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<== Date ==> <== Thread ==>

Subject: Re: Handling failures in st.cmd
From: Benjamin Franksen <benjamin.franksen@helmholtz-berlin.de>
To: <tech-talk@aps.anl.gov>
Date: Fri, 13 May 2011 02:31:28 +0200
Am Freitag, 13. Mai 2011, um 02:07:20 schrieb Ernest L. Williams Jr.:
> Till Straumann wrote:
> > On 05/12/2011 05:22 PM, Zelazny, Michael Stanley wrote:
> >> If, for example, dbLoadRecords, initializing some hardware module,
> >> cd("some/dir"), etc. fails while an IOC is booting, is there any way to
> >> trap this in my st.cmd and take an action, such as abort the IOC boot?
> >
> > Under RTEMS (cexpsh shell -- every line is a C expression)
> > you can easily do that (provided that the routine you want to trap
> > returns a status)
> >
> > dbLoadRecords(...) && bsp_reset()
> >
> > will reset the board if dbLoadRecords() returns
> > a non-zero value.
> >
> > However, rebooting is maybe not the best way to
> > handle this since you will most likely end up in
> > an endless loop (since the error condition doesn't
> > go away with a reboot).
>
> What we really want is for the whole process to just stop.
> For example, in RTEMS if there is an undefined symbol the system errors
> out and stops.
> Or is that vxWorks, I am thinking of?

If I remember correctly,  I have once done this for VxWorks by calling
exit(EXIT_FAILURE). This will abort the shell task and the boot process stops.
It will, however, not stop other tasks that have aleady been started, so is
useful only until shortly before iocInit completes.

Cheers
Ben

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Replies:
Re: Handling failures in st.cmd Till Straumann
References:
Handling failures in st.cmd Zelazny, Michael Stanley
Re: Handling failures in st.cmd Till Straumann
Re: Handling failures in st.cmd Ernest L. Williams Jr.

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