I wanna know indepth about the COW implementation of
fork() in Linux 2.4 and higher - all including page
table stuff..
Oh, and a quickie :
When we print an address of a variable, is it the
virtual address or the physical one which is printed ?
printf("%04X", &i); /* Is virtual address of 'i'
printed or the physical one ?*/
Methinks it's the virtual address as from the page
table. Am I right ?
If you didn't get it, or think I am on dope, consider
this :
#include <stdio.h>
int main()
{
int i = 5, pid, count, *p = &i;
char choice[4] = {0};
printf("\ni = %d (%X)\n", i, &i);
printf("\nFork ?\n");
scanf("%s", choice);
if(choice[0] == 'y')
{
pid = fork();
if(pid < 0)
{
printf("\nfork() failed\n");
}
else if(pid == 0)
{
i = 6;
printf("\nChild : %d (%X)\n", i, &i);
}
else
{
printf("\n[1]Spawned child pid = %d, i = %d
(%X)\n", pid, i, &i);
wait(0);
printf("\n[2]Spawned child pid = %d, i = %d
(%X)\n", pid, i, &i);
printf("\nDone waiting for child\n");
}
printf("{%d} ", pid);
for(count = 0; count < 10; ++count, --p) printf("%x
", *p);
printf("\n{%d}i : %d (%X)\n", pid, i, &i);
}
return 0;
}
Look at it closely, and match it with the output. Who
can explain that to me ?
PS: Hmmm.. last few days, before trolling started
AGAIN, there was talk about a technically oriented
group starting up ?
I rolled my eyes then, but given the present scenario
of immense trolls/spam/whatnot filling up my mailbox,
maybe that was a better idea ?
Regards
Subhobroto Sinha
http://www.geocities.com/subhobrotosinha
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