Re: ldso: dlclose.

[boris brezillon <b.brezillon.musl@gmail.com>]

2012/8/24 Rich Felker <dalias@aerifal.cx>:
> On Fri, Aug 24, 2012 at 03:54:25PM +0200, musl wrote:
>> I was talking about this specific case :
>> 1) unloding a plugin
>> 2) updating the plugin (new plugin.so)
>> 3) reloading the plugin
>>
>> During the whole sequence the application is up and running.
>>
>> Here is how I should do it if dlclose is implemented per posix :
>> 1) stop the application
>> 2) update the plugin
>> 3) restart the application
>
> To clarify on "per POSIX", POSIX allows but does not require dlclose
> on the last reference to remove the library from the process's address
> space, but requires that this not happen if the library has been used
> to resolve undefined symbols.
>
>> The application is not available during this sequence.
>
> If the application just re-execs itself rather than exiting, there is
> no window during which it's unavailable. See how irssi handles the
> /upgrade command for an example. That might be the cleanest way to
> handle what you want to do.
>
This sounds interesting, I'll take a look.
> Rich