25 files changed, 580 insertions, 53 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1c9e15e..d4107d6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -27,6 +27,22 @@ The scope of what is covered by the version number excludes:
 
 ## Version history
 
+### version 0.6.2, released 15-Apr-2025
+
+ - Fix: autotermrestore didn't work because its metatable was overwritten.
+
+### version 0.6.1, released 13-Apr-2025
+
+- Docs: document readansi internal buffer for incomplete sequences.
+- Fix: ensure to properly parse `<alt>+key` key presses
+
+### version 0.6.0, released 10-Apr-2025
+
+- Fix: when sleep returns an error, pass that on in `readkey`.
+- Feat: added `detachfds` which will create separate file descriptions for `stdout`
+  and `stderr` to ensure that related settings (eg. non-blocking flag) will not be shared
+  amongst those streams and `stdin`.
+
 ### version 0.5.1, released 12-Mar-2025
 
 - Fix: on older unixes with glibc < 2.25, fall back to `/dev/urandom`
@@ -38,12 +54,12 @@ The scope of what is covered by the version number excludes:
 - Feat: allow passing in a sleep function to `readkey` and `readansi`
 - Fix: NetBSD fix compilation, undeclared directives
 - Refactor: random bytes; remove deprecated API usage on Windows, move to
-  binary api instead of /dev/urandom file on linux and bsd
+  binary api instead of `/dev/urandom` file on linux and bsd
 
 ### version 0.4.5, released 18-Dec-2024
 
 - Fix: suppress a warning when building with clang
-- Fix: do not rely on luaconf.h to include limits.h, fixes builds with latest LuaJIT (#38).
+- Fix: do not rely on `luaconf.h` to include `limits.h`, fixes builds with latest LuaJIT (#38).
 
 ### version 0.4.4, released 03-Sep-2024
 
diff --git a/doc_topics/03-terminal.md b/doc_topics/03-terminal.md
index 5bdf543..a5341d6 100644
--- a/doc_topics/03-terminal.md
+++ b/doc_topics/03-terminal.md
@@ -16,6 +16,7 @@ Since there are a myriad of settings available;
 - `system.setconsoleflags` (Windows)
 - `system.setconsolecp` (Windows)
 - `system.setconsoleoutputcp` (Windows)
+- `system.detachfds` (Posix)
 - `system.setnonblock` (Posix)
 - `system.tcsetattr` (Posix)
 
@@ -105,6 +106,7 @@ To use non-blocking input here's how to set it up:
     sys.setconsoleflags(io.stdin, sys.getconsoleflags(io.stdin) - sys.CIF_ECHO_INPUT - sys.CIF_LINE_INPUT)
 
