6263fda39b
I noticed that systemd-tty-password-agent would time out when asked to stop via SIGTERM, and eventually be killed, under some circumstances. It took me a while but i figured out what was going on: systemd-ask-pw-agent blocks SIGTERM because it wants async notifications on SIGTERM via signalfd() to listen on. That mostly works great: except for one case: if we actually get a pw query request, and hence need to acquire the terminal: we issue open_terminal() in that case, but if the terminal is used otherwsie we'll hang, and because SIGTERM is blocked we'll hang and cannot exit cleanly. Address that: optionally, in open_terminal() look for SIGTERM by unblcking the signal mask via ppoll() while we wait.
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