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Re: [BUG] RETURN trap with -o functrace: infinite recursion on 'eval return'

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  Re: [BUG] RETURN trap with -o functrace: infinite recursion on 'eval return' Martijn Dekker <martijn@inlv.org> - 2018-04-14 05:29 +0200

#14048 — Re: [BUG] RETURN trap with -o functrace: infinite recursion on 'eval return'

Op 14-04-18 om 03:49 schreef Chet Ramey:
> On 4/10/18 5:56 AM, Martijn Dekker wrote:
>> It seems odd that the RETURN trap would be triggered while a RETURN trap
>> action is still being executed. Might it be better to temporarily
>> deactivate the effect of '-o functrace' while a RETURN trap action is being
>> executed?
> 
> Well, trap handlers are recursive, in the sense that you can execute a trap
> on signal X from a signal X trap handler.

I'm not sure how that would happen. Isn't a signal blocked while 
executing its trap handler?

>  If the RETURN trap is inherited
> by functions, and traps are recursive, wouldn't the bash behavior be the
> logical thing to do?

I suppose. But if a signal is blocked while executing the respective 
trap, perhaps it would also be logical to deactivate the RETURN 
pseudosignal while executing a RETURN trap.

It seems like this is already done for the ERR pseudosignal, as "trap 
false ERR; false" does not cause an infinite loop.

- M.

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