned)sz
);
59 for (i
= 0; i
< sz
; ++i
)
62 if (write(fd
, buf
, sz
) != sz
)
69 write_null_file(int fd
, size_t sz
)
76 err(1, "malloc %u", (unsigned)sz
);
78 for (i
= 0; i
< sz
; ++i
)
81 if (write(fd
, buf
, sz
) != sz
)
88 read_file(int fd
, size_t sz
)
95 err(1, "malloc %u", (unsigned)sz
);
96 ret
= read(fd
, buf
, sz
);
100 errx(1, "EOF on read");
105 #define MAP_FAILED ((void *)-1)
109 main(int argc
, char **argv
)
111 const char *file
= "foo";
112 const size_t sz
= 16384;
121 fd
= open(file
, O_RDWR
| O_CREAT
, 0);
123 err(1, "open %s", file
);
125 if (lseek(fd
, 0, SEEK_SET
) < 0)
127 write_null_file(fd
, sz
);
128 if (lseek(fd
, 0, SEEK_SET
) < 0)
130 read_buf1
= read_file(fd
, sz
);
131 if (lseek(fd
, 0, SEEK_SET
) < 0)
133 random_buf
= write_random_file(fd
, sz
);
134 if (lseek(fd
, 0, SEEK_SET
) < 0)
136 read_buf2
= read_file(fd
, sz
);
140 if (memcmp(random_buf
, read_buf2
, sz
) != 0)