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clean and safe random seed initializer

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skywind3000
2019-02-01 17:27:23 +08:00
parent 01b83844db
commit c88b8213c5
1 changed files with 23 additions and 8 deletions
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31
z.lua
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@@ -509,9 +509,12 @@ end
-----------------------------------------------------------------------
function math.random_init()
-- random seed from os.time()
local seed = tostring(os.time()):reverse()
for _, key in ipairs(os.argv) do
seed = seed .. '/' .. key
local seed = tostring(os.time() * 1000)
seed = seed .. tostring(math.random(99999999))
if os.argv ~= nil then
for _, key in ipairs(os.argv) do
seed = seed .. '/' .. key
end
end
local ppid = os.getenv('PPID')
seed = (ppid ~= nil) and (seed .. '/' .. ppid) or seed
@@ -525,9 +528,21 @@ function math.random_init()
if rnd ~= nil then
seed = seed .. rnd
end
local tmpname = os.tmpname()
seed = seed .. tmpname
os.remove(tmpname)
if not windows then
local fp = io.open('/dev/random', 'rb')
if fp ~= nil then
seed = seed .. fp:read(10)
fp:close()
end
else
if math.random_inited == nil then
math.random_inited = 1
local name = os.tmpname()
os.remove(name)
seed = seed .. name
end
end
seed = seed .. tostring(os.clock() * 10000000)
local number = 0
for i = 1, seed:len() do
local k = string.byte(seed:sub(i, i))
@@ -621,8 +636,8 @@ function data_save(filename, M)
fp = io.open(filename, 'w')
else
math.random_init()
tmpname = filename .. '.' .. math.random_string(6)
tmpname = tmpname .. tostring(os.time())
tmpname = filename .. '.' .. tostring(os.time())
tmpname = tmpename .. math.random_string(8)
local rnd = os.getenv('_ZL_RANDOM')
tmpname = tmpname .. '' .. (rnd and rnd or '')
-- print('tmpname: '..tmpname)