lazy loading stdfile

2 files changed, 25 insertions, 8 deletions

diff --git a/xmake/core/base/io.lua b/xmake/core/base/io.lua
index ac405dbac..883fdd19f 100644
--- a/xmake/core/base/io.lua
+++ b/xmake/core/base/io.lua
@@ -619,10 +619,20 @@ function io.tail(filepath, linecount, opt)
     end
 end
 
--- init stdfile
-io.stdin  = io.stdfile("/dev/stdin")
-io.stdout = io.stdfile("/dev/stdout")
-io.stderr = io.stdfile("/dev/stderr")
+-- lazy loading stdfile
+io.stdin  = nil
+io.stdout = nil
+io.stderr = nil
+setmetatable(io, { __index = function (tbl, key)    
+        local val = rawget(tbl, key)
+        if val == nil and (key == "stdin" or key == "stdout" or key == "stderr") then
+            val = io.stdfile("/dev/" .. key)
+            if val ~= nil then
+                rawset(tbl, key, val)
+            end
+        end
+        return val
+    end})
 
 -- return module
 return io
diff --git a/xmake/core/sandbox/modules/io.lua b/xmake/core/sandbox/modules/io.lua
index 8082a5299..525dd6af4 100644
--- a/xmake/core/sandbox/modules/io.lua
+++ b/xmake/core/sandbox/modules/io.lua
@@ -390,10 +390,17 @@ function sandbox_io.tail(filepath, linecount, opt)
     io.tail(filepath, linecount, opt)
 end
 
--- init stdfile
-sandbox_io.stdin  = sandbox_io.stdin  or sandbox_io.stdfile("/dev/stdin")
-sandbox_io.stdout = sandbox_io.stdout or sandbox_io.stdfile("/dev/stdout")
-sandbox_io.stderr = sandbox_io.stderr or sandbox_io.stdfile("/dev/stderr")
+-- lazy loading stdfile
+setmetatable(sandbox_io, { __index = function (tbl, key)    
+        local val = rawget(tbl, key)
+        if val == nil and (key == "stdin" or key == "stdout" or key == "stderr") then
+            val = sandbox_io.stdfile("/dev/" .. key)
+            if val ~= nil then
+                rawset(tbl, key, val)
+            end
+        end
+        return val
+    end})
 
 -- return module
 return sandbox_io