Where goes the console output of X programs?

[Carlos Rodrigues]

Hi!

Where does the output that X programs dump in the console? I do not have 
an .xsession-errors file or anything...

Carlos Rodrigues

[Tom Mitchell]

On Thu, Sep 30, 2004 at 10:51:27PM +0100, Carlos Rodrigues wrote:
> Where does the output that X programs dump in the console? I do not have 
> an .xsession-errors file or anything...

It can be different for each process.

Look at /proc/NNNN for the process of interest.

Since the first three file are standard in (0), out (1), err (2)

$ ls -l /proc/26670/fd
    total 8
    lr-x------  1 mitch mitch 64 Sep 30 16:36 0 -> /dev/null
    l-wx------  1 mitch mitch 64 Sep 30 16:36 1 -> pipe:[14054]
    l-wx------  1 mitch mitch 64 Sep 30 16:36 2 -> pipe:[14054]
    lrwx------  1 mitch mitch 64 Sep 30 16:36 3 -> socket:[203653]

So in this case the out and err are tossed into a FIFO
that is not inspected.  Use "lsof" to see what plays with the pipe...

[Tom Mitchell]

On Thu, Sep 30, 2004 at 04:50:39PM -0700, Nifty Hat Mitch wrote:
> Date: Thu, 30 Sep 2004 16:50:39 -0700
> From: Nifty Hat Mitch 
> To: For users of Fedora Core releases 
> Mail-Followup-To: Nifty Hat Mitch ,
>    For users of Fedora Core releases 
> Subject: Re: Where goes the console output of X programs?
> Reply-To: For users of Fedora Core releases
>
> On Thu, Sep 30, 2004 at 10:51:27PM +0100, Carlos Rodrigues wrote:
> > Where does the output that X programs dump in the console? I do not have 
> > an .xsession-errors file or anything...
>
> It can be different for each process.
>
> Look at /proc/NNNN for the process of interest.
>
> Since the first three file are standard in (0), out (1), err (2)
> $ ls -l /proc/26670/fd
> total 8
> lr-x------  1 mitch mitch 64 Sep 30 16:36 0 -> /dev/null
> l-wx------  1 mitch mitch 64 Sep 30 16:36 1 -> pipe:[14054]
> l-wx------  1 mitch mitch 64 Sep 30 16:36 2 -> pipe:[14054]
> lrwx------  1 mitch mitch 64 Sep 30 16:36 3 -> socket:[203653]
>
> So in this case the out and err are tossed into a FIFO
> that is not inspected.  Use "lsof" to see what plays with the pipe...

BTW if the "Run in terminal" box is check (see right mouse --> properties)
for a desktop icon the console/terminal output has a place to go and
be observed.  Useful for debugging....

[Carlos Rodrigues]

Nifty Hat Mitch wrote:
> On Thu, Sep 30, 2004 at 10:51:27PM +0100, Carlos Rodrigues wrote:
> > Where does the output that X programs dump in the console? I do not have 
> > an .xsession-errors file or anything...
>
> It can be different for each process.
>
> Look at /proc/NNNN for the process of interest.
>
> Since the first three file are standard in (0), out (1), err (2)
> $ ls -l /proc/26670/fd
> total 8
> lr-x------  1 mitch mitch 64 Sep 30 16:36 0 -> /dev/null
> l-wx------  1 mitch mitch 64 Sep 30 16:36 1 -> pipe:[14054]
> l-wx------  1 mitch mitch 64 Sep 30 16:36 2 -> pipe:[14054]
> lrwx------  1 mitch mitch 64 Sep 30 16:36 3 -> socket:[203653]
>
> So in this case the out and err are tossed into a FIFO
> that is not inspected.  Use "lsof" to see what plays with the pipe...

Well, I was hoping of a more general solution, like having a log of 
everything that any X client dumps to the console on a given session (a 
/var/log/messages alike for X).

If X crashes I just can't go out and grab some client's console... (I 
don't even know the culprit then).

Carlos Rodrigues

[Carlos Rodrigues]

Carlos Rodrigues wrote:
> Well, I was hoping of a more general solution, like having a log of 
> everything that any X client dumps to the console on a given session (a 
> /var/log/messages alike for X).
>
> If X crashes I just can't go out and grab some client's console... (I 
> don't even know the culprit then).

I founf it out, GDM redirects the output to 
"/tmp/xses-${USER}.${SOME_RANDOM_CHARS}"

Carlos Rodrigues