Experimental Physics and
Industrial Control System

Eric Norum <[email protected]> · Thu, 17 Jul 2008 18:30:19 -0500

On Jul 17, 2008, at 5:25 PM, J. Lewis Muir wrote:
On 7/17/08 9:31 AM, Mark Rivers wrote:

I’ve done some more investigation of this. It appears that stdout is

being closed and re-opened when the vxWorks startup script completes.

Does anyone know if this is true? If so, I don’t understand why. I

can understand why stdin may be reopened, changing from the startup

script to the console. But why stdout? Is there a way to open a
file

descriptor to the console that will not be closed and re-opened
when the

startup script completes?

Hi, Mark.
I looked at src/iocsh/iocsh.cpp in EPICS base 3.14.9 and it seems to
be

doing some special things with (FILE *) references to support

redirection. Maybe this is causing the problem? The comment in the

file indicates the original author was Marty Kraimer and that it was

modified by Eric Norum a little later.

Not an issue.
Mark isn't using iocsh.
There are about four places in the file where fclose() is called on a

(FILE *) reference. You could add a print statement before these to
see

if this is indeed where stdout is getting closed.
But I bet Marty or Eric know better.

--
Eric Norum <[email protected]>
Advanced Photon Source
Argonne National Laboratory
(630) 252-4793