     -- setup Posix by disabling echo, canonical mode, and making non-blocking
+    sys.detachfds()  -- ensure stdin/out/err have their own file descriptions
     local of_attr = sys.tcgetattr(io.stdin)
     sys.tcsetattr(io.stdin, sys.TCSANOW, {
       lflag = of_attr.lflag - sys.L_ICANON - sys.L_ECHO,
diff --git a/docs/classes/bitflags.html b/docs/classes/bitflags.html
index 647cc62..3e99d0e 100644
--- a/docs/classes/bitflags.html
+++ b/docs/classes/bitflags.html
@@ -298,7 +298,7 @@ return <code>false</code> if the flags are checked.
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
-<i style="float:right;">Last updated 2025-03-12 15:17:50 </i>
+<i style="float:right;">Last updated 2025-04-15 13:14:45 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>
diff --git a/docs/examples/compat.lua.html b/docs/examples/compat.lua.html
index e421044..b57a912 100644
--- a/docs/examples/compat.lua.html
+++ b/docs/examples/compat.lua.html
@@ -112,7 +112,7 @@
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
-<i style="float:right;">Last updated 2025-03-12 15:17:50 </i>
+<i style="float:right;">Last updated 2025-04-15 13:14:45 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>
diff --git a/docs/examples/flag_debugging.lua.html b/docs/examples/flag_debugging.lua.html
index e8a75e3..616ce69 100644
--- a/docs/examples/flag_debugging.lua.html
+++ b/docs/examples/flag_debugging.lua.html
@@ -80,7 +80,7 @@
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
-<i style="float:right;">Last updated 2025-03-12 15:17:50 </i>
+<i style="float:right;">Last updated 2025-04-15 13:14:45 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>
diff --git a/docs/examples/password_input.lua.html b/docs/examples/password_input.lua.html
index a5eac4d..faa0473 100644
--- a/docs/examples/password_input.lua.html
+++ b/docs/examples/password_input.lua.html
@@ -132,7 +132,7 @@ useful for reading secrets from the user.
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
-<i style="float:right;">Last updated 2025-03-12 15:17:50 </i>
+<i style="float:right;">Last updated 2025-04-15 13:14:45 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>
diff --git a/docs/examples/read.lua.html b/docs/examples/read.lua.html
index 3b53a8b..1a9648c 100644
--- a/docs/examples/read.lua.html
+++ b/docs/examples/read.lua.html
@@ -143,7 +143,7 @@ sys.<span class="function-name">setnonblock</span>(<span class="global">io</span
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
-<i style="float:right;">Last updated 2025-03-12 15:17:50 </i>
+<i style="float:right;">Last updated 2025-04-15 13:14:45 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>
diff --git a/docs/examples/readline.lua.html b/docs/examples/readline.lua.html
index dd63721..fad5df7 100644
--- a/docs/examples/readline.lua.html
+++ b/docs/examples/readline.lua.html
@@ -549,7 +549,7 @@ sys.<span class="function-name">setconsoleflags</span>(<span class="global">io</
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
-<i style="float:right;">Last updated 2025-03-12 15:17:50 </i>
+<i style="float:right;">Last updated 2025-04-15 13:14:45 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>
diff --git a/docs/examples/spinner.lua.html b/docs/examples/spinner.lua.html
index 99a1c91..c776106 100644
--- a/docs/examples/spinner.lua.html
+++ b/docs/examples/spinner.lua.html
@@ -137,7 +137,7 @@ sys.<span class="function-name">setnonblock</span>(<span class="global">io</span
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
-<i style="float:right;">Last updated 2025-03-12 15:17:50 </i>
+<i style="float:right;">Last updated 2025-04-15 13:14:45 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>
diff --git a/docs/examples/spiral_snake.lua.html b/docs/examples/spiral_snake.lua.html
index 7be16e8..a102103 100644
--- a/docs/examples/spiral_snake.lua.html
+++ b/docs/examples/spiral_snake.lua.html
@@ -145,7 +145,7 @@ codes for moving the cursor around.
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
-<i style="float:right;">Last updated 2025-03-12 15:17:50 </i>
+<i style="float:right;">Last updated 2025-04-15 13:14:45 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>
diff --git a/docs/examples/terminalsize.lua.html b/docs/examples/terminalsize.lua.html
index 6a6a93e..9aca861 100644
--- a/docs/examples/terminalsize.lua.html
+++ b/docs/examples/terminalsize.lua.html
@@ -110,7 +110,7 @@ sys.<span class="function-name">tcsetattr</span>(<span class="global">io</span>.
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
-<i style="float:right;">Last updated 2025-03-12 15:17:50 </i>
+<i style="float:right;">Last updated 2025-04-15 13:14:45 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>
diff --git a/docs/index.html b/docs/index.html
index 5d7b02f..6461689 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -142,7 +142,7 @@
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
-<i style="float:right;">Last updated 2025-03-12 15:17:50 </i>
+<i style="float:right;">Last updated 2025-04-15 13:14:45 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>
diff --git a/docs/modules/system.html b/docs/modules/system.html
index fa41458..0934b35 100644
--- a/docs/modules/system.html
+++ b/docs/modules/system.html
@@ -124,6 +124,10 @@
         <td class="summary">Backs up terminal settings and restores them on application exit.</td>
         </tr>
         <tr>
+        <td class="name" nowrap><a href="#detachfds">detachfds ()</a></td>
+        <td class="summary">Creates new file descriptions for <code>stdout</code> and <code>stderr</code>.</td>
+        </tr>
+        <tr>
         <td class="name" nowrap><a href="#getconsolecp">getconsolecp ()</a></td>
         <td class="summary">Gets the current console code page (Windows).</td>
         </tr>
@@ -498,6 +502,40 @@ sequences will be buffered internally and returned one byte at a time.
 
 </dd>
     <dt>
+    <a name = "detachfds"></a>
+    <strong>detachfds ()</strong>
+    </dt>
+    <dd>
+    Creates new file descriptions for <code>stdout</code> and <code>stderr</code>.
+Even if the file descriptors are unique, they still might point to the same
+file description, and hence share settings like <code>O_NONBLOCK</code>. This means that
+if one of them is set to non-blocking, the other will be as well. This can
+lead to unexpected behavior.</p>
+
+<p>This function is used to detach <code>stdout</code> and <code>stderr</code> from the original
+file descriptions, and create new file descriptions for them. This allows
+independent control of flags (e.g., <code>O_NONBLOCK</code>) on <code>stdout</code> and <code>stderr</code>,
+avoiding shared side effects.</p>
+
+<p>Does not modify <code>stdin</code> (fd 0), and does nothing on Windows.
+
+
+
+    <h3>Returns:</h3>
+    <ol>
+
+        boolean <code>true</code> on success, or throws an error on failure.
+    </ol>
+
+
+    <h3>See also:</h3>
+    <ul>
+         <a href="../modules/system.html#setnonblock">setnonblock</a>
+    </ul>
+
+
+</dd>
+    <dt>
     <a name = "getconsolecp"></a>
     <strong>getconsolecp ()</strong>
     </dt>
@@ -632,6 +670,10 @@ for more information on the flags.
     </ol>
 
 
+    <h3>See also:</h3>
+    <ul>
+         <a href="../modules/system.html#setnonblock">setnonblock</a>
+    </ul>
 
 
 </dd>
@@ -772,7 +814,9 @@ system.<span class="function-name">listconsoleflags</span>(<span class="global">
         error message; <code>&quot;timeout&quot;</code> if the timeout was reached.</li>
         <li>
            <span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
-        partial result in case of an error while reading a sequence, the sequence so far.</li>
+         partial result in case of an error while reading a sequence, the sequence so far.
+ The function retains its own internal buffer, so on the next call the incomplete buffer is used to
+ complete the sequence.</li>
     </ol>
 
