syslog-tee

#!/usr/bin/env ruby
# encoding: binary

STDOUT.sync = STDERR.sync = true

class LoggerExited < StandardError
end

trap "SIGCHLD" do
	raise LoggerExited
end

a, b = IO.pipe
b.sync = true

begin
	pid = fork do
		b.close
		STDIN.reopen(a)
		exec("logger", *ARGV)
	end
	a.close

	buf = ''
	while !STDIN.eof?
		STDIN.readpartial(1024, buf)
		STDOUT.write(buf)
		begin
			b.write(buf)
		rescue Errno::EPIPE
			break
		end
	end
	trap "SIGCHLD", "DEFAULT"
rescue LoggerExited
end

b.close
if pid
	begin
		Process.waitpid(pid)
		exit($?.exitstatus || 1)
	rescue Errno::ECHILD
		exit 1
	end
else
	exit 1
end