From a9c8f9c49e64d0d2ddeb2be57008cfcb7af7aa29 Mon Sep 17 00:00:00 2001
From: Felix Becker <felix.b@outlook.com>
Date: Fri, 30 Sep 2016 10:39:09 +0200
Subject: [PATCH] Improve exception in ProtocolStreamWriter::write()

---
 src/ProtocolStreamWriter.php | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/ProtocolStreamWriter.php b/src/ProtocolStreamWriter.php
index d32a9d3..2ac3579 100644
--- a/src/ProtocolStreamWriter.php
+++ b/src/ProtocolStreamWriter.php
@@ -4,6 +4,7 @@ declare(strict_types = 1);
 namespace LanguageServer;
 
 use LanguageServer\Protocol\Message;
+use RuntimeException;
 
 class ProtocolStreamWriter implements ProtocolWriter
 {
@@ -30,9 +31,15 @@ class ProtocolStreamWriter implements ProtocolWriter
         $totalBytesWritten = 0;
 
         while ($totalBytesWritten < $msgSize) {
+            error_clear_last();
             $bytesWritten = @fwrite($this->output, substr($data, $totalBytesWritten));
             if ($bytesWritten === false) {
-                throw new Exception('Could not write message.');
+                $error = error_get_last();
+                if ($error !== null) {
+                    throw new RuntimeException('Could not write message: ' . error_get_last()['message']);
+                } else {
+                    throw new RuntimeException('Could not write message');
+                }
             }
             $totalBytesWritten += $bytesWritten;
         }