On 12.01.2011 22:58, Izak Burger wrote:
Hi all,
I've been studying the embedded C code used by the geoip plugin and
noticed how dlopen is used to load this functionality by declaring a
load_module procedure. What I cannot seem to figure out is where and
how this is called (grep is not my friend tonight), so at present it
seems almost like magic (or more likely, a level of indirection I'm
missing). Can anyone enlighten me?
__attribute__((constructor)) void
load_module()
First line causes this function to be executed at library load (or
before main when used in programs).
Also, is there an unload_module or similar partner procedure that one
can define for cleanup purposes?
There also is destructor which is called on library unload (after main).
Some more info on gcc attributes:
http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
--
Łukasz Barszcz
web architect
Pion Aplikacji Internetowych
GG Network S.A http://www.gadu-gadu.pl
ul. Kamionkowska 45 03-812 Warszawa
tel.: +48 22 4277900 fax.: +48 22 5146498 gg:16210
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