 
@@ -801,7 +845,7 @@ system.<span class="function-name">listconsoleflags</span>(<span class="global">
         </li>
         <li><span class="parameter">fsleep</span>
             <span class="types"><span class="type">function</span></span>
-         the function to call for sleeping.
+         the function to call for sleeping; <code>ok, err = fsleep(secs)</code>
          (<em>default</em> system.sleep)
         </li>
     </ul>
@@ -819,7 +863,7 @@ system.<span class="function-name">listconsoleflags</span>(<span class="global">
         if no key was read</li>
         <li>
            <span class="types"><a class="type" href="https://www.lua.org/manual/5.4/manual.html#6.4">string</a></span>
-        error message; <code>&quot;timeout&quot;</code> if the timeout was reached.</li>
+        error message when the timeout was reached (<code>&quot;timeout&quot;</code>), or if <a href="../modules/system.html#sleep">sleep</a> failed.</li>
     </ol>
 
 
@@ -947,6 +991,7 @@ system.<span class="function-name">listconsoleflags</span>(<span class="global">
     </dt>
     <dd>
     Enables or disables non-blocking mode for a file (Posix).
+Check <a href="../modules/system.html#detachfds">detachfds</a> in case there are shared file descriptions.
 
 
     <h3>Parameters:</h3>
@@ -985,13 +1030,15 @@ system.<span class="function-name">listconsoleflags</span>(<span class="global">
 
     <h3>See also:</h3>
     <ul>
-         <a href="../modules/system.html#getnonblock">getnonblock</a>
+         <li><a href="../modules/system.html#getnonblock">getnonblock</a></li>
+         <li><a href="../modules/system.html#detachfds">detachfds</a></li>
     </ul>
 
     <h3>Usage:</h3>
     <ul>
         <pre class="example"><span class="keyword">local</span> sys = <span class="global">require</span>(<span class="string">'system'</span>)
-
+sys.<span class="function-name">detachfds</span>() <span class="comment">-- detach stdout and stderr, so only stdin becomes non-blocking
+</span>
 <span class="comment">-- set io.stdin to non-blocking mode
 </span><span class="keyword">local</span> old_setting = sys.<span class="function-name">getnonblock</span>(<span class="global">io</span>.stdin)
 sys.<span class="function-name">setnonblock</span>(<span class="global">io</span>.stdin, <span class="keyword">true</span>)
@@ -1422,7 +1469,7 @@ This function will sleep, without doing a busy-loop and wasting CPU cycles.
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
-<i style="float:right;">Last updated 2025-03-12 15:17:50 </i>
+<i style="float:right;">Last updated 2025-04-15 13:14:45 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>
diff --git a/docs/topics/01-introduction.md.html b/docs/topics/01-introduction.md.html
index f0f627d..5c62ad3 100644
--- a/docs/topics/01-introduction.md.html
+++ b/docs/topics/01-introduction.md.html
@@ -84,7 +84,7 @@ independence.</p>
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
-<i style="float:right;">Last updated 2025-03-12 15:17:50 </i>
+<i style="float:right;">Last updated 2025-04-15 13:14:45 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>
diff --git a/docs/topics/02-development.md.html b/docs/topics/02-development.md.html
index 315fa37..197fde7 100644
--- a/docs/topics/02-development.md.html
+++ b/docs/topics/02-development.md.html
@@ -84,7 +84,7 @@ pass locally, and do not rely on CI only.</p>
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
-<i style="float:right;">Last updated 2025-03-12 15:17:50 </i>
+<i style="float:right;">Last updated 2025-04-15 13:14:45 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>
diff --git a/docs/topics/03-terminal.md.html b/docs/topics/03-terminal.md.html
index 7ce28af..84465af 100644
--- a/docs/topics/03-terminal.md.html
+++ b/docs/topics/03-terminal.md.html
@@ -93,6 +93,7 @@ up both platforms to make it work.</p>
     <li><a href="../modules/system.html#setconsoleflags">system.setconsoleflags</a> (Windows)</li>
     <li><a href="../modules/system.html#setconsolecp">system.setconsolecp</a> (Windows)</li>
     <li><a href="../modules/system.html#setconsoleoutputcp">system.setconsoleoutputcp</a> (Windows)</li>
+    <li><a href="../modules/system.html#detachfds">system.detachfds</a> (Posix)</li>
     <li><a href="../modules/system.html#setnonblock">system.setnonblock</a> (Posix)</li>
     <li><a href="../modules/system.html#tcsetattr">system.tcsetattr</a> (Posix)</li>
 </ul>
@@ -195,6 +196,7 @@ also not being echoed to the terminal (independent of the echo settings used wit
 </span>sys.<span class="function-name">setconsoleflags</span>(<span class="global">io</span>.stdin, sys.<span class="function-name">getconsoleflags</span>(<span class="global">io</span>.stdin) - sys.CIF_ECHO_INPUT - sys.CIF_LINE_INPUT)
 
