runtime: flush stdout and stderr file descriptors at exit - #38

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gf712 merged 8 commits into
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fix-buffer-flush
Jul 28, 2026
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runtime: flush stdout and stderr file descriptors at exit#38
gf712 merged 8 commits into
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fix-buffer-flush

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Comment threadsrc/executable/bytecode/BytecodeProgram.cpp Outdated
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 2 new issues — see the inline comments.

Comment threadsrc/executable/bytecode/BytecodeProgram.cpp
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Found 2 new issues — see the inline comments.

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gf712force-pushed the fix-buffer-flush branch from 0b2dff6 to efcfb85CompareJuly 27, 2026 12:21
Comment threadsrc/runtime/modules/IOModule.cpp
Comment threadsrc/runtime/modules/IOModule.cpp Outdated
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 3 new issues — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from efcfb85 to 306cd11CompareJuly 27, 2026 13:45
Comment threadintegration/run_python_tests.sh
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Found 1 new issue — see the inline comment.

@gf712
gf712force-pushed the fix-buffer-flush branch from 306cd11 to 81b0d4fCompareJuly 27, 2026 14:06
Comment threadsrc/runtime/modules/IOModule.cpp Outdated
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Found 1 new issue — see the inline comments.

Comment on lines +3334 to +3339
PyResult<PyObject *> isatty()
{
return m_buffer->get_method(PyString::create("isatty").unwrap()).and_then([](auto *isatty) {
return isatty->call(nullptr, nullptr);
});
}

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isatty() dereferences m_buffer with no initialization check (bug)

m_buffer is only set in init(), and TextIOWrapper.__new__ allocates without initializing it, so _io.TextIOWrapper.__new__(_io.TextIOWrapper).isatty() (or type(sys.stdout).__new__(type(sys.stdout)).isatty()) null-derefs and crashes. Previously isatty() resolved to the inherited IOBase::isatty, which safely returns False after a check_closed() — so this is a new crash path on a call that was previously safe, not just a pre-existing hazard. BufferedWriter in this same PR guards the analogous case via check_initialized().

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Found 1 new issue — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from b9c384b to e97e80cCompareJuly 28, 2026 19:24
Comment on lines +536 to +543
PyResult<std::monostate> Interpreter::finalise()
{
// TODO: capture exceptions, and raise last one
for (auto [callback, args] : m_callbacks) {
[[maybe_unused]] auto result = callback->call(args, nullptr);
}

return Ok(std::monostate{});

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finalise() discards the result of every exit callback ([[maybe_unused]] auto result = ...) and always returns Ok. The caller in BytecodeProgram.cpp also discards finalise()'s return value, so the process exit code depends only on the main function's result. Since this same PR makes print() default to flush=False and ties sys.stdout line-buffering to isatty(), a flush failure during exit (e.g. EPIPE on a closed pipe, ENOSPC) is now silently swallowed instead of surfacing as a Python error — output can be silently truncated while the process still exits 0. (bug)

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Found 1 new issue — see the inline comment.

@gf712
gf712 merged commit 74079d9 into mainJul 28, 2026
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@gf712
gf712 deleted the fix-buffer-flush branch July 28, 2026 19:42
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
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runtime: flush stdout and stderr file descriptors at exit - #38

Merged
gf712 merged 8 commits into
mainfrom
fix-buffer-flush
Jul 28, 2026
Merged

runtime: flush stdout and stderr file descriptors at exit#38
gf712 merged 8 commits into
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fix-buffer-flush

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Comment threadsrc/executable/bytecode/BytecodeProgram.cpp Outdated
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 2 new issues — see the inline comments.

Comment threadsrc/executable/bytecode/BytecodeProgram.cpp
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 2 new issues — see the inline comments.

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gf712force-pushed the fix-buffer-flush branch from 0b2dff6 to efcfb85CompareJuly 27, 2026 12:21
Comment threadsrc/runtime/modules/IOModule.cpp
Comment threadsrc/runtime/modules/IOModule.cpp Outdated
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 3 new issues — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from efcfb85 to 306cd11CompareJuly 27, 2026 13:45
Comment threadintegration/run_python_tests.sh
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Found 1 new issue — see the inline comment.

@gf712
gf712force-pushed the fix-buffer-flush branch from 306cd11 to 81b0d4fCompareJuly 27, 2026 14:06
Comment threadsrc/runtime/modules/IOModule.cpp Outdated
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Found 1 new issue — see the inline comments.

