Alarm signal and recv system call

I was surprised to find that Alarm signal do not abort recvVec function.
How is this possible?
I thought recv was always aborted on signal.


I use for test:

val _ = MLton.Signal.setHandler(Posix.Signal.alrm,
MLton.Signal.Handler.simple (fn _ => print "Alarm sig\n"))
val _ = Posix.Process.alarm (Time.fromSeconds (Int.toLarge 3))
val r = Socket.recvVec (socket, 1024)
val _ = print "Done\n"

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