 <span class="comment">-- setup Posix by disabling echo, canonical mode, and making non-blocking
+</span>sys.<span class="function-name">detachfds</span>()  <span class="comment">-- ensure stdin/out/err have their own file descriptions
 </span><span class="keyword">local</span> of_attr = sys.<span class="function-name">tcgetattr</span>(<span class="global">io</span>.stdin)
 sys.<span class="function-name">tcsetattr</span>(<span class="global">io</span>.stdin, sys.TCSANOW, {
   lflag = of_attr.lflag - sys.L_ICANON - sys.L_ECHO,
@@ -218,7 +220,7 @@ For an example see <a href="../examples/password_input.lua.html"><code>examples/
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
-<i style="float:right;">Last updated 2025-03-12 15:17:50 </i>
+<i style="float:right;">Last updated 2025-04-15 13:14:45 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>
diff --git a/docs/topics/CHANGELOG.md.html b/docs/topics/CHANGELOG.md.html
index fa2d706..8a26156 100644
--- a/docs/topics/CHANGELOG.md.html
+++ b/docs/topics/CHANGELOG.md.html
@@ -106,6 +106,28 @@
 <p><a name="Version_history"></a></p>
 <h2>Version history</h2>
 
+<h3>version 0.6.2, released 15-Apr-2025</h3>
+
+<ul>
+    <li>Fix: autotermrestore didn't work because its metatable was overwritten.</li>
+</ul>
+
+<h3>version 0.6.1, released 13-Apr-2025</h3>
+
+<ul>
+    <li>Docs: document readansi internal buffer for incomplete sequences.</li>
+    <li>Fix: ensure to properly parse <code>&lt;alt&gt;+key</code> key presses</li>
+</ul>
+
+<h3>version 0.6.0, released 10-Apr-2025</h3>
+
+<ul>
+    <li>Fix: when sleep returns an error, pass that on in <code>readkey</code>.</li>
+    <li>Feat: added <code>detachfds</code> which will create separate file descriptions for <code>stdout</code>
+    and <code>stderr</code> to ensure that related settings (eg. non-blocking flag) will not be shared
+    amongst those streams and <code>stdin</code>.</li>
+</ul>
+
 <h3>version 0.5.1, released 12-Mar-2025</h3>
 
 <ul>
@@ -120,14 +142,14 @@
     <li>Feat: allow passing in a sleep function to <code>readkey</code> and <code>readansi</code></li>
     <li>Fix: NetBSD fix compilation, undeclared directives</li>
     <li>Refactor: random bytes; remove deprecated API usage on Windows, move to
-    binary api instead of /dev/urandom file on linux and bsd</li>
+    binary api instead of <code>/dev/urandom</code> file on linux and bsd</li>
 </ul>
 
 <h3>version 0.4.5, released 18-Dec-2024</h3>
 
 <ul>
     <li>Fix: suppress a warning when building with clang</li>
-    <li>Fix: do not rely on luaconf.h to include limits.h, fixes builds with latest LuaJIT (#38).</li>
+    <li>Fix: do not rely on <code>luaconf.h</code> to include <code>limits.h</code>, fixes builds with latest LuaJIT (#38).</li>
 </ul>
 
