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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#define BLOCK_SIZE 4096
void *buf;
int main(int argc, char **argv)
{
buf = malloc (512);
memset (buf,"a",512);
int fd = 0;
int i;
int sector_per_block = BLOCK_SIZE/512;
int block_count = 4;
if(argc != 2) {
printf ("Wrong usage\n USAGE: program absolute_path_to_write\n");
_exit (-1);
}
fd = open (argv[1],O_RDWR | O_CREAT,0666);
if (fd <= 0) {
printf ("file open failed\n");
_exit (0);
}
while (block_count > 0) {
lseek (fd, BLOCK_SIZE, SEEK_CUR);
block_count--;
for(i = 0; i < sector_per_block; i++)
write (fd, buf, 512);
block_count--;
}
close(fd);
return 0;
}
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