Added fd_add method for uloop lua binding.

Use uloop.fd_add like this:

    local socket = require "socket"

    udp = socket.udp()

    uloop.fd_add(
        udp, -- socket
        function( -- callback function
            ufd,    -- socket object when register the fd
            events  -- uloop events. eg. uloop.ULOOP_READ .
        )
            local words, msg_or_ip, port_or_nil = ufd:receivefrom()
            print('Recv UDP packet from '..msg_or_ip..':'..port_or_nil..' : '..words)
        end,
        uloop.ULOOP_READ -- event you want to listen
    )

The `examples/uloop-example.lua` show an example of this work.

Signed-off-by: Xiongfei(Alex) Guo <xfguo@credosemi.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/examples/uloop-example.lua b/examples/uloop-example.lua
index 2da6ebd..ba34ec5 100755
--- a/examples/uloop-example.lua
+++ b/examples/uloop-example.lua
@@ -1,8 +1,14 @@
 #!/usr/bin/env lua
 
+local socket = require "socket"
+
 local uloop = require("uloop")
 uloop.init()
 
+local udp = socket.udp()
+udp:settimeout(0)
+udp:setsockname('*', 8080)
+
 -- timer example 1
 local timer
 function t()
@@ -40,5 +46,22 @@ uloop.timer(
 	end, 2000
 )
 
+uloop.fd_add(udp, function(ufd, events)
+	local words, msg_or_ip, port_or_nil = ufd:receivefrom()
+	print('Recv UDP packet from '..msg_or_ip..':'..port_or_nil..' : '..words)
+end, uloop.ULOOP_READ)
+
+udp_send_timer = uloop.timer(
+	function()
+		local s = socket.udp()
+		local words = 'Hello!'
+		print('Send UDP packet to 127.0.0.1:8080 :'..words)
+		s:sendto(words, '127.0.0.1', 8080)
+		s:close()
+
+		udp_send_timer:set(1000)
+	end, 3000
+)
+
 uloop.run()