/usr/share/lua/5.1/cqueues/auxlib.lua is in lua-cqueues 20161214-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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local cqueues = require"_cqueues"
local errno = require"_cqueues.errno"
local auxlib = require"_cqueues.auxlib"
local coroutine = require"coroutine"
--
-- auxlib.tostring
--
-- Yieldable tostring. Implemented in C for Lua 5.2 and above.
--
-- Lua 5.1 API doesn't allow us to implement a yieldable tostring
-- routine. Fortunately, LuaJIT's tostring permits yielding.
--
auxlib.tostring = auxlib.tostring or tostring
--
-- auxlib.resume
-- auxlib.wrap
--
-- Wrappers for multilevel coroutine management to allow I/O polling
-- of coroutine-wrapped code. The code checks for a special value
-- returned by cqueues.poll, and will propogate a yield on I/O.
-- Everything else should behave as usual.
--
local _POLL = cqueues._POLL -- magic internal value
local l_resume = coroutine.resume -- take reference to permit monkey patching
local l_yield = coroutine.yield
local function c_resume(co, ok, arg1, ...)
if ok and arg1 == _POLL then
return auxlib.resume(co, l_yield(_POLL, ...))
else
return ok, arg1, ...
end
end -- c_resume
function auxlib.resume(co, ...)
return c_resume(co, l_resume(co, ...))
end -- auxlib.resume
local function c_wrap(co, ok, ...)
if ok then
return ...
else
error((...), 0)
end
end -- c_wrap
function auxlib.wrap(f)
local co = coroutine.create(f)
return function(...)
return c_wrap(co, c_resume(co, l_resume(co, ...)))
end
end -- auxlib.wrap
--
-- auxlib.assert
--
-- If condition is false, locate and use the first non-false,
-- non-nil value as the reason. If an integer value, attempt to
-- convert to string using strerror.
--
-- RATIONALE: Many routines return only an integer error number.
-- Errors like EAGAIN are very common and constantly pushing a new
-- string on the stack from C would be inefficient.
--
-- Also, unlike the standard Lua idiom, the failure mode for some
-- routines will return multiple false or nil values preceding the
-- error number so user code doesn't need to use variable names like
-- "value_or_error" for routines which can be expected to fail
-- regularly in the normal course of operation and where simply
-- using the assert idiom would create spaghetti code.
--
local tostring = auxlib.tostring
local function findwhy(v, ...)
if v then
if type(v) == "number" then
-- return string and number for auxlib.fileresult
return (errno.strerror(v) or tostring(v)), v
else
return tostring(v), ...
end
elseif select("#", ...) > 0 then
return findwhy(...)
else
return
end
end
function auxlib.assert(c, ...)
if c then
return c, ...
end
return error(findwhy(...), 2)
end -- auxlib.assert
--
-- auxlib.assert[23456789]
--
-- Like auxlib.assert, but use error(message, level) where level is
-- the numeric suffix of the assert function name.
--
local function makeassert(level)
return function (c, ...)
if c then
return c, ...
end
return error(findwhy(...), level)
end
end
for n=2,9 do
auxlib[string.format("assert%d", n)] = makeassert(n)
end
--
-- auxlib.fileresult
--
function auxlib.fileresult(c, ...)
if c then
return c, ...
else
return c, findwhy(...)
end
end -- auxlib.fileresult
auxlib.loader = loader
return auxlib
end -- loader
return loader(loader, ...)
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