Comment on lines +3334 to +3339
PyResult<PyObject *> isatty()
{
return m_buffer->get_method(PyString::create("isatty").unwrap()).and_then([](auto *isatty) {
return isatty->call(nullptr, nullptr);
});
}

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isatty() dereferences m_buffer with no initialization check (bug)

m_buffer is only set in init(), and TextIOWrapper.__new__ allocates without initializing it, so _io.TextIOWrapper.__new__(_io.TextIOWrapper).isatty() (or type(sys.stdout).__new__(type(sys.stdout)).isatty()) null-derefs and crashes. Previously isatty() resolved to the inherited IOBase::isatty, which safely returns False after a check_closed() — so this is a new crash path on a call that was previously safe, not just a pre-existing hazard. BufferedWriter in this same PR guards the analogous case via check_initialized().

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Code review

Found 1 new issue — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from b9c384b to e97e80cCompareJuly 28, 2026 19:24
Comment on lines +536 to +543
PyResult<std::monostate> Interpreter::finalise()
{
// TODO: capture exceptions, and raise last one
for (auto [callback, args] : m_callbacks) {
[[maybe_unused]] auto result = callback->call(args, nullptr);
}

return Ok(std::monostate{});

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finalise() discards the result of every exit callback ([[maybe_unused]] auto result = ...) and always returns Ok. The caller in BytecodeProgram.cpp also discards finalise()'s return value, so the process exit code depends only on the main function's result. Since this same PR makes print() default to flush=False and ties sys.stdout line-buffering to isatty(), a flush failure during exit (e.g. EPIPE on a closed pipe, ENOSPC) is now silently swallowed instead of surfacing as a Python error — output can be silently truncated while the process still exits 0. (bug)

@claude

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Code review

Found 1 new issue — see the inline comment.

@gf712
gf712 merged commit 74079d9 into mainJul 28, 2026
4 checks passed
@gf712
gf712 deleted the fix-buffer-flush branch July 28, 2026 19:42
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix"); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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runtime: flush stdout and stderr file descriptors at exit - #38

Merged
gf712 merged 8 commits into
mainfrom
fix-buffer-flush
Jul 28, 2026
Merged

runtime: flush stdout and stderr file descriptors at exit#38
gf712 merged 8 commits into
mainfrom
fix-buffer-flush

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Comment threadsrc/executable/bytecode/BytecodeProgram.cpp Outdated
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 2 new issues — see the inline comments.

Comment threadsrc/executable/bytecode/BytecodeProgram.cpp
Comment threadsrc/runtime/modules/IOModule.cpp
@claude

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Found 2 new issues — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from 0b2dff6 to efcfb85CompareJuly 27, 2026 12:21
Comment threadsrc/runtime/modules/IOModule.cpp
Comment threadsrc/runtime/modules/IOModule.cpp Outdated
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 3 new issues — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from efcfb85 to 306cd11CompareJuly 27, 2026 13:45
Comment threadintegration/run_python_tests.sh
@claude

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Found 1 new issue — see the inline comment.

@gf712
gf712force-pushed the fix-buffer-flush branch from 306cd11 to 81b0d4fCompareJuly 27, 2026 14:06
Comment threadsrc/runtime/modules/IOModule.cpp Outdated
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Found 1 new issue — see the inline comments.

Comment on lines +3334 to +3339
PyResult<PyObject *> isatty()
{
return m_buffer->get_method(PyString::create("isatty").unwrap()).and_then([](auto *isatty) {
return isatty->call(nullptr, nullptr);
});
}

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isatty() dereferences m_buffer with no initialization check (bug)

m_buffer is only set in init(), and TextIOWrapper.__new__ allocates without initializing it, so _io.TextIOWrapper.__new__(_io.TextIOWrapper).isatty() (or type(sys.stdout).__new__(type(sys.stdout)).isatty()) null-derefs and crashes. Previously isatty() resolved to the inherited IOBase::isatty, which safely returns False after a check_closed() — so this is a new crash path on a call that was previously safe, not just a pre-existing hazard. BufferedWriter in this same PR guards the analogous case via check_initialized().

