uloop-example.lua

  1 #!/usr/bin/env lua
  2 
  3 local socket = require "socket"
  4 
  5 local uloop = require("uloop")
  6 uloop.init()
  7 
  8 local udp = socket.udp()
  9 udp:settimeout(0)
 10 udp:setsockname('*', 8080)
 11 
 12 -- timer example 1 (will run repeatedly)
 13 local timer
 14 function t()
 15         print("1000 ms timer run");
 16         timer:set(1000)
 17 end
 18 timer = uloop.timer(t)
 19 timer:set(1000)
 20 
 21 -- timer example 2 (will run once)
 22 uloop.timer(function() print("2000 ms timer run"); end, 2000)
 23 
 24 -- timer example 3 (will never run)
 25 uloop.timer(function() print("3000 ms timer run"); end, 3000):cancel()
 26 
 27 -- periodic interval timer
 28 local intv
 29 intv = uloop.interval(function()
 30         print(string.format("Interval expiration #%d - %dms until next expiration",
 31                 intv:expirations(), intv:remaining()))
 32 
 33         -- after 5 expirations, lower interval to 500ms
 34         if intv:expirations() >= 5 then
 35                 intv:set(500)
 36         end
 37 
 38         -- cancel after 10 expirations
 39         if intv:expirations() >= 10 then
 40                 intv:cancel()
 41         end
 42 end, 1000)
 43 
 44 -- process
 45 function p1(r)
 46         print("Process 1 completed")
 47         print(r)
 48 end
 49 
 50 function p2(r)
 51         print("Process 2 completed")
 52         print(r)
 53 end
 54 
 55 uloop.timer(
 56         function()
 57                 uloop.process("uloop_pid_test.sh", {"foo", "bar"}, {"PROCESS=1"}, p1)
 58         end, 1000
 59 )
 60 uloop.timer(
 61         function()
 62                 uloop.process("uloop_pid_test.sh", {"foo", "bar"}, {"PROCESS=2"}, p2)
 63         end, 2000
 64 )
 65 
 66 -- SIGINT handler
 67 uloop.signal(function(signo)
 68         print(string.format("Terminating on SIGINT (#%d)!", signo))
 69 
 70         -- end uloop to terminate program
 71         uloop.cancel()
 72 end, uloop.SIGINT)
 73 
 74 local sig
 75 sig = uloop.signal(function(signo)
 76         print(string.format("Got SIGUSR2 (#%d)!", signo))
 77 
 78         -- remove signal handler, next SIGUSR2 will terminate program
 79         sig:delete()
 80 end, uloop.SIGUSR2)
 81 
 82 -- Keep udp_ev reference, events will be gc'd, even if the callback is still referenced
 83 -- .delete will manually untrack.
 84 udp_ev = uloop.fd_add(udp, function(ufd, events)
 85         local words, msg_or_ip, port_or_nil = ufd:receivefrom()
 86         print('Recv UDP packet from '..msg_or_ip..':'..port_or_nil..' : '..words)
 87         if words == "Stop!" then
 88                 udp_ev:delete()
 89         end
 90 end, uloop.ULOOP_READ)
 91 
 92 udp_count = 0
 93 udp_send_timer = uloop.timer(
 94         function()
 95                 local s = socket.udp()
 96                 local words
 97                 if udp_count > 3 then
 98                         words = "Stop!"
 99                         udp_send_timer:cancel()
100                 else
101                         words = 'Hello!'
102                         udp_send_timer:set(1000)
103                 end
104                 print('Send UDP packet to 127.0.0.1:8080 :'..words)
105                 s:sendto(words, '127.0.0.1', 8080)
106                 s:close()
107 
108                 udp_count = udp_count + 1
109         end, 3000
110 )
111 
112 uloop.run()
113
This page was automatically generated by LXR 0.3.1. • OpenWrt
OpenWrt.org Cross Reference

Sources/libubox/examples/uloop-example.lua
