g++ suspend.cpp -fPIC -m32 -shared -dl -o suspend.so

Suspend Linux program at start with LD_PRELOAD

#include <stdio.h>
#include <dlfcn.h>

#define VISIBLE __attribute__((visibility("default")))

using void_fn = void(*)(void);
using main_fn = int(*)(int, char**, char**);

extern "C" VISIBLE int __libc_start_main(main_fn main, int argc, char** argv, main_fn init, void_fn fini, void_fn rtld_fini, void* stack_end) {
	static auto o_libc_start_main = reinterpret_cast<decltype(&__libc_start_main)>(dlsym(RTLD_NEXT, "__libc_start_main"));

	printf("Press ENTER to start the program.\n");
	getchar();

	return o_libc_start_main(main, argc, argv, init, fini, rtld_fini, stack_end);
}