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Old 02-03-2005, 09:14 AM   #1
Registered: Feb 2004
Posts: 96

Rep: Reputation: 15
how to use clone()

I read man about clone(), and write a little program as follow:
#include <sched.h>
#include <stdio.h>

int fn(void *p)
int i=0;
return i;

char stack[30];

int main()
int i=0;
i=clone(fn , (void *)stack , CLONE_FS , NULL);

printf("%d" , i);
But it can not run correctly. The program can not print anything at all.
How to use clone()?
Old 02-03-2005, 12:19 PM   #2
LQ Newbie
Registered: Oct 2004
Location: India
Distribution: Suse 9.1
Posts: 29

Rep: Reputation: 15
I modified ur code a bit & it worked:

Here is the complete code:
#include <sched.h>
#include <stdio.h>

int fn()
int i=0;
printf("in fn\n");
return (i);

int main()
char stack[30];
int i;
i=clone(fn , stack , CLONE_FS , NULL);

printf("i = %d\n" , i);

the output given was :
in fn
i = 7102

where i is the pid of the child process that was executing fn,; The mistake u were makink was the u were typecasting stack as void *. If u read Programming Principles by Pratt then u'll find that void* will confuse the compiler. I had run the code using gcc.


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