 <h3>version 0.4.4, released 03-Sep-2024</h3>
@@ -199,7 +221,7 @@
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
-<i style="float:right;">Last updated 2025-03-12 15:17:50 </i>
+<i style="float:right;">Last updated 2025-04-15 13:14:45 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>
diff --git a/docs/topics/LICENSE.md.html b/docs/topics/LICENSE.md.html
index 612cdb9..198c238 100644
--- a/docs/topics/LICENSE.md.html
+++ b/docs/topics/LICENSE.md.html
@@ -94,7 +94,7 @@ SOFTWARE.</p>
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/lunarmodules/LDoc">LDoc 1.5.0</a></i>
-<i style="float:right;">Last updated 2025-03-12 15:17:50 </i>
+<i style="float:right;">Last updated 2025-04-15 13:14:45 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>
diff --git a/rockspecs/luasystem-0.6.0-1.rockspec b/rockspecs/luasystem-0.6.0-1.rockspec
new file mode 100644
index 0000000..21c2dc0
--- /dev/null
+++ b/rockspecs/luasystem-0.6.0-1.rockspec
@@ -0,0 +1,85 @@
+local package_name = "luasystem"
+local package_version = "0.6.0"
+local rockspec_revision = "1"
+local github_account_name = "lunarmodules"
+local github_repo_name = "luasystem"
+
+
+package = package_name
+version = package_version.."-"..rockspec_revision
+
+source = {
+  url = "git+https://github.com/"..github_account_name.."/"..github_repo_name..".git",
+  branch = (package_version == "scm") and "master" or nil,
+  tag = (package_version ~= "scm") and "v"..package_version or nil,
+}
+
+description = {
+  summary = 'Platform independent system calls for Lua.',
+  detailed = [[
+    Adds a Lua API for making platform independent system calls.
+  ]],
+  license = 'MIT <http://opensource.org/licenses/MIT>',
+  homepage = "https://github.com/"..github_account_name.."/"..github_repo_name,
+}
+
+dependencies = {
+  'lua >= 5.1',
+}
+
+local function make_platform(plat)
+  local defines = {
+    linux = { },
+    unix = { },
+    macosx = { },
+    win32 = { "WINVER=0x0600", "_WIN32_WINNT=0x0600" },
+    mingw32 = { "WINVER=0x0600", "_WIN32_WINNT=0x0600" },
+  }
+  local libraries = {
+    linux = { "rt" },
+    unix = { },
+    macosx = { },
+    win32 = { "advapi32", "winmm", "bcrypt" },
+    mingw32 = { },
+  }
+  local libdirs = {
+    linux = nil,
+    unix = nil,
+    macosx = nil,
+    win32 = nil,
+    mingw32 = { },
+  }
+  return {
+    modules = {
+      ['system.core'] = {
+        sources = {
+          'src/core.c',
+          'src/compat.c',
+          'src/time.c',
+          'src/environment.c',
+          'src/random.c',
+          'src/term.c',
+          'src/bitflags.c',
+          'src/wcwidth.c',
+        },
+        defines = defines[plat],
+        libraries = libraries[plat],
+        libdirs = libdirs[plat],
+      },
+    },
+  }
+end
+
+build = {
+  type = 'builtin',
+  platforms = {
+    linux = make_platform('linux'),
+    unix = make_platform('unix'),
+    macosx = make_platform('macosx'),
+    win32 = make_platform('win32'),
+    mingw32 = make_platform('mingw32'),
+  },
+  modules = {
+    ['system.init'] = 'system/init.lua',
+  },
+}
diff --git a/rockspecs/luasystem-0.6.1-1.rockspec b/rockspecs/luasystem-0.6.1-1.rockspec
new file mode 100644
index 0000000..51bbddd
--- /dev/null
+++ b/rockspecs/luasystem-0.6.1-1.rockspec
@@ -0,0 +1,85 @@
+local package_name = "luasystem"
+local package_version = "0.6.1"
+local rockspec_revision = "1"
+local github_account_name = "lunarmodules"
+local github_repo_name = "luasystem"
+
+
+package = package_name
+version = package_version.."-"..rockspec_revision
+
+source = {
+  url = "git+https://github.com/"..github_account_name.."/"..github_repo_name..".git",
+  branch = (package_version == "scm") and "master" or nil,
+  tag = (package_version ~= "scm") and "v"..package_version or nil,
+}
+
+description = {
+  summary = 'Platform independent system calls for Lua.',
+  detailed = [[
+    Adds a Lua API for making platform independent system calls.
+  ]],
+  license = 'MIT <http://opensource.org/licenses/MIT>',
+  homepage = "https://github.com/"..github_account_name.."/"..github_repo_name,
+}
+
+dependencies = {
+  'lua >= 5.1',
+}
+
+local function make_platform(plat)
+  local defines = {
+    linux = { },
+    unix = { },
+    macosx = { },
+    win32 = { "WINVER=0x0600", "_WIN32_WINNT=0x0600" },
+    mingw32 = { "WINVER=0x0600", "_WIN32_WINNT=0x0600" },
+  }
+  local libraries = {
+    linux = { "rt" },
+    unix = { },
+    macosx = { },
+    win32 = { "advapi32", "winmm", "bcrypt" },
+    mingw32 = { },
+  }
+  local libdirs = {
+    linux = nil,
+    unix = nil,
+    macosx = nil,
+    win32 = nil,
+    mingw32 = { },
+  }
+  return {
+    modules = {
+      ['system.core'] = {
+        sources = {
+          'src/core.c',
+          'src/compat.c',
+          'src/time.c',
+          'src/environment.c',
+          'src/random.c',
+          'src/term.c',
+          'src/bitflags.c',
+          'src/wcwidth.c',
+        },
+        defines = defines[plat],
+        libraries = libraries[plat],
+        libdirs = libdirs[plat],
+      },
+    },
+  }
+end
+
+build = {
+  type = 'builtin',
+  platforms = {
+    linux = make_platform('linux'),
+    unix = make_platform('unix'),
+    macosx = make_platform('macosx'),
+    win32 = make_platform('win32'),
+    mingw32 = make_platform('mingw32'),
+  },
+  modules = {
+    ['system.init'] = 'system/init.lua',
+  },
+}
diff --git a/rockspecs/luasystem-0.6.2-1.rockspec b/rockspecs/luasystem-0.6.2-1.rockspec
new file mode 100644
index 0000000..7a8549f
--- /dev/null
+++ b/rockspecs/luasystem-0.6.2-1.rockspec
@@ -0,0 +1,85 @@
+local package_name = "luasystem"
+local package_version = "0.6.2"
+local rockspec_revision = "1"
+local github_account_name = "lunarmodules"
+local github_repo_name = "luasystem"
+
+
+package = package_name
+version = package_version.."-"..rockspec_revision
+
+source = {
+  url = "git+https://github.com/"..github_account_name.."/"..github_repo_name..".git",
+  branch = (package_version == "scm") and "master" or nil,
+  tag = (package_version ~= "scm") and "v"..package_version or nil,
+}
+
+description = {
+  summary = 'Platform independent system calls for Lua.',
+  detailed = [[
+    Adds a Lua API for making platform independent system calls.
+  ]],
+  license = 'MIT <http://opensource.org/licenses/MIT>',
+  homepage = "https://github.com/"..github_account_name.."/"..github_repo_name,
+}
+
+dependencies = {
+  'lua >= 5.1',
+}
+
+local function make_platform(plat)
+  local defines = {
+    linux = { },
+    unix = { },
+    macosx = { },
+    win32 = { "WINVER=0x0600", "_WIN32_WINNT=0x0600" },
+    mingw32 = { "WINVER=0x0600", "_WIN32_WINNT=0x0600" },
+  }
+  local libraries = {
+    linux = { "rt" },
+    unix = { },
+    macosx = { },
+    win32 = { "advapi32", "winmm", "bcrypt" },
+    mingw32 = { },
+  }
+  local libdirs = {
+    linux = nil,
+    unix = nil,
+    macosx = nil,
+    win32 = nil,
+    mingw32 = { },
+  }
+  return {
+    modules = {
+      ['system.core'] = {
+        sources = {
+          'src/core.c',
+          'src/compat.c',
+          'src/time.c',
+          'src/environment.c',
+          'src/random.c',
+          'src/term.c',
+          'src/bitflags.c',
+          'src/wcwidth.c',
+        },
+        defines = defines[plat],
+        libraries = libraries[plat],
+        libdirs = libdirs[plat],
+      },
+    },
+  }
+end
+
+build = {
+  type = 'builtin',
+  platforms = {
+    linux = make_platform('linux'),
+    unix = make_platform('unix'),
+    macosx = make_platform('macosx'),
+    win32 = make_platform('win32'),
+    mingw32 = make_platform('mingw32'),
+  },
+  modules = {
+    ['system.init'] = 'system/init.lua',
+  },
+}
diff --git a/spec/04-term_spec.lua b/spec/04-term_spec.lua
index 907f903..0ce0033 100644
--- a/spec/04-term_spec.lua
+++ b/spec/04-term_spec.lua
@@ -855,6 +855,32 @@ describe("Terminal:", function()
         assert.is.near(1, timing, 0.5)       -- this also works for MacOS in CI
       end)
 
