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Full Discussion: Finding process id of subsequent process
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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LEARN ABOUT HPUX

setsid

setsid(2)							System Calls Manual							 setsid(2)

NAME

       setsid - create session and set process group ID

SYNOPSIS

DESCRIPTION

       If  the	calling  process is not a process group leader, creates a new session.	The calling process becomes the session leader of this new
       session, it becomes the process group leader of a new process group, and it has no controlling terminal.  The process group ID of the call-
       ing  process  is  set equal to the process ID of the calling process.  The calling process is the only process in the new process group and
       the only process in the new session.

   Security Restrictions
       Some or all of the actions associated with this system call may require privileges.  See privileges(5) for more information.

RETURN VALUE

       Upon successful completion, returns the value of the new process group ID of the calling process.  Otherwise, it returns  a  value  of  and
       sets to indicate the error.

ERRORS

       If fails, no changes occur and (see errno(2)) is set to one of the following values:

	      The calling process is already a process group leader, or
			     the process group ID of a process other than the calling process matches the process ID of the calling process.

	      The calling process does not have sufficient privileges.

AUTHOR

       was developed by HP and AT&T.

SEE ALSO

       exec(2), exit(2), fork(2), getpid(2), kill(2), setpgid(2), setpgrp(2), setpgrp3(2), signal(2), privileges(5), termio(7).

STANDARDS CONFORMANCE

																	 setsid(2)
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