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package main
import (
"io"
"log"
"os"
"os/signal"
"syscall"
)
// setupStdin switches out stdin for a pipe. We do this so that we can
// close the writer end of the pipe when we receive an interrupt so plugins
// blocked on reading from stdin are unblocked.
func setupStdin() {
// Create the pipe and swap stdin for the reader end
r, w, _ := os.Pipe()
originalStdin := os.Stdin
os.Stdin = r
// Create a goroutine that copies data from the original stdin
// into the writer end of the pipe forever.
go func() {
defer w.Close()
io.Copy(w, originalStdin)
}()
// Register a signal handler for interrupt in order to close the
// writer end of our pipe so that readers get EOF downstream.
ch := make(chan os.Signal, 1)
signal.Notify(ch, os.Interrupt, syscall.SIGTERM)
go func() {
defer signal.Stop(ch)
defer w.Close()
<-ch
log.Println("Closing stdin because interrupt received.")
}()
}
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