+
+      it("calls flseep to execute the sleep", function()
+        setbuffer("")
+
+        local sleep_called = false
+        local mysleep = function()
+          sleep_called = true
+        end
+
+        system.readkey(0.01, mysleep)
+        assert.is_true(sleep_called)
+      end)
+
+
+      it("returns errors by fsleep", function()
+        setbuffer("")
+
+        local mysleep = function()
+          return nil, "boom!"
+        end
+
+        local ok, err = system.readkey(1, mysleep)
+        assert.is.falsy(ok)
+        assert.equals("boom!", err)
+      end)
+
     end)
 
 
@@ -902,10 +928,31 @@ describe("Terminal:", function()
       end)
 
 
+      it("reads ANSI escape sequences, just an '<esc>O' (<alt><O> key press)", function()
+        setbuffer("\27O")
+        assert.are.same({"\27O", "ansi"}, {system.readansi(0)})
+      end)
+
+
+      it("reads <alt>+key key presses; <esc>+<key>", function()
+        setbuffer("\27a\27b\27c\27d")
+        assert.are.same({"\27a", "ansi"}, {system.readansi(0)})
+        assert.are.same({"\27b", "ansi"}, {system.readansi(0)})
+        assert.are.same({"\27c", "ansi"}, {system.readansi(0)})
+        assert.are.same({"\27d", "ansi"}, {system.readansi(0)})
+      end)
+
+
+      it("reads <ctrl><alt>[ key press; <esc>+<esc>", function()
+        setbuffer("\27\27\27\27")
+        assert.are.same({"\27\27", "ansi"}, {system.readansi(0)})
+        assert.are.same({"\27\27", "ansi"}, {system.readansi(0)})
+      end)
+
+
       it("returns a single <esc> character if no sequence is found", function()
-        setbuffer("\27\27[A")
+        setbuffer("\27")
         assert.are.same({"\27", "char"}, {system.readansi(0)})
-        assert.are.same({"\27[A", "ansi"}, {system.readansi(0)})
       end)
 
 
@@ -919,6 +966,22 @@ describe("Terminal:", function()
         assert.is.near(1, timing, 0.5)       -- this also works for MacOS in CI
       end)
 
+
+      it("incomplete ANSI sequences will be completed on next call", function()
+        setbuffer("\27[")
+        assert.are.same({nil, "timeout", "\27["}, {system.readansi(0)})
+        setbuffer("A")
+        assert.are.same({"\27[A", "ansi"}, {system.readansi(0)})
+      end)
+
+
+      it("incomplete UTF8 sequences will be completed on next call", function()
+        setbuffer(string.char(240, 159))
+        assert.are.same({nil, "timeout", string.char(240, 159)}, {system.readansi(0)})
+        setbuffer(string.char(154, 128))
+        assert.are.same({"🚀", "char"}, {system.readansi(0)})
+      end)
+
     end)
 
   end)
diff --git a/src/core.c b/src/core.c
index b642074..7776de4 100644
--- a/src/core.c
+++ b/src/core.c
@@ -4,7 +4,7 @@
 #include <lua.h>
 #include <lauxlib.h>
 
-#define LUASYSTEM_VERSION   "LuaSystem 0.5.1"
+#define LUASYSTEM_VERSION   "LuaSystem 0.6.2"
 
 #ifdef _WIN32
 #define LUAEXPORT __declspec(dllexport)
diff --git a/src/term.c b/src/term.c
index 4cfce95..792832d 100644
--- a/src/term.c
+++ b/src/term.c
@@ -649,8 +649,104 @@ static int lst_tcsetattr(lua_State *L)
 
 
 
