Ami Chayun wrote:
Hi all,
I have a shared library, and I want a specific function to be called once the
library is loaded.
Dlls has the notorious DllMain function. Is there a method of achieving the
same in an .so file?
5.2. Library constructor and destructor functions
Libraries should export initialization and cleanup routines using the gcc __attribute__((constructor)) and
__attribute__((destructor)) function attributes. See the gcc info pages for information on these. Constructor routines
are executed before dlopen returns (or before main() is started if the library is loaded at load time). Destructor
routines are executed before dlclose returns (or after exit() or completion of main() if the library is loaded at load
time). The C prototypes for these functions are:
void __attribute__ ((constructor)) my_init(void);
void __attribute__ ((destructor)) my_fini(void);
Shared libraries must not be compiled with the gcc arguments ``-nostartfiles'' or ``-nostdlib''. If those arguments are
used, the constructor/destructor routines will not be executed (unless special measures are taken).
http://www.faqs.org/docs/Linux-HOWTO/Program-Library-HOWTO.html#INIT-AND-CLEANUP
--
Gilad Ben-Yossef <[EMAIL PROTECTED]>
Codefidence. A name you can trust(tm)
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