From 995a5af660ba3d3440cbcb5075e47d66aff2bf5d Mon Sep 17 00:00:00 2001
From: Pavel Vymetálek <pavel@vym.cz>
Date: Tue, 3 Nov 2026 09:36:20 +0100
Subject: Non-blocking read during flush serial port, thanks to Lordcoxis

---
 sercp.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'sercp.c')

diff --git a/sercp.c b/sercp.c
index d25af14..bbb607b 100644
--- a/sercp.c
+++ b/sercp.c
@@ -335,11 +335,16 @@ void FlushSerialPort() {
 			len = (size_t) ulNumBytes;
 		} while (len > 1);
 #else
+		// the port is blocking on __APPLE__ (see OpenUart): read without waiting, or this
+		// hangs until the other side sends something
+		int flags = fcntl(serial_fd, F_GETFL);
+		fcntl(serial_fd, F_SETFL, flags | O_NONBLOCK);
 		tcflush(serial_fd, TCIOFLUSH);
 		do {
 			sleep_ms(100);
 			len = read (serial_fd, p_buff, 100);
 		} while (len > 1);
+		fcntl(serial_fd, F_SETFL, flags);
 #endif
 	}
 	if (is_osc_progress_supported) {
-- 
cgit