[code:1]#include<stdio.h>
#include<unistd.h>
#include<fcntl.h>
#define SIZE 1024
#define LOGFILE "/var/log/secure"
int main(int argc,char *argv[])
{
int fd,i;
unsigned long int filesize1=0,filesize2=0;
char buf[SIZE];
int a;
if((fd=open(LOGFILE,O_RDONLY))==-1)
{
perror("LOGFILE error");
exit(1);
}
while((i=read(fd,buf,SIZE))>0) filesize1+=i;
filesize1=lseek(fd,0,SEEK_END);
i=0;
while(1)
{