@claude

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Code review

Found 1 new issue — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from b9c384b to e97e80cCompareJuly 28, 2026 19:24
Comment on lines +536 to +543
PyResult<std::monostate> Interpreter::finalise()
{
// TODO: capture exceptions, and raise last one
for (auto [callback, args] : m_callbacks) {
[[maybe_unused]] auto result = callback->call(args, nullptr);
}

return Ok(std::monostate{});

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finalise() discards the result of every exit callback ([[maybe_unused]] auto result = ...) and always returns Ok. The caller in BytecodeProgram.cpp also discards finalise()'s return value, so the process exit code depends only on the main function's result. Since this same PR makes print() default to flush=False and ties sys.stdout line-buffering to isatty(), a flush failure during exit (e.g. EPIPE on a closed pipe, ENOSPC) is now silently swallowed instead of surfacing as a Python error — output can be silently truncated while the process still exits 0. (bug)

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Code review

Found 1 new issue — see the inline comment.

@gf712
gf712 merged commit 74079d9 into mainJul 28, 2026
4 checks passed
@gf712
gf712 deleted the fix-buffer-flush branch July 28, 2026 19:42
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms"); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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runtime: flush stdout and stderr file descriptors at exit - #38

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gf712 merged 8 commits into
mainfrom
fix-buffer-flush
Jul 28, 2026
Merged

runtime: flush stdout and stderr file descriptors at exit#38
gf712 merged 8 commits into
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fix-buffer-flush

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Comment threadsrc/executable/bytecode/BytecodeProgram.cpp Outdated
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 2 new issues — see the inline comments.

Comment threadsrc/executable/bytecode/BytecodeProgram.cpp
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 2 new issues — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from 0b2dff6 to efcfb85CompareJuly 27, 2026 12:21
Comment threadsrc/runtime/modules/IOModule.cpp
Comment threadsrc/runtime/modules/IOModule.cpp Outdated
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 3 new issues — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from efcfb85 to 306cd11CompareJuly 27, 2026 13:45
Comment threadintegration/run_python_tests.sh
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Found 1 new issue — see the inline comment.

@gf712
gf712force-pushed the fix-buffer-flush branch from 306cd11 to 81b0d4fCompareJuly 27, 2026 14:06
Comment threadsrc/runtime/modules/IOModule.cpp Outdated
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Found 1 new issue — see the inline comments.

Comment on lines +3334 to +3339
PyResult<PyObject *> isatty()
{
return m_buffer->get_method(PyString::create("isatty").unwrap()).and_then([](auto *isatty) {
return isatty->call(nullptr, nullptr);
});
}

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isatty() dereferences m_buffer with no initialization check (bug)

m_buffer is only set in init(), and TextIOWrapper.__new__ allocates without initializing it, so _io.TextIOWrapper.__new__(_io.TextIOWrapper).isatty() (or type(sys.stdout).__new__(type(sys.stdout)).isatty()) null-derefs and crashes. Previously isatty() resolved to the inherited IOBase::isatty, which safely returns False after a check_closed() — so this is a new crash path on a call that was previously safe, not just a pre-existing hazard. BufferedWriter in this same PR guards the analogous case via check_initialized().

@claude

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Code review

Found 1 new issue — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from b9c384b to e97e80cCompareJuly 28, 2026 19:24
Comment on lines +536 to +543
PyResult<std::monostate> Interpreter::finalise()
{
// TODO: capture exceptions, and raise last one
for (auto [callback, args] : m_callbacks) {
[[maybe_unused]] auto result = callback->call(args, nullptr);
}

return Ok(std::monostate{});

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finalise() discards the result of every exit callback ([[maybe_unused]] auto result = ...) and always returns Ok. The caller in BytecodeProgram.cpp also discards finalise()'s return value, so the process exit code depends only on the main function's result. Since this same PR makes print() default to flush=False and ties sys.stdout line-buffering to isatty(), a flush failure during exit (e.g. EPIPE on a closed pipe, ENOSPC) is now silently swallowed instead of surfacing as a Python error — output can be silently truncated while the process still exits 0. (bug)

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Code review

Found 1 new issue — see the inline comment.

