lua: получить размер файла

=========== funcs.lua
function fsize (file)
        local current = file:seek()      -- get current position
        local size = file:seek("end")    -- get file size
        file:seek("set", current)        -- restore position
        return size
end
=========== checklibs.lua
dofile("funcs.lua")

libs_file = io.open("librt.so.0","r")
print(fsize(libs_file))
libs_file:close()
===========

http://lua-users.org/lists/lua-l/2011-04/msg00785.html

Вероятный оригинал

http://www.lua.org/pil/21.3.html

В таком виде и гуляет функция fsize, даже с nginx связали

https://gist.github.com/perusio/2133228

location ~* \.(?:gif|jpe?g|png)$ {


    set_by_lua $img_file_size '


      function fsize (file)


        local current = file:seek()      -- get current position


        local size = file:seek("end")    -- get file size


        file:seek("set", current)        -- restore position


        return size


      end


      fsize(ngx.var.request_filename)';


}