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Member "afio-2.5.2/regtest/makesparse.c" (30 Nov 2018, 1108 Bytes) of package /linux/misc/afio-2.5.2.tgz:
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1
2 /* test large file compile environment and make a large sparse file
3 */
4
5 #include <stdio.h>
6 #include <string.h>
7 #include <unistd.h>
8 #include <sys/stat.h>
9 #include <time.h>
10 #include <sys/types.h>
11 #include <sys/stat.h>
12 #include <fcntl.h>
13 #include <errno.h>
14
15
16 void fatal(const char *s)
17 {
18 printf("makesparse: %s\n",s);
19 exit(1);
20 }
21
22
23 int main(int argc, char ** argv)
24 {
25 struct stat s;
26 int f;
27 unsigned long long pos;
28 char *bla="bla bla bla\n";
29
30 printf("sizeof st_size = %d\n",sizeof(s.st_size));
31
32 if(sizeof(s.st_size)<8) fatal("Large file compile environment not present!");
33
34 if(argc!=2) fatal("Wrong number of args");
35
36 f=open(argv[1],O_RDWR);
37
38 if(!f) fatal("Open failed");
39
40 pos=(unsigned long long)(4LL*1024LL*1024LL*1024LL);
41
42 if(lseek(f,(off_t)pos,SEEK_SET)==((off_t)-1))
43 { perror("lseek"); fatal("lseek failed"); }
44
45 if(!write(f,bla,strlen(bla))) { perror("write"); fatal("write failed"); }
46
47 close(f);
48
49 if(lstat(argv[1],&s)) { perror("stat"); fatal("stat failed"); }
50
51 if(s.st_size!=pos+strlen(bla))
52 fatal("created file does not have the expected length");
53
54 return 0;
55 }
56