Re: Invalid signal used with trap causes dash to abort

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

On Wed, Feb 24, 2010 at 10:23:34AM +0000, Peter Kjellerstedt wrote:
> Hi,
> 
> there seems to be a problem  with the trap implementation in dash
> (tested with 0.5.4 and 0.5.5.1). If I specify a signal which is not 
> supported, the shell unconditionally aborts. E.g., I had expected
> the following to print foo (like bash and zsh do):
> 
> # dash -c 'trap "echo trap executed" UNKNOWNSIGNAL || echo "foo"'
> trap: 1: UNKNOWNSIGNAL: bad trap
> 
> This means I cannot write a construct like the following to take 
> advantage of the ERR signal which is present in some shells:
> 
> trap "echo ERR trap executed" ERR 2>/dev/null || :
> 
> I also checked the POSIX documentation, and quoting from
> http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
> (exit status): "For both interactive and non-interactive shells, 
> invalid signal names [XSI] [Option Start] or numbers [Option End] 
> shall not be considered a syntax error and do not cause the shell 
> to abort."

I'll look into this.

Thanks,
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Email: Herbert Xu ~{PmV>HI~} <herbert@xxxxxxxxxxxxxxxxxxx>
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