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Top Forums UNIX for Advanced & Expert Users Finding process id of subsequent process Post 302368275 by matrixmadhan on Thursday 5th of November 2009 12:57:50 AM
Old 11-05-2009
Quote:
Originally Posted by thmnetwork
Unless you expect the first script to finish within a second or two, frans's solution is fine.
That needed not be the case, and the solution that am trying for is some generic solution

Quote:
Also, if you added a lock file that gets deleted when the process ends, can't you use the same script that creates the lock file to create it with the pid in the lock file's name?
A lock file with pid in it isn't really making any difference here, just a running number to keep track of the active child count should do and that is what i had done for now

Quote:
Alternative concepts could be to have envVarSetter write the pid of the child and any other useful info to its parent process's read pipe.

Alternatively, you could look through children of init for processes of that name that began a within a second or two of the script's initial running.

etc, etc. There are a lot of possibilities.
Again an important point is being missed out here,
say at t1 the main script spawns a process p1 and is adopted by init at the same time t1, another script with the same name can be spawned and become the child of the init

In a busy node, all these considerations should be dealt well, else there would be confusion as to who is the parent of whom

-- many thanks for the suggestions

---------- Post updated 11-05-09 at 11:27 AM ---------- Previous update was 11-04-09 at 11:34 PM ----------

Now I have an improved way to prevent the hack of spoofing child creation instance by adding new files at least to an extent.

Instead of writing the active child number spawned, write a random number to the file and maintain that in an internal hash. When checking for the existence of file as a synonym that is indicating whether a process is running or not, search for the entry in the file and compare it against the internal hash that is built with this values. With this, spoof of child creating by just touching files can be avoided.

I don't want to write the pid because effectively we are writing the PPID and not PID which should be avoided.
 

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TAPSET::KPROCESS(3stap) 												   TAPSET::KPROCESS(3stap)

NAME
tapset::kprocess - systemtap kernel process probe points DESCRIPTION
This family of probe points is used to probe the kernel's process activities. It contains the following probe points: kprocess.create Fires whenever a new process is successfully created, either as a result of one of the fork syscall variants, or a new kernel thread. Arguments: task a handle to the newly created process new_pid pid of the newly created process kprocess.start Fires immediately before a new process begins execution. Arguments: N/A kprocess.exec Fires whenever a process attempts to exec to a new program Arguments: filename the path to the new executable kprocess.exec_complete Fires at the completion of an exec call Arguments: errno the error number resulting from the exec success a boolean indicating whether the exec was successful kprocess.exit Fires when a process terminates. This will always be followed by a kprocess.release, though the latter may be delayed if the process waits in a zombie state. Arguments: code the exit code of the process kprocess.release Fires when a process is released from the kernel. This always follows a kprocess.exit, though it may be delayed somewhat if the process waits in a zombie state. Arguments: task a task handle to the process being released pid pid of the process being released SEE ALSO
stap(1), stapprobes(3stap) Intel, IBM TAPSET::KPROCESS(3stap)
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