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/* this file is public domain */
/* return values:
* 3 - invocation error
* 2 - no LFS support
* 1 - file creation failed
* 0 - okay!
*/
#include "tweak.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc,char *argv[])
{
off_t GB=1024*1024*1024;
FILE *fd;
off_t pos;
float size;
if(argc<3)
{
printf("Makes a large file with hole using fseeko\n");
printf("%s <filename> <floating point size in GB>\n",argv[0]);
return 3;
}
fd = fopen(argv[1],"w");
if(fd == NULL)
{
perror("fopen");
return 1;
}
size=atof(argv[2]);
#if SIZEOF_OFF_T <= 4
if(size>2)
{
printf("You do not have LFS your system.\nMaximum supported filesize is 2 GB.\n");
return 2;
}
#endif
pos=size*GB;
if(fseeko(fd,pos,SEEK_SET))
{
perror("fseeko");
return 1;
}
if(fwrite("!",1,1,fd)<1)
{
perror("write");
return 1;
}
if(fclose(fd))
{
perror("fclose");
return 1;
}
return 0;
}
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