|
12-18-2006, 09:25 AM
| #1 |
| Registered User Join Date: Dec 2006
Posts: 81
| Question related to getpid and getppid 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());
}
Thanks,in advance!  |
| g_p is offline |  |
|
12-18-2006, 09:33 AM
| #2 |
| +++ OK NO CARRIER  Join Date: Oct 2001
Posts: 10,640
| Use a pipe and when you fork, pass it to the child. Quzah.
__________________ Hundreds of thousands of dipshits can't be wrong. Are you up for the suck? |
| quzah is offline | |
|
12-18-2006, 09:40 AM
| #3 |
| Registered User Join Date: Dec 2006
Posts: 81
| Well,can't i use some other function like getpid and getppid in order to output the desirable result? |
| g_p is offline | |
|
12-18-2006, 10:11 AM
| #4 |
| . Join Date: Nov 2003
Posts: 293
| Are you trying to trace "parentage" back possibly to init (modern UNIX init has pid=1)? Or maybe as far as possible... getpid and getppid work only in the context of the current process. You can't run them in your process and get the values for some other process. Sorry if I don't get you requirement. quzah's advice works great when you are going down to children and "grand"children. |
| jim mcnamara is offline | |
|
12-18-2006, 11:35 AM
| #5 |
| and the hat of Jobseeking  Join Date: Aug 2001 Location: The edge of the known universe
Posts: 21,688
| Parsing the output of the "ps" command is about the only easy way of figuring out what all the process IDs are. And how come you're outputting negative PIDs? |
| Salem is offline | |
 |
| Thread Tools | |
| Display Modes | |
|
Linear Mode
