table_print: do not run hook for C functions

It would be pointless anyway as it cannot provide more information.

diff --git a/daemon/lua/sandbox.lua.in b/daemon/lua/sandbox.lua.in
index 59b9fcb04fe0ffc06cf90de76a4d83a79ddcfbf4..4380d50a6f8341789ad88b532cbee976a6b49ab8 100644 (file)
--- a/daemon/lua/sandbox.lua.in
+++ b/daemon/lua/sandbox.lua.in
@@ -370,6 +370,11 @@ local function funcsign(f)
 -- thanks to AnandA777 from StackOverflow! Function funcsign is adapted version of
 -- https://stackoverflow.com/questions/51095022/inspect-function-signature-in-lua-5-1
        assert(type(f) == 'function', "bad argument #1 to 'funcsign' (function expected)")
+       local debuginfo = debug.getinfo(f)
+       if debuginfo.what == 'C' then  -- names N/A
+               return '(?)'
+       end
+
        local func_args = {}
        pcall(function()
                local oldhook
@@ -378,14 +383,11 @@ local function funcsign(f)
                        delay = delay - 1
                        if delay == 0 then  -- call this only for the introspected function
                                -- stack depth 2 is the introspected function
-                               local debuginfo = debug.getinfo(2)
                                for i = 1, debuginfo.nparams do
                                        local k = debug.getlocal(2, i)
                                        table.insert(func_args, k)
                                end
-                               if debuginfo.what == 'C' then  -- names N/A
-                                       table.insert(func_args, '?')
-                               elseif debuginfo.isvararg then
+                               if debuginfo.isvararg then
                                        table.insert(func_args, "...")
                                end
                                debug.sethook(oldhook)