+#ifndef _WIN32
+/*
+reopen FDs for independent file descriptions.
+*/
+static void reopen_fd(lua_State *L, int fd, int flags) {
+    char path[64];
+    int newfd = -1;
+
+    if (fd != STDOUT_FILENO && fd != STDERR_FILENO) {
+        luaL_error(L, "Invalid file descriptor: %d. Only stdout (1) and stderr (2) are supported.", fd);
+    }
+
+    const char *fallback_path = (fd == STDOUT_FILENO) ? "/dev/stdout" :
+                                (fd == STDERR_FILENO) ? "/dev/stderr" : NULL;
+
+    // If fd is a terminal, reopen its actual device (e.g. /dev/ttys003)
+    // Works on all POSIX platforms that have terminals (macOS, Linux, BSD, etc.)
+    if (isatty(fd)) {
+        const char *tty = ttyname(fd);
+        if (tty) {
+            newfd = open(tty, flags);
+        }
+    }
+
+    if (newfd < 0) {
+        // For non-tty: try /dev/fd/N — POSIX-compliant and standard on macOS, Linux, BSD.
+        // This gives a new file description even if the target is a file or pipe.
+        snprintf(path, sizeof(path), "/dev/fd/%d", fd);
+        newfd = open(path, flags);
+    }
+
+    if (newfd < 0) {
+        // Fallback: for platforms/environments where /dev/fd/N doesn't exist.
+        // /dev/stdout and /dev/stderr are standard on Linux, but may not create new descriptions.
+        if (fallback_path) {
+            newfd = open(fallback_path, flags);
+        }
+    }
+
+    if (newfd < 0) {
+        // All attempts failed — raise error with detailed info (call will not return)
+        luaL_error(L, "Failed to reopen fd %d: tried ttyname(), /dev/fd/%d, and fallback %s: %s",
+                    fd, fd, fallback_path ? fallback_path : "(none)", strerror(errno));
+    }
+
+    // Replace the original fd with the new one
+    if (dup2(newfd, fd) < 0) {
+        close(newfd);
+        luaL_error(L, "dup2 failed for fd %d: %s", fd, strerror(errno));
+    }
+
+    close(newfd); // Close the new fd, as dup2 has replaced the original fd with it
+}
+#endif
+
+
+
+/***
+Creates new file descriptions for `stdout` and `stderr`.
+Even if the file descriptors are unique, they still might point to the same
+file description, and hence share settings like `O_NONBLOCK`. This means that
+if one of them is set to non-blocking, the other will be as well. This can
+lead to unexpected behavior.
+
+This function is used to detach `stdout` and `stderr` from the original
+file descriptions, and create new file descriptions for them. This allows
+independent control of flags (e.g., `O_NONBLOCK`) on `stdout` and `stderr`,
+avoiding shared side effects.
+
+Does not modify `stdin` (fd 0), and does nothing on Windows.
+@function detachfds
+@return boolean `true` on success, or throws an error on failure.
+@see setnonblock
+*/
+static int lst_detachfds(lua_State *L) {
+    static int already_detached = 0; // detaching is once per process(not per thread or Lua state)
+    if (already_detached) {
+        lua_pushnil(L);
+        lua_pushliteral(L, "stdout and stderr already detached");
+        return 1;
+    }
+    already_detached = 1;
+
+#ifndef _WIN32
+    // Reopen stdout and stderr with new file descriptions
+    reopen_fd(L, STDOUT_FILENO, O_WRONLY);
+    reopen_fd(L, STDERR_FILENO, O_WRONLY);
+#endif
+
+    lua_pushboolean(L, 1);
+    return 1;
+}
+
+
+
 /***
 Enables or disables non-blocking mode for a file (Posix).
+Check `detachfds` in case there are shared file descriptions.
 @function setnonblock
 @tparam file fd file handle to operate on, one of `io.stdin`, `io.stdout`, `io.stderr`
 @tparam boolean make_non_block a truthy value will enable non-blocking mode, a falsy value will disable it.
@@ -659,8 +755,10 @@ Enables or disables non-blocking mode for a file (Posix).
 @treturn[2] string error message
 @treturn[2] int errnum
 @see getnonblock
+@see detachfds
 @usage
 local sys = require('system')
+sys.detachfds() -- detach stdout and stderr, so only stdin becomes non-blocking
 
 -- set io.stdin to non-blocking mode
 local old_setting = sys.getnonblock(io.stdin)
@@ -717,6 +815,7 @@ Gets non-blocking mode status for a file (Posix).
 @treturn[2] nil
 @treturn[2] string error message
 @treturn[2] int errnum
+@see setnonblock
 */
 static int lst_getnonblock(lua_State *L)
 {
@@ -1157,6 +1256,7 @@ static luaL_Reg func[] = {
     { "setconsoleflags", lst_setconsoleflags },
     { "tcgetattr", lst_tcgetattr },
     { "tcsetattr", lst_tcsetattr },
+    { "detachfds", lst_detachfds },
     { "getnonblock", lst_getnonblock },
     { "setnonblock", lst_setnonblock },
     { "_readkey", lst_readkey },
diff --git a/system/init.lua b/system/init.lua
index a81978e..a9f57e9 100644
--- a/system/init.lua
+++ b/system/init.lua
@@ -13,14 +13,16 @@ local system = require 'system.core'
 system.CODEPAGE_UTF8 = 65001
 
