From 071ff801eebdc5e7c0b4acfd861cceead5174336 Mon Sep 17 00:00:00 2001
From: Augustin Cavalier <waddlesplash@gmail.com>
Date: Tue, 9 May 2023 16:53:23 -0400
Subject: [PATCH] BSerialPort: Implement WaitForInput() using wait_for_objects.

Fixes #17867.

Change-Id: Ib59781128d5d21317c4042f250333b177a0ed91b
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6432
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
---
 src/kits/device/SerialPort.cpp | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/src/kits/device/SerialPort.cpp b/src/kits/device/SerialPort.cpp
index 37f4c36063..b84899d4d1 100644
--- a/src/kits/device/SerialPort.cpp
+++ b/src/kits/device/SerialPort.cpp
@@ -17,6 +17,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <sys/ioctl.h>
 #include <termios.h>
 
 
@@ -469,10 +470,18 @@ BSerialPort::IsDCD(void)
 ssize_t
 BSerialPort::WaitForInput(void)
 {
-	ssize_t size;
-	int err = ioctl(ffd, TCWAITEVENT, &size, sizeof size);
+	object_wait_info info[1];
+	info[0].type = B_OBJECT_TYPE_FD;
+	info[0].object = ffd;
+	info[0].events = B_EVENT_READ | B_EVENT_ERROR | B_EVENT_DISCONNECTED;
+	status_t status = wait_for_objects_etc(info, 1, B_RELATIVE_TIMEOUT, fTimeout);
+	if (status < 0)
+		return status;
 
-	return (err < B_OK) ? errno : size;
+	int size;
+	if (ioctl(ffd, FIONREAD, &size, sizeof(size)) < 0)
+		return errno;
+	return size;
 }