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When "arc" receives SIGWINCH or other signals during display of a prompt, recover

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Summary:
Ref T13546. Resizing the terminal window to send SIGWINCH, or other signals, may interrupt "stream_select()" with an error which upgrades to a RuntimeException.

When "stream_select()" fails, continue and test the stream itself.

Test Plan: Waited for a prompt, resized the window. Before patch: SIGWINCH interruption. After patch: undisturbed prompt.

Maniphest Tasks: T13546

Differential Revision: https://secure.phabricator.com/D21317
This commit is contained in:
epriestley 2020-06-05 13:08:58 -07:00
parent 0da395ffe4
commit 3ed81d35a2
1 changed files with 23 additions and 3 deletions
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26
src/toolset/ArcanistPrompt.php
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@ -113,12 +113,32 @@ final class ArcanistPrompt
$write = array();
$except = array();
$ok = stream_select($read, $write, $except, 1);
$ok = @stream_select($read, $write, $except, 1);
if ($ok === false) {
throw new Exception(pht('stream_select() failed!'));
// NOTE: We may be interrupted by a system call, particularly if
// the window is resized while a prompt is shown and the terminal
// sends SIGWINCH.
// If we are, just continue below and try to read from stdin. If
// we were interrupted, we should read nothing and continue
// normally. If the pipe is broken, the read should fail.
}
$response = '';
while (true) {
$bytes = fread($stdin, 8192);
if ($bytes === false) {
throw new Exception(
pht('fread() from stdin failed with an error.'));
}
if (!strlen($bytes)) {
break;
}
$response .= $bytes;
}
$response = fgets($stdin);
if (!strlen($response)) {
continue;
}