@gf712
gf712 merged commit 74079d9 into mainJul 28, 2026
4 checks passed
@gf712
gf712 deleted the fix-buffer-flush branch July 28, 2026 19:42
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links"); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + '
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runtime: flush stdout and stderr file descriptors at exit - #38

Merged
gf712 merged 8 commits into
mainfrom
fix-buffer-flush
Jul 28, 2026
Merged

runtime: flush stdout and stderr file descriptors at exit#38
gf712 merged 8 commits into
mainfrom
fix-buffer-flush

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Comment threadsrc/runtime/modules/IOModule.cpp
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Found 2 new issues — see the inline comments.

Comment threadsrc/executable/bytecode/BytecodeProgram.cpp
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 2 new issues — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from 0b2dff6 to efcfb85CompareJuly 27, 2026 12:21
Comment threadsrc/runtime/modules/IOModule.cpp
Comment threadsrc/runtime/modules/IOModule.cpp Outdated
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 3 new issues — see the inline comments.

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Comment threadintegration/run_python_tests.sh
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Found 1 new issue — see the inline comment.

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gf712force-pushed the fix-buffer-flush branch from 306cd11 to 81b0d4fCompareJuly 27, 2026 14:06
Comment threadsrc/runtime/modules/IOModule.cpp Outdated
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Found 1 new issue — see the inline comments.

Comment on lines +3334 to +3339
PyResult<PyObject *> isatty()
{
return m_buffer->get_method(PyString::create("isatty").unwrap()).and_then([](auto *isatty) {
return isatty->call(nullptr, nullptr);
});
}

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isatty() dereferences m_buffer with no initialization check (bug)

m_buffer is only set in init(), and TextIOWrapper.__new__ allocates without initializing it, so _io.TextIOWrapper.__new__(_io.TextIOWrapper).isatty() (or type(sys.stdout).__new__(type(sys.stdout)).isatty()) null-derefs and crashes. Previously isatty() resolved to the inherited IOBase::isatty, which safely returns False after a check_closed() — so this is a new crash path on a call that was previously safe, not just a pre-existing hazard. BufferedWriter in this same PR guards the analogous case via check_initialized().

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Code review

Found 1 new issue — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from b9c384b to e97e80cCompareJuly 28, 2026 19:24
Comment on lines +536 to +543
PyResult<std::monostate> Interpreter::finalise()
{
// TODO: capture exceptions, and raise last one
for (auto [callback, args] : m_callbacks) {
[[maybe_unused]] auto result = callback->call(args, nullptr);
}

return Ok(std::monostate{});

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finalise() discards the result of every exit callback ([[maybe_unused]] auto result = ...) and always returns Ok. The caller in BytecodeProgram.cpp also discards finalise()'s return value, so the process exit code depends only on the main function's result. Since this same PR makes print() default to flush=False and ties sys.stdout line-buffering to isatty(), a flush failure during exit (e.g. EPIPE on a closed pipe, ENOSPC) is now silently swallowed instead of surfacing as a Python error — output can be silently truncated while the process still exits 0. (bug)

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Found 1 new issue — see the inline comment.

@gf712
gf712 merged commit 74079d9 into mainJul 28, 2026
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@gf712
gf712 deleted the fix-buffer-flush branch July 28, 2026 19:42
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default"); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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runtime: flush stdout and stderr file descriptors at exit - #38

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gf712 merged 8 commits into
mainfrom
fix-buffer-flush
Jul 28, 2026
Merged

runtime: flush stdout and stderr file descriptors at exit#38
gf712 merged 8 commits into
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fix-buffer-flush

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Comment threadsrc/executable/bytecode/BytecodeProgram.cpp Outdated
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 2 new issues — see the inline comments.

Comment threadsrc/executable/bytecode/BytecodeProgram.cpp
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 2 new issues — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from 0b2dff6 to efcfb85CompareJuly 27, 2026 12:21
Comment threadsrc/runtime/modules/IOModule.cpp
Comment threadsrc/runtime/modules/IOModule.cpp Outdated
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 3 new issues — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from efcfb85 to 306cd11CompareJuly 27, 2026 13:45
Comment threadintegration/run_python_tests.sh
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Found 1 new issue — see the inline comment.

@gf712
gf712force-pushed the fix-buffer-flush branch from 306cd11 to 81b0d4fCompareJuly 27, 2026 14:06
Comment threadsrc/runtime/modules/IOModule.cpp Outdated
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Found 1 new issue — see the inline comments.

