2 * Copyright (c) 2001, 2006 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 #define BLOCK_SIZE (256*1024)
54 * unlink a dirty, open file. The resulting installattr used to make
55 * nnpfs truncate the open file to zero.
59 writeat(int fd
, off_t offset
, char *buf
, size_t sz
)
61 if (lseek(fd
, offset
, SEEK_SET
) != offset
)
62 err(1, "lseek/w at %llu", (unsigned long long)offset
);
64 if (write(fd
, buf
, sz
) != sz
)
65 err(1, "write at %llu", (unsigned long long)offset
);
69 readat(int fd
, off_t offset
, char *buf
, const char *data
, size_t sz
)
71 if (lseek(fd
, offset
, SEEK_SET
) != offset
)
72 err(1, "lseek/r at %llu", (unsigned long long)offset
);
74 if (read(fd
, buf
, sz
) != sz
)
75 err(1, "read at %llu", (unsigned long long)offset
);
77 if (memcmp(buf
, data
, sz
)) {
78 fprintf(stderr
, "read %x, expected %x\n",
79 *(unsigned*)buf
, *(unsigned*)data
);
80 errx(1, "memcmp at %llu", (unsigned long long)offset
);
85 doit(const char *filename
)
89 char *databuf
= malloc(BUF_SIZE
);
90 char *scratch
= malloc(BUF_SIZE
);
92 if (!databuf
|| !scratch
)
93 errx(1, "malloc failed");
95 memset(databuf
, 0xe3, BUF_SIZE
);
97 fd
= open(filename
, O_RDWR
| O_TRUNC
| O_CREAT
, 0666);
99 err(1, "open %s", filename
);
101 writeat(fd
, BLOCK_SIZE
, databuf
, BUF_SIZE
);
103 if (unlink(filename
) < 0)
104 err(1, "unlink %s", filename
);
106 readat(fd
, BLOCK_SIZE
, scratch
, databuf
, BUF_SIZE
);
109 err(1, "close %s", filename
);
116 main(int argc
, char **argv
)
118 setprogname(argv
[0]);
125 errx(1, "usage: %s [filename]", argv
[0]);