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@pid_full = '/tmp/my_daemon.pid' | |
def run | |
EM.run{ | |
Signal.trap('INT') { stop } | |
Signal.trap('TERM'){ stop } | |
# your daemon code runs here. This will not exit since it is running in EM | |
} | |
end | |
def get_pid | |
if File.exists?(@pid_full) | |
file = File.new(@pid_full, "r") | |
pid = file.read | |
file.close | |
pid | |
else | |
0 | |
end | |
end | |
def start | |
pid = get_pid | |
if pid != 0 | |
warn "Daemon is already running" | |
exit -1 | |
end | |
pid = fork { | |
run | |
} | |
begin | |
file = File.new(@pid_full, "w") | |
file.write(pid) | |
file.close | |
Process.detach(pid) | |
rescue => exc | |
Process.kill('TERM', pid) | |
warn "Cannot start daemon: #{exc.message}" | |
end | |
end | |
def stop | |
pid = get_pid | |
begin | |
EM.stop | |
rescue | |
end | |
if pid != 0 | |
Process.kill('HUP', pid.to_i) | |
File.delete(@pid_full) | |
puts "Stopped" | |
else | |
warn "Daemon is not running" | |
exit -1 | |
end | |
end |
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