RPP_REQUIRE_TTY
if (flags & RPP_REQUIRE_TTY) {
rppflags |= RPP_REQUIRE_TTY;
if (readpassphrase(prompt, pw, sizeof(pw), RPP_REQUIRE_TTY) == NULL)
passbuf, passbufsize, RPP_ECHO_OFF | RPP_REQUIRE_TTY);
RPP_ECHO_OFF | RPP_REQUIRE_TTY);
if (flags & RPP_REQUIRE_TTY) {