Re: dynamic libraries: custom _init() without losing default _init()

[matze <matze at indymedia dot org>]

El Wed, Mar 30, 2005 at 01:05:26AM +0400 Zagorodnev, Grigory ha dit:

> >to initialize the dynamic library a custom _init() is called. is it
> >possible to call default _init() from the custom one or is there
> >another way to invoke a custom function from default _init() or
> >directly afterwards?
> 
> It would be safer to not override default startup code, but use one of
> the following:
> 
> Once your code is C++ you can create file-scope instance of some
> initialization class so its constructor will do the work. This is most
> portable approach.
> 
> In case library initialization code must be executed _before_ any C++
> object constructor, you may use ".preinit_array"
> 	static preinit(int argc, char *argv[]);
> 	static void (*const preinit_ptr) (int argc, char *argv[])
> 	     __attribute__ ((section (".preinit_array"))) = &preinit;

thanks for your answer grigory, if that works it's actually cook :)

i tried it, but the linker complains about the following:

matze@assata:/tmp$ g++ -shared foo.cpp -o foo.so
/usr/bin/ld: /tmp/cc1zrrRc.o: .preinit_array section is not allowed in
DSO

any idea?

matze

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