Allow character devices to block write attempts until there is more space.

1 files changed, 5 insertions, 0 deletions

diff --git a/Kernel/MasterPTY.cpp b/Kernel/MasterPTY.cpp
index 2894839bc1..13eb54ace6 100644
--- a/Kernel/MasterPTY.cpp
+++ b/Kernel/MasterPTY.cpp
@@ -36,6 +36,11 @@ bool MasterPTY::has_data_available_for_reading(Process&) const
     return !m_buffer.is_empty();
 }
 
+bool MasterPTY::can_write(Process&) const
+{
+    return m_buffer.bytes_in_write_buffer() < 4096;
+}
+
 void MasterPTY::on_slave_write(const byte* data, size_t size)
 {
     m_buffer.write(data, size);