[Mono-osx] Error with "psn" command line option for .app on OS X

Michael Hutchinson m.j.hutchinson at gmail.com
Sun Sep 26 12:25:09 EDT 2010

On Tue, Sep 21, 2010 at 5:26 AM, stevenspencer
<stevenspencer01 at gmail.com> wrote:
> I have an intermittent problem. I have a mono application as a .app bundle on
> my desktop.
> Occasionally, double-clicking the .app has no effect. You see the icon
> effect (the icon increases in size and fades out), but the application never
> launches.
> Looking in the Console, the line
>      Unknown command line option '-psn_0_548998'
> appears for my application. This is what is seen on the command line if one
> types "mono -psn_0_548998 appname". Typing "mono appname -psn_0_548998" has
> no issues since the command line option gets passed through to my
> application.
> It appears that the launchd app of the OS is adding this extra option and
> passing it through to mono. Although, given that the problem is
> intermittent, it does not do this every time. When the application works,
> one can see, from doing a "ps agux", that my application does not have a
> "-psn..." option on its command line whereas other running applications,
> such as iTunes, do have the option.
> After googling around for this, there is very little information. The -psn
> option is for the OS X process id, but that's about as much as I can find.
> Has anybody else seen such an intermittent problem? I am running OS X 10.6.4
> and Mono 2.6.4

What does your launch script look like?

Michael Hutchinson

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