faults in dynamic libraries

faults in dynamic libraries

[Tver Mit]

Hi all.
I write a programm that uses plugins (on dl* functions base). When plugin code is free of
bugs all is ok, but when plugin faults by any reason, my programm do so. I want my programm
to work even if plugin dies. I see two ways: 
1. handling signals 
2. run plugin in different thread or process
but then: 
in 1. what will be with resources, that plugin use ? 
in 2. it'll be about 15-20 plugins running - so there will be 15-20 processes. And how to synchronise them all?

Got any ideas, opinions?

________________
Good hunt.

 Tver                          mailto:Vukdev@mail.ru

Re: faults in dynamic libraries

[Glynn Clements]

Tver Mit wrote:

> I write a programm that uses plugins (on dl* functions base). When plugin code is free of
> bugs all is ok, but when plugin faults by any reason, my programm do so. I want my programm
> to work even if plugin dies. I see two ways: 
> 1. handling signals 
> 2. run plugin in different thread or process
> but then: 
> in 1. what will be with resources, that plugin use ? 
> in 2. it'll be about 15-20 plugins running - so there will be 15-20 processes. And how to synchronise them all?
> 
> Got any ideas, opinions?

If a plugin shares its address space with the main program, a bug can
corrupt that address space, killing the main program.

Running plugins in a separate process is the only reliable mechanism,
but it probably isn't practical. Even then, a plugin may still be able
to interfere with the main process if they share system resources such
as file descriptors.

-- 
Glynn Clements <glynn.clements@virgin.net>

Re: faults in dynamic libraries

[jnf]

not much better, but if one created a plugin manager type process that dealt with them all, it would keep the main process from dying if a plugin died? 

--- Glynn Clements <glynn.clements@virgin.net> wrote:
>
>Tver Mit wrote:
>
>> I write a programm that uses plugins (on dl* functions base). When plugin code is free of
>> bugs all is ok, but when plugin faults by any reason, my programm do so. I want my programm
>> to work even if plugin dies. I see two ways: 
>> 1. handling signals 
>> 2. run plugin in different thread or process
>> but then: 
>> in 1. what will be with resources, that plugin use ? 
>> in 2. it'll be about 15-20 plugins running - so there will be 15-20 processes. And how to synchronise them all?
>> 
>> Got any ideas, opinions?
>
>If a plugin shares its address space with the main program, a bug can
>corrupt that address space, killing the main program.
>
>Running plugins in a separate process is the only reliable mechanism,
>but it probably isn't practical. Even then, a plugin may still be able
>to interfere with the main process if they share system resources such
>as file descriptors.
>
>-- 
>Glynn Clements <glynn.clements@virgin.net>
>-
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