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I'm just beginning to dive into the internals of Linux, and I was wondering what the difference is between udev and the hal daemon. From what I gather, both seem to be responsible for managing hot pluggable devices... is hald used by udev to listen, or are they two separate things?

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I could be wrong, but I think udev is newer and trying to take over. See the wikipedia entries on them. –  Kevin Nov 2 '11 at 0:16

2 Answers 2

One important difference is that HAL is deprecated.

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hald is responsible for providing a unified interface to the current hardware configuration of the machine. udev is responsible for managing the various operations required when the hardware configuration changes while the system is live.

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From hal-spec: HAL can notify other peers on the message-bus when devices are added and removed as well as when properties on a device are changing. –  Shawn J. Goff Nov 2 '11 at 1:43

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