[Mono-bugs] [Bug 676099] New: Process.StartInfo.Arguments does not pass empty string to child process correctly

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Tue Mar 1 18:01:01 EST 2011



           Summary: Process.StartInfo.Arguments does not pass empty string
                    to child process correctly
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.10.x
          Platform: x86-64
        OS/Version: Ubuntu
            Status: NEW
          Severity: Major
          Priority: P5 - None
         Component: System
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: bryan.murphy at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---

User-Agent:       Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b12) Gecko/20100101

System.Diagnostics.Process does not appear to be passing the correct command
line parameters to a child process.  The same command works successfully from
the command line.

The command I am trying to invoke is the following:

segmenter input.ts 10 output.m3u8 output.m3u8 ""

The last argument to this tool is a required parameter, but I need to pass an
empty string.

When I execute the command manually via the command line, I get the following
output (which is correct):

[mpegts @ 0x18520e0] max_analyze_duration reached
Output #0, mpegts, to 'output.m3u8':
    Stream #0.0: Video: libx264, yuv420p, 640x368, q=2-31, 90k tbn, 29.97 tbc
    Stream #0.1: Audio: libfaac, 48000 Hz, stereo, 69 kb/s
[mpegts @ 0x1858790] muxrate VBR, pcr every 5 pkts, sdt every 200, pat/pmt
every 40 pkts

When I execute the command using a simple test wrapper I wrote in C#, I get the
following output (which is incorrect):

EXEC: segmenter input.ts 10 output.m3u8 output.m3u8 ""
Usage: /usr/local/bin/segmenter <input MPEG-TS file> <segment duration in
seconds> <output MPEG-TS file prefix> <output m3u8 index file> <http prefix>
[<segment window size>] [<search kill file>]

Compiled by Daniel Espendiller - www.espend.de
build on Feb 28 2011 17:47:31 with 4.4.3

Took some code from:
 - source:http://svn.assembla.com/svn/legend/segmenter/
Exit Code: 1

Mono appears to not pass the empty string correctly.  I am currently running
mono 2.10.1:

mono --version
Mono JIT compiler version 2.10.1 (tarball Mon Feb 28 18:03:41 UTC 2011)
Copyright (C) 2002-2011 Novell, Inc and Contributors. www.mono-project.com
        TLS:           __thread
        SIGSEGV:       altstack
        Notifications: epoll
        Architecture:  amd64
        Disabled:      none
        Misc:          softdebug
        LLVM:          supported, not enabled.
        GC:            Included Boehm (with typed GC and Parallel Mark)

I have not tried my test code against an older version of the mono framework,
however, we have been using this tool in our production environment for many
months now without a problem using mono 2.6.x.

My test app is below:

using System;
using System.Diagnostics;

class Program
    public static void Main(string[] args)
        using (var process = new Process())
            process.StartInfo.FileName = "segmenter";
            process.StartInfo.Arguments = @"input.ts 10 output.m3u8 output.m3u8
            process.StartInfo.CreateNoWindow = true;
            process.StartInfo.LoadUserProfile = false;
            process.StartInfo.UseShellExecute = false;
            process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;

            Console.Out.WriteLine("EXEC: {0} {1}", process.StartInfo.FileName,

            Console.Out.WriteLine("Exit Code: " + process.ExitCode);

Reproducible: Always

Steps to Reproduce:
Run my test code against the segmenter application (or any application that has
a required parameter that you want to pass an empty string to).

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