catch exit status of daemon

Yash Jain yash2learn at
Wed Jan 7 04:10:36 EST 2015

wait and waitpid would not work because a Process A would wait for process
B(which is a parent of the daemon), process B immediately exits and process
A would be notified.
In my case, I want to query the status of process C(which is child of
process B) / grandchild of process A which is a child of init after process
B terminates,

                  fork                            fork
process A -------------> Process B --------------> Process C

Process A should query the status of process C

Once process C is daemon, Process C would be the the child of init.

Can we do something by making a process A to be a daemon (child of init),
because process A and process C are sibling, can siblings query the status
of each other.

IPC is not an option for me, because there are several service and process
A do not know how and what is the process C, it should just monitor so many
child process.


On Wed, Jan 7, 2015 at 1:35 PM, Sudip Mukherjee <sudipm.mukherjee at>

> On Wed, Jan 7, 2015 at 12:57 AM, Nizam Haider <nizamhaider786 at>
> wrote:
> > Anuz Pratap Singh Tomar <chambilkethakur <at>> writes:
> >
> >>
> >>
> >>
> >> On Tue, Jan 6, 2015 at 3:22 PM, Yash Jain <yash2learn <at>>
> > wrote:Hello All,I have one dumb question,
> >> I wanted to write a process which monitors the exit status of the
> daemon,
> >>
> >> The Main process would fork a service, which would internally fork a
> child
> > and , exit from the process. If main process wants to query the status of
> > the daemon, how it can be achived.
> >>
> >> For ex :
> >> Process A would call a syslog service, which would internally fork a
> > child, daemon it and exit, so if process A wants to wait for the syslog
> > process, is it possible.
> >>
> >>
> >> waitpid()
> >>
> >> signal()
> doubt --
> wait and waitpid will be for the parent process to wait for its child.
> but for a daemon the parent is init .
> so the exit status should be sent to init and not to his process. then
> how does he get the exit status
> sudip
> >>
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