Return immediately when FD_SETSIZE is exceeded #9602
Conversation
github-actions
bot
added
Extension: mysqlnd
Extension: sockets
Extension: standard
labels
| posix_setrlimit(POSIX_RLIMIT_NOFILE, 2048, -1); | ||
|
|
||
| $fds = []; | ||
| for ($i = 0; $i < 1023; $i++) { | ||
| $fds[] = @fopen(__DIR__ . "/GH-9590-tmpfile.$i", 'w'); | ||
| } | ||
|
|
||
| require_once('connect.inc'); | ||
|
|
||
| function get_connection() { | ||
| global $host, $user, $passwd, $db, $port, $socket; | ||
|
|
||
| if (!$link = my_mysqli_connect($host, $user, $passwd, $db, $port, $socket)) | ||
| printf("[001] [%d] %s\n", mysqli_connect_errno(), mysqli_connect_error()); | ||
| return $link; | ||
| } | ||
|
|
||
|
|
||
| $mysqli1 = get_connection(); | ||
| $mysqli2 = get_connection(); | ||
|
|
||
| var_dump(mysqli_query($mysqli1, "SELECT SLEEP(0.10)", MYSQLI_ASYNC | MYSQLI_USE_RESULT)); | ||
| var_dump(mysqli_query($mysqli2, "SELECT SLEEP(0.20)", MYSQLI_ASYNC | MYSQLI_USE_RESULT)); | ||
|
|
||
| $links = $errors = $reject = array($mysqli1, $mysqli2); | ||
| var_dump(mysqli_poll($links, $errors, $reject, 0, 50000)); | ||
|
|
||
| mysqli_close($mysqli1); | ||
| mysqli_close($mysqli2); | ||
|
|
||
| print "done!"; |
There was a problem hiding this comment.
Many tests in this directory are like that, I tried to keep the existing style
|
I guess just always returning is the easiest thing to do :-) I'm not sure whether it's better to generally allow graceful handling or just return, but I'm fine with this too. |
Co-authored-by: Jakub Zelenka <bukka@php.net>
Co-authored-by: Jakub Zelenka <bukka@php.net>
|
@bwoebi I'm open to suggestions. Do you have a solution in mind to handle this gracefully ? Currently this change causes select() to return false when FD_SETSIZE is exceeded instead of hanging forever. |
|
The other option is to just return when an exception is thrown or when the fd set is empty. But I'm not sure whether that's better. |
|
I have a preference for just returning when an exception is thrown, or for always returning when FD_SETSIZE is exceeded, over returning only when the fd set is empty. In the latter, the user may be under the impression that select() actually works despite the warning, because select() will monitor some FDs, but some others will not actually be monitored. Returning only when an exception is thrown has the advantage of making the least behavioral changes while still fixing the original bug. Returning when FD_SETSIZE also prevents hanging forever (in the case where the set is empty), and makes the problem more visible (if the warning is not spotted already). |
|
Fine by me :-) |
* PHP-8.0: [ci skip] NEWS Return immediately when FD_SETSIZE is exceeded (php#9602)
* PHP-8.1: [ci skip] NEWS [ci skip] NEWS Return immediately when FD_SETSIZE is exceeded (#9602)
* PHP-8.2: [ci skip] NEWS [ci skip] NEWS [ci skip] NEWS Return immediately when FD_SETSIZE is exceeded (#9602)
Fixes #9590