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