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The Linux kernel configuration item CONFIG_KEY_NOTIFICATIONS
:
CONFIG_KEYS && CONFIG_WATCH_QUEUE
This option provides support for getting change notifications on keys and keyrings on which the caller has View permission. This makes use of the /dev/watch_queue misc device to handle the notification buffer and provides KEYCTL_WATCH_KEY to enable/disable watches.
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Automatically generated (in year 2021). See also LKDDb sources on GitLab