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what is the meaning of ppid 1?

 
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# 1  
Old 08-02-2007
what is the meaning of ppid 1?
Is there any meaning on parent process id when it is equal = 1?
It is found that most of the ppid is lower than pid of the same process by 1
when perform ps -ef

but notice that some process's ppid is 1
# 2  
Old 08-02-2007
This may not be 100% correct, but most processes that have a ppid of 1 are the system processes that are started up, tty's and other things. You can also have this when you kill the parent and it still had some child process out there running. Like if you killed cron and it had jobs running, those running processes would have a 1 on them.
# 3  
Old 08-02-2007
Quote:
Originally Posted by darkrainbow
Is there any meaning on parent process id when it is equal = 1?
It is found that most of the ppid is lower than pid of the same process by 1
when perform ps -ef

but notice that some process's ppid is 1
ppid 1 indicates that the process is child of the process with pid 1 or the init process
pid = X ppid = 1
or
processes that have been adopted by the process 1 ( init )


Quote:
It is found that most of the ppid is lower than pid of the same process by 1
when perform ps -ef
there could be a case like this where this condition may not be true always
parent process with pid X
spawns a child process with pid Y

based on the system load and the allocation of pids to the process
there is a possibility that X > Y

but as you have said in most of the cases, it would be as
X < Y
 
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