fix(permissions): lock stdio streams when prompt is shown (#17392)

This commit changes permission prompt to lock stdio streams when prompt
is shown.

1 files changed, 8 insertions, 0 deletions

diff --git a/runtime/permissions/prompter.rs b/runtime/permissions/prompter.rs
index a73898835..ae07e004c 100644
--- a/runtime/permissions/prompter.rs
+++ b/runtime/permissions/prompter.rs
@@ -192,6 +192,11 @@ impl PermissionPrompter for TtyPrompter {
       return PromptResponse::Deny; // don't grant permission if this fails
     }
 
+    // Lock stdio streams, so no other output is written while the prompt is
+    // displayed.
+    let _stdout_guard = std::io::stdout().lock();
+    let _stderr_guard = std::io::stderr().lock();
+
     // print to stderr so that if stdout is piped this is still displayed.
     const OPTS: &str = "[y/n] (y = yes, allow; n = no, deny)";
     eprint!("{}  ┌ ", PERMISSION_EMOJI);
@@ -238,6 +243,9 @@ impl PermissionPrompter for TtyPrompter {
       };
     };
 
+    drop(_stdout_guard);
+    drop(_stderr_guard);
+
     value
   }
 }