1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/*
* Author: Colin King <colin.king@canonical.com>
*
* Copyright (C) 2012 Canonical, Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <inttypes.h>
#define TEST_PASSED (0)
#define TEST_FAILED (1)
#define TEST_ERROR (2)
/*
* Attempt to create a file with lots of holes, a bit like downloading
* an ISO with a torrent client with many multiple random writes
*/
#define BUF_SZ 32
#define DEFAULT_SIZE (660*1024) /* CD-ROM Size */
int test_write(int fd, char *buffer, size_t len, off_t offset)
{
ssize_t rc;
if (lseek(fd, offset, SEEK_SET) < 0) {
fprintf(stderr, "Failed to seek to position %jd: %s\n",
(intmax_t)offset, strerror(errno));
return TEST_FAILED;
}
rc = write(fd, buffer, len);
if (rc < 0) {
fprintf(stderr, "Failed to write %zu bytes, position %jd: %s\n",
len, (intmax_t)offset, strerror(errno));
return TEST_FAILED;
} else if (((size_t)rc) < len) {
fprintf(stderr, "Failed to write %zu bytes, position %jd: short write of %zd bytes\n",
len, (intmax_t)offset, rc);
return TEST_FAILED;
}
return TEST_PASSED;
}
int test_read(int fd, char *buffer, size_t len, off_t offset)
{
ssize_t rc;
if (lseek(fd, offset, SEEK_SET) < 0) {
fprintf(stderr, "Failed to seek to position %jd: %s\n",
(intmax_t)offset, strerror(errno));
return TEST_FAILED;
}
rc = read(fd, buffer, len);
if (rc < 0) {
fprintf(stderr, "Failed to read %zu bytes, position %jd: %s\n",
len, (intmax_t)offset, strerror(errno));
return TEST_FAILED;
} else if (((size_t)rc) < len) {
fprintf(stderr, "Failed to read %zu bytes, position %jd: short read of %zd bytes\n",
len, (intmax_t)offset, rc);
return TEST_FAILED;
}
return TEST_PASSED;
}
int test_write_read(int fd, char *buffer1, size_t len, off_t offset)
{
char buffer2[BUF_SZ];
int ret;
memset(buffer2, 0, BUF_SZ);
if ((ret = test_write(fd, buffer1, BUF_SZ, offset)) != 0)
return ret;
if ((ret = test_read(fd, buffer2, BUF_SZ, offset)) != 0)
return ret;
if (memcmp(buffer1, buffer2, BUF_SZ)) {
fprintf(stderr, "Data read is not same as data written, offset = %jd",
(intmax_t)offset);
return TEST_FAILED;
}
return TEST_PASSED;
}
int test_exercise(char *filename, off_t max_offset, char data)
{
int fd;
int i;
int ret = TEST_FAILED;
struct stat statbuf;
char buffer1[BUF_SZ];
memset(buffer1, data, BUF_SZ);
srandom((unsigned int)max_offset);
unlink(filename);
if ((fd = open(filename, O_RDWR | O_CREAT, 0600)) < 0) {
fprintf(stderr, "Failed to open %s: %s\n", filename, strerror(errno));
return TEST_FAILED;
}
if (test_write_read(fd, buffer1, BUF_SZ, 0))
goto finish;
for (i=0; i<8192; i++) {
off_t offset = (off_t)random() % max_offset;
if (test_write_read(fd, buffer1, BUF_SZ, offset))
goto finish;
}
if (test_write_read(fd, buffer1, BUF_SZ, max_offset))
goto finish;
srandom((unsigned int)max_offset);
for (i=0; i<8192; i++) {
char buffer2[BUF_SZ];
off_t offset = (off_t)random() % max_offset;
if (test_read(fd, buffer2, BUF_SZ, offset))
goto finish;
if (memcmp(buffer1, buffer2, BUF_SZ)) {
fprintf(stderr, "Data read is not same as data written, offset = %jd",
(intmax_t)offset);
goto finish;
}
}
if (fstat(fd, &statbuf) < 0) {
fprintf(stderr, "Failed to fstat file %s: %s\n", filename, strerror(errno));
goto finish;
}
if (statbuf.st_size != max_offset + BUF_SZ) {
fprintf(stderr, "Filesize was %jd and not %jd\n",
(intmax_t)statbuf.st_size,
(intmax_t)(max_offset + BUF_SZ));
goto finish;
}
ret = TEST_PASSED;
finish:
if (close(fd) < 0) {
fprintf(stderr, "Failed to close %s: %s\n", filename, strerror(errno));
return TEST_FAILED;
}
if (unlink(filename) < 0) {
fprintf(stderr, "Failed to unlink %s: %s\n", filename, strerror(errno));
return TEST_FAILED;
}
return ret;
}
void sighandler(int dummy)
{
exit(TEST_ERROR);
}
int main(int argc, char **argv)
{
off_t len = DEFAULT_SIZE;
int i;
int ret;
if (argc < 2) {
fprintf(stderr, "Syntax: filename [size_in_K]\n");
exit(TEST_ERROR);
}
if (argc == 3) {
len = atoll(argv[2]);
if (len < 1) {
fprintf(stderr, "size should be > 0\n");
exit(TEST_ERROR);
}
}
len *= 1024;
signal(SIGINT, sighandler);
for (i=0; i < 2; i++) {
ret = test_exercise(argv[1], len, i + '@');
if (ret != TEST_PASSED)
exit(ret);
}
exit(TEST_PASSED);
}
|