 do
-  local backup_mt = {}
+  local backup_indicator = {}
 
   --- Returns a backup of terminal settings for stdin/out/err.
   -- Handles terminal/console flags, Windows codepage, and non-block flags on the streams.
   -- Backs up terminal/console flags only if a stream is a tty.
   -- @return table with backup of terminal settings
   function system.termbackup()
-    local backup = setmetatable({}, backup_mt)
+    local backup = {
+      __type = backup_indicator, -- cannot set a metatable, since autotermrestore uses it for GC
+    }
 
     if system.isatty(io.stdin) then
       backup.console_in = system.getconsoleflags(io.stdin)
@@ -51,7 +53,7 @@ do
   -- @tparam table backup the backup of terminal settings, see `termbackup`.
   -- @treturn boolean true
   function system.termrestore(backup)
-    if getmetatable(backup) ~= backup_mt then
+    if type(backup) ~= "table" or backup.__type ~= backup_indicator then
       error("arg #1 to termrestore, expected backup table, got " .. type(backup), 2)
     end
 
@@ -236,10 +238,10 @@ do
   -- Using `system.readansi` is preferred over this function. Since this function can leave stray/invalid
   -- byte-sequences in the input buffer, while `system.readansi` reads full ANSI and UTF8 sequences.
   -- @tparam number timeout the timeout in seconds.
-  -- @tparam[opt=system.sleep] function fsleep the function to call for sleeping.
+  -- @tparam[opt=system.sleep] function fsleep the function to call for sleeping; `ok, err = fsleep(secs)`
   -- @treturn[1] byte the byte value that was read.
   -- @treturn[2] nil if no key was read
-  -- @treturn[2] string error message; `"timeout"` if the timeout was reached.
+  -- @treturn[2] string error message when the timeout was reached (`"timeout"`), or if `sleep` failed.
   function system.readkey(timeout, fsleep)
     if type(timeout) ~= "number" then
       error("arg #1 to readkey, expected timeout in seconds, got " .. type(timeout), 2)
@@ -248,7 +250,10 @@ do
     local interval = 0.0125
     local key = system._readkey()
     while key == nil and timeout > 0 do
-      (fsleep or system.sleep)(math.min(interval, timeout))
+      local ok, err = (fsleep or system.sleep)(math.min(interval, timeout))
+      if not ok then
+        return nil, err
+      end
       timeout = timeout - interval
       interval = math.min(0.2, interval * 2)
       key = system._readkey()
@@ -264,7 +269,6 @@ end
 
 
 do
-  local left_over_key
   local sequence -- table to store the sequence in progress
   local utf8_length -- length of utf8 sequence currently being processed
   local unpack = unpack or table.unpack
@@ -282,6 +286,8 @@ do
   -- @treturn[2] nil in case of an error
   -- @treturn[2] string error message; `"timeout"` if the timeout was reached.
   -- @treturn[2] string partial result in case of an error while reading a sequence, the sequence so far.
+  -- The function retains its own internal buffer, so on the next call the incomplete buffer is used to
+  -- complete the sequence.
   function system.readansi(timeout, fsleep)
     if type(timeout) ~= "number" then
       error("arg #1 to readansi, expected timeout in seconds, got " .. type(timeout), 2)
@@ -292,33 +298,47 @@ do
 
     if not sequence then
       -- no sequence in progress, read a key
-
-      if left_over_key then
-        -- we still have a cached key from the last call
-        key = left_over_key
-        left_over_key = nil
-      else
-        -- read a new key
-        local err
-        key, err = system.readkey(timeout, fsleep)
-        if key == nil then -- timeout or error
-          return nil, err
-        end
+      local err
+      key, err = system.readkey(timeout, fsleep)
+      if key == nil then -- timeout or error
+        return nil, err
       end
 
       if key == 27 then
         -- looks like an ansi escape sequence, immediately read next char
         -- as an heuristic against manually typing escape sequences
         local key2 = system.readkey(0, fsleep)
-        if key2 ~= 91 and key2 ~= 79 then -- we expect either "[" or "O" for an ANSI sequence
-          -- not the expected [ or O character, so we return the key as is
-          -- and store the extra key read for the next call
-          left_over_key = key2
+        if key2 == nil then
+          -- no key available, return the escape key, on its own
+          sequence = nil
           return string.char(key), "char"
+
+        elseif key2 == 91 then
+          -- "[" means it is for sure an ANSI sequence
+          sequence = { key, key2 }
+
+        elseif key2 == 79 then
+          -- "O" means it is either an ANSI sequence or just an <alt>+O key stroke
+          -- check if there is yet another byte available
+          local key3 = system.readkey(0, fsleep)
+          if key3 == nil then
+            -- no key available, return the <alt>O key stroke, report as ANSI
+            sequence = nil
+            return string.char(key, key2), "ansi"
+          end
+          -- it's an ANSI sequence, marked with <ESC>O
+          if (key3 >= 65 and key3 <= 90) or (key3 >= 97 and key3 <= 126) then
+            -- end of sequence, return the full sequence
+            return string.char(key, key2, key3), "ansi"
+          end
+          sequence = { key, key2, key3 }
+
+        else
+          -- not an ANSI sequence, but an <alt>+<key2> key stroke, so report as ANSI
+          sequence = nil
+          return string.char(key, key2), "ansi"
         end
 
-        -- escape sequence detected
-        sequence = { key, key2 }
       else
         -- check UTF8 length
         utf8_length = key < 128 and 1 or key < 224 and 2 or key < 240 and 3 or key < 248 and 4