Thread: Question related to getpid and getppid

Good evening,

i would like to ask you sthg related to finding the parent's id of a process.

I need my C program to output e.g. 48 : 47 --> - 34 --> - 2 --> - 0

where 48 is the id of the process,47 is the parent's id,-34 is the parent's id of the parent of the process etc.

I do :

Code:

#include <unistd.h>    
#include <sys/types.h>  
#include <errno.h>      
#include <stdio.h>      
#include <sys/wait.h>   
#include <stdlib.h>     

int main() {

printf("The process id is %d\n",getpid());
printf("The processes parent's id is %d\n",getppid());
 
}

What shall i do in order to output the parent's,parent id and the other ids?
Thanks,in advance!