#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <elf.h>
#include <stdlib.h>

extern char **environ;

int __captured_argc;
char **__captured_argv;
char **__captured_envp;
Elf64_auxv_t *__captured_auxv;

void _capture_args(int argc, char **argv, char **envp)
{
  __captured_argc = argc;
  __captured_argv = argv;
  __captured_envp = envp;

  while(*envp)
    envp++;

  __captured_auxv = (Elf64_auxv_t*)(envp + 1);
}

static void * initarray_entry __attribute__((section(".preinit_array"), used)) =
  (void*)_capture_args;

int main()
{
  printf("envp = %p\n", __captured_envp);

  for (int i = 0; __captured_auxv[i].a_type != AT_NULL; i++)
    {
      char *desc = "";
      if (__captured_auxv[i].a_type == AT_SYSINFO)
	desc = "AT_SYSINFO";
      else if (__captured_auxv[i].a_type == AT_SYSINFO_EHDR)
	desc = "AT_SYSINFO_EHDR";
      printf("aux type %02u = 0x%016lX %s\n",
	     __captured_auxv[i].a_type, (long)__captured_auxv[i].a_un.a_val,
	     desc);
    }
  return 0;
}