39 lines
983 B
Fennel
39 lines
983 B
Fennel
(local netlink (require :netlink))
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(local sock (netlink.socket))
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(when (< (# arg) 2)
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(print "usage: waitup ifname fd")
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(os.exit 1))
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(local ifname (. arg 1))
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(local fd (tonumber (. arg 2)))
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(local stream (io.open (.. "/proc/self/fd/" fd) "w"))
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(fn notify-ready []
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(when (= "file" (io.type stream))
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(stream:write "\n")
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(stream:close))
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(print (.. (. arg 0) ": received netlink operstate up for " ifname)))
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(fn run-events [evs]
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(each [_ v (ipairs evs)]
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(print :event v.event v.name)
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(match v
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;; - up: Reflects the administrative state of the interface (IFF_UP)
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;; - running: Reflects the operational state (IFF_RUNNING).
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{:event "newlink" :name ifname :up :yes :running :yes}
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(notify-ready)
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{:event "newlink" :name ifname :up :no}
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(os.exit 0))))
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(run-events (sock:query {:link true}))
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(print (.. (. arg 0) ": waiting for netlink NEWLINK " ifname))
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(while (sock:poll)
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(let [ev (sock:event)]
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(run-events ev)))
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