From 1f17b40d0031ff960326c6fbd6d8e277f9356560 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Thu, 6 Jun 2019 10:41:24 +0200
Subject: [PATCH] FIFO: Let write() fail with EPIPE if there's no reader.

---
 Kernel/FileSystem/FIFO.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Kernel/FileSystem/FIFO.cpp b/Kernel/FileSystem/FIFO.cpp
index 5851b53ecd..261a3d2d9d 100644
--- a/Kernel/FileSystem/FIFO.cpp
+++ b/Kernel/FileSystem/FIFO.cpp
@@ -88,7 +88,7 @@ bool FIFO::can_read(FileDescriptor&) const
 
 bool FIFO::can_write(FileDescriptor&) const
 {
-    return m_buffer.bytes_in_write_buffer() < 4096;
+    return m_buffer.bytes_in_write_buffer() < 4096 || !m_readers;
 }
 
 ssize_t FIFO::read(FileDescriptor&, byte* buffer, ssize_t size)
@@ -108,7 +108,7 @@ ssize_t FIFO::read(FileDescriptor&, byte* buffer, ssize_t size)
 ssize_t FIFO::write(FileDescriptor&, const byte* buffer, ssize_t size)
 {
     if (!m_readers)
-        return 0;
+        return -EPIPE;
 #ifdef FIFO_DEBUG
     dbgprintf("fifo: write(%p, %u)\n", buffer, size);
 #endif