08-20-2008
Your question was a bit vague, so forgive me if this does not answer your question.
Usually, the background process does not (not should not) have a controlling TTY. If it does, it is because the parent process did not close all TTY-open file descriptors (such as stderr and stdin) after the fork() and before the exec().
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LEARN ABOUT POSIX
systemd-tty-ask-password-agent
SYSTEMD-TTY-ASK-PASSWORD-AGENT(1) systemd-tty-ask-password-agent SYSTEMD-TTY-ASK-PASSWORD-AGENT(1)
NAME
systemd-tty-ask-password-agent - List or process pending systemd password requests
SYNOPSIS
systemd-tty-ask-password-agent [OPTIONS...] [VARIABLE=VALUE...]
DESCRIPTION
systemd-tty-ask-password-agent is a password agent that handles password requests of the system, for example for hard disk encryption
passwords or SSL certificate passwords that need to be queried at boot-time or during runtime.
systemd-tty-ask-password-agent implements the Password Agents Specification[1], and is one of many possible response agents which answer to
queries formulated with systemd-ask-password(1).
OPTIONS
The following options are understood:
--list
Lists all currently pending system password requests.
--query
Process all currently pending system password requests by querying the user on the calling TTY.
--watch
Continuously process password requests.
--wall
Forward password requests to wall(1) instead of querying the user on the calling TTY.
--plymouth
Ask question with plymouth(8) instead of querying the user on the calling TTY.
--console
Ask question on /dev/console instead of querying the user on the calling TTY.
-h, --help
Print a short help text and exit.
--version
Print a short version string and exit.
EXIT STATUS
On success, 0 is returned, a non-zero failure code otherwise.
SEE ALSO
systemd(1), systemctl(1), systemd-ask-password-console.service(8), wall(1), plymouth(8)
NOTES
1. Password Agents Specification
https://www.freedesktop.org/wiki/Software/systemd/PasswordAgents
systemd 237 SYSTEMD-TTY-ASK-PASSWORD-AGENT(1)