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I would like to find out if there is a
mechanism that would allow a shared
library to initialize itself upon
loading (not upon first call to
one of its ebtry points).

Any advice or pointers would be
greatly appreciated.


Thx,



dk

Dan Koren wrote:
> I would like to find out if there is a
> mechanism that would allow a shared
> library to initialize itself upon
> loading (not upon first call to
> one of its ebtry points).
>


> Any advice or pointers would be
> greatly appreciated.
>


You are after the initialization routine. See:

http://docs.sun.com/app/docs/doc/817...chapter2-48195


--chris

"Chris Gerhard" <Chris.Gerhard@remove_this.sun.com> wrote in message
news:ctqaov$p2q$1@new-usenet.uk.sun.com...
> Dan Koren wrote:
> > I would like to find out if there is a
> > mechanism that would allow a shared
> > library to initialize itself upon
> > loading (not upon first call to
> > one of its ebtry points).
>
> > Any advice or pointers would be
> > greatly appreciated.
>
> You are after the initialization routine. See:
>
> http://docs.sun.com/app/docs/doc/817...chapter2-48195
>


Thanks for the pointer.

This does not seem to be what I'm looking for however.

The examples on the page you pointed me to illustrate
init and fini routines that are invoked as a result of
running a program. What I'm looking for is a method of
loading and initializing a shared library upon loading,
regardless of any program being run that might use it
(and not waiting for this to happen).


Thx,



dk

"Dan Koren" <dankoren@yahoo.com> wrote in message
news:4200b449$1@news.meer.net...
> "Chris Gerhard" <Chris.Gerhard@remove_this.sun.com> wrote in message
> news:ctqaov$p2q$1@new-usenet.uk.sun.com...
> > Dan Koren wrote:
> > > I would like to find out if there is a
> > > mechanism that would allow a shared
> > > library to initialize itself upon
> > > loading (not upon first call to
> > > one of its ebtry points).
> >
> > > Any advice or pointers would be
> > > greatly appreciated.
> >
> > You are after the initialization routine. See:
> >
> >
http://docs.sun.com/app/docs/doc/817...chapter2-48195
> >
>
>
> Thanks for the pointer.
>
> This does not seem to be what I'm looking for however.
>
> The examples on the page you pointed me to illustrate
> init and fini routines that are invoked as a result of
> running a program. What I'm looking for is a method of
> loading and initializing a shared library upon loading,
> regardless of any program being run that might use it
> (and not waiting for this to happen).
>

I should have perhaps clarified that this would be used
as a system wide library to be loaded shortly after boot.
Think of it as a system wide LD_PRELOAD.

Thx,


dk

Dan Koren wrote:
> "Dan Koren" <dankoren@yahoo.com> wrote in message
> news:4200b449$1@news.meer.net...
>
>
> I should have perhaps clarified that this would be used
> as a system wide library to be loaded shortly after boot.
> Think of it as a system wide LD_PRELOAD.
>

Libraries only get loaded by processes and not by the system. If the
library needed some shared per system resource, like a shared memory
segment, it would have to be loaded by a process that then creates the
resource. That process could be started early in the boot via smf.

--chris

"Chris Gerhard" <Chris.Gerhard@remove_this.sun.com> wrote in message
news:ctqd3p$pq8$1@new-usenet.uk.sun.com...
> Dan Koren wrote:
> > "Dan Koren" <dankoren@yahoo.com> wrote in message
> > news:4200b449$1@news.meer.net...
> >
> >
> > I should have perhaps clarified that this would be used
> > as a system wide library to be loaded shortly after boot.
> > Think of it as a system wide LD_PRELOAD.
>
> Libraries only get loaded by processes and not by the system.
> If the library needed some shared per system resource, like a
> shared memory segment, it would have to be loaded by a process
> that then creates the resource. That process could be started
> early in the boot via smf.
>


Thanks for the clarification. Unfortunately, this is not what
I am looking for. I need the ability to load a shared library
*before* any user processes start running.

I suppose I will have to write a driver to accomplish this.


dk

"Dan Koren" <dankoren@yahoo.com> writes:

>> http://docs.sun.com/app/docs/doc/817...chapter2-48195

>Thanks for the pointer.

>This does not seem to be what I'm looking for however.

It is.

>The examples on the page you pointed me to illustrate
>init and fini routines that are invoked as a result of
>running a program. What I'm looking for is a method of
>loading and initializing a shared library upon loading,
>regardless of any program being run that might use it
>(and not waiting for this to happen).

Using init and fini routines inside a library will have the
same effect; they are executed when the library is first loaded,
just like the methods in the examples are executed when the
program is loaded.

Casper
--
Expressed in this posting are my opinions. They are in no way related
to opinions held by my employer, Sun Microsystems.
Statements on Sun products included here are not gospel and may
be fiction rather than truth.

"Dan Koren" <dankoren@yahoo.com> writes:

>I should have perhaps clarified that this would be used
>as a system wide library to be loaded shortly after boot.
>Think of it as a system wide LD_PRELOAD.

Libraries are loaded into progams; they are not loaded into
the system; of course, if you do a system wide LD_PRELOAD, then
that would mean that the library is loaded in all programs.

The init methods will be executed immediately on loading.

Casper
--
Expressed in this posting are my opinions. They are in no way related
to opinions held by my employer, Sun Microsystems.
Statements on Sun products included here are not gospel and may
be fiction rather than truth.

"Dan Koren" <dankoren@yahoo.com> writes:

>Thanks for the clarification. Unfortunately, this is not what
>I am looking for. I need the ability to load a shared library
>*before* any user processes start running.

You cannot load a shared library except in a process, so
this makes no sense.

>I suppose I will have to write a driver to accomplish this.

Quite; what is it that you wish to accomplish with this shared
library or driver?

Casper
--
Expressed in this posting are my opinions. They are in no way related
to opinions held by my employer, Sun Microsystems.
Statements on Sun products included here are not gospel and may
be fiction rather than truth.

"Casper H.S. Dik" <Casper.Dik@Sun.COM> wrote in message
news:4200c27c$0$28983$e4fe514c@news.xs4all.nl...
> "Dan Koren" <dankoren@yahoo.com> writes:
>
> >Thanks for the clarification. Unfortunately, this is not what
> >I am looking for. I need the ability to load a shared library
> >*before* any user processes start running.
>
> You cannot load a shared library except in a
> process, so this makes no sense.


Only if one follows the textbooks ;-)


> > I suppose I will have to write a driver to
> > accomplish this.
>
> Quite; what is it that you wish to accomplish
> with this shared library or driver?


The picture from 1,000,000 ft is simply that I
need a library that performs some magic tricks
to be present and active in every context before
any user level process starts running, so it can
intercept the loading of any text file in the
system, and instrument it in a certain fashion.

It would be a little complicated, and possibly
inappropriate, to discuss the details in a
public forum. If you are interested in the
details of this project, I would be happy
to elaborate in private e-mail.

Many thanks for your (and everyone's) help.



dk