Daniel Foster c7a444a9c1 tree-wide: extend $LISTEN_FDS protocol with $LISTEN_PIDFDID ...

Although extremely unlikely, there is a race present in solely checking the
$LISTEN_PID environment variable, due to PID recycling. Fix that by introducing
$LISTEN_PIDFDID, which contains the 64-bit ID of a pidfd for the child process
that is not subject to recycling.

2025-10-22 09:34:14 +02:00

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