Comment on lines +3334 to +3339
PyResult<PyObject *> isatty()
{
return m_buffer->get_method(PyString::create("isatty").unwrap()).and_then([](auto *isatty) {
return isatty->call(nullptr, nullptr);
});
}

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isatty() dereferences m_buffer with no initialization check (bug)

m_buffer is only set in init(), and TextIOWrapper.__new__ allocates without initializing it, so _io.TextIOWrapper.__new__(_io.TextIOWrapper).isatty() (or type(sys.stdout).__new__(type(sys.stdout)).isatty()) null-derefs and crashes. Previously isatty() resolved to the inherited IOBase::isatty, which safely returns False after a check_closed() — so this is a new crash path on a call that was previously safe, not just a pre-existing hazard. BufferedWriter in this same PR guards the analogous case via check_initialized().

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Code review

Found 1 new issue — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from b9c384b to e97e80cCompareJuly 28, 2026 19:24
Comment on lines +536 to +543
PyResult<std::monostate> Interpreter::finalise()
{
// TODO: capture exceptions, and raise last one
for (auto [callback, args] : m_callbacks) {
[[maybe_unused]] auto result = callback->call(args, nullptr);
}

return Ok(std::monostate{});

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finalise() discards the result of every exit callback ([[maybe_unused]] auto result = ...) and always returns Ok. The caller in BytecodeProgram.cpp also discards finalise()'s return value, so the process exit code depends only on the main function's result. Since this same PR makes print() default to flush=False and ties sys.stdout line-buffering to isatty(), a flush failure during exit (e.g. EPIPE on a closed pipe, ENOSPC) is now silently swallowed instead of surfacing as a Python error — output can be silently truncated while the process still exits 0. (bug)

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Code review

Found 1 new issue — see the inline comment.

@gf712
gf712 merged commit 74079d9 into mainJul 28, 2026
4 checks passed
@gf712
gf712 deleted the fix-buffer-flush branch July 28, 2026 19:42
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers"); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + '
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runtime: flush stdout and stderr file descriptors at exit - #38

Merged
gf712 merged 8 commits into
mainfrom
fix-buffer-flush
Jul 28, 2026
Merged

runtime: flush stdout and stderr file descriptors at exit#38
gf712 merged 8 commits into
mainfrom
fix-buffer-flush

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Comment threadsrc/executable/bytecode/BytecodeProgram.cpp Outdated
Comment threadsrc/runtime/modules/IOModule.cpp
@claude

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Code review

Found 2 new issues — see the inline comments.

Comment threadsrc/executable/bytecode/BytecodeProgram.cpp
Comment threadsrc/runtime/modules/IOModule.cpp
@claude

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Found 2 new issues — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from 0b2dff6 to efcfb85CompareJuly 27, 2026 12:21
Comment threadsrc/runtime/modules/IOModule.cpp
Comment threadsrc/runtime/modules/IOModule.cpp Outdated
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 3 new issues — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from efcfb85 to 306cd11CompareJuly 27, 2026 13:45
Comment threadintegration/run_python_tests.sh
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Found 1 new issue — see the inline comment.

@gf712
gf712force-pushed the fix-buffer-flush branch from 306cd11 to 81b0d4fCompareJuly 27, 2026 14:06
Comment threadsrc/runtime/modules/IOModule.cpp Outdated
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Code review

Found 1 new issue — see the inline comments.

Comment on lines +3334 to +3339
PyResult<PyObject *> isatty()
{
return m_buffer->get_method(PyString::create("isatty").unwrap()).and_then([](auto *isatty) {
return isatty->call(nullptr, nullptr);
});
}

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isatty() dereferences m_buffer with no initialization check (bug)

m_buffer is only set in init(), and TextIOWrapper.__new__ allocates without initializing it, so _io.TextIOWrapper.__new__(_io.TextIOWrapper).isatty() (or type(sys.stdout).__new__(type(sys.stdout)).isatty()) null-derefs and crashes. Previously isatty() resolved to the inherited IOBase::isatty, which safely returns False after a check_closed() — so this is a new crash path on a call that was previously safe, not just a pre-existing hazard. BufferedWriter in this same PR guards the analogous case via check_initialized().

