1 /* Trivia program to corrupt an RDB file in order to check the RDB check
2 * program behavior and effectiveness.
3 *
4 * Copyright (C) 2016 Salvatore Sanfilippo.
5 * This software is released in the 3-clause BSD license. */
6
7 #include <stdio.h>
8 #include <fcntl.h>
9 #include <sys/stat.h>
10 #include <stdlib.h>
11 #include <unistd.h>
12 #include <time.h>
13
main(int argc,char ** argv)14 int main(int argc, char **argv) {
15 struct stat stat;
16 int fd, cycles;
17
18 if (argc != 3) {
19 fprintf(stderr,"Usage: <filename> <cycles>\n");
20 exit(1);
21 }
22
23 srand(time(NULL));
24 char *filename = argv[1];
25 cycles = atoi(argv[2]);
26 fd = open(filename,O_RDWR);
27 if (fd == -1) {
28 perror("open");
29 exit(1);
30 }
31 fstat(fd,&stat);
32
33 while(cycles--) {
34 unsigned char buf[32];
35 unsigned long offset = rand()%stat.st_size;
36 int writelen = 1+rand()%31;
37 int j;
38
39 for (j = 0; j < writelen; j++) buf[j] = (char)rand();
40 lseek(fd,offset,SEEK_SET);
41 printf("Writing %d bytes at offset %lu\n", writelen, offset);
42 write(fd,buf,writelen);
43 }
44 return 0;
45 }
46