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<== Date ==> <== Thread ==>
Subject: Re: Stopping IOC boot on failure to load database
From: Michael Davidsaver via Tech-talk <[email protected]>
To: Ralph Lange <[email protected]>
Cc: EPICS Tech Talk <[email protected]>
Date: Mon, 29 Apr 2019 09:01:43 -0700 
On 4/29/19 8:32 AM, Ralph Lange via Tech-talk wrote:
> 
> 
> On Mon, 29 Apr 2019 at 17:02, Johnson, Andrew N. via Tech-talk <[email protected] <mailto:[email protected]>> wrote:
> 
> 
>     We might be able to add a routine to iocsh that replicates the VxWorks shellScriptAbort() routine; calling that aborts the current VxWorks target shell and stops reading the startup script. I haven't studied how it works on VxWorks, but my guess is that on entry the shell calls setjmp(), and the abort routine calls longjmp() to return to that context again and clean up. I could see that as a possible cause of lost resources if we're not careful though.
> 
> 
> Sounds dangerous...
> I would rather have a new API for the shell commands (allowing return codes) and a glue layer for the existing (old API) commands that returns 0 in the new API.

The registration/call API certainly could use improvement (cf. my previous mail about pv/iocshelper.h).

A less invasive, and more flexible, approach would use a thread local to allow
knowledgeable functions to set a return value, and maybe a message.  This would
probably be wrapped in a function.

Something like 'iocshSetError(long code, const char* msg)'.

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References:
Stopping IOC boot on failure to load database Paduan Donadio, Marcio via Tech-talk
Re: Stopping IOC boot on failure to load database Benjamin Franksen via Tech-talk
Re: Stopping IOC boot on failure to load database Ralph Lange via Tech-talk
Re: Stopping IOC boot on failure to load database Johnson, Andrew N. via Tech-talk
Re: Stopping IOC boot on failure to load database Ralph Lange via Tech-talk
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