From 40e0f4af986426681e01f9c81e2194db985ad5d3 Mon Sep 17 00:00:00 2001
From: "rpotts%netscape.com" <rpotts%netscape.com>
Date: Fri, 11 Jun 1999 08:25:57 +0000
Subject: [PATCH] if no more data is available when reading a non-blocking
 input stream then return either WOULD_BLOCK or NS_OK...  But exit the loop to
 prevent spinning!

---
 xpcom/io/nsPipe.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/xpcom/io/nsPipe.cpp b/xpcom/io/nsPipe.cpp
index 3541b36e0047..0972735fea13 100644
--- a/xpcom/io/nsPipe.cpp
+++ b/xpcom/io/nsPipe.cpp
@@ -174,6 +174,10 @@ nsBufferInputStream::Read(char* aBuf, PRUint32 aCount, PRUint32 *aReadCount)
         if (amt == 0) {
             rv = Fill();
             if (NS_FAILED(rv)) return rv;
+            if (!mBlocking) {
+                // Only return WOULD_BLOCK if no data was read...
+                return *aReadCount > 0 ? NS_OK : rv;
+            }
         }
         else {
             *aReadCount += amt;