Albert - namccart/201507_codesprint GitHub Wiki

#include <iostream>
#include <dirent.h> //directory listing routines
#include <dlfcn.h>  //library linking routines

using namespace std;

int main(int argc, char **argv) {
	//set up vars
	DIR *dp;
	struct dirent *dir_s;
	string dir = "./apps-lib";

	//attempt to open directory
	cout << " Searching apps path: " << dir << endl;
	dp = opendir( dir.c_str() );
	if(dp == NULL){
		cout << " -Application directory not found." << endl;
		return -1;
	}


	//browse through files
	while ((dir_s = readdir(dp)) != NULL) {
		if( dir_s->d_type != 0x8 ) continue;
		cout << "\n  -File found: " << dir_s->d_name << endl;
		string file = dir + "/" + dir_s->d_name;


		//attempt to load as a library
		void *p_lib;
		p_lib = dlopen( file.c_str(), RTLD_LAZY );
		if ( p_lib == NULL){
			cout << "  - Not a valid lib." << endl;
			continue;
		}
		cout << "  - File opened as library." << endl;


		//look for our entry point of interest
		void (*p_fn)(void);
		*(void **)(&p_fn) = dlsym(p_lib, "gc_register");
		if(p_fn == NULL){
			cout << "  - Not a valid lib. Registration procedure not found." << endl;
			dlclose(p_lib);
			continue;
		}

		//register your library
		(*p_fn)();

		if(p_lib) dlclose(p_lib);
	}


	if(dp) closedir(dp);

	return 0;
}

#ifndef COMMON_APP_HH
#define COMMON_APP_HH

#ifdef __cplusplus
extern "C"{
#endif

void gc_register(void);


#ifdef __cplusplus
}
#endif


#endif //COMMON_APP_HH

#include "common_app.hh"
#include <iostream>


void gc_register(void)
{
	std::cout << "...LIB INTERNAL LTE_APP REGISTRATION..." << std::endl;
}