void Foo();
void Bar();

void Foo()
{
	cout << "Foo()\n";
}

void Bar()
{
	cout << "Bar()\n";
}

int main()
{
	// open module
	void *module = dlopen("./hello.so", RTLD_LAZY);
	if(!module)
 	{
		cerr << "error in open: " << dlerror() << "\n";
		exit(-1);
	}

	// can this next 4 lines be done in a simpler way?
	typedef void (*Function)();
	Function function;

	void *pointer = dlsym(module, "hello");
	function = *reinterpret_cast<Function*>(&pointer);

	// check for errors
	const char *error = dlerror();
	if(error)
	{
		cerr << "fatal error: " << error << "\n";
		exit(-1);
	}

	// call the function
	function();

	// close the module
	dlclose(module);

	return 0;
}

#include <iostream>
using namespace std;

void Foo();

extern "C"
{

// i think this needs to be wrapped in extern "C"
void hello()
{
	cout << "hello\n";
	Foo();
}

}

genjix@linux:~/media/tmp/obj/dl> ./a.out
error in open: ./hello.so: undefined symbol: _Z3Foov

genjix@linux:~/media/tmp/obj/dl> echo -en "[hello.so]\n\n" > log && nm hello.so>> loggenjix@linux:~/media/tmp/obj/dl> echo -en "[a.out]\n\n" >> log && nm a.out >> log

[hello.so]00001b50 A __bss_start00000780 t call_gmon_start00001b50 b completed.100001a2c d __CTOR_END__00001a24 d __CTOR_LIST__         U __cxa_atexit@@GLIBC_2.1.3         w __cxa_finalize@@GLIBC_2.1.300000920 t __do_global_ctors_aux000007b0 t __do_global_dtors_aux00001b44 d __dso_handle00001a34 d __DTOR_END__00001a30 d __DTOR_LIST__00001a3c A _DYNAMIC00001b50 A _edata00001b58 A _end00000954 T _fini00000820 t frame_dummy00000a20 r __FRAME_END__00000904 t _GLOBAL__I_x00001b30 A _GLOBAL_OFFSET_TABLE_         w __gmon_start__         U __gxx_personality_v0@@CXXABI_1.200000868 T hello0000072c T _init00001a38 d __JCR_END__00001a38 d __JCR_LIST__         w _Jv_RegisterClasses00001b48 d p.0000008ec t __tcf_000001b4c D x         U _Z3Foov000008ae t _Z41__static_initialization_and_destruction_0ii         U _ZNSolsEi@@GLIBCPP_3.20000097c V _ZNSt15basic_streambufIcSt11char_traitsIcEE13_S_pback_sizeE00000980 V _ZNSt15basic_streambufIwSt11char_traitsIwEE13_S_pback_sizeE         U _ZNSt8ios_base4InitC1Ev@@GLIBCPP_3.2         U _ZNSt8ios_base4InitD1Ev@@GLIBCPP_3.2         U _ZSt4cout@@GLIBCPP_3.200001b54 b _ZSt8__ioinit         U _ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc@@GLIBCPP_3.2[a.out]08049d94 A __bss_start08048784 t call_gmon_start08049eb4 b completed.108049c54 d __CTOR_END__08049c4c d __CTOR_LIST__         U __cxa_atexit@@GLIBC_2.1.308049d88 D __data_start08049d88 W data_start         U dlclose@@GLIBC_2.0         U dlerror@@GLIBC_2.0         U dlopen@@GLIBC_2.1         U dlsym@@GLIBC_2.008048aa0 t __do_global_ctors_aux080487b0 t __do_global_dtors_aux08049d8c D __dso_handle08049c5c d __DTOR_END__08049c58 d __DTOR_LIST__08049c64 D _DYNAMIC08049d94 A _edata08049ebc A _end         U exit@@GLIBC_2.008048ac4 T _fini08049c4c A __fini_array_end08049c4c A __fini_array_start08048ae0 R _fp_hw080487f0 t frame_dummy08048c48 r __FRAME_END__080489b4 t _GLOBAL__I__Z3Foov08049d50 D _GLOBAL_OFFSET_TABLE_         w __gmon_start__         U __gxx_personality_v0@@CXXABI_1.208048a98 T __i686.get_pc_thunk.bx0804867c T _init08049c4c A __init_array_end08049c4c A __init_array_start08048ae4 R _IO_stdin_used08049c60 d __JCR_END__08049c60 d __JCR_LIST__         w _Jv_RegisterClasses080489d0 T __libc_csu_fini08048a40 T __libc_csu_init         U __libc_start_main@@GLIBC_2.008048858 T main08049d90 d p.008048760 T _start0804899c t __tcf_00804883a T _Z3Barv0804881c T _Z3Foov0804895e t _Z41__static_initialization_and_destruction_0ii08048b28 V _ZNSt15basic_streambufIcSt11char_traitsIcEE13_S_pback_sizeE08048b2c V _ZNSt15basic_streambufIwSt11char_traitsIwEE13_S_pback_sizeE         U _ZNSt8ios_base4InitC1Ev@@GLIBCPP_3.2         U _ZNSt8ios_base4InitD1Ev@@GLIBCPP_3.208049e28 B _ZSt4cerr@@GLIBCPP_3.208049d98 B _ZSt4cout@@GLIBCPP_3.208049eb8 b _ZSt8__ioinit         U _ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc@@GLIBCPP_3.2