Use Environment.SystemPageSize to set desireBufferSize (#40247)

PAGE_SIZE is not all 4096 for all architecture, so we can get it by Environment.SystemPageSize

Co-authored-by: Sunguoyun <sunguoyun@loongson.cn>

diff --git a/src/libraries/System.IO.Pipes/tests/AnonymousPipeTests/AnonymousPipeTest.Specific.cs b/src/libraries/System.IO.Pipes/tests/AnonymousPipeTests/AnonymousPipeTest.Specific.cs
index 4dd1018..f7ef3d6 100644 (file)
--- a/src/libraries/System.IO.Pipes/tests/AnonymousPipeTests/AnonymousPipeTest.Specific.cs
+++ b/src/libraries/System.IO.Pipes/tests/AnonymousPipeTests/AnonymousPipeTest.Specific.cs
@@ -85,7 +85,7 @@ namespace System.IO.Pipes.Tests
             // On Linux, setting the buffer size of the server will also set the buffer size of the
             // client, regardless of the direction of the flow
 
-            int desiredBufferSize = 4096;
+            int desiredBufferSize = Environment.SystemPageSize;
             using (var server = new AnonymousPipeServerStream(PipeDirection.Out, HandleInheritability.None, desiredBufferSize))
             {
                 Assert.Equal(desiredBufferSize, server.OutBufferSize);