[luatex] Linking to C libraries / TL2017 / FFI

[luigi scarso]

--
-- sleep.lua
--
local ffi = require("ffi")


ffi.cdef[[
void Sleep(int ms);
int poll(struct pollfd *fds, unsigned long nfds, int timeout);
]]

local sleep
if ffi.os == "Windows" then
  function sleep(s)
    ffi.C.Sleep(s*1000)
  end
else
  function sleep(s)
    ffi.C.poll(nil, 0, s*1000)
  end
end

for i=1,160 do
  io.write("."); io.flush()
  sleep(0.01)
end
io.write("\n")


Under linux

$ luajittex --luaonly sleep.lua
................................................................................................................................................................
$ luatex --luaonly sleep.lua
................................................................................................................................................................



-- 
luigi