bug #49604 [Mailer] STDOUT blocks infinitely under Windows when STDERR is filled (TemaYud)

nicolas-grekas · nicolas-grekas · commit 626954d130cf · 2023-03-10T11:15:41.000+01:00
This PR was submitted for the 6.2 branch but it was squashed and merged into the 5.4 branch instead. Discussion ---------- [Mailer] STDOUT blocks infinitely under Windows when STDERR is filled | Q | A | ------------- | --- | Branch? | 6.2 | Bug fix? | yes | New feature? | no | Deprecations? | no | Tickets | Fix #...  | License | MIT | Doc PR | symfony/symfony-docs#...  stream_get_contents() on STDOUT blocks infinitely under Windows when STDERR is filled under some circumstances. Open STDERR in append mode ("a"), then this will work. Commits ------- 2641438 [Mailer] STDOUT blocks infinitely under Windows when STDERR is filled
diff --git a/src/Symfony/Component/Mailer/Transport/Smtp/Stream/ProcessStream.php b/src/Symfony/Component/Mailer/Transport/Smtp/Stream/ProcessStream.php
@@ -35,7 +35,7 @@ public function initialize(): void
         $descriptorSpec = [
             0 => ['pipe', 'r'],
             1 => ['pipe', 'w'],
-            2 => ['pipe', 'w'],
+            2 => ['pipe', '\\' === \DIRECTORY_SEPARATOR ? 'a' : 'w'],
         ];
         $pipes = [];
         $this->stream = proc_open($this->command, $descriptorSpec, $pipes);
