[Mono-bugs] [Bug 401225] New: Process.StandardOutput is buffering process output

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Wed Jun 18 06:51:13 EDT 2008


           Summary: Process.StandardOutput is buffering process output
           Product: Mono: Class Libraries
           Version: SVN
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: System
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: lluis at novell.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---

Try the following test case:

using System;
using System.Diagnostics;

public class Test
        public static void Main (string[] args)
                if (args.Length == 0) {
                        Process proc = new Process ();
                        proc.StartInfo.FileName = "mono";
                        proc.StartInfo.Arguments =
typeof(Test).Assembly.Location + " x";
                        proc.StartInfo.UseShellExecute = false;
                        proc.StartInfo.RedirectStandardInput = true;
                        proc.StartInfo.RedirectStandardOutput = true;
                        proc.Start ();

                        // This call should read the whole line, but it is
blocking in the middle
                        proc.StandardOutput.ReadLine ();
                else {
                        Console.WriteLine (new string ('h', 10000));
                        Console.ReadLine ();

In this example one process reads tries to read a line of text from the output
of another process. The line is fully written by the other process, but the
main process is blocked waiting for a buffer to fill, and it never exits.

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