From 6064fa6fed5a56740ec97ee5a0cea09df3fe9d84 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sat, 21 Mar 2026 10:54:49 +0000
Subject: [PATCH 1/2] Initial plan


From 2395918b5220d4678758f672bd7c7fedd7fc5af4 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sat, 21 Mar 2026 10:57:37 +0000
Subject: [PATCH 2/2] Fix mp_hal_stdout_tx_strn(): use ssize_t, loop for
 partial writes, handle EINTR

Co-authored-by: morita5840 <27051616+morita5840@users.noreply.github.com>
Agent-Logs-Url: https://github.com/ETrobocon/pybricks-micropython/sessions/47be6172-8e95-4d8b-bd62-96efebdf1c34
---
 bricks/ev3dev/ev3dev_mphal.c | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/bricks/ev3dev/ev3dev_mphal.c b/bricks/ev3dev/ev3dev_mphal.c
index c3fa7b5e5..e4ac74983 100644
--- a/bricks/ev3dev/ev3dev_mphal.c
+++ b/bricks/ev3dev/ev3dev_mphal.c
@@ -110,10 +110,25 @@ int mp_hal_stdin_rx_chr(void) {
 }
 
 mp_uint_t mp_hal_stdout_tx_strn(const char *str, size_t len) {
-    MP_THREAD_GIL_EXIT();
-    int ret = write(STDOUT_FILENO, str, len);
-    MP_THREAD_GIL_ENTER();
-    return ret < 0 ? 0 : ret;
+    size_t remaining = len;
+    while (remaining > 0) {
+        MP_THREAD_GIL_EXIT();
+        ssize_t ret = write(STDOUT_FILENO, str, remaining);
+        MP_THREAD_GIL_ENTER();
+        if (ret < 0) {
+            if (errno == EINTR) {
+                continue;
+            }
+            return len - remaining;
+        }
+        /* Defensive check: POSIX guarantees ret <= remaining, but guard against non-compliant implementations. */
+        if ((size_t)ret > remaining) {
+            return len;
+        }
+        str += ret;
+        remaining -= (size_t)ret;
+    }
+    return len;
 }
 
 // cooked is same as uncooked because the terminal does some postprocessing