Queries the entropy gathering daemon EGD on socket path given by
filename.
Fetches length number of bytes and uses ::add to seed the OpenSSL built-in PRNG.
static VALUE
ossl_rand_egd_bytes(VALUE self, VALUE filename, VALUE len)
{
int n = NUM2INT(len);
rb_check_safe_obj(filename);
if (RAND_egd_bytes(StringValueCStr(filename), n) == -1) {
ossl_raise(eRandomError, NULL);
}
return Qtrue;
}