From 0fdfc2e1ff5a395fc68c3f8b0b26886dfc7741b5 Mon Sep 17 00:00:00 2001
From: Nicolas Dusart <nicolas@freedelity.be>
Date: Wed, 23 Oct 2024 15:14:03 +0200
Subject: [PATCH] handle EINTR return code from tcdrain to effectively block
 until flush is complete

---
 src/posix/tty.rs | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/posix/tty.rs b/src/posix/tty.rs
index fe7e849..41131fc 100644
--- a/src/posix/tty.rs
+++ b/src/posix/tty.rs
@@ -441,8 +441,13 @@ impl io::Write for TTYPort {
     }
 
     fn flush(&mut self) -> io::Result<()> {
-        nix::sys::termios::tcdrain(self.fd)
-            .map_err(|_| io::Error::new(io::ErrorKind::Other, "flush failed"))
+        loop {
+            return match nix::sys::termios::tcdrain(self.fd) {
+                Ok(_) => Ok(()),
+                Err(nix::errno::Errno::EINTR) => continue,
+                Err(_) => Err(io::Error::new(io::ErrorKind::Other, "flush failed")),
+            };
+        }
     }
 }