程序工作流程（Linux）

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// glibc - start.c
static void
start1 (ARG_DUMMIES argc, argp)
     DECL_DUMMIES
     int argc;
     char *argp;
{
  char **argv = &argp;

  /* The environment starts just after ARGV.  */
  __environ = &argv[argc + 1];

  /* If the first thing after ARGV is the arguments
     themselves, there is no environment.  */
  if ((char *) __environ == *argv)
    /* The environment is empty.  Make __environ
       point at ARGV[ARGC], which is NULL.  */
    --__environ;

  /* Do C library initializations.  */
  __libc_init (argc, argv, __environ);

  /* Call the user program.  */
  exit (main (argc, argv, __environ));
}