Lua get hostname

gistfile1.txt

local ffi = require "ffi"
local C = ffi.C

ffi.cdef[[
int gethostname(char *name, size_t len);
]]

local size = 50
local buf = ffi.new("unsigned char[?]", size)

local res = C.gethostname(buf, size)
if res == 0 then
    local hostname = ffi.string(buf, size)

    local host = string.gsub(hostname, "%z+$", "")

    ngx.say(#hostname, ": ", hostname)
    ngx.say(#host, ": ", host)
end

local f = io.popen("/bin/hostname", "r")
if f then
    local host = f:read("*l")
    f:close()

    ngx.say(#host, ": ", host)
end

very cool lua.ffi example to get hostname