shl_load problem!

[jack_8]

I have a program.
file load_test.cpp:

#include
int main(int argc, char* const* argv)
{
void *libptr;
int (*proc)();
shl_t lib;
lib = shl_load("loader.sl", BIND_IMMEDIATE|BIND_VERBOSE, 0L);
int result = shl_findsym(&lib,(const char*) "LibMain", TYPE_PROCEDURE, (void*)&proc);
(*proc)();
shl_unload(lib);
return 0;
}
file loader.sl:

include

void bye();

extern "C" {

int LibMain()
{
atexit(bye);
return 1;
}

}

void bye()
{
}

Makefile is:
all: loader.sl load_test

load_test: Makefile load_test.cpp
aCC -o load_test load_test.cpp -ldld

loader.sl: Makefile loader.cpp
aCC +z -b -o $@ loader.cpp
===========================================
when I run load_test. I found it is core dump.
I don't know why? Is there any methods to solve it?

[jack_8]

sorry, forget to say enviroment. I use hp11.0 compiler is aCC 3.25.

[Sam Nicholls · Accepted solution]

Hi Jack,

The problem is that your atexit function (bye) is defined in the shared library. And you're unloading the shared library before the program exits. Thus the SEGV. Remove the shl_unload() or move bye() out of the shared library.

-sam

[Thomas Kollig]

Hi!

With "atexit" you register "bye" to be called at termination. If you unload your library, "bye" is gone and you get a segmentation fault
(You reference a function which doesn't exist any more).
If you don't unload your library or don't use "atexit" on "bye" it works fine.

Thomas