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misc: dont ffi.load if symbol is already loaded #4

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misc: dont ffi.load if symbol is already loaded #4

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76 changes: 38 additions & 38 deletions lib/resty/signal.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -17,49 +17,49 @@ local new_tab = base.new_tab
local error = error


local load_shared_lib
do
local string_gmatch = string.gmatch
local string_match = string.match
local io_open = io.open
local io_close = io.close

local cpath = package.cpath

function load_shared_lib(so_name)
local tried_paths = new_tab(32, 0)
local i = 1

for k, _ in string_gmatch(cpath, "[^;]+") do
local fpath = string_match(k, "(.*/)")
fpath = fpath .. so_name
-- Don't get me wrong, the only way to know if a file exist is
-- trying to open it.
local f = io_open(fpath)
if f ~= nil then
io_close(f)
return ffi.load(fpath)
end

tried_paths[i] = fpath
i = i + 1
end
ffi.cdef[[
int resty_signal_signum(int num);
]]

return nil, tried_paths
end -- function
end -- do

local resty_signal
if not pcall(function() resty_signal = C.resty_signal_signum and C end) then
local string_gmatch = string.gmatch
local string_match = string.match
local io_open = io.open
local io_close = io.close

local resty_signal, tried_paths = load_shared_lib("librestysignal.so")
if not resty_signal then
error("could not load librestysignal.so from the following paths:\n" ..
table.concat(tried_paths, "\n"), 2)
end
local cpath = package.cpath
local tried_paths = new_tab(32, 0)

local function load_shared_lib(so_name)
local i = 1

ffi.cdef[[
int resty_signal_signum(int num);
]]
for k, _ in string_gmatch(cpath, "[^;]+") do
local fpath = string_match(k, "(.*/)")
fpath = fpath .. so_name
-- Don't get me wrong, the only way to know if a file exist is
-- trying to open it.
local f = io_open(fpath)
if f ~= nil then
io_close(f)
return ffi.load(fpath)
end

tried_paths[i] = fpath
i = i + 1
end

return nil, tried_paths
end -- function

resty_signal, tried_paths = load_shared_lib("librestysignal.so")

if not resty_signal then
error("could not load librestysignal.so from the following paths:\n" ..
table.concat(tried_paths, "\n"), 2)
end
end


if not pcall(function () return C.kill end) then
Expand Down