myuser has asked for the wisdom of the Perl Monks concerning the following question:

I guess it is not possible..

But does somebody knows a way of getting the values of environment from a child process to a parent process ?

Or some workaround to do the same ?
  • Comment on what is the method to get the environment from child process ?

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Re: what is the method to get the environment from child process ?
by ikegami (Patriarch) on Nov 10, 2010 at 05:57 UTC
    Via a pipe would be an obvious choice. Practically any means of transferring data from the child to the parent could be used to transmit environment variables.
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Re: what is the method to get the environment from child process ?
by eyepopslikeamosquito (Archbishop) on Nov 10, 2010 at 09:35 UTC

    This looks like an XY Problem.

    Give us some context of the real problem you are trying to solve and what alternatives you have considered.

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Re: what is the method to get the environment from child process ?
by Tux (Canon) on Nov 10, 2010 at 06:52 UTC

    When you are running on an OS that has/supports the proc filesystem, you could read /proc/$pid/environ, but I'm not sure if that is (always) updated if the environment changes for the (sub)process, or that it just reflects the environment at startup. YMMV.


    Enjoy, Have FUN! H.Merijn
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[d/l]
Re: what is the method to get the environment from child process ?
by cdarke (Prior) on Nov 10, 2010 at 09:14 UTC
    Only using an IPC mechanism, see perlipc. The environment block in the child is only a copy of that in the parent. Well usually it is a copy, actually the parent can supply a totally different block for the child (on UNIX and Windows).
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Re: what is the method to get the environment from child process ?
by BrowserUk (Patriarch) on Nov 10, 2010 at 06:11 UTC
    I guess it is not possible.. But does somebody knows a way of getting the values of environment from a child process to a parent process ?

    Do you perhaps mean "Set environment variables within the parent (shell) process from a child (perl) process?"

    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.
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      Setting environment in child (perl )process, and getting it in parent ( perl ) process.

      Forking a child perl process from parent perl process.
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        Setting environment in child (perl )process, and getting it in parent ( perl ) process. Forking a child perl process from parent perl process.

        You are suggesting using environment vars as an IPC mechanism?

        If so, I don't believe that is possible on any multi-tasking OS.

        Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
        "Science is about questioning the status quo. Questioning authority".
        In the absence of evidence, opinion is indistinguishable from prejudice.
[reply]

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