From 1e58e8729a0a73117bbfa533f0a498ffb3e228f6 Mon Sep 17 00:00:00 2001
From: puddly <32534428+puddly@users.noreply.github.com>
Date: Wed, 6 May 2026 14:53:48 -0400
Subject: [PATCH] [uart] Use `tcdrain` for flushing instead of`tcflush` on host
 (#14877)

Co-authored-by: Jonathan Swoboda <154711427+swoboda1337@users.noreply.github.com>
---
 esphome/components/uart/uart_component_host.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/esphome/components/uart/uart_component_host.cpp b/esphome/components/uart/uart_component_host.cpp
index 085610a983..5bb7a49726 100644
--- a/esphome/components/uart/uart_component_host.cpp
+++ b/esphome/components/uart/uart_component_host.cpp
@@ -276,9 +276,12 @@ UARTFlushResult HostUartComponent::flush() {
   if (this->file_descriptor_ == -1) {
     return UARTFlushResult::UART_FLUSH_RESULT_ASSUMED_SUCCESS;
   }
-  tcflush(this->file_descriptor_, TCIOFLUSH);
   ESP_LOGV(TAG, "    Flushing");
-  return UARTFlushResult::UART_FLUSH_RESULT_ASSUMED_SUCCESS;
+  if (tcdrain(this->file_descriptor_) == -1) {
+    this->update_error_(strerror(errno));
+    return UARTFlushResult::UART_FLUSH_RESULT_FAILED;
+  }
+  return UARTFlushResult::UART_FLUSH_RESULT_SUCCESS;
 }
 
 void HostUartComponent::update_error_(const std::string &error) {