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/* test large file compile environment and make a large sparse file
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
void fatal(const char *s)
{
printf("makesparse: %s\n",s);
exit(1);
}
int main(int argc, char ** argv)
{
struct stat s;
int f;
unsigned long long pos;
char *bla="bla bla bla\n";
printf("sizeof st_size = %d\n",sizeof(s.st_size));
if(sizeof(s.st_size)<8) fatal("Large file compile environment not present!");
if(argc!=2) fatal("Wrong number of args");
f=open(argv[1],O_RDWR);
if(!f) fatal("Open failed");
pos=(unsigned long long)(4LL*1024LL*1024LL*1024LL);
if(lseek(f,(off_t)pos,SEEK_SET)==((off_t)-1))
{ perror("lseek"); fatal("lseek failed"); }
if(!write(f,bla,strlen(bla))) { perror("write"); fatal("write failed"); }
close(f);
if(lstat(argv[1],&s)) { perror("stat"); fatal("stat failed"); }
if(s.st_size!=pos+strlen(bla))
fatal("created file does not have the expected length");
return 0;
}
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