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Avoid leaving stdin in nonblocking mode after a modern prompt
Summary: Ref T13649. Currently, "arc" may leave stdin nonblocking after showing a prompt. This can cause various odd behaviors down the line. I can't immediately reproduce this behavior on macOS in "zsh" or "bash" (I'm unable to get stdin to remain nonblocking beyond the process lifespan), and also don't have pcntl locally so there's a fair amount of handwaving here. Test Plan: This is somewhat speculative since I can't immediately reproduce the behavior. I tested the locally-reachable paths (no pcntl) but they're not interesting. Maniphest Tasks: T13649 Differential Revision: https://secure.phabricator.com/D21666
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3 changed files with 61 additions and 10 deletions
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@ -378,6 +378,7 @@ phutil_register_library_map(array(
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'ArcanistNoParentScopeXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistNoParentScopeXHPASTLinterRule.php',
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'ArcanistNoParentScopeXHPASTLinterRuleTestCase' => 'lint/linter/xhpast/rules/__tests__/ArcanistNoParentScopeXHPASTLinterRuleTestCase.php',
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'ArcanistNoURIConduitException' => 'conduit/ArcanistNoURIConduitException.php',
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'ArcanistNonblockingGuard' => 'utils/ArcanistNonblockingGuard.php',
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'ArcanistNoneLintRenderer' => 'lint/renderer/ArcanistNoneLintRenderer.php',
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'ArcanistObjectListHardpoint' => 'hardpoint/ArcanistObjectListHardpoint.php',
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'ArcanistObjectOperatorSpacingXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistObjectOperatorSpacingXHPASTLinterRule.php',
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@ -1434,6 +1435,7 @@ phutil_register_library_map(array(
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'ArcanistNoParentScopeXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
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'ArcanistNoParentScopeXHPASTLinterRuleTestCase' => 'ArcanistXHPASTLinterRuleTestCase',
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'ArcanistNoURIConduitException' => 'ArcanistConduitException',
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'ArcanistNonblockingGuard' => 'Phobject',
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'ArcanistNoneLintRenderer' => 'ArcanistLintRenderer',
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'ArcanistObjectListHardpoint' => 'ArcanistHardpoint',
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'ArcanistObjectOperatorSpacingXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
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@ -93,16 +93,9 @@ final class ArcanistPrompt
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// NOTE: We're making stdin nonblocking so that we can respond to signals
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// immediately. If we don't, and you ^C during a prompt, the program does
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// not handle the signal until fgets() returns.
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// not handle the signal until fgets() returns. See also T13649.
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// On Windows, we skip this because stdin can not be made nonblocking.
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if (!phutil_is_windows()) {
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$ok = stream_set_blocking($stdin, false);
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if (!$ok) {
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throw new Exception(pht('Unable to set stdin nonblocking.'));
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}
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}
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$guard = ArcanistNonblockingGuard::newForStream($stdin);
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echo "\n";
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@ -123,7 +116,7 @@ final class ArcanistPrompt
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$is_saved = false;
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if (phutil_is_windows()) {
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if (!$guard->getIsNonblocking()) {
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$response = fgets($stdin);
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} else {
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while (true) {
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56
src/utils/ArcanistNonblockingGuard.php
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56
src/utils/ArcanistNonblockingGuard.php
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@ -0,0 +1,56 @@
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<?php
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final class ArcanistNonblockingGuard
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extends Phobject {
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private $stream;
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private $didSetNonblocking;
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public static function newForStream($stream) {
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$guard = new self();
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$guard->stream = $stream;
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if (phutil_is_windows()) {
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// On Windows, we skip this because stdin can not be made nonblocking.
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} else if (!function_exists('pcntl_signal')) {
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// If we can't handle signals, we: can't reset the flag if we're
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// interrupted; but also don't benefit from setting it in the first
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// place since it's only relevant for handling interrupts during
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// prompts. So just skip this.
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} else {
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// See T13649. Note that the "blocked" key identifies whether the
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// stream is blocking or nonblocking, not whether it will block when
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// read or written.
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$metadata = stream_get_meta_data($stream);
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$is_blocking = idx($metadata, 'blocked');
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if ($is_blocking) {
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$ok = stream_set_blocking($stream, false);
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if (!$ok) {
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throw new Exception(pht('Unable to set stream nonblocking.'));
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}
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$guard->didSetNonblocking = true;
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}
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}
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return $guard;
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}
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public function getIsNonblocking() {
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return $this->didSetNonblocking;
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}
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public function __destruct() {
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if ($this->stream && $this->didSetNonblocking) {
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stream_set_blocking($this->stream, true);
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}
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$this->stream = null;
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}
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}
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