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#include <stdio.h>
#include <stdlib.h>

int compareFile(FILE *old, FILE *new);

int main()
{
FILE *new;
FILE *old;
int lRet;
static first = 0;

system("touch file_new");
system("touch file_old");

new = fopen("file_new", "rw");
old = fopen("file_old", "rw");

while(1)
{
sleep(1);
system("dmesg > file_new");

if (first == 0)
{
system("cp file_new file_old");
first++;
continue;
}

new = fopen("file_new", "rw");
old = fopen("file_old", "rw");

if (compareFile(new, old) == 0)
{
fclose(new);
fclose(old);
continue;
}
else
{
fclose(new);
fclose(old);

system("diff file_new file_old");
system("cp file_new file_old");
}
}
return 0;
}

int compareFile(FILE *old, FILE *new)
{
char c1;
char c2;

while(!feof(old) && !feof(new))
{
c1 = fgetc(old);
c2 = fgetc(new);

if (c1 != c2)
{
return -1;
}
}

if ((c1 == EOF)&&(c2 == EOF))
{
return 0;
}
return -1;
}