From 8f4fba95c0f39992cc1aac046a4a0c9804e0a3b4 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Sat, 27 Jul 2019 10:47:46 +0200
Subject: [PATCH] CIODevice: Add a virtual did_update_fd() no notify subclasses
 of fd change.

This will allow subclasses to react when the file descriptor changes.
---
 Libraries/LibCore/CIODevice.cpp | 9 +++++++++
 Libraries/LibCore/CIODevice.h   | 4 +++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Libraries/LibCore/CIODevice.cpp b/Libraries/LibCore/CIODevice.cpp
index 394050d9a0..edfe7ba3c5 100644
--- a/Libraries/LibCore/CIODevice.cpp
+++ b/Libraries/LibCore/CIODevice.cpp
@@ -241,3 +241,12 @@ int CIODevice::printf(const char* format, ...)
     va_end(ap);
     return ret;
 }
+
+void CIODevice::set_fd(int fd)
+{
+    if (m_fd == fd)
+        return;
+
+    m_fd = fd;
+    did_update_fd(fd);
+}
diff --git a/Libraries/LibCore/CIODevice.h b/Libraries/LibCore/CIODevice.h
index 1c8dac5831..2af344542c 100644
--- a/Libraries/LibCore/CIODevice.h
+++ b/Libraries/LibCore/CIODevice.h
@@ -56,11 +56,13 @@ public:
 protected:
     explicit CIODevice(CObject* parent = nullptr);
 
-    void set_fd(int fd) { m_fd = fd; }
+    void set_fd(int);
     void set_mode(OpenMode mode) { m_mode = mode; }
     void set_error(int error) { m_error = error; }
     void set_eof(bool eof) { m_eof = eof; }
 
+    virtual void did_update_fd(int) {}
+
 private:
     bool populate_read_buffer();
     bool can_read_from_fd() const;