@claude

claudeBot commented Jul 27, 2026

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Code review

Found 1 new issue — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from b9c384b to e97e80cCompareJuly 28, 2026 19:24
Comment on lines +536 to +543
PyResult<std::monostate> Interpreter::finalise()
{
// TODO: capture exceptions, and raise last one
for (auto [callback, args] : m_callbacks) {
[[maybe_unused]] auto result = callback->call(args, nullptr);
}

return Ok(std::monostate{});

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finalise() discards the result of every exit callback ([[maybe_unused]] auto result = ...) and always returns Ok. The caller in BytecodeProgram.cpp also discards finalise()'s return value, so the process exit code depends only on the main function's result. Since this same PR makes print() default to flush=False and ties sys.stdout line-buffering to isatty(), a flush failure during exit (e.g. EPIPE on a closed pipe, ENOSPC) is now silently swallowed instead of surfacing as a Python error — output can be silently truncated while the process still exits 0. (bug)

@claude

claudeBot commented Jul 28, 2026

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Code review

Found 1 new issue — see the inline comment.

@gf712
gf712 merged commit 74079d9 into mainJul 28, 2026
4 checks passed
@gf712
gf712 deleted the fix-buffer-flush branch July 28, 2026 19:42
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode"); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })();
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runtime: flush stdout and stderr file descriptors at exit - #38

Merged
gf712 merged 8 commits into
mainfrom
fix-buffer-flush
Jul 28, 2026
Merged

runtime: flush stdout and stderr file descriptors at exit#38
gf712 merged 8 commits into
mainfrom
fix-buffer-flush

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Comment threadsrc/executable/bytecode/BytecodeProgram.cpp Outdated
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 2 new issues — see the inline comments.

Comment threadsrc/executable/bytecode/BytecodeProgram.cpp
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 2 new issues — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from 0b2dff6 to efcfb85CompareJuly 27, 2026 12:21
Comment threadsrc/runtime/modules/IOModule.cpp
Comment threadsrc/runtime/modules/IOModule.cpp Outdated
Comment threadsrc/runtime/modules/IOModule.cpp
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Found 3 new issues — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from efcfb85 to 306cd11CompareJuly 27, 2026 13:45
Comment threadintegration/run_python_tests.sh
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Found 1 new issue — see the inline comment.

@gf712
gf712force-pushed the fix-buffer-flush branch from 306cd11 to 81b0d4fCompareJuly 27, 2026 14:06
Comment threadsrc/runtime/modules/IOModule.cpp Outdated
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Found 1 new issue — see the inline comments.

Comment on lines +3334 to +3339
PyResult<PyObject *> isatty()
{
return m_buffer->get_method(PyString::create("isatty").unwrap()).and_then([](auto *isatty) {
return isatty->call(nullptr, nullptr);
});
}

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isatty() dereferences m_buffer with no initialization check (bug)

m_buffer is only set in init(), and TextIOWrapper.__new__ allocates without initializing it, so _io.TextIOWrapper.__new__(_io.TextIOWrapper).isatty() (or type(sys.stdout).__new__(type(sys.stdout)).isatty()) null-derefs and crashes. Previously isatty() resolved to the inherited IOBase::isatty, which safely returns False after a check_closed() — so this is a new crash path on a call that was previously safe, not just a pre-existing hazard. BufferedWriter in this same PR guards the analogous case via check_initialized().

@claude

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Code review

Found 1 new issue — see the inline comments.

@gf712
gf712force-pushed the fix-buffer-flush branch from b9c384b to e97e80cCompareJuly 28, 2026 19:24
Comment on lines +536 to +543
PyResult<std::monostate> Interpreter::finalise()
{
// TODO: capture exceptions, and raise last one
for (auto [callback, args] : m_callbacks) {
[[maybe_unused]] auto result = callback->call(args, nullptr);
}

return Ok(std::monostate{});

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finalise() discards the result of every exit callback ([[maybe_unused]] auto result = ...) and always returns Ok. The caller in BytecodeProgram.cpp also discards finalise()'s return value, so the process exit code depends only on the main function's result. Since this same PR makes print() default to flush=False and ties sys.stdout line-buffering to isatty(), a flush failure during exit (e.g. EPIPE on a closed pipe, ENOSPC) is now silently swallowed instead of surfacing as a Python error — output can be silently truncated while the process still exits 0. (bug)

@claude

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Code review

Found 1 new issue — see the inline comment.

@gf712
gf712 merged commit 74079d9 into mainJul 28, 2026
4 checks passed
@gf712
gf712 deleted the fix-buffer-flush branch July 28, 2026 19:42
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