1 /*
2 * Copyright (c) 2004 Daniel McNeil <daniel@osdl.org>
3 * 2004 Open Source Development Lab
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Module: .c
19 */
20
21 /*
22 * Change History:
23 *
24 * 2/2004 Marty Ridgeway (mridge@us.ibm.com) Changes to adapt to LTP
25 *
26 */
27 #define _GNU_SOURCE
28
29 #include <stdlib.h>
30 #include <sys/types.h>
31 #include <signal.h>
32 #include <fcntl.h>
33 #include <stdio.h>
34 #include <unistd.h>
35
36 #include "common_checkzero.h"
37
read_eof(char * filename)38 int read_eof(char *filename)
39 {
40 int fd;
41 int i;
42 int r;
43 char buf[4096];
44
45 if ((fd = open(filename, O_RDWR)) < 0) {
46 fprintf(stderr, "can't open file %s \n", filename);
47 exit(1);
48 }
49
50 for (i = 0; i < 100000; i++) {
51 off_t offset;
52 char *bufoff;
53
54 offset = lseek(fd, 4096, SEEK_END);
55 r = write(fd, "A", 1);
56
57 offset = lseek(fd, offset - 4096, SEEK_SET);
58
59 r = read(fd, buf, 4096);
60 if (r > 0) {
61 if ((bufoff = check_zero(buf, r))) {
62 fprintf(stderr, "non-zero read at offset %p\n",
63 offset + bufoff);
64 exit(1);
65 }
66 }
67 }
68 fprintf(stderr, "read_checkzero done\n");
69 return 0;
70 }
71
main(int argc,char ** argv)72 int main(int argc, char **argv)
73 {
74 if (argc < 2) {
75 printf("You must pass a filename to the test \n");
76 exit(1);
77 }
78
79 char *filename = argv[1];
80
81 read_eof(filename);
82
83 return 0;
84 }
85